Blur or dim background when Android PopupWindow active

For me, something like Abdelhak Mouaamou's answer works, tested on API level 16 and 27.

Instead of using popupWindow.getContentView().getParent() and casting the result to View (which crashes on API level 16 cause there it returns a ViewRootImpl object which isn't an instance of View) I just use .getRootView() which returns a view already, so no casting required there.

Hope it helps someone :)

complete working example scrambled together from other stackoverflow posts, just copy-paste it, e.g., in the onClick listener of a button:

// inflate the layout of the popup window
LayoutInflater inflater = (LayoutInflater)getSystemService(LAYOUT_INFLATER_SERVICE);
if(inflater == null) {
    return;
}
//View popupView = inflater.inflate(R.layout.my_popup_layout, null); // this version gives a warning cause it doesn't like null as argument for the viewRoot, c.f. https://stackoverflow.com/questions/24832497 and https://stackoverflow.com/questions/26404951
View popupView = View.inflate(MyParentActivity.this, R.layout.my_popup_layout, null);

// create the popup window
final PopupWindow popupWindow = new PopupWindow(popupView,
        LinearLayout.LayoutParams.WRAP_CONTENT,
        LinearLayout.LayoutParams.WRAP_CONTENT,
        true // lets taps outside the popup also dismiss it
        );

// do something with the stuff in your popup layout, e.g.:
//((TextView)popupView.findViewById(R.id.textview_popup_helloworld))
//      .setText("hello stackoverflow");

// dismiss the popup window when touched
popupView.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            popupWindow.dismiss();
            return true;
        }
});

// show the popup window
// which view you pass in doesn't matter, it is only used for the window token
popupWindow.showAtLocation(view, Gravity.CENTER, 0, 0);
//popupWindow.setOutsideTouchable(false); // doesn't seem to change anything for me

View container = popupWindow.getContentView().getRootView();
if(container != null) {
    WindowManager wm = (WindowManager)getSystemService(Context.WINDOW_SERVICE);
    WindowManager.LayoutParams p = (WindowManager.LayoutParams)container.getLayoutParams();
    p.flags = WindowManager.LayoutParams.FLAG_DIM_BEHIND;
    p.dimAmount = 0.3f;
    if(wm != null) {
        wm.updateViewLayout(container, p);
    }
}

Maybe this repo will help for you:BasePopup

This is my repo, which is used to solve various problems of PopupWindow.

In the case of using the library, if you need to blur the background, just call setBlurBackgroundEnable(true).

See the wiki for more details.（Language in zh-cn）

BasePopup:wiki

findViewById(R.id.drawer_layout).setAlpha((float) 0.7);

R.id.drawer_layout is the id of the layout of which you want to dim the brightness.

ok, so i follow uhmdown's answer for dimming background activity when pop window is open. But it creates problem for me. it was dimming activity and include popup window (means dimmed-black layered on both activity and popup also, it can not be separate them).

so i tried this way,

create an dimming_black.xml file for dimming effect,

 <?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid android:color="#33000000" />
</shape>

And add as background in FrameLayout as root xml tag, also put my other controls in LinearLayout like this layout.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@drawable/ff_drawable_black">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:layout_gravity="bottom"
        android:background="@color/white">

        // other codes...
    </LinearLayout>

</FrameLayout>

at last i show popup on my MainActivity with some extra parameter set as below.

           //instantiate popup window
            popupWindow = new PopupWindow(viewPopup, LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT, true);

            //display the popup window
            popupWindow.showAtLocation(layout_ff, Gravity.BOTTOM, 0, 0);

Result:

it works for me, also solved problem as commented by BaDo. With this Actionbar also can be dimmed.

P.s i am not saying uhmdown's is wrong. i learnt form his answer and try to evolve for my problem. I also confused whether this is a good way or not.

Any suggestions is also appreciated also sorry for my bad English.

Since You are trying to pop up your dialog window by blurring the background screen, You must use this set of lines. You need to fetch the dialog attributes first, then set up some alpha values for the dialog attributes.

Now, your dialog with blur background is ready. But the important factor is to set a Flag FLAG_DIM_BEHIND for the window.

Now the result is yours. Hope it will helpful for someone...

            WindowManager.LayoutParams lp = dialog.getWindow().getAttributes();
            lp.dimAmount=0.6f;
            dialog.getWindow().setAttributes(lp);
            dialog.getWindow().addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND);