Android ImageButtonの例

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout__width="fill__parent"
    android:layout__height="fill__parent"
    android:orientation="vertical" >

    <ImageButton
        android:id="@+id/imageButton1"
        android:layout__width="wrap__content"
        android:layout__height="wrap__content"
        android:src="@drawable/android__button"/>

</LinearLayout>

package com.mkyong.android;

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

public class MyAndroidAppActivity extends Activity {

    ImageButton imageButton;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        addListenerOnButton();

    }

    public void addListenerOnButton() {

        imageButton = (ImageButton) findViewById(R.id.imageButton1);

        imageButton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {

               Toast.makeText(MyAndroidAppActivity.this,
                "ImageButton is clicked!", Toast.LENGTH__SHORT).show();

            }

        });

    }

}