ImageButton

	<ImageButton 
   	    android:id="@+id/imgBtn"
   	    android:layout_width="wrap_content"
   	    android:layout_height="wrap_content"
   	    android:background="@drawable/nopress"
   	    />
		
		
		
		final ImageButton imgBtn = (ImageButton) findViewById(R.id.imgBtn);
        imgBtn.setOnTouchListener(new OnTouchListener() {
			//OnTouchListener 触屏监听器
			public boolean onTouch(View arg0, MotionEvent event) {
				if(event.getAction() == MotionEvent.ACTION_DOWN){
					imgBtn.setBackgroundDrawable(getResources().getDrawable(R.drawable.press));
					//getResources().getDrawable(id) 传入图片ID得到一个Drawable对象
				}else if(event.getAction() == MotionEvent.ACTION_UP){
					imgBtn.setBackgroundDrawable(getResources().getDrawable(R.drawable.nopress));
				}
				return false;
			}
		});