从最新消息中清除时，SyncAdapter进程被杀死

Question

我正在尝试创建运行后台操作（没有前台通知）的SyncAdapter。

它正在工作，但触发ContentResolver.requestSync(...)活动（任务）从最近的应用程序中消失的情况除外。 在这种情况下，进程将被onPerformSync(...) ， onPerformSync(...)尚未完成。

我知道，这是Android的预期行为，但是在常规Service我会设置

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

    return START_REDELIVER_INTENT;
}

或使用

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

    restartSynchronization();
}

重试同步，但是在SyncAdapterService中不起作用。

从最近的应用程序中清除活动后，如何确保同步继续/重试？

先感谢您。

Answer 1

经过一番研究，我发现，仅在startService(...)时才调用onTaskRemoved(...)而不是仅在有人绑定到它时才调用。

因此，我通过在onBind(...)启动服务并在onUnbind(...)方法中停止该服务及其进程来解决了onUnbind(...) 。

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);
}
}