11 |
12 |
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/README.md:
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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 | 
9 |
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/app/.gitignore:
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1 | /build
2 | google-services.json
3 |
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/app/build.gradle:
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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'
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/app/proguard-rules.pro:
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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 |
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/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 |
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/app/src/main/AndroidManifest.xml:
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1 |
2 |
4 |
5 |
6 |
7 |
14 |
15 |
18 |
19 |
23 |
24 |
25 |
26 |
27 |
28 |
29 |
30 |
31 |
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/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 | }
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/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 | }
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/app/src/main/java/com/captechventures/cameraxsample/MainActivity.kt:
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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 | }
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/app/src/main/java/com/captechventures/cameraxsample/PhotoFragment.kt:
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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 | }
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/app/src/main/java/com/captechventures/cameraxsample/PhraseEntryFragment.kt:
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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 | }
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/app/src/main/res/drawable-v24/ic_launcher_foreground.xml:
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/app/src/main/res/values/colors.xml:
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2 |
3 | #008577
4 | #00574B
5 | #D81B60
6 |
7 |
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/app/src/main/res/values/dimens.xml:
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2 | 16dp
3 |
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/app/src/main/res/values/strings.xml:
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1 |
2 | CameraX Sample
3 | Settings
4 |
5 |
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/app/src/main/res/values/styles.xml:
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/app/src/test/java/com/captechventures/cameraxsample/ExampleUnitTest.kt:
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1 | package com.captechventures.cameraxsample
2 |
3 | import org.junit.Test
4 |
5 | import org.junit.Assert.*
6 |
7 | /**
8 | * Example local unit test, which will execute on the development machine (host).
9 | *
10 | * See [testing documentation](http://d.android.com/tools/testing).
11 | */
12 | class ExampleUnitTest {
13 | @Test
14 | fun addition_isCorrect() {
15 | assertEquals(4, 2 + 2)
16 | }
17 | }
18 |
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/build.gradle:
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1 | // Top-level build file where you can add configuration options common to all sub-projects/modules.
2 |
3 | buildscript {
4 | ext.kotlin_version = '1.3.31'
5 | repositories {
6 | google()
7 | jcenter()
8 |
9 | }
10 | dependencies {
11 | classpath 'com.android.tools.build:gradle:3.4.1'
12 | classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
13 | classpath 'com.google.gms:google-services:4.2.0'
14 | // NOTE: Do not place your application dependencies here; they belong
15 | // in the individual module build.gradle files
16 | }
17 | }
18 |
19 | allprojects {
20 | repositories {
21 | google()
22 | jcenter()
23 |
24 | }
25 | }
26 |
27 | task clean(type: Delete) {
28 | delete rootProject.buildDir
29 | }
30 |
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/demo.gif:
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/gradle.properties:
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1 | # Project-wide Gradle settings.
2 |
3 | # IDE (e.g. Android Studio) users:
4 | # Gradle settings configured through the IDE *will override*
5 | # any settings specified in this file.
6 |
7 | # For more details on how to configure your build environment visit
8 | # http://www.gradle.org/docs/current/userguide/build_environment.html
9 |
10 | # Specifies the JVM arguments used for the daemon process.
11 | # The setting is particularly useful for tweaking memory settings.
12 | org.gradle.jvmargs=-Xmx1536m
13 |
14 | # When configured, Gradle will run in incubating parallel mode.
15 | # This option should only be used with decoupled projects. More details, visit
16 | # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
17 | # org.gradle.parallel=true
18 |
19 | # AndroidX package structure to make it clearer which packages are bundled with the
20 | # Android operating system, and which are packaged with your app's APK
21 | # https://developer.android.com/topic/libraries/support-library/androidx-rn
22 | android.useAndroidX=true
23 | # Automatically convert third-party libraries to use AndroidX
24 | android.enableJetifier=true
25 |
26 | # Kotlin code style for this project: "official" or "obsolete":
27 | kotlin.code.style=official
28 |
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/gradle/wrapper/gradle-wrapper.jar:
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/gradle/wrapper/gradle-wrapper.properties:
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1 | #Fri May 17 17:30:38 EDT 2019
2 | distributionBase=GRADLE_USER_HOME
3 | distributionPath=wrapper/dists
4 | zipStoreBase=GRADLE_USER_HOME
5 | zipStorePath=wrapper/dists
6 | distributionUrl=https\://services.gradle.org/distributions/gradle-5.1.1-all.zip
7 |
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/gradlew:
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1 | #!/usr/bin/env sh
2 |
3 | ##############################################################################
4 | ##
5 | ## Gradle start up script for UN*X
6 | ##
7 | ##############################################################################
8 |
9 | # Attempt to set APP_HOME
10 | # Resolve links: $0 may be a link
11 | PRG="$0"
12 | # Need this for relative symlinks.
13 | while [ -h "$PRG" ] ; do
14 | ls=`ls -ld "$PRG"`
15 | link=`expr "$ls" : '.*-> \(.*\)$'`
16 | if expr "$link" : '/.*' > /dev/null; then
17 | PRG="$link"
18 | else
19 | PRG=`dirname "$PRG"`"/$link"
20 | fi
21 | done
22 | SAVED="`pwd`"
23 | cd "`dirname \"$PRG\"`/" >/dev/null
24 | APP_HOME="`pwd -P`"
25 | cd "$SAVED" >/dev/null
26 |
27 | APP_NAME="Gradle"
28 | APP_BASE_NAME=`basename "$0"`
29 |
30 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
31 | DEFAULT_JVM_OPTS=""
32 |
33 | # Use the maximum available, or set MAX_FD != -1 to use that value.
34 | MAX_FD="maximum"
35 |
36 | warn () {
37 | echo "$*"
38 | }
39 |
40 | die () {
41 | echo
42 | echo "$*"
43 | echo
44 | exit 1
45 | }
46 |
47 | # OS specific support (must be 'true' or 'false').
48 | cygwin=false
49 | msys=false
50 | darwin=false
51 | nonstop=false
52 | case "`uname`" in
53 | CYGWIN* )
54 | cygwin=true
55 | ;;
56 | Darwin* )
57 | darwin=true
58 | ;;
59 | MINGW* )
60 | msys=true
61 | ;;
62 | NONSTOP* )
63 | nonstop=true
64 | ;;
65 | esac
66 |
67 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
68 |
69 | # Determine the Java command to use to start the JVM.
70 | if [ -n "$JAVA_HOME" ] ; then
71 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
72 | # IBM's JDK on AIX uses strange locations for the executables
73 | JAVACMD="$JAVA_HOME/jre/sh/java"
74 | else
75 | JAVACMD="$JAVA_HOME/bin/java"
76 | fi
77 | if [ ! -x "$JAVACMD" ] ; then
78 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
79 |
80 | Please set the JAVA_HOME variable in your environment to match the
81 | location of your Java installation."
82 | fi
83 | else
84 | JAVACMD="java"
85 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
86 |
87 | Please set the JAVA_HOME variable in your environment to match the
88 | location of your Java installation."
89 | fi
90 |
91 | # Increase the maximum file descriptors if we can.
92 | if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
93 | MAX_FD_LIMIT=`ulimit -H -n`
94 | if [ $? -eq 0 ] ; then
95 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
96 | MAX_FD="$MAX_FD_LIMIT"
97 | fi
98 | ulimit -n $MAX_FD
99 | if [ $? -ne 0 ] ; then
100 | warn "Could not set maximum file descriptor limit: $MAX_FD"
101 | fi
102 | else
103 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
104 | fi
105 | fi
106 |
107 | # For Darwin, add options to specify how the application appears in the dock
108 | if $darwin; then
109 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
110 | fi
111 |
112 | # For Cygwin, switch paths to Windows format before running java
113 | if $cygwin ; then
114 | APP_HOME=`cygpath --path --mixed "$APP_HOME"`
115 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
116 | JAVACMD=`cygpath --unix "$JAVACMD"`
117 |
118 | # We build the pattern for arguments to be converted via cygpath
119 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
120 | SEP=""
121 | for dir in $ROOTDIRSRAW ; do
122 | ROOTDIRS="$ROOTDIRS$SEP$dir"
123 | SEP="|"
124 | done
125 | OURCYGPATTERN="(^($ROOTDIRS))"
126 | # Add a user-defined pattern to the cygpath arguments
127 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then
128 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
129 | fi
130 | # Now convert the arguments - kludge to limit ourselves to /bin/sh
131 | i=0
132 | for arg in "$@" ; do
133 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
134 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option
135 |
136 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition
137 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
138 | else
139 | eval `echo args$i`="\"$arg\""
140 | fi
141 | i=$((i+1))
142 | done
143 | case $i in
144 | (0) set -- ;;
145 | (1) set -- "$args0" ;;
146 | (2) set -- "$args0" "$args1" ;;
147 | (3) set -- "$args0" "$args1" "$args2" ;;
148 | (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
149 | (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
150 | (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
151 | (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
152 | (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
153 | (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
154 | esac
155 | fi
156 |
157 | # Escape application args
158 | save () {
159 | for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
160 | echo " "
161 | }
162 | APP_ARGS=$(save "$@")
163 |
164 | # Collect all arguments for the java command, following the shell quoting and substitution rules
165 | eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
166 |
167 | # by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
168 | if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
169 | cd "$(dirname "$0")"
170 | fi
171 |
172 | exec "$JAVACMD" "$@"
173 |
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/gradlew.bat:
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1 | @if "%DEBUG%" == "" @echo off
2 | @rem ##########################################################################
3 | @rem
4 | @rem Gradle startup script for Windows
5 | @rem
6 | @rem ##########################################################################
7 |
8 | @rem Set local scope for the variables with windows NT shell
9 | if "%OS%"=="Windows_NT" setlocal
10 |
11 | set DIRNAME=%~dp0
12 | if "%DIRNAME%" == "" set DIRNAME=.
13 | set APP_BASE_NAME=%~n0
14 | set APP_HOME=%DIRNAME%
15 |
16 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
17 | set DEFAULT_JVM_OPTS=
18 |
19 | @rem Find java.exe
20 | if defined JAVA_HOME goto findJavaFromJavaHome
21 |
22 | set JAVA_EXE=java.exe
23 | %JAVA_EXE% -version >NUL 2>&1
24 | if "%ERRORLEVEL%" == "0" goto init
25 |
26 | echo.
27 | echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
28 | echo.
29 | echo Please set the JAVA_HOME variable in your environment to match the
30 | echo location of your Java installation.
31 |
32 | goto fail
33 |
34 | :findJavaFromJavaHome
35 | set JAVA_HOME=%JAVA_HOME:"=%
36 | set JAVA_EXE=%JAVA_HOME%/bin/java.exe
37 |
38 | if exist "%JAVA_EXE%" goto init
39 |
40 | echo.
41 | echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
42 | echo.
43 | echo Please set the JAVA_HOME variable in your environment to match the
44 | echo location of your Java installation.
45 |
46 | goto fail
47 |
48 | :init
49 | @rem Get command-line arguments, handling Windows variants
50 |
51 | if not "%OS%" == "Windows_NT" goto win9xME_args
52 |
53 | :win9xME_args
54 | @rem Slurp the command line arguments.
55 | set CMD_LINE_ARGS=
56 | set _SKIP=2
57 |
58 | :win9xME_args_slurp
59 | if "x%~1" == "x" goto execute
60 |
61 | set CMD_LINE_ARGS=%*
62 |
63 | :execute
64 | @rem Setup the command line
65 |
66 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
67 |
68 | @rem Execute Gradle
69 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
70 |
71 | :end
72 | @rem End local scope for the variables with windows NT shell
73 | if "%ERRORLEVEL%"=="0" goto mainEnd
74 |
75 | :fail
76 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
77 | rem the _cmd.exe /c_ return code!
78 | if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
79 | exit /b 1
80 |
81 | :mainEnd
82 | if "%OS%"=="Windows_NT" endlocal
83 |
84 | :omega
85 |
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/settings.gradle:
--------------------------------------------------------------------------------
1 | include ':app'
2 |
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