1 /******************************************************************************* 2 * Copyright (C) 2012 Google Inc. 3 * Licensed to The Android Open Source Project. 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 *******************************************************************************/ 17 18 package com.android.mail.browse; 19 20 import android.app.AlertDialog; 21 import android.app.Dialog; 22 import android.app.DialogFragment; 23 import android.app.FragmentManager; 24 import android.content.DialogInterface; 25 import android.os.Bundle; 26 27 import com.android.mail.R; 28 import com.android.mail.ui.ControllableActivity; 29 import com.android.mail.ui.ConversationUpdater; 30 31 /** 32 * A dialog which is also a fragment. This dialog shows a message, two buttons (ok/cancel), and runs 33 * a listener only for the positive action (ok). Since this is a fragment, it is created 34 * automatically over orientation changes. To make a listener that works with this dialog, create a 35 * listener with {@link ConversationUpdater#makeDialogListener(int, boolean)}, which correctly 36 * handles activity life-cycle events. 37 */ 38 public class ConfirmDialogFragment extends DialogFragment { 39 /** Tag for saving the message shown in the dialog. */ 40 private static final String MESSAGE_KEY = "message"; 41 /** Tag for the dialog in the fragment manager. */ 42 private static final String DIALOG_TAG = "confirm-dialog"; 43 44 /** 45 * Since the fragment can be easily destroyed, get the listener from the central activity 46 * immediately after the positive button ("OK" in English) is clicked. We cannot get the 47 * listener in {@link #onActivityCreated(Bundle)} because the controller has not had a chance 48 * to create the listener yet. 49 */ 50 private final AlertDialog.OnClickListener POSITIVE_ACTION = new AlertDialog.OnClickListener() { 51 @Override 52 public void onClick(DialogInterface arg0, int arg1) { 53 // Casting to ControllableActivity will crash if it fails. This is the expected 54 // behavior, since the cast should always succeed. Cast failures only occur during 55 // development. 56 final AlertDialog.OnClickListener listener = 57 ((ControllableActivity) getActivity()).getConversationUpdater().getListener(); 58 if (listener != null) { 59 listener.onClick(arg0, arg1); 60 } 61 } 62 }; 63 64 /** 65 * Needs a public empty constructor for instantiation on orientation changes. 66 */ ConfirmDialogFragment()67 public ConfirmDialogFragment() {} 68 69 /** 70 * Create a new {@link ConfirmDialogFragment}. 71 * @param message 72 * @return new {@link ConfirmDialogFragment} object. 73 */ newInstance(CharSequence message)74 public static ConfirmDialogFragment newInstance(CharSequence message) { 75 final ConfirmDialogFragment f = new ConfirmDialogFragment(); 76 final Bundle args = new Bundle(); 77 args.putCharSequence(MESSAGE_KEY, message); 78 f.setArguments(args); 79 return f; 80 } 81 82 @Override onCreateDialog(Bundle savedState)83 public Dialog onCreateDialog(Bundle savedState) { 84 final AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()); 85 final CharSequence message = (getArguments()).getCharSequence(MESSAGE_KEY); 86 builder.setMessage(message) 87 .setPositiveButton(R.string.ok, POSITIVE_ACTION) 88 .setNegativeButton(R.string.cancel, null); 89 return builder.create(); 90 } 91 92 /** 93 * Display this dialog with the provided fragment manager 94 * @param manager 95 */ displayDialog(FragmentManager manager)96 public final void displayDialog (FragmentManager manager) { 97 show(manager, DIALOG_TAG); 98 } 99 } 100