AboutScreen: new button to send the last captured image (#88)

app/src/main/java/org/fairscan/app/FairScanApp.kt

@@ -70,7 +70,6 @@ class AppContainer(context: Context) {
 
     val homeViewModelFactory = viewModelFactory { HomeViewModel(it, context) }
     val cameraViewModelFactory = viewModelFactory { CameraViewModel(it) }
-    val aboutViewModelFactory = viewModelFactory { AboutViewModel(it) }
     val settingsViewModelFactory = viewModelFactory { SettingsViewModel(it) }
 
     fun cleanOrphanSessions() {

app/src/main/java/org/fairscan/app/MainActivity.kt

@@ -50,6 +50,7 @@ import androidx.lifecycle.lifecycleScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 import org.fairscan.app.data.FileLogger
+import org.fairscan.app.data.ImageRepository
 import org.fairscan.app.ui.Navigation
 import org.fairscan.app.ui.Screen
 import org.fairscan.app.ui.components.rememberCameraPermissionState
@@ -58,6 +59,7 @@ import org.fairscan.app.ui.screens.LibrariesScreen
 import org.fairscan.app.ui.screens.about.AboutEvent
 import org.fairscan.app.ui.screens.about.AboutScreen
 import org.fairscan.app.ui.screens.about.AboutViewModel
+import org.fairscan.app.ui.screens.about.createEmailWithImageIntent
 import org.fairscan.app.ui.screens.camera.CameraEvent
 import org.fairscan.app.ui.screens.camera.CameraScreen
 import org.fairscan.app.ui.screens.camera.CameraViewModel
@@ -101,9 +103,14 @@ class MainActivity : ComponentActivity() {
                 ExportViewModel(appContainer, sessionContainer.imageRepository)
             }
         }
+        val aboutViewModel: AboutViewModel by viewModels {
+            appContainer.viewModelFactory {
+                AboutViewModel(appContainer, sessionContainer.imageRepository)
+            }
+        }
         val homeViewModel: HomeViewModel by viewModels { appContainer.homeViewModelFactory }
         val cameraViewModel: CameraViewModel by viewModels { appContainer.cameraViewModelFactory }
-        val aboutViewModel: AboutViewModel by viewModels { appContainer.aboutViewModelFactory }
+
         val settingsViewModel: SettingsViewModel
             by viewModels { appContainer.settingsViewModelFactory }
         lifecycleScope.launch(Dispatchers.IO) {
@@ -119,7 +126,7 @@ class MainActivity : ComponentActivity() {
             val cameraPermission = rememberCameraPermissionState()
             CollectCameraEvents(cameraViewModel, viewModel)
             CollectExportEvents(context, exportViewModel)
-            CollectAboutEvents(context, aboutViewModel)
+            CollectAboutEvents(context, aboutViewModel, sessionContainer.imageRepository)
 
             FairScanTheme {
                 val navigation = navigation(viewModel, launchMode)
@@ -187,9 +194,16 @@ class MainActivity : ComponentActivity() {
                         )
                     }
                     is Screen.Overlay.About -> {
+                        LaunchedEffect(Unit) {
+                            aboutViewModel.refreshLastCapturedImageState()
+                        }
+                        val aboutUiState by aboutViewModel.uiState.collectAsStateWithLifecycle()
                         AboutScreen(
+                            aboutUiState = aboutUiState,
                             onBack = navigation.back,
                             onCopyLogs = { aboutViewModel.onCopyLogsClicked() },
+                            onContactWithLastImageClicked =
+                                { aboutViewModel.onContactWithLastImageClicked() },
                             onViewLibraries = navigation.toLibrariesScreen)
                     }
                     is Screen.Overlay.Libraries -> {
@@ -262,6 +276,7 @@ class MainActivity : ComponentActivity() {
     private fun CollectAboutEvents(
         context: Context,
         aboutViewModel: AboutViewModel,
+        imageRepository: ImageRepository,
     ) {
         val clipboard = LocalClipboard.current
         val msgCopiedLogs = stringResource(R.string.copied_logs)
@@ -274,6 +289,12 @@ class MainActivity : ComponentActivity() {
                         )
                         Toast.makeText(context, msgCopiedLogs, Toast.LENGTH_SHORT).show()
                     }
+                    is AboutEvent.PrepareEmailWithLastImage -> {
+                        val file = imageRepository.lastAddedSourceFile()
+                        if (file != null) {
+                            startActivity(createEmailWithImageIntent(context, file))
+                        }
+                    }
                 }
             }
         }
@@ -370,8 +391,7 @@ class MainActivity : ComponentActivity() {
     }
 
     private fun uriForFile(file: File): Uri {
-        val authority = "${applicationContext.packageName}.fileprovider"
+        return org.fairscan.app.ui.uriForFile(this, file)
-        return FileProvider.getUriForFile(this, authority, file)
     }
 
     private fun checkPermissionThen(

app/src/main/java/org/fairscan/app/data/ImageRepository.kt

@@ -298,6 +298,14 @@ class ImageRepository(
             }
         }
     }
+
+    fun lastAddedSourceFile(): File? {
+        val sourceFiles = sourceDir.listFiles()?.filter { it.extension == "jpg" }
+        if (sourceFiles.isNullOrEmpty()) {
+            return null
+        }
+        return sourceFiles.maxByOrNull { it.lastModified() }
+    }
 }
 
 fun Quad.toSerializable(): NormalizedQuad =

app/src/main/java/org/fairscan/app/ui/FileUris.kt

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2025 Pierre-Yves Nicolas
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, either version 3 of the License, or (at your option)
+ * any later version.
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+package org.fairscan.app.ui
+
+import android.content.Context
+import android.net.Uri
+import androidx.core.content.FileProvider
+import java.io.File
+
+fun uriForFile(context: Context, file: File): Uri {
+    val authority = "${context.packageName}.fileprovider"
+    return FileProvider.getUriForFile(context, authority, file)
+}

app/src/main/java/org/fairscan/app/ui/screens/about/AboutScreen.kt

@@ -57,6 +57,7 @@ import androidx.compose.runtime.remember
 import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.alpha
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.platform.LocalContext
@@ -76,8 +77,10 @@ import org.fairscan.app.ui.theme.FairScanTheme
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun AboutScreen(
+    aboutUiState: AboutUiState,
     onBack: () -> Unit,
     onCopyLogs: () -> Unit,
+    onContactWithLastImageClicked: () -> Unit,
     onViewLibraries: () -> Unit,
 ) {
     val showLicenseDialog = rememberSaveable { mutableStateOf(false) }
@@ -93,7 +96,9 @@ fun AboutScreen(
     ) { paddingValues ->
         AboutContent(
             modifier = Modifier.padding(paddingValues),
+            aboutUiState,
             onCopyLogs,
+            onContactWithLastImageClicked,
             showLicenseDialog,
             onViewLibraries)
     }
@@ -105,7 +110,9 @@ fun AboutScreen(
 @Composable
 fun AboutContent(
     modifier: Modifier = Modifier,
+    aboutUiState: AboutUiState,
     onCopyLogs: () -> Unit,
+    onContactWithLastImageClicked: () -> Unit,
     showLicenseDialog: MutableState<Boolean>,
     onViewLibraries: () -> Unit,
     ) {
@@ -145,16 +152,10 @@ fun AboutContent(
         }
 
         Section(title = stringResource(R.string.contact)) {
-            val emailAddress = "contact@fairscan.org"
             ContactLink(
                 icon = Icons.Default.Email,
-                text = emailAddress,
+                text = EMAIL_ADDRESS,
-                onClick = {
+                onClick = { context.startActivity(createContactEmailIntent()) }
-                    val intent = Intent(Intent.ACTION_SENDTO).apply {
-                        data = "mailto:$emailAddress".toUri()
-                    }
-                    context.startActivity(intent)
-                }
             )
             val websiteUrl = "https://fairscan.org"
             ContactLink(
@@ -165,6 +166,10 @@ fun AboutContent(
                     context.startActivity(intent)
                 }
             )
+        }
+
+        Section(title = stringResource(R.string.support)) {
+            EmailImageButton(aboutUiState, onContactWithLastImageClicked)
             CopyLogsButton (onClick = onCopyLogs)
         }
 
@@ -295,11 +300,33 @@ fun CopyLogsButton(onClick: () -> Unit) {
     }
 }
 
+@Composable
+fun EmailImageButton(
+    aboutUiState: AboutUiState,
+    onContactWithLastImageClicked: () -> Unit,
+) {
+    Row(
+        modifier = Modifier
+            .fillMaxWidth()
+            .clickable(
+                enabled = aboutUiState.hasLastCapturedImage,
+                onClick = onContactWithLastImageClicked
+            )
+            .alpha(if (aboutUiState.hasLastCapturedImage) 1f else 0.5f)
+            .padding(vertical = 8.dp),
+        verticalAlignment = Alignment.CenterVertically
+    ) {
+        Icon(Icons.Default.Email, contentDescription = null)
+        Spacer(Modifier.width(16.dp))
+        Text(stringResource(R.string.support_last_image))
+    }
+}
 
 @Preview
 @Composable
 fun AboutScreenPreview() {
     FairScanTheme {
-        AboutScreen(onBack = {}, onCopyLogs = {}, onViewLibraries = {})
+        val state = AboutUiState(true)
+        AboutScreen(state, {}, {}, {}, {})
     }
 }

app/src/main/java/org/fairscan/app/ui/screens/about/AboutUiState.kt

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2025 Pierre-Yves Nicolas
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, either version 3 of the License, or (at your option)
+ * any later version.
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+package org.fairscan.app.ui.screens.about
+
+import androidx.compose.runtime.Immutable
+
+@Immutable
+data class AboutUiState(
+    val hasLastCapturedImage: Boolean = false,
+)

app/src/main/java/org/fairscan/app/ui/screens/about/AboutViewModel.kt

@@ -18,23 +18,31 @@ import android.os.Build
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.asSharedFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
 import org.fairscan.app.AppContainer
 import org.fairscan.app.BuildConfig
+import org.fairscan.app.data.ImageRepository
 import java.time.LocalDateTime
 
 sealed interface AboutEvent {
     data class CopyLogs(val logs: String) : AboutEvent
+    object PrepareEmailWithLastImage : AboutEvent
 }
 
-class AboutViewModel(container: AppContainer): ViewModel() {
+class AboutViewModel(container: AppContainer, val imageRepository: ImageRepository): ViewModel() {
 
     private val logRepository = container.logRepository
 
     private val _events = MutableSharedFlow<AboutEvent>()
     val events = _events.asSharedFlow()
 
+    private val _uiState = MutableStateFlow(AboutUiState())
+    val uiState = _uiState.asStateFlow()
+
     fun onCopyLogsClicked() {
         viewModelScope.launch {
             val logs = buildFullLogs()
@@ -55,4 +63,15 @@ class AboutViewModel(container: AppContainer): ViewModel() {
         return header + logRepository.getLogs()
     }
 
+    fun refreshLastCapturedImageState() {
+        _uiState.update {
+            it.copy(hasLastCapturedImage = imageRepository.lastAddedSourceFile() != null)
+        }
+    }
+
+    fun onContactWithLastImageClicked() {
+        viewModelScope.launch {
+            _events.emit(AboutEvent.PrepareEmailWithLastImage)
+        }
+    }
 }

app/src/main/java/org/fairscan/app/ui/screens/about/Emails.kt

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2025 Pierre-Yves Nicolas
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, either version 3 of the License, or (at your option)
+ * any later version.
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+package org.fairscan.app.ui.screens.about
+
+import android.content.Context
+import android.content.Intent
+import androidx.core.net.toUri
+import org.fairscan.app.BuildConfig
+import org.fairscan.app.ui.uriForFile
+import java.io.File
+
+const val EMAIL_ADDRESS = "contact@fairscan.org"
+
+fun createContactEmailIntent(): Intent =
+    Intent(Intent.ACTION_SENDTO).apply {
+        data = "mailto:$EMAIL_ADDRESS".toUri()
+    }
+
+fun createEmailWithImageIntent(context: Context, imageFile: File?): Intent {
+    val intent = Intent(Intent.ACTION_SEND).apply {
+        type = "image/jpeg"
+        putExtra(Intent.EXTRA_EMAIL, arrayOf(EMAIL_ADDRESS))
+        putExtra(
+            Intent.EXTRA_SUBJECT,
+            "FairScan ${BuildConfig.VERSION_NAME}"
+        )
+        if (imageFile != null) {
+            val uri = uriForFile(context, imageFile)
+            putExtra(Intent.EXTRA_STREAM, uri)
+            addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+        }
+    }
+    return Intent.createChooser(intent, null)
+}

app/src/main/res/values-cs/strings.xml

@@ -52,6 +52,8 @@
     <string name="share">Sdílet</string>
     <string name="share_document">Sdílet dokument</string>
     <string name="storage_permission_denied">Nelze uložit soubor: oprávnění bylo odmítnuto</string>
+    <string name="support">Podpora</string>
+    <string name="support_last_image">Nahlásit problém s posledním zachyceným obrázkem</string>
     <string name="turn_off_torch">Vypnout svítilnu</string>
     <string name="turn_on_torch">Zapnout svítilnu</string>
     <string name="unknown_size">Neznámá velikost</string>

app/src/main/res/values-de/strings.xml

@@ -52,6 +52,8 @@
     <string name="share">Teilen</string>
     <string name="share_document">Dokument teilen</string>
     <string name="storage_permission_denied">Datei kann nicht gespeichert werden: Berechtigung verweigert</string>
+    <string name="support">Support</string>
+    <string name="support_last_image">Problem mit dem zuletzt aufgenommenen Bild melden</string>
     <string name="turn_off_torch">Taschenlampe ausschalten</string>
     <string name="turn_on_torch">Taschenlampe einschalten</string>
     <string name="unknown_size">Unbekannte Größe</string>

app/src/main/res/values-es/strings.xml

@@ -52,6 +52,8 @@
     <string name="share">Compartir</string>
     <string name="share_document">Compartir documento</string>
     <string name="storage_permission_denied">No se puede guardar el archivo: permiso denegado</string>
+    <string name="support">Soporte</string>
+    <string name="support_last_image">Informar de un problema con la última imagen capturada</string>
     <string name="turn_off_torch">Apagar linterna</string>
     <string name="turn_on_torch">Encender linterna</string>
     <string name="unknown_size">Tamaño desconocido</string>

app/src/main/res/values-fr/strings.xml

@@ -52,6 +52,8 @@
     <string name="share">Partager</string>
     <string name="share_document">Partager le document</string>
     <string name="storage_permission_denied">Impossible d’enregistrer le fichier : permission refusée</string>
+    <string name="support">Support</string>
+    <string name="support_last_image">Signaler un problème avec la dernière image capturée</string>
     <string name="turn_off_torch">Éteindre la torche</string>
     <string name="turn_on_torch">Allumer la torche</string>
     <string name="unknown_size">Taille inconnue</string>

app/src/main/res/values-it/strings.xml

@@ -52,6 +52,8 @@
     <string name="share">Condividi</string>
     <string name="share_document">Condividi documento</string>
     <string name="storage_permission_denied">Impossibile salvare il file: permesso negato</string>
+    <string name="support">Supporto</string>
+    <string name="support_last_image">Segnala un problema con l’ultima immagine acquisita</string>
     <string name="turn_off_torch">Spegni la torcia</string>
     <string name="turn_on_torch">Accendi la torcia</string>
     <string name="unknown_size">Dimensione sconosciuta</string>

app/src/main/res/values-pt-rBR/strings.xml

@@ -52,6 +52,8 @@
     <string name="share">Compartilhar</string>
     <string name="share_document">Compartilhar documento</string>
     <string name="storage_permission_denied">Não foi possível salvar o arquivo: permissão negada</string>
+    <string name="support">Suporte</string>
+    <string name="support_last_image">Relatar um problema com a última imagem capturada</string>
     <string name="turn_off_torch">Desligar lanterna</string>
     <string name="turn_on_torch">Ligar lanterna</string>
     <string name="unknown_size">Tamanho desconhecido</string>

app/src/main/res/values-ru/strings.xml

@@ -52,6 +52,8 @@
     <string name="share">Поделиться</string>
     <string name="share_document">Поделиться документом</string>
     <string name="storage_permission_denied">Невозможно сохранить файл: доступ запрещён</string>
+    <string name="support">Поддержка</string>
+    <string name="support_last_image">Сообщить о проблеме с последним сделанным изображением</string>
     <string name="turn_off_torch">Выключить фонарик</string>
     <string name="turn_on_torch">Включить фонарик</string>
     <string name="unknown_size">Неизвестный размер</string>

app/src/main/res/values-zh-rTW/strings.xml

@@ -52,6 +52,8 @@
     <string name="share">分享</string>
     <string name="share_document">分享文件</string>
     <string name="storage_permission_denied">無法儲存檔案：權限遭拒</string>
+    <string name="support">支援</string>
+    <string name="support_last_image">回報最近拍攝影像的問題</string>
     <string name="turn_off_torch">關閉閃光燈</string>
     <string name="turn_on_torch">開啟閃光燈</string>
     <string name="unknown_size">未知大小</string>

app/src/main/res/values-zh/strings.xml

@@ -52,6 +52,8 @@
     <string name="share">共享</string>
     <string name="share_document">分享文档</string>
     <string name="storage_permission_denied">无法保存文件：权限被拒绝</string>
+    <string name="support">支持</string>
+    <string name="support_last_image">报告最近拍摄图像的问题</string>
     <string name="turn_off_torch">关闭手电筒</string>
     <string name="turn_on_torch">打开手电筒</string>
     <string name="unknown_size">未知大小</string>

app/src/main/res/values/strings.xml

@@ -56,6 +56,8 @@
     <string name="share">Share</string>
     <string name="share_document">Share document</string>
     <string name="storage_permission_denied">Cannot save file: permission was denied</string>
+    <string name="support">Support</string>
+    <string name="support_last_image">Report a problem with last captured image</string>
     <string name="turn_off_torch">Turn off torch</string>
     <string name="turn_on_torch">Turn on torch</string>
     <string name="unknown_size">Unknown size</string>

app/src/main/res/xml/file_paths.xml

@@ -6,4 +6,8 @@
     <external-path
         name="external_files"
         path="." />
+    <!-- source images (to send the last captured image) -->
+    <files-path
+        name="sources"
+        path="sources/" />
 </paths>

app/src/test/java/org/fairscan/app/data/ImageRepositoryTest.kt

@@ -242,6 +242,29 @@ class ImageRepositoryTest {
         assertThat(PageV2("1", 42, 0, quad, true).toMetadata()).isNull()
     }
 
+    @Test
+    fun last_added_source_file() {
+        val repo = repo()
+        assertThat(repo.lastAddedSourceFile()).isNull()
+        repo.add(byteArrayOf(101), byteArrayOf(51), metadata1)
+        assertThat(repo.lastAddedSourceFile()).hasBinaryContent(byteArrayOf(51))
+        Thread.sleep(1)
+        repo.add(byteArrayOf(102), byteArrayOf(52), metadata1)
+        assertThat(repo.lastAddedSourceFile()).hasBinaryContent(byteArrayOf(52))
+
+        val id = repo.imageIds().last()
+        repo.movePage(id, 0)
+        assertThat(repo.lastAddedSourceFile()).hasBinaryContent(byteArrayOf(52))
+        repo.delete(id)
+        assertThat(repo.lastAddedSourceFile()).hasBinaryContent(byteArrayOf(51))
+
+        val repo2 = repo()
+        assertThat(repo2.lastAddedSourceFile()).hasBinaryContent(byteArrayOf(51))
+
+        repo2.clear()
+        assertThat(repo2.lastAddedSourceFile()).isNull()
+    }
+
     private fun scanDir(): File = File(getFilesDir(), SCAN_DIR_NAME)
     private fun sourceDir(): File = File(getFilesDir(), SOURCE_DIR_NAME)