触发后删除地理围栏

Question

我在我的应用程序中使用地理围栏，除了删除触发的地理围栏外，一切正常。 我从 Android 的官方文档中删除了指南，但他们没有解释如何删除 IntentService 中的地理围栏。

这里是服务的事件处理程序代码：

@Override
protected void onHandleIntent(Intent intent) 
{
    Log.e("GeofenceIntentService", "Location handled");

    if (LocationClient.hasError(intent)) 
    {
        int errorCode = LocationClient.getErrorCode(intent);
        Log.e("GeofenceIntentService", "Location Services error: " + Integer.toString(errorCode));
    } 
    else 
    {
        int transitionType = LocationClient.getGeofenceTransition(intent);
        if (transitionType == Geofence.GEOFENCE_TRANSITION_ENTER)
        {
            List <Geofence> triggerList = LocationClient.getTriggeringGeofences(intent);
            String[] triggerIds = new String[triggerList.size()];

            for (int i = 0; i < triggerIds.length; i++) 
            {
                // Store the Id of each geofence
                triggerIds[i] = triggerList.get(i).getRequestId();

                Picture p = PicturesManager.getById(triggerIds[i], getApplicationContext());
                   /* ... do a lot of work here ... */


            }

        } 
        else 
            Log.e("ReceiveTransitionsIntentService", "Geofence transition error: " + Integer.toString(transitionType));
    }
}

他被触发后如何删除地理围栏？

Answer 1

你可以这样做：

LocationServices.GeofencingApi.removeGeofences(
           mGoogleApiClient,
           // This is the same pending intent that was used in addGeofences().
           getGeofencePendingIntent()
).setResultCallback(this); // Result processed in onResult().

您的 getGeofencePendingIntent() 方法可能如下所示：

/**
 * Gets a PendingIntent to send with the request to add or remove Geofences. Location Services
 * issues the Intent inside this PendingIntent whenever a geofence transition occurs for the
 * current list of geofences.
 *
 * @return A PendingIntent for the IntentService that handles geofence transitions.
 */
private PendingIntent getGeofencePendingIntent() {
    Log.d(TAG, "getGeofencePendingIntent()");
    // Reuse the PendingIntent if we already have it.
    if (mGeofencePendingIntent != null) {
        return mGeofencePendingIntent;
    }
    Intent intent = new Intent(mContext, GeofenceIntentServiceStub.class);
    // We use FLAG_UPDATE_CURRENT so that we get the same pending intent back when calling
    // addGeofences() and removeGeofences().
    mGeofencePendingIntent = PendingIntent.getService(mContext, 0, intent,
            PendingIntent.FLAG_UPDATE_CURRENT);
    return mGeofencePendingIntent;
}

Answer 2

您将像添加地理围栏时一样继续操作（创建一个LocationClient 并等待它连接）。连接后，在onConnected 回调方法中，您将在LocationClient 实例上调用removeGeofences，并将您要删除的请求ID 列表和OnRemoveGeofencesResultListener 实例作为回调处理程序传递给它。

当然，您必须使用在创建GeoFence 和GeoFence.Builder 的setRequestId 时使用的相同请求ID。

@Override
public void onConnected(Bundle arg0) {
    locationClient.removeGeofences(requestIDsList, 
    new OnRemoveGeofencesResultListener() {
    ...     
});