Android :: MapView Draw Overlays

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?

Android :: MapView draw Overlays


Android :: MapView Overlays

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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Android :: Dynamic Pin Overlays In MapView

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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Android :: MapView Overlays With Multitouch

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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Android :: Overlays On A Mapview Not Shown

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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Android :: MapView Animated Overlays?

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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Android :: Do MapView Overlays Get Painted At Angle

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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Android :: MapView Overlays Containing Widgets/View

Dec 30, 2009

I've been searching for this for quite a while and never come across a way to do it. In the Google Maps App, when you search for directions, there are overlays with buttons in them, and I want a similar thing, a marker with an image, text and button inside.

I've implement ItemizedOverlays before and made the marker clickable which I would event be happy with if I could put a linear layout inside the marker to organise the image and text since they are different for each marker.

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Android :: Creating MapView With ContextMenu Without Overlays

Oct 27, 2010

I have a mapview and i wish to display a ContextMenu when longclick but so far the closest solution i've found is here on anddev , the main reason i do not like that method is because any click activate the ContextMenu instead of a long click.

Question: Is there a way to display the ContextMenu of a Map without using Overlays? Why?

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Android :: Workaround For Mapview Overlays Not Pinch-zooming Correctly

Oct 26, 2010

If a user does a "pinch zoom" on the map, my overlays don't properly size until the end. This has been noted in other posts, so i assume it is a known issue.

Problem is, my client finds it totally unacceptable, as I am tasked with making the android app look as good as the iphone version.

Is there any way to correct this, even if it is a horrible hack? For instance, can I subclass the mapview and handle drawing or override some other method?

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Android :: Overlays Not Working In Google MapView Tutorial Android

Feb 16, 2010

Got some errors following the tutorial for MapView when i was going to integrate overlays.

CODE:..............

I am trying to learn and i got an awesome app idea which needs mapview, webview, overlays and tabs.

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Android :: How To Draw 3D Objects On A MapView?

Oct 20, 2009

I have been able to draw a map using 'MapActivity' class. Am unable to render 3D graphics on the Map. Is there any way to draw something on the foreground with the Map as the background?

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Android :: Draw Text With Border On MapView?

Nov 12, 2009

I'm trying to draw some text onto an MapView on Android. The drawing of the text goes fine, but it's very hard to read the text because it's white with no black border (like the rest of the text that appears naturally on MapViews to denote cities, states, and countries). I can't seem to figure how to draw the text with a black border. This is the sort of code I'm using right now (this is just example code, found in one of my overlays):

@Override
public void draw(Canvas canvas, MapView mapView, boolean shadow) {
Paint textPaint = new Paint();
textPaint.setARGB(255, 255, 255, 255);
textPaint.setTextAlign(Paint.Align.CENTER);
textPaint.setTextSize(16);
textPaint.setTypeface(Typeface.DEFAULT_BOLD);
canvas.drawText("Some Text", 100, 100, textPaint);
super.draw(canvas, mapView, shadow);}

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Android :: Problem Draw On A MapView ItemizedOverlay

Aug 27, 2010

I am developing an application for the Parisian Metro. One of the functions is a map where you can click the metro stations and see what are the metro lines, and when are the next 4 trains on this station.

I have hence created a MapActivity and an ItemizedOverlay classes.

On my device it is working perfectly, but I am getting some logs from the users with a crash, and I really don't understand what's wrong.

My map activity adds ONE ItemizedOverlay that displays a blue dot for the current user location. This overlay also listens to onTap, which depending on the coordinates of the tap, will try to find metro stations (for which I know the lat/lon coordinates). This is working perfectly.

The stack trace of the crash is:

CODE:.....................

Sometimes it comes from different lines but it always finishes crashing at OverlayBunde.java:42

As is does not mention my code, I don't know what's wrong.

You can get the source code of the MapActivity and the the ItemizedOverlay: http://code.google.com/p/metroparis/source/browse/trunk/src/org/bicou/metro/

The activity class is ACarteStations and the overlay class is StationMetroMapOverlay.

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Android :: Draw ImageView At Specific GeoPoint On MapView

Oct 1, 2010

Trying to solve my current problem of drawing an image on an Android MapView and then animate it to represent a moving object, I decided to try to just draw a raw ImageView at a GeoPoint on the map and then try and animate it from there.

This is the code I put in my map activity (extends MapActivity)'s onCreate method:

CODE:..............

Again, I'm just trying to draw the static icon and animate it from there. I can already do this with an ItemizedOverlay, but as far as I can tell, I can't animate the elements of an AnimatedOverlay the way that I can animate a view. Thus, using ImageView.

But the icon doesn't show up.

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Android :: Draw MapView - Rectangles That Automatically Re-size When User Zooms In And Out

Aug 26, 2010

My Android application has a MapView. I want to divide that MapView into a grid according to latitude and longitude, and shade the different cells of that grid different colors based upon a certain criteria. What's the simplest way to do this?

I could create semi-transparent, solid-color PNG Drawable rectangular images and put them in an ItemizedOverlay centered on the central points of the cells, but then the rectangles would grow and shrink as the user zoomed in and out on the map. I could extend MapView and override the zoom functions so that the rectangles got re-sized when the user zoomed, but that seems really complicated for something that should be simple! Please tell me a better way to do it?

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Android :: Google Maps - MapView - Draw A Nice Flight Route Between 2 Points

Aug 1, 2010

I wonder, how can I draw a nice flight route between 2 points on a google map's MapView? look at this: http://maps.forum.nu/gm_flight_path.html

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Android :: Draw Path On MapView From Large Amount Of Longitude/latitude Points

Aug 2, 2010

I am writing a application that needs to draw a "route" comprised of lots of GPS points (long+lat). The points are close together and don't follow roads, simply drawing a line between each point is ideal.

The current implementation I have is very slow as I am looping over all the GPS coordinates and creating a new Point and overlayitem in an itemized overlay. This takes around 20 seconds for it to load all of these points and draw them to the mapview. Is there a way in which I can construct a series of lines or point from the GPS coordinates and draw them onto the mapview?

Example of current implementation:

CODE:...................

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HTC Desire : Google Maps Earth Overlays - How To Add Overlays

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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Android : Save / Activity With MapView And After Reload Same Mapview?

Jul 16, 2010

I had found a lot of stackoverflow post about save an Activity and the reload it.

My question: How can I have an Activity with an MapView and after reload the same mapview?

What is the best way to switch between activity and views?

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Android :: Draw Route Path Draw Function

Sep 5, 2010

In my android application I use this method in "draw" Overlay class for draw route on map. Can someone tell me if this method is good (in terms of performance) for route draw on map or I must to put code in Thread ??
I'm new to android.

public synchronized void draw(Canvas canvas, MapView mapView, boolean shadow) {
if (pointsAndTimes.isEmpty()) {
return;
}
Projection projection = mapView.getProjection();
Paint paint = new Paint();
paint.setARGB(250, 255, 0, 0);.............

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Android :: Overlays Drawn On The Map

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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Android :: More Efficient Map Overlays

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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Android :: Possible To Remove All Overlays?

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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Android :: Efficient Map Overlays In On Google Map

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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Android :: Map Performance Poor Because Of Many Overlays?

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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Android :: ImageView Clickable Overlays

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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Android :: FrameLayout For Drawing Overlays In Game?

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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Android :: Clear All Map Overlays Or Markers From Google Map?

Mar 31, 2010

I want to clear all map overlays or markers from google map and using following code

if(!mapOverlays.isEmpty())
{
mapOverlays.clear();
}

which is giving me exception can any one guide me? am i right or wrong if i am wrong then kindly provide me the solution to my problem. i want map clean if there is any marker on it.

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Android :: Navigation Overlays For Tracks Are Implemented?

Oct 21, 2010

Can somebody point me to the right direction how the navigation overlays for My Tracks are implemented? I'm talking about the "buttons" for navigating appearing on the left and right side if you tap on the screen. Any pointers?

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