Question

我的应用程序在后台运行时具有以下流程：

OneTimeWorkRequest启动JobIntentService，依次进入onHandleWork()方法调用runService()（我的方法）。

private void runService(final Context ctx, final IndoorOutdoorManager.AggregatedDetectionListener detectionListener, long mode, long requestedTimeout, final int trigger) {
        this.acquireWakeLock();

        // Get the requested manager's timeout.
        long managerTimeout = (requestedTimeout < TIMEOUT_SERVICE_MAX) ? requestedTimeout : TIMEOUT_SERVICE_MAX;
        long tick = (managerTimeout == DETECTION_SHORT) ? TICK_SHORT : TICK_LOOP;

        // Guard the service with a countdown timer.
        if (countDownTimer != null) {
            countDownTimer.cancel();
        }
        countDownTimer = new CountDownTimer(managerTimeout, tick) {
            @Override
            public void onTick(long millisUntilFinished) { }

            @Override
            public void onFinish() {
                IndoorOutdoorLogger.d(IndoorOutdoorService.this, TAG, "Timeout reached");
                if (countDownTimer != null) {
                    countDownTimer.cancel();
                }
                IndoorOutdoorService.this.stopSelf();
                IndoorOutdoorLogger.d(IndoorOutdoorService.this, TAG, "Indoor Outdoor Service shut down.");
            }
        }.start();

        if (mode != 0) {
            isInLoopMode.set(mode == DETECTION_LOOP);
            Thread t = new Thread() {
                public void run() {
                    synchronized (lock) {
                        if (manager == null) {
                            manager = new IndoorOutdoorManager(ctx, detectionListener, isInLoopMode.get(), trigger);
                        }
                        if (client == null) {
                            client = new IndoorOutdoorClient(ctx, null);
                        }
                        manager.start();
                        client.startUserActivityRealTimeUpdates();
                    }
                }
            };
            t.start();
        }
    }

当我尝试运行应用程序时，出现此异常：

Can't create handler inside thread that has not called Looper.prepare()

异常指向的行是我创建countDownTimer实例的地方。

一些注意事项： 对于 Android N 及以下，流程为：广播接收器从onStartCommand()的{{1}}开始，依次运行我的Service方法，即使在背景中也没有问题。要调整应用程序使其在 Android O 及更高版本上运行，我必须使用runService()并将Service更改为JobIntentService以支持后台运行。它导致WorkManager出现异常，现在我被困住了。

使用CountDownTimer会导致RuntimeException

0 个答案: