How to use opencv in using Gradle

Question

I want to use Android Studio to develop an app using Gradle build tool  I can not insert the OpenCV repo and library on build gradle  My  gradle file is like below    buildscript       repositories           mavenCentral              dependencies           classpath  com android tools build gradle 0 5            apply plugin   android   repositories       mavenCentral      dependencies       compile  com android support support-v4 13 0       android       compileSdkVersion 17     buildToolsVersion  17 0 0       defaultConfig           minSdkVersion 7         targetSdkVersion 16           How can I add OpenCV in my project

User · Answer

I ve imported the Java project from OpenCV SDK into an Android Studio gradle project and made it available at https   github com ctodobom OpenCV-3 1 0-Android  You can include it on your project only adding two lines into build gradle file thanks to jitpack io service

User · Answer

The OpenCV Android SDK has an example gradle build file with helpful comments  https   github com opencv opencv blob master modules java android sdk build gradle in        Notes about integration OpenCV into existed Android Studio application project are below  application  app  module should exist         This file is located in  lt OpenCV-android-sdk gt  sdk directory  near  etc    java    native  subdirectories        Add module into Android Studio application project        - Android Studio way        will copy almost all OpenCV Android SDK into your project   200Mb          Import module  Menu - gt   File  - gt   New  - gt   Module  - gt   Import Gradle project        Source directory  select this  sdk  directory      Module name    opencv        - or attach library module from OpenCV Android SDK       without copying into application project directory  allow to share the same module between projects          Edit  settings gradle  and add these lines          def opencvsdk   lt path to opencv android sdk rootdir gt           You can put declaration above into gradle properties file instead  including file in HOME directory           but without  def  and apostrophe symbols      opencvsdk  lt path to opencv android sdk rootdir gt       include   opencv       project   opencv   projectDir   new File opencvsdk     sdk               Add dependency into application module        - Android Studio way        Open Module Settings   F4  - gt   Dependencies  tab       - or add  project   opencv    dependency into app build gradle          dependencies            implementation fileTree dir   libs   include      jar                          implementation project   opencv                      Load OpenCV native library before using        - avoid using of  OpenCVLoader initAsync    approach - it is deprecated      It may load library with different version  from OpenCV Android Manager  which is installed separatelly on device        - use  System loadLibrary  opencv java3    or  OpenCVLoader initDebug         TODO  Add accurate API to load OpenCV native library             Native C   support  necessary to use OpenCV in native code of application only         - Use find package   in app CMakeLists txt          find package OpenCV 3 4 REQUIRED java                target link libraries native-lib   OpenCV LIBRARIES         - Add  OpenCV DIR  and enable C   exceptions RTTI support via app build gradle      Documentation about CMake options  https   developer android com ndk guides cmake html         defaultConfig                         externalNativeBuild                cmake                    cppFlags  -std c  11 -frtti -fexceptions                   arguments  -DOpenCV DIR     opencvsdk     sdk native jni        -DANDROID ARM NEON TRUE                                         -  optional  Limit filter ABIs to build   android  scope of  app build gradle         Useful information  https   developer android com studio build gradle-tips html  Configure separate APKs per ABI          splits            abi                enable true              reset                include  armeabi-v7a        x86    x86 64    arm64-v8a               universalApk false                       apply plugin   com android library   println  OpenCV      project buildscript sourceFile  android       compileSdkVersion 27       buildToolsVersion  27 0 3     not needed since com android tools build gradle 3 0 0      defaultConfig           minSdkVersion 14         targetSdkVersion 21            buildTypes           release               minifyEnabled false             proguardFiles getDefaultProguardFile  proguard-android txt     proguard-rules txt                      compileOptions           sourceCompatibility JavaVersion VERSION 1 6         targetCompatibility JavaVersion VERSION 1 6            sourceSets           main               jniLibs srcDirs     native libs               java srcDirs     java src               aidl srcDirs     java src               res srcDirs     java res               manifest srcFile  java AndroidManifest xml                     dependencies

User · Answer

It works with Android Studio 1 2   OpenCV-2 4 11-android-sdk   zip   too    Just do the following   1  Follow the answer that starts with  You can do this very easily in Android Studio   Follow the steps below to add OpenCV in your project as library   by TGMCians   2  Modify in the  lt yourAppDir gt  libraries opencv folder your newly created build gradle to  step 4 in TGMCians  answer  adapted to OpenCV2 4 11-android-sdk and using gradle 1 1 0    apply plugin   android-library   buildscript       repositories           mavenCentral             dependencies           classpath  com android tools build gradle 1 1 0           android       compileSdkVersion 21     buildToolsVersion  21 1 2       defaultConfig           minSdkVersion 8         targetSdkVersion 21         versionCode 2411         versionName  2 4 11             sourceSets           main               manifest srcFile  AndroidManifest xml              java srcDirs     src               resources srcDirs     src               res srcDirs     res               aidl srcDirs     src                       3    so files that are located in the directories  armeabi    armeabi-v7a    mips    x86  can be found under  default OpenCV-location      OpenCV-2 4 11-android-sdk OpenCV-android-sdk sdk native libs  step 9 in TGMCians  answer    Enjoy and if this helped  please give a positive reputation  I need 50 to answer directly to answers  19 left

User · Answer

These are the steps necessary to use OpenCV with Android Studio 1 2    Download OpenCV and extract the archive Open your app project in Android Studio Go to File -  New -  Import Module    Select sdk java in the directory you extracted before Set Module name to opencv Press Next then Finish Open build gradle under imported OpenCV module and update compileSdkVersion and buildToolsVersion to versions you have on your machine Add compile project   opencv   to your app build gradle  dependencies               compile project   opencv      Press Sync Project with Gradle Files

User · Answer

You can do this very easily in Android Studio    Follow the below steps to add Open CV in your project as library    Create a libraries folder underneath your project main directory  For example  if your project is OpenCVExamples  you would create a OpenCVExamples libraries folder  Go to the location where you have SDK   OpenCV-2 4 8-android-sdk sdk  here you will find the java folder  rename it to opencv  Now copy the complete opencv directory from the SDK into the libraries folder you just created  Now create a build gradle file in the opencv directory with the following contents  apply plugin   android-library   buildscript       repositories           mavenCentral             dependencies           classpath  com android tools build gradle 0 9             android       compileSdkVersion 19     buildToolsVersion  19 0 1       defaultConfig           minSdkVersion 8         targetSdkVersion 19         versionCode 2480         versionName  2 4 8             sourceSets           main               manifest srcFile  AndroidManifest xml              java srcDirs     src               resources srcDirs     src               res srcDirs     res               aidl srcDirs     src                      Edit your settings gradle file in your application   s main directory and add this line   include   libraries opencv   Sync your project with Gradle and it should looks like this   Right click on your project then click on the Open Module Settings then Choose Modules from the left-hand list  click on your application   s module  click on the Dependencies tab  and click on the   button to add a new module dependency     Choose Module dependency  It will open a dialog with a list of modules to choose from  select     libraries opencv       Create a jniLibs folder in the  app src main  location and copy the all the folder with   so files  armeabi  armeabi-v7a  mips  x86  in the jniLibs from the OpenCV SDK    Click OK  Now everything done  go and enjoy with OpenCV

User · Answer

If you don t want to use JavaCV this works for me     Step 1- Download the Resources  Download OpenCV Android SDK from http   opencv org downloads html  Step 2 - Copying the OpenCV binaries into your APK  Copy libopencv info so  amp  libopencv java so from   OpenCV-2    -android-sdk - gt  sdk - gt  native - gt  libs - gt  armeabi-v7a  to   Project Root - gt  Your Project - gt  lib -  gt  armeabi-v7a  Zip the lib folder up and rename that zip to whatever-v7a jar   Copy this  jar file and place it in here in your project  Project Root - gt  Your Project - gt  libs  Add this line to your projects build gradle in the dependencies section  compile files  libs whatever-v7a jar    When you compile now you will probably see your  apk is about 4mb bigger    Repeat for  armeabi  if you want to support ARMv6 too  likely not needed anymore    Step 3 - Adding the java sdk to your project  Copy the java folder from here  OpenCV-2    -android-sdk - gt  sdk  to  Project Root - gt  Your Project - gt  libs  Same place as your  jar file     You can rename the  java  folder name to  OpenCV    In this freshly copied folder add a typical build gradle file  I used this   buildscript       repositories           mavenCentral             dependencies           classpath  com android tools build gradle 0 6             apply plugin   android-library   repositories       mavenCentral       android       compileSdkVersion 19     buildToolsVersion  19       defaultConfig           minSdkVersion 15         targetSdkVersion 19            sourceSets           main               manifest srcFile  AndroidManifest xml              java srcDirs     src               resources srcDirs     src               aidl srcDirs     src               renderscript srcDirs     src               res srcDirs     res               assets srcDirs     assets                       In your Project Root settings gradle file change it too look something like this   include   Project Name libs OpenCV     Project Name   In your Project Root -  Project Name -  build gradle file in the dependencies section add this line   compile project   Project Name libs OpenCV    Step 4 - Using OpenCV in your project  Rebuild and you should be able to import and start using OpenCV in your project   import org opencv android OpenCVLoader      if   OpenCVLoader initDebug         I know this if a bit of hack but I figured I would post it anyway

User · Answer

As per OpenCV docs 1   below steps using OpenCV manager is the recommended way to use OpenCV for production runs  But  OpenCV manager 2  is an additional install from Google play store  So  if you prefer a self contained apk not using OpenCV manager  or is currently in development testing phase  I suggest answer at https   stackoverflow com a 27421494 1180117   Recommended steps for using OpenCV in Android Studio with OpenCV manager    Unzip OpenCV Android sdk downloaded from OpenCV org 3  From File - gt  Import Module  choose sdk java folder in the unzipped opencv archive    Update build gradle under imported OpenCV module to update 4 fields to match your project s build gradle a  compileSdkVersion b  buildToolsVersion c  minSdkVersion and 4  targetSdkVersion    Add module dependency by Application - gt  Module Settings  and select the Dependencies tab  Click   icon at bottom or right   choose Module Dependency and select the imported OpenCV module    As the final step  in your Activity class  add snippet below       public class SampleJava extends Activity             private BaseLoaderCallback mLoaderCallback   new BaseLoaderCallback this             Override         public void onManagerConnected int status                switch status                    case LoaderCallbackInterface SUCCESS                      Log i TAG  OpenCV Manager Connected                          from now onwards  you can use OpenCV API                     Mat m   new Mat 5  10  CvType CV 8UC1  new Scalar 0                        break                  case LoaderCallbackInterface INIT FAILED                      Log i TAG  Init Failed                        break                  case LoaderCallbackInterface INSTALL CANCELED                      Log i TAG  Install Cancelled                        break                  case LoaderCallbackInterface INCOMPATIBLE MANAGER VERSION                      Log i TAG  Incompatible Version                        break                  case LoaderCallbackInterface MARKET ERROR                      Log i TAG  Market Error                        break                  default                      Log i TAG  OpenCV Manager Install                        super onManagerConnected status                       break                                       Override     protected void onResume             super onResume              initialize OpenCV manager         OpenCVLoader initAsync OpenCVLoader OPENCV VERSION 2 4 9  this  mLoaderCallback             Note  You could only make OpenCV calls after you receive success callback on onManagerConnected method  During run  you will be prompted for installation of OpenCV manager from play store  if it is not already installed  During development  if you don t have access to play store or is on emualtor  use appropriate OpenCV manager apk present in apk folder under downloaded OpenCV sdk archive     Pros   Apk size reduction by around 40 MB   consider upgrades too     OpenCV manager installs optimized binaries for your hardware which could help  speed  Upgrades to OpenCV manager might save your app from bugs in OpenCV  Different apps could share same OpenCV library    Cons     End user experience - might not like a install prompt from with your application

User · Answer

buildscript       repositories           mavenCentral             dependencies           classpath  com android tools build gradle 0 5            apply plugin   android   repositories       mavenCentral       maven           url  http   maven2 javacv googlecode com git            dependencies       compile  com android support support-v4 13 0        compile  com googlecode javacv javacv 0 5      instrumentTestCompile  junit junit 4 4     android       compileSdkVersion 14     buildToolsVersion  17 0 0       defaultConfig           minSdkVersion 7         targetSdkVersion 14           This is worked for me

User · Answer

Since the integration of OpenCV is such an effort  we pre-packaged it and published it via JCenter here  https   github com quickbirdstudios opencv-android  Just include this in your module s build gradle dependencies section  dependencies     implementation  com quickbirdstudios opencv 3 4 1      and this in your project s build gradle repositories section  repositories     jcenter       You won t get lint error after gradle import but don t forget to initialize the OpenCV library like this in MainActivity  public class MainActivity extends Activity       static           if   OpenCVLoader initDebug                Log d  ERROR    Unable to load OpenCV            else             Log d  SUCCESS    OpenCV loaded

User · Answer

The following permissions and features are necessary in the AndroidManifest xml file without which you will get the following dialog box   It seems that your device does not support camera  or it is locked   Application will be closed      lt uses-permission android name  android permission CAMERA   gt        lt uses-feature android name  android hardware camera  android required  false   gt       lt uses-feature android name  android hardware camera autofocus  android required  false   gt       lt uses-feature android name  android hardware camera front  android required  false   gt       lt uses-feature android name  android hardware camera front autofocus  android required  false   gt

User · Answer

OpenCV  Android Studio 1 4 1  gradle-experimental plugin 0 2 1  None of the other answers helped me  Here s what worked for me  I m using the tutorial-1 sample from opencv but I will be doing using the NDK in my project so I m using the gradle-experimental plugin which has a different structure than the gradle plugin   Android studio should be installed  the Android NDK should be installed via the Android SDK Manager  and the OpenCV Android SDK should be downloaded and unzipped   This is in chunks of bash script to keep it compact but complete  It s also all on the command line because on of the big problems I had was that in-IDE instructions were obsolete as the IDE evolved   First set the location of the root directory of the OpenCV SDK   export OPENCV SDK  home user wip OpenCV-2 4 11-android-sdk cd  OPENCV SDK   Create your gradle build files     First the OpenCV library  cat  gt   OPENCV SDK sdk java build gradle  lt  lt         apply plugin   com android model library  model       android           compileSdkVersion   23         buildToolsVersion    23 0 2           defaultConfig with               minSdkVersion apiLevel   8             targetSdkVersion apiLevel   23                      android buildTypes           release               minifyEnabled   false                   debug              minifyEnabled   false                    android sources          main manifest source srcDirs                main res source srcDirs      res         main aidl source srcDirs      src         main java source srcDirs      src                  Then tell the tutorial sample what to label the library as and where to find it   cat  gt   OPENCV SDK samples tutorial-1-camerapreview settings gradle  lt  lt         include   openCVLibrary2411  project   openCVLibrary2411   projectDir   new File        sdk java           Create the build file for the tutorial    cat  gt   OPENCV SDK samples tutorial-1-camerapreview build gradle  lt  lt         buildscript       repositories           jcenter             dependencies           classpath  com android tools build gradle-experimental 0 2 1           allprojects       repositories           jcenter            apply plugin   com android model application   model       android           compileSdkVersion   23         buildToolsVersion    23 0 2           defaultConfig with               applicationId    org opencv samples tutorial1              minSdkVersion apiLevel   8             targetSdkVersion apiLevel   23                      android sources          main manifest source srcDirs                main res source srcDirs      res         main aidl source srcDirs      src         main java source srcDirs      src              android buildTypes           release               minifyEnabled   false             proguardFiles    file  proguard-rules pro                     debug                minifyEnabled   false                    dependencies       compile project   openCVLibrary2411             Your build tools version needs to be set correctly  Here s an easy way to see what you have installed   You can install other versions via the Android SDK Manager   Change buildToolsVersion if you don t have 23 0 2   echo  Your buildToolsVersion is one of    ls  ANDROID HOME build-tools   Change the environment variable on the first line to your version number  REP 23 0 2  CHANGE ME sed -i bak s 23  0  2   REP  g  OPENCV SDK sdk java build gradle sed -i bak s 23  0  2   REP  g  OPENCV SDK samples tutorial-1-camerapreview build gradle   Finally  set up the correct gradle wrapper  Gradle needs a clean directory to do this    pushd   mktemp -d   gradle wrapper --gradle-version 2 5  mv -f gradle   OPENCV SDK samples tutorial-1-camerapreview popd   You should now be all set  You can now browse to this directory with Android Studio and open up the project   Build the tutoral on the command line with the following command     gradlew assembleDebug   It should build your apk  putting it in   build outputs apk

User · Answer

I have posted a new post about how to build an Android NDK application with OpenCV included using Android Studio and Gradle  More information can be seen here  I have summarized two methods    1  run ndk-build within Gradle task  sourceSets main jni srcDirs       task ndkBuild type  Exec  description   Compile JNI source via NDK         ndkDir   project plugins findPlugin  com android application   getNdkFolder       commandLine   ndkDir ndk-build                NDK PROJECT PATH build intermediates ndk                NDK LIBS OUT src main jniLibs                APP BUILD SCRIPT src main jni Android mk                NDK APPLICATION MK src main jni Application mk     tasks withType JavaCompile        compileTask - gt  compileTask dependsOn ndkBuild      2  run ndk-build with an external tool  Parameters   NDK PROJECT PATH  ModuleFileDir  build intermediates ndk NDK LIBS OUT  ModuleFileDir  src main jniLibs NDK APPLICATION MK  ModuleFileDir  src main jni Application mk APP BUILD SCRIPT  ModuleFileDir  src main jni Android mk V 1  More information can be seen here

[android] How to use opencv in using Gradle?

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