1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.calculator2; 18 19 import android.app.Activity; 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 import android.support.annotation.Nullable; 27 import android.support.annotation.StringRes; 28 import android.view.LayoutInflater; 29 import android.widget.TextView; 30 31 /** 32 * Display a message with a dismiss putton, and optionally a second button. 33 */ 34 public class AlertDialogFragment extends DialogFragment implements DialogInterface.OnClickListener { 35 36 public interface OnClickListener { 37 /** 38 * This method will be invoked when a button in the dialog is clicked. 39 * 40 * @param fragment the AlertDialogFragment that received the click 41 * @param which the button that was clicked (e.g. 42 * {@link DialogInterface#BUTTON_POSITIVE}) or the position 43 * of the item clicked 44 */ onClick(AlertDialogFragment fragment, int which)45 void onClick(AlertDialogFragment fragment, int which); 46 } 47 48 private static final String NAME = AlertDialogFragment.class.getName(); 49 private static final String KEY_MESSAGE = NAME + "_message"; 50 private static final String KEY_BUTTON_NEGATIVE = NAME + "_button_negative"; 51 private static final String KEY_BUTTON_POSITIVE = NAME + "_button_positive"; 52 private static final String KEY_TITLE = NAME + "_title"; 53 54 /** 55 * Convenience method for creating and showing a DialogFragment with the given message and 56 * title. 57 * 58 * @param activity originating Activity 59 * @param title resource id for the title string 60 * @param message resource id for the displayed message string 61 * @param positiveButtonLabel label for second button, if any. If non-null, activity must 62 * implement AlertDialogFragment.OnClickListener to respond. 63 */ showMessageDialog(Activity activity, @StringRes int title, @StringRes int message, @StringRes int positiveButtonLabel, @Nullable String tag)64 public static void showMessageDialog(Activity activity, @StringRes int title, 65 @StringRes int message, @StringRes int positiveButtonLabel, @Nullable String tag) { 66 showMessageDialog(activity, title != 0 ? activity.getString(title) : null, 67 activity.getString(message), 68 positiveButtonLabel != 0 ? activity.getString(positiveButtonLabel) : null, 69 tag); 70 } 71 72 /** 73 * Create and show a DialogFragment with the given message. 74 * 75 * @param activity originating Activity 76 * @param title displayed title, if any 77 * @param message displayed message 78 * @param positiveButtonLabel label for second button, if any. If non-null, activity must 79 * implement AlertDialogFragment.OnClickListener to respond. 80 */ showMessageDialog(Activity activity, @Nullable CharSequence title, CharSequence message, @Nullable CharSequence positiveButtonLabel, @Nullable String tag)81 public static void showMessageDialog(Activity activity, @Nullable CharSequence title, 82 CharSequence message, @Nullable CharSequence positiveButtonLabel, @Nullable String tag) 83 { 84 final FragmentManager manager = activity.getFragmentManager(); 85 if (manager == null || manager.isDestroyed()) { 86 return; 87 } 88 final AlertDialogFragment dialogFragment = new AlertDialogFragment(); 89 final Bundle args = new Bundle(); 90 args.putCharSequence(KEY_MESSAGE, message); 91 args.putCharSequence(KEY_BUTTON_NEGATIVE, activity.getString(R.string.dismiss)); 92 if (positiveButtonLabel != null) { 93 args.putCharSequence(KEY_BUTTON_POSITIVE, positiveButtonLabel); 94 } 95 args.putCharSequence(KEY_TITLE, title); 96 dialogFragment.setArguments(args); 97 dialogFragment.show(manager, tag /* tag */); 98 } 99 AlertDialogFragment()100 public AlertDialogFragment() { 101 setStyle(STYLE_NO_TITLE, android.R.attr.alertDialogTheme); 102 } 103 104 @Override onCreateDialog(Bundle savedInstanceState)105 public Dialog onCreateDialog(Bundle savedInstanceState) { 106 final Bundle args = getArguments() == null ? Bundle.EMPTY : getArguments(); 107 final AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()); 108 109 final LayoutInflater inflater = LayoutInflater.from(builder.getContext()); 110 final TextView messageView = (TextView) inflater.inflate( 111 R.layout.dialog_message, null /* root */); 112 messageView.setText(args.getCharSequence(KEY_MESSAGE)); 113 builder.setView(messageView); 114 115 builder.setNegativeButton(args.getCharSequence(KEY_BUTTON_NEGATIVE), null /* listener */); 116 117 final CharSequence positiveButtonLabel = args.getCharSequence(KEY_BUTTON_POSITIVE); 118 if (positiveButtonLabel != null) { 119 builder.setPositiveButton(positiveButtonLabel, this); 120 } 121 122 builder.setTitle(args.getCharSequence(KEY_TITLE)); 123 124 return builder.create(); 125 } 126 127 @Override onClick(DialogInterface dialog, int which)128 public void onClick(DialogInterface dialog, int which) { 129 final Activity activity = getActivity(); 130 if (activity instanceof AlertDialogFragment.OnClickListener /* always true */) { 131 ((AlertDialogFragment.OnClickListener) activity).onClick(this, which); 132 } 133 } 134 } 135