一、在build.gradlet添加
compile ‘com.squareup.okhttp3:okhttp:3.8.1’
compile ‘com.squareup.okio:okio:1.13.0’
二、添加使用权限
<uses-permission android:name=”android.permission.ACCESS_WIFI_STATE” />
<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” />
三、建一个简单的请求工具类
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import java.io.IOException;
import java.util.Map;
import okhttp3.MediaType;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;
/**
* Created by admin on 2018/4/25.
*/
public class OkHttpUtils {
private static final String TAG = OkHttpUtils.class.getSimpleName();
public static final MediaType JSON
= MediaType.parse(“application/json; charset=utf-8”);
private static final int GET = 1;
private static final int POSTJSON = 2;
private OkHttpClient client = new OkHttpClient();
private static OkHttpUtils instance;
private OkHttpUtils(){
}
public static OkHttpUtils getInstance(){
if (instance == null){
instance = new OkHttpUtils();
}
return instance;
}
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case GET:
Log.i(TAG,”GET—->”+(String) msg.obj);
break;
case POSTJSON:
Log.i(TAG, “POSTJSON—->”+(String) msg.obj + msg.arg1);
break;
}
}
};
/**
*
* @param url 请求地址
* @return
* @throws IOException
*/
private String get(String url) throws IOException {
Request request = new Request.Builder().url(url).build();
Response response = client.newCall(request).execute();
return response.body().string();
}
/**
*
* @param url 请求地址
* @param json json字符串请求参数
* @return
* @throws IOException
*/
public String postJson(String url, String json) throws IOException {
RequestBody body = RequestBody.create(JSON, json);
Request request = new Request.Builder()
.url(url)
.post(body)
.build();
Response response = client.newCall(request).execute();
//response.body().string()这一句代码在方法体里面只能用一次(包括打印输出的使用)
return response.body().string();
}
/**
* @param url 请求地址
*/
public void requestDataFromeGet(final String url) {
new Thread() {
@Override
public void run() {
super.run();
try {
String result = get(url);
Message message = Message.obtain();
message.what = GET;
message.obj = result;
handler.sendMessage(message);
} catch (IOException e) {
e.printStackTrace();
}
}
}.start();
}
/**
*
* @param url 请求地址
* @param map 请求参数(把map转换成gson)
*/
public void rquestDataFromePostJson(final String url, final Map<String, Object> map) {
new Thread(){
@Override
public void run() {
super.run();
try {
//Map转JSON数据
Gson gson = new GsonBuilder().enableComplexMapKeySerialization().create();
String result = postJson(url, gson.toJson(map));
Log.i(TAG,gson.toJson(map));
Message message = Message.obtain();
message.what = POSTJSON;
message.obj = result;
handler.sendMessage(message);
} catch (IOException e) {
e.printStackTrace();
}
}
}.start();
}
}
四、简单的调用
import android.content.Context;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import com.example.admin.currentdatetime.utils.OkHttpUtils;
import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
public class OkHttpActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_ok_http);
OkHttpUtils okHttpUtils = OkHttpUtils.getInstance();
okHttpUtils.requestDataFromeGet(“http://www.baidu.com”);
final Map<String, Object> map = new HashMap<>();
map.put(“machine_mac”, getMacAddress(this));
map.put(“machine_ip”, getIPAddress());
map.put(“win_num”, “0033”);
okHttpUtils.rquestDataFromePostJson(“https://”, map);
}
//获取MAC地址
public String getMacAddress(Context context) {
WifiManager wifi = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
WifiInfo info = wifi.getConnectionInfo();
return info.getMacAddress();
}
//获取IP地址
public static String getIPAddress() {
try {
for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements(); ) {
NetworkInterface intf = en.nextElement();
for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements(); ) {
InetAddress inetAddress = enumIpAddr.nextElement();
if (!inetAddress.isLoopbackAddress() && (inetAddress instanceof Inet4Address)) {
return inetAddress.getHostAddress().toString();
}
}
}
} catch (SocketException ex) {
ex.printStackTrace();
}
return null;
}
}
五、OkHttp使用的一些小坑
1、如果把get方法或者postJson的方法里面的response.body().string();写成response.body().toString();
返回的不是数据而是实例化对象okhttp3.internal.http.RealResponseBody@419a38380
2、response.body().string();只能使用一次。不然会报一个错误如下
为了方便使用进行Okhttp的二次封装：
https://blog.csdn.net/u011905195/article/details/85333049