Add a new async Sample AsyncDownloadImage

The sample uses the new async feature to download, save and display a large image.
mcowart123 · Jul 24, 2013 · dc502e8 · dc502e8
1 parent d04f21e
commit dc502e8
Show file tree

Hide file tree

Showing 19 changed files with 776 additions and 0 deletions.
diff --git a/AsyncDownloadImage/AsyncDownloadImage.sln b/AsyncDownloadImage/AsyncDownloadImage.sln
@@ -0,0 +1,32 @@
+
+Microsoft Visual Studio Solution File, Format Version 11.00
+# Visual Studio 2010
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AsyncDownloadImage", "AsyncDownloadImage\AsyncDownloadImage.csproj", "{2C14BB0C-822A-4E51-8B64-9AADBAB84812}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|iPhoneSimulator = Debug|iPhoneSimulator
+		Release|iPhoneSimulator = Release|iPhoneSimulator
+		Debug|iPhone = Debug|iPhone
+		Release|iPhone = Release|iPhone
+		Ad-Hoc|iPhone = Ad-Hoc|iPhone
+		AppStore|iPhone = AppStore|iPhone
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{2C14BB0C-822A-4E51-8B64-9AADBAB84812}.Ad-Hoc|iPhone.ActiveCfg = Ad-Hoc|iPhone
+		{2C14BB0C-822A-4E51-8B64-9AADBAB84812}.Ad-Hoc|iPhone.Build.0 = Ad-Hoc|iPhone
+		{2C14BB0C-822A-4E51-8B64-9AADBAB84812}.AppStore|iPhone.ActiveCfg = AppStore|iPhone
+		{2C14BB0C-822A-4E51-8B64-9AADBAB84812}.AppStore|iPhone.Build.0 = AppStore|iPhone
+		{2C14BB0C-822A-4E51-8B64-9AADBAB84812}.Debug|iPhone.ActiveCfg = Debug|iPhone
+		{2C14BB0C-822A-4E51-8B64-9AADBAB84812}.Debug|iPhone.Build.0 = Debug|iPhone
+		{2C14BB0C-822A-4E51-8B64-9AADBAB84812}.Debug|iPhoneSimulator.ActiveCfg = Debug|iPhoneSimulator
+		{2C14BB0C-822A-4E51-8B64-9AADBAB84812}.Debug|iPhoneSimulator.Build.0 = Debug|iPhoneSimulator
+		{2C14BB0C-822A-4E51-8B64-9AADBAB84812}.Release|iPhone.ActiveCfg = Release|iPhone
+		{2C14BB0C-822A-4E51-8B64-9AADBAB84812}.Release|iPhone.Build.0 = Release|iPhone
+		{2C14BB0C-822A-4E51-8B64-9AADBAB84812}.Release|iPhoneSimulator.ActiveCfg = Release|iPhoneSimulator
+		{2C14BB0C-822A-4E51-8B64-9AADBAB84812}.Release|iPhoneSimulator.Build.0 = Release|iPhoneSimulator
+	EndGlobalSection
+	GlobalSection(MonoDevelopProperties) = preSolution
+		StartupItem = AsyncDownloadImage\AsyncDownloadImage.csproj
+	EndGlobalSection
+EndGlobal
diff --git a/AsyncDownloadImage/AsyncDownloadImage/AppDelegate.cs b/AsyncDownloadImage/AsyncDownloadImage/AppDelegate.cs
@@ -0,0 +1,37 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using MonoTouch.Foundation;
+using MonoTouch.UIKit;
+
+namespace AsyncDownloadImage
+{
+	// The UIApplicationDelegate for the application. This class is responsible for launching the 
+	// User Interface of the application, as well as listening (and optionally responding) to 
+	// application events from iOS.
+	[Register ("AppDelegate")]
+	public partial class AppDelegate : UIApplicationDelegate
+	{
+		// class-level declarations
+		UIWindow window;
+		AsyncDownloadImageViewController viewController;
+		//
+		// This method is invoked when the application has loaded and is ready to run. In this 
+		// method you should instantiate the window, load the UI into it and then make the window
+		// visible.
+		//
+		// You have 17 seconds to return from this method, or iOS will terminate your application.
+		//
+		public override bool FinishedLaunching (UIApplication app, NSDictionary options)
+		{
+			window = new UIWindow (UIScreen.MainScreen.Bounds);
+
+			viewController = new AsyncDownloadImageViewController ();
+			window.RootViewController = viewController;
+			window.MakeKeyAndVisible ();
+
+			return true;
+		}
+	}
+}
+
diff --git a/AsyncDownloadImage/AsyncDownloadImage/AsyncDownloadImage.csproj b/AsyncDownloadImage/AsyncDownloadImage/AsyncDownloadImage.csproj
@@ -0,0 +1,114 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">iPhoneSimulator</Platform>
+    <ProductVersion>10.0.0</ProductVersion>
+    <SchemaVersion>2.0</SchemaVersion>
+    <ProjectGuid>{2C14BB0C-822A-4E51-8B64-9AADBAB84812}</ProjectGuid>
+    <ProjectTypeGuids>{6BC8ED88-2882-458C-8E55-DFD12B67127B};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <OutputType>Exe</OutputType>
+    <RootNamespace>AsyncDownloadImage</RootNamespace>
+    <IPhoneResourcePrefix>Resources</IPhoneResourcePrefix>
+    <AssemblyName>AsyncDownloadImage</AssemblyName>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|iPhoneSimulator' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\iPhoneSimulator\Debug</OutputPath>
+    <DefineConstants>DEBUG;</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <MtouchLink>None</MtouchLink>
+    <ConsolePause>false</ConsolePause>
+    <MtouchDebug>true</MtouchDebug>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|iPhoneSimulator' ">
+    <DebugType>full</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\iPhoneSimulator\Release</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <MtouchLink>None</MtouchLink>
+    <ConsolePause>false</ConsolePause>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|iPhone' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\iPhone\Debug</OutputPath>
+    <DefineConstants>DEBUG;</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <MtouchDebug>true</MtouchDebug>
+    <ConsolePause>false</ConsolePause>
+    <CodesignKey>iPhone Developer</CodesignKey>
+    <MtouchI18n />
+    <MtouchArch>ARMv7</MtouchArch>
+    <IpaPackageName />
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|iPhone' ">
+    <DebugType>full</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\iPhone\Release</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <CodesignKey>iPhone Developer</CodesignKey>
+    <ConsolePause>false</ConsolePause>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Ad-Hoc|iPhone' ">
+    <DebugType>full</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\iPhone\Ad-Hoc</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <CodesignKey>iPhone Distribution</CodesignKey>
+    <BuildIpa>true</BuildIpa>
+    <ConsolePause>false</ConsolePause>
+    <CodesignProvision>Automatic:AdHoc</CodesignProvision>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'AppStore|iPhone' ">
+    <DebugType>full</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\iPhone\AppStore</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <CodesignKey>iPhone Distribution</CodesignKey>
+    <ConsolePause>false</ConsolePause>
+    <CodesignProvision>Automatic:AppStore</CodesignProvision>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Xml" />
+    <Reference Include="System.Core" />
+    <Reference Include="monotouch" />
+    <Reference Include="System.Net.Http" />
+  </ItemGroup>
+  <ItemGroup>
+    <Folder Include="Resources\" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="Info.plist" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Main.cs" />
+    <Compile Include="AppDelegate.cs" />
+    <Compile Include="AsyncDownloadImageViewController.cs" />
+    <Compile Include="AsyncDownloadImageViewController.designer.cs">
+      <DependentUpon>AsyncDownloadImageViewController.cs</DependentUpon>
+    </Compile>
+  </ItemGroup>
+  <ItemGroup>
+    <InterfaceDefinition Include="AsyncDownloadImageViewController.xib" />
+  </ItemGroup>
+  <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
+  <ItemGroup>
+    <BundleResource Include="Resources\Icon.png" />
+    <BundleResource Include="Resources\Icon%402x.png" />
+    <BundleResource Include="Resources\Icon-72.png" />
+    <BundleResource Include="Resources\Default.png" />
+    <BundleResource Include="Resources\Default%402x.png" />
+    <BundleResource Include="Resources\Default-568h%402x.png" />
+  </ItemGroup>
+</Project>
diff --git a/AsyncDownloadImage/AsyncDownloadImage/AsyncDownloadImageViewController.cs b/AsyncDownloadImage/AsyncDownloadImage/AsyncDownloadImageViewController.cs
@@ -0,0 +1,142 @@
+using System;
+using System.IO;
+using System.Drawing;
+using System.Net;
+using System.Net.Http;
+using System.Threading.Tasks;
+using System.Threading;
+
+using MonoTouch.CoreGraphics;
+using MonoTouch.CoreImage;
+
+using MonoTouch.Foundation;
+using MonoTouch.UIKit;
+
+namespace AsyncDownloadImage
+{
+	public partial class AsyncDownloadImageViewController : UIViewController
+	{
+		int clickNumber = 0;
+		WebClient webClient;
+		public AsyncDownloadImageViewController () : base ("AsyncDownloadImageViewController", null)
+		{
+		}
+
+		public override void DidReceiveMemoryWarning ()
+		{
+			// Releases the view if it doesn't have a superview.
+			base.DidReceiveMemoryWarning ();
+
+			// Release any cached data, images, etc that aren't in use.
+		}
+
+		public override void ViewDidLoad ()
+		{
+			base.ViewDidLoad ();
+
+			this.clickButton.TouchUpInside += (sender, e) => {
+				clickNumber++;
+				this.clickButton.SetTitle( "Click Me:" + clickNumber, UIControlState.Normal);
+			};
+
+			this.downloadButton.TouchUpInside += downloadAsync;
+
+			this.downloadProgress.Progress = 0.0f;
+
+		}
+
+		async void downloadAsync(object sender, System.EventArgs ea)
+		{
+			webClient = new WebClient ();
+			//An large image url
+			var url = new Uri ("http://photojournal.jpl.nasa.gov/jpeg/PIA15416.jpg");
+			byte[] bytes = null;
+
+
+			webClient.DownloadProgressChanged += HandleDownloadProgressChanged;
+
+			this.downloadButton.SetTitle ("Cancel",UIControlState.Normal);
+			this.downloadButton.TouchUpInside -= downloadAsync;
+			this.downloadButton.TouchUpInside += cancelDownload;
+			infoLabel.Text = "Downloading...";
+
+			//Start download data using DownloadDataTaskAsync
+			try{
+				bytes = await webClient.DownloadDataTaskAsync(url);
+			}
+			catch(TaskCanceledException){
+				Console.WriteLine ("Task Canceled!");
+				return;
+			}
+			catch(Exception e) {
+				Console.WriteLine (e.ToString());
+				return;
+			}
+			string documentsPath = Environment.GetFolderPath (Environment.SpecialFolder.Personal);	
+			string localFilename = "downloaded.png";
+ 			string localPath = Path.Combine (documentsPath, localFilename);
+			infoLabel.Text = "Download Complete";
+
+			//Save the image using writeAsync
+			FileStream fs = new FileStream (localPath, FileMode.OpenOrCreate);
+			await fs.WriteAsync (bytes, 0, bytes.Length);
+
+			Console.WriteLine("localPath:"+localPath);
+
+
+			//Resizing image is time costing, using async to avoid blocking the UI thread
+			UIImage image = null;
+			SizeF imageViewSize = imageView.Frame.Size;
+
+			infoLabel.Text = "Resizing Image...";
+			await Task.Run( () => { image = UIImage.FromFile(localPath).Scale(imageViewSize); } );
+			Console.WriteLine ("Loaded!");
+
+			imageView.Image = image;
+
+			infoLabel.Text = "Click Dowload button to download the image";
+
+
+			this.downloadButton.TouchUpInside -= cancelDownload;
+			this.downloadButton.TouchUpInside += downloadAsync;
+			this.downloadButton.SetTitle ("Download", UIControlState.Normal);
+			this.downloadProgress.Progress = 0.0f;
+		}
+
+
+
+		void HandleDownloadProgressChanged (object sender, DownloadProgressChangedEventArgs e)
+		{
+			this.downloadProgress.Progress = e.ProgressPercentage / 100.0f;
+		}
+
+		void cancelDownload(object sender, System.EventArgs ea)
+		{
+			Console.WriteLine ("Cancel clicked!");
+			if(webClient!=null)
+				webClient.CancelAsync ();
+
+			webClient.DownloadProgressChanged -= HandleDownloadProgressChanged;
+
+			this.downloadButton.TouchUpInside -= cancelDownload;
+			this.downloadButton.TouchUpInside += downloadAsync;
+			this.downloadButton.SetTitle ("Download", UIControlState.Normal);
+			this.downloadProgress.Progress = 0.0f;
+
+			new UIAlertView ("Canceled"
+			                 , "Download has been canceled."
+			                 , null
+			                 , "OK"
+			                 , null).Show();
+			infoLabel.Text = "Click Dowload button to download the image";
+		}
+
+
+		public override bool ShouldAutorotateToInterfaceOrientation (UIInterfaceOrientation toInterfaceOrientation)
+		{
+			// Return true for supported orientations
+			return (toInterfaceOrientation != UIInterfaceOrientation.PortraitUpsideDown);
+		}
+	}
+}
+
diff --git a/AsyncDownloadImage/AsyncDownloadImage/AsyncDownloadImageViewController.designer.cs b/AsyncDownloadImage/AsyncDownloadImage/AsyncDownloadImageViewController.designer.cs