去官网下载jar包 

http://repo1.maven.org/maven2/com/google/zxing

把jar包导入Android中的libs中

在build.gradle中添加

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
 
    implementation 'com.android.support:appcompat-v7:27.1.1'
    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'
    //************添加区域*********************//
    implementation files('libs/core-3.3.0.jar')
    //************添加区域*********************//
}

 
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转载于：https://blog.csdn.net/zb774095236/article/details/91378309