問(wèn)題描述

我們正在制作一些庫(kù)，主要是為了我們的 API，我們將使我們的外部開(kāi)發(fā)人員的生活更輕松.

We're making some library, basicly for our API, that we would make life easier for our external developers.

所以我們創(chuàng)建了新的庫(kù)項(xiàng)目，并將 Retrofit 和其他一些庫(kù)作為依賴(lài)項(xiàng).

So we created new library project and put Retrofit and some other libraries as dependencies.

dependencies {
    compile 'com.android.support:appcompat-v7:23.3.0'
    compile 'com.google.code.gson:gson:2.6.2'
    compile 'com.squareup.retrofit2:retrofit:2.0.1'
    compile 'com.squareup.retrofit2:converter-gson:2.0.1'
    compile 'com.squareup.okhttp3:okhttp:3.2.0'
}

現(xiàn)在當(dāng)我們構(gòu)建它時(shí)，它會(huì)生成 aar 文件.

Now when we build it, it produces aar file.

但是現(xiàn)在當(dāng)我們把 aar 文件放到 libs 目錄并設(shè)置為依賴(lài)時(shí)，我們?nèi)匀恍枰谟脩?hù)的 build.gradle 中放入相同的依賴(lài) 文件，這很糟糕.應(yīng)該是從圖書(shū)館拿的吧?

But now when we put the aar file to libs directory and set it as dependency, we still have to put the same dependency in user's build.gradle file, which sucks. It should be taken from the library, right?

repositories {
    flatDir {
        dirs 'libs'
    }
}

dependencies {
    compile(name: 'ourlibrary', ext: 'aar') {
        transitive = true;
    }
}

如何使 transitive = true 工作?

推薦答案

aar 文件不包含嵌套的(或 transitive) 依賴(lài)項(xiàng) 并且沒(méi)有描述所使用的依賴(lài)項(xiàng)的 pom 文件圖書(shū)館.

The aar file doesn't contain the nested (or transitive) dependencies and doesn't have a pom file which describes the dependencies used by the library.

這意味著，如果您使用 flatDir 存儲(chǔ)庫(kù)導(dǎo)入 aar 文件，您還必須在項(xiàng)目中指定依賴(lài)項(xiàng).

It means that, if you are importing a aar file using a flatDir repo you have to specify the dependencies also in your project.

在您的情況下，由于上述原因，添加 transitive=true 并不能解決您的問(wèn)題.

In your case adding transitive=true doesn't resolve your issue for the reason described above.

您應(yīng)該使用 ma??ven 存儲(chǔ)庫(kù)(您必須在私有或公共 maven 存儲(chǔ)庫(kù)中發(fā)布庫(kù))，您不會(huì)遇到同樣的問(wèn)題.
在這種情況下，gradle 使用 pom 文件下載依賴(lài)項(xiàng)，該文件將包含依賴(lài)項(xiàng)列表.

You should use a maven repository (you have to publish the library in a private or public maven repo), you will not have the same issue.
In this case, gradle downloads the dependencies using the pom file which will contains the dependencies list.

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