Implemented asking for Camera permission

composeApp/build.gradle.kts

@@ -106,6 +106,7 @@ kotlin {
         androidMain.dependencies {
             implementation(compose.preview)
             implementation(libs.androidx.activity.compose)
+            implementation(libs.androidx.fragment) // to fix bug IllegalArgumentException: Can only use lower 16 bits for requestCode
             implementation(libs.androidx.biometric)
 
             implementation(libs.favre.bcrypt)

composeApp/src/androidMain/kotlin/net/codinux/banking/ui/MainActivity.kt

@@ -2,6 +2,7 @@ package net.codinux.banking.ui
 
 import android.os.Bundle
 import androidx.activity.compose.setContent
+import androidx.activity.result.contract.ActivityResultContracts
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.fragment.app.FragmentActivity
@@ -11,6 +12,11 @@ import net.codinux.banking.ui.service.BiometricAuthenticationService
 import net.codinux.banking.ui.service.ImageService
 
 class MainActivity : FragmentActivity() {
+
+    private val request = ActivityResultContracts.RequestMultiplePermissions()
+
+    private val activityResultLauncher = registerForActivityResult(request) { }
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
@@ -23,8 +29,29 @@ class MainActivity : FragmentActivity() {
             App()
         }
     }
+
+
+    fun requestPermissions(requiredPermissions: List<String>): Boolean {
+        val requiredPermissionsArray = requiredPermissions.toTypedArray()
+
+        activityResultLauncher.launch(requiredPermissionsArray)
+
+        var result = request.getSynchronousResult(baseContext, requiredPermissionsArray)
+        while (result == null) {
+            result = request.getSynchronousResult(baseContext, requiredPermissionsArray)
+        }
+
+        return if (result.value != null) {
+            val allPermissionsGranted = result.value.entries.filter { it.key in requiredPermissions }.all { it.value == true }
+            allPermissionsGranted
+        } else {
+            false
+        }
+    }
+
 }
 
+
 @Preview
 @Composable
 fun AppAndroidPreview() {

composeApp/src/androidMain/kotlin/net/codinux/banking/ui/service/PermissionsService.kt

@@ -0,0 +1,13 @@
+package net.codinux.banking.ui.service
+
+import android.content.Context
+import android.content.pm.PackageManager
+import androidx.core.content.ContextCompat
+
+object PermissionsService {
+
+    fun allPermissionsGranted(baseContext: Context, permissions: List<String>) = permissions.all {
+        ContextCompat.checkSelfPermission(baseContext, it) == PackageManager.PERMISSION_GRANTED
+    }
+
+}

composeApp/src/androidMain/kotlin/net/codinux/banking/ui/service/QrCodeService.android.kt

@@ -1,5 +1,6 @@
 package net.codinux.banking.ui.service
 
+import android.Manifest
 import androidx.camera.core.*
 import androidx.camera.lifecycle.ProcessCameraProvider
 import androidx.camera.view.PreviewView
@@ -7,15 +8,14 @@ import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.LocalLifecycleOwner
 import androidx.compose.ui.viewinterop.AndroidView
 import androidx.core.content.ContextCompat
-import androidx.fragment.app.FragmentActivity
 import com.google.zxing.*
 import com.google.zxing.common.HybridBinarizer
 import com.google.zxing.qrcode.QRCodeReader
 import net.codinux.banking.persistence.AndroidContext
+import net.codinux.banking.ui.MainActivity
 import net.codinux.banking.ui.config.DI
 import net.codinux.log.logger
 import java.nio.ByteBuffer
@@ -23,6 +23,8 @@ import java.util.concurrent.Executors
 
 actual object QrCodeService {
 
+    private val RequiredPermissions = listOf(Manifest.permission.CAMERA)
+
     private val cameraExecutor = Executors.newCachedThreadPool()
 
     private val log by logger()
@@ -32,16 +34,17 @@ actual object QrCodeService {
 
     @Composable
     actual fun readQrCodeFromCamera(resultCallback: (QrCodeReadResult) -> Unit) {
-        val context = AndroidContext.mainActivity
-        val cameraProviderFuture = ProcessCameraProvider.getInstance(context)
+        val mainActivity = LocalLifecycleOwner.current as MainActivity // we only have MainActivity, so we can be sure that LocalLifecycleOwner.current is MainActivity
 
-        val localContext = LocalContext.current
-        log.info { "LocalContext.current = ${localContext.javaClass} ${localContext}" }
+        if (PermissionsService.allPermissionsGranted(AndroidContext.applicationContext, RequiredPermissions) == false &&
+            mainActivity.requestPermissions(RequiredPermissions) == false) {
+            return // we don't have the permission to start the camera
+        }
+
+        val cameraProviderFuture = ProcessCameraProvider.getInstance(mainActivity)
 
-        val lifecycleOwner = LocalLifecycleOwner.current
-//        val context = LocalContext.current
         val previewView = remember {
-            PreviewView(context)
+            PreviewView(mainActivity)
         }
 
         cameraProviderFuture.addListener({
@@ -69,13 +72,13 @@ actual object QrCodeService {
                 cameraProvider.unbindAll()
 
                 // Bind use cases to camera
-                cameraProvider.bindToLifecycle(context as FragmentActivity, cameraSelector, preview, imageAnalyzer)
+                cameraProvider.bindToLifecycle(mainActivity, cameraSelector, preview, imageAnalyzer)
 
             } catch(e: Exception) {
                 log.error(e) { "Use case binding failed" }
             }
 
-        }, ContextCompat.getMainExecutor(context))
+        }, ContextCompat.getMainExecutor(mainActivity))
 
 
         AndroidView(factory = { previewView }, modifier = Modifier.fillMaxSize())

gradle/libs.versions.toml

@@ -24,6 +24,7 @@ android-targetSdk = "34"
 
 androidx-activityCompose = "1.9.2"
 androidx-lifecycle = "2.8.2"
+androidx-fragment = "1.8.3"
 androidx-biometric = "1.1.0"
 compose-plugin = "1.6.11"
 
@@ -57,6 +58,7 @@ sqldelight-native-driver = { module = "app.cash.sqldelight:native-driver", versi
 androidx-activity-compose = { module = "androidx.activity:activity-compose", version.ref = "androidx-activityCompose" }
 androidx-lifecycle-viewmodel = { group = "org.jetbrains.androidx.lifecycle", name = "lifecycle-viewmodel", version.ref = "androidx-lifecycle" }
 androidx-lifecycle-runtime-compose = { group = "org.jetbrains.androidx.lifecycle", name = "lifecycle-runtime-compose", version.ref = "androidx-lifecycle" }
+androidx-fragment = { group = "androidx.fragment", name = "fragment", version.ref = "androidx-fragment" }
 androidx-biometric = { group = "androidx.biometric", name = "biometric", version.ref = "androidx-biometric" }
 kotlinx-coroutines-swing = { group = "org.jetbrains.kotlinx", name = "kotlinx-coroutines-swing", version.ref = "kotlinx-coroutines" }