tree 4009a953ff62d74e39e441d2695a5968be09ee1c
parent d55903b108d2076a5aeafc6e17bdb17fc5dd476b
author YoungSeok Yoon <youngseokyoon@google.com> 1449005700 -0800
committer Ross Wang <rosswang@google.com> 1449005839 +0000

reader/android: Google Analytics integration for collecting user events

This CL integrates Google Analytics to the project. In order to enable
the GA feature, google-services.json file should be downloaded and put
under android/app directory (instructions: http://goo.gl/8Rd3yj)

The ReaderApplication has two implementations, and only one of them is
conditionally added to the project source sets to avoid breaking build
when the "google-services.json" file does not exist.

The activities are refactored to have a common base class. The base
class performs several initializations needed by all activities used
in the Reader app.

The following events are sent to the Google Analytics server.
 - all the gesture events detected by the GestureDetectors
 - prev/next page button
 - link/unlink page button

Change-Id: I1ad5fab10ee92e3f877028a3ab944250e68b76f2