SystemBarHelper.java 文件源码

public static void immersiveStatusBar(Window window, @FloatRange(from = 0.0d, to = 1.0d)
        float alpha) {
    if (VERSION.SDK_INT >= 19) {
        if (VERSION.SDK_INT >= 21) {
            window.clearFlags(67108864);
            window.addFlags(Integer.MIN_VALUE);
            window.setStatusBarColor(0);
            window.getDecorView().setSystemUiVisibility((window.getDecorView()
                    .getSystemUiVisibility() | 1024) | 256);
        } else {
            window.addFlags(67108864);
        }
        ViewGroup decorView = (ViewGroup) window.getDecorView();
        View rootView = ((ViewGroup) window.getDecorView().findViewById(16908290)).getChildAt
                (0);
        int statusBarHeight = getStatusBarHeight(window.getContext());
        if (rootView != null) {
            LayoutParams lp = (LayoutParams) rootView.getLayoutParams();
            ViewCompat.setFitsSystemWindows(rootView, true);
            lp.topMargin = -statusBarHeight;
            rootView.setLayoutParams(lp);
        }
        setTranslucentView(decorView, alpha);
    }
}