Activity Transition API无效

Question

我希望使用新的Activity转换API，并在按照教程here后，我无法获得所需的结果。

这是我设置我希望检测的活动转换的代码：

public void setActivityTransitions() {
    transitionList = new ArrayList<>();
    ArrayList<Integer> activities = new ArrayList<>(Arrays.asList(
            DetectedActivity.STILL,
            DetectedActivity.WALKING,
            DetectedActivity.ON_FOOT,
            DetectedActivity.RUNNING,
            DetectedActivity.ON_BICYCLE,
            DetectedActivity.IN_VEHICLE));
    for (int activity :
            activities) {
        transitionList.add(new ActivityTransition.Builder()
                .setActivityType(activity)
                .setActivityTransition(ActivityTransition.ACTIVITY_TRANSITION_ENTER).build());

        transitionList.add(new ActivityTransition.Builder()
                .setActivityType(activity)
                .setActivityTransition(ActivityTransition.ACTIVITY_TRANSITION_EXIT).build());

    }

}

然后请求活动转换更新：

 ActivityTransitionRequest activityTransitionRequest = new ActivityTransitionRequest(transitionList);
        Intent intent = new Intent(context, ActivityDetectorTransitionService.class);
        intent.setAction("com.test.activityrecognition.START_ACTIVITY_TRANSITION_DETECTION_ALARM");
        PendingIntent pendingIntent = PendingIntent.getService(context, 1, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        Task<Void> task = ActivityRecognition.getClient(context).requestActivityTransitionUpdates(activityTransitionRequest, pendingIntent);
        task.addOnSuccessListener(new OnSuccessListener<Void>() {
            @Override
            public void onSuccess(Void result) {
                System.out.println("onSuccess");
            }
        });
        task.addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {
                e.printStackTrace();
                System.out.println("onFailure");
            }
        });

这是广播接收者：

    public class ActivityDetectorTransitionService extends BroadcastReceiver {
    private static final String TAG = "ActivityDetectorTransitionService";

    @Override
    public void onReceive(Context context, Intent intent) {
        if (ActivityTransitionResult.hasResult(intent)) {
            ActivityTransitionResult activityTransitionResult = ActivityTransitionResult.extractResult(intent);
            ActivityDetectorTransitionAPI.getInstance().handleActivityRecognitionResult(activityTransitionResult);
        }
    }
}

（该名称有服务，因为最初我保持服务但仍然无法正常工作。）

在清单中：

<receiver
    android:name=".tracking.activityrecognition.ActivityDetectorTransitionService">
    <intent-filter>
        <action android:name="com.test.activityrecognition.START_ACTIVITY_TRANSITION_DETECTION_ALARM"/>
    </intent-filter>
</receiver>

Answer 1

你正在使用PendingIntent.getService()和BroadcastReceiver。

要使用BroadcastReceiver接收待定意图，您必须使用PendingIntent检索PendingIntent.getBroadcast()实例。有关意图和意图过滤器的相应开发人员指南可以找到here。

自Android 8以来，有几个background service limitations。使用IntentService仅在应用程序位于前台时才有效。要在应用关闭后接收活动转换更新，您甚至必须使用BroadcastReceiver。为此目的，BroadcastReceiver必须在相应的许可下在申请表中注册，如JanMaděra已经提到的那样。

   <receiver android:name="com.mypackage.ActivityTransitionBroadcastReceiver"
       android:exported="false"
       android:permission="com.google.android.gms.permission.ACTIVITY_RECOGNITION">
       <intent-filter>
           <action android:name="com.mypackage.ACTION_PROCESS_ACTIVITY_TRANSITIONS" />
       </intent-filter>
   </receiver>

此外，onReceive()应该只响应你的具体行动，因为intent filters are not guaranteed to be exclusive。

public class ActivityTransitionBroadcastReceiver extends BroadcastReceiver {

    public static final String INTENT_ACTION = "com.mypackage" +
                    ".ACTION_PROCESS_ACTIVITY_TRANSITIONS";

    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent != null && INTENT_ACTION.equals(intent.getAction())) {
            if (ActivityTransitionResult.hasResult(intent)) {
                ActivityTransitionResult intentResult = ActivityTransitionResult
                        .extractResult(intent);
                // handle activity transition result ...
            }
        }
    }
}

使用PendingIntent.getBroadcast()请求活动转换更新：

ActivityTransitionRequest request = new ActivityTransitionRequest(transitionList);

Intent intent = new Intent(context, ActivityTransitionBroadcastReceiver.class);
intent.setAction(ActivityTransitionBroadcastReceiver.INTENT_ACTION);

PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent,
        PendingIntent.FLAG_UPDATE_CURRENT);

Task<Void> task = ActivityRecognition.getClient(context)
        .requestActivityTransitionUpdates(request, pendingIntent);

请注意，可以延迟接收活动转换更新。这取决于设备，也可能受到电源管理限制的影响。

Answer 2

我面临类似的问题，但帮我添加接收器到清单

    <receiver
    android:name=".service.ActivityTransitionReceiver"
    android:permission="com.google.android.gms.permission.ACTIVITY_RECOGNITION"
    android:exported="false" />

Answer 3

这是一个老帖子，但这个答案可能对某人有帮助。

请记住，延迟可能实际上是问题，就像我的情况一样。我认为我的实施不起作用，但事实上它确实如此。 Activity Transitions API只有大约1分钟的延迟才能通知您转换。因此，请尝试四处走动或开车几分钟以开始接收通知。