Retrofit简单封装

参考博客
简单实用步骤
1 ApiService，所有需要的接口

public interface ApiService {    @GET("top250")    Call<MovieResponse> getMovices(@Query("start") int start, @Query("count") int count);}

2 ApiManager，用来简单的封装Retrofit

public class ApiManager {    /**     * 基础地址     */    private static final String Base_Url = "https://api.douban.com/v2/movie/";    private static final Retrofit sRetrofit = new Retrofit.Builder()            .baseUrl(Base_Url)            .addConverterFactory(GsonConverterFactory.create())            .addCallAdapterFactory(RxJavaCallAdapterFactory.create()) // 使用RxJava作为回调适配器            .build();    private static final ApiService apiManager = sRetrofit.create(ApiService.class);    public static Call<MovieResponse> getMovies(int start, int end){        return apiManager.getMovices(start,end);    }}

3 在activity中调用接口

public class MainActivity extends ListActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        getMovies();    }    private void getMovies() {        //参数的传递直接赋值？能不能用一个类进行封装？        ApiManager.getMovies(0,10)                .enqueue(new Callback<MovieResponse<List<Movie>>>() {            @Override            public void onResponse(Call<MovieResponse<List<Movie>>> call, Response<MovieResponse<List<Movie>>> response) {                MovieResponse movieResponse = response.body();                List<Movie> list = (List<Movie>) movieResponse.getSubjects();                Log.d("shj--",list.toString());                setData(list);            }            @Override            public void onFailure(Call<MovieResponse<List<Movie>>> call, Throwable t) {                Log.d("shj--","error"+t.getMessage());            }        });    }    private void setData(List<Movie> list) {        List<String> titles = new ArrayList<>();        for (int i=0;i<list.size();i++){            Movie m = list.get(i);            titles.add(m.getTitle());        }        BaseAdapter aa = new ArrayAdapter<String>(MainActivity.this, R.layout.main, titles);        setListAdapter(aa);    }}

思考：这里传递参数是直接赋值的，有没有统一的传参方式？
以上算是一个简单的网络请求了，但是考虑到有很多返回值，所以把返回值做一个统一的处理会好一点

/** * Created by apple on 17/7/6. * 0-请求成功   1-请求失败，登录过期   2-请求失败，无权限   3-请求失败-余额不足 */public abstract class HttpCallBack<T extends BaseCallModel> implements Callback<T> {    @Override    public void onFailure(Call<T> call, Throwable t) {    }    @Override    public void onResponse(Call<T> call, Response<T> response) {        if (response.raw().code() == 200) {//200是服务器有合理响应            if(response.body().errno == 0){                onSuc(response);            }            else if (response.body().errno == 1){            }            else if (response.body().errno == 2){                onAutoLogin();            }            else {                onFail(response.body().msg);            }        } else {//失败响应            onFailure(call, new RuntimeException("response error,detail = " + response.raw().toString()));        }    }    public abstract void onSuc(Response<T> response);    public abstract void onFail(String message);    public abstract void onAutoLogin();}

自定义Callback改成以上之后，网络请求变成

public class MainActivity2 extends ListActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        getMovies();    }    private void getMovies() {        //不能进行测试，这个json没有错误码，但是思路是这样的，封装起来统一去处理        ApiManager.getMovies(0,10)                .enqueue(new HttpCallBack<MovieResponse<List<Movie>>>() {                    @Override                    public void onSuc(Response<MovieResponse<List<Movie>>> response) {                        setData(response.body().getSubjects());                    }                    @Override                    public void onFail(String message) {                    }                    @Override                    public void onAutoLogin() {                    }                });    }    private void setData(List<Movie> list) {        List<String> titles = new ArrayList<>();        for (int i=0;i<list.size();i++){            Movie m = list.get(i);            titles.add(m.getTitle());        }        BaseAdapter aa = new ArrayAdapter<String>(MainActivity2.this, R.layout.main, titles);        setListAdapter(aa);    }}

下载链接，retrofit包下是该文章代码