Can you guys tell me how it should be done? I have out of browser app with a button. The Button does this:
Application.Current.CheckAndDownloadUpdateCompleted
+= (object sender, CheckAndDownloadUpdateCompletedEventArgs e)
=> MessageBox.Show(e.UpdateAvailable.ToString());
Application.Current.CheckAndDownloadUpdateAsync();
I run the app, add something, rebuild the app, click on the button - it says false.
What could be wrong with that?
UPD: BTW... it's OOB App
UPD2: I tested with Fiddler. It get's the xap, but still doesn't update
There is an Error member on the EventArgs, maybe you should check it?
For instance:
if (e.Error != null)
{
if (e.Error is PlatformNotSupportedException)
{
// Require a Silverlight plugin update
}
else if (e.Error is SecurityException)
{
// Require an elevation
}
}
Related
I am working on a Xamarin Forms project for which one requirement is to recognize certain key presses to trigger hot key actions. The devices that we will be deploying the application to have physical keyboards attached. For now, Android is the only platform that is being targeted.
From some research that I did yesterday afternoon, it sounds as though a custom page renderer is what is required. As I played with this concept this morning, I stumbled upon the On* key methods of the Activity class.
I tried adding the following to the MainActivity class in the Android project:
public override bool OnKeyUp([GeneratedEnum] Keycode keyCode, KeyEvent e)
{
return base.OnKeyUp(keyCode, e);
}
Placing a breakpoint on this method seems to show that this code is what is needed (read, this method is fired whenever I press a key on the keyboard).
The issue is that this method is also fired when an Entry control on the page has focus. Shouldn't the key press be handled by the Entry control and not bubbled up to the page?
Generally speaking, is this the right approach for what I am trying to accomplish? Are there other approaches that someone can point me to that might work better?
When I was working with hardware devices, I had to do something similar. I created a custom renderer for an entry on the Xamarin.android side. This captures the Enter key press for both hard and soft key in different events. I think creating custom render for a page like you did could work too but this only captures key presses for elements that are in focus. This works for me as I have the entry in focus when user presses the hardware Enter key.
[assembly: ExportRenderer(typeof(CustomEntry), typeof(CustomEntryRenderer))]
namespace Project.Droid.Controls {
public class CustomEntryRenderer : EntryRenderer {
public CustomEntryRenderer(Context context) : base(context) {
}
protected override void OnElementChanged(ElementChangedEventArgs<Entry> e) {
base.OnElementChanged(e);
Control.EditorAction += Control_EditorAction;
Control.KeyPress += NativeEditText_KeyPress;
}
// Fires only for Soft Keyboard
private void Control_EditorAction(object sender, Android.Widget.TextView.EditorActionEventArgs e) {
if (e.ActionId == ImeAction.Done) {
// your code
e.Handled = true;
}
}
// Fires for Hard Keyboard
private void NativeEditText_KeyPress(object sender, KeyEventArgs e) {
if (e.KeyCode == Keycode.Enter && e.Event.Action == KeyEventActions.Up) {
// your code
e.Handled = true;
}
else
e.Handled = false;
}
}
}
FYI: I also tried the MainActivity event that you are using and it did not work for me. I cannot recall why.
I would like to show ActivityIndicator object after user tap the login button on page. Unfortunately there is small problem to do that because it seems like ActivityIndicator change state after entire method is completed. This is code I wrote so far:
private void Login(object sender, EventArgs ev)
{
BusyIndicator.IsVisible = true; //<- here I want to show indicator
try
{
//some input validation, connection opening etc
ConnectionHandler.OpenConnection(ServerIP, "dmg", false);
}
catch (Exception e)
{
Logging.Error(e.Message, "Connection", e);
}
}
When I set breakpoint after BusyIndicator.IsVisible = true; there is absolutely no change in app. However I noticed that when method is completed then indicator is shown. Is this a correct behavior of this control?
Why I need this? Because field validation and connecting with server takes some time and I need to show to user that something happens in background. Login function takes ~1 sec so indicator show and hide quickly I can't even see any change.
How can I show indicator immediately after user tap a button?
Your problem is that Login() method is being executed in the UI thread. So, despite setting BusyIndicator.IsVisible = true;, the thread continues tio execute the method to get data, so the UI does not respond.
Solution, run the OpenConnection in a different thread:
private async void Login(object sender, EventArgs ev)
{
BusyIndicator.IsVisible = true; //<- here I want to show indicator
try
{
//some input validation, connection opening etc
await Task.Run(() => { ConnectionHandler.OpenConnection(ServerIP, "dmg", false);});
}
catch (Exception e)
{
Logging.Error(e.Message, "Connection", e);
}
}
I have followed the instructions as found in the documentation; however, when I launch my app using the specified protocol my-protocol:// (typed into a web browser), the app will launch but then it just stays on the splash screen, as if the navigation fails to do anything:
Code Example:
// MyApp.UWP/App.xaml.cs
protected override void OnActivated(IActivatedEventArgs args)
{
if (args.Kind == ActivationKind.Protocol)
{
ProtocolActivatedEventArgs eventArgs =
args as ProtocolActivatedEventArgs;
// TODO: Decide where to navigate, but for now just go to main page
Frame rootFrame = Window.Current.Content as Frame;
rootFrame.Navigate(typeof(MainPage), args);
}
}
Is there something obvious that I am doing wrong? Perhaps there is a better way to handle navigation? Or perhaps there is something that I overlooked?
Edit
This is particularly hard to troubleshoot, since I can't just run with debug in visual studio. To test it out I actually have to launch it from the my-protocol://, which is not connected to the debugger.
Is there a way to debug this when launched from the url / protocol?
I could reproduce your issue. #kennyzx's suggestion was correct. You would first need to do judgement before navigating.
Please refer to the following code sample for reference.
protected override void OnActivated(IActivatedEventArgs args)
{
base.OnActivated(args);
if (args.Kind == ActivationKind.Protocol)
{
ProtocolActivatedEventArgs eventArgs =
args as ProtocolActivatedEventArgs;
// TODO: Decide where to navigate, but for now just go to main page
Frame rootFrame = Window.Current.Content as Frame;
if (rootFrame == null)
{
rootFrame = new Frame();
}
Window.Current.Content = rootFrame;
rootFrame.Navigate(typeof(MainPage), args);
Window.Current.Activate();
}
}
In my App i am Using Navigation Drawer and Persistent Search Library in Action
bar https://github.com/KieronQuinn/PersistentSearch
So when i am in my Home Activity and Search View is not Shown and i press back Button
App is Exit Normally (No Issue)
But when Search View is Open and i Press back button there is an Exception Occurs
So i want to know how to handle Back Button In Persistent Search Library
Here is the Exception Details
Exception image
I figure out the way of handling this as
public void onBackPressed() {
DrawerLayout drawer = findViewById(R.id.drawer_layout);
if (this.search.isActivated()) {
closeSearch();
}
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
But Same Exception Occures
Any help will be Appreciated
Put this code in your activity to handle backpress event for search view
public boolean dispatchKeyEvent(KeyEvent e) {
if (e.getKeyCode() == 4 && binding.appBrLt.searchbox.getVisibility() == View.VISIBLE) {
//here write the code
return true;
} else {
return super.dispatchKeyEvent(e);
}
}
How can I find out if the user pressed F5 to refresh my page (Something like how SO implemented. If you refresh your page, the question counter is not increased). I have tested many code snippets mentioned in a dozen of tutorials, but none worked correctly.
To be more clear, suppose that i have an empty web form and would like to detect whether the user has pressed F5 in client-side (causing a refresh not submit) or not.
I can use session variables, but if the user navigates to another page of my site, and then comes back , I'd like to consider it as a new visit, not a refresh. so this is not a session-scope variable.
Thanks.
Update: The only workaround I could find was to inherit my pages from a base page, override the load method like below:
public class PageBase : System.Web.UI.Page
{
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
this.Session["LastViewedPage"] = Request.RawUrl;
}
}
and in every page if I was interested to know if this is a refresh:
if (this.Session["LastViewedPage"].ToString() == Request.RawUrl)
{
// This is a refresh!
}
I run into this problem and use the following code. It works well for me.
bool isPageRefreshed = false;
protected void Page_Load(object sender, EventArgs args)
{
if (!IsPostBack)
{
ViewState["ViewStateId"] = System.Guid.NewGuid().ToString();
Session["SessionId"] = ViewState["ViewStateId"].ToString();
}
else
{
if (ViewState["ViewStateId"].ToString() != Session["SessionId"].ToString())
{
isPageRefreshed = true;
}
Session["SessionId"] = System.Guid.NewGuid().ToString();
ViewState["ViewStateId"] = Session["SessionId"].ToString();
}
}
The only sure solution is to make a redirect to the same page , and here is a similar question: Post-Redirect-Get with ASP.NET
But there are also some other tricks, by adding some ticket on the page and see if this is the same or have change, see the full example and code at:
http://www.codeproject.com/Articles/68371/Detecting-Refresh-or-Postback-in-ASP-NET
and one more:
http://dotnetslackers.com/community/blogs/simoneb/archive/2007/01/06/Using-an-HttpModule-to-detect-page-refresh.aspx