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InstaMaterial
Implementation of Instagram with Material Design (originally based on Emmanuel Pacamalan's concept)
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Google has created like 7 different ways to build the same thing out of which 6+-1 are deprecated, either code-wise or due to obsolescence (and things that just should be deprecated instead of pushed ahead forcefully) so now what a Junior needs to know is solid Android fundamentals (Activity, Fragment, UI basics, RecyclerView, FrameLayout, LinearLayout, ConstraintLayout, etc), networking fundamentals and Retrofit, relational DB fundamentals, threading fundamentals, Java/Kotlin fundamentals, UI fundamentals, localization / string resources and drawables on Android, merge layouts and styleables, styles, Fragments, RecyclerView, am I repeating myself
I did write https://github.com/Zhuinden/guide-to-kotlin for Kotlin specifically, but it's Android-agnostic