[移动开发]Android Retrofit基本使用案例GET、POST

1、创建功能实现接口：

package com.example.webpractice;

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

public interface ServiceForRetrofit {
    public static final String URL="";

    @POST("/videos.json")
    @FormUrlEncoded  //post时需要加上
    Call<ResponseBody> post(@Field("name") String name, @Field("password") String password);

    @GET("videos.json")
    Call<ResponseBody> get(@Query("name") String name,@Query("password") String password);
}

2、实现方法：

package com.example.webpractice;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;
import okhttp3.FormBody;
import okhttp3.ResponseBody;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;

public class MainActivity extends AppCompatActivity {
    private Retrofit retrofit;
    private ServiceForRetrofit serviceForRetrofit;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
    }

    private void initView(){
        retrofit=new Retrofit.Builder()
                .baseUrl(ServiceForRetrofit.URL) //这里写你的url
                .build();
        //将接口实现类创建
        serviceForRetrofit=retrofit.create(ServiceForRetrofit.class); 
    }

    public void postRetrofit(View v){
        //实现方法
        Call<ResponseBody> call=serviceForRetrofit.post("Jack","123");
        //调用enqueue方法异步返回结果
        call.enqueue(new Callback<ResponseBody>() {
            @Override
            public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
                try {
                    String result=response.body().string();
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            Toast.makeText(MainActivity.this,result , Toast.LENGTH_SHORT).show();
                        }
                    });
                }catch (Exception e){
                    e.printStackTrace();
                }

            }

            @Override
            public void onFailure(Call<ResponseBody> call, Throwable t) {

            }
        });
    }

    public void getRetrofit(View v){
        Call<ResponseBody> call=serviceForRetrofit.get("Jack","123");
        call.enqueue(new Callback<ResponseBody>() {
            @Override
            public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
                try {
                    String result=response.body().string();
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            Toast.makeText(MainActivity.this,result , Toast.LENGTH_SHORT).show();
                        }
                    });
                }catch (Exception e){
                    e.printStackTrace();
                }
            }

            @Override
            public void onFailure(Call<ResponseBody> call, Throwable t) {

            }
        });
    }
}