Feat: Migrate LiveData to Kotlin Flows

app/src/main/java/com/goldenraven/padawanwallet/data/chapters/ChapterDao.kt

@@ -7,14 +7,16 @@ package com.goldenraven.padawanwallet.data.chapters
 
 import androidx.lifecycle.LiveData
 import androidx.room.*
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.StateFlow
 
 @Dao
 interface ChapterDao {
     @Insert(onConflict = OnConflictStrategy.REPLACE)
     suspend fun addChapter(chapter: Chapter)
 
     @Query("SELECT * FROM chapters_db ORDER BY id ASC")
-    fun readAllChapters(): LiveData<List<Chapter>>
+    fun readAllChapters(): Flow<List<Chapter>>
 
     @Query("UPDATE chapters_db SET completed = :completed WHERE id = :id")
     suspend fun setCompleted(id: Int, completed: Boolean)

app/src/main/java/com/goldenraven/padawanwallet/data/chapters/ChapterRepository.kt

@@ -6,13 +6,15 @@
 package com.goldenraven.padawanwallet.data.chapters
 
 import android.util.Log
-import androidx.lifecycle.LiveData
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.runBlocking
 
 private const val TAG = "ChapterRepository"
 
 class ChapterRepository(private val chapterDao: ChapterDao) {
-    val readAllData: LiveData<List<Chapter>> = chapterDao.readAllChapters()
+
+    val readAllData: Flow<List<Chapter>> = chapterDao.readAllChapters()
 
     internal suspend fun getChapter(id: Int): Chapter {
         Log.i(TAG, "Querying for chapter $id")

app/src/main/java/com/goldenraven/padawanwallet/data/tx/TxDao.kt

@@ -5,17 +5,17 @@
 
 package com.goldenraven.padawanwallet.data.tx
 
-import androidx.lifecycle.LiveData
 import androidx.room.Dao
 import androidx.room.Insert
 import androidx.room.OnConflictStrategy
 import androidx.room.Query
+import kotlinx.coroutines.flow.Flow
 
 @Dao
 interface TxDao {
     @Insert(onConflict = OnConflictStrategy.REPLACE)
     fun addTx(tx: Tx)
 
     @Query("SELECT * FROM transaction_history ORDER BY date DESC")
-    fun readAllTx(): LiveData<List<Tx>>
+    fun readAllTx(): Flow<List<Tx>>
 }

app/src/main/java/com/goldenraven/padawanwallet/data/tx/TxRepository.kt

@@ -5,10 +5,10 @@
 
 package com.goldenraven.padawanwallet.data.tx
 
-import androidx.lifecycle.LiveData
+import kotlinx.coroutines.flow.Flow
 
 class TxRepository(private val txDao: TxDao) {
-    val readAllData: LiveData<List<Tx>> = txDao.readAllTx()
+    val readAllData: Flow<List<Tx>> = txDao.readAllTx()
 
     fun addTx(tx: Tx) {
         txDao.addTx(tx = tx)

app/src/main/java/com/goldenraven/padawanwallet/ui/chapters/ChaptersRootScreen.kt

@@ -8,7 +8,6 @@ import androidx.compose.foundation.layout.*
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material3.*
 import androidx.compose.runtime.*
-import androidx.compose.runtime.livedata.observeAsState
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.drawBehind
@@ -42,7 +41,7 @@ private const val TAG = "ChaptersRootScreen"
 
 @Composable
 internal fun ChaptersRootScreen(chaptersViewModel: ChaptersViewModel, navController: NavController) {
-    val selectedChapterData: Chapter? by chaptersViewModel.selectedChapterData.observeAsState()
+    val selectedChapterData: Chapter? by chaptersViewModel.selectedChapterData.collectAsState()
     val selectedChapterTagline = chaptersViewModel.getChapterPages(chaptersViewModel.selectedChapter.value)
     val defaultChapter = Chapter(0, "", "", "", false)
 

app/src/main/java/com/goldenraven/padawanwallet/ui/chapters/ChaptersViewModel.kt

@@ -10,22 +10,22 @@ import android.util.Log
 import androidx.compose.runtime.MutableState
 import androidx.compose.runtime.mutableStateOf
 import androidx.lifecycle.AndroidViewModel
-import androidx.lifecycle.LiveData
-import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.viewModelScope
 import com.goldenraven.padawanwallet.R
 import com.goldenraven.padawanwallet.data.chapters.*
 import kotlinx.coroutines.*
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
 
 private const val TAG = "ChaptersViewModel"
 
 class ChaptersViewModel(application: Application) : AndroidViewModel(application) {
     val selectedChapter: MutableState<Int> = mutableStateOf(1)
 
-    private val readAllData: LiveData<List<Chapter>>
+    private val readAllData: MutableStateFlow<List<Chapter>> = MutableStateFlow(emptyList())
     private val chapterRepository: ChapterRepository
 
-    val selectedChapterData: MutableLiveData<Chapter> = MutableLiveData<Chapter>(Chapter(id = 0, title = "", type = "", difficulty = "", completed = false))
+    val selectedChapterData: MutableStateFlow<Chapter> = MutableStateFlow<Chapter>(Chapter(id = 0, title = "", type = "", difficulty = "", completed = false))
 
     private val _chapterPageMap: Map<Int, List<List<ChapterElement>>>
 
@@ -53,7 +53,12 @@ class ChaptersViewModel(application: Application) : AndroidViewModel(application
             }
         }
         // this variable is null on first access, and hence triggers the reinitialization of the database content
-        readAllData = chapterRepository.readAllData
+        viewModelScope.launch {
+            chapterRepository.readAllData
+                .collect { result ->
+                    readAllData.value = result
+                }
+        }
         Log.i(TAG, "readAllData variable is ${readAllData.value}")
         updateSelectedChapter(1) // TODO Change to most recent chapter
         _chapterPageMap = initChapterPageMap()
@@ -95,7 +100,7 @@ class ChaptersViewModel(application: Application) : AndroidViewModel(application
             val chapter: Chapter = async {
                 chapterRepository.getChapter(id)
             }.await()
-            selectedChapterData.setValue(chapter)
+            selectedChapterData.value = chapter
         }
     }
 

app/src/main/java/com/goldenraven/padawanwallet/ui/wallet/ReceiveScreen.kt

@@ -12,12 +12,8 @@ import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.*
 import androidx.compose.ui.Modifier
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.livedata.observeAsState
-import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.remember
-import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.graphics.ImageBitmap
 import androidx.compose.ui.platform.LocalConfiguration
@@ -42,7 +38,7 @@ internal fun ReceiveScreen(
     navController: NavHostController,
     viewModel: WalletViewModel
 ) {
-    val address by viewModel.address.observeAsState("Generate new address")
+    val address by viewModel.address.collectAsState("Generate new address")
     var QR by remember {
         mutableStateOf<ImageBitmap?>(null)
     }

app/src/main/java/com/goldenraven/padawanwallet/ui/wallet/WalletRootScreen.kt

@@ -18,7 +18,6 @@ import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.material3.*
 import androidx.compose.runtime.*
-import androidx.compose.runtime.livedata.observeAsState
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.rotate
@@ -63,8 +62,8 @@ internal fun WalletRootScreen(
     walletViewModel: WalletViewModel
 ) {
     val balance by walletViewModel.balance.collectAsState()
-    val transactionList by walletViewModel.readAllData.observeAsState(initial = emptyList())
-    val isOnlineStatus by walletViewModel.isOnlineVariable.observeAsState()
+    val transactionList by walletViewModel.readAllData.collectAsState(initial = emptyList())
+    val isOnlineStatus by walletViewModel.isOnlineVariable.collectAsState()
     val tempOpenFaucetDialog = walletViewModel.openFaucetDialog
     val context = LocalContext.current
 

app/src/main/java/com/goldenraven/padawanwallet/ui/wallet/WalletViewModel.kt

@@ -15,8 +15,6 @@ import androidx.compose.material.SnackbarDuration
 import androidx.compose.material.SnackbarHostState
 import androidx.compose.runtime.*
 import androidx.lifecycle.AndroidViewModel
-import androidx.lifecycle.LiveData
-import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.viewModelScope
 import com.goldenraven.padawanwallet.BuildConfig
 import com.goldenraven.padawanwallet.data.*
@@ -48,16 +46,16 @@ private const val TAG = "WalletViewModel"
 class WalletViewModel(
     application: Application,
 ) : AndroidViewModel(application) {
-    val readAllData: LiveData<List<Tx>>
+    val readAllData: MutableStateFlow<List<Tx>> = MutableStateFlow<List<Tx>>(emptyList<Tx>())
     private val repository: TxRepository
     var openFaucetDialog: MutableState<Boolean> = mutableStateOf(false)
 
     private var _balance: MutableStateFlow<ULong> = MutableStateFlow(0u)
     val balance: StateFlow<ULong>
         get() = _balance
 
-    private var _address: MutableLiveData<String> = MutableLiveData("")
-    val address: LiveData<String>
+    private var _address: MutableStateFlow<String> = MutableStateFlow("No address yet")
+    val address: StateFlow<String>
         get() = _address
 
     var QRState: MutableStateFlow<QRUIState> = MutableStateFlow(QRUIState.NoQR)
@@ -66,14 +64,19 @@ class WalletViewModel(
     val isRefreshing: StateFlow<Boolean>
         get() = _isRefreshing.asStateFlow()
 
-    var isOnlineVariable: MutableLiveData<Boolean> = MutableLiveData(false)
+    var isOnlineVariable: MutableStateFlow<Boolean> = MutableStateFlow(false)
 
     init {
         Log.i(TAG, "The WalletScreen viewmodel is being initialized...")
 
         val txDao: TxDao = TxDatabase.getDatabase(application).txDao()
         repository = TxRepository(txDao)
-        readAllData = repository.readAllData
+        viewModelScope.launch {
+            repository.readAllData
+                .collect { result ->
+                    readAllData.value = result
+                }
+        }
 
         if (isOnlineVariable.value == true && !Wallet.blockchainIsInitialized()) {
             Wallet.createBlockchain()
@@ -116,7 +119,7 @@ class WalletViewModel(
 
     private fun getLastUnusedAddress(): AddressInfo {
         val address = Wallet.getLastUnusedAddress()
-        _address.setValue(address.address)
+        _address.value = address.address
         return address
     }
 
@@ -233,7 +236,7 @@ class WalletViewModel(
             false
         }
         Log.i(TAG, "Updating online status to $onlineStatus")
-        isOnlineVariable.setValue(onlineStatus)
+        isOnlineVariable.value = onlineStatus
     }
 
     fun broadcastTransaction(