RadioButton

跟CheckBox一樣, RadioButton可以是及必需是兩種狀態中的其中一種狀態, checked或unchecked. 但checked了之後, 用戶無法把它uncheck.



創建一個Android Application, AndroidRadioButton. 並根據下面的例子修改佈局文件(/res/layout/main.xml)及主程序(AndroidRadioButton.java).

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/hello"
    />
<RadioButton
    android:id="@+id/radiobutton"
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="Radio Button"
    />
<Button
    android:id="@+id/clear"
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="Clear"
    />
</LinearLayout>

AndroidRadioButton.java

package com.AndroidRadioButton;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;

public class AndroidRadioButton extends Activity {
 
 RadioButton radioButton;
 Button clearButton;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        radioButton = (RadioButton)findViewById(R.id.radiobutton);
        clearButton = (Button)findViewById(R.id.clear);
        clearButton.setOnClickListener(clearButtonOnClickListener);
    }
    
    private Button.OnClickListener clearButtonOnClickListener
     = new Button.OnClickListener(){

   public void onClick(View v) {
    // TODO Auto-generated method stub
    radioButton.setChecked(false);
   }
     
    };
}

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