Question

我有一个服务，需要在用户移动时获取用户的位置。我还没有弄清楚如何在onStart中放置onLocationChanged，所以我把它放在外面。当用户移动时它仍会被调用吗？如果没有，我将如何在onStart中调用它？

public class myService extends Service implements LocationListener {
Double lat;
Double lng;

@Override
public IBinder onBind(Intent arg0) {
return null;
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
// Let it continue running until it is stopped.
Toast.makeText(this, "Service Started", Toast.LENGTH_LONG).show();





return START_STICKY;

}

@Override
public void onDestroy() {
super.onDestroy();
Toast.makeText(this, "Service Destroyed", Toast.LENGTH_LONG).show();

}



@Override
public void onLocationChanged(Location location) {

if (MainActivity.location != null) {


   lat = MainActivity.location.getLatitude();

    lng = MainActivity.location.getLongitude();


    if (MainActivity.placeArrayList.size() != 0) {
        for (int i = 0; i < MainActivity.placeArrayList.size(); i++) {


            Log.e("hello", String.valueOf(Float.parseFloat(MainActivity.latitudeArrayList.get(i))));

            MainActivity.destination.setLatitude(Double.parseDouble(MainActivity.latitudeArrayList.get(i)));
            MainActivity.destination.setLongitude(Double.parseDouble(MainActivity.longitudeArrayList.get(i)));
            Log.e("distancemeters", String.valueOf(MainActivity.location.distanceTo(MainActivity.destination)));

            if (MainActivity.location.distanceTo(MainActivity.destination)<100) {




                AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

                audioManager.setStreamVolume(AudioManager.STREAM_RING, AudioManager.RINGER_MODE_SILENT, AudioManager.FLAG_SHOW_UI);


            } else {



            }

        }


    }
}

}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {

}

@Override
public void onProviderEnabled(String provider) {

}

@Override
public void onProviderDisabled(String provider) {

}
}

Answer 1

假设您使用的是Google FusedLocationProviderApi，您需要先做几件事：

更改您的课程以实施GoogleApiClient.ConnectionCallbacks和GoogleApiClient.OnConnectionFailedListener
创建您的GoogleApi对象
创建您的LocationRequest对象
将您的课程注册为LocationListener

首先，按如下方式更改类定义：

public class myService extends Service implements LocationListener,      
                                                  GoogleApiClient.ConnectionCallbacks, 
                                                  GoogleApiClient.OnConnectionFailedListener {

然后将其放入onStart()方法：

// 2. Create the GoogleApi object
GoogleApi = new GoogleApiClient.Builder(this)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .addApi(LocationServices.API)
            .build();

// 3. Create the LocationRequest
mLocationRequest.setInterval(1000); // in milliseconds
mLocationRequest.setFastestInterval(1000); // in milliseconds
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);

// 4. Register your listener
LocationServices.FusedLocationApi.requestLocationUpdates(GoogleApi, mLocationRequest, this)

如果您要取消注册您的听众，请将其放在onDestroy()：

LocationServices.FusedLocationApi.removeLocationUpdates(GoogleApi, this);

但是，请记住，使用此方法意味着您将在指定的时间间隔内获得位置更新，当用户移动时，不。您需要找到一种方法来跟踪用户的位置并确定构成＆＃34;运动的最小距离＆＃34;。此外，您还需要考虑该位置可能会围绕用户的位置跳舞，因此您还必须考虑到这一点。

onLocationChanged是否会被调用，即使它不在Service的onStart中？

1 个答案: