Add code to show a message when a conference merge fails.

Right now the plumbing only exists for VoLTE conference calls
and GSM/CDMA calls behave as they did before. While making
this change, it made a lot of sense to rename CdmaDisplayInfo
to PhoneDisplayMessage.

Bug: 18080792
Change-Id: If8c8cf9a234371bdb2798c9d1e80d56b3aaf84f8
diff --git a/src/com/android/phone/PhoneDisplayMessage.java b/src/com/android/phone/PhoneDisplayMessage.java
new file mode 100644
index 0000000..2b86a61
--- /dev/null
+++ b/src/com/android/phone/PhoneDisplayMessage.java
@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 2009 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.AlertDialog;
+import android.content.Context;
+import android.os.SystemProperties;
+import android.util.Log;
+import android.view.WindowManager;
+
+/**
+ * Helper class for displaying the a string triggered by a lower level Phone request
+ */
+public class PhoneDisplayMessage {
+    private static final String LOG_TAG = "PhoneDisplayMessage";
+    private static final boolean DBG = (SystemProperties.getInt("ro.debuggable", 0) == 1);
+
+    /** Display message dialog */
+    private static AlertDialog sDisplayMessageDialog = null;
+
+    /**
+     * Display the alert dialog with the network message.
+     *
+     * @param context context to get strings.
+     * @param infoMsg Text message from Network.
+     */
+    public static void displayNetworkMessage(Context context, String infoMsg) {
+        if (DBG) log("displayInfoRecord: infoMsg=" + infoMsg);
+
+        String title = (String)context.getText(R.string.network_info_message);
+        displayMessage(context, title, infoMsg);
+    }
+
+    /**
+     * Display the alert dialog with the error message.
+     *
+     * @param context context to get strings.
+     * @param errorMsg Error message describing the network triggered error
+     */
+    public static void displayErrorMessage(Context context, String errorMsg) {
+        if (DBG) log("displayErrorMessage: errorMsg=" + errorMsg);
+
+        String title = (String)context.getText(R.string.network_error_message);
+        displayMessage(context, title, errorMsg);
+    }
+
+    public static void displayMessage(Context context, String title, String msg) {
+        if (DBG) log("displayMessage: msg=" + msg);
+
+        if (sDisplayMessageDialog != null) {
+            sDisplayMessageDialog.dismiss();
+        }
+
+        // displaying system alert dialog on the screen instead of
+        // using another activity to display the message.  This
+        // places the message at the forefront of the UI.
+        sDisplayMessageDialog = new AlertDialog.Builder(context)
+                .setIcon(android.R.drawable.ic_dialog_info)
+                .setTitle(title)
+                .setMessage(msg)
+                .setCancelable(true)
+                .create();
+
+        sDisplayMessageDialog.getWindow().setType(
+                WindowManager.LayoutParams.TYPE_SYSTEM_DIALOG);
+        sDisplayMessageDialog.getWindow().addFlags(
+                WindowManager.LayoutParams.FLAG_DIM_BEHIND);
+
+        sDisplayMessageDialog.show();
+        PhoneGlobals.getInstance().wakeUpScreen();
+    }
+
+    /**
+     * Dismiss the DisplayInfo record
+     */
+    public static void dismissMessage() {
+        if (DBG) log("Dissmissing Display Info Record...");
+
+        if (sDisplayMessageDialog != null) {
+            sDisplayMessageDialog.dismiss();
+            sDisplayMessageDialog = null;
+        }
+    }
+
+    private static void log(String msg) {
+        Log.d(LOG_TAG, "[PhoneDisplayMessage] " + msg);
+    }
+}