说明：  本文档问题来自天极论坛嵌入式开发版，只供学习讨论用。 1、mediaplayer全屏播放，如何改变声音大小。 2、安装EVC4.0，写入中文时显示乱码。
(The issue of this document from embedded development??Forum version, only to learn discussion. 1, mediaplayer full-screen playback, how to change the size of the voice. 2, installation EVC4.0, write Chinese characters when displayed.)