Dagger2

The following 3 articles introduce how to use Dagger2 in a real Android App Project.

In part1, to attach activities/fragments to dagger graph, it create a lot boilerplate classes and needs a lot repetitive tasks, so is too complicated, so just walk through part1.

In part2, use @ContributesAndroidInjector to simplify dagger graph, check this commit for details

New Android Injector with Dagger 2 — part 1, part 2, part 3

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