如何在没有“实现LocationListener”的情况下使用LocationListener？

Question

我终于找到了一个可以获取用户GPS位置的应用程序，但我实现了LocationListener。它工作得很好，但我需要在不实现它的情况下完成它，因为我必须做一个不实现方法的类。

我搜索了很多教程，查看了很多网站，我试图将我的代码转换为不实现LocationListener，但我做不到，我测试的每一件事都会破坏我的应用程序，并停止获取用户的GPS位置。

请，如果有人在这方面的专家可以转换我的代码，而不是使用“实现LocationListener”，我会很高兴他

下面是要转换的代码：

public class GpsMiniActivity extends Activity implements LocationListener{

private LocationManager mLocMgr;
private TextView tv1;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    FrameLayout rl = new FrameLayout(this.getApplicationContext());
    LinearLayout ll= new LinearLayout(this.getApplicationContext());
    ll.setOrientation(LinearLayout.VERTICAL);

    setContentView(rl);
    rl.addView(ll);

    tv1=new TextView(getApplicationContext());
    ll.addView(tv1);

    //setContentView(R.layout.main);
    mLocMgr = (LocationManager) getSystemService(LOCATION_SERVICE);
    mLocMgr.requestLocationUpdates(LocationManager.GPS_PROVIDER,
            500, 0, this);
}
@Override
public void onLocationChanged(Location location) {
    tv1.setText("Lat " +   location.getLatitude() + " Long " + location.getLongitude());
}
public void onProviderDisabled(String provider) {}
public void onProviderEnabled(String provider) {}
public void onStatusChanged(String provider, int status, Bundle extras) {}
}

Answer 1

public class GpsMiniActivity extends Activity {

private LocationManager mLocMgr;
private TextView tv1;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    FrameLayout rl = new FrameLayout(this.getApplicationContext());
    LinearLayout ll= new LinearLayout(this.getApplicationContext());
    ll.setOrientation(LinearLayout.VERTICAL);

    setContentView(rl);
    rl.addView(ll);

    tv1=new TextView(getApplicationContext());
    ll.addView(tv1);

    //setContentView(R.layout.main);
    mLocMgr = (LocationManager) getSystemService(LOCATION_SERVICE);
    mLocMgr.requestLocationUpdates(LocationManager.GPS_PROVIDER,
            500, 0, ll);
}
}
private LocationListener ll = new LocationListener(){
public void onLocationChanged(Location location) {
    tv1.setText("Lat " +   location.getLatitude() + " Long " + location.getLongitude());
}
public void onProviderDisabled(String provider) {}
public void onProviderEnabled(String provider) {}
public void onStatusChanged(String provider, int status, Bundle extras) {}
}
}

这就对了。

Answer 2

为此，您必须在onCreate()之外创建一个单独的LocationListener，并将其引用给LocationManager的requestLocationUpdates，如下所示

 LocationListener mLocationListener = new LocationListener() {

            @Override
            public void onStatusChanged(String provider, int status, Bundle extras) {}
            @Override
            public void onProviderEnabled(String provider) {}
            @Override
            public void onProviderDisabled(String provider) {}
            @Override
            public void onLocationChanged(Location location) {
                tv1.setText("Lat " +   location.getLatitude() + " Long " + location.getLongitude());
            }
        };

在此之后，您必须在onCreate()中像这样引用此LocationListener

mLocMgr = (LocationManager) getSystemService(LOCATION_SERVICE);
        mLocMgr.requestLocationUpdates(LocationManager.GPS_PROVIDER,
                500, 0, mLocationListener);