AsyncTask GET请求

布局：

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical"
     tools:context="net.bwie.network.MainActivity">

     <Button
         android:id="@+id/get_network_data_btn"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="下载网络数据"/>

     <Button
         android:id="@+id/get_pic_btn"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="获取网络图片"/>

     <ImageView
         android:id="@+id/image_view"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:src="@mipmap/ic_launcher"/>

 </LinearLayout>

Activity:

 /**
  * 使用异步任务下载网络数据
  * 使用gson解析
  * 注：有时间看看我讲的原生json解析
  */
 public class MainActivity extends AppCompatActivity implements View.OnClickListener {

     public static final String KAI_YAN_URL = "http://baobab.kaiyanapp.com/api/v4/tabs/selected?udid=11111&vc=168&vn=3.3.1&deviceModel=Huawei%36&first_channel=eyepetizer_baidu_market&last_channel=eyepetizer_baidu_market&system_version_code=20";

     protected Button mGetNetworkDataBtn;
     protected Button mGetPicBtn;
     protected ImageView mImageView;

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

     @Override
     public void onClick(View view) {
         if (view.getId() == R.id.get_network_data_btn) {
             getDatas();
         } else if (view.getId() == R.id.get_pic_btn) {
             getPicture();
         }
     }

     private void getDatas() {
         MyTask task = new MyTask();
         task.execute(KAI_YAN_URL);
     }

     private void getPicture() {
         String imgUrl = "http://img.kaiyanapp.com/1699f3946ccd281230a1d887d169439f.png?imageMogr2/quality/60/format/jpg";

         Picasso
                 .with(this)
                 .load(imgUrl)
                 .into(mImageView);
     }

     private void initView() {
         mGetNetworkDataBtn = (Button) findViewById(R.id.get_network_data_btn);
         mGetNetworkDataBtn.setOnClickListener(MainActivity.this);
         mGetPicBtn = (Button) findViewById(R.id.get_pic_btn);
         mGetPicBtn.setOnClickListener(MainActivity.this);
         mImageView = (ImageView) findViewById(R.id.image_view);
     }

     private class MyTask extends AsyncTask<String, Void, List<KaiYan.ItemBean>> {

         @Override
         protected List<KaiYan.ItemBean> doInBackground(String... params) {
             String requestUrl = params[0];
             // 使用HTTPUrlConnection
             try {
                 URL url = new URL(requestUrl);
                 HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                 // 配置connection
                 connection.setRequestMethod("GET");// GET或POST必须大写
                 // 连接网络
                 connection.connect();
                 // 判断是否连接成功
                 if (connection.getResponseCode() == 200) {
                     // 获取来自网络的输入流
                     // 使用缓冲字符输入流
                     // 字节流转字符流
                     BufferedReader br = null;
                     br = new BufferedReader(new InputStreamReader(connection.getInputStream()));

                     // 最终接收的json字符串
                     String json = "";
                     // 使用缓冲流读取到的每一行数据
                     String line = "";

                     while ((line = br.readLine()) != null) {
                         json += line.trim();
                     }
                     // json数据产生完毕，该解析了
                     Gson gson = new Gson();
                     KaiYan kaiYan = gson.fromJson(json, KaiYan.class);
                     List<KaiYan.ItemBean> itemList = kaiYan.getItemList();
                     return itemList;

                 }
             } catch (Exception e) {
                 e.printStackTrace();
                 Toast.makeText(MainActivity.this, "下载错误", Toast.LENGTH_SHORT).show();
             }

             return null;
         }

         @Override
         protected void onPostExecute(List<KaiYan.ItemBean> itemList) {
             super.onPostExecute(itemList);

             // 可以使用RecyclerView或ListView展示数据
             for (KaiYan.ItemBean itemBean : itemList) {
                 Log.d("1507", "type: " + itemBean.getType() +
                         ", title: " + itemBean.getData().getTitle() +
                         ", url" + itemBean.getData().getPlayUrl());
             }
         }
     }

 }

Bean:

 package net.bwie.network.bean;

 import java.util.List;

 public class KaiYan {

     private List<ItemBean> itemList;

     public List<ItemBean> getItemList() {
         return itemList;
     }

     public void setItemList(List<ItemBean> itemList) {
         this.itemList = itemList;
     }

     public static class ItemBean {

         private String type = "";
         private DataBean data;

         public String getType() {
             return type;
         }

         public void setType(String type) {
             this.type = type;
         }

         public DataBean getData() {
             return data;
         }

         public void setData(DataBean data) {
             this.data = data;
         }

         public static class DataBean {

             private String playUrl = "";
             private String title = "";

             public String getPlayUrl() {
                 return playUrl;
             }

             public void setPlayUrl(String playUrl) {
                 this.playUrl = playUrl;
             }

             public String getTitle() {
                 return title;
             }

             public void setTitle(String title) {
                 this.title = title;
             }
         }

     }

 }

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