android弹出窗口在后台运行

Question

how do I set android popup window to run in background. I mean, I dont need to make the app open, but it will run in background, and when call, popup will appeared on android main menu. I got the handler script, I just only want to know how do i set this popup to show on any screen, just like toast message will do.

LayoutInflater layoutInflater  =         (LayoutInflater)MainActivity.this.getSystemService(LAYOUT_INFLATER_SERVICE);    
            final View popupView = layoutInflater.inflate(R.layout.popup, null);  

            final PopupWindow popupWindowDi = new PopupWindow(popupView,      LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);  

            Button btnDismiss = (Button)popupView.findViewById(R.id.dismiss);                          
            btnDismiss.setOnClickListener(new Button.OnClickListener(){
            @Override
            public void onClick(View v) {
            popupWindowDi.dismiss();
            }});
            popupWindowDi.showAsDropDown(btnOpenPopup, 50, -30);

Answer 1

What you need a system dialog which is shown over all activities-the facebook implements chat heads.Use this in your code:

popup.getWindow().setType(
WindowManager.LayoutParams.TYPE_SYSTEM_DIALOG);
popup.show();

Make sure you add SYSTEM_ALERT_WINDOW permission in your manifest.refer http://developer.android.com/reference/android/Manifest.permission.html#SYSTEM_ALERT_WINDOW