(Source code introduction
In the SDK of Android 0.9 and earlier, there has always been a com google. Googlenav package can be used to realize many complex functions related to Google maps, such as the explicit path between two points I want to talk about today. However, since SDK 1.0, this package has been removed, which makes many early Android programs unable to compile and run, and the related functions cannot be realized. In addition to some more advanced APIs, this is understandable. Moreover, it provides a great intent mechanism for us to call the built-in Google maps.)
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