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

转自：http://blog.csdn.net/android_tutor/article/details/4804587

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~