相关疑难解决方法(0)

我有三个一段代码RadioButton中A S RadioGroup.我想设置的onCheckedListener,将显示的值RadioButton的Toast.然而,到目前为止,我所得到的并不奏效.如何获取RadioButton并显示它的值Toast？提前谢谢,这是我的代码:

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.Toast;

public class MainActivity extends Activity {

    RadioGroup rg;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        RadioGroup rg = (RadioGroup) findViewById(R.id.radioGroup1);
        final String value =
            ((RadioButton)findViewById(rg.getCheckedRadioButtonId()))
            .getText().toString();

        rg.setOnCheckedChangeListener(new OnCheckedChangeListener() {
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                Toast.makeText(getBaseContext(), value, Toast.LENGTH_SHORT).show();
            }
        });
    }
}

XML文件:

<RelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" …