Question

我使用以下代码请求位置更新。在单独的处理程序线程中请求位置更新，但它仍影响主线程。任何人都可以建议一个解决方案。

private LocationListener mLocationListener = new LocationListener() {

    public void onLocationChanged(Location location) {

            mLongitude = location.getLongitude();
            mLatitude = location.getLatitude();
            mBearing = location.getBearing();

        }
}


mLocationManager = (LocationManager)
                this.getSystemService(Context.LOCATION_SERVICE);

HandlerThread handlerThread = new HandlerThread("HandlerThread");
handlerThread.start();

Looper looper = handlerThread.getLooper();

mLocationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,
                                    UPDATE_LOCATION_INTERVAL,
                                    UPDATE_LOCATION_MINIMUM_DISTANCE,
                                    mLocationListener, looper);
mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
                                    UPDATE_LOCATION_INTERVAL,
                                    UPDATE_LOCATION_MINIMUM_DISTANCE,
                                    mLocationListener, looper);

Answer 1

最可能的问题似乎是当你拨打Looper looper = handlerThread.getLooper();时，活套还没有准备就绪。这最终导致looper null，这会导致位置更新发生在主线程上。以下是getLooper()函数的更多信息。试试这个：

public class LocationThread extends HandlerThread {

    private static final long UPDATE_LOCATION_INTERVAL = 0;  //Set this to whatever you had it at
    private static final float UPDATE_LOCATION_MINIMUM_DISTANCE = 0.0f;  //Same with this

    private LocationManager mLocationManager;
    private LocationListener mLocationListener;

    public LocationThread(String name){
        super(name);
    }

    //Pass in your location manager and listener to this.  This assumes they are not null!
    public void startLocationUpdates(LocationManager locationManager, LocationListener locationListener){
        mLocationManager = locationManager;
        mLocationListener = locationListener;
        start();
    }

    //Use this to stop the updates and kill the thread.
    public void stopLocationUpdates(){
        if(mLocationManager != null){
            mLocationManager.removeUpdates(mLocationListener);
            mLocationListener = null;
            mLocationManager = null;
        }

        quit();
    }

    @Override
    protected void onLooperPrepared() {
        mLocationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,
                                        UPDATE_LOCATION_INTERVAL,
                                        UPDATE_LOCATION_MINIMUM_DISTANCE,
                                        mLocationListener, getLooper());
        mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
                                        UPDATE_LOCATION_INTERVAL,
                                        UPDATE_LOCATION_MINIMUM_DISTANCE,
                                        mLocationListener, getLooper());
    }
}

对于此课程，请勿使用start()或quit()函数，因为它们已在内部使用。

使用位置更新会影响主线程

1 个答案: