корутины и флоу

app/src/main/kotlin/ru/otus/coroutineshomework/ui/login/LoginFragment.kt

@@ -7,6 +7,10 @@ import android.view.ViewGroup
 import androidx.core.view.isVisible
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.viewModels
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.lifecycleScope
+import androidx.lifecycle.repeatOnLifecycle
+import kotlinx.coroutines.launch
 import ru.otus.coroutineshomework.databinding.ContentBinding
 import ru.otus.coroutineshomework.databinding.FragmentLoginBinding
 import ru.otus.coroutineshomework.databinding.LoadingBinding
@@ -43,12 +47,16 @@ class LoginFragment : Fragment() {
         setupLogin()
         setupContent()
 
-        loginViewModel.state.observe(viewLifecycleOwner) {
-            when(it) {
-                is LoginViewState.Login -> showLogin(it)
-                LoginViewState.LoggingIn -> showLoggingIn()
-                is LoginViewState.Content -> showContent(it)
-                LoginViewState.LoggingOut -> showLoggingOut()
+        viewLifecycleOwner.lifecycleScope.launch {
+            viewLifecycleOwner.lifecycle.repeatOnLifecycle(Lifecycle.State.STARTED) {
+                loginViewModel.state.collect { state ->
+                    when (state) {
+                        is LoginViewState.Login -> showLogin(state)
+                        LoginViewState.LoggingIn -> showLoggingIn()
+                        is LoginViewState.Content -> showContent(state)
+                        LoginViewState.LoggingOut -> showLoggingOut()
+                    }
+                }
             }
         }
     }

app/src/main/kotlin/ru/otus/coroutineshomework/ui/login/LoginViewModel.kt

@@ -3,25 +3,54 @@ package ru.otus.coroutineshomework.ui.login
 import androidx.lifecycle.LiveData
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import ru.otus.coroutineshomework.ui.login.data.Credentials
 
-class LoginViewModel : ViewModel() {
+class LoginViewModel(private val loginApi: LoginApi = LoginApi()) : ViewModel() {
 
-    private val _state = MutableLiveData<LoginViewState>(LoginViewState.Login())
-    val state: LiveData<LoginViewState> = _state
+    private val _state = MutableStateFlow<LoginViewState>(LoginViewState.Login())
+    val state: StateFlow<LoginViewState> = _state
 
     /**
      * Login to the network
      * @param name user name
      * @param password user password
      */
     fun login(name: String, password: String) {
-        // TODO: Implement login
+        viewModelScope.launch {
+            _state.emit(LoginViewState.LoggingIn)
+            try {
+                val user = withContext(Dispatchers.IO){
+                    loginApi.login(Credentials(name, password))
+                }
+                _state.emit(LoginViewState.Content(user))
+            }
+            catch (ex: Exception){
+                _state.emit(LoginViewState.Login(error = ex))
+            }
+        }
     }
 
     /**
      * Logout from the network
      */
     fun logout() {
-        // TODO: Implement logout
+        viewModelScope.launch {
+            _state.emit(LoginViewState.LoggingOut)
+            try {
+                withContext(Dispatchers.IO){
+                    loginApi.logout()
+                }
+                _state.emit(LoginViewState.Login())
+            }
+            catch (ex: Exception){
+                _state.emit(LoginViewState.Login(error = ex))
+            }
+        }
     }
 }

app/src/main/kotlin/ru/otus/coroutineshomework/ui/network/NetworkViewModel.kt

@@ -8,6 +8,10 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.isActive
 import kotlinx.coroutines.withContext
 import kotlin.random.Random
+import androidx.lifecycle.viewModelScope
+import kotlinx.coroutines.Deferred
+import kotlinx.coroutines.async
+import kotlinx.coroutines.launch
 
 class NetworkViewModel : ViewModel() {
 
@@ -18,7 +22,28 @@ class NetworkViewModel : ViewModel() {
     val result: LiveData<Long?> = _result
 
     fun startTest(numberOfThreads: Int) {
-        // TODO: Implement the logic
+        viewModelScope.launch {
+            _running.value = true
+
+            val ranJobs = mutableListOf<Deferred<Result<Long>>>()
+
+            repeat(numberOfThreads) {
+                val job = async {
+                    emulateBlockingNetworkRequest()
+                }
+                ranJobs.add(job)
+            }
+
+            val results = ranJobs.mapNotNull { it.await().getOrNull() }
+
+            if (results.isNotEmpty()) {
+                val averageTime = results.average().toLong()
+                _result.value = averageTime
+            } else {
+                _result.value = null
+            }
+            _running.value = false
+        }
     }
 
     private companion object {

app/src/main/kotlin/ru/otus/coroutineshomework/ui/timer/TimerFragment.kt

@@ -4,26 +4,34 @@ import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import androidx.collection.emptyLongSet
 import androidx.fragment.app.Fragment
+import androidx.lifecycle.coroutineScope
 import androidx.lifecycle.lifecycleScope
+import androidx.lifecycle.repeatOnLifecycle
 import kotlinx.coroutines.Job
+import kotlinx.coroutines.coroutineScope
 import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.isActive
 import kotlinx.coroutines.launch
 import ru.otus.coroutineshomework.databinding.FragmentTimerBinding
+import java.util.Calendar
 import java.util.Locale
 import kotlin.properties.Delegates
 import kotlin.time.Duration
+import kotlin.time.Duration.Companion.ZERO
 import kotlin.time.Duration.Companion.milliseconds
 
 class TimerFragment : Fragment() {
 
     private var _binding: FragmentTimerBinding? = null
     private val binding get() = _binding!!
 
-    private var time: Duration by Delegates.observable(Duration.ZERO) { _, _, newValue ->
-        binding.time.text = newValue.toDisplayString()
-    }
+    private var timerJob: Job? = null
+
+    private var timeFlow: MutableStateFlow<Duration> = MutableStateFlow(ZERO)
 
     private var started by Delegates.observable(false) { _, _, newValue ->
         setButtonsState(newValue)
@@ -53,12 +61,18 @@ class TimerFragment : Fragment() {
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
         savedInstanceState?.let {
-            time = it.getLong(TIME).milliseconds
+            timeFlow = MutableStateFlow(it.getLong(TIME).milliseconds)
             started = it.getBoolean(STARTED)
         }
         setButtonsState(started)
         with(binding) {
-            time.text = this@TimerFragment.time.toDisplayString()
+            viewLifecycleOwner.lifecycleScope.launch {
+                viewLifecycleOwner.lifecycle.repeatOnLifecycle(androidx.lifecycle.Lifecycle.State.STARTED) {
+                    timeFlow.collect { duration ->
+                        binding.time.text = duration.toDisplayString()
+                    }
+                }
+            }
             btnStart.setOnClickListener {
                 started = true
             }
@@ -70,16 +84,24 @@ class TimerFragment : Fragment() {
 
     override fun onSaveInstanceState(outState: Bundle) {
         super.onSaveInstanceState(outState)
-        outState.putLong(TIME, time.inWholeMilliseconds)
+        outState.putLong(TIME, timeFlow.value.inWholeMilliseconds)
         outState.putBoolean(STARTED, started)
     }
 
     private fun startTimer() {
-        // TODO: Start timer
+        stopTimer()
+        timerJob = lifecycle.coroutineScope.launch {
+            val prevTime = System.currentTimeMillis()
+            while(isActive){
+                val curTime = System.currentTimeMillis()
+                timeFlow.emit((curTime-prevTime).milliseconds)
+                delay(DELAY)
+            }
+        }
     }
 
     private fun stopTimer() {
-        // TODO: Stop timer
+        timerJob?.cancel()
     }
 
     override fun onDestroyView() {
@@ -91,6 +113,8 @@ class TimerFragment : Fragment() {
         private const val TIME = "time"
         private const val STARTED = "started"
 
+        private const val DELAY:Long = 50
+
         private fun Duration.toDisplayString(): String = String.format(
             Locale.getDefault(),
             "%02d:%02d.%03d",