环境搭建

一、创建Android Studio项目

1.打开Android Studio IDE 点击 File -> New -> New Project

Create New Project.png

2.Empty Activity -> Next -> Finish

Create New Project.png

二、导入 OpenCV Android SDK 依赖项

1.File -> New -> Import Module ->OK
2.选择OpenCV4的路径（必须选择到java目录上）
例如： D:\OpenCVandroidSDK\sdk\java

Select Source Location.png
3.修改模板名称
Next -> Finish

Import Module.png

三、修改build.gradle文件

apply plugin: 'com.android.application'"修改为“apply plugin: 'com.android.library'
1.1选择build.gradle（OpenCV4）
1.2将apply plugin: 'com.android.application'修改为“apply plugin: 'com.android.library'

Modify Gradle.png

2.将文件中的自动生成的applicationId "org.opencv"删除，因为OpenCV4模块是属于library而不是application

Modify Gradle.png
3.将compileSdkVersion 、buildToolsVersion、minSdkVersion 、targetSdkVersion 属性值的设置与app对应的build.gradle文件的配置一致。
OpenCV4.png
app.png

4.添加jniLibs文件夹

1.在 app -> src -> main 文件夹下添加jniLibs
1.1 File -> New -> directory

jniLibs.png

1.2 app目录如下

Content.png
1.3将OpenCVandroidSDK\sdk\native\libs内的架构文件复制到jniLibs中

copy.png

contentcopy.png

4.配置app中的build.gradle进行配置，增加jniLibs.srcDirs参数

sourceSets{
    main{
        jniLibs.srcDirs = ['src/main/jniLibs']
    }
}

5.配置支持的ndk类型，把架构包写到app对应的build.gradle中

        ndk{
            abiFilters "arm64-v8a","armeabi-v7a","x86","x86_64"
        }

6.OpenCV4 build.gradle

apply plugin: 'com.android.library'

android {
    compileSdkVersion 28
    buildToolsVersion "28.0.3"

    defaultConfig {
        
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
        }
    }
}

7.app build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    buildToolsVersion "28.0.3"
    defaultConfig {
        applicationId "com.example.opencvdemo"
        minSdkVersion 28
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"

        ndk{
            abiFilters "arm64-v8a","armeabi-v7a","x86","x86_64"
        }

    }

    sourceSets{
        main{
            jniLibs.srcDirs = ['src/main/jniLibs']
        }
    }



    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.0.2'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.2.0'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
}