AndroidStudio配置 noArg和allOpen插件

1.java中有一个常用的类是javabean，一般情况下需要有一个无参的构造函数,并且里面的参数不能用final来修饰，我们新建一个类作为例子：

public class GameBean {
    int gameId;
    String gameName;

    public int getGameId() {
        return gameId;
    }

    public void setGameId(int gameId) {
        this.gameId = gameId;
    }

    public String getGameName() {
        return gameName;
    }

    public void setGameName(String gameName) {
        this.gameName = gameName;
    }

    public GameBean() {
    }
}

2.在kotlin中呢，很简单我们这样写这个类

 class GameBeanKotlin(var gid: Int, var gname: String)

3.在kotlin中的使用

 fun main(args: Array) {
    val myGame=GameBeanKotlin(1,"吃鸡")
  println(myGame)// 运行结果 GameBeanKotlin(gid=1, gname=吃鸡)
    println(myGame.component1())// 运行结果  1
    println(myGame.component2())//运行结果  吃鸡
}

4.在kotlin中运行时没有问题的：我们看一下kotlin的字符码

@Metadata(
   mv = {1, 1, 16},
   bv = {1, 0, 3},
   k = 1,
   d1 = {"\u0000 \n\u0002\u0018\u0002\n\u0002\u0010\u0000\n\u0000\n\u0002\u0010\b\n\u0000\n\u0002\u0010\u000e\n\u0002\b\r\n\u0002\u0010\u000b\n\u0002\b\u0004\b\u0086\b\u0018\u00002\u00020\u0001B\u0015\u0012\u0006\u0010\u0002\u001a\u00020\u0003\u0012\u0006\u0010\u0004\u001a\u00020\u0005¢\u0006\u0002\u0010\u0006J\t\u0010\u000f\u001a\u00020\u0003HÆ\u0003J\t\u0010\u0010\u001a\u00020\u0005HÆ\u0003J\u001d\u0010\u0011\u001a\u00020\u00002\b\b\u0002\u0010\u0002\u001a\u00020\u00032\b\b\u0002\u0010\u0004\u001a\u00020\u0005HÆ\u0001J\u0013\u0010\u0012\u001a\u00020\u00132\b\u0010\u0014\u001a\u0004\u0018\u00010\u0001HÖ\u0003J\t\u0010\u0015\u001a\u00020\u0003HÖ\u0001J\t\u0010\u0016\u001a\u00020\u0005HÖ\u0001R\u001a\u0010\u0002\u001a\u00020\u0003X\u0086\u000e¢\u0006\u000e\n\u0000\u001a\u0004\b\u0007\u0010\b\"\u0004\b\t\u0010\nR\u001a\u0010\u0004\u001a\u00020\u0005X\u0086\u000e¢\u0006\u000e\n\u0000\u001a\u0004\b\u000b\u0010\f\"\u0004\b\r\u0010\u000e¨\u0006\u0017"},
   d2 = {"Lcom/stone/mykotlin/seven/GameBeanKotlin;", "", "gid", "", "gname", "", "(ILjava/lang/String;)V", "getGid", "()I", "setGid", "(I)V", "getGname", "()Ljava/lang/String;", "setGname", "(Ljava/lang/String;)V", "component1", "component2", "copy", "equals", "", "other", "hashCode", "toString", "app_debug"}
)
public final class GameBeanKotlin {
   private int gid;
   @NotNull
   private String gname;

   public final int getGid() {
      return this.gid;
   }

   public final void setGid(int var1) {
      this.gid = var1;
   }

   @NotNull
   public final String getGname() {
      return this.gname;
   }

   public final void setGname(@NotNull String var1) {
      Intrinsics.checkParameterIsNotNull(var1, "");
      this.gname = var1;
   }

   public GameBeanKotlin(int gid, @NotNull String gname) {
      Intrinsics.checkParameterIsNotNull(gname, "gname");
      super();
      this.gid = gid;
      this.gname = gname;
   }

   public final int component1() {
      return this.gid;
   }

   @NotNull
   public final String component2() {
      return this.gname;
   }

   @NotNull
   public final GameBeanKotlin copy(int gid, @NotNull String gname) {
      Intrinsics.checkParameterIsNotNull(gname, "gname");
      return new GameBeanKotlin(gid, gname);
   }

   // $FF: synthetic method
   public static GameBeanKotlin copy$default(GameBeanKotlin var0, int var1, String var2, int var3, Object var4) {
      if ((var3 & 1) != 0) {
         var1 = var0.gid;
      }

      if ((var3 & 2) != 0) {
         var2 = var0.gname;
      }

      return var0.copy(var1, var2);
   }

   @NotNull
   public String toString() {
      return "GameBeanKotlin(gid=" + this.gid + ", gname=" + this.gname + ")";
   }

   public int hashCode() {
      int var10000 = this.gid * 31;
      String var10001 = this.gname;
      return var10000 + (var10001 != null ? var10001.hashCode() : 0);
   }

   public boolean equals(@Nullable Object var1) {
      if (this != var1) {
         if (var1 instanceof GameBeanKotlin) {
            GameBeanKotlin var2 = (GameBeanKotlin)var1;
            if (this.gid == var2.gid && Intrinsics.areEqual(this.gname, var2.gname)) {
               return true;
            }
         }

         return false;
      } else {
         return true;
      }
   }
}
// GameKotlinKt.java
package com.stone.mykotlin.seven;

import kotlin.Metadata;
import kotlin.jvm.internal.Intrinsics;
import org.jetbrains.annotations.NotNull;

@Metadata(
   mv = {1, 1, 16},
   bv = {1, 0, 3},
   k = 2,
   d1 = {"\u0000\u0014\n\u0000\n\u0002\u0010\u0002\n\u0000\n\u0002\u0010\u0011\n\u0002\u0010\u000e\n\u0002\b\u0002\u001a\u0019\u0010\u0000\u001a\u00020\u00012\f\u0010\u0002\u001a\b\u0012\u0004\u0012\u00020\u00040\u0003¢\u0006\u0002\u0010\u0005¨\u0006\u0006"},
   d2 = {"main", "", "args", "", "", "([Ljava/lang/String;)V", "app_debug"}
)
public final class GameKotlinKt {
   public static final void main(@NotNull String[] args) {
      Intrinsics.checkParameterIsNotNull(args, "args");
      GameBeanKotlin myGame = new GameBeanKotlin(1, "吃鸡");
      boolean var2 = false;
      System.out.println(myGame);
      int var4 = myGame.component1();
      boolean var3 = false;
      System.out.println(var4);
      String var5 = myGame.component2();
      var3 = false;
      System.out.println(var5);
   }
}

可以看到类和get以及set方法前面都一个final修饰，不可以被继承，所以我们需要安装官方提供的两个插件noArg和allOpen来解决这个问题

5.项目跟目录的build.gradle

buildscript {
    ext.kotlin_version = '1.3.72'
    ext.butterknife_version='10.2.1'
    repositories {
        google()
        jcenter()
        
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.6.1'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath "com.jakewharton:butterknife-gradle-plugin:$butterknife_version"

        classpath "org.jetbrains.kotlin:kotlin-noarg:$kotlin_version"
        classpath "org.jetbrains.kotlin:kotlin-allopen:$kotlin_version"


        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

6.app的 build.gradle文件

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-kapt'
apply plugin: 'kotlin-android-extensions'
//下面这两行才是
apply plugin: 'kotlin-noarg'
apply plugin: 'kotlin-allopen'

7.在app的项目里面新建一个文件（或者是新的包）,名字随意定义

noargallopen.png

8.app的 build.gradle文件中

android {
...
   noArg {
        annotation("com.stone.mykotlin.anNoArgAllOpen")
    }

    allOpen {
        annotation("com.stone.mykotlin.anNoArgAllOpen")
    }
}

9，sync now

10.在kotlin的bean类上

@NoArgAllOpen
data class GameBeanKotlin(var gid: Int, var gname: String)

11.clean 项目，重新查看kotlin字符码

@NoargAllopen
@Metadata(
   mv = {1, 1, 16},
   bv = {1, 0, 3},
   k = 1,
   d1 = {"\u0000 \n\u0002\u0018\u0002\n\u0002\u0010\u0000\n\u0000\n\u0002\u0010\b\n\u0000\n\u0002\u0010\u000e\n\u0002\b\r\n\u0002\u0010\u000b\n\u0002\b\u0004\b\u0097\b\u0018\u00002\u00020\u0001B\u0015\u0012\u0006\u0010\u0002\u001a\u00020\u0003\u0012\u0006\u0010\u0004\u001a\u00020\u0005¢\u0006\u0002\u0010\u0006J\t\u0010\u000f\u001a\u00020\u0003HÆ\u0003J\t\u0010\u0010\u001a\u00020\u0005HÆ\u0003J\u001d\u0010\u0011\u001a\u00020\u00002\b\b\u0002\u0010\u0002\u001a\u00020\u00032\b\b\u0002\u0010\u0004\u001a\u00020\u0005HÆ\u0001J\u0013\u0010\u0012\u001a\u00020\u00132\b\u0010\u0014\u001a\u0004\u0018\u00010\u0001HÖ\u0003J\t\u0010\u0015\u001a\u00020\u0003HÖ\u0001J\t\u0010\u0016\u001a\u00020\u0005HÖ\u0001R\u001a\u0010\u0002\u001a\u00020\u0003X\u0096\u000e¢\u0006\u000e\n\u0000\u001a\u0004\b\u0007\u0010\b\"\u0004\b\t\u0010\nR\u001a\u0010\u0004\u001a\u00020\u0005X\u0096\u000e¢\u0006\u000e\n\u0000\u001a\u0004\b\u000b\u0010\f\"\u0004\b\r\u0010\u000e¨\u0006\u0017"},
   d2 = {"Lcom/stone/mykotlin/seven/GameBeanKotlin;", "", "gid", "", "gname", "", "(ILjava/lang/String;)V", "getGid", "()I", "setGid", "(I)V", "getGname", "()Ljava/lang/String;", "setGname", "(Ljava/lang/String;)V", "component1", "component2", "copy", "equals", "", "other", "hashCode", "toString", "app_debug"}
)
public class GameBeanKotlin {
   private int gid;
   @NotNull
   private String gname;

   public int getGid() {
      return this.gid;
   }

   public void setGid(int var1) {
      this.gid = var1;
   }

   @NotNull
   public String getGname() {
      return this.gname;
   }

   public void setGname(@NotNull String var1) {
      Intrinsics.checkParameterIsNotNull(var1, "");
      this.gname = var1;
   }

   public GameBeanKotlin(int gid, @NotNull String gname) {
      Intrinsics.checkParameterIsNotNull(gname, "gname");
      super();
      this.gid = gid;
      this.gname = gname;
   }

   public final int component1() {
      return this.getGid();
   }

   @NotNull
   public final String component2() {
      return this.getGname();
   }

   @NotNull
   public final GameBeanKotlin copy(int gid, @NotNull String gname) {
      Intrinsics.checkParameterIsNotNull(gname, "gname");
      return new GameBeanKotlin(gid, gname);
   }

   // $FF: synthetic method
   public static GameBeanKotlin copy$default(GameBeanKotlin var0, int var1, String var2, int var3, Object var4) {
      if (var4 != null) {
         throw new UnsupportedOperationException("Super calls with default arguments not supported in this target, function: copy");
      } else {
         if ((var3 & 1) != 0) {
            var1 = var0.getGid();
         }

         if ((var3 & 2) != 0) {
            var2 = var0.getGname();
         }

         return var0.copy(var1, var2);
      }
   }

   @NotNull
   public String toString() {
      return "GameBeanKotlin(gid=" + this.getGid() + ", gname=" + this.getGname() + ")";
   }

   public int hashCode() {
      int var10000 = this.getGid() * 31;
      String var10001 = this.getGname();
      return var10000 + (var10001 != null ? var10001.hashCode() : 0);
   }

   public boolean equals(@Nullable Object var1) {
      if (this != var1) {
         if (var1 instanceof GameBeanKotlin) {
            GameBeanKotlin var2 = (GameBeanKotlin)var1;
            if (this.getGid() == var2.getGid() && Intrinsics.areEqual(this.getGname(), var2.getGname())) {
               return true;
            }
         }

         return false;
      } else {
         return true;
      }
   }

   public GameBeanKotlin() {
   }
}
// GameKotlinKt.java
package com.stone.mykotlin.seven;

import kotlin.Metadata;
import kotlin.jvm.internal.Intrinsics;
import org.jetbrains.annotations.NotNull;

@Metadata(
   mv = {1, 1, 16},
   bv = {1, 0, 3},
   k = 2,
   d1 = {"\u0000\u0014\n\u0000\n\u0002\u0010\u0002\n\u0000\n\u0002\u0010\u0011\n\u0002\u0010\u000e\n\u0002\b\u0002\u001a\u0019\u0010\u0000\u001a\u00020\u00012\f\u0010\u0002\u001a\b\u0012\u0004\u0012\u00020\u00040\u0003¢\u0006\u0002\u0010\u0005¨\u0006\u0006"},
   d2 = {"main", "", "args", "", "", "([Ljava/lang/String;)V", "app_debug"}
)
public final class GameKotlinKt {
   public static final void main(@NotNull String[] args) {
      Intrinsics.checkParameterIsNotNull(args, "args");
      GameBeanKotlin myGame = new GameBeanKotlin(1, "吃鸡");
      boolean var2 = false;
      System.out.println(myGame);
      int var4 = myGame.component1();
      boolean var3 = false;
      System.out.println(var4);
      String var5 = myGame.component2();
      var3 = false;
      System.out.println(var5);
   }
}

现在看已经没有final了

现在看，第一次安装插件可能有些麻烦，但是后面的bean对象，完全不用写get和set方法了，也不用写无参构造函数了，还是挺省劲的。这个是全局通用的。

好了，祝大家学习，工作，生活都开心。欢迎留言。。