请求步骤:
1,定义接口(封装URL地址和数据请求)
2,实例化Retrofit
3,通过Retrofit实例创建接口服务对象
4,接口服务对象调用接口中的方法,获取Call对象
5,Call对象执行请求(异步、同步请求)
目录
1. 定义接口
ApiServer.java
import okhttp3.RequestBody;
import okhttp3.ResponseBody;
import retrofit2.Call;
import retrofit2.http.Body;
import retrofit2.http.Field;
import retrofit2.http.FormUrlEncoded;
import retrofit2.http.Headers;
import retrofit2.http.POST;
/**
* Created on 2019/5/15 14:56
*
* @author Q.PeterGuo
* @version 1.0.0
* @Description
*/
public interface ApiServer {
/*
// 1.新闻类别
// 请求头:Content-Type:application/x-www-form-urlencoded
String newsCategories = "http://api.shujuzhihui.cn/api/news/categories?appKey=be3ac46843914f5cbe875defccd8f392";
-----------------------------------------------------------------------------------------------------------------
// 2.新闻列表
// 请求头:Content-Type:application/json
// 请求体:
{
"category": "要闻",
"page": "1"
}
String newsList = "http://api.shujuzhihui.cn/api/news/list?appKey=be3ac46843914f5cbe875defccd8f392";
-----------------------------------------------------------------------------------------------------------------
// 3.新闻详情
// 请求头(header):Content-Type:application/x-www-form-urlencoded
// 请求内容(body):newsId:82264991a5932770734bbd386aebedf6
{
"appKey": "be3ac46843914f5cbe875defccd8f392",
"newsId": "82264991a5932770734bbd386aebedf6"
}
String newsDetail = "http://api.shujuzhihui.cn/api/news/detail?appKey=be3ac46843914f5cbe875defccd8f392";
*/
String NEWS_URL = "http://api.shujuzhihui.cn/api/news/";
// 新闻类别列表
@POST("categories")
@FormUrlEncoded
@Headers("Content-Type:application/x-www-form-urlencoded")
Call getCategories(@Field("appKey") String appKey);
// 新闻列表
@POST("list?appKey=be3ac46843914f5cbe875defccd8f392")
@Headers("Content-Type:application/json")
Call getList(@Body RequestBody requestBody);
// 新闻详情
@POST("detail")
@FormUrlEncoded
@Headers("Content-Type:application/x-www-form-urlencoded")
Call getDetail(@Field("appKey") String appKey, @Field("newsId") String newsId);
}
2. 在主页面进行网络请求
DemoActivity.java
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.example.guolei.retrofit_demo.ok.ApiServer;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.IOException;
import okhttp3.MediaType;
import okhttp3.RequestBody;
import okhttp3.ResponseBody;
import retrofit2.Call;
import retrofit2.Response;
import retrofit2.Retrofit;
// post 同步请求
public class DemoActivity extends AppCompatActivity implements View.OnClickListener {
private Button bt_categories;
private Button bt_list;
private Button bt_detail;
private TextView tv;
private RecyclerView rlv;
private static final String TAG = "DemoActivity";
private Retrofit mRetrofit;
private ApiServer mApiServer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_demo);
initView();
// 如果出现Socket 超时,可以设置如下代码:增大客户端的超时时间
System.setProperty("sun.net.client.defaultConnectTimeout", String
.valueOf(10000));// (单位:毫秒)
System.setProperty("sun.net.client.defaultReadTimeout", String
.valueOf(10000)); // (单位:毫秒)
}
private void initView() {
bt_categories = (Button) findViewById(R.id.bt_categories);
bt_list = (Button) findViewById(R.id.bt_list);
bt_detail = (Button) findViewById(R.id.bt_detail);
tv = (TextView) findViewById(R.id.tv);
rlv = (RecyclerView) findViewById(R.id.rlv);
bt_categories.setOnClickListener(this);
bt_list.setOnClickListener(this);
bt_detail.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.bt_categories:
// 1.获取Retrofit 对象
mRetrofit = new Retrofit.Builder()
.baseUrl(ApiServer.NEWS_URL)
.build();
// 2.获取到ApiServer 接口服务对象
mApiServer = mRetrofit.create(ApiServer.class);
// 3.获取call对象
final Call categories = mApiServer.getCategories("be3ac46843914f5cbe875defccd8f392");
new Thread(new Runnable() { // 子线程执行
@Override
public void run() {
try {
// 4. call对象执行同步请求,请求数据在子线程中执行
Response execute = categories.execute();
final String result = execute.body().string();
runOnUiThread(new Runnable() { // 主线程执行
@Override
public void run() {
if (result != null){
tv.setText(result); // 设置数据时,要在主线程中运行
}
}
});
} catch (IOException e) {
e.printStackTrace();
}
}
}).start();
break;
case R.id.bt_list:
// 1.获取Retrofit 对象
mRetrofit = new Retrofit.Builder()
.baseUrl(ApiServer.NEWS_URL)
.build();
// 2.获取到ApiServer 接口服务对象
mApiServer = mRetrofit.create(ApiServer.class);
// 获取到请求类型(MediaType)
MediaType mediaType = MediaType.parse("application/json;charset=UTF-8");
// 获取到请求内容
JSONObject jsonObject = new JSONObject();
try {
jsonObject.put("category", "要闻");
jsonObject.put("page", "1");
} catch (JSONException e) {
e.printStackTrace();
}
String str = jsonObject.toString();
// 获取到请求体(RequestBody)
final RequestBody requestBody = RequestBody.create(mediaType, str);
// 3.获取call对象
final Call list = mApiServer.getList(requestBody);
// 4.call对象执行同步请求
new Thread(new Runnable() {
@Override
public void run() {
try {
Response execute = list.execute();
final String result = execute.body().string();
runOnUiThread(new Runnable() {
@Override
public void run() {
if (result != null){
tv.setText(result);
}
}
});
} catch (IOException e) {
e.printStackTrace();
}
}
}).start();
break;
case R.id.bt_detail:
// 1.获取Retrofit 对象
mRetrofit = new Retrofit.Builder()
.baseUrl(ApiServer.NEWS_URL)
.build();
// 2.获取到ApiServer 接口服务对象
mApiServer = mRetrofit.create(ApiServer.class);
// 3.获取到call对象
final Call detail = mApiServer.getDetail("be3ac46843914f5cbe875defccd8f392", "82264991a5932770734bbd386aebedf6");
new Thread(new Runnable() {
@Override
public void run() {
try {
Response execute = detail.execute();
final String result = execute.body().string();
runOnUiThread(new Runnable() {
@Override
public void run() {
if (result != null){
tv.setText(result);
}
}
});
} catch (IOException e) {
e.printStackTrace();
}
}
}).start();
break;
}
}
}
3. 布局文件
activity_demo.xml
运行结果如下: