android屏蔽home键

@Override 
public boolean onKeyDown(int keyCode, KeyEvent event){ 
if(KeyEvent.KEYCODE_HOME==keyCode) 
android.os.Process.killProcess(android.os.Process.myPid()); 
return super.onKeyDown(keyCode, event); 
} 
@Override 
public void onAttachedToWindow(){ 
this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD); 
super.onAttachedToWindow(); 
} 

 权限代码:<uses-permission android:name="android.permission.DISABLE_KEYGUARD"></uses-permission>