Problem:

I have an activity which I am using to host three fragments connected to a BottomNavigationView, on users touch events I want to change status bar colours to a different color for each of the fragments.

If I use below code in each of the fragment's onViewCreated or onCreateView method it changes activity's status bar colour white or colour light for the fragment using getActivity() method.

getActivity().getWindow.setStatusBarColor(Color.White);

using this give code will only work for a white color and this solution does not solve the problem. So after few searches here a solution I have been able to come up with...

Solution:

/**
 * change the status bar color programmatically (and provided the device has Android 
 *  5.0)
 * then you can use Window.setStatusBarColor().
 * It shouldn't make a difference whether the activity is derived from Activity or 
 * ActionBarActivity.
 */
    private fun setStatusBarColor(color: Int) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            val window: Window = window 
            window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS)
            window.statusBarColor = color
        }
    }

That's it. Simple Implementation.

Code: https://github.com/chydee/StatusBar-Tutorial

Happy Coding ;)