大家好,我们今天这一节要介绍的是RadioGroup 的组事件.RadioGroup 可将各自不同的RadioButton ,设限于同一个Radio 按钮组,同一个RadioGroup 组里的按钮,只能做出单一选择(单选题).
首先,我们先设计一个TextView Widget ,以及一个RadioGroup ,并将该RadioGroup 内放置两个RadioButton ,默认为都不选择,在程序运行阶段,利用onCheckedChanged 作为启动事件装置,让User选择其中一个按钮,显示被选择的内容,最的将RadioButton 的选项文字显示于TextView 当中.
下面我们看一下效果图:
strings.xml:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, RadioGroupDemoActivity!</string>
<string name="app_name">RadioGroupDemo</string>
<string name="tr_radio_op1">帅哥</string>
<string name="tr_radio_op2">美女</string>
<string name="str_radio_question1">请问你是？</string>
</resources>
main.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:andro
/>
</RadioGroup>
</LinearLayout>
RadioGroupDemoActivity.java
package com.lp.ecjtu;
import android.app.Activity;
import android.os.Bundle;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.TextView;
public class RadioGroupDemoActivity extends Activity {
/** Called when the activity is first created. */
private TextView txt;
private RadioGroup radiogroup;
private RadioButton rbtn1,rbtn2;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
txt = (TextView) findViewById(R.id.myTextView);
radiogroup = (RadioGroup) findViewById(R.id.myRadioGroup);
rbtn1 = (RadioButton) findViewById(R.id.myRadioButton1);
rbtn2 = (RadioButton) findViewById(R.id.myRadioButton2);
radiogroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
// TODO Auto-generated method stub
//当选择的是第一个单选按钮的时候，把第一个单选按钮的内容传到TextView里面进行显示
if(checkedId == rbtn1.getId()){
txt.setText(rbtn1.getText());
}else if(checkedId == rbtn2.getId()){
txt.setText(rbtn2.getText());
}
}
});
}
}