Android Room Persistence Library无法在库项目中运行

Question

我正在开发一个Android库,并希望在其中使用新的Android Room持久性库.但是,在启动时我收到了这个错误:

Caused by: java.lang.RuntimeException: cannot find implementation for MyLibraryName.Database.QSDatabase. QSDatabase_Impl does not exist at android.arch.persistence.room.Room.getGeneratedImplementation(Room.java:90)

这意味着annotationProcessor在编译期间不会生成额外的代码.

顺便说一句,当我将@Database代码放在app模块中时,一切正常.

我的gradle文件(库模块):

apply plugin: 'com.android.library'
apply plugin: 'groovyx.android'

buildscript {
repositories {
    jcenter()
    maven { url 'https://maven.google.com' }
}

dependencies {
    classpath 'com.android.tools.build:gradle:2.3.2'
    classpath 'org.codehaus.groovy:groovy-android-gradle-plugin:1.1.0'
}
}

android {
compileSdkVersion 25
buildToolsVersion "25.0.3"

defaultConfig {
    minSdkVersion 15
    targetSdkVersion 25
    versionCode 1
    versionName "1.0"
    configurations.all {
    resolutionStrategy.eachDependency { DependencyResolveDetails details ->
            def requested = details.requested
            if (requested.group == 'com.android.support') {
                if (!requested.name.startsWith("multidex")) {
                    details.useVersion '25.3.0'
                }
            }
        }
    }
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}
sourceSets { main { java.srcDirs = ['src/main/java', 'src/main/groovy'] } }
}

dependencies {

// google Room persistence library
compile "android.arch.persistence.room:runtime:1.0.0-alpha1"
annotationProcessor "android.arch.persistence.room:compiler:1.0.0-alpha1"

compile fileTree(include: ['*.jar'], dir: 'libs')
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', 
{
    exclude group: 'com.android.support', module: 'support-annotations'
})

// google location service
compile 'com.google.android.gms:play-services-location:10.2.4'

androidTestCompile 'junit:junit:4.12'
// Http
compile 'com.squareup.retrofit2:retrofit:2.3.0'
compile 'com.google.code.gson:gson:2.6.2'
compile 'com.squareup.retrofit2:converter-gson:2.3.0'
compile 'com.squareup.okhttp3:logging-interceptor:3.8.0'
compile 'com.squareup.retrofit2:converter-scalars:2.1.0'

// groovy
compile group: 'org.codehaus.groovy', name: 'groovy-all', version: '2.4.4'

}

Answer 1

@stevenwood 看来你对 groovy/ 的看法是对的

我有相同的项目结构。但就我而言，我在 groovy/ 中没有真正的 Groovy 代码。只有普通的旧 Java 代码。因此，通过进行以下更改，也许对我来说更容易让项目再次运行

删除/注释掉classpath 'org.codehaus.groovy:gradle-groovy-android-plugin:0.3.8' from the project's build.gradle

删除/注释掉apply plugin: 'groovyx.grooid.groovy-android' from the module's build.gradle

git mv groovy/ java/

至少从那以后，我就不再收到missing Database_ImplRoom 发来的消息了。