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首先记得在build.gradle 和 配置文件分别加上依赖 和 网络权限

implementation'com.squareup.okhttp3:okhttp:3.9.1'

下面是具体代码

package com.example.okhttpdemo;import android.os.Bundle;import android.view.View;import android.widget.TextView;import androidx.appcompat.app.AppCompatActivity;import java.io.IOException;import okhttp3.Call;import okhttp3.Callback;import okhttp3.FormBody;import okhttp3.OkHttpClient;import okhttp3.Request;import okhttp3.Response;public class MainActivity extends AppCompatActivity {    private TextView tvResult;    //测试接口    private String strGet = "http://www.baidu.com/";    private String strPost = "http://api.apiopen.top/likePoetry";    //1.拿到okHttpClient对象    OkHttpClient okHttpClient = new OkHttpClient();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        tvResult = findViewById(R.id.tv_result);    }    public void doGet(View view) {        //1.拿到okHttpClient对象        //2.构造Request        Request.Builder builder = new Request.Builder();        Request request = builder.get().url(strGet).build();        //3.将Request封装位call        Call call = okHttpClient.newCall(request);        //4.执行call        //Response response = call.execute();//同步        call.enqueue(new Callback() {//异步            @Override            public void onFailure(Call call, IOException e) {                L.e("onFailure:" + e.getMessage());            }            @Override            public void onResponse(Call call, Response response) throws IOException {                final String res = response.body().string();                L.e("onResponse:" + res);                runOnUiThread(new Runnable() {//异步在子线程，不允许直接显示                    @Override                    public void run() {                        tvResult.setText(res);                    }                });            }        });    }    public void doPost(View view) {        FormBody formBody = new FormBody.Builder().add("name", "李白").build();        //1.拿到okHttpClient对象        //2.构造Request        Request.Builder builder = new Request.Builder();        Request request = builder.url(strPost).post(formBody).build();        //3.将Request封装位call        Call call = okHttpClient.newCall(request);        //4.执行call        call.enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {                L.e("onFailure:" + e.getMessage());            }            @Override            public void onResponse(Call call, Response response) throws IOException {                final String res = response.body().string();                L.e("onResponse:" + res);                runOnUiThread(new Runnable() {//异步在子线程，不允许直接显示                    @Override                    public void run() {                        tvResult.setText(res);                    }                });            }        });    }}

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