種子論壇 | 高雄市資訊培育協會學員討論區

package com.example.student.myapplication;
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 {
private TextView tv2;
private RadioButton rb1, rb2, rb3;
private RadioGroup rg;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv2= (TextView) findViewById(R.id.textView2);
rb1= (RadioButton) findViewById(R.id.radioButton1);
rb2= (RadioButton) findViewById(R.id.radioButton2);
rb3= (RadioButton) findViewById(R.id.radioButton3);
rg= (RadioGroup) findViewById(R.id.radioGroup);
rg.setOnCheckedChangeListener(myListener);
}
private RadioGroup.OnCheckedChangeListener myListener=new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
RadioButton rb= (RadioButton) findViewById(checkedId);
tv2.setText(rb.getText());
// if(checkedId==R.id.radioButton1)
// tv2.setText(rb1.getText());
// if(checkedId==R.id.radioButton2)
// tv2.setText(rb2.getText());
// if(checkedId==R.id.radioButton3)
// tv2.setText(rb3.getText());
}
};
}

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