I have coded two servlet(using the channel api) on gae that could make a connection f.ex.: for a chat
As UI I will use JqueryMobile.
My questions are:
How to integrate the actions of the servlets into phonegap?
Should I use any additional libaries or is it possible via action="...\servlet"(RESTful communication).
Is there any best practice?
I appreciate your answer!
Channels API relies on custom javascript that is downloaded from AppEngine when browser opens the page: see javascript docs.
This custom JS code can potentially change when GAE version changes, so you can not embed it into your PhoneGap application. Also it possibly relies on browser-specific features, which is hard to check because it's a closed piece of code and it's internals are not explained.
If you need async notification, I'd suggest you use native push technologies available on PhoneGap.
Read the Channel API documentation. It's all there.
You probably want to add an API to generate a new token in case your connection times out. You also need to handle reconnection from the client in case you get disconnected (ie a socketerror event)
Related
How can I make an online server to access API's and handle requests? Then how can I have my android app access this online server to make requests?
I have an android app that I am building for a school project. This app will need to use multiple APIs to gather information to display to the user. However I don't want to allow people to decompile to source code and take my API keys. My plan is to build an online application that will do all of this work on the server side. This way the user only submits a query and the server sends information in response to their request. This will speed things up for the user and keep the keys from being accessed by other individuals.
Steps I think I need to take.
Set up server to access the API's
Make app access online server through HTTP requests
3....
4...
I have a very general concept in my head, but I'm not sure where to begin. If I'm wrong on any part of this question please correct me.
I do plan on moving this to the app store in the future.
edit: Do you know of tutorials that show the building of the API and then loading it to Amazon AWS or another server?
There are many options when building restful services for api consumption. You could start with php, which is the easiest to start with. Here is a nice tutorial that takes you through the initial stage all the way to the end of building login system for android using mysql and php as the server language. It contains the barebone details of setting up the infrastructure and logic. I think from there you manipulate and go further.
https://www.androidhive.info/2012/01/android-login-and-registration-with-php-mysql-and-sqlite/
check out java rest easy, it is a nice tool to use to build web API's. You can host it for cheap at red shift or amazon using their pay what you use billing.
The cheapest way for you to host your REST API is to use Amazon's API Gateway. You pay for what you use and pay nothing if it is not being used. API Gateway plays very nicely with Amazon's Lambda service that allows you to run discrete code units - again, you only pay for what you use. Lambda itself plays nicely with Amazon's pay-as-you go NoSQL datastores (SimpleDB and DynamoDB).
I am writing an application that requires end user to constantly send updates to our server. I generally use the OKhttom or httpURLConnec clients to make me api calls.
The api call is tied to a button click.
In case my end user has no internet access, is it possible that if he clicks the button to make the request. The request is cached and made later on automagically whenever internet is available?
I can think you can read the Android documentation here and choose the best option for you like:
GcmNetworkManager - docs
JobScheduler (only for API 21+) example
Evernote has released a library which already switch to the best implementation available for the device, i would suggest you to use this without doing everything from scratch: https://github.com/evernote/android-job
I am working in a web application using ASP.net and C#.
My target is to check on a desktop application on the client machine .. If it was exist then I should launch it. Else if it wasn't exist, we should download, install and then launch it.
I could develop this module using Java Applet but unfortunately, Google decided to disable NPAPI in September 2015, So the applet will not working on Chrome.
My question is about the Applet alternatives to help me implementing the above scenario ?
The only (semi) viable option as far as I can see, is to offer the Chrome user a link to a JNLP file for a desktop application. Then when/if the JWS desktop application starts, have it report back to the server 'loaded OK' and then 'target app. installed/not installed'.
On your server, have a time out for waiting on the client to report back. If it passes that time, presume the client machine does not support Java at all and the user is checking some web service to try and figure out what app. opens a JNLP!
After searching about the most suitable way to achieve my goal, I think using custom protocols will be a nice solution to access my client applications from the web page.
This solution is used by many companies such as Microsoft (using mailto: to open Outlook application) and Apple (using itms: to open iTunes application).
The following link is a very good link which talk about a custom protocols:
https://support.shotgunsoftware.com/entries/86754-How-to-launch-external-applications-using-custom-protocols-rock-instead-of-http-
Once Google Chrome was the first to announce that they won’t be supporting NPAPI anymore, they were also the first to provide a new architecture in order to rewrite your code to work on their browser. You can take a look on Native Messaging, which “can exchange messages with native applications using an API that is similar to the other message passing APIs”. The problem is that this approach only works on Chrome, is not something that you can adapt to other browsers.
A more useful approach is FireBreath, a browser plugin in a post NPAPI world. Check the words below from one buddy of the project:
“FireBreath 2 will allow you to write a plugin that works in NPAPI, ActiveX, or through Native Messaging; it’s getting close to ready to go into beta. It doesn’t have any kind of real drawing support, but would work for what you describe. The install process is a bit of a pain, but it works. The FireWyrm protocol that the native messaging component uses could be used with any connection that allows passing text data; it should be possible to make it work with js-ctypes on firefox or plausibly WEB-RTC or even CORS AJAX in some way. For now the only thing we needed to solve was Chrome, but we did it in a way that should be pretty portable to other technologies.”
I would like to repeatedly (every second) ask for the message (object or value) to GAE (if android client did not create or change something there) from another android device. I need to check it pretty fast, but I know that it happens aproximately once in hour.
I use restlet and I don't want to create new thread and poll by get from this thread every second, because this is very battery consuming. I also don't want to use C2DM.
Is it somehow possible to do this? I have found something about NIO nonblocking http connectors here:
http://restlet-code.1609877.n2.nabble.com/Push-data-from-server-using-a-live-HTTP-connection-td2906563.html
But here is described only the client side and I also don't know if this solution would even be possible to use on GAE and how. Does anyone know more about this approach?
Thank you very much in advance.
As the author of uniqush, I created an entry in the FAQ page specific to this question.
Can I use uniqush on Google App Engine?
Yes and no.
If you just want to use GCM on Google App Engine, then there are some code in uniqush-push which you can directly use.
However, because Google App Engine does not support socket connection, there is no way to use APNS. In another work, if you want to setup a server on Google App Engine, you cannot push any notification to iOS devices no matter what software/library you are using.
I did considered to port uniqush to Google App Engine. But because of this fact, I think it may be better to port it until Google let us use client-side socket connections, or provide some way to connect to APNS server.
Again, if you are considering to use Google App Engine as a server for your App, please be aware that you will not be able to push notification to any iOS device right now. If this fact does not bother you, then do it.
Personally, I recommend you to run a server with full control. It is not expensive nowadays. Amazon EC2 or similar cloud products may be a good choice to run uniqush.
As I recommended above, using a (virtual) server with full control would be a better choice if you want to support more platforms besides Android.
If there is any other question, please feel free to reply.
For being future proof I would suggest you have a single push notification service for both kind of devices. You can either build on your own, or leverage something like uniqush or this
Also the Urban Airship's SDK would be a good option to look at, more details here
this is similar to Urban Airship but only a fraction of the cost. The API allows you to send a C2DM message to a user via a call. After you implement the broadcast reciever, when a user installs the app they are prompted to accept the message. If they accept a token is sent to the C2DM server identifying the user. This token is then used to send them a message via the C2DM platform. The Zend PHP Framework has built in functions for this but if reliability is a concern go with an external provider like Remote Queries or Urban Airship
I need to add a functionality to my java-based web application that will allow users to click on a link and the application will automatically call the user and another party and connect them in a phone call.
Does anybody know what would this entail?
Thanks
It can be done with Twilio, and their new, easy Conferencing API. Trust me, it's really really simple. Another option might be CloudVox, but I haven't (formally) tried their service yet.
The World-Wide Web Consortium has an integrated set of speech interaction standards that you'll find interesting. There's a markup language called VoiceXML that is analogous to HTML in that web applications generate it. It differs from HTML in that it's specialized for temporally-based speech interactions instead of visual interactions. So instead of looking at a screen you listen to audio prompts and computer-generated speech. Instead of typing and mousing, you speak back and what you say is processed by a speech recognizer or recorded.
There are many companies using VoiceXML to automate voice response systems, and they handle billions of calls per year. You've probably talked to them many times without realizing it. One of the best companies in this space is Voxeo, and they have a developer site at http://evolution.voxeo.com/ that you can play with. Evolution lets you call your web application over an ordinary phone (or Skype). You actually talk to a VoiceXML-based web browser which will fetch a VoiceXML page from your Java application server, "play" it to you, listen to what you say, and then report that back to your app via a form submission, get the next page to render to you, etc.
Another related standard is CCXML, or Call Control XML. You use this to create teleconferences that may or may not include a voice response application.
So it sounds like in your case you want your standard web application to talk to a CCXML server and ask it establish call legs to the web user and to a customer service line. I know that Voxeo Evolution offers CCXML as well.
There are other good companies in this space too. One that comes to mind is TellMe, which was bought by Microsoft a year or two ago. These two companies (and others) offer professional services too.
So I wanted to write this up as an answer to the comment above. The Skype API provides a number of options for telephony in COM, Java and Python:
Skype4Java - https://developer.skype.com/wiki/Java_API
Skype4Py - https://developer.skype.com/wiki/Skype4Py
Skype4COM - https://developer.skype.com/Docs/Skype4COM
They provide a communication and command protocol layer for working with Skype, more info on the API here:
https://developer.skype.com/Docs/ApiDoc/Overview_of_the_Skype_API
It's kind of different for every platform, the Linux version is based on DBus or X11.
Try FreeSWITCH. I have done this before. Its pretty straight forward. Can be a bit hairy when you need to log call accounting and all those stuff. I hopefully would be able to provide you some guidelines and code samples, let me get home first. Cheers.
The good thing in using FreeSWITCH, you will be able to handle multiple calls, and quite a number of. You might need that in future.
Note: You have to use some kind of VoIP provider in order to do that. I was using Gizmo5 that time and it was pretty good.
Sorry buddy, lost the servlet code somewhere. But no worries it was a simple servlet. Fortunately, I had added my example Java code for XML-RPC, into the FreeSWITCH wiki, and actually that was the code my servlet was invoking down the road. Below is the snippet.
XmlRpcClientConfigImpl config = new XmlRpcClientConfigImpl();
XmlRpcClient client = new XmlRpcClient();
try {
config.setServerURL(new URL("http://localhost:8080/RPC2"));
config.setBasicUserName("freeswitch");
config.setBasicPassword("works");
client.setConfig(config);
// For external phone calls using VoIP. We will use something like below.
// new Object[]{"originate", "sofia/gateway/gizmo1/6098989898 &bridge(sofia/gateway/gizmo9/0116054545454)"}
// gizmo1, and gizmo9 are the accounts configured under freeswitch gateway configuration.
client.execute("freeswitch.api", new Object[]{"originate", "sofia/internal/1001 &park()"});
} catch (Exception ex) {
ex.printStackTrace();
}
Moreover, you need to configure few things prior doing this. You need to set up the gateway using your VoIP provider settings.
For FreeSWITCH related help, take a look at this SO Thread.
I know of 2 API providers that does what you need:
1) twilio - can connect to 2 or more parties using TwiML (their markup). example
2) Hoiio - very easy to use with 1 line of RESTful api call. example