java.lang.NumberFormatException : empty String Unable to start activity Component Info 异常

Question

我得到了错误 我的代码 fragment 在这里。

 switch (message.what) {
                case 1:

                Bundle bundle = message.getData();
                latitude = bundle.getString("latitude");
                longitude = bundle.getString("longitude")
               break;
            default:
                locationAddress = null;
        }
        Toast.makeText(getApplicationContext(), latitude + longitude, Toast.LENGTH_LONG).show();
        SharedPreferences.Editor editor = sh.edit();
        editor.putString(SharedPrefManager.RESTAURANT_LAT, String.valueOf(latitude));
        editor.putString(SharedPrefManager.RESTAURANT_LON, String.valueOf(longitude));
        Log.d("ResultRestroSave", String.valueOf(editor));

        Log.d("ResultRestrodata", latitude + longitude);


    }

我的另一个代码 fragment 在这里

我得到了错误

java.lang.RuntimeException:无法启动 Activity ComponentInfo java.lang.NumberFormatException:空字符串

 sh = DriverMapsActivity.this.getSharedPreferences(SharedPrefManager.SHARED_PREF_NAME,MODE_PRIVATE);
     // Error in this line


 res_latitude = Double.parseDouble(sh.getString(SharedPrefManager.RESTAURANT_LAT,""));
            res_longitude = Double.parseDouble(sh.getString(SharedPrefManager.RESTAURANT_LON,""));

Answer 1

您的方法缺少两件事:

- 在 editor.putString(SharedPrefManager.RESTAURANT_LON, String.valueOf(longitude));

之后缺少提交

    ...
    SharedPreferences.Editor editor = sh.edit();
    editor.putString(SharedPrefManager.RESTAURANT_LAT, String.valueOf(latitude));
    editor.putString(SharedPrefManager.RESTAURANT_LON, String.valueOf(longitude));
    Log.d("ResultRestroSave", String.valueOf(editor));

    Log.d("ResultRestrodata", latitude + longitude);
    editor.commit();

    ...

- 而不是 sh.getString(SharedPrefManager.RESTAURANT_LAT,""); 使用

          res_latitude = Double.parseDouble(sh.getString(SharedPrefManager.RESTAURANT_LAT,"0"));
          res_longitude = Double.parseDouble(sh.getString(SharedPrefManager.RESTAURANT_LON,"0"));