Blanket copy of PhoneApp to services/Telephony.

First phase of splitting out InCallUI from PhoneApp.

Change-Id: I237341c4ff00e96c677caa4580b251ef3432931b
diff --git a/src/com/android/phone/CallFeaturesSetting.java b/src/com/android/phone/CallFeaturesSetting.java
new file mode 100644
index 0000000..1848e54
--- /dev/null
+++ b/src/com/android/phone/CallFeaturesSetting.java
@@ -0,0 +1,2205 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.phone;
+
+import android.app.ActionBar;
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.app.ProgressDialog;
+import android.content.ContentResolver;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.content.SharedPreferences;
+import android.content.SharedPreferences.Editor;
+import android.content.pm.ActivityInfo;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
+import android.database.Cursor;
+import android.database.sqlite.SQLiteException;
+import android.media.AudioManager;
+import android.media.RingtoneManager;
+import android.net.Uri;
+import android.net.sip.SipManager;
+import android.os.AsyncResult;
+import android.os.Bundle;
+import android.os.Handler;
+import android.os.Message;
+import android.os.UserHandle;
+import android.os.Vibrator;
+import android.preference.CheckBoxPreference;
+import android.preference.ListPreference;
+import android.preference.Preference;
+import android.preference.PreferenceActivity;
+import android.preference.PreferenceGroup;
+import android.preference.PreferenceManager;
+import android.preference.PreferenceScreen;
+import android.provider.ContactsContract.CommonDataKinds;
+import android.provider.MediaStore;
+import android.provider.Settings;
+import android.provider.Settings.SettingNotFoundException;
+import android.telephony.PhoneNumberUtils;
+import android.text.TextUtils;
+import android.util.Log;
+import android.view.MenuItem;
+import android.view.WindowManager;
+import android.widget.ListAdapter;
+
+import com.android.internal.telephony.CallForwardInfo;
+import com.android.internal.telephony.CommandsInterface;
+import com.android.internal.telephony.Phone;
+import com.android.internal.telephony.PhoneConstants;
+import com.android.internal.telephony.cdma.TtyIntent;
+import com.android.phone.sip.SipSharedPreferences;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Top level "Call settings" UI; see res/xml/call_feature_setting.xml
+ *
+ * This preference screen is the root of the "Call settings" hierarchy
+ * available from the Phone app; the settings here let you control various
+ * features related to phone calls (including voicemail settings, SIP
+ * settings, the "Respond via SMS" feature, and others.)  It's used only
+ * on voice-capable phone devices.
+ *
+ * Note that this activity is part of the package com.android.phone, even
+ * though you reach it from the "Phone" app (i.e. DialtactsActivity) which
+ * is from the package com.android.contacts.
+ *
+ * For the "Mobile network settings" screen under the main Settings app,
+ * See {@link MobileNetworkSettings}.
+ *
+ * @see com.android.phone.MobileNetworkSettings
+ */
+public class CallFeaturesSetting extends PreferenceActivity
+        implements DialogInterface.OnClickListener,
+        Preference.OnPreferenceChangeListener,
+        EditPhoneNumberPreference.OnDialogClosedListener,
+        EditPhoneNumberPreference.GetDefaultNumberListener{
+    private static final String LOG_TAG = "CallFeaturesSetting";
+    private static final boolean DBG = (PhoneGlobals.DBG_LEVEL >= 2);
+
+    /**
+     * Intent action to bring up Voicemail Provider settings.
+     *
+     * @see #IGNORE_PROVIDER_EXTRA
+     */
+    public static final String ACTION_ADD_VOICEMAIL =
+            "com.android.phone.CallFeaturesSetting.ADD_VOICEMAIL";
+    // intent action sent by this activity to a voice mail provider
+    // to trigger its configuration UI
+    public static final String ACTION_CONFIGURE_VOICEMAIL =
+            "com.android.phone.CallFeaturesSetting.CONFIGURE_VOICEMAIL";
+    // Extra put in the return from VM provider config containing voicemail number to set
+    public static final String VM_NUMBER_EXTRA = "com.android.phone.VoicemailNumber";
+    // Extra put in the return from VM provider config containing call forwarding number to set
+    public static final String FWD_NUMBER_EXTRA = "com.android.phone.ForwardingNumber";
+    // Extra put in the return from VM provider config containing call forwarding number to set
+    public static final String FWD_NUMBER_TIME_EXTRA = "com.android.phone.ForwardingNumberTime";
+    // If the VM provider returns non null value in this extra we will force the user to
+    // choose another VM provider
+    public static final String SIGNOUT_EXTRA = "com.android.phone.Signout";
+    //Information about logical "up" Activity
+    private static final String UP_ACTIVITY_PACKAGE = "com.android.dialer";
+    private static final String UP_ACTIVITY_CLASS =
+            "com.android.dialer.DialtactsActivity";
+
+    // Used to tell the saving logic to leave forwarding number as is
+    public static final CallForwardInfo[] FWD_SETTINGS_DONT_TOUCH = null;
+    // Suffix appended to provider key for storing vm number
+    public static final String VM_NUMBER_TAG = "#VMNumber";
+    // Suffix appended to provider key for storing forwarding settings
+    public static final String FWD_SETTINGS_TAG = "#FWDSettings";
+    // Suffix appended to forward settings key for storing length of settings array
+    public static final String FWD_SETTINGS_LENGTH_TAG = "#Length";
+    // Suffix appended to forward settings key for storing an individual setting
+    public static final String FWD_SETTING_TAG = "#Setting";
+    // Suffixes appended to forward setting key for storing an individual setting properties
+    public static final String FWD_SETTING_STATUS = "#Status";
+    public static final String FWD_SETTING_REASON = "#Reason";
+    public static final String FWD_SETTING_NUMBER = "#Number";
+    public static final String FWD_SETTING_TIME = "#Time";
+
+    // Key identifying the default vocie mail provider
+    public static final String DEFAULT_VM_PROVIDER_KEY = "";
+
+    /**
+     * String Extra put into ACTION_ADD_VOICEMAIL call to indicate which provider should be hidden
+     * in the list of providers presented to the user. This allows a provider which is being
+     * disabled (e.g. GV user logging out) to force the user to pick some other provider.
+     */
+    public static final String IGNORE_PROVIDER_EXTRA = "com.android.phone.ProviderToIgnore";
+
+    // string constants
+    private static final String NUM_PROJECTION[] = {CommonDataKinds.Phone.NUMBER};
+
+    // String keys for preference lookup
+    // TODO: Naming these "BUTTON_*" is confusing since they're not actually buttons(!)
+    private static final String BUTTON_VOICEMAIL_KEY = "button_voicemail_key";
+    private static final String BUTTON_VOICEMAIL_PROVIDER_KEY = "button_voicemail_provider_key";
+    private static final String BUTTON_VOICEMAIL_SETTING_KEY = "button_voicemail_setting_key";
+    // New preference key for voicemail notification vibration
+    /* package */ static final String BUTTON_VOICEMAIL_NOTIFICATION_VIBRATE_KEY =
+            "button_voicemail_notification_vibrate_key";
+    // Old preference key for voicemail notification vibration. Used for migration to the new
+    // preference key only.
+    /* package */ static final String BUTTON_VOICEMAIL_NOTIFICATION_VIBRATE_WHEN_KEY =
+            "button_voicemail_notification_vibrate_when_key";
+    /* package */ static final String BUTTON_VOICEMAIL_NOTIFICATION_RINGTONE_KEY =
+            "button_voicemail_notification_ringtone_key";
+    private static final String BUTTON_FDN_KEY   = "button_fdn_key";
+    private static final String BUTTON_RESPOND_VIA_SMS_KEY   = "button_respond_via_sms_key";
+
+    private static final String BUTTON_RINGTONE_KEY    = "button_ringtone_key";
+    private static final String BUTTON_VIBRATE_ON_RING = "button_vibrate_on_ring";
+    private static final String BUTTON_PLAY_DTMF_TONE  = "button_play_dtmf_tone";
+    private static final String BUTTON_DTMF_KEY        = "button_dtmf_settings";
+    private static final String BUTTON_RETRY_KEY       = "button_auto_retry_key";
+    private static final String BUTTON_TTY_KEY         = "button_tty_mode_key";
+    private static final String BUTTON_HAC_KEY         = "button_hac_key";
+    private static final String BUTTON_DIALPAD_AUTOCOMPLETE = "button_dialpad_autocomplete";
+
+    private static final String BUTTON_GSM_UMTS_OPTIONS = "button_gsm_more_expand_key";
+    private static final String BUTTON_CDMA_OPTIONS = "button_cdma_more_expand_key";
+
+    private static final String VM_NUMBERS_SHARED_PREFERENCES_NAME = "vm_numbers";
+
+    private static final String BUTTON_SIP_CALL_OPTIONS =
+            "sip_call_options_key";
+    private static final String BUTTON_SIP_CALL_OPTIONS_WIFI_ONLY =
+            "sip_call_options_wifi_only_key";
+    private static final String SIP_SETTINGS_CATEGORY_KEY =
+            "sip_settings_category_key";
+
+    private Intent mContactListIntent;
+
+    /** Event for Async voicemail change call */
+    private static final int EVENT_VOICEMAIL_CHANGED        = 500;
+    private static final int EVENT_FORWARDING_CHANGED       = 501;
+    private static final int EVENT_FORWARDING_GET_COMPLETED = 502;
+
+    private static final int MSG_UPDATE_RINGTONE_SUMMARY = 1;
+    private static final int MSG_UPDATE_VOICEMAIL_RINGTONE_SUMMARY = 2;
+
+    // preferred TTY mode
+    // Phone.TTY_MODE_xxx
+    static final int preferredTtyMode = Phone.TTY_MODE_OFF;
+
+    public static final String HAC_KEY = "HACSetting";
+    public static final String HAC_VAL_ON = "ON";
+    public static final String HAC_VAL_OFF = "OFF";
+
+    /** Handle to voicemail pref */
+    private static final int VOICEMAIL_PREF_ID = 1;
+    private static final int VOICEMAIL_PROVIDER_CFG_ID = 2;
+
+    private Phone mPhone;
+
+    private AudioManager mAudioManager;
+    private SipManager mSipManager;
+
+    private static final int VM_NOCHANGE_ERROR = 400;
+    private static final int VM_RESPONSE_ERROR = 500;
+    private static final int FW_SET_RESPONSE_ERROR = 501;
+    private static final int FW_GET_RESPONSE_ERROR = 502;
+
+
+    // dialog identifiers for voicemail
+    private static final int VOICEMAIL_DIALOG_CONFIRM = 600;
+    private static final int VOICEMAIL_FWD_SAVING_DIALOG = 601;
+    private static final int VOICEMAIL_FWD_READING_DIALOG = 602;
+    private static final int VOICEMAIL_REVERTING_DIALOG = 603;
+
+    // status message sent back from handlers
+    private static final int MSG_OK = 100;
+
+    // special statuses for voicemail controls.
+    private static final int MSG_VM_EXCEPTION = 400;
+    private static final int MSG_FW_SET_EXCEPTION = 401;
+    private static final int MSG_FW_GET_EXCEPTION = 402;
+    private static final int MSG_VM_OK = 600;
+    private static final int MSG_VM_NOCHANGE = 700;
+
+    // voicemail notification vibration string constants
+    private static final String VOICEMAIL_VIBRATION_ALWAYS = "always";
+    private static final String VOICEMAIL_VIBRATION_NEVER = "never";
+
+    private EditPhoneNumberPreference mSubMenuVoicemailSettings;
+
+    private Runnable mRingtoneLookupRunnable;
+    private final Handler mRingtoneLookupComplete = new Handler() {
+        @Override
+        public void handleMessage(Message msg) {
+            switch (msg.what) {
+                case MSG_UPDATE_RINGTONE_SUMMARY:
+                    mRingtonePreference.setSummary((CharSequence) msg.obj);
+                    break;
+                case MSG_UPDATE_VOICEMAIL_RINGTONE_SUMMARY:
+                    mVoicemailNotificationRingtone.setSummary((CharSequence) msg.obj);
+                    break;
+            }
+        }
+    };
+
+    private Preference mRingtonePreference;
+    private CheckBoxPreference mVibrateWhenRinging;
+    /** Whether dialpad plays DTMF tone or not. */
+    private CheckBoxPreference mPlayDtmfTone;
+    private CheckBoxPreference mDialpadAutocomplete;
+    private CheckBoxPreference mButtonAutoRetry;
+    private CheckBoxPreference mButtonHAC;
+    private ListPreference mButtonDTMF;
+    private ListPreference mButtonTTY;
+    private ListPreference mButtonSipCallOptions;
+    private ListPreference mVoicemailProviders;
+    private PreferenceScreen mVoicemailSettings;
+    private Preference mVoicemailNotificationRingtone;
+    private CheckBoxPreference mVoicemailNotificationVibrate;
+    private SipSharedPreferences mSipSharedPreferences;
+
+    private class VoiceMailProvider {
+        public VoiceMailProvider(String name, Intent intent) {
+            this.name = name;
+            this.intent = intent;
+        }
+        public String name;
+        public Intent intent;
+    }
+
+    /**
+     * Forwarding settings we are going to save.
+     */
+    private static final int [] FORWARDING_SETTINGS_REASONS = new int[] {
+        CommandsInterface.CF_REASON_UNCONDITIONAL,
+        CommandsInterface.CF_REASON_BUSY,
+        CommandsInterface.CF_REASON_NO_REPLY,
+        CommandsInterface.CF_REASON_NOT_REACHABLE
+    };
+
+    private class VoiceMailProviderSettings {
+        /**
+         * Constructs settings object, setting all conditional forwarding to the specified number
+         */
+        public VoiceMailProviderSettings(String voicemailNumber, String forwardingNumber,
+                int timeSeconds) {
+            this.voicemailNumber = voicemailNumber;
+            if (forwardingNumber == null || forwardingNumber.length() == 0) {
+                this.forwardingSettings = FWD_SETTINGS_DONT_TOUCH;
+            } else {
+                this.forwardingSettings = new CallForwardInfo[FORWARDING_SETTINGS_REASONS.length];
+                for (int i = 0; i < this.forwardingSettings.length; i++) {
+                    CallForwardInfo fi = new CallForwardInfo();
+                    this.forwardingSettings[i] = fi;
+                    fi.reason = FORWARDING_SETTINGS_REASONS[i];
+                    fi.status = (fi.reason == CommandsInterface.CF_REASON_UNCONDITIONAL) ? 0 : 1;
+                    fi.serviceClass = CommandsInterface.SERVICE_CLASS_VOICE;
+                    fi.toa = PhoneNumberUtils.TOA_International;
+                    fi.number = forwardingNumber;
+                    fi.timeSeconds = timeSeconds;
+                }
+            }
+        }
+
+        public VoiceMailProviderSettings(String voicemailNumber, CallForwardInfo[] infos) {
+            this.voicemailNumber = voicemailNumber;
+            this.forwardingSettings = infos;
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (o == null) return false;
+            if (!(o instanceof VoiceMailProviderSettings)) return false;
+            final VoiceMailProviderSettings v = (VoiceMailProviderSettings)o;
+
+            return ((this.voicemailNumber == null &&
+                        v.voicemailNumber == null) ||
+                    this.voicemailNumber != null &&
+                        this.voicemailNumber.equals(v.voicemailNumber))
+                    &&
+                    forwardingSettingsEqual(this.forwardingSettings,
+                            v.forwardingSettings);
+        }
+
+        private boolean forwardingSettingsEqual(CallForwardInfo[] infos1,
+                CallForwardInfo[] infos2) {
+            if (infos1 == infos2) return true;
+            if (infos1 == null || infos2 == null) return false;
+            if (infos1.length != infos2.length) return false;
+            for (int i = 0; i < infos1.length; i++) {
+                CallForwardInfo i1 = infos1[i];
+                CallForwardInfo i2 = infos2[i];
+                if (i1.status != i2.status ||
+                    i1.reason != i2.reason ||
+                    i1.serviceClass != i2.serviceClass ||
+                    i1.toa != i2.toa ||
+                    i1.number != i2.number ||
+                    i1.timeSeconds != i2.timeSeconds) {
+                    return false;
+                }
+            }
+            return true;
+        }
+
+        @Override
+        public String toString() {
+            return voicemailNumber + ((forwardingSettings != null ) ? (", " +
+                    forwardingSettings.toString()) : "");
+        }
+
+        public String voicemailNumber;
+        public CallForwardInfo[] forwardingSettings;
+    }
+
+    private SharedPreferences mPerProviderSavedVMNumbers;
+
+    /**
+     * Results of reading forwarding settings
+     */
+    private CallForwardInfo[] mForwardingReadResults = null;
+
+    /**
+     * Result of forwarding number change.
+     * Keys are reasons (eg. unconditional forwarding).
+     */
+    private Map<Integer, AsyncResult> mForwardingChangeResults = null;
+
+    /**
+     * Expected CF read result types.
+     * This set keeps track of the CF types for which we've issued change
+     * commands so we can tell when we've received all of the responses.
+     */
+    private Collection<Integer> mExpectedChangeResultReasons = null;
+
+    /**
+     * Result of vm number change
+     */
+    private AsyncResult mVoicemailChangeResult = null;
+
+    /**
+     * Previous VM provider setting so we can return to it in case of failure.
+     */
+    private String mPreviousVMProviderKey = null;
+
+    /**
+     * Id of the dialog being currently shown.
+     */
+    private int mCurrentDialogId = 0;
+
+    /**
+     * Flag indicating that we are invoking settings for the voicemail provider programmatically
+     * due to vm provider change.
+     */
+    private boolean mVMProviderSettingsForced = false;
+
+    /**
+     * Flag indicating that we are making changes to vm or fwd numbers
+     * due to vm provider change.
+     */
+    private boolean mChangingVMorFwdDueToProviderChange = false;
+
+    /**
+     * True if we are in the process of vm & fwd number change and vm has already been changed.
+     * This is used to decide what to do in case of rollback.
+     */
+    private boolean mVMChangeCompletedSuccessfully = false;
+
+    /**
+     * True if we had full or partial failure setting forwarding numbers and so need to roll them
+     * back.
+     */
+    private boolean mFwdChangesRequireRollback = false;
+
+    /**
+     * Id of error msg to display to user once we are done reverting the VM provider to the previous
+     * one.
+     */
+    private int mVMOrFwdSetError = 0;
+
+    /**
+     * Data about discovered voice mail settings providers.
+     * Is populated by querying which activities can handle ACTION_CONFIGURE_VOICEMAIL.
+     * They key in this map is package name + activity name.
+     * We always add an entry for the default provider with a key of empty
+     * string and intent value of null.
+     * @see #initVoiceMailProviders()
+     */
+    private final Map<String, VoiceMailProvider> mVMProvidersData =
+            new HashMap<String, VoiceMailProvider>();
+
+    /** string to hold old voicemail number as it is being updated. */
+    private String mOldVmNumber;
+
+    // New call forwarding settings and vm number we will be setting
+    // Need to save these since before we get to saving we need to asynchronously
+    // query the existing forwarding settings.
+    private CallForwardInfo[] mNewFwdSettings;
+    private String mNewVMNumber;
+
+    private boolean mForeground;
+
+    @Override
+    public void onPause() {
+        super.onPause();
+        mForeground = false;
+    }
+
+    /**
+     * We have to pull current settings from the network for all kinds of
+     * voicemail providers so we can tell whether we have to update them,
+     * so use this bit to keep track of whether we're reading settings for the
+     * default provider and should therefore save them out when done.
+     */
+    private boolean mReadingSettingsForDefaultProvider = false;
+
+    /*
+     * Click Listeners, handle click based on objects attached to UI.
+     */
+
+    // Click listener for all toggle events
+    @Override
+    public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
+        if (preference == mSubMenuVoicemailSettings) {
+            return true;
+        } else if (preference == mPlayDtmfTone) {
+            Settings.System.putInt(getContentResolver(), Settings.System.DTMF_TONE_WHEN_DIALING,
+                    mPlayDtmfTone.isChecked() ? 1 : 0);
+        } else if (preference == mDialpadAutocomplete) {
+            Settings.Secure.putInt(getContentResolver(), Settings.Secure.DIALPAD_AUTOCOMPLETE,
+                    mDialpadAutocomplete.isChecked() ? 1 : 0);
+        } else if (preference == mButtonDTMF) {
+            return true;
+        } else if (preference == mButtonTTY) {
+            return true;
+        } else if (preference == mButtonAutoRetry) {
+            android.provider.Settings.Global.putInt(mPhone.getContext().getContentResolver(),
+                    android.provider.Settings.Global.CALL_AUTO_RETRY,
+                    mButtonAutoRetry.isChecked() ? 1 : 0);
+            return true;
+        } else if (preference == mButtonHAC) {
+            int hac = mButtonHAC.isChecked() ? 1 : 0;
+            // Update HAC value in Settings database
+            Settings.System.putInt(mPhone.getContext().getContentResolver(),
+                    Settings.System.HEARING_AID, hac);
+
+            // Update HAC Value in AudioManager
+            mAudioManager.setParameter(HAC_KEY, hac != 0 ? HAC_VAL_ON : HAC_VAL_OFF);
+            return true;
+        } else if (preference == mVoicemailSettings) {
+            if (DBG) log("onPreferenceTreeClick: Voicemail Settings Preference is clicked.");
+            if (preference.getIntent() != null) {
+                if (DBG) {
+                    log("onPreferenceTreeClick: Invoking cfg intent "
+                            + preference.getIntent().getPackage());
+                }
+
+                // onActivityResult() will be responsible for resetting some of variables.
+                this.startActivityForResult(preference.getIntent(), VOICEMAIL_PROVIDER_CFG_ID);
+                return true;
+            } else {
+                if (DBG) {
+                    log("onPreferenceTreeClick:"
+                            + " No Intent is available. Use default behavior defined in xml.");
+                }
+
+                // There's no onActivityResult(), so we need to take care of some of variables
+                // which should be reset here.
+                mPreviousVMProviderKey = DEFAULT_VM_PROVIDER_KEY;
+                mVMProviderSettingsForced = false;
+
+                // This should let the preference use default behavior in the xml.
+                return false;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Implemented to support onPreferenceChangeListener to look for preference
+     * changes.
+     *
+     * @param preference is the preference to be changed
+     * @param objValue should be the value of the selection, NOT its localized
+     * display value.
+     */
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object objValue) {
+        if (DBG) {
+            log("onPreferenceChange(). preferenece: \"" + preference + "\""
+                    + ", value: \"" + objValue + "\"");
+        }
+        if (preference == mVibrateWhenRinging) {
+            boolean doVibrate = (Boolean) objValue;
+            Settings.System.putInt(mPhone.getContext().getContentResolver(),
+                    Settings.System.VIBRATE_WHEN_RINGING, doVibrate ? 1 : 0);
+        } else if (preference == mButtonDTMF) {
+            int index = mButtonDTMF.findIndexOfValue((String) objValue);
+            Settings.System.putInt(mPhone.getContext().getContentResolver(),
+                    Settings.System.DTMF_TONE_TYPE_WHEN_DIALING, index);
+        } else if (preference == mButtonTTY) {
+            handleTTYChange(preference, objValue);
+        } else if (preference == mVoicemailProviders) {
+            final String newProviderKey = (String) objValue;
+            if (DBG) {
+                log("Voicemail Provider changes from \"" + mPreviousVMProviderKey
+                    + "\" to \"" + newProviderKey + "\".");
+            }
+            // If previous provider key and the new one is same, we don't need to handle it.
+            if (mPreviousVMProviderKey.equals(newProviderKey)) {
+                if (DBG) log("No change is made toward VM provider setting.");
+                return true;
+            }
+            updateVMPreferenceWidgets(newProviderKey);
+
+            final VoiceMailProviderSettings newProviderSettings =
+                    loadSettingsForVoiceMailProvider(newProviderKey);
+
+            // If the user switches to a voice mail provider and we have a
+            // numbers stored for it we will automatically change the
+            // phone's
+            // voice mail and forwarding number to the stored ones.
+            // Otherwise we will bring up provider's configuration UI.
+
+            if (newProviderSettings == null) {
+                // Force the user into a configuration of the chosen provider
+                Log.w(LOG_TAG, "Saved preferences not found - invoking config");
+                mVMProviderSettingsForced = true;
+                simulatePreferenceClick(mVoicemailSettings);
+            } else {
+                if (DBG) log("Saved preferences found - switching to them");
+                // Set this flag so if we get a failure we revert to previous provider
+                mChangingVMorFwdDueToProviderChange = true;
+                saveVoiceMailAndForwardingNumber(newProviderKey, newProviderSettings);
+            }
+        } else if (preference == mButtonSipCallOptions) {
+            handleSipCallOptionsChange(objValue);
+        }
+        // always let the preference setting proceed.
+        return true;
+    }
+
+    @Override
+    public void onDialogClosed(EditPhoneNumberPreference preference, int buttonClicked) {
+        if (DBG) log("onPreferenceClick: request preference click on dialog close: " +
+                buttonClicked);
+        if (buttonClicked == DialogInterface.BUTTON_NEGATIVE) {
+            return;
+        }
+
+        if (preference == mSubMenuVoicemailSettings) {
+            handleVMBtnClickRequest();
+        }
+    }
+
+    /**
+     * Implemented for EditPhoneNumberPreference.GetDefaultNumberListener.
+     * This method set the default values for the various
+     * EditPhoneNumberPreference dialogs.
+     */
+    @Override
+    public String onGetDefaultNumber(EditPhoneNumberPreference preference) {
+        if (preference == mSubMenuVoicemailSettings) {
+            // update the voicemail number field, which takes care of the
+            // mSubMenuVoicemailSettings itself, so we should return null.
+            if (DBG) log("updating default for voicemail dialog");
+            updateVoiceNumberField();
+            return null;
+        }
+
+        String vmDisplay = mPhone.getVoiceMailNumber();
+        if (TextUtils.isEmpty(vmDisplay)) {
+            // if there is no voicemail number, we just return null to
+            // indicate no contribution.
+            return null;
+        }
+
+        // Return the voicemail number prepended with "VM: "
+        if (DBG) log("updating default for call forwarding dialogs");
+        return getString(R.string.voicemail_abbreviated) + " " + vmDisplay;
+    }
+
+
+    // override the startsubactivity call to make changes in state consistent.
+    @Override
+    public void startActivityForResult(Intent intent, int requestCode) {
+        if (requestCode == -1) {
+            // this is an intent requested from the preference framework.
+            super.startActivityForResult(intent, requestCode);
+            return;
+        }
+
+        if (DBG) log("startSubActivity: starting requested subactivity");
+        super.startActivityForResult(intent, requestCode);
+    }
+
+    private void switchToPreviousVoicemailProvider() {
+        if (DBG) log("switchToPreviousVoicemailProvider " + mPreviousVMProviderKey);
+        if (mPreviousVMProviderKey != null) {
+            if (mVMChangeCompletedSuccessfully || mFwdChangesRequireRollback) {
+                // we have to revert with carrier
+                if (DBG) {
+                    log("Needs to rollback."
+                            + " mVMChangeCompletedSuccessfully=" + mVMChangeCompletedSuccessfully
+                            + ", mFwdChangesRequireRollback=" + mFwdChangesRequireRollback);
+                }
+
+                showDialogIfForeground(VOICEMAIL_REVERTING_DIALOG);
+                final VoiceMailProviderSettings prevSettings =
+                        loadSettingsForVoiceMailProvider(mPreviousVMProviderKey);
+                if (prevSettings == null) {
+                    // prevSettings never becomes null since it should be already loaded!
+                    Log.e(LOG_TAG, "VoiceMailProviderSettings for the key \""
+                            + mPreviousVMProviderKey + "\" becomes null, which is unexpected.");
+                    if (DBG) {
+                        Log.e(LOG_TAG,
+                                "mVMChangeCompletedSuccessfully: " + mVMChangeCompletedSuccessfully
+                                + ", mFwdChangesRequireRollback: " + mFwdChangesRequireRollback);
+                    }
+                }
+                if (mVMChangeCompletedSuccessfully) {
+                    mNewVMNumber = prevSettings.voicemailNumber;
+                    Log.i(LOG_TAG, "VM change is already completed successfully."
+                            + "Have to revert VM back to " + mNewVMNumber + " again.");
+                    mPhone.setVoiceMailNumber(
+                            mPhone.getVoiceMailAlphaTag().toString(),
+                            mNewVMNumber,
+                            Message.obtain(mRevertOptionComplete, EVENT_VOICEMAIL_CHANGED));
+                }
+                if (mFwdChangesRequireRollback) {
+                    Log.i(LOG_TAG, "Requested to rollback Fwd changes.");
+                    final CallForwardInfo[] prevFwdSettings =
+                        prevSettings.forwardingSettings;
+                    if (prevFwdSettings != null) {
+                        Map<Integer, AsyncResult> results =
+                            mForwardingChangeResults;
+                        resetForwardingChangeState();
+                        for (int i = 0; i < prevFwdSettings.length; i++) {
+                            CallForwardInfo fi = prevFwdSettings[i];
+                            if (DBG) log("Reverting fwd #: " + i + ": " + fi.toString());
+                            // Only revert the settings for which the update
+                            // succeeded
+                            AsyncResult result = results.get(fi.reason);
+                            if (result != null && result.exception == null) {
+                                mExpectedChangeResultReasons.add(fi.reason);
+                                mPhone.setCallForwardingOption(
+                                        (fi.status == 1 ?
+                                                CommandsInterface.CF_ACTION_REGISTRATION :
+                                                CommandsInterface.CF_ACTION_DISABLE),
+                                        fi.reason,
+                                        fi.number,
+                                        fi.timeSeconds,
+                                        mRevertOptionComplete.obtainMessage(
+                                                EVENT_FORWARDING_CHANGED, i, 0));
+                            }
+                        }
+                    }
+                }
+            } else {
+                if (DBG) log("No need to revert");
+                onRevertDone();
+            }
+        }
+    }
+
+    private void onRevertDone() {
+        if (DBG) log("Flipping provider key back to " + mPreviousVMProviderKey);
+        mVoicemailProviders.setValue(mPreviousVMProviderKey);
+        updateVMPreferenceWidgets(mPreviousVMProviderKey);
+        updateVoiceNumberField();
+        if (mVMOrFwdSetError != 0) {
+            showVMDialog(mVMOrFwdSetError);
+            mVMOrFwdSetError = 0;
+        }
+    }
+
+    @Override
+    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
+        if (DBG) {
+            log("onActivityResult: requestCode: " + requestCode
+                    + ", resultCode: " + resultCode
+                    + ", data: " + data);
+        }
+        // there are cases where the contact picker may end up sending us more than one
+        // request.  We want to ignore the request if we're not in the correct state.
+        if (requestCode == VOICEMAIL_PROVIDER_CFG_ID) {
+            boolean failure = false;
+
+            // No matter how the processing of result goes lets clear the flag
+            if (DBG) log("mVMProviderSettingsForced: " + mVMProviderSettingsForced);
+            final boolean isVMProviderSettingsForced = mVMProviderSettingsForced;
+            mVMProviderSettingsForced = false;
+
+            String vmNum = null;
+            if (resultCode != RESULT_OK) {
+                if (DBG) log("onActivityResult: vm provider cfg result not OK.");
+                failure = true;
+            } else {
+                if (data == null) {
+                    if (DBG) log("onActivityResult: vm provider cfg result has no data");
+                    failure = true;
+                } else {
+                    if (data.getBooleanExtra(SIGNOUT_EXTRA, false)) {
+                        if (DBG) log("Provider requested signout");
+                        if (isVMProviderSettingsForced) {
+                            if (DBG) log("Going back to previous provider on signout");
+                            switchToPreviousVoicemailProvider();
+                        } else {
+                            final String victim = getCurrentVoicemailProviderKey();
+                            if (DBG) log("Relaunching activity and ignoring " + victim);
+                            Intent i = new Intent(ACTION_ADD_VOICEMAIL);
+                            i.putExtra(IGNORE_PROVIDER_EXTRA, victim);
+                            i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
+                            this.startActivity(i);
+                        }
+                        return;
+                    }
+                    vmNum = data.getStringExtra(VM_NUMBER_EXTRA);
+                    if (vmNum == null || vmNum.length() == 0) {
+                        if (DBG) log("onActivityResult: vm provider cfg result has no vmnum");
+                        failure = true;
+                    }
+                }
+            }
+            if (failure) {
+                if (DBG) log("Failure in return from voicemail provider");
+                if (isVMProviderSettingsForced) {
+                    switchToPreviousVoicemailProvider();
+                } else {
+                    if (DBG) log("Not switching back the provider since this is not forced config");
+                }
+                return;
+            }
+            mChangingVMorFwdDueToProviderChange = isVMProviderSettingsForced;
+            final String fwdNum = data.getStringExtra(FWD_NUMBER_EXTRA);
+
+            // TODO(iliat): It would be nice to load the current network setting for this and
+            // send it to the provider when it's config is invoked so it can use this as default
+            final int fwdNumTime = data.getIntExtra(FWD_NUMBER_TIME_EXTRA, 20);
+
+            if (DBG) log("onActivityResult: vm provider cfg result " +
+                    (fwdNum != null ? "has" : " does not have") + " forwarding number");
+            saveVoiceMailAndForwardingNumber(getCurrentVoicemailProviderKey(),
+                    new VoiceMailProviderSettings(vmNum, fwdNum, fwdNumTime));
+            return;
+        }
+
+        if (requestCode == VOICEMAIL_PREF_ID) {
+            if (resultCode != RESULT_OK) {
+                if (DBG) log("onActivityResult: contact picker result not OK.");
+                return;
+            }
+
+            Cursor cursor = null;
+            try {
+                cursor = getContentResolver().query(data.getData(),
+                    NUM_PROJECTION, null, null, null);
+                if ((cursor == null) || (!cursor.moveToFirst())) {
+                    if (DBG) log("onActivityResult: bad contact data, no results found.");
+                    return;
+                }
+                mSubMenuVoicemailSettings.onPickActivityResult(cursor.getString(0));
+                return;
+            } finally {
+                if (cursor != null) {
+                    cursor.close();
+                }
+            }
+        }
+
+        super.onActivityResult(requestCode, resultCode, data);
+    }
+
+    // Voicemail button logic
+    private void handleVMBtnClickRequest() {
+        // normally called on the dialog close.
+
+        // Since we're stripping the formatting out on the getPhoneNumber()
+        // call now, we won't need to do so here anymore.
+
+        saveVoiceMailAndForwardingNumber(
+                getCurrentVoicemailProviderKey(),
+                new VoiceMailProviderSettings(mSubMenuVoicemailSettings.getPhoneNumber(),
+                        FWD_SETTINGS_DONT_TOUCH));
+    }
+
+
+    /**
+     * Wrapper around showDialog() that will silently do nothing if we're
+     * not in the foreground.
+     *
+     * This is useful here because most of the dialogs we display from
+     * this class are triggered by asynchronous events (like
+     * success/failure messages from the telephony layer) and it's
+     * possible for those events to come in even after the user has gone
+     * to a different screen.
+     */
+    // TODO: this is too brittle: it's still easy to accidentally add new
+    // code here that calls showDialog() directly (which will result in a
+    // WindowManager$BadTokenException if called after the activity has
+    // been stopped.)
+    //
+    // It would be cleaner to do the "if (mForeground)" check in one
+    // central place, maybe by using a single Handler for all asynchronous
+    // events (and have *that* discard events if we're not in the
+    // foreground.)
+    //
+    // Unfortunately it's not that simple, since we sometimes need to do
+    // actual work to handle these events whether or not we're in the
+    // foreground (see the Handler code in mSetOptionComplete for
+    // example.)
+    private void showDialogIfForeground(int id) {
+        if (mForeground) {
+            showDialog(id);
+        }
+    }
+
+    private void dismissDialogSafely(int id) {
+        try {
+            dismissDialog(id);
+        } catch (IllegalArgumentException e) {
+            // This is expected in the case where we were in the background
+            // at the time we would normally have shown the dialog, so we didn't
+            // show it.
+        }
+    }
+
+    private void saveVoiceMailAndForwardingNumber(String key,
+            VoiceMailProviderSettings newSettings) {
+        if (DBG) log("saveVoiceMailAndForwardingNumber: " + newSettings.toString());
+        mNewVMNumber = newSettings.voicemailNumber;
+        // empty vm number == clearing the vm number ?
+        if (mNewVMNumber == null) {
+            mNewVMNumber = "";
+        }
+
+        mNewFwdSettings = newSettings.forwardingSettings;
+        if (DBG) log("newFwdNumber " +
+                String.valueOf((mNewFwdSettings != null ? mNewFwdSettings.length : 0))
+                + " settings");
+
+        // No fwd settings on CDMA
+        if (mPhone.getPhoneType() == PhoneConstants.PHONE_TYPE_CDMA) {
+            if (DBG) log("ignoring forwarding setting since this is CDMA phone");
+            mNewFwdSettings = FWD_SETTINGS_DONT_TOUCH;
+        }
+
+        //throw a warning if the vm is the same and we do not touch forwarding.
+        if (mNewVMNumber.equals(mOldVmNumber) && mNewFwdSettings == FWD_SETTINGS_DONT_TOUCH) {
+            showVMDialog(MSG_VM_NOCHANGE);
+            return;
+        }
+
+        maybeSaveSettingsForVoicemailProvider(key, newSettings);
+        mVMChangeCompletedSuccessfully = false;
+        mFwdChangesRequireRollback = false;
+        mVMOrFwdSetError = 0;
+        if (!key.equals(mPreviousVMProviderKey)) {
+            mReadingSettingsForDefaultProvider =
+                    mPreviousVMProviderKey.equals(DEFAULT_VM_PROVIDER_KEY);
+            if (DBG) log("Reading current forwarding settings");
+            mForwardingReadResults = new CallForwardInfo[FORWARDING_SETTINGS_REASONS.length];
+            for (int i = 0; i < FORWARDING_SETTINGS_REASONS.length; i++) {
+                mForwardingReadResults[i] = null;
+                mPhone.getCallForwardingOption(FORWARDING_SETTINGS_REASONS[i],
+                        mGetOptionComplete.obtainMessage(EVENT_FORWARDING_GET_COMPLETED, i, 0));
+            }
+            showDialogIfForeground(VOICEMAIL_FWD_READING_DIALOG);
+        } else {
+            saveVoiceMailAndForwardingNumberStage2();
+        }
+    }
+
+    private final Handler mGetOptionComplete = new Handler() {
+        @Override
+        public void handleMessage(Message msg) {
+            AsyncResult result = (AsyncResult) msg.obj;
+            switch (msg.what) {
+                case EVENT_FORWARDING_GET_COMPLETED:
+                    handleForwardingSettingsReadResult(result, msg.arg1);
+                    break;
+            }
+        }
+    };
+
+    private void handleForwardingSettingsReadResult(AsyncResult ar, int idx) {
+        if (DBG) Log.d(LOG_TAG, "handleForwardingSettingsReadResult: " + idx);
+        Throwable error = null;
+        if (ar.exception != null) {
+            if (DBG) Log.d(LOG_TAG, "FwdRead: ar.exception=" +
+                    ar.exception.getMessage());
+            error = ar.exception;
+        }
+        if (ar.userObj instanceof Throwable) {
+            if (DBG) Log.d(LOG_TAG, "FwdRead: userObj=" +
+                    ((Throwable)ar.userObj).getMessage());
+            error = (Throwable)ar.userObj;
+        }
+
+        // We may have already gotten an error and decided to ignore the other results.
+        if (mForwardingReadResults == null) {
+            if (DBG) Log.d(LOG_TAG, "ignoring fwd reading result: " + idx);
+            return;
+        }
+
+        // In case of error ignore other results, show an error dialog
+        if (error != null) {
+            if (DBG) Log.d(LOG_TAG, "Error discovered for fwd read : " + idx);
+            mForwardingReadResults = null;
+            dismissDialogSafely(VOICEMAIL_FWD_READING_DIALOG);
+            showVMDialog(MSG_FW_GET_EXCEPTION);
+            return;
+        }
+
+        // Get the forwarding info
+        final CallForwardInfo cfInfoArray[] = (CallForwardInfo[]) ar.result;
+        CallForwardInfo fi = null;
+        for (int i = 0 ; i < cfInfoArray.length; i++) {
+            if ((cfInfoArray[i].serviceClass & CommandsInterface.SERVICE_CLASS_VOICE) != 0) {
+                fi = cfInfoArray[i];
+                break;
+            }
+        }
+        if (fi == null) {
+
+            // In case we go nothing it means we need this reason disabled
+            // so create a CallForwardInfo for capturing this
+            if (DBG) Log.d(LOG_TAG, "Creating default info for " + idx);
+            fi = new CallForwardInfo();
+            fi.status = 0;
+            fi.reason = FORWARDING_SETTINGS_REASONS[idx];
+            fi.serviceClass = CommandsInterface.SERVICE_CLASS_VOICE;
+        } else {
+            // if there is not a forwarding number, ensure the entry is set to "not active."
+            if (fi.number == null || fi.number.length() == 0) {
+                fi.status = 0;
+            }
+
+            if (DBG) Log.d(LOG_TAG, "Got  " + fi.toString() + " for " + idx);
+        }
+        mForwardingReadResults[idx] = fi;
+
+        // Check if we got all the results already
+        boolean done = true;
+        for (int i = 0; i < mForwardingReadResults.length; i++) {
+            if (mForwardingReadResults[i] == null) {
+                done = false;
+                break;
+            }
+        }
+        if (done) {
+            if (DBG) Log.d(LOG_TAG, "Done receiving fwd info");
+            dismissDialogSafely(VOICEMAIL_FWD_READING_DIALOG);
+            if (mReadingSettingsForDefaultProvider) {
+                maybeSaveSettingsForVoicemailProvider(DEFAULT_VM_PROVIDER_KEY,
+                        new VoiceMailProviderSettings(this.mOldVmNumber,
+                                mForwardingReadResults));
+                mReadingSettingsForDefaultProvider = false;
+            }
+            saveVoiceMailAndForwardingNumberStage2();
+        } else {
+            if (DBG) Log.d(LOG_TAG, "Not done receiving fwd info");
+        }
+    }
+
+    private CallForwardInfo infoForReason(CallForwardInfo[] infos, int reason) {
+        CallForwardInfo result = null;
+        if (null != infos) {
+            for (CallForwardInfo info : infos) {
+                if (info.reason == reason) {
+                    result = info;
+                    break;
+                }
+            }
+        }
+        return result;
+    }
+
+    private boolean isUpdateRequired(CallForwardInfo oldInfo,
+            CallForwardInfo newInfo) {
+        boolean result = true;
+        if (0 == newInfo.status) {
+            // If we're disabling a type of forwarding, and it's already
+            // disabled for the account, don't make any change
+            if (oldInfo != null && oldInfo.status == 0) {
+                result = false;
+            }
+        }
+        return result;
+    }
+
+    private void resetForwardingChangeState() {
+        mForwardingChangeResults = new HashMap<Integer, AsyncResult>();
+        mExpectedChangeResultReasons = new HashSet<Integer>();
+    }
+
+    // Called after we are done saving the previous forwarding settings if
+    // we needed.
+    private void saveVoiceMailAndForwardingNumberStage2() {
+        mForwardingChangeResults = null;
+        mVoicemailChangeResult = null;
+        if (mNewFwdSettings != FWD_SETTINGS_DONT_TOUCH) {
+            resetForwardingChangeState();
+            for (int i = 0; i < mNewFwdSettings.length; i++) {
+                CallForwardInfo fi = mNewFwdSettings[i];
+
+                final boolean doUpdate = isUpdateRequired(infoForReason(
+                            mForwardingReadResults, fi.reason), fi);
+
+                if (doUpdate) {
+                    if (DBG) log("Setting fwd #: " + i + ": " + fi.toString());
+                    mExpectedChangeResultReasons.add(i);
+
+                    mPhone.setCallForwardingOption(
+                            fi.status == 1 ?
+                                    CommandsInterface.CF_ACTION_REGISTRATION :
+                                    CommandsInterface.CF_ACTION_DISABLE,
+                            fi.reason,
+                            fi.number,
+                            fi.timeSeconds,
+                            mSetOptionComplete.obtainMessage(
+                                    EVENT_FORWARDING_CHANGED, fi.reason, 0));
+                }
+            }
+            showDialogIfForeground(VOICEMAIL_FWD_SAVING_DIALOG);
+        } else {
+            if (DBG) log("Not touching fwd #");
+            setVMNumberWithCarrier();
+        }
+    }
+
+    private void setVMNumberWithCarrier() {
+        if (DBG) log("save voicemail #: " + mNewVMNumber);
+        mPhone.setVoiceMailNumber(
+                mPhone.getVoiceMailAlphaTag().toString(),
+                mNewVMNumber,
+                Message.obtain(mSetOptionComplete, EVENT_VOICEMAIL_CHANGED));
+    }
+
+    /**
+     * Callback to handle option update completions
+     */
+    private final Handler mSetOptionComplete = new Handler() {
+        @Override
+        public void handleMessage(Message msg) {
+            AsyncResult result = (AsyncResult) msg.obj;
+            boolean done = false;
+            switch (msg.what) {
+                case EVENT_VOICEMAIL_CHANGED:
+                    mVoicemailChangeResult = result;
+                    mVMChangeCompletedSuccessfully = checkVMChangeSuccess() == null;
+                    if (DBG) log("VM change complete msg, VM change done = " +
+                            String.valueOf(mVMChangeCompletedSuccessfully));
+                    done = true;
+                    break;
+                case EVENT_FORWARDING_CHANGED:
+                    mForwardingChangeResults.put(msg.arg1, result);
+                    if (result.exception != null) {
+                        Log.w(LOG_TAG, "Error in setting fwd# " + msg.arg1 + ": " +
+                                result.exception.getMessage());
+                    } else {
+                        if (DBG) log("Success in setting fwd# " + msg.arg1);
+                    }
+                    final boolean completed = checkForwardingCompleted();
+                    if (completed) {
+                        if (checkFwdChangeSuccess() == null) {
+                            if (DBG) log("Overall fwd changes completed ok, starting vm change");
+                            setVMNumberWithCarrier();
+                        } else {
+                            Log.w(LOG_TAG, "Overall fwd changes completed in failure. " +
+                                    "Check if we need to try rollback for some settings.");
+                            mFwdChangesRequireRollback = false;
+                            Iterator<Map.Entry<Integer,AsyncResult>> it =
+                                mForwardingChangeResults.entrySet().iterator();
+                            while (it.hasNext()) {
+                                Map.Entry<Integer,AsyncResult> entry = it.next();
+                                if (entry.getValue().exception == null) {
+                                    // If at least one succeeded we have to revert
+                                    Log.i(LOG_TAG, "Rollback will be required");
+                                    mFwdChangesRequireRollback = true;
+                                    break;
+                                }
+                            }
+                            if (!mFwdChangesRequireRollback) {
+                                Log.i(LOG_TAG, "No rollback needed.");
+                            }
+                            done = true;
+                        }
+                    }
+                    break;
+                default:
+                    // TODO: should never reach this, may want to throw exception
+            }
+            if (done) {
+                if (DBG) log("All VM provider related changes done");
+                if (mForwardingChangeResults != null) {
+                    dismissDialogSafely(VOICEMAIL_FWD_SAVING_DIALOG);
+                }
+                handleSetVMOrFwdMessage();
+            }
+        }
+    };
+
+    /**
+     * Callback to handle option revert completions
+     */
+    private final Handler mRevertOptionComplete = new Handler() {
+        @Override
+        public void handleMessage(Message msg) {
+            AsyncResult result = (AsyncResult) msg.obj;
+            switch (msg.what) {
+                case EVENT_VOICEMAIL_CHANGED:
+                    mVoicemailChangeResult = result;
+                    if (DBG) log("VM revert complete msg");
+                    break;
+                case EVENT_FORWARDING_CHANGED:
+                    mForwardingChangeResults.put(msg.arg1, result);
+                    if (result.exception != null) {
+                        if (DBG) log("Error in reverting fwd# " + msg.arg1 + ": " +
+                                result.exception.getMessage());
+                    } else {
+                        if (DBG) log("Success in reverting fwd# " + msg.arg1);
+                    }
+                    if (DBG) log("FWD revert complete msg ");
+                    break;
+                default:
+                    // TODO: should never reach this, may want to throw exception
+            }
+            final boolean done =
+                (!mVMChangeCompletedSuccessfully || mVoicemailChangeResult != null) &&
+                (!mFwdChangesRequireRollback || checkForwardingCompleted());
+            if (done) {
+                if (DBG) log("All VM reverts done");
+                dismissDialogSafely(VOICEMAIL_REVERTING_DIALOG);
+                onRevertDone();
+            }
+        }
+    };
+
+    /**
+     * @return true if forwarding change has completed
+     */
+    private boolean checkForwardingCompleted() {
+        boolean result;
+        if (mForwardingChangeResults == null) {
+            result = true;
+        } else {
+            // return true iff there is a change result for every reason for
+            // which we expected a result
+            result = true;
+            for (Integer reason : mExpectedChangeResultReasons) {
+                if (mForwardingChangeResults.get(reason) == null) {
+                    result = false;
+                    break;
+                }
+            }
+        }
+        return result;
+    }
+    /**
+     * @return error string or null if successful
+     */
+    private String checkFwdChangeSuccess() {
+        String result = null;
+        Iterator<Map.Entry<Integer,AsyncResult>> it =
+            mForwardingChangeResults.entrySet().iterator();
+        while (it.hasNext()) {
+            Map.Entry<Integer,AsyncResult> entry = it.next();
+            Throwable exception = entry.getValue().exception;
+            if (exception != null) {
+                result = exception.getMessage();
+                if (result == null) {
+                    result = "";
+                }
+                break;
+            }
+        }
+        return result;
+    }
+
+    /**
+     * @return error string or null if successful
+     */
+    private String checkVMChangeSuccess() {
+        if (mVoicemailChangeResult.exception != null) {
+            final String msg = mVoicemailChangeResult.exception.getMessage();
+            if (msg == null) {
+                return "";
+            }
+            return msg;
+        }
+        return null;
+    }
+
+    private void handleSetVMOrFwdMessage() {
+        if (DBG) {
+            log("handleSetVMMessage: set VM request complete");
+        }
+        boolean success = true;
+        boolean fwdFailure = false;
+        String exceptionMessage = "";
+        if (mForwardingChangeResults != null) {
+            exceptionMessage = checkFwdChangeSuccess();
+            if (exceptionMessage != null) {
+                success = false;
+                fwdFailure = true;
+            }
+        }
+        if (success) {
+            exceptionMessage = checkVMChangeSuccess();
+            if (exceptionMessage != null) {
+                success = false;
+            }
+        }
+        if (success) {
+            if (DBG) log("change VM success!");
+            handleVMAndFwdSetSuccess(MSG_VM_OK);
+        } else {
+            if (fwdFailure) {
+                Log.w(LOG_TAG, "Failed to change fowarding setting. Reason: " + exceptionMessage);
+                handleVMOrFwdSetError(MSG_FW_SET_EXCEPTION);
+            } else {
+                Log.w(LOG_TAG, "Failed to change voicemail. Reason: " + exceptionMessage);
+                handleVMOrFwdSetError(MSG_VM_EXCEPTION);
+            }
+        }
+    }
+
+    /**
+     * Called when Voicemail Provider or its forwarding settings failed. Rolls back partly made
+     * changes to those settings and show "failure" dialog.
+     *
+     * @param msgId Message ID used for the specific error case. {@link #MSG_FW_SET_EXCEPTION} or
+     * {@link #MSG_VM_EXCEPTION}
+     */
+    private void handleVMOrFwdSetError(int msgId) {
+        if (mChangingVMorFwdDueToProviderChange) {
+            mVMOrFwdSetError = msgId;
+            mChangingVMorFwdDueToProviderChange = false;
+            switchToPreviousVoicemailProvider();
+            return;
+        }
+        mChangingVMorFwdDueToProviderChange = false;
+        showVMDialog(msgId);
+        updateVoiceNumberField();
+    }
+
+    /**
+     * Called when Voicemail Provider and its forwarding settings were successfully finished.
+     * This updates a bunch of variables and show "success" dialog.
+     */
+    private void handleVMAndFwdSetSuccess(int msg) {
+        if (DBG) {
+            log("handleVMAndFwdSetSuccess(). current voicemail provider key: "
+                    + getCurrentVoicemailProviderKey());
+        }
+        mPreviousVMProviderKey = getCurrentVoicemailProviderKey();
+        mChangingVMorFwdDueToProviderChange = false;
+        showVMDialog(msg);
+        updateVoiceNumberField();
+    }
+
+    /**
+     * Update the voicemail number from what we've recorded on the sim.
+     */
+    private void updateVoiceNumberField() {
+        if (DBG) {
+            log("updateVoiceNumberField(). mSubMenuVoicemailSettings=" + mSubMenuVoicemailSettings);
+        }
+        if (mSubMenuVoicemailSettings == null) {
+            return;
+        }
+
+        mOldVmNumber = mPhone.getVoiceMailNumber();
+        if (mOldVmNumber == null) {
+            mOldVmNumber = "";
+        }
+        mSubMenuVoicemailSettings.setPhoneNumber(mOldVmNumber);
+        final String summary = (mOldVmNumber.length() > 0) ? mOldVmNumber :
+                getString(R.string.voicemail_number_not_set);
+        mSubMenuVoicemailSettings.setSummary(summary);
+    }
+
+    /*
+     * Helper Methods for Activity class.
+     * The initial query commands are split into two pieces now
+     * for individual expansion.  This combined with the ability
+     * to cancel queries allows for a much better user experience,
+     * and also ensures that the user only waits to update the
+     * data that is relevant.
+     */
+
+    @Override
+    protected void onPrepareDialog(int id, Dialog dialog) {
+        super.onPrepareDialog(id, dialog);
+        mCurrentDialogId = id;
+    }
+
+    // dialog creation method, called by showDialog()
+    @Override
+    protected Dialog onCreateDialog(int id) {
+        if ((id == VM_RESPONSE_ERROR) || (id == VM_NOCHANGE_ERROR) ||
+            (id == FW_SET_RESPONSE_ERROR) || (id == FW_GET_RESPONSE_ERROR) ||
+                (id == VOICEMAIL_DIALOG_CONFIRM)) {
+
+            AlertDialog.Builder b = new AlertDialog.Builder(this);
+
+            int msgId;
+            int titleId = R.string.error_updating_title;
+            switch (id) {
+                case VOICEMAIL_DIALOG_CONFIRM:
+                    msgId = R.string.vm_changed;
+                    titleId = R.string.voicemail;
+                    // Set Button 2
+                    b.setNegativeButton(R.string.close_dialog, this);
+                    break;
+                case VM_NOCHANGE_ERROR:
+                    // even though this is technically an error,
+                    // keep the title friendly.
+                    msgId = R.string.no_change;
+                    titleId = R.string.voicemail;
+                    // Set Button 2
+                    b.setNegativeButton(R.string.close_dialog, this);
+                    break;
+                case VM_RESPONSE_ERROR:
+                    msgId = R.string.vm_change_failed;
+                    // Set Button 1
+                    b.setPositiveButton(R.string.close_dialog, this);
+                    break;
+                case FW_SET_RESPONSE_ERROR:
+                    msgId = R.string.fw_change_failed;
+                    // Set Button 1
+                    b.setPositiveButton(R.string.close_dialog, this);
+                    break;
+                case FW_GET_RESPONSE_ERROR:
+                    msgId = R.string.fw_get_in_vm_failed;
+                    b.setPositiveButton(R.string.alert_dialog_yes, this);
+                    b.setNegativeButton(R.string.alert_dialog_no, this);
+                    break;
+                default:
+                    msgId = R.string.exception_error;
+                    // Set Button 3, tells the activity that the error is
+                    // not recoverable on dialog exit.
+                    b.setNeutralButton(R.string.close_dialog, this);
+                    break;
+            }
+
+            b.setTitle(getText(titleId));
+            String message = getText(msgId).toString();
+            b.setMessage(message);
+            b.setCancelable(false);
+            AlertDialog dialog = b.create();
+
+            // make the dialog more obvious by bluring the background.
+            dialog.getWindow().addFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND);
+
+            return dialog;
+        } else if (id == VOICEMAIL_FWD_SAVING_DIALOG || id == VOICEMAIL_FWD_READING_DIALOG ||
+                id == VOICEMAIL_REVERTING_DIALOG) {
+            ProgressDialog dialog = new ProgressDialog(this);
+            dialog.setTitle(getText(R.string.updating_title));
+            dialog.setIndeterminate(true);
+            dialog.setCancelable(false);
+            dialog.setMessage(getText(
+                    id == VOICEMAIL_FWD_SAVING_DIALOG ? R.string.updating_settings :
+                    (id == VOICEMAIL_REVERTING_DIALOG ? R.string.reverting_settings :
+                    R.string.reading_settings)));
+            return dialog;
+        }
+
+
+        return null;
+    }
+
+    // This is a method implemented for DialogInterface.OnClickListener.
+    // Used with the error dialog to close the app, voicemail dialog to just dismiss.
+    // Close button is mapped to BUTTON_POSITIVE for the errors that close the activity,
+    // while those that are mapped to BUTTON_NEUTRAL only move the preference focus.
+    public void onClick(DialogInterface dialog, int which) {
+        dialog.dismiss();
+        switch (which){
+            case DialogInterface.BUTTON_NEUTRAL:
+                if (DBG) log("Neutral button");
+                break;
+            case DialogInterface.BUTTON_NEGATIVE:
+                if (DBG) log("Negative button");
+                if (mCurrentDialogId == FW_GET_RESPONSE_ERROR) {
+                    // We failed to get current forwarding settings and the user
+                    // does not wish to continue.
+                    switchToPreviousVoicemailProvider();
+                }
+                break;
+            case DialogInterface.BUTTON_POSITIVE:
+                if (DBG) log("Positive button");
+                if (mCurrentDialogId == FW_GET_RESPONSE_ERROR) {
+                    // We failed to get current forwarding settings but the user
+                    // wishes to continue changing settings to the new vm provider
+                    saveVoiceMailAndForwardingNumberStage2();
+                } else {
+                    finish();
+                }
+                return;
+            default:
+                // just let the dialog close and go back to the input
+        }
+        // In all dialogs, all buttons except BUTTON_POSITIVE lead to the end of user interaction
+        // with settings UI. If we were called to explicitly configure voice mail then
+        // we finish the settings activity here to come back to whatever the user was doing.
+        if (getIntent().getAction().equals(ACTION_ADD_VOICEMAIL)) {
+            finish();
+        }
+    }
+
+    // set the app state with optional status.
+    private void showVMDialog(int msgStatus) {
+        switch (msgStatus) {
+            // It's a bit worrisome to punt in the error cases here when we're
+            // not in the foreground; maybe toast instead?
+            case MSG_VM_EXCEPTION:
+                showDialogIfForeground(VM_RESPONSE_ERROR);
+                break;
+            case MSG_FW_SET_EXCEPTION:
+                showDialogIfForeground(FW_SET_RESPONSE_ERROR);
+                break;
+            case MSG_FW_GET_EXCEPTION:
+                showDialogIfForeground(FW_GET_RESPONSE_ERROR);
+                break;
+            case MSG_VM_NOCHANGE:
+                showDialogIfForeground(VM_NOCHANGE_ERROR);
+                break;
+            case MSG_VM_OK:
+                showDialogIfForeground(VOICEMAIL_DIALOG_CONFIRM);
+                break;
+            case MSG_OK:
+            default:
+                // This should never happen.
+        }
+    }
+
+    /*
+     * Activity class methods
+     */
+
+    @Override
+    protected void onCreate(Bundle icicle) {
+        super.onCreate(icicle);
+        if (DBG) log("onCreate(). Intent: " + getIntent());
+        mPhone = PhoneGlobals.getPhone();
+
+        addPreferencesFromResource(R.xml.call_feature_setting);
+
+        mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
+
+        // get buttons
+        PreferenceScreen prefSet = getPreferenceScreen();
+        mSubMenuVoicemailSettings = (EditPhoneNumberPreference)findPreference(BUTTON_VOICEMAIL_KEY);
+        if (mSubMenuVoicemailSettings != null) {
+            mSubMenuVoicemailSettings.setParentActivity(this, VOICEMAIL_PREF_ID, this);
+            mSubMenuVoicemailSettings.setDialogOnClosedListener(this);
+            mSubMenuVoicemailSettings.setDialogTitle(R.string.voicemail_settings_number_label);
+        }
+
+        mRingtonePreference = findPreference(BUTTON_RINGTONE_KEY);
+        mVibrateWhenRinging = (CheckBoxPreference) findPreference(BUTTON_VIBRATE_ON_RING);
+        mPlayDtmfTone = (CheckBoxPreference) findPreference(BUTTON_PLAY_DTMF_TONE);
+        mDialpadAutocomplete = (CheckBoxPreference) findPreference(BUTTON_DIALPAD_AUTOCOMPLETE);
+        mButtonDTMF = (ListPreference) findPreference(BUTTON_DTMF_KEY);
+        mButtonAutoRetry = (CheckBoxPreference) findPreference(BUTTON_RETRY_KEY);
+        mButtonHAC = (CheckBoxPreference) findPreference(BUTTON_HAC_KEY);
+        mButtonTTY = (ListPreference) findPreference(BUTTON_TTY_KEY);
+        mVoicemailProviders = (ListPreference) findPreference(BUTTON_VOICEMAIL_PROVIDER_KEY);
+        if (mVoicemailProviders != null) {
+            mVoicemailProviders.setOnPreferenceChangeListener(this);
+            mVoicemailSettings = (PreferenceScreen)findPreference(BUTTON_VOICEMAIL_SETTING_KEY);
+            mVoicemailNotificationRingtone =
+                    findPreference(BUTTON_VOICEMAIL_NOTIFICATION_RINGTONE_KEY);
+            mVoicemailNotificationVibrate =
+                    (CheckBoxPreference) findPreference(BUTTON_VOICEMAIL_NOTIFICATION_VIBRATE_KEY);
+            initVoiceMailProviders();
+        }
+
+        if (mVibrateWhenRinging != null) {
+            Vibrator vibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
+            if (vibrator != null && vibrator.hasVibrator()) {
+                mVibrateWhenRinging.setOnPreferenceChangeListener(this);
+            } else {
+                prefSet.removePreference(mVibrateWhenRinging);
+                mVibrateWhenRinging = null;
+            }
+        }
+
+        final ContentResolver contentResolver = getContentResolver();
+
+        if (mPlayDtmfTone != null) {
+            mPlayDtmfTone.setChecked(Settings.System.getInt(contentResolver,
+                    Settings.System.DTMF_TONE_WHEN_DIALING, 1) != 0);
+        }
+
+        if (mDialpadAutocomplete != null) {
+            mDialpadAutocomplete.setChecked(Settings.Secure.getInt(contentResolver,
+                    Settings.Secure.DIALPAD_AUTOCOMPLETE, 0) != 0);
+        }
+
+        if (mButtonDTMF != null) {
+            if (getResources().getBoolean(R.bool.dtmf_type_enabled)) {
+                mButtonDTMF.setOnPreferenceChangeListener(this);
+            } else {
+                prefSet.removePreference(mButtonDTMF);
+                mButtonDTMF = null;
+            }
+        }
+
+        if (mButtonAutoRetry != null) {
+            if (getResources().getBoolean(R.bool.auto_retry_enabled)) {
+                mButtonAutoRetry.setOnPreferenceChangeListener(this);
+            } else {
+                prefSet.removePreference(mButtonAutoRetry);
+                mButtonAutoRetry = null;
+            }
+        }
+
+        if (mButtonHAC != null) {
+            if (getResources().getBoolean(R.bool.hac_enabled)) {
+
+                mButtonHAC.setOnPreferenceChangeListener(this);
+            } else {
+                prefSet.removePreference(mButtonHAC);
+                mButtonHAC = null;
+            }
+        }
+
+        if (mButtonTTY != null) {
+            if (getResources().getBoolean(R.bool.tty_enabled)) {
+                mButtonTTY.setOnPreferenceChangeListener(this);
+            } else {
+                prefSet.removePreference(mButtonTTY);
+                mButtonTTY = null;
+            }
+        }
+
+        if (!getResources().getBoolean(R.bool.world_phone)) {
+            Preference options = prefSet.findPreference(BUTTON_CDMA_OPTIONS);
+            if (options != null)
+                prefSet.removePreference(options);
+            options = prefSet.findPreference(BUTTON_GSM_UMTS_OPTIONS);
+            if (options != null)
+                prefSet.removePreference(options);
+
+            int phoneType = mPhone.getPhoneType();
+            if (phoneType == PhoneConstants.PHONE_TYPE_CDMA) {
+                Preference fdnButton = prefSet.findPreference(BUTTON_FDN_KEY);
+                if (fdnButton != null)
+                    prefSet.removePreference(fdnButton);
+                if (!getResources().getBoolean(R.bool.config_voice_privacy_disable)) {
+                    addPreferencesFromResource(R.xml.cdma_call_privacy);
+                }
+            } else if (phoneType == PhoneConstants.PHONE_TYPE_GSM) {
+                addPreferencesFromResource(R.xml.gsm_umts_call_options);
+            } else {
+                throw new IllegalStateException("Unexpected phone type: " + phoneType);
+            }
+        }
+
+        // create intent to bring up contact list
+        mContactListIntent = new Intent(Intent.ACTION_GET_CONTENT);
+        mContactListIntent.setType(android.provider.Contacts.Phones.CONTENT_ITEM_TYPE);
+
+        // check the intent that started this activity and pop up the voicemail
+        // dialog if we've been asked to.
+        // If we have at least one non default VM provider registered then bring up
+        // the selection for the VM provider, otherwise bring up a VM number dialog.
+        // We only bring up the dialog the first time we are called (not after orientation change)
+        if (icicle == null) {
+            if (getIntent().getAction().equals(ACTION_ADD_VOICEMAIL) &&
+                    mVoicemailProviders != null) {
+                if (DBG) {
+                    log("ACTION_ADD_VOICEMAIL Intent is thrown. current VM data size: "
+                            + mVMProvidersData.size());
+                }
+                if (mVMProvidersData.size() > 1) {
+                    simulatePreferenceClick(mVoicemailProviders);
+                } else {
+                    onPreferenceChange(mVoicemailProviders, DEFAULT_VM_PROVIDER_KEY);
+                    mVoicemailProviders.setValue(DEFAULT_VM_PROVIDER_KEY);
+                }
+            }
+        }
+        updateVoiceNumberField();
+        mVMProviderSettingsForced = false;
+        createSipCallSettings();
+
+        mRingtoneLookupRunnable = new Runnable() {
+            @Override
+            public void run() {
+                if (mRingtonePreference != null) {
+                    updateRingtoneName(RingtoneManager.TYPE_RINGTONE, mRingtonePreference,
+                            MSG_UPDATE_RINGTONE_SUMMARY);
+                }
+                if (mVoicemailNotificationRingtone != null) {
+                    updateRingtoneName(RingtoneManager.TYPE_NOTIFICATION,
+                            mVoicemailNotificationRingtone, MSG_UPDATE_VOICEMAIL_RINGTONE_SUMMARY);
+                }
+            }
+        };
+
+        ActionBar actionBar = getActionBar();
+        if (actionBar != null) {
+            // android.R.id.home will be triggered in onOptionsItemSelected()
+            actionBar.setDisplayHomeAsUpEnabled(true);
+        }
+    }
+
+    /**
+     * Updates ringtone name. This is a method copied from com.android.settings.SoundSettings
+     *
+     * @see com.android.settings.SoundSettings
+     */
+    private void updateRingtoneName(int type, Preference preference, int msg) {
+        if (preference == null) return;
+        final Uri ringtoneUri;
+        boolean defaultRingtone = false;
+        if (type == RingtoneManager.TYPE_RINGTONE) {
+            // For ringtones, we can just lookup the system default because changing the settings
+            // in Call Settings changes the system default.
+            ringtoneUri = RingtoneManager.getActualDefaultRingtoneUri(this, type);
+        } else {
+            final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(
+                    mPhone.getContext());
+            // for voicemail notifications, we use the value saved in Phone's shared preferences.
+            String uriString = prefs.getString(preference.getKey(), null);
+            if (TextUtils.isEmpty(uriString)) {
+                // silent ringtone
+                ringtoneUri = null;
+            } else {
+                if (uriString.equals(Settings.System.DEFAULT_NOTIFICATION_URI.toString())) {
+                    // If it turns out that the voicemail notification is set to the system
+                    // default notification, we retrieve the actual URI to prevent it from showing
+                    // up as "Unknown Ringtone".
+                    defaultRingtone = true;
+                    ringtoneUri = RingtoneManager.getActualDefaultRingtoneUri(this, type);
+                } else {
+                    ringtoneUri = Uri.parse(uriString);
+                }
+            }
+        }
+        CharSequence summary = getString(com.android.internal.R.string.ringtone_unknown);
+        // Is it a silent ringtone?
+        if (ringtoneUri == null) {
+            summary = getString(com.android.internal.R.string.ringtone_silent);
+        } else {
+            // Fetch the ringtone title from the media provider
+            try {
+                Cursor cursor = getContentResolver().query(ringtoneUri,
+                        new String[] { MediaStore.Audio.Media.TITLE }, null, null, null);
+                if (cursor != null) {
+                    if (cursor.moveToFirst()) {
+                        summary = cursor.getString(0);
+                    }
+                    cursor.close();
+                }
+            } catch (SQLiteException sqle) {
+                // Unknown title for the ringtone
+            }
+        }
+        if (defaultRingtone) {
+            summary = mPhone.getContext().getString(
+                    R.string.default_notification_description, summary);
+        }
+        mRingtoneLookupComplete.sendMessage(mRingtoneLookupComplete.obtainMessage(msg, summary));
+    }
+
+    private void createSipCallSettings() {
+        // Add Internet call settings.
+        if (PhoneUtils.isVoipSupported()) {
+            mSipManager = SipManager.newInstance(this);
+            mSipSharedPreferences = new SipSharedPreferences(this);
+            addPreferencesFromResource(R.xml.sip_settings_category);
+            mButtonSipCallOptions = getSipCallOptionPreference();
+            mButtonSipCallOptions.setOnPreferenceChangeListener(this);
+            mButtonSipCallOptions.setValueIndex(
+                    mButtonSipCallOptions.findIndexOfValue(
+                            mSipSharedPreferences.getSipCallOption()));
+            mButtonSipCallOptions.setSummary(mButtonSipCallOptions.getEntry());
+        }
+    }
+
+    // Gets the call options for SIP depending on whether SIP is allowed only
+    // on Wi-Fi only; also make the other options preference invisible.
+    private ListPreference getSipCallOptionPreference() {
+        ListPreference wifiAnd3G = (ListPreference)
+                findPreference(BUTTON_SIP_CALL_OPTIONS);
+        ListPreference wifiOnly = (ListPreference)
+                findPreference(BUTTON_SIP_CALL_OPTIONS_WIFI_ONLY);
+        PreferenceGroup sipSettings = (PreferenceGroup)
+                findPreference(SIP_SETTINGS_CATEGORY_KEY);
+        if (SipManager.isSipWifiOnly(this)) {
+            sipSettings.removePreference(wifiAnd3G);
+            return wifiOnly;
+        } else {
+            sipSettings.removePreference(wifiOnly);
+            return wifiAnd3G;
+        }
+    }
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+        mForeground = true;
+
+        if (isAirplaneModeOn()) {
+            Preference sipSettings = findPreference(SIP_SETTINGS_CATEGORY_KEY);
+            PreferenceScreen screen = getPreferenceScreen();
+            int count = screen.getPreferenceCount();
+            for (int i = 0 ; i < count ; ++i) {
+                Preference pref = screen.getPreference(i);
+                if (pref != sipSettings) pref.setEnabled(false);
+            }
+            return;
+        }
+
+        if (mVibrateWhenRinging != null) {
+            mVibrateWhenRinging.setChecked(getVibrateWhenRinging(this));
+        }
+
+        if (mButtonDTMF != null) {
+            int dtmf = Settings.System.getInt(getContentResolver(),
+                    Settings.System.DTMF_TONE_TYPE_WHEN_DIALING, Constants.DTMF_TONE_TYPE_NORMAL);
+            mButtonDTMF.setValueIndex(dtmf);
+        }
+
+        if (mButtonAutoRetry != null) {
+            int autoretry = Settings.Global.getInt(getContentResolver(),
+                    Settings.Global.CALL_AUTO_RETRY, 0);
+            mButtonAutoRetry.setChecked(autoretry != 0);
+        }
+
+        if (mButtonHAC != null) {
+            int hac = Settings.System.getInt(getContentResolver(), Settings.System.HEARING_AID, 0);
+            mButtonHAC.setChecked(hac != 0);
+        }
+
+        if (mButtonTTY != null) {
+            int settingsTtyMode = Settings.Secure.getInt(getContentResolver(),
+                    Settings.Secure.PREFERRED_TTY_MODE,
+                    Phone.TTY_MODE_OFF);
+            mButtonTTY.setValue(Integer.toString(settingsTtyMode));
+            updatePreferredTtyModeSummary(settingsTtyMode);
+        }
+
+        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(
+                mPhone.getContext());
+        if (migrateVoicemailVibrationSettingsIfNeeded(prefs)) {
+            mVoicemailNotificationVibrate.setChecked(prefs.getBoolean(
+                    BUTTON_VOICEMAIL_NOTIFICATION_VIBRATE_KEY, false));
+        }
+
+        lookupRingtoneName();
+    }
+
+    // Migrate settings from BUTTON_VOICEMAIL_NOTIFICATION_VIBRATE_WHEN_KEY to
+    // BUTTON_VOICEMAIL_NOTIFICATION_VIBRATE_KEY, if the latter does not exist.
+    // Returns true if migration was performed.
+    public static boolean migrateVoicemailVibrationSettingsIfNeeded(SharedPreferences prefs) {
+        if (!prefs.contains(BUTTON_VOICEMAIL_NOTIFICATION_VIBRATE_KEY)) {
+            String vibrateWhen = prefs.getString(
+                    BUTTON_VOICEMAIL_NOTIFICATION_VIBRATE_WHEN_KEY, VOICEMAIL_VIBRATION_NEVER);
+            // If vibrateWhen is always, then voicemailVibrate should be True.
+            // otherwise if vibrateWhen is "only in silent mode", or "never", then
+            // voicemailVibrate = False.
+            boolean voicemailVibrate = vibrateWhen.equals(VOICEMAIL_VIBRATION_ALWAYS);
+            final SharedPreferences.Editor editor = prefs.edit();
+            editor.putBoolean(BUTTON_VOICEMAIL_NOTIFICATION_VIBRATE_KEY, voicemailVibrate);
+            editor.commit();
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * Obtain the setting for "vibrate when ringing" setting.
+     *
+     * Watch out: if the setting is missing in the device, this will try obtaining the old
+     * "vibrate on ring" setting from AudioManager, and save the previous setting to the new one.
+     */
+    public static boolean getVibrateWhenRinging(Context context) {
+        Vibrator vibrator = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
+        if (vibrator == null || !vibrator.hasVibrator()) {
+            return false;
+        }
+        return Settings.System.getInt(context.getContentResolver(),
+                Settings.System.VIBRATE_WHEN_RINGING, 0) != 0;
+    }
+
+    /**
+     * Lookups ringtone name asynchronously and updates the relevant Preference.
+     */
+    private void lookupRingtoneName() {
+        new Thread(mRingtoneLookupRunnable).start();
+    }
+
+    private boolean isAirplaneModeOn() {
+        return Settings.System.getInt(getContentResolver(),
+                Settings.System.AIRPLANE_MODE_ON, 0) != 0;
+    }
+
+    private void handleTTYChange(Preference preference, Object objValue) {
+        int buttonTtyMode;
+        buttonTtyMode = Integer.valueOf((String) objValue).intValue();
+        int settingsTtyMode = android.provider.Settings.Secure.getInt(
+                getContentResolver(),
+                android.provider.Settings.Secure.PREFERRED_TTY_MODE, preferredTtyMode);
+        if (DBG) log("handleTTYChange: requesting set TTY mode enable (TTY) to" +
+                Integer.toString(buttonTtyMode));
+
+        if (buttonTtyMode != settingsTtyMode) {
+            switch(buttonTtyMode) {
+            case Phone.TTY_MODE_OFF:
+            case Phone.TTY_MODE_FULL:
+            case Phone.TTY_MODE_HCO:
+            case Phone.TTY_MODE_VCO:
+                android.provider.Settings.Secure.putInt(getContentResolver(),
+                        android.provider.Settings.Secure.PREFERRED_TTY_MODE, buttonTtyMode);
+                break;
+            default:
+                buttonTtyMode = Phone.TTY_MODE_OFF;
+            }
+
+            mButtonTTY.setValue(Integer.toString(buttonTtyMode));
+            updatePreferredTtyModeSummary(buttonTtyMode);
+            Intent ttyModeChanged = new Intent(TtyIntent.TTY_PREFERRED_MODE_CHANGE_ACTION);
+            ttyModeChanged.putExtra(TtyIntent.TTY_PREFFERED_MODE, buttonTtyMode);
+            sendBroadcastAsUser(ttyModeChanged, UserHandle.ALL);
+        }
+    }
+
+    private void handleSipCallOptionsChange(Object objValue) {
+        String option = objValue.toString();
+        mSipSharedPreferences.setSipCallOption(option);
+        mButtonSipCallOptions.setValueIndex(
+                mButtonSipCallOptions.findIndexOfValue(option));
+        mButtonSipCallOptions.setSummary(mButtonSipCallOptions.getEntry());
+    }
+
+    private void updatePreferredTtyModeSummary(int TtyMode) {
+        String [] txts = getResources().getStringArray(R.array.tty_mode_entries);
+        switch(TtyMode) {
+            case Phone.TTY_MODE_OFF:
+            case Phone.TTY_MODE_HCO:
+            case Phone.TTY_MODE_VCO:
+            case Phone.TTY_MODE_FULL:
+                mButtonTTY.setSummary(txts[TtyMode]);
+                break;
+            default:
+                mButtonTTY.setEnabled(false);
+                mButtonTTY.setSummary(txts[Phone.TTY_MODE_OFF]);
+        }
+    }
+
+    private static void log(String msg) {
+        Log.d(LOG_TAG, msg);
+    }
+
+    /**
+     * Updates the look of the VM preference widgets based on current VM provider settings.
+     * Note that the provider name is loaded form the found activity via loadLabel in
+     * {@link #initVoiceMailProviders()} in order for it to be localizable.
+     */
+    private void updateVMPreferenceWidgets(String currentProviderSetting) {
+        final String key = currentProviderSetting;
+        final VoiceMailProvider provider = mVMProvidersData.get(key);
+
+        /* This is the case when we are coming up on a freshly wiped phone and there is no
+         persisted value for the list preference mVoicemailProviders.
+         In this case we want to show the UI asking the user to select a voicemail provider as
+         opposed to silently falling back to default one. */
+        if (provider == null) {
+            if (DBG) {
+                log("updateVMPreferenceWidget: provider for the key \"" + key + "\" is null.");
+            }
+            mVoicemailProviders.setSummary(getString(R.string.sum_voicemail_choose_provider));
+            mVoicemailSettings.setEnabled(false);
+            mVoicemailSettings.setIntent(null);
+
+            mVoicemailNotificationVibrate.setEnabled(false);
+        } else {
+            if (DBG) {
+                log("updateVMPreferenceWidget: provider for the key \"" + key + "\".."
+                        + "name: " + provider.name
+                        + ", intent: " + provider.intent);
+            }
+            final String providerName = provider.name;
+            mVoicemailProviders.setSummary(providerName);
+            mVoicemailSettings.setEnabled(true);
+            mVoicemailSettings.setIntent(provider.intent);
+
+            mVoicemailNotificationVibrate.setEnabled(true);
+        }
+    }
+
+    /**
+     * Enumerates existing VM providers and puts their data into the list and populates
+     * the preference list objects with their names.
+     * In case we are called with ACTION_ADD_VOICEMAIL intent the intent may have
+     * an extra string called IGNORE_PROVIDER_EXTRA with "package.activityName" of the provider
+     * which should be hidden when we bring up the list of possible VM providers to choose.
+     */
+    private void initVoiceMailProviders() {
+        if (DBG) log("initVoiceMailProviders()");
+        mPerProviderSavedVMNumbers =
+                this.getApplicationContext().getSharedPreferences(
+                        VM_NUMBERS_SHARED_PREFERENCES_NAME, MODE_PRIVATE);
+
+        String providerToIgnore = null;
+        if (getIntent().getAction().equals(ACTION_ADD_VOICEMAIL)) {
+            if (getIntent().hasExtra(IGNORE_PROVIDER_EXTRA)) {
+                providerToIgnore = getIntent().getStringExtra(IGNORE_PROVIDER_EXTRA);
+            }
+            if (DBG) log("Found ACTION_ADD_VOICEMAIL. providerToIgnore=" + providerToIgnore);
+            if (providerToIgnore != null) {
+                // IGNORE_PROVIDER_EXTRA implies we want to remove the choice from the list.
+                deleteSettingsForVoicemailProvider(providerToIgnore);
+            }
+        }
+
+        mVMProvidersData.clear();
+
+        // Stick the default element which is always there
+        final String myCarrier = getString(R.string.voicemail_default);
+        mVMProvidersData.put(DEFAULT_VM_PROVIDER_KEY, new VoiceMailProvider(myCarrier, null));
+
+        // Enumerate providers
+        PackageManager pm = getPackageManager();
+        Intent intent = new Intent();
+        intent.setAction(ACTION_CONFIGURE_VOICEMAIL);
+        List<ResolveInfo> resolveInfos = pm.queryIntentActivities(intent, 0);
+        int len = resolveInfos.size() + 1; // +1 for the default choice we will insert.
+
+        // Go through the list of discovered providers populating the data map
+        // skip the provider we were instructed to ignore if there was one
+        for (int i = 0; i < resolveInfos.size(); i++) {
+            final ResolveInfo ri= resolveInfos.get(i);
+            final ActivityInfo currentActivityInfo = ri.activityInfo;
+            final String key = makeKeyForActivity(currentActivityInfo);
+            if (key.equals(providerToIgnore)) {
+                if (DBG) log("Ignoring key: " + key);
+                len--;
+                continue;
+            }
+            if (DBG) log("Loading key: " + key);
+            final String nameForDisplay = ri.loadLabel(pm).toString();
+            Intent providerIntent = new Intent();
+            providerIntent.setAction(ACTION_CONFIGURE_VOICEMAIL);
+            providerIntent.setClassName(currentActivityInfo.packageName,
+                    currentActivityInfo.name);
+            if (DBG) {
+                log("Store loaded VoiceMailProvider. key: " + key
+                        + " -> name: " + nameForDisplay + ", intent: " + providerIntent);
+            }
+            mVMProvidersData.put(
+                    key,
+                    new VoiceMailProvider(nameForDisplay, providerIntent));
+
+        }
+
+        // Now we know which providers to display - create entries and values array for
+        // the list preference
+        String [] entries = new String [len];
+        String [] values = new String [len];
+        entries[0] = myCarrier;
+        values[0] = DEFAULT_VM_PROVIDER_KEY;
+        int entryIdx = 1;
+        for (int i = 0; i < resolveInfos.size(); i++) {
+            final String key = makeKeyForActivity(resolveInfos.get(i).activityInfo);
+            if (!mVMProvidersData.containsKey(key)) {
+                continue;
+            }
+            entries[entryIdx] = mVMProvidersData.get(key).name;
+            values[entryIdx] = key;
+            entryIdx++;
+        }
+
+        // ListPreference is now updated.
+        mVoicemailProviders.setEntries(entries);
+        mVoicemailProviders.setEntryValues(values);
+
+        // Remember the current Voicemail Provider key as a "previous" key. This will be used
+        // when we fail to update Voicemail Provider, which requires rollback.
+        // We will update this when the VM Provider setting is successfully updated.
+        mPreviousVMProviderKey = getCurrentVoicemailProviderKey();
+        if (DBG) log("Set up the first mPreviousVMProviderKey: " + mPreviousVMProviderKey);
+
+        // Finally update the preference texts.
+        updateVMPreferenceWidgets(mPreviousVMProviderKey);
+    }
+
+    private String makeKeyForActivity(ActivityInfo ai) {
+        return ai.name;
+    }
+
+    /**
+     * Simulates user clicking on a passed preference.
+     * Usually needed when the preference is a dialog preference and we want to invoke
+     * a dialog for this preference programmatically.
+     * TODO(iliat): figure out if there is a cleaner way to cause preference dlg to come up
+     */
+    private void simulatePreferenceClick(Preference preference) {
+        // Go through settings until we find our setting
+        // and then simulate a click on it to bring up the dialog
+        final ListAdapter adapter = getPreferenceScreen().getRootAdapter();
+        for (int idx = 0; idx < adapter.getCount(); idx++) {
+            if (adapter.getItem(idx) == preference) {
+                getPreferenceScreen().onItemClick(this.getListView(),
+                        null, idx, adapter.getItemId(idx));
+                break;
+            }
+        }
+    }
+
+    /**
+     * Saves new VM provider settings associating them with the currently selected
+     * provider if settings are different than the ones already stored for this
+     * provider.
+     * Later on these will be used when the user switches a provider.
+     */
+    private void maybeSaveSettingsForVoicemailProvider(String key,
+            VoiceMailProviderSettings newSettings) {
+        if (mVoicemailProviders == null) {
+            return;
+        }
+        final VoiceMailProviderSettings curSettings = loadSettingsForVoiceMailProvider(key);
+        if (newSettings.equals(curSettings)) {
+            if (DBG) {
+                log("maybeSaveSettingsForVoicemailProvider:"
+                        + " Not saving setting for " + key + " since they have not changed");
+            }
+            return;
+        }
+        if (DBG) log("Saving settings for " + key + ": " + newSettings.toString());
+        Editor editor = mPerProviderSavedVMNumbers.edit();
+        editor.putString(key + VM_NUMBER_TAG, newSettings.voicemailNumber);
+        String fwdKey = key + FWD_SETTINGS_TAG;
+        CallForwardInfo[] s = newSettings.forwardingSettings;
+        if (s != FWD_SETTINGS_DONT_TOUCH) {
+            editor.putInt(fwdKey + FWD_SETTINGS_LENGTH_TAG, s.length);
+            for (int i = 0; i < s.length; i++) {
+                final String settingKey = fwdKey + FWD_SETTING_TAG + String.valueOf(i);
+                final CallForwardInfo fi = s[i];
+                editor.putInt(settingKey + FWD_SETTING_STATUS, fi.status);
+                editor.putInt(settingKey + FWD_SETTING_REASON, fi.reason);
+                editor.putString(settingKey + FWD_SETTING_NUMBER, fi.number);
+                editor.putInt(settingKey + FWD_SETTING_TIME, fi.timeSeconds);
+            }
+        } else {
+            editor.putInt(fwdKey + FWD_SETTINGS_LENGTH_TAG, 0);
+        }
+        editor.apply();
+    }
+
+    /**
+     * Returns settings previously stored for the currently selected
+     * voice mail provider. If none is stored returns null.
+     * If the user switches to a voice mail provider and we have settings
+     * stored for it we will automatically change the phone's voice mail number
+     * and forwarding number to the stored one. Otherwise we will bring up provider's configuration
+     * UI.
+     */
+    private VoiceMailProviderSettings loadSettingsForVoiceMailProvider(String key) {
+        final String vmNumberSetting = mPerProviderSavedVMNumbers.getString(key + VM_NUMBER_TAG,
+                null);
+        if (vmNumberSetting == null) {
+            Log.w(LOG_TAG, "VoiceMailProvider settings for the key \"" + key + "\""
+                    + " was not found. Returning null.");
+            return null;
+        }
+
+        CallForwardInfo[] cfi = FWD_SETTINGS_DONT_TOUCH;
+        String fwdKey = key + FWD_SETTINGS_TAG;
+        final int fwdLen = mPerProviderSavedVMNumbers.getInt(fwdKey + FWD_SETTINGS_LENGTH_TAG, 0);
+        if (fwdLen > 0) {
+            cfi = new CallForwardInfo[fwdLen];
+            for (int i = 0; i < cfi.length; i++) {
+                final String settingKey = fwdKey + FWD_SETTING_TAG + String.valueOf(i);
+                cfi[i] = new CallForwardInfo();
+                cfi[i].status = mPerProviderSavedVMNumbers.getInt(
+                        settingKey + FWD_SETTING_STATUS, 0);
+                cfi[i].reason = mPerProviderSavedVMNumbers.getInt(
+                        settingKey + FWD_SETTING_REASON,
+                        CommandsInterface.CF_REASON_ALL_CONDITIONAL);
+                cfi[i].serviceClass = CommandsInterface.SERVICE_CLASS_VOICE;
+                cfi[i].toa = PhoneNumberUtils.TOA_International;
+                cfi[i].number = mPerProviderSavedVMNumbers.getString(
+                        settingKey + FWD_SETTING_NUMBER, "");
+                cfi[i].timeSeconds = mPerProviderSavedVMNumbers.getInt(
+                        settingKey + FWD_SETTING_TIME, 20);
+            }
+        }
+
+        VoiceMailProviderSettings settings =  new VoiceMailProviderSettings(vmNumberSetting, cfi);
+        if (DBG) log("Loaded settings for " + key + ": " + settings.toString());
+        return settings;
+    }
+
+    /**
+     * Deletes settings for the specified provider.
+     */
+    private void deleteSettingsForVoicemailProvider(String key) {
+        if (DBG) log("Deleting settings for" + key);
+        if (mVoicemailProviders == null) {
+            return;
+        }
+        mPerProviderSavedVMNumbers.edit()
+            .putString(key + VM_NUMBER_TAG, null)
+            .putInt(key + FWD_SETTINGS_TAG + FWD_SETTINGS_LENGTH_TAG, 0)
+            .commit();
+    }
+
+    private String getCurrentVoicemailProviderKey() {
+        final String key = mVoicemailProviders.getValue();
+        return (key != null) ? key : DEFAULT_VM_PROVIDER_KEY;
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        final int itemId = item.getItemId();
+        if (itemId == android.R.id.home) {  // See ActionBar#setDisplayHomeAsUpEnabled()
+            Intent intent = new Intent();
+            intent.setClassName(UP_ACTIVITY_PACKAGE, UP_ACTIVITY_CLASS);
+            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
+            startActivity(intent);
+            finish();
+            return true;
+        }
+        return super.onOptionsItemSelected(item);
+    }
+
+    /**
+     * Finish current Activity and go up to the top level Settings ({@link CallFeaturesSetting}).
+     * This is useful for implementing "HomeAsUp" capability for second-level Settings.
+     */
+    public static void goUpToTopLevelSetting(Activity activity) {
+        Intent intent = new Intent(activity, CallFeaturesSetting.class);
+        intent.setAction(Intent.ACTION_MAIN);
+        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
+        activity.startActivity(intent);
+        activity.finish();
+    }
+}