Answers for "how to change android studio status bar color into black"

change status bar color android programmatically

public void statuscolor(){
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            Window window = getWindow();
            window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
            window.setStatusBarColor(Color.parseColor(getPreferences().getString(Constant.SECONDARY_COLOR, Constant.SECONDARY_COLOR)));
        }
    }

android status bar color

<!-- in themes -->
<item name="android:statusBarColor">@color/color</item>