Android 音乐播放器小部件

Question

我正在开发音乐播放器小部件（主屏幕小部件）.. 它只需要播放一首歌曲，（最好使用 MediaPlayer 类）。但我不确定如何实现它。我对 Android 开发有点缺乏经验，就这么说吧。

到目前为止我的课程扩展了AppWidgetProvider，我想让这个课程处理音乐播放部分不是一个好主意，而是一个Service。如果有，怎么做？

另外，我还有3个按钮：播放、暂停和停止，我可以在onReceive(...)中分辨出哪个按钮被按下了。

提前致谢！

---

这是课程。

public class MusicManager extends AppWidgetProvider {

    private final String ACTION_WIDGET_PLAY = "PlaySong";
    private final String ACTION_WIDGET_PAUSE = "PauseSong";
    private final String ACTION_WIDGET_STOP = "StopSong";   
    private final int INTENT_FLAGS = 0;
    private final int REQUEST_CODE = 0;

    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager,
            int[] appWidgetIds) {

        RemoteViews controlButtons = new RemoteViews(context.getPackageName(),
                R.layout.main);

        Intent playIntent = new Intent(context, MusicService.class);

        Intent pauseIntent = new Intent(context, MusicService.class);

        Intent stopIntent = new Intent(context, MusicService.class);


        PendingIntent playPendingIntent = PendingIntent.getService(
                context, REQUEST_CODE, playIntent, INTENT_FLAGS);
        PendingIntent pausePendingIntent = PendingIntent.getService(
                context, REQUEST_CODE, pauseIntent, INTENT_FLAGS);
        PendingIntent stopPendingIntent = PendingIntent.getService(
                context, REQUEST_CODE, stopIntent, INTENT_FLAGS);

        controlButtons.setOnClickPendingIntent(
                R.id.btnPlay, playPendingIntent);
        controlButtons.setOnClickPendingIntent(
                R.id.btnPause, pausePendingIntent);
        controlButtons.setOnClickPendingIntent(
                R.id.btnStop, stopPendingIntent);

        appWidgetManager.updateAppWidget(appWidgetIds, controlButtons);         
    }
}

Answer 1

添加<service android:name=".MusicService" android:enabled="true" /> 到清单！

Answer 2

在AppWidgetProvider 的onUpdate(...) 方法中，使用类似这样的方法来启动服务（本示例将服务与按钮单击事件相关联）：

Intent intent = new Intent(context, MusicService.class);
PendingIntent pendingIntent = PendingIntent.getService(context, 0, intent, 0);

// Get the layout for the App Widget and attach an on-click listener to the button
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.appwidget_provider_layout);
views.setOnClickPendingIntent(R.id.button, pendingIntent);

更多信息请看here