worked on AddBatteryFragment.kt

app/src/main/java/com/sockenklaus/batterytracker/room/BatteryTrackerDB.kt

@@ -4,6 +4,7 @@ import android.content.Context
 import androidx.room.Database
 import androidx.room.Room
 import androidx.room.RoomDatabase
+import androidx.room.TypeConverters
 import com.sockenklaus.batterytracker.room.dao.BatteryDao
 import com.sockenklaus.batterytracker.room.dao.ChargeDao
 import com.sockenklaus.batterytracker.room.entities.Battery
@@ -13,9 +14,9 @@ import com.sockenklaus.batterytracker.room.entities.Charge
     entities = [Charge::class, Battery::class],
     version = 2
 )
+@TypeConverters(Converters::class)
 abstract class BatteryTrackerDB : RoomDatabase() {
     abstract fun batteryDao(): BatteryDao
-
     abstract fun chargeDao(): ChargeDao
 
     companion object {

app/src/main/java/com/sockenklaus/batterytracker/room/Converters.kt

@@ -0,0 +1,19 @@
+package com.sockenklaus.batterytracker.room
+
+import androidx.room.TypeConverter
+import java.time.Instant
+import java.time.LocalDateTime
+import java.time.ZoneId
+
+class Converters {
+
+    @TypeConverter
+    fun toLocalDateTime(value: Long): LocalDateTime {
+        return LocalDateTime.ofInstant(Instant.ofEpochMilli(value), ZoneId.systemDefault())
+    }
+
+    @TypeConverter
+    fun toEpochMilli(value: LocalDateTime): Long {
+        return value.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli()
+    }
+}

app/src/main/java/com/sockenklaus/batterytracker/ui/fragments/add_battery/AddBatteryFragment.kt

@@ -10,12 +10,11 @@ import androidx.compose.foundation.text.KeyboardOptions
 import androidx.compose.material.*
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.*
-import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.remember
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.setValue
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.TextStyle
 import androidx.compose.ui.text.input.KeyboardType
 import androidx.compose.ui.unit.dp
 import androidx.constraintlayout.compose.ConstraintLayout
@@ -53,56 +52,39 @@ class AddBatteryFragment : Fragment() {
                 var batteryId by remember { mutableStateOf("") }
                 var declaredCapacity by remember { mutableStateOf("")}
 
-                ConstraintLayout {
-                    val (textBatteryId, textDeclaredCapacity, fab ) = createRefs()
-                    val outerMargin = 24.dp
-                    val innerMargin = 16.dp
+                val outerPadding = 24.dp
+                val innerPadding = 16.dp
 
-                    OutlinedTextField(
+                Column(
+                    Modifier.padding(outerPadding)
+                ) {
+                    MyOutlinedTextField(
                         value = batteryId,
                         onValueChange = { batteryId = it },
-                        keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Text),
-                        label = { Text(stringResource(R.string.hint_enter_battery_id)) },
-                        leadingIcon = { Icon(Icons.Default.Tag, null) },
-                        modifier = Modifier
-                            .constrainAs(textBatteryId) {
-                                top.linkTo(parent.top, margin = outerMargin)
-                                start.linkTo(parent.start, margin = outerMargin)
-                                end.linkTo(parent.end, margin = outerMargin)
-                                width = Dimension.fillToConstraints
-                            }
-                            .wrapContentHeight()
+                        labelId = R.string.hint_enter_battery_id,
+                        leadingIcon = { Icon(Icons.Default.Tag, "Icon Tag") }
                     )
 
-                    OutlinedTextField(
+                    Spacer(Modifier.size(innerPadding))
+
+                    MyOutlinedTextField(
                         value = declaredCapacity,
                         onValueChange = { declaredCapacity = validateDecimal(it, declaredCapacity) },
+                        labelId = R.string.hint_enter_declared_capacity,
                         keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Decimal),
-                        label = { Text(stringResource(R.string.hint_enter_declared_capacity)) },
-                        leadingIcon = { Icon(Icons.Default.BatteryFull, null) },
-                        modifier = Modifier
-                            .constrainAs(textDeclaredCapacity) {
-                                top.linkTo(textBatteryId.bottom, margin = innerMargin)
-                                start.linkTo(parent.start, margin = outerMargin)
-                                end.linkTo(parent.end, margin = outerMargin)
-                                width = Dimension.fillToConstraints
-                            }
+                        leadingIcon = { Icon(Icons.Default.BatteryFull, "Icon Battery Full") }
                     )
 
+                    Spacer(Modifier.size(outerPadding))
+
                     ExtendedFloatingActionButton(
                         onClick = { saveBattery(
                             batteryId, declaredCapacity
                         ) },
                         icon = { Icon(Icons.Default.Save, null) },
                         text = { Text(stringResource(R.string.button_save_battery)) },
-                        modifier = Modifier
-                            .constrainAs(fab) {
-                                top.linkTo(textDeclaredCapacity.bottom, margin = 24.dp)
-                                end.linkTo(parent.end, margin = outerMargin)
-                            }
+                        modifier = Modifier.align(Alignment.End)
                     )
-
-
                 }
             }
         }
@@ -111,6 +93,31 @@ class AddBatteryFragment : Fragment() {
         return view
     }
 
+    @Composable
+    fun MyOutlinedTextField(
+        value: String,
+        onValueChange: (String) -> Unit,
+        keyboardOptions: KeyboardOptions = KeyboardOptions.Default,
+        labelId: Int,
+        leadingIcon: (@Composable () -> Unit)? = null,
+        isError: Boolean = false,
+        helperText: String = ""
+    ) {
+        OutlinedTextField(
+            value = value,
+            onValueChange = onValueChange,
+            keyboardOptions = keyboardOptions,
+            label = { Text(stringResource(labelId)) },
+            leadingIcon = leadingIcon,
+            modifier = Modifier.fillMaxWidth()
+        )
+        Text(
+            text = helperText,
+            style = MaterialTheme.typography.caption,
+            modifier = Modifier.padding(start = 16.dp)
+        )
+    }
+
     /*
     TODO: Implement the action
      */

app/src/main/java/com/sockenklaus/batterytracker/ui/fragments/add_charge/AddChargeFragment.kt

@@ -148,6 +148,7 @@ class AddChargeFragment : Fragment() {
         onSelect: (LocalDateTime) -> Unit,
     ) {
         val dateFormat: DateTimeFormatter = DateTimeFormatter.ofLocalizedDate(FormatStyle.LONG).withLocale(Locale.GERMANY)
+
         val datePicker = MaterialDatePicker.Builder.datePicker()
             .setTitleText("Select date")
             .setSelection( date.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli() )