Android Retrofit2 网路编程

Android里面本身有OKHttp，不过不是很好用，这里就用Retrofit2，简单好用。

首先，需要加入网络权限：

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

在build.gradle文件里加入引用包： Gson不用的话，就不需要添加

    implementation 'com.squareup.okhttp3:okhttp:3.0.1'
    implementation 'com.squareup.retrofit2:retrofit:2.0.2'
    implementation 'com.squareup.retrofit2:converter-gson:2.0.2'

这时准备工作做完了。

先创建一个接口文件TestService

package controller.hzl.com.testclient;

import java.util.List;

import okhttp3.ResponseBody;
import retrofit2.Call;
import retrofit2.http.Field;
import retrofit2.http.FormUrlEncoded;
import retrofit2.http.GET;
import retrofit2.http.HTTP;
import retrofit2.http.POST;
import retrofit2.http.Path;

public interface TestService {

    @FormUrlEncoded
    @POST("getmacaddress")
    Call<ResponseBody> TestCall2(@Field("mobile") String mobile);

    @FormUrlEncoded
    @POST("getmacaddress")
    Call<MacAdress> TestCall3(@Field("mobile") String mobile);
}

这里的@POST("getmacaddress") 的getmacaddress 是URL除IP外的最后一个路径，可以理解为 IP+getmacaddress

这里用的是POST请求方式，@Field("mobile")为请求接口的参数。

写一个实体类模型，用来匹配接收的数据MacAdress

package controller.hzl.com.testclient;

public class MacAdress {
    private String resultMsg;

    public String getResultMsg() {
        return resultMsg;
    }

    public void setResultMsg(String resultMsg) {
        this.resultMsg = resultMsg;
    }

    public String getResultState() {
        return resultState;
    }

    public void setResultState(String resultState) {
        this.resultState = resultState;
    }

    public String getResultObj() {
        return resultObj;
    }

    public void setResultObj(String resultObj) {
        this.resultObj = resultObj;
    }

    public String getMessage() {
        return message;
    }

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

    public String getDelta() {
        return delta;
    }

    public void setDelta(String delta) {
        this.delta = delta;
    }

    private String resultState;

    private String resultObj;

    private String message;

    private String delta;

}

最后主MainActivity

package controller.hzl.com.testclient;

import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TextView;

import okhttp3.MediaType;
import okhttp3.RequestBody;
import okhttp3.ResponseBody;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;

public class MainActivity extends Activity {
    private Button button1;
    private Button button2;
    private Button button3;
    private Button button4;
    private Button button5;
    private Button button6;
    private Button button7;
    private Button button8;
    private ImageView image;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button1 = (Button) findViewById(R.id.button1);
        button2 = (Button) findViewById(R.id.button2);
        button3 = (Button) findViewById(R.id.button3);
        button4 = (Button) findViewById(R.id.button4);
        button5 = (Button) findViewById(R.id.button5);
        button6 = (Button) findViewById(R.id.button6);
        button7 = (Button) findViewById(R.id.button7);
        button8 = (Button) findViewById(R.id.button8);
        image = (ImageView) findViewById(R.id.image); 

        button1.setOnClickListener(new OnClickListener(){
            @Override
            public void onClick(View arg0) {
                GitHubServiceTest();
            }
        });

        button2.setOnClickListener(new OnClickListener(){
            @Override
            public void onClick(View arg0) {
                IWeatherGetTest();
            }
        });
    }

    private void GitHubServiceTest() {
        Retrofit retrofit = new Retrofit.Builder()
            .baseUrl("http://115.29.190.99/api/meta/")
            .addConverterFactory(GsonConverterFactory.create())
            .build();

        TestService service = retrofit.create(TestService.class);

        //https://api.github.com/users/octocat/repos
        Call<ResponseBody> call = service.TestCall2("13296540788");
        call.enqueue(new Callback<ResponseBody>() {
                @Override
                public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
                    // Get result bean from response.body()
                   // List<Repo> repos = response.body();
                    System.out.println(response.code());
                    try {
                        System.out.println(response.body().string());
                        String jsonstr = new String(response.body().bytes());
                        System.out.println("jsonstr="+jsonstr);
                    }catch (Exception e){

                    }

                    // Get header item from response
                    String links = response.headers().get("Link");
                    showlog("links="+links);
                    /**
                      * 不同于retrofit1 可以同时操作序列化数据javabean和header
                    */
                }

                @Override
                public void onFailure(Call<ResponseBody> call, Throwable throwable) {
                    throwable.printStackTrace();
                    //showlog(throwable.getCause().toString());
                }
            });
    }

    private void IWeatherGetTest() {
        {
            Retrofit retrofit = new Retrofit.Builder()
                    .baseUrl("http://115.29.190.99/api/meta/")
                    .addConverterFactory(GsonConverterFactory.create())
                    .build();

            TestService service = retrofit.create(TestService.class);

            //https://api.github.com/users/octocat/repos
            Call<MacAdress> call = service.TestCall3("13296540788");
            call.enqueue(new Callback<MacAdress>() {
                @Override
                public void onResponse(Call<MacAdress> call, Response<MacAdress> response) {
                    // Get result bean from response.body()
                    // List<Repo> repos = response.body();
                    System.out.println(response.code());
                    try {
                        System.out.println(response.body().getResultObj());
                        System.out.println(response.body().getResultState());
                    }catch (Exception e){

                    }

                    // Get header item from response
                    String links = response.headers().get("Link");
                    showlog("links="+links);
                    /**
                     * 不同于retrofit1 可以同时操作序列化数据javabean和header
                     */
                }

                @Override
                public void onFailure(Call<MacAdress> call, Throwable throwable) {
                    throwable.printStackTrace();
                    //showlog(throwable.getCause().toString());
                }
            });
        }
    }

   public static void showlog(String info) {
          System.out.print("Retrofit " + info + "\n");
   }

}

这里的baseUrl("http://115.29.190.99/api/meta/")  就是URL的前面路径，加上@POST("getmacaddress") 的getmacaddress 其实就是 ： http://115.29.190.99/api/meta/getmacaddress   请求的全路径。

两种方式:

TestCall2 是直接接收接收返回json的数据。

TestCall3 是用模型接收返回的json数据。

输出结构为：

代码：https://pan.baidu.com/s/1Fpp4AyzRapV9FLST5fbJKg