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RePlugin 插件共享宿主的Retrofit实例

RePlugin 插件共享宿主的Retrofit实例

作者: 浩运 | 来源:发表于2017-11-07 18:11 被阅读0次

    最近在学习使用RePlugin,在考虑代码分层时,基本的网络请求要怎么共享,不管是宿主还是插件,对应的Retrofit实例和OKHTTP实例应该只有一个才对,如果每个app中一个单独的实例是可行,但是占用资源。

    使用共享lib的方式来实现

    网络层comm_net: 通过Retrofit2+Rxjava2+Dagger2来实现

    HttpResult:数据返回的通用数据结构定义

    package com.lehow.comm.net;
    
    public class HttpResult<T> {
    
        public int code;
        public String msg;
    
        public T data;
        public Boolean error;
        public String token;
        public int userId;
    
        @Override
        public String toString() {
            return "BaseBean{" +
                    "code=" + code +
                    ", message='" + msg + '\'' +
                    ", data=" + data +
                    ", error=" + error +
                    ", token=" + token +
                    ", userId=" + userId +
                    '}';
        }
    }
    
    

    NetModule:提供Retrofit实例

    @Module
    public class NetModule {
      private String API_HOST_URL;
    
      public NetModule(String API_HOST_URL) {
        this.API_HOST_URL = API_HOST_URL;
      }
    
    
      @Provides @Singleton public Retrofit provideRetrofit() {
        Retrofit.Builder builder = new Retrofit.Builder().baseUrl(API_HOST_URL)
            .addConverterFactory(GsonConverterFactory.create())
            .addCallAdapterFactory(RxJava2CallAdapterFactory.create());
        return builder
            .build();
      }
    }
    
    

    NetComponent:暴露DI接口

    @Singleton
    @Component(modules = NetModule.class)
    public interface NetComponent {
        Retrofit getRetrofitInstance();
    }
    
    

    build文件,主要看dependencies的定义。由于rxandroid只有app模块中才会用,就不在基础的网络层去提供了,没价值而且会有依赖冲突

    dependencies {
      implementation fileTree(include: ['*.jar'], dir: 'libs')
      implementation 'com.google.dagger:dagger:2.12'
      annotationProcessor 'com.google.dagger:dagger-compiler:2.12'
      api 'com.squareup.retrofit2:retrofit:2.3.0'//暴露api,让依赖这个lib的项目可见
      implementation 'com.squareup.retrofit2:adapter-rxjava2:2.3.0'
      implementation 'com.squareup.retrofit2:converter-gson:2.3.0'
    //  api 'io.reactivex.rxjava2:rxandroid:2.0.1'
      api 'io.reactivex.rxjava2:rxjava:2.1.6'//指定RxJava的版本,并暴露api,让依赖这个lib的项目可见
    }
    

    当依赖了这些项目的时候,他们之前的依赖关系如下:

    image.png

    app(宿主)和plugina(插件)通过同样的接口请求

    public interface NetApiService {
    
    
      @GET("test/top-article") Observable<HttpResult<ArrayList<TopArticle>>> getTopArticle(
          @Query("publishTime") String publishTime, @Query("moveType") int moveType,
          @Query("limit") int limit);
    }
    
    public class TopArticle {
    
      public int id;
      public String title;
      public String publishTime;
      public String backGroundPic;
      public int readNum;
      public String shortContent;
      public String url;
      public String logo;
      public int concernNum;
      public String realName;
      public boolean isCollect;
      }
    

    两者的不同在各自的application和build中:

    app的定义:

    • MyApplication,注意其中的createNetService方法
    public class MyApplication extends RePluginApplication {
        private static final String TAG =MyApplication.class.getSimpleName() ;
    
        public static MyApplication instance;
    
        private Retrofit retrofitInstance;
        @Override public void onCreate() {
            super.onCreate();
            instance = this;
            retrofitInstance = DaggerNetComponent.builder()
                .netModule(new NetModule("http://192.168.10.224:7080/"))
                .build()
                .getRetrofitInstance();
        }
        public <T> T createNetService(final Class<T> service) {
            Log.i(TAG, "createNetService: retrofitInstance="+retrofitInstance);
            return retrofitInstance.create(service);
        }
    //省略部分无关代码
    }
    
    • build的dependencies
    dependencies {
        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'
        })
        compile('com.android.support:appcompat-v7:26.+', {
            exclude group: 'com.android.support', module: 'v4'
        })
        compile 'com.qihoo360.replugin:replugin-host-lib:2.2.1'
        testCompile 'junit:junit:4.12'
        implementation project(':comm_net')
        implementation 'io.reactivex.rxjava2:rxandroid:2.0.1'
    }
    

    plugina的定义:

    • MyApplication

    这里面通过反射拿到app的MyApplication对象的createNetService方法,并通过他在插件中创建定义的请求接口。

    public class MyApplication extends Application {
      private static final String TAG ="MyApplication" ;
      public static MyApplication instance;
    
    
      private Method createNetService;
    
      @Override protected void attachBaseContext(Context base) {
        super.attachBaseContext(base);
      }
    
      @Override public void onCreate() {
        super.onCreate();
        instance = this;
        //获取宿主的context,指向app的MyApplication对象
        Context hostContext = RePlugin.getHostContext();
        Class<? extends Context> aClass = hostContext.getClass();
        try {
          //反射拿到app中MyApplication对象的createNetService方法
          createNetService = aClass.getDeclaredMethod("createNetService", Class.class);
        } catch (NoSuchMethodException e) {
          e.printStackTrace();
        }
    
      }
    
      //返回Retrofit的接口对象
      public <T> T createNetService(final Class<T> service) {
        if (createNetService != null) {
          try {
            return (T) createNetService.invoke(RePlugin.getHostContext(), service);
          } catch (IllegalAccessException e) {
            e.printStackTrace();
          } catch (InvocationTargetException e) {
            e.printStackTrace();
          }
        }
        return null;
      }
      
      //省略部分无关代码
      }
    
    • build的dependencies
    dependencies {
      implementation 'com.qihoo360.replugin:replugin-plugin-lib:2.2.1'
      testImplementation 'junit:junit:4.12'
      implementation 'com.android.support:appcompat-v7:26.1.0'
      implementation project(':comm_net')
      implementation 'io.reactivex.rxjava2:rxandroid:2.0.1'
      }
    

    编译运行后,ap中请求ok,但是插件中直接崩溃了,报错如下:

    Caused by: java.lang.IllegalArgumentException: Unable to create call adapter for io.reactivex.Observable<com.lehow.comm.net.HttpResult<java.util.ArrayList<com.lehow.plugina.net.TopArticle>>>
       for method NetApiService.getTopArticle
       at retrofit2.ServiceMethod$Builder.methodError(ServiceMethod.java:752)
       at retrofit2.ServiceMethod$Builder.createCallAdapter(ServiceMethod.java:237)
       at retrofit2.ServiceMethod$Builder.build(ServiceMethod.java:162)
       at retrofit2.Retrofit.loadServiceMethod(Retrofit.java:170)
       at retrofit2.Retrofit$1.invoke(Retrofit.java:147)
       at java.lang.reflect.Proxy.invoke(Proxy.java:393)
       at $Proxy0.getTopArticle(Unknown Source)
       at com.lehow.plugina.MainActivity.btnGetTop(MainActivity.java:68)
        ... 11 more
    Caused by: java.lang.IllegalArgumentException: Could not locate call adapter for io.reactivex.Observable<com.lehow.comm.net.HttpResult<java.util.ArrayList<com.lehow.plugina.net.TopArticle>>>.
     Tried:
      * retrofit2.adapter.rxjava2.RxJava2CallAdapterFactory
      * retrofit2.ExecutorCallAdapterFactory
       at retrofit2.Retrofit.nextCallAdapter(Retrofit.java:241)
       at retrofit2.Retrofit.callAdapter(Retrofit.java:205)
       at retrofit2.ServiceMethod$Builder.createCallAdapter(ServiceMethod.java:235)
        ... 17 more
    

    Retrofit在使用RxJava2CallAdapterFactory转换Observable时失败了,找不匹配的转换器。

    明明存在为啥找不到,怀疑是依赖class找不到

    断点调试查看版本和路径

    • APP中的信息
    image.png
    • plugina中的信息


      image.png

    returnType 的 io.reactivex.Observable 路径是不一样的。

    所以需要移除插件里面的Observable,让它去吸附宿主里面的路径。

    • 于是调整 plugina的build,移除相关依赖
    
    dependencies {
      implementation 'com.qihoo360.replugin:replugin-plugin-lib:2.2.1'
      //  implementation fileTree(include: ['*.jar'], dir: 'libs')
      testImplementation 'junit:junit:4.12'
      implementation 'com.android.support:appcompat-v7:26.1.0'
      implementation project(':comm_net')
      //  implementation 'io.reactivex.rxjava2:rxandroid:2.0.1'
      compileOnly files('libs/rxandroid-2.0.1.jar')
      //  implementation files('libs/retrofit-2.3.0.jar')
    }
    //相当于compileOnly
    android.applicationVariants.all { variant ->
        //移除从comm_net中来的retrofit2
      variant.getRuntimeConfiguration().exclude group: 'com.squareup.retrofit2'
      //移除从comm_net中的rxjava2
      variant.getRuntimeConfiguration().exclude group: 'io.reactivex.rxjava2'
    
    }
    

    注意compileOnly只能用在jar上,所以要把rxandroid.aar中的jar包提取出来,才能用。而且移除了Rxjava和Retrofit的依赖。

    • 同时要记得去app的MyApplication中去开启setUseHostClassIfNotFound(true),否则plugina中会找不到Retrofit和RxJava
    image.png

    或许你会纳闷为啥要把rxandroid抽成jar,并compileOnly,而不能直接implementation,然后单独移除Rxjava勒? 下面有图为证

    image.png

    编译会报错,提示不能把rxandroid作为仅编译时使用,记得上面的那个依赖图么,rxandroid依赖了Rxjava,现在釜底抽薪了,然后有要编译打包rxandroid,风险太高,系统自然不干。

    看似简简单的几行代码,折腾了我一周的时间去各种验证和调整写法,心塞塞的。

    在编译app是指定同时要编译的plugin插件,方便团队成员快速调试验证自己开发的插件,可以在app的build中添加如下的脚本

    
    def moduleName=[':plugina']
    
    afterEvaluate {
        android.buildTypes.all{ buildType ->
            println 'buildType='+buildType
            println 'buildType capitalize='+buildType.name.capitalize()
            moduleName.each {curMName->
                    println 'TTT='+"${curMName}:assemble${buildType.name.capitalize()}"
                curMName=curMName.replace(':','')
                def subAssemble=rootProject.project(curMName).tasks.
                    getByPath(":$curMName:assemble${buildType.name.capitalize()}")
                subAssemble.doLast {
                    println '==doLast=='
                    copy{
                        from "../$curMName/build/outputs/apk/$buildType.name/$curMName-${buildType.name}.apk"
                        into "/src/main/assets/plugins/"
                        rename("$curMName-${buildType.name}.apk","${curMName}.jar")
                    }
                }
                def preAssemble=tasks.getByPath(":${project.name}:pre${buildType.name.capitalize()}Build")
                //assemble 前,先卸载对应版本,防止Replugin 插件的改动不更新
                tasks.getByPath(":${project.name}:assemble${buildType.name.capitalize()}").dependsOn "uninstall${buildType.name.capitalize()}"
                preAssemble.dependsOn subAssemble
            }
        }
    }
    

    moduleName指定了一个参与编译的插件数组,在准备好的时候,会将app的 preXX编译依赖到插件的assembleXX任务上,同时插件的assembleXX会在编译完后,将自己拷贝到app的assert目录下,并重命名。同时在app的 assembleXX编译前,先从手机上卸载掉老版本,防止Replugin的插件不更新。

    后续完善

    1. 优化上面的编译脚本,多个插件可以方便的指定编译一个
    2. 将comm_net封装成单独的插件,供app和plugina使用。
    3. 插件在编译的时候,Replugin插件会自动uzip依赖的的各种lib,编译相当的慢,这里可以把插件中共用的无关的lib全部移除掉,反正宿主会提供,比如support包
    4. 插件作用独立app编译与作为插件时的dependence动态适应,不用手动去改

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