Android Gradle 实现与 CompileOnly 性能

Android Gradle Implementation vs CompileOnly Performance(Android Gradle 实现与 CompileOnly 性能)

问题描述

性能?

我认为 api 需要更多内存，因为 gradle 将快照该 transitive module 中的每个类，反之亦然implementation 是首选配置，因为(如上所述)它用于自己的内部实现.

The docs mention that implementation provides significant build time improvements over compile/api. What about compileOnly?

My use case is a multi-module (sorry I don't like Gradle's multi-project terminology) project, where I have an Android app, and multiple libraries that the app depends on (implementation). Some of the libraries also depend on one another. Should I use implementation or compileOnly when declaring dependencies in the library modules? My app module will be using implementation to depend on those artifacts, so I don't need them to be transitive through the library modules.

The api configuration should be used for dependencies that are exported to external modules (transitive dependency). Vice-Versa implementation configuration should be used for dependencies that are internal to the component (not transitive dependency).

implementation vs compileOnly:

There is no similarity in their job, compileOnly is

• a configuration inherited from java-plugin
• required at compile time
• also not included in the runtime classpath or exposed to dependent projects.

So compileOnly doesn't replace the implementation configuration job e.g:

implementation 'com.android.support:appcompat-v7:25.1.0' // can't use compileOnly here
testCompile 'junit:junit:4.12'

compile "com.google.dagger:dagger:2.8" // can't use here also
annotationProcessor "com.google.dagger:dagger-compiler:2.8" // can't use here also
compileOnly 'javax.annotation:jsr250-api:1.0' // we can use compileOnly here because it's required on run time only.

Since your case is a "multi-module", you have to use the api configuration, until you reach the final module it's better to use implementation.

Following graph describe those configurations:

Performance?

I think api requires more memory because gradle will snapshot every class in that transitive module, vice versa implementation is a preferred configuration because (as mentioned above) it's used for its own internal implementations.

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