Not do networking and IO operation on main thread
Not do networking and IO operation on main thread

On Android 7.0 application is under strict mode by default which is a
development tool to forbid networking and IO operation on main thread.
Otherwise a NetworkOnMainThreadException will be thrown.

Signed-off-by: Leo Ma <a53a317c6ef26cd024d51182ec568f98d2cd3f6e@gmail.com>

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