CheckBox

CheckBox是一種特定類型的按鈕, 它可以是及必需是兩種狀態中的其中一種狀態, checked或unchecked. 被文字混淆了吧! 來一個例子便容易理解了.



創建一個Android Application, AndroidCheckBox. 並根據下面的例子修改佈局文件(/res/layout/main.xml)及主程序(AndroidCheckBox.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"
    />
<CheckBox
    android:id="@+id/checkbox" 
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" 
    android:text="Check Box"
 />
</LinearLayout>

AndroidCheckBox.java

package com.AndroidCheckBox;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.CheckBox;
import android.widget.Toast;

public class AndroidCheckBox extends Activity {
 
 CheckBox checkBox;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        checkBox = (CheckBox)findViewById(R.id.checkbox);
        
        checkBox.setOnClickListener(CheckBoxOnClickListener);
    }
    
    private CheckBox.OnClickListener CheckBoxOnClickListener =
     new CheckBox.OnClickListener(){

   @Override
   public void onClick(View v) {
    // TODO Auto-generated method stub
    Toast.makeText(AndroidCheckBox.this, 
      "Check Box State: "
      + checkBox.isChecked(),
      Toast.LENGTH_LONG).show();
   }
    };
}