Android UI 컨트롤 시리즈: ImageButton(아이콘이 있는 버튼)

package org.loulijun.imagebutton;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.TextView;

public class ImageButtonTest extends Activity {
    /** Called when the activity is first created. */
        TextView textview;
        ImageButton imgbtn1;
        ImageButton imgbtn2;
        ImageButton imgbtn3;
        ImageButton imgbtn4;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        textview=(TextView)findViewById(R.id.textview);
        //分别取得4个ImageButton对象
        imgbtn1=(ImageButton)findViewById(R.id.imagebutton1);
        imgbtn2=(ImageButton)findViewById(R.id.imagebutton2);
        imgbtn3=(ImageButton)findViewById(R.id.imagebutton3);
        imgbtn4=(ImageButton)findViewById(R.id.imagebutton4);

        //分别为ImageButton设置图标
        //imgbtn1已经在main.xml布局中设置了图标，所以就不在这里设置了（设置图标即可在程序中设置，也可在布局文件中设置）
        imgbtn2.setImageDrawable(getResources().getDrawable(R.drawable.icon));//在程序中设置图标
        imgbtn3.setImageDrawable(getResources().getDrawable(R.drawable.icon2));
        imgbtn4.setImageDrawable(getResources().getDrawable(android.R.drawable.sym_call_incoming));//设置系统图标

        //下面为各个按钮设置事件监听
        imgbtn1.setOnClickListener(new Button.OnClickListener()
        {
                        @Override
                        public void onClick(View v) {
                                // TODO Auto-generated method stub
                                Dialog dialog=new AlertDialog.Builder(ImageButtonTest.this)
                                .setTitle("提示")
                                .setMessage("我是ImageButton1")
                                .setPositiveButton("确定",new DialogInterface.OnClickListener() {

                                        @Override
                                        public void onClick(DialogInterface dialog, int which) {
                                                // TODO Auto-generated method stub
                                                //相应的处理操作
                                        }
                                }).create();
                                dialog.show();
                        }

        });

        imgbtn2.setOnClickListener(new Button.OnClickListener()
        {
                        @Override
                        public void onClick(View v) {
                                // TODO Auto-generated method stub
                                Dialog dialog=new AlertDialog.Builder(ImageButtonTest.this)
                                .setTitle("提示")
                                .setMessage("我是ImageButton2，我要使用ImageButton3的图标")
                                .setPositiveButton("确定",new DialogInterface.OnClickListener() {

                                        @Override
                                        public void onClick(DialogInterface dialog, int which) {
                                                // TODO Auto-generated method stub
                                                imgbtn2.setImageDrawable(getResources().getDrawable(R.drawable.icon2));
                                        }
                                }).create();
                                dialog.show();
                        }

        });

        imgbtn3.setOnClickListener(new Button.OnClickListener()
        {
                        @Override
                        public void onClick(View v) {
                                // TODO Auto-generated method stub
                                Dialog dialog=new AlertDialog.Builder(ImageButtonTest.this)
                                .setTitle("提示")
                                .setMessage("我是ImageButton3，我想使用系统打电话的图标")
                                .setPositiveButton("确定",new DialogInterface.OnClickListener() {

                                        @Override
                                        public void onClick(DialogInterface dialog, int which) {
                                                // TODO Auto-generated method stub
                                                imgbtn3.setImageDrawable(getResources().getDrawable(android.R.drawable.sym_action_call));
                                        }
                                }).create();
                                dialog.show();
                        }

        });

        imgbtn4.setOnClickListener(new Button.OnClickListener()
        {
                        @Override
                        public void onClick(View v) {
                                // TODO Auto-generated method stub
                                Dialog dialog=new AlertDialog.Builder(ImageButtonTest.this)
                                .setTitle("提示")
                                .setMessage("我是使用的系统图标")
                                .setPositiveButton("确定",new DialogInterface.OnClickListener() {

                                        @Override
                                        public void onClick(DialogInterface dialog, int which) {
                                                // TODO Auto-generated method stub
                                                //相应的处理操作
                                        }
                                }).create();
                                dialog.show();
                        }

        });
    }
}

<?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:id="@+id/textview"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="ImageButton测试案例"
    />
<ImageButton
        android:id="@+id/imagebutton1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/icon1"
/>
<ImageButton
        android:id="@+id/imagebutton2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
/>
<ImageButton
        android:id="@+id/imagebutton3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
/>
<ImageButton
        android:id="@+id/imagebutton4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
/>
</LinearLayout>