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This commit is contained in:
Jörn Ahlers
2025-12-11 10:43:06 +01:00
parent bd66f298e0
commit 0c045c8c91
8 changed files with 359 additions and 8 deletions
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12
app/src/main/AndroidManifest.xml
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@@ -22,10 +22,22 @@
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<provider
android:name="androidx.core.content.FileProvider"
android:authorities="${applicationId}.provider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_paths" />
</provider>
</application>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" android:required="false" />
</manifest>

111
app/src/main/java/de/jadehs/strassenschadenpro2/AlbumViewModel.kt Normal file
View File

@@ -0,0 +1,111 @@
package de.jadehs.strassenschadenpro2
import android.graphics.Bitmap
import android.graphics.BitmapFactory
import android.graphics.ImageDecoder
import androidx.compose.ui.graphics.ImageBitmap
import androidx.compose.ui.graphics.asImageBitmap
import androidx.core.content.FileProvider
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import de.jadehs.strassenschadenpro2.components.album.AlbumViewState
import de.jadehs.strassenschadenpro2.components.album.Intent
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.launch
import java.io.File
import kotlin.coroutines.CoroutineContext
class AlbumViewModel(private val coroutineContext: CoroutineContext): ViewModel() {
//region View State
private val _albumViewState: MutableStateFlow<AlbumViewState> = MutableStateFlow(AlbumViewState())
// exposes the ViewState to the composable view
val viewStateFlow: StateFlow<AlbumViewState>
get() = _albumViewState
// endregion
// region Intents
// receives user generated events and processes them in the provided coroutine context
fun onReceive(intent: Intent) = viewModelScope.launch(coroutineContext) {
when(intent) {
is Intent.OnPermissionGrantedWith -> {
// Create an empty image file in the app's cache directory
val tempFile = File.createTempFile(
"temp_image_file_", /* prefix */
".jpg", /* suffix */
intent.compositionContext.cacheDir /* cache directory */
)
// Create sandboxed url for this temp file - needed for the camera API
val uri = FileProvider.getUriForFile(intent.compositionContext,
"${BuildConfig.APPLICATION_ID}.provider", /* needs to match the provider information in the manifest */
tempFile
)
_albumViewState.value = _albumViewState.value.copy(tempFileUrl = uri)
}
is Intent.OnPermissionDenied -> {
// maybe log the permission denial event
println("User did not grant permission to use the camera")
}
is Intent.OnFinishPickingImagesWith -> {
if (intent.imageUrls.isNotEmpty()) {
// Handle picked images
val newImages = mutableListOf<ImageBitmap>()
val imageUriList = _albumViewState.value.imageUris.toMutableList()
for (eachImageUrl in intent.imageUrls) {
val inputStream = intent.compositionContext.contentResolver.openInputStream(eachImageUrl)
val bytes = inputStream?.readBytes()
inputStream?.close()
if (bytes != null) {
val bitmapOptions = BitmapFactory.Options()
bitmapOptions.inMutable = true
val bitmap: Bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.size, bitmapOptions)
newImages.add(bitmap.asImageBitmap())
imageUriList.add(eachImageUrl)
} else {
// error reading the bytes from the image url
println("The image that was picked could not be read from the device at this url: $eachImageUrl")
}
}
val currentViewState = _albumViewState.value
val newCopy = currentViewState.copy(
selectedPictures = (currentViewState.selectedPictures + newImages),
tempFileUrl = null,
imageUris = imageUriList
)
_albumViewState.value = newCopy
} else {
// user did not pick anything
}
}
is Intent.OnImageSavedWith -> {
val tempImageUrl = _albumViewState.value.tempFileUrl
if (tempImageUrl != null) {
val source = ImageDecoder.createSource(intent.compositionContext.contentResolver, tempImageUrl)
val currentPictures = _albumViewState.value.selectedPictures.toMutableList()
currentPictures.add(ImageDecoder.decodeBitmap(source).asImageBitmap())
val photoUriList = _albumViewState.value.imageUris.toMutableList()
photoUriList.add(tempImageUrl)
_albumViewState.value = _albumViewState.value.copy(
tempFileUrl = null,
selectedPictures = currentPictures,
imageUris = photoUriList
)
}
}
is Intent.OnImageSavingCanceled -> {
_albumViewState.value = _albumViewState.value.copy(tempFileUrl = null)
}
}
}
// endregion
}

31
app/src/main/java/de/jadehs/strassenschadenpro2/MapViewModel.kt
View File

@@ -20,7 +20,7 @@ import com.arcgismaps.mapping.layers.FeatureLayer
import com.arcgismaps.mapping.view.ScreenCoordinate
import com.arcgismaps.mapping.view.SingleTapConfirmedEvent
import com.arcgismaps.toolkit.geoviewcompose.MapViewProxy
import de.jadehs.strassenschadenpro2.pages.SettingsPage
import de.jadehs.strassenschadenpro2.components.album.PhotoData
import kotlinx.coroutines.launch
class MapViewModel(application: Application): AndroidViewModel(application) {
@@ -119,7 +119,7 @@ class MapViewModel(application: Application): AndroidViewModel(application) {
}
}
fun createFeatureWithAttributesAt(screenCoordinate: ScreenCoordinate, beschreibung: String, typ: String) {
fun createFeatureWithAttributesAt(screenCoordinate: ScreenCoordinate, beschreibung: String, typ: String,photosFromAlbum: List<PhotoData>) {
// Create the feature.
val feature = serviceFeatureTable?.createFeature()?.apply {
// Get the normalized geometry for the tapped location and use it as the feature's geometry.
@@ -138,13 +138,28 @@ class MapViewModel(application: Application): AndroidViewModel(application) {
serviceFeatureTable?.applyEdits()
// Update the feature to get the updated objectid - a temporary ID is used before the feature is added.
it.refresh()
var arcgisFeature = it as? ArcGISFeature
if (arcgisFeature != null && photosFromAlbum.size>0){
for (photoData in photosFromAlbum){
arcgisFeature.addAttachment(photoData.name,photoData.contentType,photoData.data)
}
serviceFeatureTable?.updateFeature(arcgisFeature)
serviceFeatureTable?.applyEdits()
}
// Confirm feature addition.
snackBarMessage = "Created feature ${it.attributes["objectid"]}"
}
}
}
fun createFeatureWithAttributesAtPoint(point: Point, beschreibung: String, typ: String) {
fun createFeatureWithAttributesAtPoint(
point: Point,
beschreibung: String,
typ: String,
photoDataList: List<PhotoData>
) {
// Create the feature.
val feature = serviceFeatureTable?.createFeature()?.apply {
// Get the normalized geometry for the tapped location and use it as the feature's geometry.
@@ -163,6 +178,16 @@ class MapViewModel(application: Application): AndroidViewModel(application) {
serviceFeatureTable?.applyEdits()
// Update the feature to get the updated objectid - a temporary ID is used before the feature is added.
it.refresh()
var arcgisFeature = it as? ArcGISFeature
if (arcgisFeature != null && photoDataList.size>0){
for (photoData in photoDataList){
arcgisFeature.addAttachment(photoData.name,photoData.contentType,photoData.data)
}
serviceFeatureTable?.updateFeature(arcgisFeature)
serviceFeatureTable?.applyEdits()
}
// Confirm feature addition.
snackBarMessage = "Created feature ${it.attributes["objectid"]}"
}

16
app/src/main/java/de/jadehs/strassenschadenpro2/components/album/AlbumEvents.kt Normal file
View File

@@ -0,0 +1,16 @@
package de.jadehs.strassenschadenpro2.components.album
import android.content.Context
import android.net.Uri
/**
* User generated events that can be triggered from the UI.
*/
sealed class Intent {
data class OnPermissionGrantedWith(val compositionContext: Context): Intent()
data object OnPermissionDenied: Intent()
data class OnImageSavedWith (val compositionContext: Context): Intent()
data object OnImageSavingCanceled: Intent()
data class OnFinishPickingImagesWith(val compositionContext: Context, val imageUrls: List<Uri>): Intent()
}

18
app/src/main/java/de/jadehs/strassenschadenpro2/components/album/AlbumViewState.kt Normal file
View File

@@ -0,0 +1,18 @@
package de.jadehs.strassenschadenpro2.components.album
import android.net.Uri
import androidx.compose.ui.graphics.ImageBitmap
data class AlbumViewState(
/**
* holds the URL of the temporary file which stores the image taken by the camera.
*/
val tempFileUrl: Uri? = null,
/**
* holds the list of images taken by camera or selected pictures from the gallery.
*/
val selectedPictures: List<ImageBitmap> = emptyList(),
val imageUris: List<Uri> = emptyList()
)

6
app/src/main/java/de/jadehs/strassenschadenpro2/components/album/PhotoData.kt Normal file
View File

@@ -0,0 +1,6 @@
package de.jadehs.strassenschadenpro2.components.album
data class PhotoData(
val name: String,
val contentType: String,
val data: ByteArray)

168
app/src/main/java/de/jadehs/strassenschadenpro2/pages/CreatePage.kt
View File

@@ -1,12 +1,26 @@
package de.jadehs.strassenschadenpro2.pages
import android.util.Log
import android.Manifest
import android.content.Context
import androidx.activity.compose.rememberLauncherForActivityResult
import androidx.activity.result.PickVisualMediaRequest
import androidx.activity.result.contract.ActivityResultContracts
import androidx.compose.foundation.Image
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.heightIn
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.lazy.grid.GridCells
import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
import androidx.compose.foundation.lazy.grid.itemsIndexed
import androidx.compose.foundation.rememberScrollState
import androidx.compose.foundation.verticalScroll
import androidx.compose.material3.Button
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.ModalBottomSheet
@@ -14,11 +28,14 @@ import androidx.compose.material3.OutlinedTextField
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberCoroutineScope
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.layout.ContentScale
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.text.input.TextFieldValue
import androidx.compose.ui.unit.dp
@@ -28,8 +45,12 @@ import com.arcgismaps.location.LocationDisplayAutoPanMode
import com.arcgismaps.toolkit.geoviewcompose.MapView
import com.arcgismaps.toolkit.geoviewcompose.rememberLocationDisplay
import com.google.android.gms.location.LocationServices
import de.jadehs.strassenschadenpro2.AlbumViewModel
import de.jadehs.strassenschadenpro2.MapViewModel
import de.jadehs.strassenschadenpro2.components.DropDownMenuBox
import de.jadehs.strassenschadenpro2.components.album.AlbumViewState
import de.jadehs.strassenschadenpro2.components.album.Intent
import de.jadehs.strassenschadenpro2.components.album.PhotoData
import kotlinx.coroutines.launch
@OptIn(ExperimentalMaterial3Api::class)
@@ -43,12 +64,16 @@ fun CreatePage(modifier: Modifier = Modifier, mapViewModel: MapViewModel) {
var enableSaveButton = remember { mutableStateOf(false) }
val coroutineScope = rememberCoroutineScope()
var albumViewModel = remember { AlbumViewModel(coroutineScope.coroutineContext) }
val locationDisplay = rememberLocationDisplay().apply {
setAutoPanMode(LocationDisplayAutoPanMode.Off)
}
val context = LocalContext.current
val coroutineScope = rememberCoroutineScope()
if (checkPermissions(context)) {
// Permissions are already granted.
LaunchedEffect(Unit) {
@@ -68,6 +93,7 @@ fun CreatePage(modifier: Modifier = Modifier, mapViewModel: MapViewModel) {
val fuesedLocationClient = remember { LocationServices.getFusedLocationProviderClient(context) }
Column(modifier = modifier.fillMaxSize()
.verticalScroll(rememberScrollState())
.padding(top = 16.dp, start = 16.dp, end = 16.dp, bottom = 16.dp),
verticalArrangement = Arrangement.Top,
horizontalAlignment = Alignment.CenterHorizontally) {
@@ -92,6 +118,7 @@ fun CreatePage(modifier: Modifier = Modifier, mapViewModel: MapViewModel) {
enableSaveButton.value = beschreibungTextFieldValue.value.text.isNotEmpty() && currentDamageType.value.isNotEmpty()
}
)
AlbumScreen(modifier= Modifier, viewModel = albumViewModel)
Row(modifier = Modifier.fillMaxWidth(),
horizontalArrangement = Arrangement.SpaceEvenly){
Button(enabled = enableSaveButton.value,
@@ -103,7 +130,8 @@ fun CreatePage(modifier: Modifier = Modifier, mapViewModel: MapViewModel) {
var point = Point(location.longitude,
location.latitude,
SpatialReference.wgs84())
mapViewModel.createFeatureWithAttributesAtPoint(point,beschreibung,typ)
val photoDataList = getPhotosFromAlbum(context,albumViewModel)
mapViewModel.createFeatureWithAttributesAtPoint(point,beschreibung,typ,photoDataList)
}
}
}){
@@ -133,10 +161,140 @@ fun CreatePage(modifier: Modifier = Modifier, mapViewModel: MapViewModel) {
val screenCoordinate = singleTapConfirmedEvent.screenCoordinate
val beschreibung = beschreibungTextFieldValue.value.text
val typ = currentDamageType.value
mapViewModel.createFeatureWithAttributesAt(screenCoordinate,beschreibung,typ)
val photoDataList=getPhotosFromAlbum(context,albumViewModel)
mapViewModel.createFeatureWithAttributesAt(
screenCoordinate,
beschreibung,
typ,
photoDataList
)
},
)
}
}
}
}
@Composable
fun AlbumScreen(modifier: Modifier = Modifier, viewModel: AlbumViewModel) {
// collecting the flow from the view model as a state allows our ViewModel and View
// to be in sync with each other.
val viewState: AlbumViewState by viewModel.viewStateFlow.collectAsState()
val currentContext = LocalContext.current
// launches photo picker
val pickImageFromAlbumLauncher = rememberLauncherForActivityResult(ActivityResultContracts.PickMultipleVisualMedia()) { urls ->
viewModel.onReceive(Intent.OnFinishPickingImagesWith(currentContext, urls))
}
// launches camera
val cameraLauncher = rememberLauncherForActivityResult(ActivityResultContracts.TakePicture()) { isImageSaved ->
if (isImageSaved) {
viewModel.onReceive(Intent.OnImageSavedWith(currentContext))
} else {
// handle image saving error or cancellation
viewModel.onReceive(Intent.OnImageSavingCanceled)
}
}
// launches camera permissions
val permissionLauncher = rememberLauncherForActivityResult(ActivityResultContracts.RequestPermission()) { permissionGranted ->
if (permissionGranted) {
viewModel.onReceive(Intent.OnPermissionGrantedWith(currentContext))
} else {
// handle permission denied such as:
viewModel.onReceive(Intent.OnPermissionDenied)
}
}
// this ensures that the camera is launched only once when the url of the temp file changes
LaunchedEffect(key1 = viewState.tempFileUrl) {
viewState.tempFileUrl?.let {
cameraLauncher.launch(it)
}
}
// basic view that has 2 buttons and a grid for selected pictures
Column(modifier = Modifier.padding(20.dp),
horizontalAlignment = Alignment.CenterHorizontally) {
Row {
Button(onClick = {
// get user's permission first to use camera
permissionLauncher.launch(Manifest.permission.CAMERA)
}) {
Text(text = "Take a photo")
}
Spacer(modifier = Modifier.width(16.dp))
Button(onClick = {
// Image picker does not require special permissions and can be activated right away
val mediaRequest = PickVisualMediaRequest(ActivityResultContracts.PickVisualMedia.ImageOnly)
pickImageFromAlbumLauncher.launch(mediaRequest)
}) {
Text(text = "Pick a picture")
}
}
Spacer(modifier = Modifier.height(16.dp))
Text(text = "Selected Pictures")
LazyVerticalGrid(modifier = Modifier.fillMaxWidth().heightIn(0.dp, 1200.dp),
columns = GridCells.Adaptive(150.dp),
userScrollEnabled = false) {
itemsIndexed(viewState.selectedPictures) { index, picture ->
Image(modifier = Modifier.padding(8.dp),
bitmap = picture,
contentDescription = null,
contentScale = ContentScale.FillWidth
)
}
}
}
}
fun getPhotosFromAlbum(context: Context,albumViewModel: AlbumViewModel): List<PhotoData>{
var photoDataList = mutableListOf<PhotoData>()
albumViewModel.viewStateFlow.value.imageUris.forEach { uri ->
context.contentResolver.openInputStream(uri).use { inputStream ->
try {
val name = "image_${System.currentTimeMillis()}.png"
val contentType = "image/png"
val byteArray = inputStream?.readBytes()
if (byteArray!=null) {
photoDataList.add(
PhotoData(
name,
contentType,
byteArray
)
)
}
}catch (e: Exception){
}
}
}
return photoDataList
}

5
app/src/main/res/xml/file_paths.xml Normal file
View File

@@ -0,0 +1,5 @@
<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<!-- creates a reference to the cache folder that the system maintains -->
<cache-path name="temporary_camera_images" path="/" />
</paths>