沉浸式

// 系统状态栏透明
if (Build.VERSION.SDK_INT >=21){
    View decorView = getWindow().getDecorView();
    int option = View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
            | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
            | View.SYSTEM_UI_FLAG_LAYOUT_STABLE;
    decorView.setSystemUiVisibility(option);
    getWindow().setNavigationBarColor(Color.TRANSPARENT);
    getWindow().setStatusBarColor(Color.TRANSPARENT);
}