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Android 禁用以及捕捉home键

最近要做个小项目,其中有需要禁止home键的需求,一开始以为不可以,感觉得root一下才行,后来查了一下,发现还是不少朋友都实现了这个功能,现在也引用一下,供大家参考一下:

1. 在activity中加上这段代码就可以屏蔽home键(onKeyDown事件会捕捉到home键)。


public void onAttachedToWindow()   
{     
       this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);        
       super.onAttachedToWindow();     
}   
  
  2.因为android系统自己对与home键power键在PhoneWindowManager中做了处理,不会返回到上层应用的。以下为系统源码
\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这一句,我们可以看到,android对于锁屏特殊判断了,所以我就模拟这个进行的实现,只是有一点,activity中重写onAttachedToWindow()方法需要api 5以上。

 摘自 xiaoxiaobian3310903的专栏

posted on 2013-09-13 09:40  咖啡猫1292  阅读(676)  评论(1编辑  收藏  举报