依赖

config.gradle

ext {
  
    dependencies = [
          
            "retrofit2"        : "com.squareup.retrofit2:retrofit:2.4.0",
            "converter-gson"   : "com.squareup.retrofit2:converter-gson:2.4.0",
            "adapter-rxjava"  :  "com.squareup.retrofit2:adapter-rxjava2:2.4.0",
            "rxjava2"          : "io.reactivex.rxjava2:rxjava:2.1.13",
            "rxjava2:rxandroid": "io.reactivex.rxjava2:rxandroid:2.0.2",
            "dagger"           : "com.google.dagger:dagger:2.8",
            "dagger-compiler" : "com.google.dagger:dagger-compiler:2.7"

    ]
}

在总的  build.gradle 中第二行添加    apply from: "config.gradle"

在所对应的app     build.gradle中   依赖为：

 implementation rootProject.ext.dependencies["retrofit2"]
    implementation rootProject.ext.dependencies["converter-gson"]
    implementation rootProject.ext.dependencies["rxjava2"]
    implementation rootProject.ext.dependencies["rxjava2:rxandroid"]
    implementation rootProject.ext.dependencies["dagger"]
    annotationProcessor rootProject.ext.dependencies["dagger-compiler"]
    implementation rootProject.ext.dependencies["adapter-rxjava"]

    implementation 'com.android.support:support-v4:27.1.1'
    implementation 'com.sunfusheng:marqueeview:1.3.3'//跑马灯依赖
    implementation 'com.jcodecraeer:xrecyclerview:1.3.2'