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"/>