Android: Set custom colors on status bar.

StatusbarColor.txt

//Implement outside the onCreate method
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public static void setStatusBarGradiant(Activity activity) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        Window window = activity.getWindow();
        window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
        window.setStatusBarColor(ContextCompat.getColor(activity, R.color.colorPrimaryDark)); //Change colorPrimaryDark to customize
    }
}