在使用 Android Gradle 插件 3.6.2 进行注释处理期间，Android R 类不可用

Question

我有一个库，它使用注释处理来创建用于在此处获取资源的 API:

https://github.com/Comcast/resourceprovider

我刚刚将 android gradle 插件从 3.2.1 更新到 3.6.2，突然在注释处理轮次中找不到 R 类。

查找 R 类的代码在 process 函数中:

@Override
public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
    for (Element annotatedElement : roundEnv.getElementsAnnotatedWith(RpApplication.class)) {

        // annotation is only allowed on classes, so we can safely cast here
        TypeElement annotatedClass = (TypeElement) annotatedElement;
        if (!isValidClass(annotatedClass)) {
            continue;
        }

        try {
            List<String> rStringVars = new ArrayList<>();
            List<String> rPluralVars = new ArrayList<>();
            List<String> rDrawableVars = new ArrayList<>();
            List<String> rDimenVars = new ArrayList<>();
            List<String> rIntegerVars = new ArrayList<>();
            List<String> rColorVars = new ArrayList<>();
            List<String> rIdVars = new ArrayList<>();

            //lame.  this assumes that the application class is at the top level.  find a better way.
            String packageName = getPackageName(processingEnv.getElementUtils(), annotatedClass);
            String rClassName = packageName + R_CLASS_IDENTIFIER;

            boolean generateIdProvider = annotatedElement.getAnnotation(RpApplication.class).generateIdProvider();
            boolean generateStringProvider = annotatedElement.getAnnotation(RpApplication.class).generateStringProvider();
            boolean generateColorProvider = annotatedElement.getAnnotation(RpApplication.class).generateColorProvider();
            boolean generateDrawableProvider = annotatedElement.getAnnotation(RpApplication.class).generateDrawableProvider();
            boolean generateIntegerProvider = annotatedElement.getAnnotation(RpApplication.class).generateIntegerProvider();
            boolean generateDimensionProvider = annotatedElement.getAnnotation(RpApplication.class).generateDimensionProvider();
            roundEnv.getRootElements().stream().filter(element -> element instanceof TypeElement).forEach(element -> {
                TypeElement typeElement = (TypeElement) element;
                if (typeElement.getQualifiedName().toString().equals(rClassName)) {......}

我从来没有进入那个街区。 Android Gradle Plugin 3.5.0 一切正常。

任何帮助，将不胜感激。

Answer 1

如问题所述:https://issuetracker.google.com/issues/153964091

暂时可以使用android.generateRJava=true强制生成 R 类。但是，这将在 AGP 4.1 中删除