To remove the Android status bar, execute the following statements in the onCreate method before making a call to setContentView(R.layout.main);
int flag = WindowManager.LayoutParams.FLAG_FULLSCREEN;getWindow().setFlags(flag, flag);
In 2017, with the release of Delphi 10.2 Tokyo, Embarcadero introduced a specialized implementation of the Observer pattern into the System.Classes unit. While it has been in the wild for 9 years, it remains a "hidden" architecture for many, primarily because it serves as the invisible engine behind LiveBindings. Other than live bindings, you can also use the Observer pattern as a way to update component settings to the Windows registry, an .ini file, or persist it elsewhere.
System.Classes