//设置窗体全屏
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

//设置窗体始终点亮
getWindow().setFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON,
      WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

//设置窗体背景模糊

getWindow().setFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND,
                WindowManager.LayoutParams.FLAG_BLUR_BEHIND);

附上：http://www.cnblogs.com/salam/archive/2010/11/30/1892143.html不错的总结