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Window w = getWindow();
WindowManager.LayoutParams layoutParams = w.getAttributes();
//1.下面这句话是修改activity的大小
layoutParams.width = 100;
//2.下面2句话是让activity能够在系统锁屏前显示
w.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
w.addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);