Probably a simple question, I can call a native function from the JavaScript, for example:
Android.setVolume(0.7)
However, I do not know how to trigger (from Android/Java), or handle events (JS) that are not caused by user interaction, for example, alerting the JS when the user's network state changes, the battery gets below a certain point etc.
Any help greatly appreciated.
However, I do not know how to trigger (from Android/Java), or handle events (JS) that are not caused by user interaction, for example, alerting the JS when the user's network state changes, the battery gets below a certain point etc.
As with the answer you linked to, use loadUrl() with a javascript: URL, akin to how a bookmarklet works.
The answer is over a year old and is labelled as a hack, is this still the best way to do it?
I am not completely clear why the author of that answer described it as a hack. Certainly, it's viable and is used a fair bit.
Related
some one suggested this but i am not able to implement it can any one can help me by providing the desired code in kotlin..
Another solution can be to call
UsageStatsManager.queryEvents
with the start of the day as first parameter and the current time as end parameter and then filter the results to check just the
UsageEvents.Event.SCREEN_INTERACTIVE UsageEvents.Event.SCREEN_NON_INTERACTIVE
events
take the timestamp of each of them and sum all the time passed between each
SCREEN_INTERACTIVE -> SCREEN_NON_INTERACTIVE
events, this would easily show how much time the screen was interactive, so screen on and the touch enabled.
There is a possibility that you'll have a SCREEN_INTERACTIVE event that doesn't have any related SCREEN_NON_INTERACTIVE, this is when the
UsageEvents.Event.DEVICE_SHUTDOWN
event happen, luckily this event is in the same list returned by the queryEvents method
remember also to declare and make the user to allow the android.permission.PACKAGE_USAGE_STATS permission as stated here
ps. i haven't used this yet but looking at the documentation it's the right thing to use, probably the one used by the android settings pps. look also to the other events in the same package, they might be helpful to what you want to accomplish
Is there any way in java to make code: Example if someone clicks on skipAd on adf.ly link Int will increase. Example 2: I click the button, it will take me to a adfly link. and when i click skipAd on adf.ly: in the app int will increase for 1(int++).
Is there any way to do that?
First of: StackOverflow hates it when people come here showing that they have taken zero effort to find a solution for the problem.
Secondly:
Your question is very unspecific.
Are you and your friend on the same network? If so, you might want to consider using ARP-Poisoning in order to inject custom JavaScript into the webpage that will function as an EventListener. Obviously this will only work if he is visiting AdFly via an HTTP connection and since Adfly-Links are generated with an HTTPS prefix, you will rarely find people using HTTP (despite the fact that they still don't enforce HTTPS, grumpf).
There are probably tons of other solutions but they will all involve tinkering with his/your webtraffic. And no offense, but I feel like you should probably learn some more Java before taking on such a big task.
More than in 'java' it would be easier to do it in 'JavaScript'. You'll have to monitor the onClick event of that SkipAd button and then you can increase your counter.
I advise you to make your question even more clearer in why-you-have-to-do-it department to avoid down votes
I'm working with Java and JSP. I have to create something like a promotion which has start date and end date. Within the start date and end date, it will show a form that is corresponding to the promotion; otherwise, it will be just show a normal page. I have done the validation based on the time they open the page. I can manipulate the time in Unit Testing by making the current time to any time I want.
However, the problem is when I want to pass this to client to test. They want to see how it's like on the promotion day? Does the promotion really show on a particular time? Does it really close afterwards? One possible way is to secretly pass current date as HTTP param when trying to access the page. Doing so, client can check how the system behaves on a particular day but it's very dangerous indeed. Anyone who knows this will be able to access the promotion anytime they want. I don't know what the best way to handle this.
What's your suggestion?
It sounds like a bad idea basing ANY of your JSP (server-side) code on time being sent from a client. It would be much better to handle this entirely server side and have some way of configuring the time via which you and your client can do testing.
1) if the client is really concerned (or your application is complex) - it may be that the ONLY way to do such a test reasonably is to change the server time as suggested by Nathan Hoad's comment. Every other test comes with confidence since it relies on something other than the time ticking over and "triggering" the promotion to start or end. Also keep in mind the activities that occur during the promotion - do they use the system time to make decisions or store the date/time in a database etc?
2) if #1 isn't a real issue I would have your code that checks the time (for the trigger of the promotion) to call a custom function in your code (eg. getCustomTime()). That method will by default return the system time, but also checks to see if an offset has been configured and use that to offset the actual time. The offset can be dynamically configured.
Good luck.
Firstly, you shouldn't be putting this functionality onto a live production server, so the "very dangerous" exposure shouldn't happen.
I'd try a "belt and braces" approach:
Set up a demo server that only has read-only access so can't do any damage
Tell the client the secret parameter to use
Have the "client promotion demo" feature switchable on/off from an admin console
(If you're really nervous) limit access to only the client's IP
The client can access the demo box and check everything works perfectly. When they are happy, you deploy to production, but with the "demo mode" disabled, so only the "time-sensitive" way of accessing the promotion will work.
You don't have to tweak the time on your server to demo this to the client. Just have a promotion that is expired in the system, one that is currently active and another that is in the future on three different items, and show the customer the effects.
Either that, or create a promotion during your presentation that takes effect one minute in the future, lasts for 2-3 minutes and then expires, then talk through it and click around and show them the effects.
While registering to a website, it has 2 fields. Email and email confirmation.
The thing is, people are copying what they're writing on first field and pasting on the other field.
I'd like to disable it, is it possible?
<h:inputText id="email" value="#{registerBean.email}" maxlength="60" />
One of the most important things to track in UI design (if you care about a consistent user interface) is all of the nuances which people come to expect.
If you disable the "copy" hot key sequence, then many people will feel frustration because your interface doesn't conform with the nuances that hold for the rest of the operating system. While I understand why you might want to do this, that's not going to convince people that your code isn't broken. After all "Ctrl+c" works every where else.
Once you deviate from enforcing expected UI control nuances, then you need to indicate where the nuance is permitted and where it is denied. That's the DEFINITION of an inconsistent user interface. As the user isn't going to have you there to explain the "why" when the UI does something that they don't expect, they will invariably consider it a bug. If they did have you there telling them why they couldn't do something allowed in every other part of their operating system, they will invariable consider you overzealous in enforcing something stupid which everyone else allows.
The solution is to use a better solution. Enforce what is already expected to reduce the learning curve, or select something (OpenID has been mentioned) that sidesteps the objectionable task(s).
This page suggests the following solution:
<script language="javascript">
function onKeyDown() {
// current pressed key
var pressedKey = String.fromCharCode(event.keyCode).toLowerCase();
if (event.ctrlKey && (pressedKey == "c" || pressedKey == "v")) {
// disable key press porcessing
event.returnValue = false;
}
} // onKeyDown
</script>
I should add though, that in general it is impossible for a webpage to tell the client browser to "disable cut and paste".
Btw, I never use Ctrl+C for copying text. I'm on XWindows so simply selecting the text will copy it. If I'm on a windows system I usually do Ctrl+Insert
I'm thinking that this question is pretty similar to yours: Disable pasting text into HTML form
My summary of the answers: You can, but it's messy and it's poor UI design. They also have some good suggestions for better UI design.
Please don't do that. I hate having to copy my email address, and if I actually had to type it twice, I would just leave unless I was being forced to make an account for some reason.
I have a simple ajax game between 2 users with java backend (tomcat, spring). I need some good way of notifying one user that his opponent made a turn. Now all communication is done through database and waiting for opponent to finish his turn looks like this:
while(!timeout && !opponentIsDone) {
//...get the game record from db and check if opponent made turn
Thread.sleep(100);
}
Can I somehow get rid of this loop with sleep() and get instantly notified without a delay (but with timeout)? I can probably make some global static var and communicate through it, but I still will need similar loop only maybe timeout will be smaller.
I can't just call some method once the turn is done because it is all need to go to the browser through ajax and I can't push data there, only pull. So I need to have process that waits for the opponent.
I am looking for some light and simple solution.
Thanks.
You may want to look into Tomcat's advanced IO (Comet) support.
http://tomcat.apache.org/tomcat-6.0-doc/aio.html
I think you're looking for the Distributed Events (aka Subscriber/Publisher) pattern, and I believe Dojo Framework has implemented it:
http://ajaxpatterns.org/Distributed_Events
There are many ways to push notifications to a web client. Gmail's IM client is an excellent example of this sort of thing. This is often accomplished by holding an open HTTP connection in some manner, and this family of techniques is referred to as COMET. Wikipedia has an article on it, and there are blogs dedicated to the subject ( http://cometdaily.com/ ).
Even if you didn't use this technique, there are still many improvements you can make to the algorithm you identified in your question. One way would be to use a wait/notify sort of pattern or a subscriber/publisher approach. Another would be to return a "waiting for other player to make a turn" page immediately, and have that page automatically refresh every few seconds until the other player has taken his turn.
I think the solution you're looking for is COMET-style notification, though.
If you had a global static var of some sort, you could use a java.util.concurrent.BlockingQueue<T>
BlockingQueue<Turn> handoff = new ArrayBlockingQueue<Turn>(1);
// opponent thread
handoff.offer(myTurn);
// other thread can use
Turn otherTurn = handoff.poll( 90, TimeUnit.SECONDS );
if ( otherTurn == null )
// then no turn made
You can easily make the people wait for each other by using SynchronousQueue instead of ArrayBlockingQueue.
and of course it doesn't need to be global static -- it could be anything accessible to both users.
flex/flash has a real-time chatroom system (using remote-object programming).
you have to install BlazeDS (free) http://opensource.adobe.com/blazeds/, it comes with sample application. This is called AMF technology. I think Spring does support this AMF in one way or another.
http://www.adobe.com/devnet/livecycle/articles/blazeds_spring.html
http://blog.springsource.com/2008/12/17/using-spring-blazeds-integration-m1/
It's good for Flash based website. However, if you don't want to use flash, i think u can hide it or make it small enough, just to use it as a communication channel on your page.
Perhaps you have to find a way to notify your webpage/javascript after flash receive data from server.
Yeah, I know this method is a bit hacky, and it's not a clean way of doing thing :) just to provide an alternative for you.
DWR (Direct Web Remoting) is a package that allows you to make Java methods on the server directly available to Javascript (by creating a proxy). It has a feature called "Reverse Ajax" that is an easy way to handle push scenarios.
Perhaps consider Jetty Continuations if you aren't locked into Tomcat?
http://bill.burkecentral.com/2008/11/12/buggybroken-tomcat-6-comet-nio-apis/ has some discussion about Tomcat NIO