I am using a Map control in my app, and i need to set the visible region in such a way that it should cover all the pins.
Irony is same code doesn't work on both the platform, iOS works awkwardly , below code yield almost the same visible region in both platform.
if(Device.OS == TargetPlatform.iOS)
customMap.MoveToRegion (MapSpan.FromCenterAndRadius (customMap.CustomPins [0].Pin.Position, Distance.FromMiles (0.20)));
if(Device.OS == TargetPlatform.Android)
customMap.MoveToRegion (MapSpan.FromCenterAndRadius (customMap.CustomPins [0].Pin.Position, Distance.FromMiles (55.0)));
Can anyone explains it? why I need to code like it?
i have found a workaround , i am waiting for some explanation before accepting my own answer for it
Device.StartTimer(TimeSpan.FromMilliseconds(500), () =>
{
customMap.MoveToRegion(MapSpan.FromCenterAndRadius(customMap.CustomPins [0].Pin.Position, Distance.FromMiles(55.0)));
return false;
});
I was running into a problem where the MovetoRegion was being delayed (15-30 seconds) when trying to center on the users current location using the Xamarin Geolocator Plugin, on both IOS and Android. Things work alot better with Saket Kumar's approach with the 500ms delay. Here is my code snippet, hope this helps someone.
private void CenterOnMe_Clicked(object sender, EventArgs e)
{
var locator = CrossGeolocator.Current;
var t = Task.Run(async () =>
{
var position = await locator.GetPositionAsync(TimeSpan.FromSeconds(10));
Device.StartTimer(TimeSpan.FromMilliseconds(500), () =>
{
AroundMeMap.MoveToRegion(
MapSpan.FromCenterAndRadius(
new Position(position.Latitude, position.Longitude), Distance.FromMiles(1)));
return false;
});
});
}
Related
have found that in my electron application the following code from the main.js only returns a device list of length 1 (filled with one device) even though there are many devices around.
mainWindow.webContents.on('select-bluetooth-device', (event, deviceList, callback) => {
event.preventDefault();
console.log(deviceList);
bluetoothSelection.selectBluetoothDevice(deviceList, mainWindow, (deviceId) => {
callback(deviceId);
});
If I call
navigator.bluetooth.requestDevice({
acceptAllDevices: true,
optionalServices: [serviceUuid]
})
multiple times, the device returned changes and if I cycle through it often enough, I get the device I want eventually.. But I built a device Picker window and all that stuff and now the window opens for only one device, which makes everything quite annoying:P
Any ideas on what could cause this or even how I could fix it?
If you have a look at https://www.electronjs.org/docs/latest/api/web-contents#event-select-bluetooth-device you will find the example code provided by electron you probably already know:
win.webContents.on('select-bluetooth-device', (event, deviceList, callback) => {
event.preventDefault()
const result = deviceList.find((device) => {
return device.deviceName === "test"
})
if (!result) {
callback('')
} else {
callback(result.deviceId)
}
})
You have to prevent the callback until you have found the device you are looking for. I suggest to open a second window and pass in the deviceList. Now you can display the devices and let the user choose one. If the user has chosen a device, you can close the second window and call the callback with this deviceId.
To communicate between the windows you can use the “contextBridge” with “ipcRenderer” and “ipcMain” and to call the callback you can make a global variable
var callbackForBluetoothEvent = null;
and fill it int the
mainWindow.webContents.on(
// stuff
callbackForBluetoothEvent = callback; //to make it accessible outside
// stuff
);
With a “ipcMain.on”
ipcMain.on("BLEScannFinished", (event, args) => {
console.log(args);
console.log(BLEDevicesList.find((item) => item.deviceId === args));
let BLEDevicesChoosen = BLEDevicesList.find((item) => item.deviceId === args);
callbackForBluetoothEvent(BLEDevicesChoosen.deviceId);
});
You can than call the callback
Unfortunately this is a bit to much code for a forum post but you can find a rudimentary solution of this suggestion at the link:
https://github.com/grosdode/Electron-multible-BLE-devices
The electron issues 11865 was also helpful and there is a page which shows alternative code for the suggested solution. Unfortunately also to much code to post it here.
https://technoteshelp.com/electron-web-bluetooth-api-requestdevice-error/
I'm just trying to make my first app with MvvmCross but I already encounter a problem for my app and can't find anything on the web for that. I want to open a specific page as a modal dialog on supported devices (eg. iPads). For my non MvvmCross applications I do this with Rg.Plugin.Popup but I do not want it this way this time. I found a few solutions on how it can be done with native and MvvmCross but nothing about how it is done with Xamarin.Forms in combination to MvvmCross. Did I need to implement a own presenter and filter on the type of my page (because this page should always be modal on supported devices)? And if I do so, is there any example for this?
Using MvvmCross 5.2.0, the following worked for me (on iOS at least; haven't tested on Android):
var bundle = new MvxBundle(new Dictionary<string, string>{ { MvxFormsPagePresenter.ModalPresentationParameter, "true" } });
await _navService.Navigate<MyViewModel>(bundle);
This uses the stock-standard MvxFormsPagePresenter, so you don't have to create your own presenter.
I'm using MVVMCross 7.1.2 here, this was tested on Android only.
In your Views code behind implement IMvxOverridePresentationAttribute with code similar to this.
public MvxBasePresentationAttribute PresentationAttribute(MvxViewModelRequest request)
{
if (request.PresentationValues == null) return null;
if (request.PresentationValues.ContainsKey("NavigationMode") &&
request.PresentationValues["NavigationMode"] == "Modal")
{
return new MvxModalPresentationAttribute
{
WrapInNavigationPage = true,
Animated = false,
NoHistory = true
};
}
return null;
}
All you need to do now, is when Navigating to the view model is just pass a key value pair as the parameter like this
await NavigationService.Navigate<MainViewModel>(new MvxBundle(new Dictionary<string, string> { { "NavigationMode", "Modal" } }));
That's it... easy as that !
I'm using Xamarin with MvvmCross to create an iPad application. In this application I use the PictureChooser plugin to take a picture with the camera. This all occurs in the way that can be seen in the related youtube video.
The code to accomplish this is fairly simple and can be found below. However when testing this on the actual device, the camera might be rotated.
private readonly IMvxPictureChooserTask _pictureChooserTask;
public CameraViewModel(IMvxPictureChooserTask pictureChooserTask)
{
_pictureChooserTask = pictureChooserTask;
}
private IMvxPictureChooserTask PictureChooserTask { get { return _pictureChooserTask; } }
private void TakePicture()
{
PictureChooserTask.TakePicture(400, 95,
async (stream) =>
{
using (var memoryStream = new MemoryStream())
{
stream.CopyTo(memoryStream);
var imageBytes = memoryStream.ToArray();
if (imageBytes == null)
return;
filePath = ProcessImage(imageBytes, FileName);
}
},
() =>
{
/* no action - we don't do cancellation */
}
);
}
This will lead to unwanted behavior. The camera should remain steady and be prevented in rotating within the App. I have been trying some stuff out, like preventing the app from rotating in the override bool ShouldAutorotate method while in camera mode, but unfortunately without any results.
Is there any setting that I forgot to set on the PictureChooser, or is the override method the item where I should perform some magic?
Thanks in advance.
Answer to this question has been raised in the comments of the question by user3455363, many thanks for this! Eventually it seemed to be a bug in iOS 8. The iOS 8.1 upgrade fixed this issue in my App!
I recently received a support ticket that some of our web app's functionality is crashing safari on the iPad. This functionality had no problems prior to the latest iOS 7.0.6 update. We have a few GWT ValueListBoxes that change the DOM when their values are changed. Prior to making the changes, we present the user with a Window.confirm() message to inform them of the effects the changes will have and ask whether or not they would still like to proceed. Since the update, the confirm choices do nothing and Safari crashes. This is only happening on the iPad. The functionality works fine on the desktop browsers (IE, Chrome, Firefox, Safari and the Chrome mobile emulator), but crashes safari on the iPad. Is anyone else having this issue?
Here's a screenshot of the crash:
And here's a sample of the code:
this._view.isPrimaryFoodGen().addValueChangeHandler(new ValueChangeHandler<Boolean>()
{
#Override
public void onValueChange(final ValueChangeEvent<Boolean> event)
{
#SuppressWarnings("unchecked")
ValueListBoxWithOldValue<Boolean> vlb = (ValueListBoxWithOldValue<Boolean>)event.getSource();
if (confirmQuestionChange() ){
changeGroupAndQuestions(CONSTANTS.PRIMARY_FOOD, event.getValue());
}
else {
vlb.setValue(vlb.getOldValue());
}
}
});
public boolean confirmQuestionChange()
{
if (!this._view.isImageCriteriaQuestionsVisible())
{ //questions aren't currently visible
return true;
}
boolean confirmed = Window.confirm("Changing this response will delete image data already collected. Do you wish to proceed?");
return confirmed;
}
Any help on a solution for preventing the crash on the iPad would be greatly appreciated. I have tried focusing on another element prior to calling Window.confirm() in hopes that the overlay and the ValueListBox choices would be removed to stop any JS conflicts, but it hasn't worked.
Am I at the mercy of Apple until the next update fixes this?
Or is there a viable solution?
OK, so it turns out that since I couldn't find a fix to continue using Window.confirm(), I had to implement a solution by changing the onValueChange() and confirmQuestionChange() methods to use a manually created DialogBox instead of Window.confirm(). It isn't the optimal solution, but Safari does not crash on the iPad anymore and users can get their work done. Here are the code changes:
this._view.isPrimaryFoodGen().addValueChangeHandler(new ValueChangeHandler<Boolean>()
{
#Override
public void onValueChange(final ValueChangeEvent<Boolean> event)
{
confirmQuestionChange(CONSTANTS.PRIMARY_FOOD, event);
}
});
public void confirmQuestionChange(final String question, ValueChangeEvent<Boolean> event)
{
final ValueListBoxWithOldValue<Boolean> vlb = (ValueListBoxWithOldValue<Boolean>)event.getSource();
if (!this._view.isImageCriteriaQuestionsVisible()) //questions aren't currently visible, can change them no problem
{
changeGroupAndQuestions(question, vlb.getValue());
}
else{
//the following fix was put in place for issues with Safari on the iPad OPS-76
final DialogBox dialogBox = new DialogBox();
dialogBox.setHTML("<center>Changing this response will delete<br />image data already collected.<br />Do you wish to proceed?</center>");
dialogBox.setAnimationEnabled(true);
Button yesButton = new Button("YES");
Button noButton = new Button("NO");
HorizontalPanel dialogHPanel = new HorizontalPanel();
dialogHPanel.setWidth("100%");
dialogHPanel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_CENTER);
dialogHPanel.add(noButton);
dialogHPanel.add(yesButton);
noButton.addClickHandler(new ClickHandler() {
#Override
public void onClick(ClickEvent event) {
vlb.setValue(vlb.getOldValue());
dialogBox.hide();
}
});
yesButton.addClickHandler(new ClickHandler() {
#Override
public void onClick(ClickEvent event) {
changeGroupAndQuestions(question, vlb.getValue());
dialogBox.hide();
}
});
// Set the contents of the Widget
dialogBox.setWidget(dialogHPanel);
dialogBox.setPopupPosition(180, 425);
dialogBox.show();
}
}
Here's a screenshot:
As you can see, the ValueListBox options close before the DialogBox appears and the screen no longer locks.
I'm writing Windows Phone 8 app that needs to get location of device (do not track changes, just get location). I added next code to the method OnNavigatedTo() of my start page but after launching app, the progress indicator does not hide even after 10 seconds timeout. But if I navigate to another page and then go back, everything works fine. This happens on the emulator, I don't have a real device. What am I doing wrong?
protected async override void OnNavigatedTo(NavigationEventArgs e)
{
if(_geoPosition == null)
{
try
{
var geolocator = new Geolocator();
geolocator.DesiredAccuracyInMeters = 50;
_progressIndicator = new ProgressIndicator
{
IsIndeterminate = true,
Text = "Getting current location, please wait...",
IsVisible = true
};
SystemTray.SetIsVisible(this, true);
SystemTray.SetProgressIndicator(this, _progressIndicator);
_geoPosition = await geolocator.GetGeopositionAsync(TimeSpan.FromSeconds(5), TimeSpan.FromSeconds(10));
_progressIndicator.IsVisible = false;
SystemTray.SetIsVisible(this, false);
}
catch (UnauthorizedAccessException)
{
MessageBox.Show("Location is disabled in phone settings");
}
}
}
Thanks!
UPD: just tried to add this code to empty project and it works fine. Tried to comment out some parts of OnNavigatedTo that I did not include to the snippet and found out that the reason somewhere in initialization of data source for this page. I'm sorry for false alarm.
Your code works fine for me, try the classic restart VS and the projecy!
The code should work, tested it with an emulator and a device (nokia 820).
Best of luck