touch-event | 易学教程

Handling Touch Event in UILabel and hooking it up to an IBAction

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Ok, so I have a UILabel created in interface builder that displays some some default text of "tap to begin". When the user taps the UILabel I want it to trigger an IBAction method: -(IBAction)next; which updates the text on the label to say something new. It would be really convenient if this allowed me to simply drag a connection from my method to my label and then select touch up inside, as with a button. but alas, no cigar. so anyways, I guess my question is, am I going to have to subclass UILabel to get this to work? Or is there some way I can drag a button over the label, but make it 0%

What is the difference between the click and tap events?

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问题 I am developing an app that runs on Android/iOS and desktop computers. Should I use the click or the tap event? What are the differences between them? Will the 'tap' work on desktop? if not, (and I have to use click ) am I missing any advantages that the tap has over the click ? 回答1: Touch events and mouse events are entirely different beasts. They are not interchangeable. That said, I'm using jQuery Touch Punch which maps touch events to their mouse event analogs, so a tap becomes the same

Pass touches to the view under

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问题 In my app I have a fragment on top of the activity. The fragment is filling the whole screen. Part of the fragment is a transparent View and you can see the views under (that belong to the activity). Is there a way to transfer the touch events to the views that are under the transparent View of the fragment? Thanks! 回答1: In your overriden onTouchEvent method inside the fragment return false , it passes the touch event to the lower layer views. 回答2: simplest way : from here : https:/

jquery touchstart in browser

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问题 As touchstart/touchend is yet not supported in most of the desktop browsers. How can I create touchstart event that will be the same as mousedown event (that is supported in all browsers). I want something like this $('obj').bind('touchstart', function(e){ }); will be translated into $('obj').bind('mousedown', function(e){ }) 回答1: You can bind both at once... $('obj').bind('touchstart mousedown', function(e){ }); If you want to mousedown event to fire touchstart events automatically (so you

How to distinguish between move and click in onTouchEvent()?

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In my application, I need to handle both move and click events. A click is a sequence of one ACTION_DOWN action, several ACTION_MOVE actions and one ACTION_UP action. In theory, if you get an ACTION_DOWN event and then an ACTION_UP event - it means that the user has just clicked your View. But in practice, this sequence doesn't work on some devices. On my Samsung Galaxy Gio I get such sequences when just clicking my View: ACTION_DOWN, several times ACTION_MOVE, then ACTION_UP. I.e. I get some unexpectable OnTouchEvent firings with ACTION_MOVE action code. I never (or almost never) get sequence

How to add a gesture detector to a view in Android

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问题 I was struggling with adding a gesture detector to a subview in my project. Do I override the parent's onTouchEvent or the child's onTouchEvent ? Do I make an OnTouchListener and add the gesture detector there? The documentation shows an example for how to add a gesture detector to the activity itself but it is not clear how to add it to a view. The same process could be used if subclassing a view (example here), but I want to add the gesture without subclassing anything. This is the closest

Android overlay to grab ALL touch, and pass them on?

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I'm basically trying to get all touch event data from something like a system overlay, move my sprites around based on this touch data, then allow the OS/homescreen/browser to act upon the data as it should(or vice versa). I have found similar questions, but nothing that leads me anywhere I haven't already been: Getting the View that is receiving all the touch events (Implemented, with results below) Creating a system overlay window (always on top) What I can do: I can EITHER grab ALL the touch events and act upon them by moving my sprites and not allow the OS/homescreen/browser to see any of

How to vary between child and parent view group touch events

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问题 I decided to post this question and answer in response to this comment to this question: How to handle click in the child Views, and touch in the parent ViewGroups? I will paste the comment here: Suppose I want to override the touch events only for handling some of the children, what can I do inside this function to have it working ? I mean, for some children it would work as usual, and for some, the parent-view will decide if they will get the touch events or not. So the question is this:

Add Marker on Android Google Map via touch or tap

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问题 I want to develop a Map Application using Google Map on Android. Now, I want to add marker on the map via Touch or Tap on the Map. How do I apply touch event to drop the marker on the map? 回答1: This code is Successful run I am working on that code this code is for Dynamic Draw I think this code help you more for Static or dynamic both places you can use this code double latval = Double.parseDouble(jsonobject.getString("lat")); double longval = Double.parseDouble(jsonobject.getString("lon"));

Get Canvas coordinates after scaling up/down or dragging in android

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问题 I'm developing an application in which I'm pasting images, doing drawing and painting on canvas. This app can also Scale up/down the canvas or drag it to different location. My problem is: I can't get the correct canvas coordinates after scaling or dragging the canvas. I want to draw finger paint after the canvas is scaled or dragged but unable to retrieve the right place where i've touched..:( Also I'm new bee. Here is the code. @Override public void onDraw(Canvas canvas) { super.onDraw