小部件和多个未决 Intent 的 Android 问题

Question

我正在开发一个控制媒体播放器服务的小部件。我的小部件上有 4 个按钮:

• 上一个
• 播放/暂停
• 停止
• 转发

这四个按钮被分配了一个挂起的 Intent ，它向播放器服务发送一个广播，其中包含作为额外内容的所需操作。

我遇到的问题是，当我将待定 Intent 分配给如下按钮时，它们似乎都具有相同的广播值。例如，在下面的代码中，所有 4 个按钮似乎都发送 Globals.PlaybackActions.SKIP_FORWARD。但是，如果我注释掉分配“播放”按钮以外的未决 Intent 的代码，则按下“播放”会广播正确的值。

在使用多个未决 Intent 作为小部件上的广播时，是否有我没有意识到的事情，或者我是否在我的代码中犯了一个我无法发现的愚蠢错误？还是 secret 选项 C？

我绝望地迷失和困惑，非常感谢任何帮助。谢谢。

    public class PlayerWidget extends AppWidgetProvider {

        private boolean serviceIsPlaying = false;

        private PendingIntent pendingIntentPrev = null;
        private PendingIntent pendingIntentNext = null;
        private PendingIntent pendingIntentStop = null;
        private PendingIntent pendingIntentPlay = null;

        public void onReceive(Context context, Intent intent) {
            if (!intent.getAction().equals(Globals.BROADCAST_WIDGET_UPDATE)) {
                return;
            }

            AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
            ComponentName thisAppWidget = new ComponentName(context.getPackageName(), PlayerWidget.class.getName());
            int[] appWidgetIds = appWidgetManager.getAppWidgetIds(thisAppWidget);

            this.updateViews(context, appWidgetManager, appWidgetIds);
        }

        private void updateViews(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds){
            RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.widget_player);

            this.setClickIntents(context);

            if (this.serviceIsPlaying) { 
                remoteViews.setImageViewResource(R.id.btnPlay, R.drawable.ic_action_pause); 
                }
            else { 
                remoteViews.setImageViewResource(R.id.btnPlay, R.drawable.ic_action_play); 
            }

            remoteViews.setTextViewText(R.id.txtArtistName, currentTrack.getArtistName());
            remoteViews.setTextViewText(R.id.txtSongName, currentTrack.getSongTitle());
            remoteViews.setTextViewText(R.id.txtAlbumName, currentTrack.getAlbumName());
            remoteViews.setImageViewBitmap(R.id.imgAlbumArt, BitmapFactory.decodeFile(currentTrack.getAlbumArtPath()));

            remoteViews.setOnClickPendingIntent(R.id.btnPrev, pendingIntentPrev);
            remoteViews.setOnClickPendingIntent(R.id.btnNext, pendingIntentNext);
            remoteViews.setOnClickPendingIntent(R.id.btnStop, pendingIntentStop);
            remoteViews.setOnClickPendingIntent(R.id.btnPlay, pendingIntentPlay);

            appWidgetManager.updateAppWidget(appWidgetIds, remoteViews);
        }

        private void setClickIntents(Context context) {
            Intent intentPrev = new Intent(Globals.BROADCAST_PLAYBACK_ACTION);
            Intent intentNext = new Intent(Globals.BROADCAST_PLAYBACK_ACTION);
            Intent intentStop = new Intent(Globals.BROADCAST_PLAYBACK_ACTION);
            Intent intentPlay = new Intent(Globals.BROADCAST_PLAYBACK_ACTION);

            intentPrev.putExtra(Globals.EXTRA_PLAYBACK_ACTION, Globals.PlaybackActions.SKIP_BACKWARD);
            intentNext.putExtra(Globals.EXTRA_PLAYBACK_ACTION, Globals.PlaybackActions.SKIP_FORWARD);
            intentStop.putExtra(Globals.EXTRA_PLAYBACK_ACTION, Globals.PlaybackActions.STOP);

            if (this.serviceIsPlaying) {
                intentPlay.putExtra(Globals.EXTRA_PLAYBACK_ACTION, Globals.PlaybackActions.PAUSE);
            }
            else {
                intentPlay.putExtra(Globals.EXTRA_PLAYBACK_ACTION, Globals.PlaybackActions.PLAY);
            }

            pendingIntentPrev = PendingIntent.getBroadcast(context, 0, intentPrev, 0);
            pendingIntentNext = PendingIntent.getBroadcast(context, 0, intentNext, 0);
            pendingIntentStop = PendingIntent.getBroadcast(context, 0, intentStop, 0);
            pendingIntentPlay = PendingIntent.getBroadcast(context, 0, intentPlay, 0);
        }
    }

Answer 1

我认为问题出在 PendingIntent.getBroadcast() 方法中的第二个参数。第二个参数是 requestCode，它对于您正在使用的所有 4 个 PendingIntent-s 应该是不同的。例如:

pendingIntentPrev = PendingIntent.getBroadcast(context, 0, intentPrev, 0);
pendingIntentNext = PendingIntent.getBroadcast(context, 1, intentNext, 0);
pendingIntentStop = PendingIntent.getBroadcast(context, 2, intentStop, 0);
pendingIntentPlay = PendingIntent.getBroadcast(context, 3, intentPlay, 0);

几天前我遇到了同样的问题，这对我有帮助。希望对您也有帮助。