x/mobile: net.DialUDP doesn't work on Android

[ghost]

For example, I have:

Conn, _ := net.DialUDP("udp", LocalAddr, ServerAddr)

Then any action on Conn will crash the app, e.g. Conn.Close()

I tested this on Samsung Galaxy S3 with Android 4.1.1 and Note 5 with Android 5.1.1. Only native Go is used.

[bradfitz]

You're ignoring the error value. Look at the error to see the reason.

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