Android地理围栏不会触发一次位置关闭和再次打开[重复]

Posted 2023-04-14

【中文标题】Android地理围栏不会触发一次位置关闭和再次打开[重复]

【英文标题】：Android Geofence not triggers once location OFF and ON again [duplicate]

【发布时间】：2015-07-24 12:10:04

【问题描述】：

我正在使用 android 地理围栏 API。添加地理围栏后，它在位置打开时工作正常。但是如果我关闭位置并再次打开，之后地理围栏在进入或退出时不会触发。我已经在我的 Moto G 上使用 Android 5.0 进行了测试。 2 装置。如果位置关闭，地理围栏是否会过期？

我在 Android 文档上看到过，

如果用户禁用了网络位置提供程序，则 地理围栏服务将停止更新，所有注册的地理围栏将 已删除，并由提供的待处理意图生成意图。在 在这种情况下，从此意图创建的 GeofencingEvent 表示 错误事件，其中 hasError() 返回 true 并且 getErrorCode() 返回 GEOFENCE_NOT_AVAILABLE。

Document link

【参考方案1】：

是的，一旦关闭位置，地理围栏将被删除。

您应该在清单中使用BroadcastReceiver 来收听位置提供商广播，例如：

<receiver android:name="your.Receiver">
    <intent-filter>
        <action android:name="android.location.PROVIDERS_CHANGED"/>
    </intent-filter>
</receiver>

然后再次注册您的地理围栏。

public class LocationProviderReceiver extends BroadcastReceiver 

    public LocationProviderReceiver() 
    

    @Override
    public void onReceive(Context context, Intent intent) 
        if (action.equals(LocationManager.PROVIDERS_CHANGED_ACTION)) 
            // if location services enabled
                // restart geofences
        
    

【讨论】：

这不再有效，因为LocationManager.PROVIDERS_CHANGED_ACTION will not work on API 26 and higher

【参考方案2】：

将此添加到清单中：

<receiver android:name="com.aol.android.geofence.GeofenceReceiver"
        android:exported="false">
        <intent-filter >
            <action android:name="com.aol.android.geofence.ACTION_RECEIVE_GEOFENCE"/>
        </intent-filter>
    </receiver>

然后在 GeofenceRequester 类中，您需要更改 createRequestPendingIntent 方法，以便它转到您的 BroadcastReceiver 而不是 ReceiveTransitionsIntentService

private PendingIntent createRequestPendingIntent() 

        // If the PendingIntent already exists
        if (null != mGeofencePendingIntent) 

            // Return the existing intent
            return mGeofencePendingIntent;

        // If no PendingIntent exists
         else 

            // Create an Intent pointing to the IntentService
            Intent intent = new Intent("com.aol.android.geofence.ACTION_RECEIVE_GEOFENCE");
//            Intent intent = new Intent(context, ReceiveTransitionsIntentService.class);
            /*
             * Return a PendingIntent to start the IntentService.
             * Always create a PendingIntent sent to Location Services
             * with FLAG_UPDATE_CURRENT, so that sending the PendingIntent
             * again updates the original. Otherwise, Location Services
             * can't match the PendingIntent to requests made with it.
             */
            return PendingIntent.getBroadcast(
                    context,
                    0,
                    intent,
                    PendingIntent.FLAG_UPDATE_CURRENT);
        
    

然后我添加了 GeofenceReceiver 类，看起来像这样：

public class GeofenceReceiver extends BroadcastReceiver 
    Context context;

    Intent broadcastIntent = new Intent();

    @Override
    public void onReceive(Context context, Intent intent) 
        this.context = context;

        broadcastIntent.addCategory(GeofenceUtils.CATEGORY_LOCATION_SERVICES);

        if (LocationClient.hasError(intent)) 
            handleError(intent);
         else 
            handleEnterExit(intent);
        
    

    private void handleError(Intent intent)
        // Get the error code
        int errorCode = LocationClient.getErrorCode(intent);

        // Get the error message
        String errorMessage = LocationServiceErrorMessages.getErrorString(
                context, errorCode);

        // Log the error
        Log.e(GeofenceUtils.APPTAG,
                context.getString(R.string.geofence_transition_error_detail,
                        errorMessage));

        // Set the action and error message for the broadcast intent
        broadcastIntent
                .setAction(GeofenceUtils.ACTION_GEOFENCE_ERROR)
                .putExtra(GeofenceUtils.EXTRA_GEOFENCE_STATUS, errorMessage);

        // Broadcast the error *locally* to other components in this app
        LocalBroadcastManager.getInstance(context).sendBroadcast(
                broadcastIntent);
    


    private void handleEnterExit(Intent intent) 
        // Get the type of transition (entry or exit)
        int transition = LocationClient.getGeofenceTransition(intent);

        // Test that a valid transition was reported
        if ((transition == Geofence.GEOFENCE_TRANSITION_ENTER)
                || (transition == Geofence.GEOFENCE_TRANSITION_EXIT)) 

            // Post a notification
            List<Geofence> geofences = LocationClient
                    .getTriggeringGeofences(intent);
            String[] geofenceIds = new String[geofences.size()];
            String ids = TextUtils.join(GeofenceUtils.GEOFENCE_ID_DELIMITER,
                    geofenceIds);
            String transitionType = GeofenceUtils
                    .getTransitionString(transition);

            for (int index = 0; index < geofences.size(); index++) 
                Geofence geofence = geofences.get(index);
                ...do something with the geofence entry or exit. I'm saving them to a local sqlite db

            
            // Create an Intent to broadcast to the app
            broadcastIntent
                    .setAction(GeofenceUtils.ACTION_GEOFENCE_TRANSITION)
                    .addCategory(GeofenceUtils.CATEGORY_LOCATION_SERVICES)
                    .putExtra(GeofenceUtils.EXTRA_GEOFENCE_ID, geofenceIds)
                    .putExtra(GeofenceUtils.EXTRA_GEOFENCE_TRANSITION_TYPE,
                            transitionType);

            LocalBroadcastManager.getInstance(MyApplication.getContext())
                    .sendBroadcast(broadcastIntent);

            // Log the transition type and a message
            Log.d(GeofenceUtils.APPTAG, transitionType + ": " + ids);
            Log.d(GeofenceUtils.APPTAG,
                    context.getString(R.string.geofence_transition_notification_text));

            // In debug mode, log the result
            Log.d(GeofenceUtils.APPTAG, "transition");

            // An invalid transition was reported
         else 
            // Always log as an error
            Log.e(GeofenceUtils.APPTAG,
                    context.getString(R.string.geofence_transition_invalid_type,
                            transition));
        
    

    /**
     * Posts a notification in the notification bar when a transition is
     * detected. If the user clicks the notification, control goes to the main
     * Activity.
     * 
     * @param transitionType
     *            The type of transition that occurred.
     * 
     */
    private void sendNotification(String transitionType, String locationName) 

        // Create an explicit content Intent that starts the main Activity
        Intent notificationIntent = new Intent(context, MainActivity.class);

        // Construct a task stack
        TaskStackBuilder stackBuilder = TaskStackBuilder.create(context);

        // Adds the main Activity to the task stack as the parent
        stackBuilder.addParentStack(MainActivity.class);

        // Push the content Intent onto the stack
        stackBuilder.addNextIntent(notificationIntent);

        // Get a PendingIntent containing the entire back stack
        PendingIntent notificationPendingIntent = stackBuilder
                .getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);

        // Get a notification builder that's compatible with platform versions
        // >= 4
        NotificationCompat.Builder builder = new NotificationCompat.Builder(
                context);

        // Set the notification contents
        builder.setSmallIcon(R.drawable.ic_notification)
                .setContentTitle(transitionType + ": " + locationName)
                .setContentText(
                        context.getString(R.string.geofence_transition_notification_text))
                .setContentIntent(notificationPendingIntent);

        // Get an instance of the Notification manager
        NotificationManager mNotificationManager = (NotificationManager) context
                .getSystemService(Context.NOTIFICATION_SERVICE);

        // Issue the notification
        mNotificationManager.notify(0, builder.build());
    

【讨论】：

com.aol.android.geofence.ACTION_RECEIVE_GEOFENCE 不是隐含意图。