android - 如何修复“java.lang.NumberFormatException:无效的double:”？

我正在尝试从EditText获取文本，并将其作为该函数的两倍传递
  
  这是我的代码：

 private MapViewLite mapView;
EditText lat,longs;
Button search;
String getLang,getlong;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    lat = findViewById(R.id.lat);
    longs = findViewById(R.id.longs);
    search = findViewById(R.id.search);
    // Get a MapViewLite instance from the layout.
    mapView = findViewById(R.id.map_view);
    mapView.onCreate(savedInstanceState);
    getLang = lat.getText().toString();
    getlong = longs.getText().toString();
    search.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            loadMapScene(getLang,getlong);
        }
    });
}
private void loadMapScene(String a,String b) {
    // Load a scene from the SDK to render the map with a map style.
    mapView.getMapScene().loadScene(MapStyle.NORMAL_DAY, new LoadSceneCallback() {
        @Override
        public void onLoadScene(@Nullable SceneError sceneError) {
            if (sceneError == null) {
                try {
                    double aa = new Double(getLang);
                    double bb = new Double(getlong);

                    mapView.getCamera().setTarget(new GeoCoordinates(aa, bb));
                    mapView.getCamera().setZoomLevel(14);
                }catch (Exception e){
                    Log.e("Catch :", e.getMessage());
                     e.printStackTrace();
                }
            } else {
                Log.e("ERROR ->>> ", "onLoadScene failed: " + sceneError.toString());
            }
        }
    });

  我单击按钮后，我得到的错误为：

W/System.err: java.lang.NumberFormatException: Invalid double: ""

  如何修复此错误，请回复

最佳答案

你在打电话

getLang = lat.getText().toString();
getlong = longs.getText().toString();

来自onCreate()

这些值未设置为yes，因此其文本为“”；

将它们移到loadMapScene()方法中