Android, how to blur/glass/frost current activity

Question

Basically

In an activity, I have a ListView. When I select an item, an transparent activity opens as a small box. When this box appears, you can still view the previ

Answer 1

For API < 14, you could use the flag WindowManager.LayoutParams.FLAG_BLUR_BEHIND, but it's been deprecated and built-in blurring is no longer supported on higher APIs

However, you could do this with a regular view or overlay. What you want to do is:

• Create a Bitmap from your activity's overall layout (see here for example)
• Blur that bitmap with whatever method you want(a few examples here)
• Add(or unhide) a View in your layout that covers everything. Set bkg to blurred Bitmap
• Open your dialog/transparent activity
• When it closes, either remove the View, or setVisibility(GONE) if you'll be using it again.