设置磨砂效果的背景图

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设置磨砂效果的背景图

这个是做东西的时候从同学那里拷来的类，还不错，自己记录一下。我在用的时候只试过整个布局文件的背景图，其他情况暂未尝试，所以大家可以尝试使用。
这里我就直接把这个工具类贴出来。

先贴调用的代码吧。

//初始化背景private void wallpaperinit(){Resources res=getResources();//我做的时候是直接放在资源文件夹Mipmap下的Bitmap bitmap= BitmapFactory.decodeResource(res,R.mipmap.wallpaper1);//设置第二个参数调整磨砂效果，1就是平常较常见的磨砂效果，其他数值大家可以自行尝试BitmapDrawable bd=new BitmapDrawable(res,BlurUtil.doBlur(bitmap,1,15));relativeLayout.setBackground(bd);}

工具类 BlurUtil

import android.graphics.Bitmap;
import android.media.ThumbnailUtils;
/*** 图片虚化辅助类* Created by jay on 11/7/15.*/
public class BlurUtil {private static final String TAG = BlurUtil.class.getSimpleName();/*** 对图片进行毛玻璃化* @param sentBitmap 位图* @param radius 虚化程度* @param canReuseInBitmap 是否重用* @return 位图*/public static Bitmap doBlur(Bitmap sentBitmap, int radius, boolean canReuseInBitmap) {// Stack Blur v1.0 from// .html//// Java Author: Mario Klingemann <mario at quasimondo>// // created Feburary 29, 2004// Android port : Yahel Bouaziz <yahel at kayenko>// // ported april 5th, 2012// This is a compromise between Gaussian Blur and Box blur// It creates much better looking blurs than Box Blur, but is// 7x faster than my Gaussian Blur implementation.//// I called it Stack Blur because this describes best how this// filter works internally: it creates a kind of moving stack// of colors whilst scanning through the image. Thereby it// just has to add one new block of color to the right side// of the stack and remove the leftmost color. The remaining// colors on the topmost layer of the stack are either added on// or reduced by one, depending on if they are on the right or// on the left side of the stack.//// If you are using this algorithm in your code please add// the following line://// Stack Blur Algorithm by Mario Klingemann <mario@quasimondo>Bitmap bitmap;if (canReuseInBitmap) {bitmap = sentBitmap;} else {bitmap = sentBitmap.copy(sentBitmap.getConfig(), true);}if (radius < 1) {return (null);}int w = bitmap.getWidth();int h = bitmap.getHeight();int[] pix = new int[w * h];bitmap.getPixels(pix, 0, w, 0, 0, w, h);int wm = w - 1;int hm = h - 1;int wh = w * h;int div = radius + radius + 1;int r[] = new int[wh];int g[] = new int[wh];int b[] = new int[wh];int rsum, gsum, bsum, x, y, i, p, yp, yi, yw;int vmin[] = new int[Math.max(w, h)];int divsum = (div + 1) >> 1;divsum *= divsum;int dv[] = new int[256 * divsum];for (i = 0; i < 256 * divsum; i++) {dv[i] = (i / divsum);}yw = yi = 0;int[][] stack = new int[div][3];int stackpointer;int stackstart;int[] sir;int rbs;int r1 = radius + 1;int routsum, goutsum, boutsum;int rinsum, ginsum, binsum;for (y = 0; y < h; y++) {rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;for (i = -radius; i <= radius; i++) {p = pix[yi + Math.min(wm, Math.max(i, 0))];sir = stack[i + radius];sir[0] = (p & 0xff0000) >> 16;sir[1] = (p & 0x00ff00) >> 8;sir[2] = (p & 0x0000ff);rbs = r1 - Math.abs(i);rsum += sir[0] * rbs;gsum += sir[1] * rbs;bsum += sir[2] * rbs;if (i > 0) {rinsum += sir[0];ginsum += sir[1];binsum += sir[2];} else {routsum += sir[0];goutsum += sir[1];boutsum += sir[2];}}stackpointer = radius;for (x = 0; x < w; x++) {r[yi] = dv[rsum];g[yi] = dv[gsum];b[yi] = dv[bsum];rsum -= routsum;gsum -= goutsum;bsum -= boutsum;stackstart = stackpointer - radius + div;sir = stack[stackstart % div];routsum -= sir[0];goutsum -= sir[1];boutsum -= sir[2];if (y == 0) {vmin[x] = Math.min(x + radius + 1, wm);}p = pix[yw + vmin[x]];sir[0] = (p & 0xff0000) >> 16;sir[1] = (p & 0x00ff00) >> 8;sir[2] = (p & 0x0000ff);rinsum += sir[0];ginsum += sir[1];binsum += sir[2];rsum += rinsum;gsum += ginsum;bsum += binsum;stackpointer = (stackpointer + 1) % div;sir = stack[(stackpointer) % div];routsum += sir[0];goutsum += sir[1];boutsum += sir[2];rinsum -= sir[0];ginsum -= sir[1];binsum -= sir[2];yi++;}yw += w;}for (x = 0; x < w; x++) {rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;yp = -radius * w;for (i = -radius; i <= radius; i++) {yi = Math.max(0, yp) + x;sir = stack[i + radius];sir[0] = r[yi];sir[1] = g[yi];sir[2] = b[yi];rbs = r1 - Math.abs(i);rsum += r[yi] * rbs;gsum += g[yi] * rbs;bsum += b[yi] * rbs;if (i > 0) {rinsum += sir[0];ginsum += sir[1];binsum += sir[2];} else {routsum += sir[0];goutsum += sir[1];boutsum += sir[2];}if (i < hm) {yp += w;}}yi = x;stackpointer = radius;for (y = 0; y < h; y++) {// Preserve alpha channel: ( 0xff000000 & pix[yi] )pix[yi] = (0xff000000 & pix[yi]) | (dv[rsum] << 16) | (dv[gsum] << 8) | dv[bsum];rsum -= routsum;gsum -= goutsum;bsum -= boutsum;stackstart = stackpointer - radius + div;sir = stack[stackstart % div];routsum -= sir[0];goutsum -= sir[1];boutsum -= sir[2];if (x == 0) {vmin[y] = Math.min(y + r1, hm) * w;}p = x + vmin[y];sir[0] = r[p];sir[1] = g[p];sir[2] = b[p];rinsum += sir[0];ginsum += sir[1];binsum += sir[2];rsum += rinsum;gsum += ginsum;bsum += binsum;stackpointer = (stackpointer + 1) % div;sir = stack[stackpointer];routsum += sir[0];goutsum += sir[1];boutsum += sir[2];rinsum -= sir[0];ginsum -= sir[1];binsum -= sir[2];yi += w;}}bitmap.setPixels(pix, 0, w, 0, 0, w, h);
//        print("虚化后 ",bitmap);return (bitmap);}/*** 对图片进行毛玻璃化* @param originBitmap 位图* @param scaleRatio 缩放比率* @param blurRadius 毛玻璃化比率，虚化程度* @return 位图*/public static Bitmap doBlur(Bitmap originBitmap, int scaleRatio, int blurRadius){
//        print("原图：：",originBitmap);Bitmap scaledBitmap = Bitmap.createScaledBitmap(originBitmap,originBitmap.getWidth() / scaleRatio,originBitmap.getHeight() / scaleRatio,false);Bitmap blurBitmap = doBlur(scaledBitmap, blurRadius, false);scaledBitmap.recycle();return blurBitmap;}
//    private static void print(String tag, Bitmap originBitmap) {
//        StringBuilder sb = new StringBuilder(tag);
//        sb.append( String.format("  width=%s,",originBitmap.getWidth()));
//        sb.append( String.format(" height=%s,",originBitmap.getHeight()));
//        Log.i(TAG,sb.toString());
//    }/*** 对图片进行 毛玻璃化，虚化* @param originBitmap 位图* @param width 缩放后的期望宽度* @param height 缩放后的期望高度* @param blurRadius 虚化程度* @return 位图*/public static Bitmap doBlur(Bitmap originBitmap,int width,int height,int blurRadius){Bitmap thumbnail = ThumbnailUtils.extractThumbnail(originBitmap, width, height);Bitmap blurBitmap = doBlur(thumbnail, blurRadius, true);thumbnail.recycle();return blurBitmap;}
}

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