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

btn.setOnTouchListener(new View.OnTouchListener(){

public boolean onTouch(View v, MotionEvent event) {

if(event.getAction() == MotionEvent.ACTION_DOWN){

//重新设置按下时的背景图片

((ImageButton)v).setImageDrawable(getResources().getDrawable(R.drawable.android_btn_pressed));

}else if(event.getAction() == MotionEvent.ACTION_UP){

//再修改为抬起时的正常图片

((ImageButton)v).setImageDrawable(getResources().getDrawable(R.drawable.android_btn));

}

return false;

}

});

<?xml version="1.0" encoding="utf-8"?>

<selectorxmlns:android="http://schemas.android.com/apk/res/android">

<item android:state_pressed="false"android:drawable="@drawable/android_btn" />

<item android:state_focused="true"android:drawable="@drawable/android_btn" />

<item android:state_pressed="true"android:drawable="@drawable/android_btn_pressed" />

</selector>

<ImageButton

android:id="@+id/imageButton2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:background="@layout/image_btn_press" />