java之apt学习

新建modue: java_apt

在build.gradle添加下面内容:

implementation 'com.google.auto.service:auto-service:1.0.1'
annotationProcessor 'com.google.auto.service:auto-service:1.0.1'

新建类BaseProcessor继承AbstractProcessor

import com.google.auto.service.AutoService;

import javax.annotation.processing.*;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.TypeElement;
import java.util.Set;
@AutoService(Processor.class)
@SupportedAnnotationTypes("sunrise.annotation.Hello")
public class BaseProcessor extends AbstractProcessor {

    @Override
    public synchronized void init(ProcessingEnvironment env) {
        System.out.println("sadasdasdsad");
    }

    @Override
    public boolean process(Set<? extends TypeElement> annoations, RoundEnvironment env) {
        System.out.println("sadasdasdsadasdasdasddsad");

        return true;
    }
}

然后在最外层的build.gradle添加下面内容:

annotationProcessor(project(":java_apt"))

这个时候build下我们的工程:会看到生成下面这些内容:

这就是使用这种方法的好处,他会自动帮你生成这些文件.