you have to insert 2 lines "StrictMode" on MainActivity Class, example's below:
在onCreate()方法下一行添加StrictMode
例子：
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//come here
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}
}