src/com/android/settings/ApnSettings.java

/*
 * 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.settings;

import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.ContentResolver;
import android.content.ContentUris;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Looper;
import android.os.Message;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.preference.PreferenceGroup;
import android.preference.PreferenceScreen;
import android.provider.Telephony;
import android.text.TextUtils;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

public class ApnSettings extends PreferenceActivity {

    public static final String EXTRA_POSITION = "position";
    public static final String RESTORE_CARRIERS_URI =
        "content://telephony/carriers/restore";

    private static final int ID_INDEX = 0;
    private static final int NAME_INDEX = 1;
    private static final int APN_INDEX = 2;

    private static final int MENU_NEW = Menu.FIRST;
    private static final int MENU_RESTORE = Menu.FIRST + 1;

    private static final int EVENT_RESTORE_DEFAULTAPN_START = 1;
    private static final int EVENT_RESTORE_DEFAULTAPN_COMPLETE = 2;

    private static final int DIALOG_RESTORE_DEFAULTAPN = 1001;

    private static final Uri DEFAULTAPN_URI = Uri.parse(RESTORE_CARRIERS_URI);

    private static boolean mRestoreDefaultApnMode;

    private RestoreApnUiHandler mRestoreApnUiHandler;
    private RestoreApnProcessHandler mRestoreApnProcessHandler;

    private Cursor mCursor;

    @Override
    protected void onCreate(Bundle icicle) {
        super.onCreate(icicle);

        addPreferencesFromResource(R.xml.apn_settings);
    }

    @Override
    protected void onResume() {
        super.onResume();

        if (!mRestoreDefaultApnMode) {
            fillList();
        } else {
            showDialog(DIALOG_RESTORE_DEFAULTAPN);
        }
    }

    private void fillList() {
        mCursor = managedQuery(Telephony.Carriers.CONTENT_URI, new String[] {
                "_id", "name", "apn"}, null, Telephony.Carriers.DEFAULT_SORT_ORDER);

        PreferenceGroup apnList = (PreferenceGroup) findPreference("apn_list");
        apnList.removeAll();

        mCursor.moveToFirst();
        while (!mCursor.isAfterLast()) {
            String name = mCursor.getString(NAME_INDEX);
            String apn = mCursor.getString(APN_INDEX);

            if (name != null && apn != null && TextUtils.getTrimmedLength(name) > 0
                    && TextUtils.getTrimmedLength(apn) > 0) {
                Preference pref = new Preference((Context) this);
                pref.setKey(mCursor.getString(ID_INDEX));
                pref.setTitle(name);
                pref.setSummary(apn);
                pref.setPersistent(false);
                apnList.addPreference(pref);
            }

            mCursor.moveToNext();
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        menu.add(0, MENU_NEW, 0,
                getResources().getString(R.string.menu_new))
                .setIcon(android.R.drawable.ic_menu_add);
        menu.add(0, MENU_RESTORE, 0,
                getResources().getString(R.string.menu_restore))
                .setIcon(android.R.drawable.ic_menu_upload);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case MENU_NEW:
            addNewApn();
            return true;

        case MENU_RESTORE:
            restoreDefaultApn();
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    private void addNewApn() {
        startActivity(new Intent(Intent.ACTION_INSERT, Telephony.Carriers.CONTENT_URI));
    }

    @Override
    public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
        int pos = Integer.parseInt(preference.getKey());
        Uri url = ContentUris.withAppendedId(Telephony.Carriers.CONTENT_URI, pos);
        startActivity(new Intent(Intent.ACTION_EDIT, url));
        return true;
    }

    private boolean restoreDefaultApn() {
        showDialog(DIALOG_RESTORE_DEFAULTAPN);
        mRestoreDefaultApnMode = true;

        if (mRestoreApnUiHandler == null) {
            mRestoreApnUiHandler = new RestoreApnUiHandler();
        }

        if (mRestoreApnProcessHandler == null) {
            HandlerThread restoreDefaultApnThread = new HandlerThread(
                    "Restore default APN Handler: Process Thread");
            restoreDefaultApnThread.start();
            mRestoreApnProcessHandler = new RestoreApnProcessHandler(
                    restoreDefaultApnThread.getLooper(), mRestoreApnUiHandler);
        }

        mRestoreApnProcessHandler
                .sendEmptyMessage(EVENT_RESTORE_DEFAULTAPN_START);
        return true;
    }

    private class RestoreApnUiHandler extends Handler {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case EVENT_RESTORE_DEFAULTAPN_COMPLETE:
                    fillList();
                    getPreferenceScreen().setEnabled(true);
                    mRestoreDefaultApnMode = false;
                    dismissDialog(DIALOG_RESTORE_DEFAULTAPN);
                    Toast.makeText(
                        ApnSettings.this,
                        getResources().getString(
                                R.string.restore_default_apn_completed),
                        Toast.LENGTH_LONG).show();
                    break;
            }
        }
    }

    private class RestoreApnProcessHandler extends Handler {
        private Handler mRestoreApnUiHandler;

        public RestoreApnProcessHandler(Looper looper, Handler restoreApnUiHandler) {
            super(looper);
            this.mRestoreApnUiHandler = restoreApnUiHandler;
        }

        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case EVENT_RESTORE_DEFAULTAPN_START:
                    ContentResolver resolver = getContentResolver();
                    resolver.delete(DEFAULTAPN_URI, null, null);                    
                    mRestoreApnUiHandler
                        .sendEmptyMessage(EVENT_RESTORE_DEFAULTAPN_COMPLETE);
                    break;
            }
        }
    }

    @Override
    protected Dialog onCreateDialog(int id) {
        if (id == DIALOG_RESTORE_DEFAULTAPN) {
            ProgressDialog dialog = new ProgressDialog(this);
            dialog.setMessage(getResources().getString(R.string.restore_default_apn));
            dialog.setCancelable(false);
            return dialog;
        }
        return null;
    }

    @Override
    protected void onPrepareDialog(int id, Dialog dialog) {
        if (id == DIALOG_RESTORE_DEFAULTAPN) {
            getPreferenceScreen().setEnabled(false);
        }
    }
}