easyPR1.4库Android端移植和使用以及注意事项

 

车牌识别代码参考至github上面的EasyPR_Android的源码，感谢为开源付出贡献的程序猿 
源码地址 ：https://github.com/linuxxx/EasyPR_Android

移植步骤

1.下载源码到本地，将以下文件拷贝到将要移植的项目中，并进行资准备

（1）库文件以及jni文件拷贝到对应项目的main路径下

（2）Opencv所需环境文件拷贝到根目录

 （3）将已训练好的svm和ann等数据模型文件拷贝到res目录下（有关SVM和CNN相关知识）

 （4）修改路径下的EasyPR.cpp和EasyPR.h中的函数定义和函数原型

 

2.下载nak压缩包并解压

资源准备好后，进入Android项目后，到local.properties文件添加NDK路径

 

3.代码段 

AndroidManifest.xml文件

    
    //手机文件内部存储权限

    
        
            
                
                
            
        
    

build.gradle文件

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    buildToolsVersion '28.0.2'
    defaultConfig {
        applicationId "com.example.administrator.cptest"
        minSdkVersion 26
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        
        javaCompileOptions {
            annotationProcessorOptions {
                includeCompileClasspath = true
            }
        }
    }

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

    sourceSets.main {
        jni.srcDirs = [] // This prevents the auto generation of Android.mk
        jniLibs.srcDir 'src/main/libs' // This is not necessary unless you have precompiled libraries in your project.
    }

    task buildNative(type: Exec, description: 'Compile JNI source via NDK') {
        def ndkDir = android.ndkDirectory
        commandLine "$ndkDir/ndk-build.cmd",
                '-C', file('src/main/jni').absolutePath, // Change src/main/jni the relative path to your jni source
                '-j', Runtime.runtime.availableProcessors(),
                'all',
                'NDK_DEBUG=0'
    }

    task cleanNative(type: Exec, description: 'Clean JNI object files') {
        def ndkDir = android.ndkDirectory
        commandLine "$ndkDir/ndk-build.cmd",
                '-C', file('src/main/jni').absolutePath, // Change src/main/jni the relative path to your jni source
                'clean'
    }

    clean.dependsOn 'cleanNative'

    tasks.withType(JavaCompile) {
        compileTask -> compileTask.dependsOn buildNative
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
   
     /*额外添加
    implementation 'com.jakewharton:butterknife:7.0.1'
    implementation 'cn.pedant.sweetalert:library:1.3'
}

 然后把需要的功能类拷贝到自己的项目中编译和调试即可

注意：把应用程序下载到手机后需要开启应用程序的存储权限，不然会闪退。