Android :: Itemized Overlays - Not Drawing Collection But Refreshing?
Apr 22, 2010
I'm trying to write code that draws accuracy circles around a gps location based on a time param. I have no problem setting up the GPS, or of calculating how to draw the circles.What's been killing me is that the Overlays always overwrite one another.So I can never have more than one circle.I've looked at all the examples and tutorials online but they seem to be obsessed with putting in icons or with Drawing from some database or array.If I understood correctly I should be able to do itemizedoverlays and just draw as i go without having to track each readout in an array.
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Nov 15, 2010
I've got a game, a custom View class draws my gameboard. I'm thinking of drawing some elements on a separate layer above the gameboard. I could do this in the View's canvas code, but since they won't change frequently, was thinking of introducing a frame layout to display this top layer.I'm not sure which route to take, the only reason I wouldn't do the FrameLayout is because I'm not sure if it has an impact on battery life. Everytime onDraw() is called, the system probably has to do an alpha composition of the two layers. Is that more battery consuming than drawing the elements from that layer myself in my canvas on every frame? Hard to answer since I'm not sure how complex the drawing will be yet, any general opinions?
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Sep 23, 2010
I've searched here and on the interweb, but cannot find out how to add overlays (.kml files) into Maps or Earth. Can it even be done (shame if not) and if so, how do I do it.
EDIT: I've tried MyMapsEditor, but that doesn't run on Froyo.
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Nov 18, 2010
I am searching for functionality which works like the itemizedOverlay on the mapview, only for Imageview. So that I can add items on specific locations on the image and trigger actions on tap of the item. I am building an application for Android where you get Floorplans and on this Floorplan the rooms should be marked and clickable to get more information.
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May 31, 2010
To describe my problem, everytime my location changes, it redraws the center maker on the map. Only catch is that it doesn't delete the previous one. I can get it to delete the previous one when the location is changed, but I have no idea how to pass the original overlay in-between classes.
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May 20, 2010
I cannot figure out the origin of the ConcurrentModificationException. In my activity I'm calling
updateMapOverlay(). I'm also calling updateMapOverlay() inside another Thread (a TimerTask) that is invoked on regular intervals. I'm taking the appropriate locks when invoking updateMapOverlay() from both the threads. Is this problem being caused because I'm invoking updateMapOverlay from inside a non-UI thread (i.e., TimerTask).
private void updateMapOverlay() { this.itemizedOverlay.refreshItems(createOverlayItemsList());
List<Overlay> overlays = mapView.getOverlays(); overlays.clear();
overlays.add(cotItemizedOverlay); this.mapview.invalidate(); }
Exception:
W/dalvikvm(10641): threadid=3: thread exiting with uncaught exception (group=0x4001b180)
E/AndroidRuntime(10641): Uncaught handler: thread main exiting due to uncaught exception
E/AndroidRuntime(10641): java.util.ConcurrentModificationException....
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Mar 19, 2010
i want set the visibility to itemized overlay in map view. if the zoom level is less than 10 i want to set visibility of overlay is GONE else VISIBLE. how to do that? and also cant set zoom level Listener.
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Jun 4, 2010
I have a particular collection of code along with some XML files that I need to share with every application I will make.
At the moment I can't because as far as I am aware there is no way to do this. This seems like a massive oversight by the development team.
If the code needs changing, I have to change it in every app that I create - and will create in the future.
Are there any ways to share code in android yet? I am using Eclipse for development.
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Jul 17, 2009
What would be the best way to access the USB as a serial port on a android device (HTC Magic) ?
I am thinking about a OBD-II interface, can I do this on a startdard phone or more likely I'll need a modified firmware ?
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Jul 17, 2010
What I am trying to do - I am continuously getting a stream of lat/lng positions, I want to move a overlay item dynamically on the map based on the lat/lng in the stream. I am displaying the location of moving object dynamically on the map
I am putting my whole code in a while(true) loop and trying to read the stream every 5 seconds and refresh the overlays on the map. But overlay items are not shown until the function (either oncreate, or any onclickeventhandler etc) is completed. For example, test code, I am adding a single test overlay item when ever the user clicks on a button. If I put a wait(2000000) "after" I add overlays and invalidate the map, the overlay is not displayed until the time has elapsed and the function is completed.
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Nov 2, 2009
In my app I am drawing bus routes on top of a MapView. The routes have anywhere between a dozen and a few hundred GPS coordinates that describe the route that the bus takes. The problem I'm having is that once I draw out all these lines panning/zooming the MapView is incredibly slow (even clicking the 'Back' button takes a minute to happen). I'm not sure how relevant it is, but I put in some debug code then checked the logcat output and the MapView is repeatedly calling the draw() method of the Overlay whether anything has changed or not. This is happening several times a second and is causing a massive amount of garbage collection to happen (2-3 MB every second).
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Sep 28, 2009
My problem is my MapView becoming very laggy and so non-responsive at times, that Android thinks its hit deadlock and tries to close it.
I am adding 60 overlays to the map view and i originally thought that the icon size may be causing the problem by using up all the memory. When i decreased the overlay icon size, it did improve things, though it is still to slow to be usable. Has anyone experienced anything similar and have a workaround? There may be a better way of doing it other then extending the Hello MapView example.
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Sep 12, 2010
I have the following code to add an Overlay
myMapView.getOverlays().add(sites);
myMapView.invalidate();
I also have the following remove code where sites is a global variable.code...
Sometimes I am left with duplicates so would like a way to remove all overlays from a map, is this possible?
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Jan 8, 2009
Ok before you start salivating and jumping up and down like a hysterical clown, read the following disclaimer
"At the moment you can not do this, but very soon you will. In fact it is being developed as we speak"
Still interested? Read on
Mozilla, our (second) favourite web browser has had an open source media library and player for some time ( called songbird ). The interface looks cunningly similar to i-tunes, and keeping in tradition with mozilla's theme and addon creation the plugins, themes and addons are pouring in.
According the their roadmap support for extrnal USB devices like mp3 players, cellphones and PDA's is coming very soon, in the next development phase. Which means one thing for you and me, the ability to sync our media collection with our G1's
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Sep 4, 2010
Now that girls in home, girls on river, etc have been removed from the market can someone tell me where I can find them?
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Aug 14, 2010
Does anyone have any of andrew bells android google mini figurines that they don't want. I'm looking to buy some specific ones.
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Jun 6, 2010
I'm writing an Augmented Reality codes that should works in realtime,
But the VM's garbage collection hinders my program's performance.
I checked my program's execution time for each in OnPrevFrame(byte[], Camera)
and it execution time increases from around 50ms to 120ms at just after each garbage collection.
I copied parts of logs below. (local time is just before and after of signal processing, and global time is time stamps for every onPreviewFrame() calling )Also I executed onPreviewFrame without any signal processing on it, but
the garbage collection is also carried showing debugging message around 60ms it spends for memory release.
Is this garbage collection come from releasing byte[] yuvs image data? ( i uses 320x240 thumb nail )
then this clearly comes from Java's limitation, so there will be no hope for improvement unless
I found a way to directly access camera device? do you think this is feasible? Hope listen to others' comments.
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Feb 14, 2010
i have a problem with my mapView. my app reads "some" gps points out of a file and i want to draw a route (drawing lines between the gps point). If my file contains many gps points, my app works really slow. i think its working slow, because i draw all overlays. now i want to check, whether a point is visible in my mapView or not. so i have to get the mapCenter and Lat/lon span (getLatitudeSpan,..) !? how and where must i save my points and how can i check all my points (after my mapCenter has changed for example). Shall I save my points in a list (in my Overlay class??) and iterate through every list item and check, wheter its visible or not?
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Oct 29, 2009
I've been reading the (shoddy) documentation for the Google Maps API (MapActivity et al), and I think I have roughly worked out how it works. It seems that if you want to add a marker overlay you can use ItemizedOverlay easily, but you have to add all your markers at once. There doesn't seem to be any way to remove them.
What I want to do is query markers from an online database as the user pans around (in the same way the actual map tiles are fetched). Is there a simple way to do this?
As far as I can tell I need to subclass Overlay and implement the draw method, but where is the best place to put the code that fetches new markers when the map is panned? There doesn't seem to be an onMapChanged() method anywhere. My best guess is MapController.onKey() but that seems wrong.
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Feb 17, 2010
I'm seeing a bug with overlays on MapView with the Nexus One. Pinch and zoom multitouch gestures don't scale my overlays until the user releases the gesture, at which point the overlay redraws itself. In contrast, the My Location overlay in Google Maps WILL scale during the gesture. Is there a way to fix this in my app, or is this a MapView bug?
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Mar 1, 2010
I followed the instructions from the google hellomapview tutorial. I get a working mapview etc. But the two items that are added to the map are not shown. It seems they are there somewhere because tapping at the specified location shows the message that was added to the items.
Here is my source code. It should be very close to the google tutorial source code.
CODE:.............
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Nov 24, 2010
I want to do the following and am kind of stuck on these for a few days:
1) I was trying to draw poly lines ( I have encoded polylines, but have managed to decoded those) that move when I move the map(the only solution that I found was for Geopoints to be transformed into screen co-ordinateswhich wont move if I move the map !)
2) I have used helloItemizedOverlay to add about 150 markers and it gets very very slow.any idea what to do ? I was thinking about threads(handler)
3) I was looking for some sort of a timer function that executes a given function, say, every 1 minute or so.
4) I was also looking for ways to clear the Google map from all the markers/lines etc
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Apr 17, 2010
I have a map in my android application that shows many markers (~20-50). But the app performs very poor when i try to scroll/zoom (in Google Android Maps i did a sample search for pizza and there were also some 20-50 results found and i didn't notice any particular performance problems when zooming/scrolling through the map).
onCreate() {
....
drawable = this.getResources().getDrawable(R.drawable.marker1);
itemizedOverlay = new MyItemizedOverlay(drawable,mapView);
...
callWebServiceToRetrieveData();
createMarkers();
}..............................
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Apr 14, 2010
I have a ImageView and draw some things on that view. Now I want to have the position of the click in the onClickListener. Although I think that's not really possible (storing the position in the onTouchListener is not working), I want to ask, if there is any other way to accomplish that? The goal is to have a image with some overlays, that should be clickable. I thought about AbsolutLayout, but that is depracated, so what now?
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Oct 1, 2010
The Android the MapView Overlay class mentions two draw methods. One regular, and one for animated overlays.
I have tried to find more information on how to animate overlays and use this second method, but it all keeps coming back to the same forum postings. Can anyone explain how you specify to the MapView that a certain Overlay should be animated? How do you specify the manner in which it animates?
If it's relevant, I'm currently trying to draw pins in the map that update in realtime with streaming GPS locations for objects. I get new data every two seconds and need to tween the locations by having the pins move in a simple straight line between coordinates.
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Dec 28, 2009
I'm drawing a rect to a surfaceview. Nothing special, just a test like this, in the surfaceview-extended class:
private int mPosX = 0; private Paint mPaint = new Paint(); Code...
the rect just bounces around the screen. I'm watching DDMS, I still see the garbage collector being called, even with this simple draw loop. There is no other application code being executed.
I'm wondering if it's realistic to expect the gc to not be called at all if we take care to not allocate any objects during our draw loops. I'm trying to extend this example to do some smooth animations, but every once in awhile the gc is called and you can see the drawing stutter. Although none of my application code is allocating any new objects, I don't know what the underlying API is doing inside surfaceview etc, and I doubt we can control that. Just wondering if this is not possible, I'd prefer to abandon this game idea up-front if we can't guarantee smooth animation.
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Feb 23, 2010
I've got a class called PhoneContact with 3 properties:
Title, Description and PhoneNumber
If I have a collection of these, how would I go about binding these to a ListView containing a TextView for each property?
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May 25, 2009
I am developing a camera application , where the frame rate is important. However, camera uses a preview callback function which allocates a byte[] array of 230400 bytes, which makes it necessary for the garbage collection to step in. Can someone suggest me a way to avoid garbage collection stepping in?
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May 20, 2009
Hi, I have discovered while using DDMS that the basic OpenGL system calls in my code are allocating memory and causing the garbage collector to fire! It's not the system calls themselves causing the problem but the use of direct byte buffers to pass data in.
The direct byte buffers I use in calls such as glVertexPointer & glTexCoordPointer lead to java.nio calls to read the byte buffers, leading to objects of type org.apache.harmony.luni.platform.PlatformAddress being created.
These buffers are the same as in the example OpenGL code. I am creating a ByteBuffer using allocateDirect() and then creating an IntBuffer using ByteBuffer.asIntBuffer() to pass data to the OpenGL functions. The problem occurs as the system is reading the buffers.
Is there a way around this? Maybe using something other than direct byte buffers? It seems that using this method, OpenGL code of any complexity (ie a lot of OpenGL system calls in every frame) is doomed to pause a lot. I am aware that these calls should be kept to a minimum, but I still need to use a certain amount of them.
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Oct 9, 2009
When an overlay is put on a MapView, the shadow suggest that its at an angle and not flat on the map.
I have been creating scaled bitmaps to overlay on a mapview, but i am either geting the scale wrong or the overlay is being painted at a slight angle, sitting up a bit, rather then being flat to the map.
Does anyone know if this is true? and if so, is there a way to stop it painting at an angle or do you know the angle so i can compensate for it when creating the bitmapped overlay?
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