Android（五十三）：HttpURLConnection - GET、POST数据请求

展示

目录

布局​​PrimaryBlankApp/Resources/layout/activity_main.xml​​

<?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"
    android:padding="10dp">

    <Button
        android:id="@+id/btn01"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="请求" />

    <ImageView
        android:id="@+id/image_view"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:layout_marginBottom="5dp"
        android:padding="5dp"
        android:background="@color/colorPrimary" />

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:padding="5dp"
        android:background="@color/colorPrimary">

        <TextView
            android:id="@+id/text_view"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

    </ScrollView>

</LinearLayout>

配置允许Http

• 报错

​​Cleartext HTTP traffic to rap2api.taobao.org not permitted android:usesCleartextTraffic="true"​​

• 解决方法

• 可参考​​https://developer.android.google.cn/about/versions/pie/android-9.0-changes-28?hl=zh_cn#apache-p​​

<!-- PrimaryBlankApp/Properties/AndroidManifest.xml -->

脚本

​​PrimaryBlankApp/MainActivity.cs​​

using System;
using System.Collections.Generic;
using System.Text;
using Android.App;
using Android.Graphics;
using Android.OS;
using Android.Widget;
using Java.Lang;
using PrimaryBlankApp.Scripts;
using Thread = Java.Lang.Thread;

namespace PrimaryBlankApp
{
    [Activity(Label = "@string/app_name", Theme = "@style/AppTheme", MainLauncher = true)]
    public class MainActivity : Activity
    {
        // 请求参数
        private readonly List<Dictionary<string, string>> _urls = new List<Dictionary<string, string>>
        {
            // 图片
            new Dictionary<string, string>
            {
                { "method", "GET" },
                { "path", "https://img0.baidu.com/it/u=1108406315,1347537283&fm=26&fmt=auto" },
                { "data", "" },
                { "type", "1" }
            },
            // 图片
            new Dictionary<string, string>
            {
                { "method", "GET" },
                { "path", "https://img0.baidu.com/it/u=1623519966,546953385&fm=26&fmt=auto" },
                { "data", "" },
                { "type", "1" }
            },
            // 网站
            new Dictionary<string, string>
            {
                { "method", "GET" },
                { "path", /" },
                { "data", "" },
                { "type", "2" }
            },
            // GET 数据
            new Dictionary<string, string>
            {
                { "method", "GET" },
                { "path", "http://10.10.1.184:8888/getData" },
                { "data", "?name=Lee&sex=男" },
                { "type", "2" }
            },
            // POST 数据
            new Dictionary<string, string>
            {
                { "method", "POST" },
                { "path", "http://10.10.1.184:8888/postData" },
                { "data", "zh=中文&en=English" },
                { "type", "2" }
            }
        };

        // 详情数据
        private byte[] _bytes;

        private Handler _handler;

        private Button _btn01;

        private ImageView _imageView;

        private TextView _textView;

        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            SetContentView(Resource.Layout.activity_main);

            _imageView = FindViewById<ImageView>(Resource.Id.image_view);
            _textView = FindViewById<TextView>(Resource.Id.text_view);
            _btn01 = FindViewById<Button>(Resource.Id.btn01);
            if (_btn01 != null)
                _btn01.Click += delegate
                {
                    _btn01.Text = "请求(Loading ~~~)";
                    // 耗时操作必须要放在子线程
                    new Thread(new Runnable(delegate
                    {
                        var index = new Random().Next(0, _urls.Count);
                        var path = _urls[index]["path"];
                        var method = _urls[index]["method"];
                        var data = _urls[index]["data"];
                        var type = _urls[index]["type"];
                        _bytes = Request.CreateRequest(path, method, data);
                        var message = new Message();
                        message.What = Convert.ToInt32(type);
                        _handler.SendMessage(message);
                    })).Start();
                };
            
            _handler = new Handler(message =>
            {
                if (_bytes == null)
                {
                    _btn01.Text = "请求(Fail ~~~)";
                    return;
                }
                _btn01.Text = "请求(Success ~~~)";

                switch (message.What)
                {
                    case 1:
                        var bitmap = BitmapFactory.DecodeByteArray(_bytes, 0, _bytes.Length);
                        _imageView.SetImageBitmap(bitmap);
                        break;
                    case 2:
                        var text = Encoding.UTF8.GetString(_bytes);
                        _textView.Text = text;
                        break;
                }
            });
        }
    }
}

​​PrimaryBlankApp/Scripts/Request.cs​​

using System.Text;
using Android.Util;
using Java.IO;
using Java.Net;
using Exception = Java.Lang.Exception;

namespace PrimaryBlankApp.Scripts
{
    public static class Request
    {
        private static string TAG = "RequestMessage";

        private static HttpURLConnection _conn;

        public static byte[] CreateRequest(string path, string method, string data)
        {
            path += method == "GET" ? data : "";
            var url = new URL(path);
            _conn = (HttpURLConnection)url.OpenConnection();
            if (_conn == null) return null;
            _conn.RequestMethod = method;
            // 请求超时时间
            _conn.ConnectTimeout = 60000;
            // 读取超时时间
            _conn.ReadTimeout = 60000;

            if (method == "POST")
            {
                _conn.DoInput = true;
                _conn.DoOutput = true;
                _conn.UseCaches = false;
                _conn.OutputStream?.Write(Encoding.UTF8.GetBytes(data)); // 添加参数
            }

            try
            {
                if (_conn.ResponseCode == HttpStatus.Ok)
                {
                    Log.Info(TAG, $"{TAG} ---> Success ~~~");
                    return DataToBytes();
                }
            }
            catch (Exception e)
            {
                Log.Info(TAG, $"{TAG} ---> Fail ~~~");
                e.PrintStackTrace();
            }
            finally
            {
                _conn.Disconnect();
            }

            return null;
        }

        // 处理数据
        private static byte[] DataToBytes()
        {
            var byteArrayOutputStream = new ByteArrayOutputStream();
            var buffer = new byte[1024];
            var inputStream = _conn.InputStream;
            int len;
            while (inputStream != null && (len = inputStream.Read(buffer)) > 0)
            {
                byteArrayOutputStream.Write(buffer, 0, len);
            }

            return byteArrayOutputStream.ToByteArray();
        }
    }
}