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Android模糊处理实现图片毛玻璃效果

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这篇文章主要介绍了Android模糊处理实现图片毛玻璃效果,需要的朋友可以参考下

本文实例讲解了android 虚化图片、模糊图片、图片毛玻璃效果的实现方法，具体内容如下

效果如图：

Android模糊处理实现图片毛玻璃效果

在android可以用renderscript方便的实现这个方法：

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private void blur(bitmap bkg, view view, float radius) {
  bitmap overlay = bitmap.createbitmap(view.getmeasuredwidth(), view.getmeasuredheight(), bitmap.config.argb_8888);
  canvas canvas = new canvas(overlay);
  canvas.drawbitmap(bkg, -view.getleft(), -view.gettop(), null);
  renderscript rs = renderscript.create(this);
  allocation overlayalloc = allocation.createfrombitmap(rs, overlay);
  scriptintrinsicblur blur = scriptintrinsicblur.create(rs, overlayalloc.getelement());
  blur.setinput(overlayalloc);
  blur.setradius(radius);
  blur.foreach(overlayalloc);
  overlayalloc.copyto(overlay);
  view.setbackground(new bitmapdrawable(getresources(), overlay));
  rs.destroy();
 }

但是renderscript的这个方法需要android api17，也就说需要在android 4.2上才能实现。
低于android4.2可以用java原生代码实现。但是效率会低不少：这完全是一种妥协的方式，不推荐。

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/*
  * this method was copied from http://stackoverflow.com/a/10028267/694378.
  * the only modifications i've made are to remove a couple of log
  * statements which could slow things down slightly.
  */
 public bitmap fastblur(bitmap sentbitmap, int radius) {
 
  // stack blur v1.0 from
  // http://www.quasimondo.com/stackblurforcanvas/stackblurdemo.html
  //
  // java author: mario klingemann <mario at quasimondo.com>
  // http://incubator.quasimondo.com
  // created feburary 29, 2004
  // android port : yahel bouaziz <yahel at kayenko.com>
  // http://www.kayenko.com
  // 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.com>
 
  bitmap 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);
 
  return (bitmap);
 }

以上就是本文的全部内容，希望对大家学习android软件编程有所帮助。