Java 第一个转换总是相同的-活动识别API-活动转换

我使用活动识别api和活动转换。当我第一次运行应用程序时，第一次转换始终是。在这个应用程序中，它是

WALKING-ENTER

。当我尝试仅在车辆进入中使用

和在车辆退出中使用
时，在车辆进入中使用
。我曾想过忽略第一次转换，但我测试过的设备没有出现这样的问题。有这些问题的设备是安卓8.1，没有问题的设备是6.0

MainActivity扩展了AppCompative活动

private static Intent serviceIntent;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    int PERMISSION_ALL = 1;
    String[] PERMISSIONS = {Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.ACCESS_FINE_LOCATION};

    if(!hasPermissions(this, PERMISSIONS)){
        ActivityCompat.requestPermissions(this, PERMISSIONS, PERMISSION_ALL);
    }


    Button button = findViewById(R.id.button);
    button.setOnClickListener(
            new View.OnClickListener() {
                public void onClick(View view) {
                    serviceIntent = new Intent(MainActivity.this, ServiceS.class);
                    MainActivity.this.startService(serviceIntent);
                }
            });

}

public static boolean hasPermissions(Context context, String... permissions) {
    if (permissions != null) {
        for (String permission : permissions) {
            if (ActivityCompat.checkSelfPermission(context, permission) != PackageManager.PERMISSION_GRANTED) {
                return false;
            }
        }
    }
    return true;
}

服务扩展服务

public ServiceS() {
    super();
}


public static void locationArrived(Context context, Location location) {
    Log.d("hmm: ", location.toString());
}

@SuppressLint("MissingPermission")
@Override
public int onStartCommand(Intent intent, int flags, int startId) {

    return super.onStartCommand(intent, flags, startId);
}

@Override
public void onCreate() {
    initActivityTransition();
    super.onCreate();
}

@Override
public void onDestroy() {
    Log.d("hmm: ", "Updates stopped!");
    Task task = ActivityRecognition.getClient(this)
            .removeActivityTransitionUpdates(activityPendingIntent);
    super.onDestroy();
}

// ACTIVITY TRANSITION BLOCK START

private static List<ActivityTransition> transitions = new ArrayList<>();
private static PendingIntent activityPendingIntent;
private static ActivityTransitionRequest transitionRequest;

void initActivityTransition(){
    transitions.add(
            new ActivityTransition.Builder()
                    .setActivityType(DetectedActivity.IN_VEHICLE)
                    .setActivityTransition(ActivityTransition.ACTIVITY_TRANSITION_EXIT)
                    .build());
    transitions.add(
            new ActivityTransition.Builder()
                    .setActivityType(DetectedActivity.IN_VEHICLE)
                    .setActivityTransition(ActivityTransition.ACTIVITY_TRANSITION_ENTER)
                    .build());
    transitions.add(
            new ActivityTransition.Builder()
                    .setActivityType(DetectedActivity.WALKING)
                    .setActivityTransition(ActivityTransition.ACTIVITY_TRANSITION_EXIT)
                    .build());
    transitions.add(
            new ActivityTransition.Builder()
                    .setActivityType(DetectedActivity.WALKING)
                    .setActivityTransition(ActivityTransition.ACTIVITY_TRANSITION_ENTER)
                    .build());
    transitions.add(
            new ActivityTransition.Builder()
                    .setActivityType(DetectedActivity.STILL)
                    .setActivityTransition(ActivityTransition.ACTIVITY_TRANSITION_ENTER)
                    .build());
    transitions.add(
            new ActivityTransition.Builder()
                    .setActivityType(DetectedActivity.STILL)
                    .setActivityTransition(ActivityTransition.ACTIVITY_TRANSITION_EXIT)
                    .build());


    Intent activityIntentService = new Intent(this, TransitionReceiver.class);
    activityPendingIntent = PendingIntent.getBroadcast(this, 1, activityIntentService, PendingIntent.FLAG_UPDATE_CURRENT);

    Log.d("hmm: ","DriveBuddyService - initActivityTransition");
}

static void transitionArrived(final ActivityTransitionEvent event, final Context context){
    Log.d("hmm: ", event.toString());

    Toast.makeText(context, event.getActivityType() + "-" + event.getTransitionType(), Toast.LENGTH_LONG).show();

}

@Override
public void onStart(Intent intent, int startId) {
    if(transitionRequest==null) {
        transitionRequest = new ActivityTransitionRequest(transitions);
    }
    Task task = ActivityRecognition.getClient(this)
            .requestActivityTransitionUpdates(transitionRequest, activityPendingIntent);
    super.onStart(intent, startId);
}

@Nullable
@Override
public IBinder onBind(Intent intent) {
    return null;
}

我也观察到了同样的事情。最后一个活动似乎保存在缓存或类似的东西中。我在安卓7.1和安卓8.1上看到了这种情况

为了解决这个问题，我检查了转换发生时经过的时间。如果转换发生在30秒前，我将忽略回调

这就是我的代码的样子：

@Override
public void onReceive(Context context, Intent i) {

    if (ActivityTransitionResult.hasResult(i)) {
        ActivityTransitionResult result = ActivityTransitionResult.extractResult(i);

        for (ActivityTransitionEvent event : result.getTransitionEvents()) {
            //continue only if the activity happened in the last 30 seconds
            //for some reason callbacks are received for old activities when the receiver is registered
            if(((SystemClock.elapsedRealtime()-(event.getElapsedRealTimeNanos()/1000000))/1000) <= 30) {
                //activity transition is legit. Do stuff here..
            }
        }
    }
}

@覆盖
公共void onReceive（上下文，意图i）{
if（ActivityTransitionResult.hasResult（i））{
ActivityTransitionResult=ActivityTransitionResult.extractResult（i）；
for（ActivityTransitionEvent事件：result.getTransitionEvents（））{
//仅当活动发生在最后30秒内时才继续
//由于某些原因，在注册接收者时会收到旧活动的回调
如果（（（SystemClock.elapsedRealtime（）-（event.getelapsedrealtimenos（）/1000000））/1000）我有android 9的OnePlus 6，根据我的测试，我有时会收到发生在5秒以上的事件（大约9-10秒之前），应该被视为可靠事件。@dor506 true，我也看到了。我在代码中将此更改为30秒。我也将在此处更新代码。我也遇到了同样的情况。现在我知道了原因。谢谢
@Override
public void onReceive(Context context, Intent i) {

    if (ActivityTransitionResult.hasResult(i)) {
        ActivityTransitionResult result = ActivityTransitionResult.extractResult(i);

        for (ActivityTransitionEvent event : result.getTransitionEvents()) {
            //continue only if the activity happened in the last 30 seconds
            //for some reason callbacks are received for old activities when the receiver is registered
            if(((SystemClock.elapsedRealtime()-(event.getElapsedRealTimeNanos()/1000000))/1000) <= 30) {
                //activity transition is legit. Do stuff here..
            }
        }
    }
}