在activity中加上下面这段代码就可以屏蔽home

Java代码 

  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.     }  

@Override

public boolean onKeyDown(int keyCode, KeyEvent event)

{

  // TODO Auto-generated method stub

  // 按下键盘上返回按钮

 

  if (keyCode == KeyEvent.KEYCODE_HOME)

  {

                        Log.i("TAG","home");

   System.exit(0);

   return true;

  }

  else

   return super.onKeyDown(keyCode, event);

 

}

 

前提是，要重写onAttachedToWindow()这个方法。

 

Java代码 

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

@Override

public void onAttachedToWindow()

{

  this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);

  super.onAttachedToWindow();

}

 

 

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

Java代码 

  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.             }  

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;

                    }

                }

            }

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