Getting Started with Android Development Android development framework to explain the retrofit uses detailed series OkHttp

Foreword

　　retrofit package okhttp request based framework network, is OkHttp to complete work on the nature of network requests, and retrofit package interface is only responsible for network requests if you do not know OKhttp suggest that you first understand it is to learn to use retrofit, portal:. Android development framework uses detailed series OkHttp

　　Retrofit advantage is simple to use, decoupling, scalability, can be used with a variety of Json parsing framework (eg Gson), in addition to support RxJava. However, this does not explain the blog section with use of RxJava, and with the use of RxJava I will explain in another blog post.

　　In addition retrofit already packaged very well, matching a variety of usage on the maximum extent already, so I do not recommend unnecessary re- package retrofit (most packaged retrofit singleton) . Again package does not look handsome not let you are very Niubi. will only make you look stupid. the expansion has been very very decoupling achieve total destruction.

Github Address

　　https://github.com/square/retrofit

rely

　　If you do not use RxJava mode, then you only need to rely on the following two:

    implementation 'com.squareup.retrofit2:retrofit:2.6.2'
    implementation 'com.squareup.retrofit2:converter-gson:2.4.0'

　　gson is used to parse Json data used (personal preference Gson), Retrofit also supports other analytical tools such fastJson

 

Simple Demo

　　The old rules by thinking order to explain demo

1. Create a basic configuration request Retrofit

　　Retrofit Once configured, you can use a global Retrofit to request to the network (so you can achieve a single globally embodiments use), but of course, the following code demo:

　　Private Retrofit mRetrofit;
　　Private  void initHttpBase () { 
        mRetrofit = new new Retrofit.Builder () 
                .baseUrl ( "http://doclever.cn:8090/mock/5c3c6da33dce46264b24452b/") // Base network address 
                .addConverterFactory (GsonConverterFactory.create ()) // use Gson parsing 
                .build (); 
    }

2. Create Bean class after the data is returned

public class LoginBean {
    private int code;
    private String message;

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }
}

2. Create a network request interface

public  interface HttpList { 

    @FormUrlEncoded // annotation indicates there @Multipart form from a form available course you can not add 
    @POST ( "Test / login_test") // network request path 
    Call <LoginBean> login (@Field ( " Number ") Number String, @Field (" password " ) String password); 

}

Note that this is an interface class. LoginBean Bean class is returned after the data ( Retrofit automatically imported using analytical Gson)

3. Request Network

 

private void postHttp(){
        HttpList httpList = mRetrofit.create(HttpList.class);
        Call<LoginBean> call = httpList.login("181234123", "123456");
        call.enqueue(new Callback<LoginBean>() {
            @Override
            public void onResponse(Call<LoginBean> call, Response<LoginBean> response) {
                LoginBean bean = response.body();
                Log.e(TAG, "onResponse: code="+bean.getCode());
                Log.e(TAG, "onResponse: message="+bean.getMessage());
            }

            @Override 
            public  void the onFailure (Call <the LoginBean> Call, the Throwable T) { 
                Log.e (the TAG, "the onFailure: Network request failed =" + t.getMessage ()); 

            } 
        }); 
    }

 

In this way, we completed a network request is not particularly simple

 

How to Stop the network request

 

How to Add Header head

Header information is added in the form of fixed data

public interface HttpList {

    @Headers({"content1:one","content2:two"})
    @POST("test/logout_test")
    Call<LoginBean> logout1();

}

Header information is added in the form of non-fixed data

public interface HttpList {

    @POST("test/logout_test")
    Call<LoginBean> logout2(@Header("content") String content);

}