RadioGroup与onCheckedChanged事件，实时显示所选

package dreamer.ex06;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    public TextView mTextView1;
    public RadioGroup mRadioGroup1;
    public RadioButton mRadio1,mRadio2;

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

        mTextView1 = (TextView) findViewById(R.id.tv_01);
        mRadioGroup1 = (RadioGroup) findViewById(R.id.rg_01);
        mRadio1 = (RadioButton) findViewById(R.id.rb_01);
        mRadio2 = (RadioButton) findViewById(R.id.rb_02);

        /*RadioGroup用OnCheckedChangeListener来运行*/
        mRadioGroup1.setOnCheckedChangeListener(mChangeRadio);
    }

    private RadioGroup.OnCheckedChangeListener mChangeRadio = new
            RadioGroup.OnCheckedChangeListener(){
                @Override
                public void onCheckedChanged(RadioGroup radioGroup, int i) {
                    if (i==mRadio1.getId()){
                        /*把mRadio1的内容传到mTextView1*/
                        mTextView1.setText(mRadio1.getText());
                    } else if (i==mRadio2.getId()){
                        /*把mRadio2的内容传到mTextView1*/
                        mTextView1.setText(mRadio2.getText());
                    }
                }
            };
}

xml.略