Android開發教程：RadioButton和CheckBox淺析

    RadioButton(單選按鈕)在Android開發中應用的非常廣泛，比如一些選擇項的時候，會用到單選按鈕。它是一種單個圓形單選框雙狀態的按鈕，可以選擇或不選擇。在RadioButton沒有被選中時，用戶能夠按下或點擊來選中它。但是，與復選框相反，用戶一旦選中就不能夠取消選中。

    實現RadioButton由兩部分組成,也就是RadioButton和RadioGroup配合使用.RadioGroup是單選組合框，可以容納多個RadioButton的容器.在沒有RadioGroup的情況下，RadioButton可以全部都選中；當多個RadioButton被RadioGroup包含的情況下，RadioButton只可以選擇一個。並用setOnCheckedChangeListener來對單選按鈕進行監聽

下面的具體的例子：

MainActivity.java

package com.android.radiobutton;  
 
import android.app.Activity;  
import android.os.Bundle;  
import android.widget.RadioGroup;  
import android.widget.Toast;  
 
public class MainActivity extends Activity {  
      
    //聲明RadioGroup  
    RadioGroup raGroup1,raGroup2;  
    @Override 
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
          
        //通過findViewById獲得RadioGroup對象  
        raGroup1=(RadioGroup)findViewById(R.id.radioGroup1);       
        //添加事件監聽器  
        raGroup1.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {  
              
            @Override 
            public void onCheckedChanged(RadioGroup group, int checkedId) {  
                // TODO Auto-generated method stub  
                if(checkedId==R.id.radioBtn1){                    
                    Toast.makeText(MainActivity.this, "你來自廣東省", Toast.LENGTH_LONG).show();  
                }  
                else if(checkedId==R.id.radioBtn2){  
                    Toast.makeText(MainActivity.this, "你來自廣西省", Toast.LENGTH_LONG).show();  
                }  
                else{  
                    Toast.makeText(MainActivity.this, "你來自湖南省", Toast.LENGTH_LONG).show();  
                }  
            }  
        });  
        raGroup2=(RadioGroup)findViewById(R.id.radioGroup2);       
        raGroup2.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {  
              
            @Override 
            public void onCheckedChanged(RadioGroup group, int checkedId) {  
                // TODO Auto-generated method stub  
                if(checkedId==R.id.radioBtn4){                    
                    Toast.makeText(MainActivity.this, "你的性別是男", Toast.LENGTH_LONG).show();  
                }  
                else {  
                    Toast.makeText(MainActivity.this, "你的性別是女", Toast.LENGTH_LONG).show();  
                }  
            }  
        });         
    }  
} 

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" 
    > 
    <TextView    
        android:layout_width="fill_parent"   
        android:layout_height="wrap_content"   
        android:text="@string/hello1" 
        /> 
        <RadioGroup 
            android:id="@+id/radioGroup1" 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:orientation="vertical" 
            > 
            <RadioButton 
                android:id="@+id/radioBtn1" 
                android:layout_width="wrap_content" 
                android:layout_height="wrap_content" 
                android:text="@string/radioBtn1" 
               /> 
            <RadioButton 
                android:id="@+id/radioBtn2" 
                android:layout_width="wrap_content" 
                android:layout_height="wrap_content" 
                android:text="@string/radioBtn2" 
               /> 
            <RadioButton 
                android:id="@+id/radioBtn3" 
                android:layout_width="wrap_content" 
                android:layout_height="wrap_content" 
                android:text="@string/radioBtn3" 
               /> 
        </RadioGroup> 
    <!-- 在兩個RadioGroup之間畫條橫線 --> 
    <View   
        android:layout_width="match_parent"   
        android:layout_height="1dp" 
        android:background="#ffffff" 
        /> 
    <TextView    
        android:layout_width="fill_parent"   
        android:layout_height="wrap_content"   
        android:text="@string/hello2" 
        /> 
        <RadioGroup 
            android:id="@+id/radioGroup2" 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:orientation="vertical"    
            > 
            <RadioButton 
                android:id="@+id/radioBtn4" 
                android:layout_width="wrap_content" 
                android:layout_height="wrap_content" 
                android:text="@string/radioBtn4" 
                android:textColor="#ffffff" 
               /> 
            <RadioButton 
                android:id="@+id/radioBtn5" 
                android:layout_width="wrap_content" 
                android:layout_height="wrap_content" 
                android:text="@string/radioBtn5" 
               /> 
        </RadioGroup> 
</LinearLayout> 

strings.xml

<?xml version="1.0" encoding="utf-8"?> 
<resources> 
    <string name="hello1">你來自哪個省</string> 
    <string name="hello2">你的性別是</string> 
    <string name="app_name">單選按鈕測試</string> 
    <string name="radioBtn1">廣東</string> 
    <string name="radioBtn2">廣西</string> 
    <string name="radioBtn3">湖南</string> 
    <string name="radioBtn4">男</string> 
    <string name="radioBtn5">女</string> 
</resources> 

效果圖：

650) this.width=650;" height=120>

RadioButton的另一種效果：

650) this.width=650;" height=120>