Question

我想根据用户当前的位置向用户提供一些优惠。

这意味着ui应该等待（不要被阻止，而是等待动画） - 所以我想使用位置监听器和asyncTask。

但是侦听器签名返回void

public class MyLocationListener implements LocationListener {

    public void onLocationChanged(final Location loc) {

并且asynTask在这里没有帮助（因为它是我活动中的一个分类课程）

你会怎么建议这样做？

Answer 1

希望这有助于你

public class MyLocationListener extends LocationListener{

    public interface MyLocCallbacks{
        onLocFound(double lat, double lng);
    }

    private MyLocCallbacks mCallbacks;

    public MyLocationListener(MyLocCallbacks callback){
        this.mCallbacks = callback;

        //Make sure to start the LocationSerivce here
    }   

    public void onLocationChanged(final Location loc) {
        this.mCallbacks.onLocFound(log.getLatitude(), loc.getLongitude()) 
    }

}

<强> MainActivity

public class MainActivity implements MyLocCallbacks{

    private MyLocationListener mLocListener;

    onCreate(S...){
        mLocListener = new MyLocationListener(this);  //this for the interface
    }

    //This one is called by your Location Listener
    @Override
    onLocFound(double lat, double lng){
        startAnimation();
    }


    private void startAnimation(){
        //do here your startAnimation, 
        //before you could show a simple loading screen
    }
}

如果监听器与我的Activity不在同一个类中，如何使用asyncTask +位置监听器？

1 个答案: