misc (2)

  • In the development of the PCL Storage (1), I had a little trouble to show icon images on the tab of the tabbed pages. I copied some icon images to Resources folder (for iOS), but those were not displayed correctly. Yes, icon images should be registered in Visual Studio. Right-click Resources folder, and add icon image files to the folder, then well done.
  • I am currently fighting with programming on Windows 10 as well as Mac OS. On Win10, mysterious build errors "Files has invalid value" always occurred in every Apps development. Just after creating a new solution, no error. But after a while, the error occurred. A--n--d I found it. Encryption Software for preventing information leakage! The software seemed to collapse some files in the solution folder. So I create a new solution in the folder which the encryption software doesn't patrol, and no error after that.
  • Xamarin Official Site is quite useful for me. When I investigate or study something, I firstly visit this site. And also, I sometimes look through free e-books of Kindle and iBooks such as "Creating Mobile Apps with Xamarin.Forms" and "Top 10 Xamarin Tips and Traps." Although all are written in English, no problem because need not to read from the beginning to the end, but use them just like dictionary. I am studying mobile app development with no money so far.


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Command Prompt (1)

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I have been fighting with programming to develop an App I want to use, but this Command Prompt App will not be directory useful for the App. This is just a Xamarin.Forms programming training for me. I wanted to more learn ScrollView which behavior is a little bit confusing, and also to find a smart style to monitor some variables and App's behaviors while running App, so I came up with an idea to develop Command-Prompt-like-UI App looking like Unix or MS-DOS console. Including PCL Storage will make possible file and directory I/O, but it will be in other post. In this post, just a development of a Command-Prompt-Like-UI is explained. MainPage.xaml <? xml  version = " 1.0 "  encoding = " utf-8 "   ?> < ContentPage   xmlns = " http://xamarin.com/schemas/2014/forms "               xmlns : x = " http://schemas.microsoft.com/winfx/2009/xaml "         ...
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ListView (2)

Having studied the basic function of the ListView control in the previous post,  ListView (1) , a variable "books" was declared as a list of book titles. But book information includes some attributes, author, date of issue etc., as well as title. So it seems to be good that book information is declared as a Class as below. Book Class public class Book {      public string Title { get; set; }      public string Author { get; set; } } The following sample code displays the ListView of book information declared as class type above. MainPage.xaml <? xml  version = " 1.0 "  encoding = " utf-8 "   ?> < ContentPage   xmlns = " http://xamarin.com/schemas/2014/forms "               xmlns : x = " http://schemas.microsoft.com/winfx/2009/xaml "               xmlns : local =...
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PCL Storage (2)

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Keywords:   Xamarin.Forms, PCL Storage, ListView, Mac Finder, Windows Explorer, Popup Menu, TapGestureRecognizer, Double Click, ContextActions, CommandParameter, {Binding .}, ListView.Footer, RowHeight of Grid where Label is placed, Border Color of Entry, INotifyPropertyChanged, ObservableCollection, OnSizeAllocated, Recursively Sort Hierarchy Data, NewGuid In the post PCL Storage (1) , I studied Folder and File I/O in Local Storage, but the User Interface (UI) of the App was not absolutely interesting.  The App in the previous post, Command Prompt (1) , is the one that I tried to make its UI more interesting (PCL Storage function has not been built into the Command Prompt App yet. I will make its development and post it as Command Prompt(2). ).  But I had an idea that Mac-Finder-Like-Viewer (Windows-Explorer-Like-View in other words) is also useful UI for folder and file I/O, so I introduce the development. Before getting to the main subject, let me explain fu...
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