Update dependencies

.github/workflows/android.yml

@@ -12,19 +12,17 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
-    - name: set up JDK 11
-      uses: actions/setup-java@v2
+    - uses: actions/checkout@v4
+    - name: set up JDK
+      uses: actions/setup-java@v4
       with:
-        java-version: '11'
-        distribution: 'adopt'
+        java-version: '21'
+        distribution: 'temurin'
         cache: gradle
 
-    - name: Grant execute permission for gradlew
-      run: chmod +x gradlew
     - name: Build with Gradle
       run: ./gradlew assembleDebug
-    - uses: actions/upload-artifact@v2
+    - uses: actions/upload-artifact@v4
       with:
         name: APK
         path: app/build/outputs/apk/debug/

.github/workflows/release_build.yml

@@ -12,18 +12,15 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
 
-    - name: set up JDK 11
-      uses: actions/setup-java@v2
+    - name: set up JDK
+      uses: actions/setup-java@v4
       with:
-        java-version: '11'
-        distribution: 'adopt'
+        java-version: '21'
+        distribution: 'temurin'
         cache: gradle
 
-    - name: grant execute permission for gradlew
-      run: chmod +x gradlew
-
     - name: Build APK with Gradle
       run: ./gradlew assembleDebug
 

README.md

@@ -1,9 +1,10 @@
-# Augmented Reality Template Matching for >= Android 4 #
+# Augmented Reality Template Matching using OpenCV 4 for Android 
 ## Approach: Sum of squared differences (SSD)
 [![Android CI](https://github.com/michaeltroger/template-matching-android/actions/workflows/android.yml/badge.svg)](https://github.com/michaeltroger/template-matching-android/actions/workflows/android.yml)
 
-Attention: This app was created in 2016. I was a beginner to Android development and Computer Vision back then.
-So don't expect a perfect code please. In 2021 I updated the project to build with the latest Android Studio (2020.3.1), updated most dependencies and converted it to Kotlin, while the business logic remained unchanged.
+Attention: This app was created in 2016. I was a beginner to Android development and Computer Vision back then. So don't expect a perfect code please. Over the years I updated the dependencies and converted it to Kotlin, while the business logic remained unchanged.
+
+Note: Originally I targeted min SDK 15 (Android 4), more architectures ("mips", "mips64", "armeabi") and OpenCV 3 with this project. Nowadays the repo uses newer versions. If you need to support older devices, then you can look back in the repo's Git history (app version 1.3 / Git tag 4)
 
 <img src="/screenshots/demo.gif" alt="Augmented Reality template matching" width="800px"/>
 Copyright of the logo: Hogeschool PXL
@@ -15,9 +16,8 @@ Copyright of the logo: Hogeschool PXL
 * More computer vision projects at https://michaeltroger.com/computervision/
 
 ### How do I get set up? ###
-* IDE: Android Studio  (tested with 2020.3.1)
+* IDE: Android Studio  (tested with 2023.3.1)
 * Android SDK
-* Dependencies: OpenCV 3 library (included) [License](/opencv-3-4-15/LICENSE)
 * Template image location: res/drawable - Image is referenced in MainActivity
 
 ### Test image ###

app/build.gradle

@@ -2,45 +2,41 @@ apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
 
 android {
-    compileSdkVersion 30
-    buildToolsVersion "30.0.3"
+    namespace "com.michaeltroger.templatematching"
+    compileSdk 34
 
     defaultConfig {
         applicationId "com.michaeltroger.templatematching"
-        minSdkVersion 15
-        targetSdkVersion 30
-        versionCode 4
-        versionName "1.3"
+        minSdkVersion 21
+        targetSdkVersion 34
+        versionCode 5
+        versionName "1.4"
     }
     buildTypes {
         release {
             minifyEnabled false
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
-    compileOptions {
-        sourceCompatibility = JavaVersion.VERSION_11
-        targetCompatibility = JavaVersion.VERSION_11
-    }
-    kotlinOptions {
-        jvmTarget = "11"
-    }
+
     splits {
         abi {
             enable true
             reset()
-            include "x86", "x86_64", "mips", "mips64", "armeabi", "armeabi-v7a", "arm64-v8a"
+            include "x86", "x86_64", "armeabi-v7a", "arm64-v8a"
             universalApk true
         }
     }
 }
 
+kotlin.jvmToolchain(java_version)
+
 dependencies {
-    implementation 'androidx.core:core-ktx:1.6.0'
-    implementation 'androidx.activity:activity-ktx:1.3.1'
-    implementation 'androidx.appcompat:appcompat:1.3.1'
-    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
-    implementation project(':opencv-3-4-15')
+    implementation 'androidx.core:core-ktx:1.12.0'
+    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
+    implementation 'androidx.activity:activity-ktx:1.8.2'
+    implementation 'androidx.appcompat:appcompat:1.6.1'
+    implementation 'org.opencv:opencv:4.9.0'
 }
 repositories {
     mavenCentral()

app/src/main/AndroidManifest.xml

@@ -1,23 +1,18 @@
 <?xml version="1.0" encoding="utf-8"?>
-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.michaeltroger.templatematching">
+<manifest xmlns:tools="http://schemas.android.com/tools"
+    xmlns:android="http://schemas.android.com/apk/res/android">
     <uses-permission android:name="android.permission.CAMERA"/>
     <uses-feature android:name="android.hardware.camera" android:required="false"/>
     <uses-feature android:name="android.hardware.camera.autofocus" android:required="false"/>
     <uses-feature android:name="android.hardware.camera.front" android:required="false"/>
     <uses-feature android:name="android.hardware.camera.front.autofocus" android:required="false"/>
-    <supports-screens android:resizeable="true"
-        android:smallScreens="true"
-        android:normalScreens="true"
-        android:largeScreens="true"
-        android:anyDensity="true" />
     <application
         android:label="@string/app_name"
-        android:theme="@android:style/Theme.NoTitleBar.Fullscreen" >
-        <activity android:name="com.michaeltroger.templatematching.MainActivity"
-            android:label="@string/app_name"
+        android:theme="@style/AppTheme.NoActionBar" >
+        <activity android:name=".MainActivity"
             android:screenOrientation="landscape"
-            android:configChanges="keyboardHidden|orientation">
+            android:exported="true"
+            tools:ignore="DiscouragedApi">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />

app/src/main/java/com/michaeltroger/templatematching/MainActivity.kt

@@ -30,66 +30,28 @@ class MainActivity : ComponentActivity(), CvCameraViewListener2 {
     /**
      * the result matrix
      */
-    var result: Mat? = null
+    private var result: Mat? = null
 
     /**
      * the camera image
      */
-    var img: Mat? = null
+    private var img: Mat? = null
 
     /**
      * the template image used for template matching
      * or for copying into the camera view
      */
-    var templ: Mat? = null
+    private var templ: Mat? = null
 
     /**
      * the crop rectangle with the size of the template image
      */
-    var rect: Rect? = null
+    private var rect: Rect? = null
 
     /**
      * selected area is the camera preview cut to the crop rectangle
      */
     var selectedArea: Mat? = null
-    private val mLoaderCallback: BaseLoaderCallback = object : BaseLoaderCallback(this) {
-        override fun onManagerConnected(status: Int) {
-            when (status) {
-                SUCCESS -> {
-                    Log.i(TAG, "OpenCV loaded successfully")
-
-                    // load the specified image from file system in bgr color
-                    var bgr: Mat? = null
-                    try {
-                        bgr = Utils.loadResource(
-                            applicationContext,
-                            TEMPLATE_IMAGE,
-                            Imgcodecs.CV_LOAD_IMAGE_COLOR
-                        )
-                    } catch (e: IOException) {
-                        e.printStackTrace()
-                    }
-
-                    // convert the image to rgba
-                    templ = Mat()
-                    Imgproc.cvtColor(bgr, templ, Imgproc.COLOR_BGR2GRAY) //Imgproc.COLOR_BGR2RGBA);
-
-                    // Imgproc.Canny(templ, templ, 50.0, 200.0);
-
-                    // init the crop rectangle, necessary for copying the image to the camera view
-                    rect = Rect(0, 0, templ!!.width(), templ!!.height())
-
-                    // init the result matrix
-                    result = Mat()
-                    img = Mat()
-                    mOpenCvCameraView!!.enableView()
-                }
-                else -> {
-                    super.onManagerConnected(status)
-                }
-            }
-        }
-    }
 
     private val requestPermissionLauncher =
         registerForActivityResult(
@@ -111,12 +73,13 @@ class MainActivity : ComponentActivity(), CvCameraViewListener2 {
         }
     }
 
-    fun onPermissionGranted() {
+    private fun onPermissionGranted() {
         if (FIXED_FRAME_SIZE) {
             mOpenCvCameraView!!.setMaxFrameSize(FRAME_SIZE_WIDTH, FRAME_SIZE_HEIGHT)
         }
         mOpenCvCameraView!!.visibility = SurfaceView.VISIBLE
         mOpenCvCameraView!!.setCvCameraViewListener(this)
+        mOpenCvCameraView!!.setCameraPermissionGranted()
     }
 
     /** Called when the activity is first created.  */
@@ -138,13 +101,35 @@ class MainActivity : ComponentActivity(), CvCameraViewListener2 {
 
     public override fun onResume() {
         super.onResume()
-        if (!OpenCVLoader.initDebug()) {
-            Log.d(TAG, "Internal OpenCV library not found. Using OpenCV Manager for initialization")
-            OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION, this, mLoaderCallback)
-        } else {
-            Log.d(TAG, "OpenCV library found inside package. Using it!")
-            mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS)
+        OpenCVLoader.initLocal()
+
+        Log.i(TAG, "OpenCV loaded successfully")
+
+        // load the specified image from file system in bgr color
+        var bgr: Mat? = null
+        try {
+            bgr = Utils.loadResource(
+                applicationContext,
+                TEMPLATE_IMAGE,
+                Imgcodecs.IMREAD_COLOR
+            )
+        } catch (e: IOException) {
+            e.printStackTrace()
         }
+
+        // convert the image to rgba
+        templ = Mat()
+        Imgproc.cvtColor(bgr, templ, Imgproc.COLOR_BGR2GRAY) //Imgproc.COLOR_BGR2RGBA);
+
+        // Imgproc.Canny(templ, templ, 50.0, 200.0);
+
+        // init the crop rectangle, necessary for copying the image to the camera view
+        rect = Rect(0, 0, templ!!.width(), templ!!.height())
+
+        // init the result matrix
+        result = Mat()
+        img = Mat()
+        mOpenCvCameraView!!.enableView()
     }
 
     public override fun onDestroy() {
@@ -208,7 +193,7 @@ class MainActivity : ComponentActivity(), CvCameraViewListener2 {
         /**
          * the template image to use
          */
-        private const val TEMPLATE_IMAGE = R.drawable.logo
+        private val TEMPLATE_IMAGE = R.drawable.logo
 
         /**
          * frame size width

app/src/main/res/layout/activity_main.xml

@@ -1,5 +1,4 @@
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools"
     xmlns:opencv="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent" >

app/src/main/res/values/strings.xml

@@ -1,4 +1,3 @@
 <resources>
     <string name="app_name">Template matching</string>
-    <string name="action_settings">Settings</string>
 </resources>

app/src/main/res/values/styles.xml

@@ -1,20 +1,9 @@
 <resources>
 
-    <!-- Base application theme. -->
-    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
-        <!-- Customize your theme here. -->
-        <item name="colorPrimary">@color/colorPrimary</item>
-        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
-        <item name="colorAccent">@color/colorAccent</item>
-    </style>
-
-    <style name="AppTheme.NoActionBar">
+    <style name="AppTheme.NoActionBar" parent="Theme.AppCompat.Light.DarkActionBar">
         <item name="windowActionBar">false</item>
         <item name="windowNoTitle">true</item>
+        <item name="android:windowFullscreen">true</item>
     </style>
 
-    <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />
-
-    <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />
-
 </resources>