Android popup window not filling screen size?

Here you can't use layout which is in your popup window xml. You have to use any View from main layout. Right now I am using FloatingButton as a View to showAtLocation.

fabButton = (ImageButton) findViewById(R.id.activity_profileView_FAB);            fabButton.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(final View v) {                    initiatePopupWindow(v);                }            }); private void initiatePopupWindow(View v) {            try {                //We need to get the instance of the LayoutInflater, use the context of this activity                LayoutInflater inflater = (LayoutInflater) ProfileView.this                        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);                //Inflate the view from a predefined XML layout                View layout = inflater.inflate(R.layout.popup,                        (ViewGroup) findViewById(R.id.popup_element));                // create a 300px width and 470px height PopupWindow                pw = new PopupWindow(layout, 300, 470, true);                // display the popup in the center                pw.showAtLocation(v, Gravity.CENTER, 0, 0);                TextView mResultText = (TextView) layout.findViewById(R.id.server_status_text);                Button cancelButton = (Button) layout.findViewById(R.id.end_data_send_button);                cancelButton.setOnClickListener(cancel_button_click_listener);            } catch (Exception e) {                e.printStackTrace();            }        }

Just change

 pw = new PopupWindow(layout, 300, 470, true);

to like this

pw = new PopupWindow(layout, LinearLayout.LayoutParams.MATCH_PARENT,                LinearLayout.LayoutParams.MATCH_PARENT, true);

and if you need margins on any side do it in popup xml file. Also in xml use android:layout_height="wrap_content". Advantage of this is,- it will look same (if you put margin) in any device screen.