在mediaplayer全屏播放的时候，我可以用键盘上的某一个键调节声音大小，现在我想在屏幕上显示调节的结果就跟我们看电视一样能出来一些标记。当声音变大在屏幕上就增多，当声音变小的时候就减少

得到播放窗口的DC，然后在上面显示一个不同颜色的矩形或者其它形状。

-In mediaplayer full screen, I can use a key on the keyboard to adjust the sound of a size, and now I want to adjust the results displayed on the screen just like watching TV as we can out of a number of tags. When the voice on the screen larger increase in the time when the voice of smaller players to get the window to reduce DC, and then display a different color on top of rectangular or other shapes.