1、新建config.gradle

在android studio的根專案中新建config.gradle檔案(和settings.gradble同目錄)
開始寫想要的資訊

ext {
    android = [
            compileSdkVersion   : 26,
            buildToolsVersion   : '26.0.2',
            applicationId       : 'com.laisontech.rxjavedemo',
            minSdkVersion       : 17,
            targetSdkVersion    : 26
 
,
            versionCode         : 1,
            versionName         : 'v 1.1.0',
            defaultPublishConfig: 'release',
            publishNonDefault   : true
    ]
    dependencies = [
            "appcompat-v7"     : 'com.android.support:appcompat-v7:26.1.0',
            "support-design"   : 'com.android.support:design:+'
 
,

            "junit"            : 'junit:junit:4.12',
            "gson"             : 'com.google.code.gson:gson:2.8.0',
            "rxandroid"        : 'io.reactivex:rxandroid:1.2.1',
            "rxjava"           : 'io.reactivex:rxjava:1.2.4',
            "constraint-layout": 'com.android.support.constraint:constraint-layout:1.0.2'
 
,
            "retrofit"         : 'com.squareup.retrofit2:retrofit:2.2.0',
            "converter-gson"   : 'com.squareup.retrofit2:converter-gson:2.2.0',
            "adapter-rxjava"   : 'com.squareup.retrofit2:adapter-rxjava:2.1.0',
            "butterknife"      : 'com.jakewharton:butterknife:8.5.1',
            "eventbus"         : 'org.greenrobot:eventbus:3.0.0'

    ]
}

2、在moule.gradle中寫入配置資訊

apply plugin: 'com.android.application'

android {
    compileSdkVersion  rootProject.ext.android["compileSdkVersion"]
    defaultConfig {
        applicationId rootProject.ext.android["applicationId"]
        minSdkVersion rootProject.ext.android["minSdkVersion"]
        targetSdkVersion rootProject.ext.android["targetSdkVersion"]
        versionCode rootProject.ext.android["versionCode"]
        versionName rootProject.ext.android["versionName"]
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'

    compile rootProject.ext.dependencies["constraint-layout"]
    compile rootProject.ext.dependencies["junit"]
    compile rootProject.ext.dependencies["appcompat-v7"]
    compile rootProject.ext.dependencies["rxandroid"]
    compile rootProject.ext.dependencies["rxjava"]
    compile rootProject.ext.dependencies["gson"]
    compile rootProject.ext.dependencies["retrofit"]
    compile rootProject.ext.dependencies["converter-gson"]
    compile rootProject.ext.dependencies["adapter-rxjava"]
    compile rootProject.ext.dependencies["eventbus"]
    compile rootProject.ext.dependencies["butterknife"]
    annotationProcessor 'com.jakewharton:butterknife-compiler:8.5.1'//取出了 apt的加入方式 改為annotationProcessor，另外將 路徑apt的刪除掉
}

3、在專案的build.gradle中新增

apply from: "config.gradle"

 最後重構這個專案即可。