FileDocCategorySizeDatePackage
MediaAppWidgetProvider.javaAPI DocAndroid 1.5 API8337Wed May 06 22:42:46 BST 2009com.android.music

MediaAppWidgetProvider

public class MediaAppWidgetProvider extends android.appwidget.AppWidgetProvider
Simple widget to show currently playing album art along with play/pause and next track buttons.

Fields Summary
static final String
TAG
public static final String
CMDAPPWIDGETUPDATE
static final android.content.ComponentName
THIS_APPWIDGET
private static MediaAppWidgetProvider
sInstance
Constructors Summary
Methods Summary
private voiddefaultAppWidget(android.content.Context context, int[] appWidgetIds)
Initialize given widgets to default state, where we launch Music on default click and hide actions if service not running.

        final Resources res = context.getResources();
        final RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.album_appwidget);
        
        views.setViewVisibility(R.id.title, View.GONE);
        views.setTextViewText(R.id.artist, res.getText(R.string.emptyplaylist));

        linkButtons(context, views, false /* not playing */);
        pushUpdate(context, appWidgetIds, views);
static synchronized com.android.music.MediaAppWidgetProvidergetInstance()

    
        
        if (sInstance == null) {
            sInstance = new MediaAppWidgetProvider();
        }
        return sInstance;
private booleanhasInstances(android.content.Context context)
Check against {@link AppWidgetManager} if there are any instances of this widget.

        AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
        int[] appWidgetIds = appWidgetManager.getAppWidgetIds(THIS_APPWIDGET);
        return (appWidgetIds.length > 0);
private voidlinkButtons(android.content.Context context, android.widget.RemoteViews views, boolean playerActive)
Link up various button actions using {@link PendingIntents}.

param
playerActive True if player is active in background, which means widget click will launch {@link MediaPlaybackActivity}, otherwise we launch {@link MusicBrowserActivity}.

        // Connect up various buttons and touch events
        Intent intent;
        PendingIntent pendingIntent;
        
        final ComponentName serviceName = new ComponentName(context, MediaPlaybackService.class);
        
        if (playerActive) {
            intent = new Intent(context, MediaPlaybackActivity.class);
            pendingIntent = PendingIntent.getActivity(context,
                    0 /* no requestCode */, intent, 0 /* no flags */);
            views.setOnClickPendingIntent(R.id.album_appwidget, pendingIntent);
        } else {
            intent = new Intent(context, MusicBrowserActivity.class);
            pendingIntent = PendingIntent.getActivity(context,
                    0 /* no requestCode */, intent, 0 /* no flags */);
            views.setOnClickPendingIntent(R.id.album_appwidget, pendingIntent);
        }
        
        intent = new Intent(MediaPlaybackService.TOGGLEPAUSE_ACTION);
        intent.setComponent(serviceName);
        pendingIntent = PendingIntent.getService(context,
                0 /* no requestCode */, intent, 0 /* no flags */);
        views.setOnClickPendingIntent(R.id.control_play, pendingIntent);
        
        intent = new Intent(MediaPlaybackService.NEXT_ACTION);
        intent.setComponent(serviceName);
        pendingIntent = PendingIntent.getService(context,
                0 /* no requestCode */, intent, 0 /* no flags */);
        views.setOnClickPendingIntent(R.id.control_next, pendingIntent);
voidnotifyChange(MediaPlaybackService service, java.lang.String what)
Handle a change notification coming over from {@link MediaPlaybackService}

        if (hasInstances(service)) {
            if (MediaPlaybackService.PLAYBACK_COMPLETE.equals(what) ||
                    MediaPlaybackService.META_CHANGED.equals(what) ||
                    MediaPlaybackService.PLAYSTATE_CHANGED.equals(what)) {
                performUpdate(service, null);
            }
        }
public voidonUpdate(android.content.Context context, android.appwidget.AppWidgetManager appWidgetManager, int[] appWidgetIds)

        defaultAppWidget(context, appWidgetIds);
        
        // Send broadcast intent to any running MediaPlaybackService so it can
        // wrap around with an immediate update.
        Intent updateIntent = new Intent(MediaPlaybackService.SERVICECMD);
        updateIntent.putExtra(MediaPlaybackService.CMDNAME,
                MediaAppWidgetProvider.CMDAPPWIDGETUPDATE);
        updateIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, appWidgetIds);
        updateIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
        context.sendBroadcast(updateIntent);
voidperformUpdate(MediaPlaybackService service, int[] appWidgetIds)
Update all active widget instances by pushing changes

        final Resources res = service.getResources();
        final RemoteViews views = new RemoteViews(service.getPackageName(), R.layout.album_appwidget);
        
        final int track = service.getQueuePosition() + 1;
        CharSequence titleName = service.getTrackName();
        CharSequence artistName = service.getArtistName();
        CharSequence errorState = null;
        
        // Format title string with track number, or show SD card message
        String status = Environment.getExternalStorageState();
        if (status.equals(Environment.MEDIA_SHARED) ||
                status.equals(Environment.MEDIA_UNMOUNTED)) {
            errorState = res.getText(R.string.sdcard_busy_title);
        } else if (status.equals(Environment.MEDIA_REMOVED)) {
            errorState = res.getText(R.string.sdcard_missing_title);
        } else if (titleName == null) {
            errorState = res.getText(R.string.emptyplaylist);
        }
        
        if (errorState != null) {
            // Show error state to user
            views.setViewVisibility(R.id.title, View.GONE);
            views.setTextViewText(R.id.artist, errorState);
            
        } else {
            // No error, so show normal titles
            views.setViewVisibility(R.id.title, View.VISIBLE);
            views.setTextViewText(R.id.title, titleName);
            views.setTextViewText(R.id.artist, artistName);
        }
        
        // Set correct drawable for pause state
        final boolean playing = service.isPlaying();
        if (playing) {
            views.setImageViewResource(R.id.control_play, R.drawable.appwidget_pause);
        } else {
            views.setImageViewResource(R.id.control_play, R.drawable.appwidget_play);
        }

        // Link actions buttons to intents
        linkButtons(service, views, playing);
        
        pushUpdate(service, appWidgetIds, views);
private voidpushUpdate(android.content.Context context, int[] appWidgetIds, android.widget.RemoteViews views)

        // Update specific list of appWidgetIds if given, otherwise default to all
        final AppWidgetManager gm = AppWidgetManager.getInstance(context);
        if (appWidgetIds != null) {
            gm.updateAppWidget(appWidgetIds, views);
        } else {
            gm.updateAppWidget(THIS_APPWIDGET, views);
        }