[Xamarin] Android 透過 DownloadManager 下載檔案

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2015-11-30

透過系統內建的 DownloadManager 來下載檔案，這樣不但可以下載檔案，還可以透過系統內建就幫助做到續傳的效果，而寫APP 離開後系統依然會繼續下載，因為很方便，所以特地介紹一下

C# Code :

using System;

using Android.App;

using Android.OS;

using Android.Util;

using Android.Widget;

using Java.IO;

using Environment = Android.OS.Environment;

using Uri = Android.Net.Uri;

namespace SampleDownloadManager

    [Activity(Label = "SampleDownloadManager", MainLauncher = true, Icon = "@drawable/icon")]

    public class MainActivity : Activity

        private DownloadManager DownloadManager1;

        protected override void OnCreate(Bundle bundle)

            base.OnCreate(bundle);

            // Set our view from the "main" layout resource

            SetContentView(Resource.Layout.Main);

            // Get our button from the layout resource,

            // and attach an event to it

            Button btnDownload = FindViewById<Button>(Resource.Id.btnDownload);

            btnDownload.Click += delegate

try

                    //Init DownloadManager

                    DownloadManager1 = (DownloadManager)GetSystemService(DownloadService);

                    //製作下載請求

                    DownloadManager.Request request =

                        new DownloadManager.Request(

                            Uri.Parse("http://s.nownews.com/media_crop/91002/hash/dd/49/dd49f467ebd588a31c56c1dfa7d49d06.jpg"));

                    //可以透過wifi and mobile

                    request.SetAllowedNetworkTypes(DownloadNetwork.Mobile | DownloadNetwork.Wifi);

                    request.SetAllowedOverRoaming(false);

                    request.SetTitle("資料下載中");

                    request.SetDescription("請不要中斷，等候下載");

                    //存檔的目錄 預設我將放置到系統預設的下載

                    var dirPath =

                        new File(

                            Environment.GetExternalStoragePublicDirectory(

                                Environment.DirectoryDownloads) + "/SampleX/");

                    if (!dirPath.Exists())

                        dirPath.Mkdirs();

                    //存檔的實體路徑

                    var uriTarget = Uri.FromFile(new File(dirPath.AbsolutePath + "/hebe.jpg"));

                    request.SetDestinationUri(uriTarget);

                    DownloadManager1.Enqueue(request);

                catch (Exception ex)

                    //Log Error

                    Log.Error("SampleDownloadManager", ex.Message + "," + ex.StackTrace);

};

很簡單的Code 筆記一下.