In this article, you will learn how to change the colour of the Action Bar in an Android App. The Status bar, a component of the Android System UI, persistently displays important information to users. This article describes how to customize the Status bar system icons. Using System UI Tuner on Stock Android: Pull down twice from the top of the screen. To learn more about overlaying resources, see Customizing System UI on source.android.com. Let’s check why fitsSystemWindows = true works for CoordinatorLayout and doesn’t work for FrameLayout and how to fix it.. If you just want to hide the status bar just use this line. getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);... Switch (On/Off) Tutorial With Example In Android Studio. Overlays for Specific Icons React Native StatusBar. In this lesson, you would learn how to hide the status bar and action bar in android studio. You can do something like below for appropriately setting theme on your particular activity -