Android基础教程(七)之----单选项框RadioGroup的综合应用

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:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<!--第一個TextView -->
<TextView
android:id="@+id/myTextView"
android:layout_width="228px"
android:layout_height="49px"
android:text="@string/str_radio_question1"
android:textSize="30sp"
/>
<!--建立一個RadioGroup -->
<RadioGroup
android:id="@+id/myRadioGroup"
android:layout_width="137px"
android:layout_height="216px"
android:orientation="vertical"
>
<!--第一個RadioButton -->
<RadioButton
android:id="@+id/myRadioButton1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/tr_radio_op1"
/>
<!--第二個RadioButton -->
<RadioButton
android:id="@+id/myRadioButton2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/tr_radio_op2"
/>
</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~