分享自己写的一个高斯模糊的工具类，可以根据Bitmap,Imageviw,Drawable或者资源文件设置

public class BlurImageView { /** 水平方向模糊度 */ public static float HRADIUS = 5; /** 竖直方向模糊度 */ public static float VRADIUS = 5; /** 模糊迭代度 */ public static int ITERATIONS = 5; /** * 根据bitmap设置高斯模糊 * @param bmp:bitmap参数 * @return */ public static Drawable BoxBlurFilter(Bitmap bmp) { int width = bmp.getWidth(); int height = bmp.getHeight(); int[] inPixels = new int[width * height]; int[] outPixels = new int[width * height]; Bitmap bitmap = Bitmap.createBitmap(width, height,Bitmap.Config.ARGB_8888); bmp.getPixels(inPixels, 0, width, 0, 0, width, height); for (int i = 0; i < ITERATIONS; i++) { blur(inPixels, outPixels, width, height, HRADIUS); blur(outPixels, inPixels, height, width, VRADIUS); } blurFractional(inPixels, outPixels, width, height, HRADIUS); blurFractional(outPixels, inPixels, height, width, VRADIUS); bitmap.setPixels(inPixels, 0, width, 0, 0, width, height); Drawable drawable = new BitmapDrawable(bitmap); return drawable; } /** * 根据ImageView设置高斯模糊 * @param img:ImageView * @return */ public static void BoxBlurFilter(ImageView img) { Bitmap bmp =((BitmapDrawable)img.getDrawable()).getBitmap(); int width = bmp.getWidth(); int height = bmp.getHeight(); int[] inPixels = new int[width * height]; int[] outPixels = new int[width * height]; Bitmap bitmap = Bitmap.createBitmap(width, height,Bitmap.Config.ARGB_8888); bmp.getPixels(inPixels, 0, width, 0, 0, width, height); for (int i = 0; i < ITERATIONS; i++) { blur(inPixels, outPixels, width, height, HRADIUS); blur(outPixels, inPixels, height, width, VRADIUS); } blurFractional(inPixels, outPixels, width, height, HRADIUS); blurFractional(outPixels, inPixels, height, width, VRADIUS); bitmap.setPixels(inPixels, 0, width, 0, 0, width, height); Drawable drawable = new BitmapDrawable(bitmap); img.setImageDrawable(drawable); } /** * 根据项目资源文件图片返回高斯模糊drawable * @param context:上下文 * @param res:资源id */ public static Drawable BoxBlurFilter(Context context, int res) { Bitmap bmp= BitmapFactory.decodeResource(context.getResources(), res); return BoxBlurFilter(bmp); } /** * 根据drawable返回高斯模糊 * @param drawable * @return */ public static Drawable BoxBlurFilter(Drawable drawable) { Bitmap bitmap = ((BitmapDrawable)drawable).getBitmap(); return BoxBlurFilter(bitmap); } /** * 核心代码 * @param in * @param out * @param width * @param height * @param radius */ public static void blur(int[] in, int[] out, int width, int height, float radius) { int widthMinus1 = width - 1; int r = (int) radius; int tableSize = 2 * r + 1; int divide[] = new int[256 * tableSize]; for (int i = 0; i < 256 * tableSize; i++) divide[i] = i / tableSize; int inIndex = 0; for (int y = 0; y < height; y++) { int outIndex = y; int ta = 0, tr = 0, tg = 0, tb = 0; for (int i = -r; i <= r; i++) { int rgb = in[inIndex + clamp(i, 0, width - 1)]; ta += (rgb >> 24) & 0xff; tr += (rgb >> 16) & 0xff; tg += (rgb >> 8) & 0xff; tb += rgb & 0xff; } for (int x = 0; x < width; x++) { out[outIndex] = (divide[ta] << 24) | (divide[tr] << 16) | (divide[tg] << 8) | divide[tb]; int i1 = x + r + 1; if (i1 > widthMinus1) i1 = widthMinus1; int i2 = x - r; if (i2 < 0) i2 = 0; int rgb1 = in[inIndex + i1]; int rgb2 = in[inIndex + i2]; ta += ((rgb1 >> 24) & 0xff) - ((rgb2 >> 24) & 0xff); tr += ((rgb1 & 0xff0000) - (rgb2 & 0xff0000)) >> 16; tg += ((rgb1 & 0xff00) - (rgb2 & 0xff00)) >> 8; tb += (rgb1 & 0xff) - (rgb2 & 0xff); outIndex += height; } inIndex += width; } } public static void blurFractional(int[] in, int[] out, int width, int height, float radius) { radius -= (int) radius; float f = 1.0f / (1 + 2 * radius); int inIndex = 0; for (int y = 0; y < height; y++) { int outIndex = y; out[outIndex] = in[0]; outIndex += height; for (int x = 1; x < width - 1; x++) { int i = inIndex + x; int rgb1 = in[i - 1]; int rgb2 = in[i]; int rgb3 = in[i + 1]; int a1 = (rgb1 >> 24) & 0xff; int r1 = (rgb1 >> 16) & 0xff; int g1 = (rgb1 >> 8) & 0xff; int b1 = rgb1 & 0xff; int a2 = (rgb2 >> 24) & 0xff; int r2 = (rgb2 >> 16) & 0xff; int g2 = (rgb2 >> 8) & 0xff; int b2 = rgb2 & 0xff; int a3 = (rgb3 >> 24) & 0xff; int r3 = (rgb3 >> 16) & 0xff; int g3 = (rgb3 >> 8) & 0xff; int b3 = rgb3 & 0xff; a1 = a2 + (int) ((a1 + a3) * radius); r1 = r2 + (int) ((r1 + r3) * radius); g1 = g2 + (int) ((g1 + g3) * radius); b1 = b2 + (int) ((b1 + b3) * radius); a1 *= f; r1 *= f; g1 *= f; b1 *= f; out[outIndex] = (a1 << 24) | (r1 << 16) | (g1 << 8) | b1; outIndex += height; } out[outIndex] = in[width - 1]; inIndex += width; } } public static int clamp(int x, int a, int b) { return (x < a) ? a : (x > b) ? b : x; }}

最后放上两张对比图