Merge pull request #24910 from alexlyulkov:al/android-tests

Modified Java tests to run on Android #24910

To run the tests you need to:

1. Build OpenCV using Android pipeline. For example:
`cmake -DBUILD_TEST=ON -DANDROID=ON -DANDROID_ABI=arm64-v8a -DCMAKE_TOOLCHAIN_FILE=/usr/lib/android-sdk/ndk/25.1.8937393/build/cmake/android.toolchain.cmake -DANDROID_NDK=/usr/lib/android-sdk/ndk/25.1.8937393 -DANDROID_SDK=/usr/lib/android-sdk ../opencv`
`make`
2. Connect Android Phone
3. Run tests:
`cd android_tests`
`./gradlew tests_module:connectedAndroidTest`

Related CI pipeline: https://github.com/opencv/ci-gha-workflow/pull/138

### Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [ ] There is a reference to the original bug report and related work
- [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [x] The feature is well documented and sample code can be built with the project CMake

CMakeLists.txt

@@ -1884,7 +1884,7 @@ if(BUILD_JAVA)
     status("    JNI:"         JNI_INCLUDE_DIRS    THEN "${JNI_INCLUDE_DIRS}"                                       ELSE NO)
   endif()
   status("    Java wrappers:" HAVE_opencv_java                                                            THEN "YES (${OPENCV_JAVA_SDK_BUILD_TYPE})" ELSE NO)
-  status("    Java tests:"    BUILD_TESTS AND opencv_test_java_BINARY_DIR                                 THEN YES ELSE NO)
+  status("    Java tests:"    BUILD_TESTS AND (opencv_test_java_BINARY_DIR OR opencv_test_android_BINARY_DIR) THEN YES ELSE NO)
 endif()
 
 # ========================== Objective-C =======================

modules/java/test/android_test/.classpath

@@ -1,9 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<classpath>
-	<classpathentry kind="src" path="src"/>
-	<classpathentry kind="src" path="gen"/>
-	<classpathentry kind="con" path="com.android.ide.eclipse.adt.ANDROID_FRAMEWORK"/>
-	<classpathentry kind="con" path="org.eclipse.jdt.junit.JUNIT_CONTAINER/4"/>
-	<classpathentry kind="con" path="com.android.ide.eclipse.adt.LIBRARIES"/>
-	<classpathentry kind="output" path="bin/classes"/>
-</classpath>

modules/java/test/android_test/.project

@@ -1,33 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<projectDescription>
-	<name>OpenCV_JavaAPI_Tests</name>
-	<comment></comment>
-	<projects>
-	</projects>
-	<buildSpec>
-		<buildCommand>
-			<name>com.android.ide.eclipse.adt.ResourceManagerBuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-		<buildCommand>
-			<name>com.android.ide.eclipse.adt.PreCompilerBuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-		<buildCommand>
-			<name>org.eclipse.jdt.core.javabuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-		<buildCommand>
-			<name>com.android.ide.eclipse.adt.ApkBuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-	</buildSpec>
-	<natures>
-		<nature>com.android.ide.eclipse.adt.AndroidNature</nature>
-		<nature>org.eclipse.jdt.core.javanature</nature>
-	</natures>
-</projectDescription>

modules/java/test/android_test/AndroidManifest.xml

@@ -1,28 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
-      package="org.opencv.test"
-      android:versionCode="1"
-      android:versionName="1.0">
-
-    <uses-sdk android:minSdkVersion="8" />
-
-    <!-- We add an application tag here just so that we can indicate that
-         this package needs to link against the android.test library,
-         which is needed when building test cases. -->
-    <application>
-        <uses-library android:name="android.test.runner" />
-    </application>
-    <!--
-    This declares that this application uses the instrumentation test runner targeting
-    the package of org.opencv.  To run the tests use the command:
-    "adb shell am instrument -w org.opencv.test/android.test.InstrumentationTestRunner"
-    -->
-    <instrumentation android:name="org.opencv.test.OpenCVTestRunner"
-                     android:targetPackage="org.opencv.test"
-                     android:label="Tests for org.opencv"/>
-
-    <uses-permission android:name="android.permission.CAMERA"/>
-    <uses-feature android:name="android.hardware.camera" />
-    <uses-feature android:name="android.hardware.camera.autofocus" />
-    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
-</manifest>

modules/java/test/android_test/CMakeLists.txt

@@ -1,77 +1,24 @@
-if(NOT ANT_EXECUTABLE OR NOT ANDROID_EXECUTABLE OR NOT ANDROID_TOOLS_Pkg_Revision GREATER 13)
-  return()
-endif()
+project(opencv_test_android)
 
-project(opencv_test_java)
+set(OPENCV_ANDROID_TEST_DIR "${OpenCV_BINARY_DIR}/android_test" CACHE INTERNAL "")
+file(REMOVE_RECURSE "${OPENCV_ANDROID_TEST_DIR}")
 
-set(OPENCV_JAVA_TEST_DIR "${OpenCV_BINARY_DIR}/android_test" CACHE INTERNAL "")
-file(REMOVE_RECURSE "${OPENCV_JAVA_TEST_DIR}")
-file(REMOVE "${OPENCV_DEPHELPER}/${the_module}_test_source_copy")
+set(ANDROID_TESTS_SRC_DIRS
+"'${CMAKE_CURRENT_SOURCE_DIR}/src', \
+'${OpenCV_SOURCE_DIR}/modules/java/test/common_test/src', \
+'${CMAKE_BINARY_DIR}/modules/java_bindings_generator/gen/test'" CACHE INTERNAL "")
 
-set(test_dir "${CMAKE_CURRENT_SOURCE_DIR}")
+set(ANDROID_TESTS_RES_DIR "'${OpenCV_SOURCE_DIR}/modules/java/test/common_test/res'" CACHE INTERNAL "")
 
-set(depends "")
-
-# 1. gather and copy common test files (resources, utils, etc.)
-copy_common_tests("${CMAKE_CURRENT_SOURCE_DIR}/../common_test" "${OPENCV_JAVA_TEST_DIR}" depends)
-
-# 2. gather and copy tests from each module
-ocv_copyfiles_append_dir(JAVA_TEST_SRC_COPY "${OPENCV_JAVA_BINDINGS_DIR}/gen/test" "${OPENCV_JAVA_TEST_DIR}/src")
-
-list(APPEND depends gen_opencv_java_source "${OPENCV_DEPHELPER}/gen_opencv_java_source")
-ocv_copyfiles_add_target(${the_module}_test_source_copy JAVA_TEST_SRC_COPY "Copy Java(Android test) source files" ${depends})
-set(depends ${the_module}_test_source_copy "${OPENCV_DEPHELPER}/${the_module}_test_source_copy")
-
-# 3. gather and copy specific files for Android
-file(GLOB_RECURSE test_files RELATIVE "${test_dir}" "${test_dir}/res/*" "${test_dir}/src/*")
-foreach(f ${test_files} ${ANDROID_MANIFEST_FILE} ".classpath" ".project")
-  add_custom_command(
-      OUTPUT "${OPENCV_JAVA_TEST_DIR}/${f}"
-      COMMAND ${CMAKE_COMMAND} -E copy_if_different "${test_dir}/${f}" "${OPENCV_JAVA_TEST_DIR}/${f}"
-      MAIN_DEPENDENCY "${test_dir}/${f}"
-      COMMENT "Copying ${f}")
-  list(APPEND depends "${test_dir}/${f}" "${OPENCV_JAVA_TEST_DIR}/${f}")
+list(APPEND TEST_PROJECT_FILES "build.gradle" "CMakeLists.txt" "gradle.properties" "settings.gradle")
+foreach(TEST_PROJECT_FILE ${TEST_PROJECT_FILES})
+    file(COPY "${CMAKE_CURRENT_SOURCE_DIR}/${TEST_PROJECT_FILE}" DESTINATION "${OPENCV_ANDROID_TEST_DIR}")
 endforeach()
+file(COPY "${CMAKE_CURRENT_SOURCE_DIR}/tests_module/AndroidManifest.xml" DESTINATION "${OPENCV_ANDROID_TEST_DIR}/tests_module")
+configure_file("${CMAKE_CURRENT_SOURCE_DIR}/tests_module/build.gradle.in" "${OPENCV_ANDROID_TEST_DIR}/tests_module/build.gradle" @ONLY)
 
-# fix Android project
-set(android_proj_target_files ${ANDROID_PROJECT_FILES})
-ocv_list_add_prefix(android_proj_target_files "${OPENCV_JAVA_TEST_DIR}/")
-file(RELATIVE_PATH __dep "${OPENCV_JAVA_TEST_DIR}" "${OpenCV_BINARY_DIR}/android_sdk")
+file(COPY "${OpenCV_SOURCE_DIR}/platforms/android/gradle-wrapper/gradlew" DESTINATION "${OPENCV_ANDROID_TEST_DIR}")
+file(COPY "${OpenCV_SOURCE_DIR}/platforms/android/gradle-wrapper/gradlew.bat" DESTINATION "${OPENCV_ANDROID_TEST_DIR}")
+file(COPY "${OpenCV_SOURCE_DIR}/platforms/android/gradle-wrapper/gradle/wrapper/gradle-wrapper.jar" DESTINATION "${OPENCV_ANDROID_TEST_DIR}/gradle/wrapper")
 
-add_custom_command(
-    OUTPUT ${android_proj_target_files}
-    COMMAND ${CMAKE_COMMAND} -E remove ${android_proj_target_files}
-    COMMAND ${ANDROID_EXECUTABLE} --silent update test-project --path "${OPENCV_JAVA_TEST_DIR}" --main "${OpenCV_BINARY_DIR}/android_sdk"
-    COMMAND ${ANDROID_EXECUTABLE} --silent update project --path "${OPENCV_JAVA_TEST_DIR}" --library "${__dep}"
-    MAIN_DEPENDENCY "${OPENCV_JAVA_TEST_DIR}/${ANDROID_MANIFEST_FILE}"
-    DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/${ANDROID_MANIFEST_FILE}"
-    COMMENT "Updating Android Java API test project")
-
-list(APPEND depends ${android_proj_target_files})
-
-# build java part
-add_custom_command(
-    OUTPUT "${OPENCV_JAVA_TEST_DIR}/bin/OpenCVTest-debug.apk"
-    COMMAND ${CMAKE_COMMAND} -E copy_if_different "$<TARGET_FILE:opencv_java>" "${OPENCV_JAVA_TEST_DIR}/libs/${ANDROID_NDK_ABI_NAME}/$<TARGET_FILE_NAME:opencv_java>"
-    COMMAND ${ANT_EXECUTABLE} -q -noinput -k debug -Djava.target=1.6 -Djava.source=1.6
-    COMMAND ${CMAKE_COMMAND} -E touch "${OPENCV_JAVA_TEST_DIR}/bin/OpenCVTest-debug.apk" # needed because ant does not update the timestamp of updated apk
-    WORKING_DIRECTORY "${OPENCV_JAVA_TEST_DIR}"
-    MAIN_DEPENDENCY "${OPENCV_JAVA_TEST_DIR}/${ANDROID_MANIFEST_FILE}"
-    DEPENDS opencv_java_android opencv_java
-    DEPENDS ${depends})
-
-add_custom_target(${PROJECT_NAME} ALL SOURCES "${OPENCV_JAVA_TEST_DIR}/bin/OpenCVTest-debug.apk" "${CMAKE_CURRENT_SOURCE_DIR}/${ANDROID_MANIFEST_FILE}")
-add_dependencies(${PROJECT_NAME} opencv_java ${__android_project_chain})
-set(__android_project_chain ${PROJECT_NAME} CACHE INTERNAL "auxiliary variable used for Android progects chaining" FORCE)
-
-# put the final .apk to the OpenCV's bin folder
-add_custom_command(TARGET ${PROJECT_NAME} POST_BUILD COMMAND ${CMAKE_COMMAND} -E copy_if_different "${OPENCV_JAVA_TEST_DIR}/bin/OpenCVTest-debug.apk" "${OpenCV_BINARY_DIR}/bin/${PROJECT_NAME}.apk")
-
-add_dependencies(opencv_tests ${PROJECT_NAME})
-
-if(PYTHON_DEFAULT_AVAILABLE)
-  set(CHECK_TEST_COVERAGE "${OPENCV_MODULE_opencv_java_LOCATION}/check-tests.py")
-  add_custom_command(TARGET ${PROJECT_NAME} POST_BUILD
-      COMMAND ${PYTHON_DEFAULT_EXECUTABLE} ${CHECK_TEST_COVERAGE} "${OPENCV_JAVA_TEST_DIR}/src" "${OPENCV_ANDROID_LIB_DIR}/src" > "${CMAKE_CURRENT_BINARY_DIR}/tests_coverage.log"
-      )
-endif()
+configure_file("${OpenCV_SOURCE_DIR}/platforms/android/gradle-wrapper/gradle/wrapper/gradle-wrapper.properties.in" "${OPENCV_ANDROID_TEST_DIR}/gradle/wrapper/gradle-wrapper.properties" @ONLY)

modules/java/test/android_test/build.gradle

@@ -0,0 +1,27 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+
+buildscript {
+
+    repositories {
+        google()
+        jcenter()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:7.3.1'
+        classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:1.5.20'
+
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        jcenter()
+    }
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}

modules/java/test/android_test/gradle.properties

@@ -0,0 +1,18 @@
+# Project-wide Gradle settings.
+
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx2g
+
+android.useAndroidX=true
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. More details, visit
+# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
+# org.gradle.parallel=true

modules/java/test/android_test/settings.gradle

@@ -0,0 +1,6 @@
+rootProject.name = 'android_test'
+
+include ':opencv'
+project(':opencv').projectDir = new File('../opencv_android/opencv')
+
+include ':tests_module'

modules/java/test/android_test/src/org/opencv/test/OpenCVTestCase.java

@@ -294,6 +294,13 @@ public class OpenCVTestCase extends TestCase {
             //assertTrue(Math.abs(ar1[i].doubleValue() - ar2[i].doubleValue()) <= epsilon);
     }
 
+    public static void assertArrayEquals(byte[] ar1, byte[] ar2) {
+        assertEquals(ar1.length, ar2.length);
+
+        for (int i = 0; i < ar1.length; i++)
+            assertEquals(ar1[i], ar2[i]);
+    }
+
     public static void assertArrayEquals(double[] ar1, double[] ar2, double epsilon) {
         assertEquals(ar1.length, ar2.length);
 

modules/java/test/android_test/src/org/opencv/test/OpenCVTestRunner.java

@@ -4,52 +4,29 @@ import java.io.File;
 import java.io.IOException;
 import junit.framework.Assert;
 
-import org.opencv.android.BaseLoaderCallback;
-import org.opencv.android.LoaderCallbackInterface;
 import org.opencv.android.OpenCVLoader;
 import org.opencv.android.Utils;
 import org.opencv.core.Mat;
 
 import android.content.Context;
-import android.test.AndroidTestRunner;
-import android.test.InstrumentationTestRunner;
 import android.util.Log;
 
+import androidx.test.runner.AndroidJUnitRunner;
+
+
 /**
  * This only class is Android specific.
  */
 
-public class OpenCVTestRunner extends InstrumentationTestRunner {
+public class OpenCVTestRunner extends AndroidJUnitRunner {
 
     private static final long MANAGER_TIMEOUT = 3000;
     public static String LENA_PATH;
     public static String CHESS_PATH;
     public static String LBPCASCADE_FRONTALFACE_PATH;
     public static Context context;
-
-    private AndroidTestRunner androidTestRunner;
     private static String TAG = "opencv_test_java";
 
-    private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(getContext()) {
-
-        @Override
-        public void onManagerConnected(int status) {
-            switch (status) {
-                case LoaderCallbackInterface.SUCCESS:
-                {
-                    Log("OpenCV loaded successfully");
-                    synchronized (this) {
-                        notify();
-                    }
-                } break;
-                default:
-                {
-                    super.onManagerConnected(status);
-                } break;
-            }
-        }
-    };
-
     public static String getTempFileName(String extension)
     {
         File cache = context.getCacheDir();
@@ -76,30 +53,13 @@ public class OpenCVTestRunner extends InstrumentationTestRunner {
 
     @Override
     public void onStart() {
-        // try to load internal libs
-        if (!OpenCVLoader.initDebug()) {
-            // There is no internal OpenCV libs
-            // Using OpenCV Manager for initialization;
+        Assert.assertTrue(OpenCVLoader.initLocal());
 
-            Log("Internal OpenCV library not found. Using OpenCV Manager for initialization");
-            OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION, getContext(), mLoaderCallback);
-
-            synchronized (this) {
-                try {
-                    wait(MANAGER_TIMEOUT);
-                } catch (InterruptedException e) {
-                    e.printStackTrace();
-                }
-            }
-        } else {
-            Log("OpenCV library found inside test package. Using it!");
-        }
-
-        context = getContext();
+        context = getTargetContext();
         Assert.assertNotNull("Context can't be 'null'", context);
-        LENA_PATH = Utils.exportResource(context, R.drawable.lena);
-        CHESS_PATH = Utils.exportResource(context, R.drawable.chessboard);
-        LBPCASCADE_FRONTALFACE_PATH = Utils.exportResource(context, R.raw.lbpcascade_frontalface);
+        LENA_PATH = Utils.exportResource(context, context.getResources().getIdentifier("lena", "drawable", context.getPackageName()));
+        CHESS_PATH = Utils.exportResource(context, context.getResources().getIdentifier("chessboard", "drawable", context.getPackageName()));
+        //LBPCASCADE_FRONTALFACE_PATH = Utils.exportResource(context, R.raw.lbpcascade_frontalface);
 
         /*
          * The original idea about test order randomization is from
@@ -111,12 +71,6 @@ public class OpenCVTestRunner extends InstrumentationTestRunner {
         super.onStart();
     }
 
-    @Override
-    protected AndroidTestRunner getAndroidTestRunner() {
-        androidTestRunner = super.getAndroidTestRunner();
-        return androidTestRunner;
-    }
-
     public static String getOutputFileName(String name)
     {
         return context.getExternalFilesDir(null).getAbsolutePath() + File.separatorChar + name;

modules/java/test/android_test/src/org/opencv/test/android/UtilsTest.java

@@ -17,6 +17,59 @@ import android.util.Log;
 
 public class UtilsTest extends OpenCVTestCase {
 
+    private int[] testImgWH = new int[]{64, 48};
+    private byte[] testImgBgColor = new byte[]{1, 2, 3};
+    private int[] testImgRect = new int[] {15, 17, 25, 37};
+    private byte[] testImgRectColor = new byte[]{45, 15, 67};
+
+    private Mat createTestBGRImg() {
+        Mat img = new Mat(testImgWH[1], testImgWH[0], CvType.CV_8UC3,
+                          new Scalar(testImgBgColor[2], testImgBgColor[1], testImgBgColor[0]));
+        byte[] color = new byte[]{testImgRectColor[2], testImgRectColor[1], testImgRectColor[0]};
+
+        for (int i = testImgRect[1]; i < testImgRect[3]; i++) {
+            for (int j = testImgRect[0]; j < testImgRect[2]; j++) {
+                img.put(i, j, color);
+            }
+        }
+        return img;
+    }
+
+    private Bitmap createTestBitmap() {
+        Bitmap img = Bitmap.createBitmap(testImgWH[0], testImgWH[1], Bitmap.Config.ARGB_8888);
+        img.eraseColor(Color.argb(255, testImgBgColor[0], testImgBgColor[1] ,testImgBgColor[2]));
+
+        for (int i = testImgRect[1]; i < testImgRect[3]; i++) {
+            for (int j = testImgRect[0]; j < testImgRect[2]; j++) {
+                img.setPixel(j, i, Color.argb(
+                        255, testImgRectColor[0], testImgRectColor[1], testImgRectColor[2]));
+            }
+        }
+        return img;
+    }
+
+    public void testMatBitmapConversion() {
+        Mat mat = new Mat();
+        Imgproc.cvtColor(createTestBGRImg(), mat, Imgproc.COLOR_BGR2RGBA);
+        Bitmap bmp = createTestBitmap();
+
+        Bitmap convertedBmp = Bitmap.createBitmap(
+                Bitmap.createBitmap(testImgWH[0], testImgWH[1], Bitmap.Config.ARGB_8888));
+        Utils.matToBitmap(mat, convertedBmp);
+        assertTrue(bmp.sameAs(convertedBmp));
+
+        Mat convertedMat = new Mat();
+        Utils.bitmapToMat(bmp, convertedMat);
+        Mat diff = new Mat();
+        Core.absdiff(mat, convertedMat, diff);
+        Scalar channelsDiff = Core.sumElems(diff);
+        assertEquals(0.0, channelsDiff.val[0]);
+        assertEquals(0.0, channelsDiff.val[1]);
+        assertEquals(0.0, channelsDiff.val[2]);
+        assertEquals(0.0, channelsDiff.val[3]);
+    }
+
+
     public void testBitmapToMat() {
         BitmapFactory.Options opt16 = new BitmapFactory.Options();
         opt16.inPreferredConfig = Bitmap.Config.RGB_565;

modules/java/test/android_test/tests_module/AndroidManifest.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          package="org.opencv.samples.tutorial1"
+>
+
+    <application
+        android:theme="@android:style/Theme.NoTitleBar.Fullscreen" >
+    </application>
+
+</manifest>

modules/java/test/android_test/tests_module/build.gradle.in

@@ -0,0 +1,35 @@
+apply plugin: 'com.android.application'
+
+android {
+    namespace 'org.opencv.tests'
+    compileSdkVersion @ANDROID_COMPILE_SDK_VERSION@
+    defaultConfig {
+        applicationId "org.opencv.tests"
+        minSdkVersion @ANDROID_MIN_SDK_VERSION@
+        targetSdkVersion @ANDROID_TARGET_SDK_VERSION@
+        versionCode 301
+        versionName "3.01"
+
+        testInstrumentationRunner "org.opencv.test.OpenCVTestRunner"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+    sourceSets {
+        androidTest {
+            java.srcDirs = [@ANDROID_TESTS_SRC_DIRS@]
+        }
+        main {
+            manifest.srcFile 'AndroidManifest.xml'
+            res.srcDirs = [@ANDROID_TESTS_RES_DIR@]
+        }
+    }
+}
+
+dependencies {
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
+    implementation project(':opencv')
+}

modules/objdetect/misc/java/test/BarcodeDetectorTest.java

@@ -16,10 +16,15 @@ public class BarcodeDetectorTest extends OpenCVTestCase {
     protected void setUp() throws Exception {
         super.setUp();
 
+        // relys on https://developer.android.com/reference/java/lang/System
+        isTestCaseEnabled = System.getProperties().getProperty("java.vm.name") != "Dalvik";
+
+        if (isTestCaseEnabled) {
             testDataPath = System.getenv(ENV_OPENCV_TEST_DATA_PATH);
             if (testDataPath == null)
                 throw new Exception(ENV_OPENCV_TEST_DATA_PATH + " has to be defined!");
         }
+    }
 
     public void testDetectAndDecode() {
         Mat img = Imgcodecs.imread(testDataPath + "/cv/barcode/multiple/4_barcodes.jpg");

modules/objdetect/misc/java/test/QRCodeDetectorTest.java

@@ -19,10 +19,15 @@ public class QRCodeDetectorTest extends OpenCVTestCase {
     protected void setUp() throws Exception {
         super.setUp();
 
+        // relys on https://developer.android.com/reference/java/lang/System
+        isTestCaseEnabled = System.getProperties().getProperty("java.vm.name") != "Dalvik";
+
+        if (isTestCaseEnabled) {
             testDataPath = System.getenv(ENV_OPENCV_TEST_DATA_PATH);
             if (testDataPath == null)
                 throw new Exception(ENV_OPENCV_TEST_DATA_PATH + " has to be defined!");
         }
+    }
 
     public void testDetectAndDecode() {
         Mat img = Imgcodecs.imread(testDataPath + "/cv/qrcode/link_ocv.jpg");