Blur Background Behind AlertDialog

Question

As we know from API 14 the Below Blur has been deprecated

dialog.getWindow().addFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND);  

Is there any alternative for this to make the Screen Blur behind Dialog I have tried FAST blur

Answer 1

Update:

We can also use renderscript api to blur background for API level >= 17 and uses fastblur for API level < 17. Please find below Github project.

- Github Project

- Blog

Steps Using FastBlur

1) Take the Snapshot of Your Background using Below Code

private static Bitmap takeScreenShot(Activity activity)     {         View view = activity.getWindow().getDecorView();         view.setDrawingCacheEnabled(true);         view.buildDrawingCache();         Bitmap b1 = view.getDrawingCache();         Rect frame = new Rect();         activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);         int statusBarHeight = frame.top;         int width = activity.getWindowManager().getDefaultDisplay().getWidth();         int height = activity.getWindowManager().getDefaultDisplay().getHeight();          Bitmap b = Bitmap.createBitmap(b1, 0, statusBarHeight, width, height  - statusBarHeight);         view.destroyDrawingCache();         return b;     } 

use it Like This Bitmap map=takeScreenShot(BlurImageView.this);// Your Actitvity Name

2) Call the Method Bitmap fast=fastblur(map, 10); Got it From Here

    public Bitmap fastblur(Bitmap sentBitmap, int radius) {         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++) {                 // 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);     } 

3) Finally on Button click

btnblur.setOnClickListener(new OnClickListener() {             @Override             public void onClick(View view) {                  AlertDialog.Builder builder=new AlertDialog.Builder(BlurImageView.this,R.style.Theme_D1NoTitleDim);                 builder.setTitle("Content");                 builder.setMessage("CLICK OK to Exit");                 builder.setPositiveButton("ON", new DialogInterface.OnClickListener() {                     @Override                     public void onClick(DialogInterface dialog, int which) {                         back_dim_layout.setVisibility(View.GONE);                         dialog.cancel();                     }                 });                 alert=builder.create();                 Bitmap map=takeScreenShot(BlurImageView.this);                  Bitmap fast=fastblur(map, 10);                 final Drawable draw=new BitmapDrawable(getResources(),fast);                 alert.getWindow().setBackgroundDrawable(draw);                 alert.show();             }         }); 

That's It Now You can see the Blur Image Behind You Activity

Hope this could Help full for AnyOne...