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RoomDBActivity.kt
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RoomDBActivity.kt
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package me.amitshekhar.learn.kotlin.coroutines.ui.room
import android.os.Bundle
import android.view.View
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import androidx.lifecycle.ViewModelProvider
import androidx.recyclerview.widget.DividerItemDecoration
import androidx.recyclerview.widget.LinearLayoutManager
import kotlinx.android.synthetic.main.activity_recycler_view.*
import me.amitshekhar.learn.kotlin.coroutines.R
import me.amitshekhar.learn.kotlin.coroutines.data.api.ApiHelperImpl
import me.amitshekhar.learn.kotlin.coroutines.data.api.RetrofitBuilder
import me.amitshekhar.learn.kotlin.coroutines.data.local.DatabaseBuilder
import me.amitshekhar.learn.kotlin.coroutines.data.local.DatabaseHelperImpl
import me.amitshekhar.learn.kotlin.coroutines.data.local.entity.User
import me.amitshekhar.learn.kotlin.coroutines.ui.base.UserAdapter
import me.amitshekhar.learn.kotlin.coroutines.ui.base.UiState
import me.amitshekhar.learn.kotlin.coroutines.ui.base.ViewModelFactory
class RoomDBActivity : AppCompatActivity() {
private lateinit var viewModel: RoomDBViewModel
private lateinit var adapter: UserAdapter
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_recycler_view)
setupUI()
setupViewModel()
setupObserver()
}
private fun setupUI() {
recyclerView.layoutManager = LinearLayoutManager(this)
adapter =
UserAdapter(
arrayListOf()
)
recyclerView.addItemDecoration(
DividerItemDecoration(
recyclerView.context,
(recyclerView.layoutManager as LinearLayoutManager).orientation
)
)
recyclerView.adapter = adapter
}
private fun setupObserver() {
viewModel.getUiState().observe(this) {
when (it) {
is UiState.Success -> {
progressBar.visibility = View.GONE
renderList(it.data)
recyclerView.visibility = View.VISIBLE
}
is UiState.Loading -> {
progressBar.visibility = View.VISIBLE
recyclerView.visibility = View.GONE
}
is UiState.Error -> {
//Handle Error
progressBar.visibility = View.GONE
Toast.makeText(this, it.message, Toast.LENGTH_LONG).show()
}
}
}
}
private fun renderList(users: List<User>) {
adapter.addData(users)
adapter.notifyDataSetChanged()
}
private fun setupViewModel() {
viewModel = ViewModelProvider(
this,
ViewModelFactory(
ApiHelperImpl(RetrofitBuilder.apiService),
DatabaseHelperImpl(DatabaseBuilder.getInstance(applicationContext))
)
)[RoomDBViewModel::class.java]
}
}