Android 小部件在一段时间后停止工作？

Question

我有一个带小部件的手电筒应用程序。该小部件用于打开和关闭手电筒，不显示主要 Activity 或任何内容。然而，几个小时后，小部件什么也不做。我的意思是，如果您单击它，什么也不会发生。 我有两个类来完成这个Provider和Receiver。

提供者:

public class WidgetProvider extends AppWidgetProvider {

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

    Intent receiver = new Intent(context, FlashlightWidgetReceiver.class);
    receiver.setAction("COM_FLASHLIGHT");
    receiver.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, appWidgetIds);
    PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, receiver, 0);

    RemoteViews views = new RemoteViews(context.getPackageName(),
      R.layout.appwidget_layout);
    views.setOnClickPendingIntent(R.id.imageButton, pendingIntent);

    appWidgetManager.updateAppWidget(appWidgetIds, views);

  }
}

接收者:

public class FlashlightWidgetReceiver extends BroadcastReceiver {
  private static boolean isLightOn = false;
  private static Camera camera;
  MediaPlayer mp;@
  Override
  public void onReceive(Context context, Intent intent) {
    RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.appwidget_layout);

    if (isLightOn) {
      views.setImageViewResource(R.id.imageButton, R.drawable.btn_switch_off);
      mp = MediaPlayer.create(context, R.raw.light_switch_off);
    } else {
      views.setImageViewResource(R.id.imageButton, R.drawable.btn_switch_on);
      mp = MediaPlayer.create(context, R.raw.light_switch_on);
    }
    mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {

      @
      Override
      public void onCompletion(MediaPlayer mp) {
        // TODO Auto-generated method stub
        mp.release();
      }
    });
    mp.start();
    AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
    appWidgetManager.updateAppWidget(new ComponentName(context, WidgetProvider.class),
      views);

    if (isLightOn) {
      if (camera != null) {
        camera.stopPreview();
        camera.release();
        camera = null;
        isLightOn = false;
      }

    } else {
      camera = Camera.open();

      if (camera == null) {
        Toast.makeText(context, "No Camera!", Toast.LENGTH_SHORT).show();
      } else {
        Camera.Parameters param = camera.getParameters();
        param.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
        try {
          camera.setParameters(param);
          camera.startPreview();
          isLightOn = true;
        } catch (Exception e) {
          Toast.makeText(context, "No Flash!", Toast.LENGTH_SHORT).show();
        }
      }
    }
  }
}

设置:

<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
    android:minWidth="40dp"
    android:minHeight="40dp"
    android:maxWidth="40dp"
    android:maxHeight="40dp"
    android:updatePeriodMillis="86400000"
    android:initialLayout="@layout/appwidget_layout"
    android:resizeMode="horizontal|vertical">
</appwidget-provider>

更新:减少更新间隔会使小部件更频繁地刷新，因此如果它卡住，它会在 30 分钟后再次运行，然后它可能会在某个时候再次卡住。

更新 2:更改日期会立即卡住小部件，直到它被刷新。

更新 3:更改日期会以某种方式重新启动启动器，并且每当启动器重新启动时，小部件都会卡住 30 分钟。

Answer 1

找这个帖子，我想这个问题在这里解释了the dark side of app widgets