错误：StrictMode $ AndroidBlockGuardPolicy.onNetwork

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);

 

    }

}