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