Android 开发教程

-----------------------------------Android 编 程 基 础
4 修 改 mainActivity.java 文 件
package zyf.Ex_Ctrl_6;
import android.app.Activity;
import android.os.Bundle;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
public class Ex_Ctrl_6 extends Activity {
/** Called when the activity is first created. */
private TextView answer_TextView;
private RadioButton boy_RadioButton,girl_RadioButton;
private RadioGroup radioGroup;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
/* findViewById() 从 XML 中 获 取 资 源 对 象 */
answer_TextView=(TextView)findViewById(R.id.TextView_Ask_And_Show);
radioGroup=(RadioGroup)findViewById(R.id.RadioGroup);
boy_RadioButton=(RadioButton)findViewById(R.id.RadioButton_Boy);
girl_RadioButton=(RadioButton)findViewById(R.id.RadioButton_Gril);
/* 给 单 RadioGroup 添 加 状 态 改 变 监 听 器 */
radioGroup.setOnCheckedChangeListener(new
new
RadioGroup.OnCheckedChangeListener(){
}
}
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
// TODO Auto-generated method stub
if(boy_RadioButton.isChecked()){
answer_TextView.setText(R.string.iam_Boy);
}else
else{
answer_TextView.setText(R.string.iamGirl);
}
}
});
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