Reapply "Use Android desugaring to use more modern Java constructs"

app/build.gradle.kts

@@ -33,6 +33,7 @@ android {
         }
     }
     compileOptions {
+        isCoreLibraryDesugaringEnabled = true
         sourceCompatibility = JavaVersion.VERSION_17
         targetCompatibility = JavaVersion.VERSION_17
     }
@@ -83,6 +84,7 @@ configure<org.jlleitschuh.gradle.ktlint.KtlintExtension> {
 }
 
 dependencies {
+    coreLibraryDesugaring(libs.android.desugar)
     implementation(libs.activity.compose)
     implementation(libs.activity.ktx)
     implementation(platform(libs.compose.bom))

app/src/main/java/be/chvp/nanoledger/data/LedgerRepository.kt

@@ -51,13 +51,7 @@ class LedgerRepository
                 fileUri
                     .let { context.contentResolver.openInputStream(it) }
                     ?.let { BufferedReader(InputStreamReader(it)) }
-                    ?.use { reader ->
-                        var line = reader.readLine()
-                        while (line != null) {
-                            result.add(line)
-                            line = reader.readLine()
-                        }
-                    }
+                    ?.use { it.lines().forEach { result.add(it) } }
 
                 if (!result.equals(fileContents.value)) {
                     onMismatch()
@@ -116,13 +110,7 @@ class LedgerRepository
                 fileUri
                     .let { context.contentResolver.openInputStream(it) }
                     ?.let { BufferedReader(InputStreamReader(it)) }
-                    ?.use { reader ->
-                        var line = reader.readLine()
-                        while (line != null) {
-                            result.add(line)
-                            line = reader.readLine()
-                        }
-                    }
+                    ?.use { it.lines().forEach { result.add(it) } }
                 val extracted = extractTransactions(result)
                 _fileContents.postValue(result)
                 _transactions.postValue(extracted)

app/src/main/java/be/chvp/nanoledger/ui/add/AddActivity.kt

@@ -280,8 +280,8 @@ fun DateSelector(
     addViewModel: AddViewModel = viewModel(),
 ) {
     val focusManager = LocalFocusManager.current
-    val date by addViewModel.date.observeAsState()
     val formattedDate by addViewModel.formattedDate.observeAsState()
+    val dateMillis by addViewModel.dateMillis.observeAsState()
     var dateDialogOpen by rememberSaveable { mutableStateOf(false) }
     OutlinedTextField(
         value = formattedDate ?: "",
@@ -302,7 +302,7 @@ fun DateSelector(
             },
     )
     if (dateDialogOpen) {
-        val datePickerState = rememberDatePickerState(initialSelectedDateMillis = date?.getTime())
+        val datePickerState = rememberDatePickerState(initialSelectedDateMillis = dateMillis)
         DatePickerDialog(
             onDismissRequest = { dateDialogOpen = false },
             confirmButton = {

app/src/main/java/be/chvp/nanoledger/ui/add/AddViewModel.kt

@@ -15,8 +15,11 @@ import kotlinx.coroutines.Dispatchers.IO
 import kotlinx.coroutines.launch
 import java.io.IOException
 import java.math.BigDecimal
-import java.text.SimpleDateFormat
-import java.util.Date
+import java.time.Instant
+import java.time.LocalDate
+import java.time.ZoneId
+import java.time.ZoneOffset
+import java.time.format.DateTimeFormatter
 import javax.inject.Inject
 
 @HiltViewModel
@@ -30,9 +33,10 @@ class AddViewModel
         private val _saving = MutableLiveData<Boolean>(false)
         val saving: LiveData<Boolean> = _saving
 
-        private val _date = MutableLiveData<Date>(Date())
-        val date: LiveData<Date> = _date
-        val formattedDate: LiveData<String> = _date.map { SimpleDateFormat("yyyy-MM-dd").format(it) }
+        private val _date = MutableLiveData<LocalDate>(LocalDate.now())
+        val date: LiveData<LocalDate> = _date
+        val formattedDate: LiveData<String> = _date.map { it.format(DateTimeFormatter.ISO_DATE) }
+        val dateMillis: LiveData<Long> = _date.map { it.atStartOfDay().toInstant(ZoneOffset.UTC).toEpochMilli() }
 
         private val _status = MutableLiveData<String>(preferencesDataSource.getDefaultStatus())
         val status: LiveData<String> = _status
@@ -113,7 +117,7 @@ class AddViewModel
                 _saving.value = true
                 viewModelScope.launch(IO) {
                     val transaction = StringBuilder()
-                    transaction.append(SimpleDateFormat("yyyy-MM-dd").format(date.value!!))
+                    transaction.append(_date.value!!.format(DateTimeFormatter.ISO_DATE))
                     if (status.value!! != " ") {
                         transaction.append(" ${status.value}")
                     }
@@ -165,7 +169,7 @@ class AddViewModel
         }
 
         fun setDate(dateMillis: Long) {
-            _date.value = Date(dateMillis)
+            _date.value = Instant.ofEpochMilli(dateMillis).atZone(ZoneId.of("UTC")).toLocalDate()
         }
 
         fun setStatus(newStatus: String) {
@@ -186,14 +190,7 @@ class AddViewModel
         ) {
             val result = ArrayList(postings.value!!)
             result[index] = Triple(newAccount, result[index].second, result[index].third)
-            val filteredResult = ArrayList<Triple<String, String, String>>()
-            for (triple in result) {
-                if (triple.first != "" || triple.third != "") {
-                    filteredResult.add(triple)
-                }
-            }
-            filteredResult.add(emptyPosting())
-            _postings.value = filteredResult
+            _postings.value = removeEmpty(result)
         }
 
         fun setCurrency(
@@ -211,14 +208,18 @@ class AddViewModel
         ) {
             val result = ArrayList(postings.value!!)
             result[index] = Triple(result[index].first, result[index].second, newAmount)
-            val filteredResult = ArrayList<Triple<String, String, String>>()
-            for (triple in result) {
-                if (triple.first != "" || triple.third != "") {
-                    filteredResult.add(triple)
+            _postings.value = removeEmpty(result)
+        }
+
+        fun removeEmpty(postings: List<Triple<String, String, String>>): List<Triple<String, String, String>> {
+            val result = ArrayList<Triple<String, String, String>>()
+            for (p in postings) {
+                if (p.first != "" || p.third != "") {
+                    result.add(p)
                 }
             }
-            filteredResult.add(emptyPosting())
-            _postings.value = filteredResult
+            result.add(emptyPosting())
+            return result
         }
 
         fun emptyPosting(): Triple<String, String, String> {

gradle/libs.versions.toml

@@ -1,5 +1,6 @@
 [versions]
 agp = "8.5.0"
+desugar = "2.0.4"
 kotlin = "1.9.24"
 ksp = "1.9.24-1.0.20"
 hilt = "2.51.1"
@@ -16,6 +17,7 @@ material = "1.12.0"
 [libraries]
 activity-compose = { group = "androidx.activity", name = "activity-compose", version.ref = "activity" }
 activity-ktx = { group = "androidx.activity", name = "activity-ktx", version.ref = "activity" }
+android-desugar = { group = "com.android.tools", name = "desugar_jdk_libs", version.ref = "desugar" }
 androidx-test-ext-junit = { group = "androidx.test.ext", name = "junit", version.ref = "androidx-test-ext-junit" }
 compose-bom = { group = "androidx.compose", name = "compose-bom", version.ref = "compose-bom" }
 compose-material-icons-extended = { group = "androidx.compose.material", name = "material-icons-extended" }