Support older Android API versions (#96)

* Add binary icon versions for old android versions and use Java 7 date APIs

* Stop using some more modern Java constructs

app/build.gradle.kts

@@ -12,7 +12,7 @@ android {
 
     defaultConfig {
         applicationId = "be.chvp.nanoledger"
-        minSdk = 26
+        minSdk = 21
         targetSdk = 34
         versionCode = 10700
         versionName = "0.1.6"
@@ -47,9 +47,10 @@ android {
         quiet = true
         disable.addAll(
             arrayOf(
-                "NewerVersionAvailable",
                 "GradleDependency",
+                "NewerVersionAvailable",
                 "ObsoleteLintCustomCheck",
+                "SimpleDateFormat",
             ),
         )
         checkAllWarnings = true

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

@@ -70,7 +70,13 @@ class LedgerRepository
                 fileUri
                     ?.let { context.contentResolver.openInputStream(it) }
                     ?.let { BufferedReader(InputStreamReader(it)) }
-                    ?.use { it.lines().forEach { result.add(it) } }
+                    ?.use { reader ->
+                        var line = reader.readLine()
+                        while (line != null) {
+                            result.add(line)
+                            line = reader.readLine()
+                        }
+                    }
                 val extracted = extractTransactions(result)
                 _fileContents.postValue(result)
                 _transactions.postValue(extracted)

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

@@ -74,8 +74,6 @@ import be.chvp.nanoledger.ui.theme.NanoLedgerTheme
 import dagger.hilt.android.AndroidEntryPoint
 import kotlinx.coroutines.Dispatchers.Main
 import kotlinx.coroutines.launch
-import java.time.ZoneOffset
-import java.time.format.DateTimeFormatter
 
 @AndroidEntryPoint
 class AddActivity() : ComponentActivity() {
@@ -283,9 +281,10 @@ fun DateSelector(
 ) {
     val focusManager = LocalFocusManager.current
     val date by addViewModel.date.observeAsState()
+    val formattedDate by addViewModel.formattedDate.observeAsState()
     var dateDialogOpen by rememberSaveable { mutableStateOf(false) }
     OutlinedTextField(
-        value = date?.format(DateTimeFormatter.ISO_DATE) ?: "",
+        value = formattedDate ?: "",
         readOnly = true,
         singleLine = true,
         onValueChange = {},
@@ -303,14 +302,7 @@ fun DateSelector(
             },
     )
     if (dateDialogOpen) {
-        val datePickerState =
-            rememberDatePickerState(
-                initialSelectedDateMillis =
-                    date
-                        ?.atStartOfDay()
-                        ?.toInstant(ZoneOffset.UTC)
-                        ?.toEpochMilli(),
-            )
+        val datePickerState = rememberDatePickerState(initialSelectedDateMillis = date?.getTime())
         DatePickerDialog(
             onDismissRequest = { dateDialogOpen = false },
             confirmButton = {

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

@@ -15,10 +15,8 @@ import kotlinx.coroutines.Dispatchers.IO
 import kotlinx.coroutines.launch
 import java.io.IOException
 import java.math.BigDecimal
-import java.time.Instant
-import java.time.LocalDate
-import java.time.ZoneId
-import java.time.format.DateTimeFormatter
+import java.text.SimpleDateFormat
+import java.util.Date
 import javax.inject.Inject
 
 @HiltViewModel
@@ -32,8 +30,9 @@ class AddViewModel
         private val _saving = MutableLiveData<Boolean>(false)
         val saving: LiveData<Boolean> = _saving
 
-        private val _date = MutableLiveData<LocalDate>(LocalDate.now())
-        val date: LiveData<LocalDate> = _date
+        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 _status = MutableLiveData<String>(preferencesDataSource.getDefaultStatus())
         val status: LiveData<String> = _status
@@ -114,7 +113,7 @@ class AddViewModel
                 _saving.value = true
                 viewModelScope.launch(IO) {
                     val transaction = StringBuilder()
-                    transaction.append(date.value!!.format(DateTimeFormatter.ISO_DATE))
+                    transaction.append(SimpleDateFormat("yyyy-MM-dd").format(date.value!!))
                     if (status.value!! != " ") {
                         transaction.append(" ${status.value}")
                     }
@@ -166,7 +165,7 @@ class AddViewModel
         }
 
         fun setDate(dateMillis: Long) {
-            _date.value = Instant.ofEpochMilli(dateMillis).atZone(ZoneId.of("UTC")).toLocalDate()
+            _date.value = Date(dateMillis)
         }
 
         fun setStatus(newStatus: String) {
@@ -187,9 +186,14 @@ class AddViewModel
         ) {
             val result = ArrayList(postings.value!!)
             result[index] = Triple(newAccount, result[index].second, result[index].third)
-            result.removeIf { it.first == "" && it.third == "" }
-            result.add(emptyPosting())
-            _postings.value = result
+            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
         }
 
         fun setCurrency(
@@ -207,9 +211,14 @@ class AddViewModel
         ) {
             val result = ArrayList(postings.value!!)
             result[index] = Triple(result[index].first, result[index].second, newAmount)
-            result.removeIf { it.first == "" && it.third == "" }
-            result.add(emptyPosting())
-            _postings.value = result
+            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
         }
 
         fun emptyPosting(): Triple<String, String, String> {