/** * 設置毛玻璃背景 * 背景圖片 Bitmap */private void setBlurBackground(Bitmap bmp){  final Bitmap blurBmp = BlurUtil.fastblur(ParentCircleInfoActivity.this, bmp, 10);//0-25，表示模糊值  final Drawable drawable = ImageUtil.getDrawable(this,blurBmp);//將bitmap類型圖片 轉為 Drawable類型  mRLHead.post(new Runnable() //調用UI線程  {    @Override    public void run()    {      mRLHead.setBackgroundDrawable(drawable);    }  });}bitmap 轉 drawable:/** * bitmap -> drawable * @param context * @param bm * @return */public static Drawable getDrawable(Context context, Bitmap bm){  BitmapDrawable bd= new BitmapDrawable(context.getResources(),bm);  return bd;}使用到的工具類：public class BlurUtil {   @SuppressLint("NewApi")  public static Bitmap fastblur(Context context, Bitmap sentBitmap, int radius)   {    if (VERSION.SDK_INT > 16)    {         Bitmap bitmap = sentBitmap.copy(sentBitmap.getConfig(), true);      final RenderScript rs = RenderScript.create(context);     final Allocation input = Allocation.createFromBitmap(rs,sentBitmap, Allocation.MipmapControl.MIPMAP_NONE,Allocation.USAGE_SCRIPT);     final Allocation output = Allocation.createTyped(rs,input.getType());     final ScriptIntrinsicBlur script = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));     script.setRadius(radius);/* e.g. 3.f */     script.setInput(input);     script.forEach(output);          output.copyTo(bitmap);         return bitmap;     }      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];    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 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++)       {        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);  }}