The Top Tips You need to Learn about Data in your Mobile App
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The document outlines essential knowledge for developing mobile apps, specifically focusing on understanding data, HTTP protocols, web services, REST, data caching, and using MVVM frameworks. Key topics include request headers, verbs, response codes, and data types for caching, as well as practical examples of handling data in applications. The author emphasizes the importance of learning these concepts to enhance mobile application development effectively.
![HOW DOES HTTP WORK?
GET CODEMASH.COM
http://www.codemash.com/index.html
WHAT DOES THE BROWSER DO?
GET /index.html HTTP/1.0
From: cwoodruff@live.com
User-Agent: HTTPTool/1.0
[blank line here]
WHAT IS THE RESPONSE?
HTTP/1.0 200 OK
Date: Thu, 8 Jan 2015 3:30:00 GMT
Content-Type: text/html
Content-Length: 1354
<html>
<body>
</body>
</html>
The Top Reasons You Need to Learn about Data in Your Windows Phone App](https://image.slidesharecdn.com/thetoptipsyouneedtolearnaboutdatainyourwindowsphoneapp-sprout-151120161704-lva1-app6891/85/The-Top-Tips-You-need-to-Learn-about-Data-in-your-Mobile-App-8-320.jpg)
![EXAMPLES OF DATA CACHING
LOCALSETTINGS
The Top Reasons You Need to Learn about Data in Your Windows Phone App
Windows.Storage.ApplicationDataContainer localSettings = Windows.Storage.ApplicationData.Current.LocalSettings;
localSettings.Values["exampleSetting"] = "Hello Windows";
Windows.Storage.ApplicationDataCompositeValue composite = new Windows.Storage.ApplicationDataCompositeValue();
composite["intVal"] = 1;
composite["strVal"] = "string";
localSettings.Values["exampleCompositeSetting"] = composite;
Object value = localSettings.Values["exampleSetting"];
Windows.Storage.ApplicationDataCompositeValue composite =
(Windows.Storage.ApplicationDataCompositeValue)localSettings.Values["exampleCompositeSetting"];
localSettings.Values.Remove("exampleSetting");](https://image.slidesharecdn.com/thetoptipsyouneedtolearnaboutdatainyourwindowsphoneapp-sprout-151120161704-lva1-app6891/85/The-Top-Tips-You-need-to-Learn-about-Data-in-your-Mobile-App-30-320.jpg)
The Top Tips You need to Learn about Data in your Mobile App
- 1. The Top Reasons You Need to Learn about Data Before you Develop Your Mobile App CHRIS WOODRUFF
- 4. Agenda The Top Reasons You Need to Learn about Data in Your Windows Phone App :// HTTP 1 UNDERSTAND HTTP PROTOCOL WEB SERVICES 2 UNDERSTAND WEB SERVICES REST 3 UNDERSTAND REST DATA CACHING 4 KNOW HOW TO CACHE DATA IN THE APP MVVM 5 PICK AND USE A GOOD MVVM FRAMEWORK DATA VIZ 6 LEARN HOW TO SHOW DATA IN YOUR APP
- 5. UNDERSTAND HTTP PROTOCOL The Top Reasons You Need to Learn about Data in Your Windows Phone App
- 7. WHAT SHOULD YOU KNOW ABOUT HTTP? Resources These are the URLs you use to get to pages on the web Request Headers These are additional instructions that are sent with the request. These might define what type of response is required or authorization details. Request Verbs These describe what you want to do with the resource. A browser typically issues a GET verb to instruct the endpoint it wants to get data, however there are many other verbs available including things like POST, PUT and DELETE. Request Body Data that is sent with the request. For example a POST (creation of a new item) will required some data which is typically sent as the request body in the format of JSON or XML. Response Body This is the main body of the response. If the request was to a web server, this might be a full HTML page. Response Status codes These codes are issues with the response and give the client details on the status of the request. The Top Reasons You Need to Learn about Data in Your Windows Phone App
- 8. HOW DOES HTTP WORK? GET CODEMASH.COM http://www.codemash.com/index.html WHAT DOES THE BROWSER DO? GET /index.html HTTP/1.0 From: cwoodruff@live.com User-Agent: HTTPTool/1.0 [blank line here] WHAT IS THE RESPONSE? HTTP/1.0 200 OK Date: Thu, 8 Jan 2015 3:30:00 GMT Content-Type: text/html Content-Length: 1354 <html> <body> </body> </html> The Top Reasons You Need to Learn about Data in Your Windows Phone App
- 9. HTTP VERBS GET Requests a representation of the specified Requests using GET should only retrieve have no other effect. HEAD Asks for the response identical to the one that would correspond to a GET request, but without the response body. POST Requests that the server accept the entity enclosed in the request as a new subordinate of the web resource identified by the URI. PUT Requests that the enclosed entity be stored under the supplied URI. DELETE Deletes the specified resource. PATCH Applies partial modifications to a resource The Top Reasons You Need to Learn about Data in Your Windows Phone App TRACE Echoes back the received request so that a client can see what (if any) changes or additions have been made by intermediate servers. OPTIONS Returns the HTTP methods that the server supports for the specified URL.
- 10. HTTP RESONSE CODES 1XX Request received, continuing process. This class of status code indicates a consisting only of the Status-Line and and is terminated by an empty line. 2XX This class of status codes indicates the action requested by the client was received, understood, accepted and processed successfully. 3XX This class of status code indicates the client must take additional action to complete the request. 4XX The 4xx class of status code is intended for cases in which the client seems to have errored. 5XX The server failed to fulfill an apparently valid request. Response status codes beginning with the digit "5" indicate cases in which the server is aware that it has encountered an error or is otherwise incapable of performing the request. The Top Reasons You Need to Learn about Data in Your Windows Phone App
- 11. COMMON HTTP RESONSE CODES The Top Reasons You Need to Learn about Data in Your Windows Phone App 101 Switching Protocols - Tells the client that the server will switch protocols to that specified in the Upgrade message header field during the current connection. For example, when requesting a page, a browser might receive a status code of 101, followed by an "Upgrade" header showing that the server is changing to a different version of HTTP. 200 OK - The request sent by the client was successful. 202 Accepted - The request has been accepted for processing, but has not yet been processed. 204 No Content - The request was successful but does not require the return of an entity-body. 301 Moved Permanently - The resource has permanently moved to a different URI. 302 Found - The requested resource has been found under a different URI but the client should continue to use the original URI. 303 See Other - The requested response is at a different URI and should be accessed using a GET command at the given URI. 304 Not Modified - The resource has not been modified since the last request.
- 12. COMMON HTTP RESONSE CODES The Top Reasons You Need to Learn about Data in Your Windows Phone App 400 Bad Request - The syntax of the request was not understood by the server. 401 Not Authorized - The request needs user authentication. 403 Forbidden - The server has refused to fulfill the request. 404 Not Found - The document/file requested by the client was not found. 405 Method Not Allowed - The method specified in the Request-Line is not allowed for the specified resource. 407 Proxy Authentication Required - The request first requires authentication with the proxy. 500 Internal Server Error - The request was unsuccessful due to an unexpected condition encountered by the server. 502 Bad Gateway - The server received an invalid response from the upstream server while trying to fulfill the request. 503 Service Unavailable - The request was unsuccessful due to the server being down or overloaded. 504 Gateway Timeout - The upstream server failed to send a request in the time allowed by the server.
- 13. UNDERSTAND WEB SERVICES The Top Reasons You Need to Learn about Data in Your Windows Phone App
- 14. Types of Web Services 01 02 04 03 Simple Object Access protocol (SOAP) Representational State Transfer (REST) Remote Procedure Call (RPC) Calls over HTTP The Top Reasons You Need to Learn about Data in Your Windows Phone App
- 15. EVOLUTION OF WEB SERVICES? The Top Reasons You Need to Learn about Data in Your Windows Phone App
- 16. UNDERSTAND REST The Top Reasons You Need to Learn about Data in Your Windows Phone App
- 18. WHAT IS REST? RESOURCES VERBS URL The Top Reasons You Need to Learn about Data in Your Windows Phone App
- 19. WHAT SHOULD YOU KNOW ABOUT REST? Resources REST uses addressable resources to define the structure of the API. These are the URLs you use to get to pages on the web Request Headers These are additional instructions that are sent with the request. These might define what type of response is required or authorization details. Request Verbs These describe what you want to do with the resource. A browser typically issues a GET verb to instruct the endpoint it wants to get data, however there are many other verbs available including things like POST, PUT and DELETE. Request Body Data that is sent with the request. For example a POST (creation of a new item) will required some data which is typically sent as the request body in the format of JSON or XML. Response Body This is the main body of the response. If the request was to a web server, this might be a full HTML page, if it was to an API, this might be a JSON or XML document. Response Status codes These codes are issues with the response and give the client details on the status of the request. The Top Reasons You Need to Learn about Data in Your Windows Phone App
- 20. REST & HTTP VERBS GET Requests a representation of the specified Requests using GET should only retrieve have no other effect. POST Requests that the server accept the entity enclosed in the request as a new subordinate of the web resource identified by the URI. PUT Requests that the enclosed entity be stored under the supplied URI. DELETE Deletes the specified resource. The Top Reasons You Need to Learn about Data in Your Windows Phone App
- 21. EXAMPLES OF REST /Products RESOURCE EXPECTED OUTCOMEVERB RESPONSE CODE /Products?Color=green /Products /Products/81 /Products/881 /Products/81 /Products/81 GET GET POST GET GET PUT DELETE A list of all products in the system A list of all products in the system where the color is red Creation of a new product Product with an ID of 81 Some error message Update of the product with ID of 81 Deletion of the product with ID of 81 200/OK 200/OK 201/Created 200/OK 404/Not Found 204/No Content 204/No Content The Top Reasons You Need to Learn about Data in Your Windows Phone App
- 22. SWAGGER UI The Top Reasons You Need to Learn about Data in Your Windows Phone App BENEFITS GENERATE CLIENT CODE BASED ON YOUR SWAGGER KEEPS YOUR API FULLY DOCUMENTED UNDERSTAND REST API QUICKLY UPDATED WHEN YOU BUILD YOUR API
- 25. Testing REST Web Services The Top Reasons You Need to Learn about Data in Your Windows Phone App BROWSER DEVELOPER EXTENSIONS Web-based REST/Web Services Clients FIDDLER Free web debugging tool which logs all HTTP(S) traffic between your computer and the Internet. LINQPAD Interactively query SQL databases (among other data sources such as OData or WCF Data Services) using LINQ, as well as interactively writing C# code without the need for an IDE. SoapUI SoapUI is an open-source web service testing application for service-oriented architectures (SOA) and representational state transfers (REST). Its functionality covers web service inspection, invoking, development, simulation and mocking, functional testing, load and compliance testing.
- 26. DEMO The Top Reasons You Need to Learn about Data in Your Windows Phone App http://baseball-stats.info/api/Teams
- 27. KNOW HOW TO CACHE DATA IN THE APP The Top Reasons You Need to Learn about Data in Your Windows Phone App
- 28. 01 02 04 03 LOCAL Data that exists on the current device backed up in the cloud. APP DATA STORAGE The Top Reasons You Need to Learn about Data in Your Windows Phone App LOCALCACHE Persistent data that exists only on the current device. ROAMING Data that exists on all devices on which the user has installed the app. TEMPORARY Data that could be removed by the system at any time.
- 29. DATA TYPES FOR CACHING UInt8, Int16, UInt16, Int32, UInt32, Int64, UInt64, Single, Double Boolean Char16, String DateTime, TimeSpan GUID, Point, Size, Rect ApplicationDataCompositeValue The Top Reasons You Need to Learn about Data in Your Windows Phone App Note that there is no binary type. If you need to store binary data, use an app file
- 30. EXAMPLES OF DATA CACHING LOCALSETTINGS The Top Reasons You Need to Learn about Data in Your Windows Phone App Windows.Storage.ApplicationDataContainer localSettings = Windows.Storage.ApplicationData.Current.LocalSettings; localSettings.Values["exampleSetting"] = "Hello Windows"; Windows.Storage.ApplicationDataCompositeValue composite = new Windows.Storage.ApplicationDataCompositeValue(); composite["intVal"] = 1; composite["strVal"] = "string"; localSettings.Values["exampleCompositeSetting"] = composite; Object value = localSettings.Values["exampleSetting"]; Windows.Storage.ApplicationDataCompositeValue composite = (Windows.Storage.ApplicationDataCompositeValue)localSettings.Values["exampleCompositeSetting"]; localSettings.Values.Remove("exampleSetting");
- 31. EXAMPLES OF DATA CACHING LOCALFOLDER The Top Reasons You Need to Learn about Data in Your Windows Phone App Windows.Storage.StorageFolder localFolder = Windows.Storage.ApplicationData.Current.LocalFolder; Windows.Globalization.DateTimeFormatting.DateTimeFormatter formatter = new Windows.Globalization.DatetimeFormatting.DateTimeFormatter("longtime"); StorageFile sampleFile = await localFolder.CreateFileAsync("dataFile.txt", CreateCollisionOption.ReplaceExisting); await FileIO.WriteTextAsync(sampleFile, formatter.Format(DateTime.Now)); StorageFile sampleFile = await localFolder.GetFileAsync("dataFile.txt"); String timestamp = await FileIO.ReadTextAsync(sampleFile);
- 32. EXAMPLES OF DATA CACHING The Top Reasons You Need to Learn about Data in Your Windows Phone App TEMPORARYFOLDER Windows.Storage.StorageFolder temporaryFolder = Windows.Storage.ApplicationData.Current.TemporaryFolder; Windows.Globalization.DateTimeFormatting.DateTimeFormatter formatter = new Windows.Globalization.DatetimeFormatting.DateTimeFormatter("longtime"); StorageFile sampleFile = await temporaryFolder.CreateFileAsync("dataFile.txt", CreateCollisionOption.ReplaceExisting); await FileIO.WriteTextAsync(sampleFile, formatter.Format(DateTime.Now)); StorageFile sampleFile = await temporaryFolder.GetFileAsync("dataFile.txt"); String timestamp = await FileIO.ReadTextAsync(sampleFile);
- 33. EXAMPLES OF DATA CACHING The Top Reasons You Need to Learn about Data in Your Windows Phone App void InitHandlers() { Windows.Storage.ApplicationData.Current.DataChanged += new TypedEventHandler<ApplicationData, object>(DataChangeHandler); } void DataChangeHandler(Windows.Storage.ApplicationData appData, object o) { // Refresh your data } ROAMINGFOLDER
- 34. SQL AND NOSQL DATA SOLUTIONS SQLite A relational database management system contained in a C contrast to other database management systems, SQLite is not separate process that a client program running in another is part of the using program. The Top Reasons You Need to Learn about Data in Your Windows Phone App
- 35. PICK AND USE A GOOD MVVM FRAMEWORK The Top Reasons You Need to Learn about Data in Your Windows Phone App
- 36. BEAUTY OF MVVM The Top Reasons You Need to Learn about Data in Your Windows Phone App MODEL VIEWVIEW MODEL
- 37. DEMO The Top Reasons You Need to Learn about Data in Your Windows Phone App
- 38. LEARN GREAT UX AND HOW TO SHOW DATA IN YOUR APP The Top Reasons You Need to Learn about Data in Your Windows Phone App
- 39. EXAMPLES OF DATA VIZ The Top Reasons You Need to Learn about Data in Your Windows Phone App
- 40. BOOKS ABOUT DATA VIZ The Top Reasons You Need to Learn about Data in Your Windows Phone App
- 41. FINALLY!!
Editor's Notes
- #8: Hypertext Transfer Protocol
- #22: 200 OK -- Standard response for successful HTTP requests. The actual response will depend on the request method used. In a GET request, the response will contain an entity corresponding to the requested resource. In a POST request the response will contain an entity describing or containing the result of the action. 201 Created -- The request has been fulfilled and resulted in a new resource being created. 204 No Content -- The server successfully processed the request, but is not returning any content. Usually used as a response to a successful delete request. 404 Not Found -- The requested resource could not be found but may be available again in the future. Subsequent requests by the client are permissible.
- #24: http://petstore.swagger.io/#/
- #25: http://editor.swagger.io/#/
- #29: LocalFolder – a local folder, used for storing application data, it’s persistent across application updates and gets backed up to the cloud. This folder was already available in Windows Phone 8 and it’s the same folder as Isolated Storage known from Windows Phone 7. TemporaryFolder – also a local folder, but its space is managed by the OS. Whenever the system detects it’s running low on storage space, it will start deleting files in temporary so don’t ever strongly depend on files stored in this folder. It makes a perfect place for storing cached web responses or images that can be recreated any time. This folder does not participate in backups. RoamingFolder – files, stored in this folder, will roam across devices, meaning those files will be synchronized over the cloud whenever possible. Perfect for settings and/or small chunks of state (i.e. for continuous clients). When roaming is disabled on the device, those files (and settings) will get backed up as well. The storage space is limited to 100kB – if application goes over that quota, the synchronization stops (until the total usage falls back under roaming storage quota).
- #30: Windows.Storage.ApplicationDataCompositeValue -- Represents related app settings that must be serialized and deserialized atomically.
- #33: https://msdn.microsoft.com/en-us/library/windows/apps/br230562.aspx