引入

compile 'com.squareup.okhttp3:okhttp:3.5.0'

新增網路訪問許可權

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

package com.zdsoft.okhttp0111;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import org.json.JSONObject;

import java.io.IOException;
import java.net.URLEncoder;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class MainActivity extends AppCompatActivity {
    private TextView tv_show;
    private EditText et_id;
    private Button bt_select;
    private String URL_BASE = "http://apis.baidu.com/apistore/mobilenumber/mobilenumber";
    private OkHttpClient client;

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

        initView();
        bt_select.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try {
                    String count = et_id.getText().toString();
                    if (count != null) {
                        Request request = new Request.Builder()
                                .url(URL_BASE + "?phone=" + URLEncoder.encode(count, "utf-8") + "")
                                //設定請求頭資訊
                                .addHeader("apikey", "你的ApiKey")
                                .build();
                        client.newCall(request).enqueue(new MyCallBack());
                    }

                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });


    }

    private void initView() {
        client = new OkHttpClient();
        tv_show = (TextView) findViewById(R.id.tv_show);
        et_id = (EditText) findViewById(R.id.et_id);
        bt_select = (Button) findViewById(R.id.bt_select);

    }

    private class MyCallBack implements Callback {

        @Override
        public void onFailure(Call call, IOException e) {
            Toast.makeText(MainActivity.this, "失敗", Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onResponse(Call call, Response response) throws IOException {
            final String result = response.body().string();
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    parseId(result);
                }
            });
        }
    }

    /**
     * 解析JSON檔案
     *
     * @param json
     */
    private void parseId(String json) {
        try {
            if (json != null) {
                JSONObject jsonObject = new JSONObject(json);
                JSONObject object = jsonObject.getJSONObject("retData");
                String province = object.getString("province");
                String city = object.getString("city");
                String supplier = object.getString("supplier");
                tv_show.setText(province + "\n" + city + "\n" + supplier);
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}