android中图片重绘的工具类的实现_android paint 删除图片，然后重画

android实现重绘图片的工具类：

package com.demo.loading;
 
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
 
/**
 * 重绘图片
 * 
 * @author Administrator
 * 
 */
public class ImageRedraw {
	private static ImageRedraw instance;
 
	public static ImageRedraw getInstance() {
		if (instance == null) {
			instance = new ImageRedraw();
		}
		return instance;
	}
 
	public ImageRedraw() {
		super();
	}
 
	/**
	 * 重绘图片
	 * 
	 * @param bitmap
	 * @return newBitmap
	 */
	public Bitmap redrawImg(Bitmap bitmap, String type) {
		Bitmap newBitmap = bitmap;
		if (ConstantUtils.IMAGECARDBACK.equals(type)) {
			newBitmap = redrawCardBackImg(bitmap);
		} else if (ConstantUtils.IMAGECARDFRONT.equals(type)) {
			newBitmap = redrawCardInfo(bitmap);
		}
		return newBitmap;
	}
 
	/**
	 * 重绘头图片
	 * @param bitmap
	 * @return
	 */
	public Bitmap redrawCardBackImg(Bitmap bitmap) {
		int width = bitmap.getWidth();
		int height = bitmap.getHeight();
		// 946 233 原始大小
		// 315 78
		// 473 116
		// 445 110
		int newWidth = 445;
		int newHeight = 110;
		float scaleWidth = ((float) newWidth) / width;
		float scaleHe