Simple Image Gallery Communicating with a webservice (rest api) using Retrofit2 MVVM Architecture: ViewModel, Repository, Client structure Custom Loading Animation ProgressBar in Recyclerview RecyclerView Customizing Toolbar Behaviors with CoordinatorLayout and AppBarLayout Observables, LiveData, MutableLiveData and MediatorLiveData Displaying Images using Glide CardViews SearchViews Passing data between activities using intent extras Executors and Background Threads ThreadPools Network Security Config for HTTP (API 28+) I publish it for learning purpose you can check it out: https://play.google.com/store/apps/details?id=com.davinci.simpleimagegalleryapp
