weverb2

import com.google.android.material.tabs.TabLayout
import com.google.android.material.tabs.TabLayout.OnTabSelectedListener
import com.google.android.material.tabs.TabLayout.Tab

inline fun TabLayout.doOnTabReselected(
    crossinline action: (tab: Tab?) -> Unit
) = addOnTabSelectedListener(onTabReselected = action)

inline fun TabLayout.doOnTabUnselected(
    crossinline action: (tab: Tab?) -> Unit

weverb2

import android.os.Bundle
import android.util.Log
import android.util.Patterns
import androidx.appcompat.app.AppCompatActivity
import androidx.databinding.DataBindingUtil
import androidx.lifecycle.MediatorLiveData
import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.ViewModel
import androidx.lifecycle.ViewModelProviders
import works.wever.mvvm.R

weverb2

class MainViewModel : ViewModel() {
    val api = NetworkConfiguration.getPlaceholderApi()

    private val mutablePostData = MutableLiveData<List<Post>>()

    val postData: LiveData<List<Post>>
        get() = mutablePostData

    fun fetchPosts() {
        api.getPosts().enqueue(object : Callback<List<Post>> {

weverb2

@JsonClass(generateAdapter = true)
data class Post(
    @Json(name = "userId") val userId: Int,
    @Json(name = "id") val id: Int,
    @Json(name = "title") val title: String,
    @Json(name = "body") val body: String
)

weverb2

interface PlaceholderApi {
    @GET("/posts")
    fun getPosts(): Call<Response<List<Post>>>
}

weverb2

object NetworkConfiguration {

    const val BASE_URL = "https://jsonplaceholder.typicode.com/"

    val retrofit = Retrofit.Builder()
        .addConverterFactory(MoshiConverterFactory.create())
        .client(OkHttpClient())
        .baseUrl(BASE_URL)
        .build()

weverb2

class MainViewModelTest {

    @get:Rule
    val instantTaskRule = InstantTaskExecutorRule()

    @RelaxedMockK
    lateinit var mockObserver: Observer<Boolean>

    lateinit var viewModel: MainViewModel

weverb2

class MainActivity : AppCompatActivity() {

    lateinit var viewModel: MainViewModel

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        viewModel = ViewModelProviders.of(this).get(MainViewModel::class.java)

weverb2

class MainViewModel : ViewModel() {

    private val _isFormValid = MutableLiveData<Boolean>()

    val isFormValid: LiveData<Boolean>
        get() = _isFormValid

    var username = ""
        set(value) {
            field = value

weverb2

class MainActivity : AppCompatActivity() {

    lateinit var viewModel: MainViewModel

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        viewModel = ViewModelProviders.of(this).get(MainViewModel::class.java)