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camerax with preview

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This commit is contained in:
Pierre-Yves Nicolas
2025-05-09 19:29:47 +02:00
parent 5957a9aa4e
commit 62b2a40bb0
15 changed files with 295 additions and 12 deletions
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1
.idea/.name generated Normal file
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@@ -0,0 +1 @@
MyScan

6
.idea/AndroidProjectSystem.xml generated Normal file
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@@ -0,0 +1,6 @@
<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="AndroidProjectSystem">
<option name="providerId" value="com.android.tools.idea.GradleProjectSystem" />
</component>
</project>

10
.idea/deploymentTargetSelector.xml generated Normal file
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@@ -0,0 +1,10 @@
<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="deploymentTargetSelector">
<selectionStates>
<SelectionState runConfigName="app">
<option name="selectionMode" value="DROPDOWN" />
</SelectionState>
</selectionStates>
</component>
</project>

19
.idea/gradle.xml generated Normal file
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@@ -0,0 +1,19 @@
<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="GradleMigrationSettings" migrationVersion="1" />
<component name="GradleSettings">
<option name="linkedExternalProjectsSettings">
<GradleProjectSettings>
<option name="testRunner" value="CHOOSE_PER_TEST" />
<option name="externalProjectPath" value="$PROJECT_DIR$" />
<option name="gradleJvm" value="#GRADLE_LOCAL_JAVA_HOME" />
<option name="modules">
<set>
<option value="$PROJECT_DIR$" />
<option value="$PROJECT_DIR$/app" />
</set>
</option>
</GradleProjectSettings>
</option>
</component>
</project>

61
.idea/inspectionProfiles/Project_Default.xml generated Normal file
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@@ -0,0 +1,61 @@
<component name="InspectionProjectProfileManager">
<profile version="1.0">
<option name="myName" value="Project Default" />
<inspection_tool class="ComposePreviewDimensionRespectsLimit" enabled="true" level="WARNING" enabled_by_default="true">
<option name="composableFile" value="true" />
<option name="previewFile" value="true" />
</inspection_tool>
<inspection_tool class="ComposePreviewMustBeTopLevelFunction" enabled="true" level="ERROR" enabled_by_default="true">
<option name="composableFile" value="true" />
<option name="previewFile" value="true" />
</inspection_tool>
<inspection_tool class="ComposePreviewNeedsComposableAnnotation" enabled="true" level="ERROR" enabled_by_default="true">
<option name="composableFile" value="true" />
<option name="previewFile" value="true" />
</inspection_tool>
<inspection_tool class="ComposePreviewNotSupportedInUnitTestFiles" enabled="true" level="ERROR" enabled_by_default="true">
<option name="composableFile" value="true" />
<option name="previewFile" value="true" />
</inspection_tool>
<inspection_tool class="GlancePreviewDimensionRespectsLimit" enabled="true" level="WARNING" enabled_by_default="true">
<option name="composableFile" value="true" />
</inspection_tool>
<inspection_tool class="GlancePreviewMustBeTopLevelFunction" enabled="true" level="ERROR" enabled_by_default="true">
<option name="composableFile" value="true" />
</inspection_tool>
<inspection_tool class="GlancePreviewNeedsComposableAnnotation" enabled="true" level="ERROR" enabled_by_default="true">
<option name="composableFile" value="true" />
</inspection_tool>
<inspection_tool class="GlancePreviewNotSupportedInUnitTestFiles" enabled="true" level="ERROR" enabled_by_default="true">
<option name="composableFile" value="true" />
</inspection_tool>
<inspection_tool class="PreviewAnnotationInFunctionWithParameters" enabled="true" level="ERROR" enabled_by_default="true">
<option name="composableFile" value="true" />
<option name="previewFile" value="true" />
</inspection_tool>
<inspection_tool class="PreviewApiLevelMustBeValid" enabled="true" level="ERROR" enabled_by_default="true">
<option name="composableFile" value="true" />
<option name="previewFile" value="true" />
</inspection_tool>
<inspection_tool class="PreviewDeviceShouldUseNewSpec" enabled="true" level="WEAK WARNING" enabled_by_default="true">
<option name="composableFile" value="true" />
<option name="previewFile" value="true" />
</inspection_tool>
<inspection_tool class="PreviewFontScaleMustBeGreaterThanZero" enabled="true" level="ERROR" enabled_by_default="true">
<option name="composableFile" value="true" />
<option name="previewFile" value="true" />
</inspection_tool>
<inspection_tool class="PreviewMultipleParameterProviders" enabled="true" level="ERROR" enabled_by_default="true">
<option name="composableFile" value="true" />
<option name="previewFile" value="true" />
</inspection_tool>
<inspection_tool class="PreviewParameterProviderOnFirstParameter" enabled="true" level="ERROR" enabled_by_default="true">
<option name="composableFile" value="true" />
<option name="previewFile" value="true" />
</inspection_tool>
<inspection_tool class="PreviewPickerAnnotation" enabled="true" level="ERROR" enabled_by_default="true">
<option name="composableFile" value="true" />
<option name="previewFile" value="true" />
</inspection_tool>
</profile>
</component>

6
.idea/kotlinc.xml generated Normal file
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@@ -0,0 +1,6 @@
<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="KotlinJpsPluginSettings">
<option name="version" value="2.0.21" />
</component>
</project>

10
.idea/migrations.xml generated Normal file
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@@ -0,0 +1,10 @@
<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="ProjectMigrations">
<option name="MigrateToGradleLocalJavaHome">
<set>
<option value="$PROJECT_DIR$" />
</set>
</option>
</component>
</project>

10
.idea/misc.xml generated Normal file
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@@ -0,0 +1,10 @@
<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="ExternalStorageConfigurationManager" enabled="true" />
<component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="jbr-21" project-jdk-type="JavaSDK">
<output url="file://$PROJECT_DIR$/build/classes" />
</component>
<component name="ProjectType">
<option name="id" value="Android" />
</component>
</project>

17
.idea/runConfigurations.xml generated Normal file
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@@ -0,0 +1,17 @@
<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="RunConfigurationProducerService">
<option name="ignoredProducers">
<set>
<option value="com.intellij.execution.junit.AbstractAllInDirectoryConfigurationProducer" />
<option value="com.intellij.execution.junit.AllInPackageConfigurationProducer" />
<option value="com.intellij.execution.junit.PatternConfigurationProducer" />
<option value="com.intellij.execution.junit.TestInClassConfigurationProducer" />
<option value="com.intellij.execution.junit.UniqueIdConfigurationProducer" />
<option value="com.intellij.execution.junit.testDiscovery.JUnitTestDiscoveryConfigurationProducer" />
<option value="org.jetbrains.kotlin.idea.junit.KotlinJUnitRunConfigurationProducer" />
<option value="org.jetbrains.kotlin.idea.junit.KotlinPatternConfigurationProducer" />
</set>
</option>
</component>
</project>

6
.idea/vcs.xml generated Normal file
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@@ -0,0 +1,6 @@
<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="VcsDirectoryMappings">
<mapping directory="$PROJECT_DIR$" vcs="Git" />
</component>
</project>

5
app/build.gradle.kts
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@@ -49,6 +49,11 @@ dependencies {
implementation(libs.androidx.ui.graphics) implementation(libs.androidx.ui.graphics)
implementation(libs.androidx.ui.tooling.preview) implementation(libs.androidx.ui.tooling.preview)
implementation(libs.androidx.material3) implementation(libs.androidx.material3)
implementation(libs.androidx.camera.core)
implementation(libs.androidx.camera.camera2)
implementation(libs.androidx.camera.lifecycle)
implementation(libs.androidx.camera.view)
testImplementation(libs.junit) testImplementation(libs.junit)
androidTestImplementation(libs.androidx.junit) androidTestImplementation(libs.androidx.junit)
androidTestImplementation(libs.androidx.espresso.core) androidTestImplementation(libs.androidx.espresso.core)

5
app/src/main/AndroidManifest.xml
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@@ -2,6 +2,11 @@
<manifest xmlns:android="http://schemas.android.com/apk/res/android" <manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"> xmlns:tools="http://schemas.android.com/tools">
<uses-feature
android:name="android.hardware.camera"
android:required="false" />
<uses-permission android:name="android.permission.CAMERA" />
<application <application
android:allowBackup="true" android:allowBackup="true"
android:dataExtractionRules="@xml/data_extraction_rules" android:dataExtractionRules="@xml/data_extraction_rules"

23
app/src/main/java/org/mydomain/myscan/MainActivity.kt
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@@ -4,14 +4,19 @@ import android.os.Bundle
import androidx.activity.ComponentActivity import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent import androidx.activity.compose.setContent
import androidx.activity.enableEdgeToEdge import androidx.activity.enableEdgeToEdge
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxSize import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.padding import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.width
import androidx.compose.material3.Scaffold import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text import androidx.compose.material3.Text
import androidx.compose.runtime.Composable import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier import androidx.compose.ui.Modifier
import androidx.compose.ui.tooling.preview.Preview import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import org.mydomain.myscan.ui.theme.MyScanTheme import org.mydomain.myscan.ui.theme.MyScanTheme
import org.mydomain.myscan.view.CameraScreen
class MainActivity : ComponentActivity() { class MainActivity : ComponentActivity() {
override fun onCreate(savedInstanceState: Bundle?) { override fun onCreate(savedInstanceState: Bundle?) {
@@ -19,11 +24,13 @@ class MainActivity : ComponentActivity() {
enableEdgeToEdge() enableEdgeToEdge()
setContent { setContent {
MyScanTheme { MyScanTheme {
Scaffold(modifier = Modifier.fillMaxSize()) { innerPadding -> Scaffold(/*modifier = Modifier.fillMaxSize()*/) { innerPadding ->
Greeting( Column {
name = "Android", Greeting(modifier = Modifier.padding(innerPadding))
modifier = Modifier.padding(innerPadding) Box(/*modifier = Modifier.width(300.dp)*/) {
) CameraScreen { }
}
}
} }
} }
} }
@@ -31,9 +38,9 @@ class MainActivity : ComponentActivity() {
} }
@Composable @Composable
fun Greeting(name: String, modifier: Modifier = Modifier) { fun Greeting(modifier: Modifier = Modifier) {
Text( Text(
text = "Hello $name!", text = "Scan your document",
modifier = modifier modifier = modifier
) )
} }
@@ -42,6 +49,6 @@ fun Greeting(name: String, modifier: Modifier = Modifier) {
@Composable @Composable
fun GreetingPreview() { fun GreetingPreview() {
MyScanTheme { MyScanTheme {
Greeting("Android") Greeting()
} }
} }

114
app/src/main/java/org/mydomain/myscan/view/Camera.kt Normal file
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@@ -0,0 +1,114 @@
package org.mydomain.myscan.view
import android.content.pm.PackageManager.PERMISSION_GRANTED
import android.view.ViewGroup.LayoutParams.MATCH_PARENT
import android.widget.LinearLayout
import android.widget.Toast
import androidx.activity.compose.rememberLauncherForActivityResult
import androidx.activity.result.contract.ActivityResultContracts
import androidx.camera.core.AspectRatio.RATIO_4_3
import androidx.camera.core.CameraSelector
import androidx.camera.core.ImageAnalysis
import androidx.camera.core.ImageProxy
import androidx.camera.core.Preview
import androidx.camera.lifecycle.ProcessCameraProvider
import androidx.camera.view.PreviewView
import androidx.compose.runtime.Composable
import androidx.compose.runtime.DisposableEffect
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
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.lifecycle.LifecycleOwner
import com.google.common.util.concurrent.ListenableFuture
import java.util.concurrent.ExecutorService
import java.util.concurrent.Executors
@Composable
fun CameraScreen(
onImageAnalyzed: (ImageProxy) -> Unit,
) {
val context = LocalContext.current
val requestPermissionLauncher = rememberLauncherForActivityResult(
ActivityResultContracts.RequestPermission()
) { isGranted: Boolean ->
if (!isGranted) {
Toast.makeText(context, "Camera permission was denied", Toast.LENGTH_SHORT).show()
}
}
LaunchedEffect(Unit) {
val camera = android.Manifest.permission.CAMERA
if (ContextCompat.checkSelfPermission(context, camera) != PERMISSION_GRANTED) {
requestPermissionLauncher.launch(camera)
}
}
CameraPreview(onImageAnalyzed = { imageProxy -> onImageAnalyzed(imageProxy) })
}
@Composable
fun CameraPreview(
modifier: Modifier = Modifier,
onImageAnalyzed: (ImageProxy) -> Unit,
) {
val context = LocalContext.current
val lifecycleOwner = LocalLifecycleOwner.current
val cameraProviderFuture by remember {
mutableStateOf(ProcessCameraProvider.getInstance(context))
}
DisposableEffect(lifecycleOwner) {
onDispose {
cameraProviderFuture.get().unbindAll()
}
}
AndroidView(modifier = modifier, factory = {
val previewView = PreviewView(it).apply {
layoutParams = LinearLayout.LayoutParams(MATCH_PARENT, MATCH_PARENT)
scaleType = PreviewView.ScaleType.FIT_CENTER
}
val executor = Executors.newSingleThreadExecutor()
cameraProviderFuture.addListener({
bindCameraUseCases(
lifecycleOwner = lifecycleOwner,
cameraProviderFuture = cameraProviderFuture,
executor = executor,
previewView = previewView,
onImageAnalyzed = onImageAnalyzed
)
}, ContextCompat.getMainExecutor(context))
previewView
})
}
fun bindCameraUseCases(
lifecycleOwner: LifecycleOwner,
cameraProviderFuture: ListenableFuture<ProcessCameraProvider>,
executor: ExecutorService,
previewView: PreviewView,
onImageAnalyzed: (ImageProxy) -> Unit,
) {
val preview: Preview = Preview.Builder().setTargetAspectRatio(RATIO_4_3).build()
preview.surfaceProvider = previewView.surfaceProvider
val cameraSelector: CameraSelector =
CameraSelector.Builder().requireLensFacing(CameraSelector.LENS_FACING_BACK).build()
val imageAnalysis = ImageAnalysis.Builder().setTargetAspectRatio(RATIO_4_3)
.setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST)
.setOutputImageFormat(ImageAnalysis.OUTPUT_IMAGE_FORMAT_RGBA_8888).build()
imageAnalysis.setAnalyzer(executor, onImageAnalyzed)
val cameraProvider = cameraProviderFuture.get()
cameraProvider.bindToLifecycle(lifecycleOwner, cameraSelector, imageAnalysis, preview)
}

14
gradle/libs.versions.toml
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@@ -1,13 +1,14 @@
[versions] [versions]
agp = "8.9.1" agp = "8.9.2"
kotlin = "2.0.21" kotlin = "2.1.0"
coreKtx = "1.16.0" coreKtx = "1.16.0"
junit = "4.13.2" junit = "4.13.2"
junitVersion = "1.2.1" junitVersion = "1.2.1"
espressoCore = "3.6.1" espressoCore = "3.6.1"
lifecycleRuntimeKtx = "2.8.7" lifecycleRuntimeKtx = "2.9.0"
activityCompose = "1.10.1" activityCompose = "1.10.1"
composeBom = "2024.09.00" composeBom = "2025.05.00"
camerax = "1.4.2"
[libraries] [libraries]
androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" } androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
@@ -25,6 +26,11 @@ androidx-ui-test-manifest = { group = "androidx.compose.ui", name = "ui-test-man
androidx-ui-test-junit4 = { group = "androidx.compose.ui", name = "ui-test-junit4" } androidx-ui-test-junit4 = { group = "androidx.compose.ui", name = "ui-test-junit4" }
androidx-material3 = { group = "androidx.compose.material3", name = "material3" } androidx-material3 = { group = "androidx.compose.material3", name = "material3" }
androidx-camera-core = { group = "androidx.camera", name = "camera-core", version.ref = "camerax" }
androidx-camera-camera2 = { group = "androidx.camera", name = "camera-camera2", version.ref = "camerax" }
androidx-camera-lifecycle = { group = "androidx.camera", name = "camera-lifecycle", version.ref = "camerax" }
androidx-camera-view = { group = "androidx.camera", name = "camera-view", version.ref = "camerax" }
[plugins] [plugins]
android-application = { id = "com.android.application", version.ref = "agp" } android-application = { id = "com.android.application", version.ref = "agp" }
kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" } kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }