BlankDrawable.java

package com.forfan.bigbang.view;

import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.PixelFormat;
import android.graphics.drawable.Drawable;

/**
 * A drawable that draw nothing.
 * @author Rey
 *
 */
public class BlankDrawable extends Drawable {

	private static BlankDrawable mInstance;
	
	public static BlankDrawable getInstance(){
		if(mInstance == null)
			synchronized (BlankDrawable.class) {
				if(mInstance == null)
					mInstance = new BlankDrawable();
			}
		
		return mInstance;
	}
	
	@Override
	public void draw(Canvas canvas) {}

	@Override
	public void setAlpha(int alpha) {}

	@Override
	public void setColorFilter(ColorFilter cf) {}

	@Override
	public int getOpacity() {
		return PixelFormat.TRANSPARENT;
	}

}