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:
下面是涉及的相关代码:
string.xml:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, RadioGroupDemo</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>
主布局main.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:andro
/>
</RadioGroup>
</LinearLayout>
最后是主控制程序RadioGroupDemo.java:
package com.android.test;
import android.app.Activity;
import android.os.Bundle;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
public class RadioGroupDemo extends Activity
{
public TextView mTextView1;
public RadioGroup mRadioGroup1;
public RadioButton mRadio1,mRadio2;
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
/*取得 TextView、RadioGroup、RadioButton对象*/
mTextView1 = (TextView) findViewById(R.id.myTextView);
mRadioGroup1 = (RadioGroup) findViewById(R.id.myRadioGroup);
mRadio1 = (RadioButton) findViewById(R.id.myRadioButton1);
mRadio2 = (RadioButton) findViewById(R.id.myRadioButton2);
/*RadioGroup用OnCheckedChangeListener来运行*/
mRadioGroup1.setOnCheckedChangeListener(mChangeRadio);
}
private RadioGroup.OnCheckedChangeListener mChangeRadio = new
RadioGroup.OnCheckedChangeListener()
{
@Override
public void onCheckedChanged(RadioGroup group, int checkedId)
{
// TODO Auto-generated method stub
if(checkedId==mRadio1.getId())
{
/*把mRadio1的内容传到mTextView1*/
mTextView1.setText(mRadio1.getText());
}
else if(checkedId==mRadio2.getId())
{
/*把mRadio2的内容传到mTextView1*/
mTextView1.setText(mRadio2.getText());
}
}
};
}
运行RadioGroupDemo.java ,将得到以上效果...今天就到这~