android 捕獲並處理HOME鍵

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();     
}   
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;   
                    }   
                }   
            }   
\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。

 摘自 xiaoxiaobian3310903的專欄