android擒获Home键的方法

Level5以上(包含)中，Activity类中有如下方法:
public void onAttachedToWindow ()
Since: API Level 5

Called when the main window associated with the activity has been attached to the window manager. See View.onAttachedToWindow() for more information.

1. private?boolean?catchHomeKey?=?false;??
2. ????@Override??
3. ????????public?void?onAttachedToWindow()?{??
4. ????????????????//?TODO?Auto-generated?method?stub??
5. ????????????if(catchHomeKey)?{??
6. ????????????????????this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);??
7. ????????????}??
8. ????????????????super.onAttachedToWindow();??
9. ????????}??
10. ????????@Override??
11. ????????public?boolean?onKeyDown(int?keyCode,?KeyEvent?event)?{??
12. ????????????????//?TODO?Auto-generated?method?stub??
13. ????????????????if(keyCode?==?KeyEvent.KEYCODE_HOME)?{??
14. ????????????????????????Log.e(TAG,?"Home?key?down");??
15. ????????????????}??
16. ????????????????return?super.onKeyDown(keyCode,?event);??
17. ????????}?
    
18. 重写Activity中的onAttachedToWindow方法，设置Type，就能捕获到Home键。
    当不需要捕获时，删除setType这一行就OK

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