Android Retrofit 2.0 使用-补充篇

推荐阅读，猛戳：
1、Android MVP 实例
2、Android Retrofit 2.0使用
3、RxJava
4、RxBus
5、Android MVP+Retrofit+RxJava实践小结

之前分享的Android Retrofit 2.0 使用，属于基本的使用，实际开发还远远不够，因此对其补充，主要在Retrofit配置和接口参数。

Retrofit配置

添加依赖

app/build.gradle

 compile 'com.squareup.retrofit2:retrofit:2.0.2'

首先Builder()，得到OkHttpClient.Builder对象builder

 OkHttpClient.Builder builder = new OkHttpClient.Builder();

Log信息拦截器

Debug可以看到，网络请求，打印Log信息，发布的时候就不需要这些log
1、添加依赖
app/build.gradle

 compile 'com.squareup.okhttp3:logging-interceptor:3.1.2'

2、Log信息拦截器

if (BuildConfig.DEBUG) {
    // Log信息拦截器
    HttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor();
    loggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
    //设置 Debug Log 模式
    builder.addInterceptor(loggingInterceptor);
}

缓存机制

无网络时，也能显示数据

File cacheFile = new File(DemoApplication.getContext().getExternalCacheDir(), "WuXiaolongCache");
Cache cache = new Cache(cacheFile, 1024 * 1024 * 50);
Interceptor cacheInterceptor = new Interceptor() {
    @Override
    public Response intercept(Chain chain) throws IOException {
        Request request = chain.request();
        if (!AppUtils.networkIsAvailable(DemoApplication.getContext())) {
            request = request.newBuilder()
                    .cacheControl(CacheControl.FORCE_CACHE)
                    .build();
        }
        Response response = chain.proceed(request);
        if (AppUtils.networkIsAvailable(DemoApplication.getContext())) {
            int maxAge = 0;
            // 有网络时 设置缓存超时时间0个小时
            response.newBuilder()
                    .header("Cache-Control", "public, max-age=" + maxAge)
                    .removeHeader("WuXiaolong")// 清除头信息，因为服务器如果不支持，会返回一些干扰信息，不清除下面无法生效
                    .build();
        } else {
            // 无网络时，设置超时为4周
            int maxStale = 60 * 60 * 24 * 28;
            response.newBuilder()
                    .header("Cache-Control", "public, only-if-cached, max-stale=" + maxStale)
                    .removeHeader("nyn")
                    .build();
        }
        return response;
    }
};
builder.cache(cache).addInterceptor(cacheInterceptor);

公共参数

可能接口有某些参数是公共的，不可能一个个接口都去加吧

//公共参数
Interceptor addQueryParameterInterceptor = new Interceptor() {
    @Override
    public Response intercept(Chain chain) throws IOException {
        Request originalRequest = chain.request();
        Request request;
        String method = originalRequest.method();
        Headers headers = originalRequest.headers();
        HttpUrl modifiedUrl = originalRequest.url().newBuilder()
                // Provide your custom parameter here
                .addQueryParameter("platform", "android")
                .addQueryParameter("version", "1.0.0")              
                .build();
        request = originalRequest.newBuilder().url(modifiedUrl).build();
        return chain.proceed(request);
    }
};
//公共参数
builder.addInterceptor(addQueryParameterInterceptor);

设置头

有的接口可能对请求头要设置

Interceptor headerInterceptor = new Interceptor() {
    @Override
    public Response intercept(Chain chain) throws IOException {
        Request originalRequest = chain.request();
        Request.Builder requestBuilder = originalRequest.newBuilder()
                .header("AppType", "TPOS")
                .header("Content-Type", "application/json")
                .header("Accept", "application/json")
                .method(originalRequest.method(), originalRequest.body());
        Request request = requestBuilder.build();
        return chain.proceed(request);
    }
};
//设置头
builder.addInterceptor(headerInterceptor );

设置cookie

服务端可能需要保持请求是同一个cookie，主要看各自需求
1、app/build.gradle

 compile 'com.squareup.okhttp3:okhttp-urlconnection:3.2.0'

2、设置cookie

CookieManager cookieManager = new CookieManager();
cookieManager.setCookiePolicy(CookiePolicy.ACCEPT_ALL);
builder.cookieJar(new JavaNetCookieJar(cookieManager));

设置超时和重连

希望超时时能重连

 //设置超时
 builder.connectTimeout(15, TimeUnit.SECONDS);
 builder.readTimeout(20, TimeUnit.SECONDS);
 builder.writeTimeout(20, TimeUnit.SECONDS);
 //错误重连
 builder.retryOnConnectionFailure(true);

最后将这些配置设置给retrofit：

OkHttpClient okHttpClient = builder.build();
Retrofit retrofit = new Retrofit.Builder()
        .baseUrl(ApiStores.API_SERVER_URL)
        //设置 Json 转换器
        .addConverterFactory(GsonConverterFactory.create())
        //RxJava 适配器
        .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
        .client(okHttpClient)
        .build();

完整配置

public class AppClient {
    public static Retrofit retrofit = null;

    public static Retrofit retrofit() {
        if (retrofit == null) {
             OkHttpClient.Builder builder = new OkHttpClient.Builder();
            /**
             *设置缓存，代码略
             */
                      
            /**
             *  公共参数，代码略
             */
           
            /**
             * 设置头，代码略
             */           
           
             /**
             * Log信息拦截器，代码略
             */
            
             /**
             * 设置cookie，代码略
             */
            
             /**
             * 设置超时和重连，代码略
             */

            //以上设置结束，才能build(),不然设置白搭
            OkHttpClient okHttpClient = builder.build();

            retrofit = new Retrofit.Builder()
                    .baseUrl(ApiStores.API_SERVER_URL)                  
                    .client(okHttpClient)
                    .build();
        }
        return retrofit;

    }
}

接口参数

Path

类似这样链接：http://wuxiaolong.me/2016/01/15/retrofit/

 @GET("2016/01/15/{retrofit}")
 Call getData(@Path("retrofit") String retrofit);

即您传的参数retrofit内容会替换大括号里的内容。

Query

类似这样链接：http://wuxiaolong.me/v1?ip=202.202.33.33&name=WuXiaolong

@GET("v1")
Call getData(@Query("ip") String ip,@Query("name") String name);

Field

表单提交，如登录

 @FormUrlEncoded
 @POST("v1/login")
 Call userLogin(@Field("phone") String phone, @Field("password") String password);

传json格式

如果参数是json格式，如：

{       
    "apiInfo": {        
        "apiName": "WuXiaolong",        
        "apiKey": "666"     
    }       
}       

建立Bean

 public class ApiInfo {
        private ApiInfoBean apiInfo;

        public ApiInfoBean getApiInfo() {
            return apiInfo;
        }

        public void setApiInfo(ApiInfoBean apiInfo) {
            this.apiInfo = apiInfo;
        }

        public class ApiInfoBean {
            private String apiName;
            private String apiKey;
            //省略get和set方法
        }
    }

ApiStores

@POST("client/shipper/getCarType")
Call getData(@Body ApiInfo apiInfo);

代码调用

ApiInfo apiInfo = new ApiInfo();
ApiInfo.ApiInfoBean apiInfoBean = apiInfo.new ApiInfoBean();
apiInfoBean.setApiKey("666");
apiInfoBean.setApiName("WuXiaolong");
apiInfo.setApiInfo(apiInfoBean);
//调接口
getData(apiInfo);

传数组

@GET("v1/enterprise/find")
Call getData(@Query("id") String id, @Query("linked[]") String... linked);

代码调用

String id="WuXiaolong"；
String[] s = new String[]{"WuXiaolong"};
//调接口
getData(id, s);

传文件-单个

@Multipart
@POST("v1/create")
Call create(@Part("pictureName") RequestBody pictureName,  @Part MultipartBody.Part picture);

代码调用

RequestBody pictureNameBody = RequestBody.create(MediaType.parse(AppConstants.CONTENT_TYPE_FILE), "pictureName");
File picture= new File(path);
RequestBody requestFile = RequestBody.create(MediaType.parse(AppConstants.CONTENT_TYPE_FILE), picture);
// MultipartBody.Part is used to send also the actual file name
MultipartBody.Part picturePart = MultipartBody.Part.createFormData("picture", picture.getName(), requestFile);
//调接口
create(pictureNameBody, picturePart);

传文件-多个

@Multipart
@POST("v1/create")
Call create(@Part("pictureName") RequestBody pictureName,   @PartMap Map params);

代码调用

RequestBody pictureNameBody = RequestBody.create(MediaType.parse(AppConstants.CONTENT_TYPE_FILE), "pictureName");
File picture= new File(path);
RequestBody requestFile = RequestBody.create(MediaType.parse(AppConstants.CONTENT_TYPE_FILE), picture);
Map params = new HashMap<>();
params.put("picture\"; filename=\"" + picture.getName() + "", requestFile);
//调接口
create(pictureNameBody, params);

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