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How to improvement my existing App

Connecting a Xamarin App with Azure and on premise SQL Server

Bind ListView to multiple types and objects

I know how to read or show all data inserted in the database but I don't know how to query a specific data. In the my database is in Post.cs it will store date/time and get 2 datas from user.
so like this: enter image description here

Column1(ID), Column2(Date), (column3(rain1), column4(rain2).
1 12/13/2019 21 22
2 12/16/2019 21 22
3 12/16/2019 11 12
I want to do: if (rain1 && rain2) have the same date. I would like to add 2data from rain1 which is 21+11 and save the total to rain1total=32 then rain2total would be 34. I don't know where to start

here is Post.cs

namespace listtoPDF.Model
{
//Post table, user posting drainvolume
//this is the source of Binding
public class Post: INotifyPropertyChanged
{
private double? rain1Vol;
private double? rain2Vol;
//from settingspage to show up in history
string rain1lbl = Settings.Drain1LocationSettings;
string rain2lbl = Settings.Drain2LocationSettings;

//ID primary key that we will autoincrement
//These are columns ID, drain1 to 8 so 9 columns
//These are binding source for Historypage
[PrimaryKey, AutoIncrement]
public int ID { get; set; }

public static bool showLabel { get; set; }  //public class model

public string rain1Lbl
{
    get => rain1lbl;
    set => rain1lbl= Settings.Drain1LocationSettings;    
}

public string rain2Lbl
{
    get => rain2lbl;
    set => rain2lbl= Settings.Drain2LocationSettings;    
}

public string CDateTime { get; set; }

[MaxLength(3)]
public double? rain1vol
{
    get { return rain1Vol; }
    set
    {
        rain1Vol = value;
        RaisePropertyChanged("rain1vol");
    }
}
[MaxLength(3)]
public double? rain2vol
{
    get { return rain2Vol; }
    set
    {
        rain2Vol = value;
        RaisePropertyChanged("rain2vol");
    }
}
public event PropertyChangedEventHandler PropertyChanged;

void RaisePropertyChanged(string property)
{
    if (PropertyChanged != null)
    {
        PropertyChanged(this, new PropertyChangedEventArgs(property));
    }

}

}
}
here is the main that will list data entered with date

namespace listtoPDF
{
public partial class MainPage : ContentPage
{
List posts;

public MainPage()
{
    InitializeComponent();
}

protected override void OnAppearing()
{
    base.OnAppearing();
    SQLiteConnection conn = new SQLiteConnection(App.DatabaseLocation);
    conn.CreateTable<Post>();
    posts = conn.Table<Post>().ToList();
    postListView.ItemsSource = posts;     
    conn.Close();
        //right click quickwatch

}
void addbuttonHandle_Clicked(object sender, EventArgs args)
{
    Navigation.PushModalAsync(new AddRainsPage());

}

private void GetValues()
{
    //Initiate SQLite connection
    //Create table with class
    //Get the values in table
    //close the line
    SQLiteConnection conn = new SQLiteConnection(App.DatabaseLocation);
    conn.CreateTable<Post>();
    posts = conn.Table<Post>().ToList();
    conn.Close();
}

}
Here is the page where i need query the add a certain column so i can add the data associated to it. So far it's connecting to the sqlite.

namespace listtoPDF
{
public partial class selecteddataPage : ContentPage
{
List posts;

public selecteddataPage()
{
    InitializeComponent();
}

private void GetValues()
{
    //Initiate SQLite connection
    //Create table with class
    //Get the values in table
    //close the line
    SQLiteConnection conn = new SQLiteConnection(App.DatabaseLocation);
    conn.CreateTable<Post>();
    posts = conn.Table<Post>().ToList();

    **if (Post.rain1 values have the same date )
      {
         totalrain1= then add data that have same date         
      }
     if (Post.rain2 values have the same date )
      {
         totalrain1= then add data that have same date         
      }**

    conn.Close();

}

}
}

Xamerin support needed - NYC

User profile based authentication

Hello, I'm using Xamarin Forms WebView with a custom renderer for using iOS WKWebView to load a website in my app. I'd like to know if there is a way to add a custom context menu item to the UIMenuController popped up when holding a link in the webview. Thanks in advance.

Hello,

my goal is to achieve this :

Every orange square is a "card" that contain two images and one label. My actual code is pretty bad, every time I want to add an item I need to modify the xaml to add a new item in my Grid.

I'm looking for a better option, where I can just modify my data to add an item without touching the xaml.

Thanks.

Hi All,

Let's say we are developing an online exam kind of solution and we want to detect if user is leaving the app and goes to some other application(e.g. google in browser) to find the answers for exam questions. What will be the good approach to implement this? Our app is on Android as well as Windows.

Thanks & Regards.

Hey Everyone!

I am having trouble uploading a file from a android webview. I have followed all the examples on the web I could find and none of them seem to work properly inside of Xamarin. Natively they do seem to work.

The problem comes with a crash using the IValueCallback after selecting a file in the File Chooser Intent. No matter how I call the IValueCallback it will crash. The file choose does show up properly and pass back a valid path to the selected image for javascript to use.

I followed these tutorials before posting this question:
http://stackoverflow.com/questions/5907369/file-upload-in-webview
http://m0s-programming.blogspot.com/2011/02/file-upload-in-through-webview-on.html (simpler)
http://stackoverflow.com/questions/9376142/mono-for-android-webview-input-field-filechooser-doesnt-work (Mono, this one seemed outdated since there is now a override in webview for OnShowFileChooser and the file chooser is indeed showing)
and a few others.
https://github.com/GoogleChrome/chromium-webview-samples/blob/master/input-file-example/app/src/main/java/inputfilesample/android/chrome/google/com/inputfilesample/MainFragment.java

So here are the errors:
• When I call the callback with the activity result as the above examples show it always says "android.net.uri cannot be converted to android.net.uri[]".
• If I create a list out of the result it says it has already been completed and cannot be called again.
• If I convert it to a string which someone on stack overflow suggested it says it is expecting a android.net.uri.

Here is the code:

`public override bool OnShowFileChooser (WebView webView, IValueCallback filePathCallback, FileChooserParams fileChooserParams)
{
if (mActivity == null) { return true; }

        if (mActivity is BaseActivity)
        {
            ((BaseActivity)mActivity).FILECHOOSER_CALLBACK = filePathCallback;
            Intent i = new Intent (Intent.ActionGetContent);
            i.AddCategory (Intent.CategoryOpenable);
            i.SetType ("image/*");
            mActivity.StartActivityForResult ( Intent.CreateChooser (i, "File Chooser"), ((BaseActivity)mActivity).FILECHOOSER_RESULTCODE );
            return false;
        } else {
            return true;
        }
    }`

`protected override void OnActivityResult (int requestCode, Result resultCode, Intent data)
{
if(requestCode == FILECHOOSER_RESULTCODE)
{
if (FILECHOOSER_CALLBACK == null) { return; }
if (resultCode == Result.Ok) {
try{
Android.Net.Uri result = data == null || resultCode != Result.Ok ? null : data.Data;
// throws a "bogey"

                    var a = new Android.Net.Uri[]{ result } ;
                    FILECHOOSER_CALLBACK.OnReceiveValue ( null );

                    // thows a string cannot be converted to android.net.uri[]
                    //FILECHOOSER_CALLBACK.OnReceiveValue ( (string)result  );

                    // throws a android.net.uri cannot be converted to  android.net.uri[]
                    //FILECHOOSER_CALLBACK.OnReceiveValue ( result  );

                    FILECHOOSER_CALLBACK = null;
                }catch(Exception e) {
                    Console.WriteLine (e.Message);
                }
            }
        }
    }`

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买美国文凭学历认证Q/微29304199〈YU毕业证成绩单offer〉留信认证/叶史瓦大学文凭毕业证成绩单本科硕士学位证书修改GPA成绩offer，雅思成绩单,在读证明,使馆认证(回国人员证明)Yes

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买美国文凭学历认证Q/微29304199〈UGA毕业证成绩单offer〉留信认证/乔治亚大学文凭毕业证成绩单本科硕士学位证书修改GPA成绩offer，雅思成绩单,在读证明,使馆认证(回国人员证明)Th

买美国文凭学历认证Q/微29304199〈BU毕业证成绩单offer〉留信认证/贝勒大学文凭毕业证成绩单本科硕士学位证书修改GPA成绩offer，雅思成绩单,在读证明,使馆认证(回国人员证明)Bayl

How to improvement my existing App

Connecting a Xamarin App with Azure and on premise SQL Server

Bind ListView to multiple types and objects

Xamarin, how can i access a specific column property in sqlite so i can add the values?

Xamerin support needed - NYC

User profile based authentication

How to add a custom context menu item to UIMenuController from a link inside a webview?

Display data with using Grid

Detecting if user switched to another app

Uploading Via Webview

삼척출장안마 [카톡KOM20-삼척출장샵] (Boss 20,NET) 삼척모텔출장 ㎹ 삼척콜걸샵 ㎹ 삼척출장마사지 ㎹ 삼척퇴폐업소 ㎹ 삼척유흥업소

청주출장안마 [카톡KOM20-청주출장샵] (Boss 20,NET) 청주모텔출장 ㎩ 청주콜걸샵 ㎩ 청주출장마사지 ㎩ 청주퇴폐업소 ㎩ 청주유흥업소