Retrofit2 使用记录

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本文介绍如何使用Retrofit2实现API调用，包括依赖配置、创建客户端、定义接口及回调处理等核心步骤。

Retrofit2 基本使用参考

build.gradle 中添加依赖：

compile 'com.squareup.retrofit2:retrofit:2.1.0'
compile 'com.squareup.okhttp3:logging-interceptor:+'
compile 'com.squareup.retrofit2:converter-gson:2+'

基于 Retrofit Api 封装

public class RetrofitManager {

    private Retrofit retrofit;
    private String host = "http://gank.io/api/";
    private static final long TIMEOUT = 15L;

    private void setRestAdapter() {
        this.retrofit = (new Retrofit.Builder())
                .baseUrl(host)
                .client(createOkHttpClient())
                .addConverterFactory(GsonConverterFactory.create())
                .build();
    }

    private OkHttpClient createOkHttpClient() {

        HttpLoggingInterceptor httpLoggingInterceptor = new HttpLoggingInterceptor();
        httpLoggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
        OkHttpClient client = new OkHttpClient.Builder()
                .connectTimeout(TIMEOUT, TimeUnit.SECONDS)//设置超时时间
                .readTimeout(TIMEOUT, TimeUnit.SECONDS)
                .writeTimeout(TIMEOUT, TimeUnit.SECONDS)
                .retryOnConnectionFailure(true)//设置出现错误进行重新连接。
                .addInterceptor(httpLoggingInterceptor)  //拦截器
                .build();
        return client;
    }

    public Retrofit returnRetrofit() {
        return this.retrofit;
    }

    public RetrofitManager(){
        this.setRestAdapter();
    }

}

public class RetrofitAdapterManager extends RetrofitManager {

    private static RetrofitAdapterManager retrofitAdapterManager;

    private RetrofitAdapterManager (){
        super();
    }

    public static RetrofitAdapterManager getInstance() {

        if (null == retrofitAdapterManager) {
            synchronized (RetrofitAdapterManager.class) {
                if (null == retrofitAdapterManager) {
                    retrofitAdapterManager = new RetrofitAdapterManager();
                }
            }
        }
        return retrofitAdapterManager;
    }

    public static <T> T getRestApi(Class<T> apiInterface) {
        return getInstance().returnRetrofit().create(apiInterface);
    }

}

项目中使用

 RetrofitAdapterManager.getRestApi(Api.class).getAll().enqueue(new Callback<ResponseBody>() {
            @Override
            public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {

            }

            @Override
            public void onFailure(Call<ResponseBody> call, Throwable t) {

            }
        });

Github项目地址