无法在CountDownTimer中未调用Looper.prepare()的线程内创建处理程序

Question

我有服务.并且有一个名为onServiceUpdate()的方法.此方法类似于Google Maps API中的onLocationChanged().

所以我想在onServiceUpdate()方法中启动CountDownTimer,但显示如下错误:

Can't create handler inside thread that has not called Looper.prepare()
    java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
            at android.os.Handler.<init>(Handler.java:200)
            at android.os.Handler.<init>(Handler.java:114)
            at android.os.CountDownTimer$1.<init>(CountDownTimer.java:114)
            at android.os.CountDownTimer.<init>(CountDownTimer.java:114)
            at skripsi.ubm.studenttracking.Service2$6.<init>(Service2.java:317)
            at skripsi.ubm.studenttracking.Service2.onServiceUpdate(Service2.java:317)

这是我的代码:

    @Override
    public void onServiceUpdate(ServiceState state)
    {
final float[] distance = new float[2];
        Location.distanceBetween(state.getGeoPoint().getLatitude(), state.getGeoPoint().getLongitude(), 6.130607787619352,106.81839518499267, distance);
        if (distance[0] > 25.0)
        {

                        CountDownTimer cdt5  = new CountDownTimer(total_onServiceUpdate,1000) {
                            @Override
                            public void onTick(long millisUntilFinished) {
                                total_onServiceUpdate = millisUntilFinished/1000;
                            }

                            @Override
                            public void onFinish() {
                                sendSMS();
                                stopSelf();
                            }
                        }.start();

        }

Answer 1

onServiceUpdate()是一个运行并通知你的aysnchronous任务,因此它是一个后台线程.你需要做的就是调用timer.start(); 从主线程,服务实际上在主线程上运行,而不是如此的intentService,你的解决方案是沿着

new Handler(Looper.getMainLooper()).post(new Runnable() {           
        @Override
        public void run() {
            CountDownTimer cdt5  = new CountDownTimer(total_onServiceUpdate,1000) {
                        @Override
                        public void onTick(long millisUntilFinished) {
                            total_onServiceUpdate = millisUntilFinished/1000;
                        }

                        @Override
                        public void onFinish() {
                            sendSMS();
                            stopSelf();
                        }
                    }.start();
        }
    });

现在你可以继续了.始终通过主Looper上的屏幕调用代码调情

希望能帮助到你