库模块不包含 Android 中的依赖项

Question

I am working on a multi-module project and this project should have a Java Library module called test-shared to provide common test classes. However, I am facing an issue in which my module doesn't recognize dependencies and I cannot write my classes.

Things have been done

1. Enable offline mode and disable again.
2. Delete .gradle folder and sync.
3. Googled identical issues.
4. Invalidate cache & restart.

As a result, I don't have a working project. Your help would be welcome.

build.gradle

apply plugin: 'java-library'

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])

    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-test:1.3.2"
    implementation "androidx.test:rules:1.2.0"
    implementation "androidx.lifecycle:lifecycle-runtime:2.1.0"
    implementation "androidx.lifecycle:lifecycle-extensions:2.1.0"
    implementation "androidx.lifecycle:lifecycle-livedata-ktx:2.1.0"
}

sourceCompatibility = "8"
targetCompatibility = "8"

Example class

class Co {

    val a = LiveData<Co>()
    val b = Observer<Co>()
}

In this example, neither LiveData nor Observer are recognized. Could you please help me fix this weird issue?

Thanks,

Answer 1

If this is not the entirety of your library's gradle file, then you are missing the android plugins.

Please add the following at the top of your library's gradle file.

apply plugin: "com.android.library"

I will also recommend having a look at the documentation: https://developer.android.com/studio/projects/android-library