an universal lock screen app demo with "shield" the home key on android 4.0+
参考百度锁屏、Go锁屏的原理，实现了上述各版本通用的锁屏示例app。支持“屏蔽”Android 4.0+的Home键，注意并非是真正的屏蔽，因为4.0之后，系统不允许在应用层屏蔽Home键，这里只是采用了一种巧妙的方式来绕过，就像是屏蔽了Home键一样。
PS：Android 6.0上，此方法对于Home键也不能完美起作用，应该是系统做了更严格的限制。百度锁屏在6.0上跟本demo效果类似，而Go锁屏在6.0上直接崩溃（测试机Nexus 6P）。
PPS：其实现在很多锁屏软件并非必须禁用Home键（关于完全禁用Home键的缺点在博客中也有提到），比如网易音乐、QQ音乐、惠锁屏等，而只是想在手机屏幕点亮时展示自己的一个入口，提供给用户一些有用的信息，如此而已。
详细的原理及实现可参考本人博客。
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