Excellent Android Open source project

Open Source project Summary:

Trinea/android-open-project GitHub

Includes personalization controls, tool libraries, excellent projects, development and testing tools, and more

Excellent complete project:

1.Google I/o Android App:

Google's annual Android sample APP is a must-see. Github repo: google/iosched GitHub
2.U2020:
A purely sample project, written by Jake Wharton, contains dependency injection, view injection, network picture asynchronous loading and caching, access to RESTful Services, logs, view-level debugging, and related Mock tests.
Includes the use of open source projects for Dagger, Butterknife, Picasso, retrofit, scalpel, timber, etc.
Github repo: jakewharton/u2020 GitHub

3.Philm:
Chris Banes's Open source project, the application content is the film introduction, also involves the dependency injection, Mvc,orm, the project level is very clear.
Github repo: chrisbanes/philm GitHub

As for more open source Android projects, go to https://android-arsenal.com/

Calendar:

Alamkanak/android-week-view GitHub

Excellent Android Open source project