After geofence transition how do i do something on main Activity?

Question

When someone enters one of my geofences I want to make a layout visible over my map and start playing some audio. I have been following some tutorials and I know how to do push notifications when they enter, but this all happens in another IntentService class.

也许这是onResult的目的？我不确定如何从结果参数获取地理围栏信息

LocationServices.GeofencingApi.addGeofences(
            gApiClient,
            getGeofencingRequest(),
            getGeofencePendingIntent()
    ).setResultCallback(this);

 @Override
public void onResult(Result result) {


}

这是我的intentService类

public class GeofenceTransitionsIntentService extends IntentService {
private final String TAG = "Geofence_transitions";


public GeofenceTransitionsIntentService() {
    super("geo-service");
}


@Override
protected void onHandleIntent(Intent intent) {
    GeofencingEvent geofencingEvent = GeofencingEvent.fromIntent(intent);
    if (geofencingEvent.hasError()) {
        String errorMessage = geofencingEvent.getErrorCode()+"";
        Log.e(TAG, errorMessage);
        return;
    }

    // Get the transition type.
    int geofenceTransition = geofencingEvent.getGeofenceTransition();

    // Test that the reported transition was of interest.
    if (geofenceTransition == Geofence.GEOFENCE_TRANSITION_ENTER ||geofenceTransition == Geofence.GEOFENCE_TRANSITION_DWELL ||
            geofenceTransition == Geofence.GEOFENCE_TRANSITION_EXIT) {

        // Get the geofences that were triggered. A single event can trigger
        // multiple geofences.
        ArrayList<Geofence> triggeringGeofences = (ArrayList<Geofence>) geofencingEvent.getTriggeringGeofences();

        // Get the transition details as a String.
        String geofenceTransitionDetails = getGeofenceTransitionDetails(
                this,
                geofenceTransition,
                triggeringGeofences
        );

        NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this)
                        .setSmallIcon(R.drawable.ic_media_play)
                        .setContentTitle("Geofence!")
                        .setContentText(geofenceTransitionDetails);

        mBuilder.setStyle(new NotificationCompat.BigTextStyle(mBuilder).bigText(geofenceTransitionDetails).setBigContentTitle("Big title")
                .setSummaryText(geofenceTransitionDetails));


        // Send notification and log the transition details.
        int mNotificationId = 001;

        NotificationManager mNotifyMgr =
                (NotificationManager)    getSystemService(NOTIFICATION_SERVICE);

        mNotifyMgr.notify(mNotificationId, mBuilder.build());

    } else {
        // Log the error.
        Log.e(TAG, getString(R.string.geofence_transition_invalid_type,
                geofenceTransition));

    }

}

人们通常如何获取触发的地理围栏的信息并在主线程上执行某些操作？

Answer 1

使用LocalBroadcastManager将广播发送到必须侦听事件的任何上下文。这是您在“活动”中应执行的操作的示例：

public class MyActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceBundle);
        //Your code here

        LocalBroadcastManager lbc = LocalBroadcastManager.getInstance(this);
        GoogleReceiver receiver = new GoogleReceiver(this);
        lbc.registerReceiver(googleReceiver, new IntentFilter("googlegeofence"));
        //Anything with this intent will be sent to this receiver

    }

    static class GoogleReceiver extends BroadcastReceiver{

        MyActivity mActivity;

        public GoogleReceiver(Activity activity){
            mActivity = (MyActivity)activity;
        }

        @Override
        public void onReceive(Context context, Intent intent) {
            //Handle the intent here
        }
    }
}

这是您应该为intentservice放下的东西：

public class GeofenceTransitionsIntentService extends IntentService {

//Any stuff you need to do here    

@Override
protected void onHandleIntent(Intent intent) {
    GeofencingEvent geofencingEvent = GeofencingEvent.fromIntent(intent);

    //Collect all the stuff you want to send to activity here


    Intent lbcIntent = new Intent("googlegeofence"); //Send to any reciever listening for this

    lbcIntent.putExtra("Key", Value);  //Put whatever it is you want the activity to handle

    LocalBroadcastManager.getInstance(this).sendBroadcast(lbcIntent);  //Send the intent
}