Android网络请求框架Retrofit使用札记

Retrofit是一个安卓端开源网络请求库，目前依赖于okhttp：

http://square.github.io/retrofit/

并提供了多种数据转换工厂和RxJava适配工厂接口。例如：

compile 'com.squareup.retrofit2:retrofit:2.0.1'compile 'com.squareup.retrofit2:converter-gson:2.0.1'

?使用retrofit访问接口：

void test0() {        //创建Retrofit对象        Retrofit retrofit = new Retrofit.Builder()                .baseUrl("https://api.github.com")                .addConverterFactory(GsonConverterFactory.create())                .build();        GithubService service = retrofit.create(GithubService.class);        service.getContributors("square", "retrofit").enqueue(                new Callback<List<ContributorBean>>() {                    @Override                    public void onResponse(Call<List<ContributorBean>> call                            , Response<List<ContributorBean>> response) {                        for (ContributorBean con : response.body()) {                            Log.e("TAG", con.login);                        }                    }                    @Override                    public void onFailure(Call<List<ContributorBean>> call                            , Throwable t) {                        t.printStackTrace();                    }                });    }    interface GithubService {        //https://api.github.com/repos/{owner}/{repo}/contributors        @GET("/repos/{owner}/{repo}/contributors")        Call<List<ContributorBean>> getContributors(                @Path("owner") String owner,                @Path("repo") String repo);    }    class ContributorBean {        String login;        String type;    }

?演示了一个带参Get请求，使用Gson做json数据转换。

若要加入RxJava来做事件处理：

void test0() {        //创建Retrofit对象        Retrofit retrofit = new Retrofit.Builder()                .baseUrl("https://api.github.com")                .addConverterFactory(GsonConverterFactory.create())                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())                .build();        GithubService service = retrofit.create(GithubService.class);        service.getContributors("square", "retrofit")                .subscribeOn(Schedulers.io())                .observeOn(AndroidSchedulers.mainThread())                .subscribe(new Action1<List<ContributorBean>>() {                    @Override                    public void call(List<ContributorBean> contributorBeans) {                        for (ContributorBean con : contributorBeans) {                            Log.e("TAG", con.login);                        }                    }                });    }    interface GithubService {        //https://api.github.com/repos/{owner}/{repo}/contributors        @GET("/repos/{owner}/{repo}/contributors")        Observable<List<ContributorBean>> getContributors(                @Path("owner") String owner,                @Path("repo") String repo);    }    class ContributorBean {        String login;        String type;    }

?产生了同样的效果。

?

使用flatMap实现链式调用：访问接口1->接口1返回后->访问接口2->接口2返回

void test0() {        //创建Retrofit对象        Retrofit retrofit = new Retrofit.Builder()                .baseUrl("https://api.github.com")                .addConverterFactory(GsonConverterFactory.create())                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())                .build();        final GithubService service = retrofit.create(GithubService.class);        service.getContributors("square", "retrofit")                .flatMap(new Func1<List<ContributorBean>, Observable<List<EventBean>>>() {                    @Override                    public Observable<List<EventBean>> call(List<ContributorBean> contributorBeans) {                        for (ContributorBean con : contributorBeans) {                            Log.e("TAG", con.login);                        }                        return service.getEvents();                    }                }).subscribeOn(Schedulers.io())                .observeOn(AndroidSchedulers.mainThread())                .subscribe(new Action1<List<EventBean>>() {                    @Override                    public void call(List<EventBean> eventBeans) {                        for (EventBean eve : eventBeans) {                            Log.e("TAG", eve.created_at);                        }                    }                });    }    interface GithubService {        //https://api.github.com/repos/{owner}/{repo}/contributors        @GET("/repos/{owner}/{repo}/contributors")        Observable<List<ContributorBean>> getContributors(                @Path("owner") String owner,                @Path("repo") String repo);        //https://api.github.com/events        @GET("events")        Observable<List<EventBean>> getEvents();    }    class EventBean {        String id;        String type;        String created_at;    }    class ContributorBean {        String login;        String type;    }

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