这个简单的范例程序，描述了如何使用voicemail content provider APIs添加一个新的voicemail records.
这个程序里包含一个
AddVoicemailActivity
,
它能够进入voicemail的详情，并录制voicemail音频。通过点击“Send”按钮，就可以通过voicemail content provider把他们保存起来。
现实世界中，一个类似的程序可以从远程voicemail服务器现在voicemail，并且通过voicemail content provider把它们保存在本地。平台会保管好voicemail的通知和渲染。
Following interfaces are of particular interest:
VoicemailProviderHelper
and its implementation in
VoicemailProviderHelpers
.
This interface provides a good demonstration of various fields exposed by voicemail
content provider and their usage.
Voicemail
and its implementation in
VoicemailImpl .
This interface provides a structured view of most the important fields in
voicemail content provider.