Android 4.4 上实现透明导航栏和状态栏 Translucent system bar

Translucent system UI styling
To get the most impact out of your content, you can now use new window styles and themes to request translucent system UI, including both the status bar and navigation bar. To ensure the legibility of navigation bar buttons or status bar information, subtle gradients is shown behind the system bars. A typical use-case would be an app that needs to show through to a wallpaper.

<style name="Theme.Timetodo" parent="@android:style/Theme.Holo.Light">
    <!-- translucent system bars -->
    <item name="android:windowTranslucentStatus">true</item>
    <item name="android:windowTranslucentNavigation">true</item>
</style>

private void initSystemBar() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
        setTranslucentStatus(true);
        SystemBarTintManager tintManager = new SystemBarTintManager(this);
        tintManager.setStatusBarTintEnabled(true);
        tintManager.setStatusBarTintResource(R.color.actionbar_bg);
        SystemBarConfig config = tintManager.getConfig();
        listViewDrawer.setPadding(0, config.getPixelInsetTop(true), 0, config.getPixelInsetBottom());
    }
}