android 捕獲並處理HOME鍵

轉自：http://zhifeiji512.iteye.com/blog/1055358

1. 在activity中加上這段代碼就可以屏蔽home鍵（onKeyDown事件會捕捉到home鍵）。

public void onAttachedToWindow()  {           this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);              super.onAttachedToWindow();    }  

2.因為android系統自己對與home鍵power鍵在PhoneWindowManager中做了處理，不會返回到上層應用的。以下為系統源碼：

\frameworks\policies\base\phone\com\android\internal\policy\impl\PhoneWindowManager.java 1089行     if (code == KeyEvent.KEYCODE_HOME) {                 // If a system window has focus, then it doesn't make sense              // right now to interact with applications.              WindowManager.LayoutParams attrs = win != null ? win.getAttrs() : null;              if (attrs != null) {                  final int type = attrs.type;                  if (type == WindowManager.LayoutParams.TYPE_KEYGUARD                          || type == WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG) {                      // the "app" is keyguard, so give it the key                      return false;                  }                  final int typeCount = WINDOW_TYPES_WHERE_HOME_DOESNT_WORK.length;                  for (int i=0; i<typeCount; i++) {                      if (type == WINDOW_TYPES_WHERE_HOME_DOESNT_WORK[i]) {                          // don't do anything, but also don't pass it to the app                          return true;                      }                  }              }  

type ==
WindowManager.LayoutParams.TYPE_KEYGUARD這一句，我們可以看到，android對於鎖屏特殊判斷了，所以我就類比這個進行的實現，只是有一點，activity中重寫onAttachedToWindow（）方法需要api 5以上。