Android(安卓)实现图片倒影效果

package org.yang.android.util.graphics;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.LinearGradient;import android.graphics.Matrix;import android.graphics.Paint;import android.graphics.PorterDuffXfermode;import android.graphics.Bitmap.Config;import android.graphics.PorterDuff.Mode;import android.graphics.Shader.TileMode;public class ReflectionImage{public static int reflectionGap;public static int reflectImageHeight;public static Bitmap doReflection(Bitmap originalBitmap){if (originalBitmap == null){return null;}// 获取原图片的宽度和高度int width = originalBitmap.getWidth();int height = originalBitmap.getHeight();if (ReflectionImage.reflectImageHeight == 0){ReflectionImage.reflectImageHeight = height / 3;}// 图片缩放，x轴变为原来的1倍，y轴为-1倍,实现图片的反转Matrix matrix = new Matrix();matrix.preScale(1, -1);// 创建反转后的图片Bitmap对象,高度为 ReflectionImage.reflectImageHeightBitmap reflectionBitmap = Bitmap.createBitmap(originalBitmap, 0,ReflectionImage.reflectImageHeight, width,ReflectionImage.reflectImageHeight, matrix, false);// 创建标准的Bitmap对象，宽和原图一致,高度为（ 原图与倒影图的间距+倒影图的高度+原图的高度）Bitmap withReflectionBitmap = Bitmap.createBitmap(width,(height + ReflectionImage.reflectImageHeight + ReflectionImage.reflectionGap),Config.ARGB_8888);// 创建一个画面，以 withReflectionBitmap 为模板Canvas canvas = new Canvas(withReflectionBitmap);// 从上到下，先画原图canvas.drawBitmap(originalBitmap, 0, 0, null);// 因为 drawRect需要一个Paint画笔对象为参数，这里创建的是一个默认的Paint对象Paint defaultPaint = new Paint();// 再画间距canvas.drawRect(0, height, width, height+ ReflectionImage.reflectionGap, defaultPaint);// 最后画倒影图canvas.drawBitmap(reflectionBitmap, 0, height + reflectionGap, null);Paint paint = new Paint();// 这里用 LinearGradient 以实现倒影图的渐变效果LinearGradient shader = new LinearGradient(0,originalBitmap.getHeight(), 0,withReflectionBitmap.getHeight(), 0x70ffffff, 0x00ffffff,TileMode.MIRROR);paint.setShader(shader);paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));// 覆盖效果canvas.drawRect(0, height, width, withReflectionBitmap.getHeight(),paint);return withReflectionBitmap;}}
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