implementation 'com.squareup.retrofit2:retrofit:2.4.0'

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

package com.lxm.bfdl;

import retrofit2.Call;

import retrofit2.http.GET;

import retrofit2.http.Path;

import retrofit2.http.Query;

public interface JW {

    @GET("geocoding?a=蘇州市")

    Call<String> jwd();

}

JW

Mainpackage com.lxm.bfdl;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.text.method.ScrollingMovementMethod;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

import retrofit2.Call;

import retrofit2.Callback;

import retrofit2.Response;

import retrofit2.Retrofit;

import retrofit2.converter.gson.GsonConverterFactory;

public class Main extends AppCompatActivity {

    Button btn01;

    EditText et01;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        btn01 = findViewById(R.id.buttonA);

        et01 = findViewById(R.id.et);

        Retrofit retrofit = new Retrofit.Builder()

                .baseUrl("http://gc.ditu.aliyun.com/") // 設定 網路請求 Url

                .addConverterFactory(GsonConverterFactory.create()) //設定使用Gson解析(記得加入依賴)

                .build();

        JW jw01 = retrofit.create(JW.class);

        Call<String> call = jw01.jwd();

        call.enqueue(new Callback<String>() {

            @Override

            public void onResponse(Call<String> call, Response<String> response) {

                btn01.setText("shunli");

            }

            @Override

            public void onFailure(Call<String> call, Throwable throwable) {

                btn01.setText("chucuole!");

            }

        });

    }

}