Android屏蔽home键

在activity中加上下面这段代码就可以屏蔽home

1. @Override
   
2. public boolean onKeyDown(int keyCode, KeyEvent event)
   
3. {
   
4. // TODO Auto-generated method stub
   
5. // 按下键盘上返回按钮
   
6. 
   
7. if (keyCode == KeyEvent.KEYCODE_HOME)
   
8. {
   
9. Log.i("TAG","home");
   
10. System.exit(0);
    
11. return true;
    
12. }
    
13. else
    
14. return super.onKeyDown(keyCode, event);
    
15. 
    
16. }

复制代码

前提是，要重写onAttachedToWindow()这个方法。

1. @Override
   
2. public void onAttachedToWindow()
   
3. {
   
4. this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);
   
5. super.onAttachedToWindow();
   
6. }

复制代码

因为 android系统自己对home键在PhoneWindowManager中做了处理，不会返回到上层应用。查看源代码：

\frameworks\policies\base\phone\com\android\internal\policy\impl\PhoneWindowManager.java 1089行

1. if (code == KeyEvent.KEYCODE_HOME) {
   
2. // If a system window has focus, then it doesn't make sense
   
3. // right now to interact with applications.
   
4. WindowManager.LayoutParams attrs = win != null ? win.getAttrs() : null;
   
5. if (attrs != null) {
   
6. final int type = attrs.type;
   
7. if (type == WindowManager.LayoutParams.TYPE_KEYGUARD
   
8. || type == WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG) {
   
9. // the "app" is keyguard, so give it the key
   
10. return false;
    
11. }
    
12. final int typeCount = WINDOW_TYPES_WHERE_HOME_DOESNT_WORK.length;
    
13. for (int i=0; i<typeCount; i++) {
    
14. if (type == WINDOW_TYPES_WHERE_HOME_DOESNT_WORK[i]) {
    
15. // don't do anything, but also don't pass it to the app
    
16. return true;
    
17. }
    
18. }
    
19. }

复制代码

注意，activity中重写onAttachedToWindow（）方法需要api 5以上