Can I create an UI or a widget in Android that will sit on top of all applications? There are applications that have widgets like this. One example has a camera icon on top of all the applications that, when clicked, will capture the screen.
If you want to just display something, you can display it on top of everything even the lockscreen.
If you want something to be clickable, you can display it on top of anything except the lockscreen.
Here’s a sample, modify to your needs:
Create a service and do the following:
//These three are our main components. WindowManager wm; LinearLayout ll; WindowManager.LayoutParams ll_lp; //Just a sample layout parameters. ll_lp = new WindowManager.LayoutParams(); ll_lp.format = PixelFormat.TRANSLUCENT; ll_lp.height = WindowManager.LayoutParams.FILL_PARENT; ll_lp.width = WindowManager.LayoutParams.FILL_PARENT; ll_lp.gravity = Gravity.CLIP_HORIZONTAL | Gravity.TOP; //This one is necessary. ll_lp.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT; //Play around with these two. ll_lp.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE; ll_lp.flags = ll_lp.flags | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE; //This is our main layout. ll = new LinearLayout(this); ll.setBackgroundColor(android.graphics.Color.argb(0, 0, 0, 0)); ll.setHapticFeedbackEnabled(true); //And finally we add what we created to the screen. wm.addView(ll, ll_lp);
The following are more options for how the view is displayed.
This will make it an overlay on top of everything (including lock screen), but not clickable.
This will make it clickable, but it won’t be over the lock screen
This will make it above everything (including lock screen) AND clickable.
One thing to note about using “TYPE_SYSTEM_ERROR”. If you wire-in a click event, anything it invokes will happen behind the lock screen.