├── .gitignore ├── .idea ├── codeStyles │ ├── Project.xml │ └── codeStyleConfig.xml ├── compiler.xml ├── encodings.xml ├── gradle.xml ├── misc.xml └── runConfigurations.xml ├── LICENSE ├── README.md ├── app ├── .gitignore ├── build.gradle ├── proguard-rules.pro └── src │ ├── androidTest │ └── java │ │ └── com │ │ └── captechventures │ │ └── cameraxsample │ │ └── ExampleInstrumentedTest.kt │ ├── main │ ├── AndroidManifest.xml │ ├── java │ │ └── com │ │ │ └── captechventures │ │ │ └── cameraxsample │ │ │ ├── AutoFitPreviewBuilder.kt │ │ │ ├── CameraFragment.kt │ │ │ ├── MainActivity.kt │ │ │ ├── PhotoFragment.kt │ │ │ └── PhraseEntryFragment.kt │ └── res │ │ ├── drawable-v24 │ │ └── ic_launcher_foreground.xml │ │ ├── drawable │ │ ├── ic_arrow_back.xml │ │ ├── ic_launcher_background.xml │ │ └── ic_photo_camera.xml │ │ ├── layout │ │ ├── activity_main.xml │ │ ├── fragment_camera.xml │ │ ├── fragment_photo.xml │ │ └── fragment_phrase_entry.xml │ │ ├── menu │ │ └── menu_main.xml │ │ ├── mipmap-anydpi-v26 │ │ ├── ic_launcher.xml │ │ └── ic_launcher_round.xml │ │ ├── mipmap-hdpi │ │ ├── ic_launcher.png │ │ └── ic_launcher_round.png │ │ ├── mipmap-mdpi │ │ ├── ic_launcher.png │ │ └── ic_launcher_round.png │ │ ├── mipmap-xhdpi │ │ ├── ic_launcher.png │ │ └── ic_launcher_round.png │ │ ├── mipmap-xxhdpi │ │ ├── ic_launcher.png │ │ └── ic_launcher_round.png │ │ ├── mipmap-xxxhdpi │ │ ├── ic_launcher.png │ │ └── ic_launcher_round.png │ │ └── values │ │ ├── colors.xml │ │ ├── dimens.xml │ │ ├── strings.xml │ │ └── styles.xml │ └── test │ └── java │ └── com │ └── captechventures │ └── cameraxsample │ └── ExampleUnitTest.kt ├── build.gradle ├── demo.gif ├── gradle.properties ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat └── settings.gradle /.gitignore: -------------------------------------------------------------------------------- 1 | *.iml 2 | .gradle 3 | /local.properties 4 | /.idea/caches 5 | /.idea/libraries 6 | /.idea/modules.xml 7 | /.idea/workspace.xml 8 | /.idea/navEditor.xml 9 | /.idea/assetWizardSettings.xml 10 | .DS_Store 11 | /build 12 | /captures 13 | .externalNativeBuild 14 | -------------------------------------------------------------------------------- /.idea/codeStyles/Project.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 6 | 7 | 9 | 10 | 14 | 15 | 118 | 119 | 121 | 122 | -------------------------------------------------------------------------------- /.idea/codeStyles/codeStyleConfig.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 5 | -------------------------------------------------------------------------------- /.idea/compiler.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | -------------------------------------------------------------------------------- /.idea/encodings.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | -------------------------------------------------------------------------------- /.idea/gradle.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 17 | 18 | -------------------------------------------------------------------------------- /.idea/misc.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 14 | -------------------------------------------------------------------------------- /.idea/runConfigurations.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 11 | 12 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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The text should be enclosed in the appropriate 184 | comment syntax for the file format. We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright 2019 Alex Townsend 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # CameraX Sample 2 | 3 | A sample application that uses the new Jetpack CameraX support library. The app takes input for a phrase from the user, and then uses CameraX and MLKit Text Recognition to preview the camera feed, analyze the image buffer to search for the phrase, and capture the image once the phrase has been detected. 4 | 5 | To build this locally, you must [create a Firebase project and add the google-services.json](https://firebase.google.com/docs/android/setup), then build. 6 | 7 | ## Demo Gif 8 | ![Exceptional quality gif](demo.gif) 9 | -------------------------------------------------------------------------------- /app/.gitignore: -------------------------------------------------------------------------------- 1 | /build 2 | google-services.json 3 | -------------------------------------------------------------------------------- /app/build.gradle: -------------------------------------------------------------------------------- 1 | apply plugin: 'com.android.application' 2 | 3 | apply plugin: 'kotlin-android' 4 | 5 | apply plugin: 'kotlin-android-extensions' 6 | 7 | android { 8 | compileSdkVersion 28 9 | defaultConfig { 10 | applicationId "com.captechventures.cameraxsample" 11 | minSdkVersion 21 12 | targetSdkVersion 28 13 | versionCode 1 14 | versionName "1.0" 15 | testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" 16 | } 17 | buildTypes { 18 | release { 19 | minifyEnabled false 20 | proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro' 21 | } 22 | } 23 | } 24 | 25 | def camerax_version = "1.0.0-alpha01" 26 | 27 | dependencies { 28 | implementation fileTree(dir: 'libs', include: ['*.jar']) 29 | implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version" 30 | implementation 'androidx.appcompat:appcompat:1.1.0-alpha05' 31 | implementation 'androidx.core:core-ktx:1.1.0-alpha05' 32 | implementation 'androidx.constraintlayout:constraintlayout:1.1.3' 33 | implementation 'com.google.android.material:material:1.0.0' 34 | testImplementation 'junit:junit:4.12' 35 | androidTestImplementation 'androidx.test:runner:1.1.1' 36 | androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1' 37 | implementation "androidx.camera:camera-core:${camerax_version}" 38 | implementation "androidx.camera:camera-camera2:${camerax_version}" 39 | implementation 'com.google.firebase:firebase-ml-vision:20.0.0' 40 | implementation 'com.google.firebase:firebase-core:16.0.9' 41 | implementation 'androidx.fragment:fragment-ktx:1.0.0' 42 | 43 | implementation 'com.github.bumptech.glide:glide:4.9.0' 44 | annotationProcessor 'com.github.bumptech.glide:compiler:4.9.0' 45 | } 46 | 47 | apply plugin: 'com.google.gms.google-services' -------------------------------------------------------------------------------- /app/proguard-rules.pro: -------------------------------------------------------------------------------- 1 | # Add project specific ProGuard rules here. 2 | # You can control the set of applied configuration files using the 3 | # proguardFiles setting in build.gradle. 4 | # 5 | # For more details, see 6 | # http://developer.android.com/guide/developing/tools/proguard.html 7 | 8 | # If your project uses WebView with JS, uncomment the following 9 | # and specify the fully qualified class name to the JavaScript interface 10 | # class: 11 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview { 12 | # public *; 13 | #} 14 | 15 | # Uncomment this to preserve the line number information for 16 | # debugging stack traces. 17 | #-keepattributes SourceFile,LineNumberTable 18 | 19 | # If you keep the line number information, uncomment this to 20 | # hide the original source file name. 21 | #-renamesourcefileattribute SourceFile 22 | -------------------------------------------------------------------------------- /app/src/androidTest/java/com/captechventures/cameraxsample/ExampleInstrumentedTest.kt: -------------------------------------------------------------------------------- 1 | package com.captechventures.cameraxsample 2 | 3 | import androidx.test.InstrumentationRegistry 4 | import androidx.test.runner.AndroidJUnit4 5 | 6 | import org.junit.Test 7 | import org.junit.runner.RunWith 8 | 9 | import org.junit.Assert.* 10 | 11 | /** 12 | * Instrumented test, which will execute on an Android device. 13 | * 14 | * See [testing documentation](http://d.android.com/tools/testing). 15 | */ 16 | @RunWith(AndroidJUnit4::class) 17 | class ExampleInstrumentedTest { 18 | @Test 19 | fun useAppContext() { 20 | // Context of the app under test. 21 | val appContext = InstrumentationRegistry.getTargetContext() 22 | assertEquals("com.captechventures.cameraxsample", appContext.packageName) 23 | } 24 | } 25 | -------------------------------------------------------------------------------- /app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 5 | 6 | 7 | 14 | 15 | 18 | 19 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | -------------------------------------------------------------------------------- /app/src/main/java/com/captechventures/cameraxsample/AutoFitPreviewBuilder.kt: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2019 Google LLC 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * https://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | 17 | package com.captechventures.cameraxsample 18 | 19 | import android.content.Context 20 | import android.graphics.Matrix 21 | import android.hardware.display.DisplayManager 22 | import android.util.Log 23 | import android.util.Size 24 | import android.view.* 25 | import androidx.camera.core.Preview 26 | import androidx.camera.core.PreviewConfig 27 | import java.lang.ref.WeakReference 28 | import java.util.* 29 | 30 | /** 31 | * Builder for [Preview] that takes in a [WeakReference] of the view finder and 32 | * [PreviewConfig], then instantiates a [Preview] which automatically 33 | * resizes and rotates reacting to config changes. 34 | * 35 | * 36 | * Taken from Google's CameraXBasic repo https://github.com/android/camera/tree/master/CameraXBasic 37 | */ 38 | class AutoFitPreviewBuilder private constructor(config: PreviewConfig, 39 | viewFinderRef: WeakReference) { 40 | /** Public instance of preview use-case which can be used by consumers of this adapter */ 41 | val useCase: Preview 42 | 43 | /** Internal variable used to keep track of the use-case's output rotation */ 44 | private var bufferRotation: Int = 0 45 | /** Internal variable used to keep track of the view's rotation */ 46 | private var viewFinderRotation: Int? = null 47 | /** Internal variable used to keep track of the use-case's output dimension */ 48 | private var bufferDimens: Size = Size(0, 0) 49 | /** Internal variable used to keep track of the view's dimension */ 50 | private var viewFinderDimens: Size = Size(0, 0) 51 | /** Internal variable used to keep track of the view's display */ 52 | private var viewFinderDisplay: Int = -1 53 | 54 | private lateinit var displayManager: DisplayManager 55 | /** We need a display listener for 180 degree device orientation changes */ 56 | private val displayListener = object : DisplayManager.DisplayListener { 57 | override fun onDisplayAdded(displayId: Int) = Unit 58 | override fun onDisplayRemoved(displayId: Int) = Unit 59 | override fun onDisplayChanged(displayId: Int) { 60 | val viewFinder = viewFinderRef.get() ?: return 61 | if (displayId != viewFinderDisplay) { 62 | val display = displayManager.getDisplay(displayId) 63 | val rotation = getDisplaySurfaceRotation(display) 64 | updateTransform(viewFinder, rotation, bufferDimens, viewFinderDimens) 65 | } 66 | } 67 | } 68 | 69 | init { 70 | // Make sure that the view finder reference is valid 71 | val viewFinder = viewFinderRef.get() ?: throw IllegalArgumentException( 72 | "Invalid reference to view finder used") 73 | 74 | // Initialize the display and rotation from texture view information 75 | viewFinderDisplay = viewFinder.display.displayId 76 | viewFinderRotation = getDisplaySurfaceRotation(viewFinder.display) ?: 0 77 | 78 | // Initialize public use-case with the given config 79 | useCase = Preview(config) 80 | 81 | // Every time the view finder is updated, recompute layout 82 | useCase.onPreviewOutputUpdateListener = Preview.OnPreviewOutputUpdateListener { 83 | val finder = 84 | viewFinderRef.get() ?: return@OnPreviewOutputUpdateListener 85 | 86 | // To update the SurfaceTexture, we have to remove it and re-add it 87 | val parent = finder.parent as ViewGroup 88 | parent.removeView(finder) 89 | parent.addView(finder, 0) 90 | finder.surfaceTexture = it.surfaceTexture 91 | bufferRotation = it.rotationDegrees 92 | val rotation = getDisplaySurfaceRotation(viewFinder.display) 93 | updateTransform(viewFinder, rotation, it.textureSize, viewFinderDimens) 94 | } 95 | 96 | // Every time the provided texture view changes, recompute layout 97 | viewFinder.addOnLayoutChangeListener { view, left, top, right, bottom, _, _, _, _ -> 98 | val finder = view as TextureView 99 | val newViewFinderDimens = Size(right - left, bottom - top) 100 | val rotation = getDisplaySurfaceRotation(finder.display) 101 | updateTransform(finder, rotation, bufferDimens, newViewFinderDimens) 102 | } 103 | 104 | // Every time the orientation of device changes, recompute layout 105 | displayManager = viewFinder.context 106 | .getSystemService(Context.DISPLAY_SERVICE) as DisplayManager 107 | displayManager.registerDisplayListener(displayListener, null) 108 | 109 | // // Remove the display listeners when the view is detached to avoid 110 | // // holding a reference to the View outside of a Fragment. 111 | // // NOTE: Even though using a weak reference should take care of this, 112 | // // we still try to avoid unnecessary calls to the listener this way. 113 | viewFinder.addOnAttachStateChangeListener(object : View.OnAttachStateChangeListener { 114 | override fun onViewAttachedToWindow(view: View?) = Unit 115 | override fun onViewDetachedFromWindow(view: View?) { 116 | displayManager.unregisterDisplayListener(displayListener) 117 | } 118 | 119 | }) 120 | } 121 | 122 | private fun updateTransform(viewFinder: TextureView) { 123 | val matrix = Matrix() 124 | 125 | // Compute the center of the view finder 126 | val centerX = viewFinder.width / 2f 127 | val centerY = viewFinder.height / 2f 128 | 129 | // Correct preview output to account for display rotation 130 | val rotationDegrees = getDisplaySurfaceRotation(viewFinder.display) ?: 0 131 | matrix.postRotate(-rotationDegrees.toFloat(), centerX, centerY) 132 | 133 | // Finally, apply transformations to our TextureView 134 | viewFinder.setTransform(matrix) 135 | } 136 | 137 | /** Helper function that fits a camera preview into the given [TextureView] */ 138 | private fun updateTransform(textureView: TextureView?, rotation: Int?, newBufferDimens: Size, 139 | newViewFinderDimens: Size) { 140 | // This should happen anyway, but now the linter knows 141 | Log.d("DEBUG_TAG", "checking textureview: $textureView") 142 | val view = textureView ?: return 143 | 144 | if (rotation == viewFinderRotation && 145 | Objects.equals(newBufferDimens, bufferDimens) && 146 | Objects.equals(newViewFinderDimens, viewFinderDimens)) { 147 | // Nothing has changed, no need to transform output again 148 | Log.d("DEBUG_TAG", "nothing changed?") 149 | return 150 | } 151 | 152 | if (rotation == null) { 153 | // Invalid rotation - wait for valid inputs before setting matrix 154 | Log.d("DEBUG_TAG", "wat") 155 | return 156 | } else { 157 | // Update internal field with new inputs 158 | viewFinderRotation = rotation 159 | } 160 | 161 | if (newBufferDimens.width == 0 || newBufferDimens.height == 0) { 162 | // Invalid buffer dimens - wait for valid inputs before setting matrix 163 | Log.d("DEBUG_TAG", "invalid buffer dimens?") 164 | return 165 | } else { 166 | // Update internal field with new inputs 167 | bufferDimens = newBufferDimens 168 | } 169 | 170 | if (newViewFinderDimens.width == 0 || newViewFinderDimens.height == 0) { 171 | Log.d("DEBUG_TAG", "invalid view finder dimens?") 172 | // Invalid view finder dimens - wait for valid inputs before setting matrix 173 | return 174 | } else { 175 | // Update internal field with new inputs 176 | viewFinderDimens = newViewFinderDimens 177 | } 178 | 179 | val matrix = Matrix() 180 | 181 | // Compute the center of the view finder 182 | val centerX = viewFinderDimens.width / 2f 183 | val centerY = viewFinderDimens.height / 2f 184 | 185 | // Correct preview output to account for display rotation 186 | matrix.postRotate(-viewFinderRotation!!.toFloat(), centerX, centerY) 187 | 188 | // Buffers are rotated relative to the device's 'natural' orientation: swap width and height 189 | val bufferRatio = bufferDimens.height / bufferDimens.width.toFloat() 190 | 191 | val scaledWidth: Int 192 | val scaledHeight: Int 193 | // Match longest sides together -- i.e. apply center-crop transformation 194 | if (viewFinderDimens.width > viewFinderDimens.height) { 195 | scaledHeight = viewFinderDimens.width 196 | scaledWidth = Math.round(viewFinderDimens.width * bufferRatio) 197 | } else { 198 | scaledHeight = viewFinderDimens.height 199 | scaledWidth = Math.round(viewFinderDimens.height * bufferRatio) 200 | } 201 | 202 | // Compute the relative scale value 203 | val xScale = scaledWidth / viewFinderDimens.width.toFloat() 204 | val yScale = scaledHeight / viewFinderDimens.height.toFloat() 205 | 206 | // Scale input buffers to fill the view finder 207 | matrix.preScale(xScale, yScale, centerX, centerY) 208 | Log.d("DEBUG_TAG", "setting transform") 209 | // Finally, apply transformations to our TextureView 210 | view.setTransform(matrix) 211 | } 212 | 213 | companion object { 214 | /** Helper function that gets the rotation of a [Display] in degrees */ 215 | fun getDisplaySurfaceRotation(display: Display?) = when(display?.rotation) { 216 | Surface.ROTATION_0 -> 0 217 | Surface.ROTATION_90 -> 90 218 | Surface.ROTATION_180 -> 180 219 | Surface.ROTATION_270 -> 270 220 | else -> null 221 | } 222 | 223 | /** 224 | * Main entrypoint for users of this class: instantiates the adapter and returns an instance 225 | * of [Preview] which automatically adjusts in size and rotation to compensate for 226 | * config changes. 227 | */ 228 | fun build(config: PreviewConfig, viewFinder: TextureView) = 229 | AutoFitPreviewBuilder(config, WeakReference(viewFinder)).useCase 230 | } 231 | } -------------------------------------------------------------------------------- /app/src/main/java/com/captechventures/cameraxsample/CameraFragment.kt: -------------------------------------------------------------------------------- 1 | package com.captechventures.cameraxsample 2 | 3 | import android.Manifest 4 | import android.content.pm.PackageManager 5 | import android.os.Bundle 6 | import android.os.Handler 7 | import android.os.HandlerThread 8 | import android.util.* 9 | import android.view.LayoutInflater 10 | import android.view.View 11 | import android.view.ViewGroup 12 | import android.widget.Toast 13 | import androidx.camera.core.* 14 | import androidx.core.content.ContextCompat 15 | import androidx.fragment.app.Fragment 16 | import androidx.fragment.app.transaction 17 | import com.google.firebase.ml.vision.FirebaseVision 18 | import com.google.firebase.ml.vision.common.FirebaseVisionImage 19 | import com.google.firebase.ml.vision.common.FirebaseVisionImageMetadata 20 | import com.google.firebase.ml.vision.text.FirebaseVisionText 21 | import kotlinx.android.synthetic.main.fragment_camera.* 22 | import java.io.File 23 | import java.util.concurrent.TimeUnit 24 | 25 | const val TAG = "CameraXSample" 26 | 27 | class CameraFragment : Fragment() { 28 | 29 | private var imageCapture: ImageCapture? = null 30 | 31 | private val cameraPermissionGranted 32 | get() = ContextCompat.checkSelfPermission( 33 | requireContext(), Manifest.permission.CAMERA 34 | ) == PackageManager.PERMISSION_GRANTED 35 | 36 | private var phrase = "" 37 | 38 | 39 | // listener for after an image is captured 40 | private val imageCaptureListener = object : ImageCapture.OnImageSavedListener { 41 | override fun onError(error: ImageCapture.UseCaseError, message: String, exc: Throwable?) { 42 | Log.e(TAG, "Photo capture failed: $message", exc) 43 | } 44 | 45 | override fun onImageSaved(photoFile: File) { 46 | Log.d(TAG, "Photo capture succeeded: ${photoFile.absolutePath}") 47 | requireFragmentManager().transaction { 48 | replace(R.id.fragmentContainer, PhotoFragment.newInstance(photoFile.absolutePath)) 49 | addToBackStack(null) 50 | } 51 | } 52 | } 53 | 54 | override fun onCreate(savedInstanceState: Bundle?) { 55 | super.onCreate(savedInstanceState) 56 | 57 | phrase = requireArguments().getString(PHRASE_ARG, "") 58 | } 59 | 60 | override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? { 61 | return inflater.inflate(R.layout.fragment_camera, container, false) 62 | } 63 | 64 | override fun onViewCreated(view: View, savedInstanceState: Bundle?) { 65 | super.onViewCreated(view, savedInstanceState) 66 | 67 | if (cameraPermissionGranted) { 68 | surfacePreview.post { startCamera() } 69 | } else { 70 | requestPermissions(arrayOf(Manifest.permission.CAMERA), PERMISSION_CODE) 71 | } 72 | 73 | Toast.makeText(requireContext(), "Point camera at text containing the phrase: $phrase", Toast.LENGTH_LONG) 74 | .show() 75 | } 76 | 77 | override fun onRequestPermissionsResult(requestCode: Int, permissions: Array, grantResults: IntArray) { 78 | super.onRequestPermissionsResult(requestCode, permissions, grantResults) 79 | if (requestCode == PERMISSION_CODE) { 80 | if (cameraPermissionGranted) { 81 | // permission granted start camera 82 | surfacePreview.post { startCamera() } 83 | } else { 84 | Toast.makeText(requireContext(), "Permission denied, closing.", Toast.LENGTH_LONG).show() 85 | requireActivity().finish() 86 | } 87 | } 88 | } 89 | 90 | override fun onDestroyView() { 91 | super.onDestroyView() 92 | CameraX.unbindAll() 93 | } 94 | 95 | private fun startCamera() { 96 | // unbind anything that still might be open 97 | CameraX.unbindAll() 98 | 99 | val metrics = DisplayMetrics().also { surfacePreview.display.getRealMetrics(it) } 100 | val screenSize = Size(metrics.widthPixels, metrics.heightPixels) 101 | val screenAspectRatio = Rational(metrics.widthPixels, metrics.heightPixels) 102 | 103 | val previewConfig = PreviewConfig.Builder() 104 | .setLensFacing(CameraX.LensFacing.BACK) 105 | .setTargetAspectRatio(screenAspectRatio) 106 | .setTargetResolution(screenSize) 107 | .build() 108 | 109 | // Build the viewfinder use case 110 | val preview = AutoFitPreviewBuilder.build(previewConfig, surfacePreview) 111 | 112 | val analyzerConfig = ImageAnalysisConfig.Builder().apply { 113 | setLensFacing(CameraX.LensFacing.BACK) 114 | val analyzerThread = HandlerThread("OCR").apply { start() } 115 | setCallbackHandler(Handler(analyzerThread.looper)) 116 | setImageReaderMode(ImageAnalysis.ImageReaderMode.ACQUIRE_LATEST_IMAGE) 117 | setTargetResolution(Size(1280, 720)) 118 | }.build() 119 | 120 | val captureConfig = ImageCaptureConfig.Builder() 121 | .setLensFacing(CameraX.LensFacing.BACK) 122 | .setCaptureMode(ImageCapture.CaptureMode.MIN_LATENCY) 123 | .setTargetRotation(surfacePreview.display.rotation) 124 | .setTargetAspectRatio(screenAspectRatio) 125 | .build() 126 | 127 | imageCapture = ImageCapture(captureConfig) 128 | 129 | 130 | val imageAnalysis = ImageAnalysis(analyzerConfig) 131 | imageAnalysis.analyzer = TextAnalyzer(phrase) { 132 | val outputDirectory: File = requireContext().filesDir 133 | val photoFile = File(outputDirectory, "${System.currentTimeMillis()}.jpg") 134 | imageCapture?.takePicture(photoFile, imageCaptureListener, ImageCapture.Metadata()) 135 | 136 | } 137 | 138 | CameraX.bindToLifecycle(this, preview, imageAnalysis, imageCapture) 139 | } 140 | 141 | 142 | companion object { 143 | 144 | private const val PERMISSION_CODE = 15 145 | private const val PHRASE_ARG = "phrase_arg" 146 | 147 | @JvmStatic 148 | fun newInstance(phrase: String): CameraFragment { 149 | return CameraFragment().apply { 150 | arguments = Bundle().apply { putString(PHRASE_ARG, phrase) } 151 | } 152 | } 153 | 154 | } 155 | } 156 | 157 | class TextAnalyzer( 158 | private val identifier: String, 159 | private val identifierDetectedCallback: () -> Unit 160 | ) : ImageAnalysis.Analyzer { 161 | 162 | companion object { 163 | private val ORIENTATIONS = SparseIntArray() 164 | 165 | init { 166 | ORIENTATIONS.append(0, FirebaseVisionImageMetadata.ROTATION_0) 167 | ORIENTATIONS.append(90, FirebaseVisionImageMetadata.ROTATION_90) 168 | ORIENTATIONS.append(180, FirebaseVisionImageMetadata.ROTATION_180) 169 | ORIENTATIONS.append(270, FirebaseVisionImageMetadata.ROTATION_270) 170 | } 171 | } 172 | 173 | private var lastAnalyzedTimestamp = 0L 174 | 175 | 176 | private fun getOrientationFromRotation(rotationDegrees: Int): Int { 177 | return when (rotationDegrees) { 178 | 0 -> FirebaseVisionImageMetadata.ROTATION_0 179 | 90 -> FirebaseVisionImageMetadata.ROTATION_90 180 | 180 -> FirebaseVisionImageMetadata.ROTATION_180 181 | 270 -> FirebaseVisionImageMetadata.ROTATION_270 182 | else -> FirebaseVisionImageMetadata.ROTATION_90 183 | } 184 | } 185 | 186 | override fun analyze(image: ImageProxy?, rotationDegrees: Int) { 187 | if (image?.image == null || image.image == null) return 188 | 189 | val timestamp = System.currentTimeMillis() 190 | // only run once per second 191 | if (timestamp - lastAnalyzedTimestamp >= TimeUnit.SECONDS.toMillis(1)) { 192 | val visionImage = FirebaseVisionImage.fromMediaImage( 193 | image.image!!, 194 | getOrientationFromRotation(rotationDegrees) 195 | ) 196 | 197 | val detector = FirebaseVision.getInstance() 198 | .onDeviceTextRecognizer 199 | 200 | detector.processImage(visionImage) 201 | .addOnSuccessListener { result: FirebaseVisionText -> 202 | // remove the new lines and join to a single string, 203 | // then search for our identifier 204 | val textToSearch = result.text.split("\n").joinToString(" ") 205 | if (textToSearch.contains(identifier, true)) { 206 | identifierDetectedCallback() 207 | } 208 | } 209 | .addOnFailureListener { 210 | Log.e(TAG, "Error processing image", it) 211 | } 212 | lastAnalyzedTimestamp = timestamp 213 | } 214 | } 215 | 216 | } -------------------------------------------------------------------------------- /app/src/main/java/com/captechventures/cameraxsample/MainActivity.kt: -------------------------------------------------------------------------------- 1 | package com.captechventures.cameraxsample 2 | 3 | import android.os.Bundle 4 | import android.view.View 5 | import androidx.appcompat.app.AppCompatActivity 6 | import androidx.fragment.app.transaction 7 | import kotlinx.android.synthetic.main.activity_main.* 8 | 9 | class MainActivity : AppCompatActivity() { 10 | 11 | override fun onCreate(savedInstanceState: Bundle?) { 12 | super.onCreate(savedInstanceState) 13 | setContentView(R.layout.activity_main) 14 | 15 | if (savedInstanceState == null) { 16 | supportFragmentManager.transaction { 17 | add(R.id.fragmentContainer, PhraseEntryFragment.newInstance()) 18 | } 19 | } 20 | } 21 | 22 | override fun onResume() { 23 | super.onResume() 24 | 25 | // go to full screen 26 | fragmentContainer.postDelayed({ 27 | fragmentContainer.systemUiVisibility = 28 | View.SYSTEM_UI_FLAG_LOW_PROFILE or 29 | View.SYSTEM_UI_FLAG_FULLSCREEN or 30 | View.SYSTEM_UI_FLAG_LAYOUT_STABLE or 31 | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY or 32 | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION or 33 | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION 34 | }, 500) 35 | } 36 | } -------------------------------------------------------------------------------- /app/src/main/java/com/captechventures/cameraxsample/PhotoFragment.kt: -------------------------------------------------------------------------------- 1 | package com.captechventures.cameraxsample 2 | 3 | import android.os.Bundle 4 | import android.view.LayoutInflater 5 | import android.view.View 6 | import android.view.ViewGroup 7 | import android.widget.Toast 8 | import androidx.fragment.app.Fragment 9 | import com.bumptech.glide.Glide 10 | import kotlinx.android.synthetic.main.fragment_photo.* 11 | 12 | class PhotoFragment : Fragment() { 13 | 14 | companion object { 15 | private const val FILE_ARG = "file_arg" 16 | 17 | @JvmStatic 18 | fun newInstance(fileLocation: String): PhotoFragment { 19 | return PhotoFragment().apply { 20 | arguments = Bundle().apply { 21 | putString(FILE_ARG, fileLocation) 22 | } 23 | } 24 | } 25 | } 26 | 27 | override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? { 28 | return inflater.inflate(R.layout.fragment_photo, container, false) 29 | } 30 | 31 | override fun onViewCreated(view: View, savedInstanceState: Bundle?) { 32 | super.onViewCreated(view, savedInstanceState) 33 | backButton.setOnClickListener { requireFragmentManager().popBackStack() } 34 | 35 | val fileLocation = requireArguments().getString(FILE_ARG) 36 | Glide.with(this).load(fileLocation).fitCenter().into(image) 37 | 38 | if (savedInstanceState == null) { 39 | Toast.makeText(requireContext(), "Phrase found, image captured!", Toast.LENGTH_SHORT).show() 40 | } 41 | } 42 | } -------------------------------------------------------------------------------- /app/src/main/java/com/captechventures/cameraxsample/PhraseEntryFragment.kt: -------------------------------------------------------------------------------- 1 | package com.captechventures.cameraxsample 2 | 3 | import android.os.Bundle 4 | import android.view.LayoutInflater 5 | import android.view.View 6 | import android.view.ViewGroup 7 | import android.view.inputmethod.EditorInfo 8 | import androidx.core.widget.doAfterTextChanged 9 | import androidx.fragment.app.Fragment 10 | import androidx.fragment.app.transaction 11 | import kotlinx.android.synthetic.main.fragment_phrase_entry.* 12 | 13 | class PhraseEntryFragment : Fragment() { 14 | 15 | companion object { 16 | @JvmStatic 17 | fun newInstance() = PhraseEntryFragment() 18 | } 19 | 20 | override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? { 21 | return inflater.inflate(R.layout.fragment_phrase_entry, container, false) 22 | } 23 | 24 | override fun onViewCreated(view: View, savedInstanceState: Bundle?) { 25 | super.onViewCreated(view, savedInstanceState) 26 | 27 | 28 | phraseEditText.doAfterTextChanged { text -> 29 | enterButton.isEnabled = text.toString().isNotEmpty() 30 | } 31 | 32 | phraseEditText.setOnEditorActionListener { v, actionId, event -> 33 | if (actionId == EditorInfo.IME_ACTION_DONE && enterButton.isEnabled) { 34 | enterButton.callOnClick() 35 | return@setOnEditorActionListener true 36 | } 37 | false 38 | } 39 | 40 | enterButton.setOnClickListener { 41 | requireFragmentManager().transaction { 42 | replace(R.id.fragmentContainer, CameraFragment.newInstance(phraseEditText.text.trim().toString())) 43 | addToBackStack(null) 44 | } 45 | } 46 | } 47 | } -------------------------------------------------------------------------------- /app/src/main/res/drawable-v24/ic_launcher_foreground.xml: -------------------------------------------------------------------------------- 1 | 7 | 12 | 13 | 19 | 22 | 25 | 26 | 27 | 28 | 34 | 35 | -------------------------------------------------------------------------------- /app/src/main/res/drawable/ic_arrow_back.xml: -------------------------------------------------------------------------------- 1 | 4 | 5 | 6 | -------------------------------------------------------------------------------- /app/src/main/res/drawable/ic_launcher_background.xml: -------------------------------------------------------------------------------- 1 | 2 | 7 | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 | 65 | 70 | 75 | 80 | 85 | 90 | 95 | 100 | 105 | 110 | 115 | 120 | 125 | 130 | 135 | 140 | 145 | 150 | 155 | 160 | 165 | 170 | 171 | -------------------------------------------------------------------------------- /app/src/main/res/drawable/ic_photo_camera.xml: -------------------------------------------------------------------------------- 1 | 4 | 5 | 6 | 7 | -------------------------------------------------------------------------------- /app/src/main/res/layout/activity_main.xml: -------------------------------------------------------------------------------- 1 | 2 | -------------------------------------------------------------------------------- /app/src/main/res/layout/fragment_camera.xml: -------------------------------------------------------------------------------- 1 | 2 | 8 | 9 | 17 | 18 | -------------------------------------------------------------------------------- /app/src/main/res/layout/fragment_photo.xml: -------------------------------------------------------------------------------- 1 | 2 | 8 | 9 | 17 | 18 | 26 | 27 | -------------------------------------------------------------------------------- /app/src/main/res/layout/fragment_phrase_entry.xml: -------------------------------------------------------------------------------- 1 | 2 | 8 | 9 | 25 | 26 | 43 | 44 |