aar 與 jar

jar 是 Java的打包檔, 但無法包含 res 裏的資源檔, 這真的會讓人很想死. 因為如果不能包含 res裏的檔案, 那麼 layout裏的設定全都要用動態程式碼的方式重新撰寫, 是這非常痛苦的.

aar就是解救這問題的良方, 設定及作法如同上一章的Export to jar, 唯一不同的, 就是如下專案的gradle的幾個設定而以.

輸出路徑

aar的輸出路徑如下

build/outputs/aar/app-release.aar

aar gradle 設定

//刪除舊有的jar檔
task deleteOldJar(type: Delete) {
    delete 'release/mahalsdk-1.3.0.jar'
}

task exportRoot(type: Copy){
    from('build/intermediates/intermediate-jars/release/')
    into ('release/')
    include('classes.jar')
    rename('classes.jar', 'mahalsdk-1.3.0.jar')

    from('build/outputs/aar')
    into ('release/')
    include('app-release.aar')
    rename('app-release.aar', 'mahalsdk-1.3.0.aar')
}
exportRoot.dependsOn(deleteOldJar, build)

專案應用設定

需於專案gradle 新增如下藍色部份

repositories {
    flatDir {
        dirs 'libs'
    }
}
dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    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'
    //implementation files('libs/mahalsdk-1.3.0.jar')
    implementation (name:'mahalsdk-1.3.0', ext:'aar')
}