SyncAdapter进程在从最近被刷走时被杀死

Question

我正在尝试创建SyncAdapter运行后台操作(没有前台通知)。

它正在工作，除了触发ContentResolver.requestSync(...)的活动(任务)从最近的应用程序中删除的情况。在这种情况下，进程被杀死，onPerformSync(...)未完成。

我知道，这是预期的Android行为，但在常规Service中，我会设置

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    super.onStartCommand(intent, flags, startId);
    return START_REDELIVER_INTENT;
}

或者使用

@Override
public void onTaskRemoved(Intent rootIntent) {
    super.onTaskRemoved(rootIntent);
    restartSynchronization();
}

重试同步，但这在SyncAdapterService中不起作用。

我如何确保同步继续/重试活动从最近的应用程序滑走后?

提前感谢。

Answer 1

经过一些研究，我发现，onTaskRemoved(...)只在startService(...)被调用时才被调用，而不是当有人只绑定它时才被调用。

所以我确实通过在onBind(...)中启动服务并在onUnbind(...)方法中停止它及其进程来解决问题。

这是最终代码:

public class SyncAdapterService extends Service {
private static final Object sSyncAdapterLock = new Object();
private static MySyncAdapter sSyncAdapter = null;
@Override
public void onCreate() {
    super.onCreate();
    synchronized (sSyncAdapterLock) {
        if (sSyncAdapter == null) {
            sSyncAdapter = new MySyncAdapter(getApplicationContext());
        }
    }
}
@Override
public void onTaskRemoved(Intent rootIntent) {
    super.onTaskRemoved(rootIntent);
    /*
     * Rescheduling sync due to running one is killed on removing from recent applications.
     */
    SyncHelper.requestSyncNow(this);
}
@Override
public IBinder onBind(Intent intent) {
    /*
     * Start service to watch {@link @onTaskRemoved(Intent)}
     */
    startService(new Intent(this, SyncAdapterService.class));
    return sSyncAdapter.getSyncAdapterBinder();
}
@Override
public boolean onUnbind(Intent intent) {
    /*
     * No more need watch task removes.
     */
    stopSelf();
    /*
     * Stops current process, it's not necessarily required. Assumes sync process is different
     * application one. (<service android:process=":sync" /> for example).
     */
    Process.killProcess(Process.myPid());
    return super.onUnbind(intent);
}
}