源代码介绍
SD卡上的铃声文件可以导入数据库，方便设置。文件浏览的代码是《Revealing the Secrets of Android Application Development》一书中的例子，甚至是图片……然后在上面加了一个复选框，可以选择多个屏幕，就可以了。
(Source code introduction
The ringing tone file on the SD card can be imported into the database for easy setting. The code for file browsing is an example or even a picture in the book reviewing the secrets of Android Application Development... Then a check box is added on it to select multiple screens.)
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