一、Lombok是什么？

如果想自己完成从官网学习可以点击：https://projectlombok.org/。功能和AutoValue很类似。使用Lombok可以方便的生成setter、getter、equals、hashcode、toString等方法，代码看起来十分的优雅。

二、Android上如何集成

1.工程下面新建lombok.config文件。文件内容是：

lombok.anyConstructor.suppressConstructorProperties=true

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2.在app的build.gradle中添加依赖：

dependencies {
    ```
    compileOnly "org.projectlombok:lombok:1.16.18"
    implementation 'org.glassfish:javax.annotation:10.0-b28'
}

3.在Android Studio中安装lombok插件

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4.错误修复

javaCompileOptions { annotationProcessorOptions { includeCompileClasspath = true } }

image.png

三、使用

通过上面的步骤，就已经在Android Studio中集成好了Lombok，接下来就是使用。可以有哪些关键字注解可以参考官方文档：https://projectlombok.org/features/all

val

Finally! Hassle-free final local variables.

var

Mutably! Hassle-free local variables.

@NonNull

or: How I learned to stop worrying and love the NullPointerException.

@Cleanup

Automatic resource management: Call your close() methods safely with no hassle.

@Getter/@Setter

Never write public int getFoo() {return foo;} again.

@ToString

No need to start a debugger to see your fields: Just let lombok generate a toString for you!

@EqualsAndHashCode

Equality made easy: Generates hashCode and equals implementations from the fields of your object..

@NoArgsConstructor, @RequiredArgsConstructor and @AllArgsConstructor

Constructors made to order: Generates constructors that take no arguments, one argument per final / non-nullfield, or one argument for every field.

@Data

All together now: A shortcut for @ToString, @EqualsAndHashCode, @Getter on all fields, and @Setter on all non-final fields, and @RequiredArgsConstructor!

@Value

Immutable classes made very easy.

@Builder

... and Bob's your uncle: No-hassle fancy-pants APIs for object creation!

@SneakyThrows

To boldly throw checked exceptions where no one has thrown them before!

@Synchronized

synchronized done right: Don't expose your locks.

@With

Immutable 'setters' - methods that create a clone but with one changed field.

@Getter(lazy=true)

Laziness is a virtue!

@Log

Captain's Log, stardate 24435.7: "What was that line again?"

experimental

Head to the lab: The new stuff we're working on.

但是上面的很多注解不是我使用的初衷，例如@NonNull这种Android的support包里面都有。我想用的是@Data这种的。比如我写了一个实体类，我可以加个注解就生成了get/set/tostring/构造函数等。

package com.stormdzh.androidlombok.entity;
import lombok.Data;
/**
 * @Description: 测试实体类
 * @Author: dzh
 * @CreateDate: 2020-11-29 22:05
 */
@Data
public class User {
    private String name;
    private String avatar;

}

上面的代码加个@Data注解之后，就有有了以下的方法，这就很方便了。

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四、总结

集成和简单使用已经总结了，其余的那些关键字可以看看官方的文档。有特殊的需求可以在研究下，官网上也有很多实例代码。