findViewById works only after setContentView has been called on the layout containing the View that needs to be found.
It's possible to remove the Android status bar programmatically, just use the following lines of code, after triggering an orientation change and returning to the original orientation:
this.requestWindowFeature(Window.FEATURE_NO_TITLE); // to remove the title 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