android uri , file , string 互转

1：android Uri 介绍

http://www.cnblogs.com/lingyun1120/archive/2012/04/18/2455212.html

2:File 转成Uri

<span style="font-size:18px;"> File file = null;
 Uri uri = Uri.fromFile(file)</span>

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原文：http://blog.csdn.net/ab601026460/article/details/32132633