Get notification before deleting the file in Android

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Java

Mobile

Android

I want to save the deleted files like Dumpster. I am using the fileobserver, but its not working . Its notifying after the file deletion.

FileObserver Observer = null; 
Observer = new FileObserver(observepath) 
{
    @Override public void onEvent(int event, String path) 
   {
        if ((FileObserver.DELETE & event)!=0 || (FileObserver.DELETE_SELF & event)!=0) 
        {
            Toast.makeText(MainActivity.this, path, Toast.LENGTH_SHORT).show();
        }
   }
}

Here the toast message is coming after the file deletion i checked this by debug mode by putting break point there. And i used "File.delete()" to delete the file. Now my question is after invoking the file.delete() is it possible to notify ?