MediaAppWidgetProvider.java revision 490384bf1b81cc703fd42de8674e593b216e3435 
1/*
2 * Copyright (C) 2009 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
17package com.android.music;
18
19import android.app.PendingIntent;
20import android.appwidget.AppWidgetManager;
21import android.appwidget.AppWidgetProvider;
22import android.content.BroadcastReceiver;
23import android.content.ComponentName;
24import android.content.Context;
25import android.content.Intent;
26import android.content.res.Resources;
27import android.graphics.Bitmap;
28import android.graphics.BitmapFactory;
29import android.graphics.Canvas;
30import android.graphics.Paint;
31import android.graphics.PorterDuff;
32import android.graphics.PorterDuffXfermode;
33import android.graphics.Rect;
34import android.media.MediaFile;
35import android.os.Environment;
36import android.os.SystemClock;
37import android.util.Config;
38import android.util.Log;
39import android.view.View;
40import android.widget.RemoteViews;
41
42/**
43 * Simple widget to show currently playing album art along
44 * with play/pause and next track buttons.
45 */
46public class MediaAppWidgetProvider extends AppWidgetProvider {
47    static final String TAG = "MusicAppWidgetProvider";
48
49    public static final String CMDAPPWIDGETUPDATE = "appwidgetupdate";
50
51    static final ComponentName THIS_APPWIDGET =
52        new ComponentName("com.android.music",
53                "com.android.music.MediaAppWidgetProvider");
54
55    private static MediaAppWidgetProvider sInstance;
56
57    static synchronized MediaAppWidgetProvider getInstance() {
58        if (sInstance == null) {
59            sInstance = new MediaAppWidgetProvider();
60        }
61        return sInstance;
62    }
63
64    @Override
65    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
66        defaultAppWidget(context, appWidgetIds);
67
68        // Send broadcast intent to any running MediaPlaybackService so it can
69        // wrap around with an immediate update.
70        Intent updateIntent = new Intent(MediaPlaybackService.SERVICECMD);
71        updateIntent.putExtra(MediaPlaybackService.CMDNAME,
72                MediaAppWidgetProvider.CMDAPPWIDGETUPDATE);
73        updateIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, appWidgetIds);
74        updateIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
75        context.sendBroadcast(updateIntent);
76    }
77
78    /**
79     * Initialize given widgets to default state, where we launch Music on default click
80     * and hide actions if service not running.
81     */
82    private void defaultAppWidget(Context context, int[] appWidgetIds) {
83        final Resources res = context.getResources();
84        final RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.album_appwidget);
85
86        views.setTextViewText(R.id.title, res.getText(R.string.emptyplaylist));
87
88        linkButtons(context, views, false /* not playing */);
89        pushUpdate(context, appWidgetIds, views);
90    }
91
92    private void pushUpdate(Context context, int[] appWidgetIds, RemoteViews views) {
93        // Update specific list of appWidgetIds if given, otherwise default to all
94        final AppWidgetManager gm = AppWidgetManager.getInstance(context);
95        if (appWidgetIds != null) {
96            gm.updateAppWidget(appWidgetIds, views);
97        } else {
98            gm.updateAppWidget(THIS_APPWIDGET, views);
99        }
100    }
101
102    /**
103     * Check against {@link AppWidgetManager} if there are any instances of this widget.
104     */
105    private boolean hasInstances(Context context) {
106        AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
107        int[] appWidgetIds = appWidgetManager.getAppWidgetIds(THIS_APPWIDGET);
108        return (appWidgetIds.length > 0);
109    }
110
111    /**
112     * Handle a change notification coming over from {@link MediaPlaybackService}
113     */
114    void notifyChange(MediaPlaybackService service, String what) {
115        if (hasInstances(service)) {
116            if (MediaPlaybackService.PLAYBACK_COMPLETE.equals(what) ||
117                    MediaPlaybackService.META_CHANGED.equals(what) ||
118                    MediaPlaybackService.PLAYSTATE_CHANGED.equals(what)) {
119                performUpdate(service, null);
120            }
121        }
122    }
123
124    /**
125     * Update all active widget instances by pushing changes
126     */
127    void performUpdate(MediaPlaybackService service, int[] appWidgetIds) {
128        final Resources res = service.getResources();
129        final RemoteViews views = new RemoteViews(service.getPackageName(), R.layout.album_appwidget);
130
131        final int track = service.getQueuePosition() + 1;
132        final String titleName = service.getTrackName();
133        final String artistName = service.getArtistName();
134
135        // Format title string with track number, or show SD card message
136        CharSequence titleString = "";
137        String status = Environment.getExternalStorageState();
138        if (titleName != null) {
139            titleString = res.getString(R.string.gadget_track_num_title, track, titleName);
140        } else if (status.equals(Environment.MEDIA_SHARED) ||
141                status.equals(Environment.MEDIA_UNMOUNTED)) {
142            titleString = res.getText(R.string.sdcard_busy_title);
143        } else if (status.equals(Environment.MEDIA_REMOVED)) {
144            titleString = res.getText(R.string.sdcard_missing_title);
145        } else {
146            titleString = res.getText(R.string.emptyplaylist);
147        }
148
149        views.setTextViewText(R.id.title, titleString);
150        views.setTextViewText(R.id.artist, artistName);
151
152        // Set correct drawable for pause state
153        final boolean playing = service.isPlaying();
154        views.setImageViewResource(R.id.control_play, playing ?
155                R.drawable.appwidget_pause : R.drawable.appwidget_play);
156
157        // Link actions buttons to intents
158        linkButtons(service, views, playing);
159
160        pushUpdate(service, appWidgetIds, views);
161    }
162
163    /**
164     * Link up various button actions using {@link PendingIntents}.
165     *
166     * @param playerActive True if player is active in background, which means
167     *            widget click will launch {@link MediaPlaybackActivity},
168     *            otherwise we launch {@link MusicBrowserActivity}.
169     */
170    private void linkButtons(Context context, RemoteViews views, boolean playerActive) {
171        // Connect up various buttons and touch events
172        Intent intent;
173        PendingIntent pendingIntent;
174
175        final ComponentName serviceName = new ComponentName(context, MediaPlaybackService.class);
176
177        if (playerActive) {
178            intent = new Intent(context, MediaPlaybackActivity.class);
179            pendingIntent = PendingIntent.getActivity(context,
180                    0 /* no requestCode */, intent, 0 /* no flags */);
181            views.setOnClickPendingIntent(R.id.album_appwidget, pendingIntent);
182        } else {
183            intent = new Intent(context, MusicBrowserActivity.class);
184            pendingIntent = PendingIntent.getActivity(context,
185                    0 /* no requestCode */, intent, 0 /* no flags */);
186            views.setOnClickPendingIntent(R.id.album_appwidget, pendingIntent);
187        }
188
189        intent = new Intent(MediaPlaybackService.TOGGLEPAUSE_ACTION);
190        intent.setComponent(serviceName);
191        pendingIntent = PendingIntent.getService(context,
192                0 /* no requestCode */, intent, 0 /* no flags */);
193        views.setOnClickPendingIntent(R.id.control_play, pendingIntent);
194
195        intent = new Intent(MediaPlaybackService.NEXT_ACTION);
196        intent.setComponent(serviceName);
197        pendingIntent = PendingIntent.getService(context,
198                0 /* no requestCode */, intent, 0 /* no flags */);
199        views.setOnClickPendingIntent(R.id.control_next, pendingIntent);
200    }
201}
202