How to make a status bar in java?

Question

Java

How to make a status bar for an android smartphone in java?
For example, as in (Android L)

Answer 1

Window window = activity.getWindow();
window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
window.setStatusBarColor(activity.getResources().getColor(R.color.твой_primaryColor));

To change color:
getWindow().setStatusBarColor(Color.RED);