Android实现图片毛玻璃背景效果

本文实例为大家分享了Android实现毛玻璃背景效果的具体代码，供大家参考，具体内容如下

import android.content.Context;
import android.graphics.Bitmap; 

/**
 * Created by abel.zhang on 2016/8/9.
 * 图片的毛玻璃效果
 */
public class GsdFastBlur { 

 /**
  *
  * @param context
  * @param sentBitmap
  * @param radius 12 模糊程度
  * @return
  */
 public static Bitmap fastblur(Context context, Bitmap sentBitmap, int radius) { 

  if (sentBitmap==null){
   return null;
  }
  Bitmap bitmap =null;
  try {
   bitmap = sentBitmap.copy(sentBitmap.getConfig(), true);
  }catch (Exception e){
   e.printStackTrace();
   return null;
  } 

  if (radius < 1) {
   return (null);
  } 

  int w = bitmap.getWidth();
  int h = bitmap.getHeight(); 

  int[] pix = new int[w * h];
//  Log.e("pix", w + " " + h + " " + pix.length);
  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 temp = 256 * divsum;
  int dv[] = new int[temp];
  for (i = 0; i < temp; 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;
   }
  } 

//  Log.e("pix", w + " " + h + " " + pix.length);
  bitmap.setPixels(pix, 0, w, 0, 0, w, h);
  return (bitmap);
 } 

}

效果图：

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