安卓 : Remove LocationListener

Question

我有以下代码使用 GPS 获取用户位置。(代码工作正常)
但我的问题是，当我关闭程序(按后退按钮)时，它会生成错误消息
应用程序......已停止工作............请重试。 .
我认为我必须删除监听器，因为我在 onDestroy() 中使用了 removeUpdates() 方法，然后也会生成相同的错误消息。
我该如何解决。
我的代码:

public class Location_AddressActivity extends Activity {

    /** Called when the activity is first created. */
    TextView txt_logitude;
    TextView txt_latitude;
    TextView txt_address;
    LocationListener mlocListener;
    LocationManager mlocManager;
    Geocoder geocoder;

    public void onCreate(Bundle savedInstanceState) {       

        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        txt_logitude=(TextView)findViewById(R.id.txt_logitude);
        txt_latitude=(TextView)findViewById(R.id.txt_latitude);
        txt_address=(TextView)findViewById(R.id.txt_address);
        geocoder = new Geocoder(this, Locale.ENGLISH);
        txt_latitude.setText("");
        txt_logitude.setText("");
        txt_address.setText("");
        mlocManager= (LocationManager)getSystemService(Context.LOCATION_SERVICE);
        mlocListener = new MyLocationListener();
        mlocManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, mlocListener);
    }
    public  void onDestroy()
    {
        mlocManager.removeUpdates(mlocListener);
    }
    class MyLocationListener implements LocationListener
    {
        public void onLocationChanged(Location location) {
            double latitude=location.getLatitude();
            double longitude=location.getLongitude();
            txt_latitude.setText(new Double(latitude).toString());
            txt_logitude.setText(new Double(longitude).toString());
            try {
                List<Address> addresses = geocoder.getFromLocation(latitude, longitude, 1);              
                if(addresses != null) {
                    Address returnedAddress = addresses.get(0);
                    StringBuilder strReturnedAddress = new StringBuilder("Address:\n");
                    for(int i=0; i<returnedAddress.getMaxAddressLineIndex(); i++) {
                        strReturnedAddress.append(returnedAddress.getAddressLine(i)).append("\n");
                    }
                    txt_address.setText(strReturnedAddress.toString());
                }
                else{
                    txt_address.setText("No Address returned!");
                }
            } 
            catch (IOException e) {
                e.printStackTrace();
                txt_address.setText(e.getMessage());
            }
        }
        public void onProviderDisabled(String provider) {
            txt_address.setText("GPS Disable");
        }
        public void onProviderEnabled(String provider) {
            txt_address.setText("GPS Enable");      
        }           
    }   
}

谢谢..

Answer 1

您已在您的 Activity 的 onDestroy() 中删除了对 super.onDestroy 的调用。只需按如下所示更改该代码并试一试。

public  void onDestroy()
    {
        super.onDestroy();
        mlocManager.removeUpdates(mlocListener);
    }

我希望 removeUpdates() 不会给您带来任何问题。