Android ImageButtonセレクターの例

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/button__pressed__yellow"
          android:state__pressed="true"/>
    <item android:drawable="@drawable/button__focused__orange"
          android:state__focused="true"/>
    <item android:drawable="@drawable/button__normal__green"/>
</selector>

<?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" >

    <Button
        android:id="@+id/imageButtonSelector"
        android:layout__width="wrap__content"
        android:layout__height="wrap__content"
        android:background="@drawable/new__button"/>

</LinearLayout>

package com.mkyong.android;

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

public class MyAndroidAppActivity extends Activity {

    Button imageButton;

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

        addListenerOnButton();

    }

    public void addListenerOnButton() {

        imageButton = (Button) findViewById(R.id.imageButtonSelector);

        imageButton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {

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

            }

        });

    }

}