android 项目依赖 build.gradle 管理

最近做了个项目涉及到多个模块化设计，为了保证build.gradle 的统一管理，做了相应的配置方便修改。
一、首先在项目中创建一个config.gradle文件

在里面写android配置及依赖配置如下：

ext{
    //android 配置
    android =[
            compileSdkVersion : 29,
            buildToolsVersion :"29.0.3",
            applicationId : "com.bin.meet",
            minSdkVersion : 19,
            targetSdkVersion :29,
            versionCode : 1,
            versionName :"1.0"
    ]

    //依赖配置
    dependencies = [
            "httpclient" : 'org.apache.http.legacy',
            "appcompat": 'androidx.appcompat:appcompat:1.1.0',
               "eventbus"       : 'org.greenrobot:eventbus:3.1.1',
              "tablayout"      : 'com.google.android.material:material:1.0.0',
    ]

    //创库
    maven = [
        "bmobUrl" : "https://raw.github.com/bmob/bmob-android-sdk/master"
    ]
}

二、在整个项目的配置文件中引用刚自定义的config.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.
//引入自定义Gradle配置文件
apply from: "config.gradle"
buildscript {
    repositories {
        google()
        jcenter()
        
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.5.3'
        
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
        maven{
            url rootProject.ext.maven["bmobUrl"]
        }
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

三、在核心代码库中应用依赖如下

apply plugin: 'com.android.library'

android {
    compileSdkVersion rootProject.ext.android["compileSdkVersion"]
    buildToolsVersion rootProject.ext.android["buildToolsVersion"]

    useLibrary rootProject.ext.dependencies["httpclient"]
    defaultConfig {
        minSdkVersion rootProject.ext.android["minSdkVersion"]
        targetSdkVersion rootProject.ext.android["targetSdkVersion"]
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        consumerProguardFiles 'consumer-rules.pro'
    }

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

}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.1.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
    implementation rootProject.ext.dependencies["appcompat"]
    api rootProject.ext.dependencies["appcompat"]
    api rootProject.ext.dependencies["eventbus"]
    api rootProject.ext.dependencies["tablayout"]
    api project(path: ':IMLib')
}

其中要用api 依赖，以便其他模块都可以正常编译，否则编译出错。
四、在 app module 中添加以下依赖即可
dependencies {
implementation fileTree(dir: ‘libs’, include: [’*.jar’])
implementation rootProject.ext.dependencies[“appcompat”]
implementation ‘androidx.constraintlayout:constraintlayout:1.1.3’
implementation ‘androidx.appcompat:appcompat:1.1.0’
testImplementation ‘junit:junit:4.12’
androidTestImplementation ‘androidx.test.ext:junit:1.1.1’
androidTestImplementation ‘androidx.test.espresso:espresso-core:3.2.0’
implementation project(path: ‘:framework’) //添加framework依赖

**这样做的目的就是方便api 修改，不需要大量修改文件，节约项目的开发时间和维护的成本。