I want to make an app that shows a popupwindow of the text user copies anywhere on his mobile.i have less idea about how to run such a task.please if anyone can direct me the way.thanks in advance
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A clever use of SYSTEM_ALERT_WINDOW could achieve what you are looking for.
Allows an application to open windows using the type TYPE_SYSTEM_ALERT, shown on top of all other applications. Very few applications should use this permission; these windows are intended for system-level interaction with the user.
Constant Value: "android.permission.SYSTEM_ALERT_WINDOW"
After creating a Service that handles the creation and data population of your popup view, you call it like this:
startService(new Intent(context, MyCustomService.class));