I am working on a webview client app in Android Studio.
I have a working splashscreen.
I want to check the internet connection, or check if the webpage is available.
If not, then go to another activity than my webview activity.
You can do a simple thing load the webpage using custom WebViewClient overriding onPageError Method and starting The Activity in That Method.
class CustomWebViewClient extends WebViewClient(){
onReceivedError(WebView view, WebResourceRequest request, WebResourceError error){
startActivity(new Intent(this,Your_Second Activity.class));
}}
And set WebView Client Like
webview.setWebViewClient(new CustomWebViewClient());
Related
The docs for RefreshIndicator suggest you can programmatically trigger the refresh behaviour via the RefreshIndicatorState class.
How do I access an instance of this class, assuming I've added a RefreshIndicator widget to my application? I can't see a property to access it and I'm assuming createState() is only used by the Flutter framework.
To avoid an XY problem, I should explain my reason for doing this is to perform a visually pleasing refresh of my list when my user first opens the app. The list will be empty initially and the refresh will poll my server for data.
See https://docs.flutter.io/flutter/material/RefreshIndicatorState/show.html and a usage example in the Flutter Gallery
Essentially
var indicator = new GlobalKey<RefreshIndicatorState>();
and then
indicator.currentState.show();
after it's built.
I have a Line-of-Business (LoB) Windows 8.1 Store application I developed for a client. The client side-loads it on several Windows 10 tablets. They use it in an environment where WiFi is spotty at best and they would like to get some sort of notification inside the app, regardless of what page they are on, notification that will let them know that they've lost connectivity to the network. I have created a method on my Web API that is not hitting the repository (database). Instead, it quickly returns some static information regarding my Web API, such as version, date and time of the invocation and some trademark stuff that I'm required to return. I thought of calling this method at precise intervals of time and when there's no response, assume that the Web API connectivity is lost. In my main page, the first one displayed when the application is started, I have the following stuff in the constructor of my view model:
_webApiStatusTimer = new DispatcherTimer();
_webApiStatusTimer.Tick += OnCheckWebApiStatusEvent;
_webApiStatusTimer.Interval = new TimeSpan(0, 0, 30);
_webApiStatusTimer.Start();
Then, the event handler is implemented like this:
private async void OnCheckWebApiStatusEvent(object sender, object e)
{
// stop the timer
_webApiStatusTimer.Stop();
// refresh the search
var webApiInfo = await _webApiClient.GetWebApiInfo();
// add all returned records in the list
if (webApiInfo == null)
{
var messageDialog = new MessageDialog(#"The application has lost connection with the back-end Web API!");
await messageDialog.ShowAsync();
// restart the timer
_webApiStatusTimer.Start();
}
}
When the Web API connection is lost, I get a nice popup message that informs me that the Web API is no longer available. The problem I have is that after a while, especially if I navigate away from the first page but not necessary, I get an UnauthorizedAccessException in my application.
I use the DispatcherTimer since my understanding is that this is compatible with
UI threads, but obviously, I still do something wrong. Anyone cares to set me on the right path?
Also, if you did something similar and found a much better approach, I'd love to hear about your solution.
Thanks in advance,
Eddie
First, If you are using Windows Store Apps, then you could possibly use a Background task to check poll for the status of the web api instead of putting this responsibility on your view model, its not the viewmodels concern
Second, if you are connecting from your Windows store app to your API then one successful authentication/ authorization for the first time, how and where do you store the token (assuming you are using token authentication). If you are (and ideally you should), is there a timer that you start which is set to the token expiration time? Is your local storage getting flushed somehow and loosing the aurthorization data?
Need more information.
I have an adobe AIR AS3 application for both Android and iOS. I have implemented all the necessary code with the help of revmob's great technical support team. My problem now is if the user originally was not connected to a wifi or cellular network, the session won't start, thus the banner won't show nor the video, which is normal.
The problem is, when the user switches back to connected, the banner won't show, so i'm guessing the session didn't start.
How can i keep trying to start the revmob session, depending on when the user gets connected? in other terms, how can i restart the session as soon as the user gets connected?
You can see how to create a ConnectionChecker class to check for a internet connection in this link . After creating a ConnectionChecker instance, you can call it and call the startSession method when connection is successful.
Following the link, your code will look something like this:
var checker:ConnectionChecker = new ConnectionChecker();
checker.addEventListener(ConnectionChecker.EVENT_SUCCESS, checker_success);
checker.addEventListener(ConnectionChecker.EVENT_ERROR, checker_error);
checker.check();
private function checker_success(event:Event):void {
// There is internet connection, so call startSession
revmob = new RevMob(< YOUR_APP_ID>);
}
private function checker_error(event:Event):void {
// There is no internet connection, do nothing
}
Best regards,
I was trying to recreate the simle Text to Speech example used on the MSDN website. However whenever the code came to create the instance of the SpeechSynthesizer class it failed with a Unauthorised Acception error when running on the WP8.1 emulator. I currently do not have an actual device to test on to see if this makes a difference.
My code was simply:
private async void TTS()
{
// The media object for controlling and playing audio.
MediaElement mediaElement = new MediaElement();
// The object for controlling the speech synthesis engine (voice).
var synth = new Windows.Media.SpeechSynthesis.SpeechSynthesizer();
// Generate the audio stream from plain text.
SpeechSynthesisStream stream = await synth.SynthesizeTextToStreamAsync("Hello World");
// Send the stream to the media object.
mediaElement.SetSource(stream, stream.ContentType);
mediaElement.Play();
}
I know there was an issue with the SpeechSynthesizer in Windows 8.1, and I found solutions to this when looking to fix the problem, but found little about the problem with WP8.1 SpeechSynthesizer. Has anybody else came across this problem and found a fix?
You should add one DeviceCapability in Package.appxmanifest file:
In DeviceCapability Tab, check the microphone, because it will provides access to the microphone’s audio feed, which allows the app to record audio from connected microphones.
Look at this library: App capability declarations (Windows Runtime apps)
in my windows phone 8 application i am using custom uri association to launch another application through my phone.
i.e
await Windows.System.Launcher.LaunchUriAsync(new Uri("sixtag:"));
but my app is not able to get certified for store because of this. the testing team tells that you app terminates unexpectedly while executing this.
now, i don't know how to deal with this.
is there any way to throw exception if the app which i am launching is not installed on phone ?
or i should try something else so my task gets accomplished and app gets certified for store as well.
You do not need to wrap your launch in try/catch or check for success as described in the other answers. As soon as you call LaunchUriAsync, the platform takes over and will automatically handle the possibility of no app being installed by asking the user if she wishes to search in the store.
A couple of things to double-check:
1) Ensure that you can successfully back into your app following the navigation to sixtag.
2) Ensure that your call to LaunchUriAsync is the direct result of a user action (eg. tapping a button)
try
{
await Windows.System.Launcher.LaunchUriAsync(new Uri("sixtag:"));
}
catch
{
MessageBox.Show("please install Sixtag from the app store","AppMissing", MessageBoxButton.OK);
}
you can perhaps display another button and on clicking directly navigate to the app store. See if this solves your problem. Do vote it up if it does :)
You are needed to handle that as shown here . Also Read out Remarks given there.