如何将Android Gradle应用打包到* .jar或* .aar文件

Question

I created Android App with some gradle dependencies. Now I want to create from this project *.jar (without resources and add them separately) file or *.aar file. I tried to create new library project (with build.xml), copied my *.java and res files and run ant jar , I'm fixing problem one by one. Is there any better solution to do this?

Answer 1

You need to make two modules. The first module would be the jar . This should be POJO s (Plain Old Java Object) and nothing Android. The second module would be the aar . This could depend on your first project but add on the Android specific code / resources.

Then your project ( MyApp ) structure would look like this

MyApp/
MyApp/build.gradle
MyApp/settings.gradle
MyApp/PoJoProject/
MyApp/PoJoProject/build.gradle
MyApp/AndroidProject/
MyApp/AndroidProject/build.gradle

Then your settings.gradle file would look something like this:

include ':PoJoProject', ':AndroidProject'

Now in the modules

In MyApp/PoJoProject/build.gradle you will want to apply the java plugin. This module will build to the desired jar format that can be ran anywhere on the normal JVM .

plugins {
    id 'java'
}

version '1.00'
group 'com.example.multimodule.gradle'

repositories {
    jcenter()
}

dependencies {
    compile 'com.google.code.gson:gson:2.5'
    testCompile 'junit:junit:4.12'
}

compileJava {
    sourceCompatibility = JavaVersion.VERSION_1_8
    targetCompatibility = JavaVersion.VERSION_1_8
}

In the MyApp/AndroidProject/build.gradle you want to apply the android plugin. This module will build to the desired aar format and can only be used as an Android dependency.

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.0.0-alpha3'
    }
}
apply plugin: 'com.android.application'

// version could be different from app version if needed
// `version` & `group` could also be in the top level build.gradle
version '1.00'
group 'com.example.multimodule.gradle'

repositories {
    jcenter()
}

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"

    defaultConfig {
        applicationId "com.example.multiproject.gradle.android"
        minSdkVersion 19
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    testOptions {
        unitTests.returnDefaultValues = true
    }
}

dependencies {
    // let the android `aar` project use code from the `jar` project
    compile project(':PoJoProject')
    testCompile 'junit:junit:4.12'
}