Android 屏蔽返回键、菜单键和Home键

//重写 public  void onAttachedToWindow ( )  {          this . getWindow ( ) . setType ( WindowManager. LayoutParams . TYPE_KEYGUARD ) ;             super . onAttachedToWindow ( ) ;      } 以上方法只针对2.3系统有效,但是在4.0后就没有效果了,要实现如下 public static final int FLAG_HOMEKEY_DISPATCHED = 0x80000000;//定义屏蔽参数    <uses-permission android:name="android.permission.DISABLE_KEYGUARD" /> //权限  this.getWindow().setFlags(FLAG_HOMEKEY_DISPATCHED, FLAG_HOMEKEY_DISPATCHED);  //onCreate中实现             // 屏蔽返回键、菜单键、home键、音量键 @Override public boolean onKeyDown(int keyCode, KeyEvent event) { // TODO Auto-generated method stub switch(keyCode){ case KeyEvent.KEYCODE_BACK: case KeyEvent.KEYCODE_HOME: case KeyEvent.KEYCODE_MENU: case KeyEvent.KEYCODE_VOLUME_DOWN: case KeyEvent.KEYCODE_VOLUME_UP: case KeyEvent.KEYCODE_VOLUME_MUTE: return true; default: return false                          }}