Android任意时刻、任意代码处全屏

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 public void toggleFullscreen(boolean fullScreen)
  {
   //fullScreen为true时全屏，否则相反

      WindowManager.LayoutParams attrs = getWindow().getAttributes();

      if (fullScreen)
      {
          attrs.flags |= WindowManager.LayoutParams.FLAG_FULLSCREEN;
      }
      else
      {
          attrs.flags &= ~WindowManager.LayoutParams.FLAG_FULLSCREEN;
      }

      getWindow().setAttributes(attrs);
  }