了解Retrofit的使用

retrofit使用

1.添加依赖,因为Retrofit是基于okhttp的:

// Okhttp库
compile 'com.squareup.okhttp3:okhttp:3.1.2'
// Retrofit库
compile 'com.squareup.retrofit2:retrofit:2.0.2'
compile 'com.squareup.retrofit2:converter-gson:2.0.2'//解析使用的Gson

2.网络权限:

<uses-permission android:name="android.permission.INTERNET"/>

3.创建返回数据对象,如:

package ipos.crg.com.recycledemo;

/**
 * Description:
 * Date       : 2018/7/31 17:47
 */

public class ResponseInfo {
    private String error;
    private String result;
    private String msgToken;

    public ResponseInfo() {
    }

    public ResponseInfo(String error, String result, String msgToken) {
        this.error = error;
        this.result = result;
        this.msgToken = msgToken;
    }

    public String getError() {
        return error == null ? "" : error;
    }

    public void setError(String error) {
        this.error = error;
    }

    public String getMsgToken() {
        return msgToken == null ? "" : msgToken;
    }

    public void setMsgToken(String msgToken) {
        this.msgToken = msgToken;
    }

    public String getResult() {
        return result == null ? "" : result;
    }

    public void setResult(String result) {
        this.result = result;
    }

    @Override
    public String toString() {
        return "ResponseInfo{" +
                "error='" + error + '\'' +
                ", result='" + result + '\'' +
                ", msgToken='" + msgToken + '\'' +
                '}';
    }
}

4.创建接口类,如;

public interface ResponseApi {
    @GET("myday05/{method}")
    Call<ResponseInfo> getResponse(@Path("method") String method);
}

或者

public interface ResponseApi {
    @GET("myday05/a.json")
    Call<ResponseInfo> getResponse();
}

通过这俩个代码可以看出@path的用法,这个接口主要就是直接可以通过注释请求;

@Header
@Path(与get后面的{}里面的值对应)
@Body
@GET
@POST(get,post,值不能为空)
@Query("num") String num(请求接口时,传入的数据)

5.实现网络请求

        Retrofit retrofit =
                new Retrofit.Builder()
//                        .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
                        .addConverterFactory(GsonConverterFactory.create())//设置数据解析器
                               .baseUrl("http://192.168.0.190:8989/")//最好带/,网络请求地址
                .build();
        ResponseApi responseApi = retrofit.create(ResponseApi.class);
        response = responseApi.getResponse("a.json");
        response.enqueue(new Callback<ResponseInfo>() {
            @Override
            public void onResponse(Call<ResponseInfo> call, Response<ResponseInfo> response) {
                Log.e("www", "ResponseInfo = " + response.body().toString());
            }

            @Override
            public void onFailure(Call<ResponseInfo> call, Throwable t) {
                Log.e("www", "Throwable = " + t.getMessage());
            }
        });