Android : Reading From XML / Need To Create Overlay Markers On Map

Jun 27, 2010

On my app I will be reading in from an XML file thats formatted something like this

<database> <db1>
<db> <name>name here</name> <street>street here</street> <long> longitude here</long> <lat> latitude here </lat> </db>
<db> <name> new name here </name> <street> new street here </street> <long> new longitude here </long> <lat> new latitude here </latitude> </db>
</db1> </database>

With this information I need to create Overlay Markers on the map (using latitude and longitude) and when they're clicked on I need it to display the name with the address. Depending on the conditions of where the map is, the number of markers will be different so I need a dynamic model for reading in these markers.

If I were to use Document methods like getElementById(String name) then I couldn't call getElementById("name") because it would likely try to call just the first <name></name> or give an unintended result.

Android : Reading from XML / need to create Overlay Markers on map

Android :: Auto Zoom To Fit Markers On An Overlay?

Jun 2, 2010

I have done my fair share of google searches for this and have come up empty.

I have a set of marker(25) that are being displayed on a MapView. I would love to be able to have it zoom to a reasonable level to make the markers readable.

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Android :: Create A Modal Progress Wheel Overlay

Mar 9, 2010

I would like to show a modal progress "wheel" overlay on my view.

The ProgressDialog comes closs, but i do not want the dialog background or border.

I tried setting the background drawable of the dialog window:


But to no avail (i.e. still looks the same as without the ...setBackgroundDrawable code).

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Create App That Draws A Map Reading Data From Text File?

Oct 12, 2011

I have to create an app that draws a map reading data from a text file : for example the text file can be like

. index x y orientation
vertex 1 0 0 0
vertex 2 5 0 0.5
vertex 3 10 2 0.3

so i need to do in java something like fscanf does in c (fscanf scans the text file for known formatted data... example, in the file i written i know each line has a string float float float and i need to put them into a specific data structure that can be a list of elements "vertex"

next, when i have all the data, draw a simple image rappresenting the data..

my questions are...

there is a function like fscanf?

and then.. what's better for drawing the 2d map? i have tu use Opengl? At the end i have to draw the image pixel by pixel.. i hope there is something easier then openGL

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Android :: Map Open Overlay When Pin Is Clicked - Overlay Contains Description / Button

Aug 18, 2010

I like tu use the MapActivity to display some pins. When a pin is pressed i like to open a description. This can I obtain following the tutorial: /resources /tutorials/views/hello-mapview. But now I like to put a button on the overlay window. That button should open a detail activity. How can I make this? How is possible to personalize the overlay "info window"?

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Android :: Add Markers On Map?

Jan 18, 2010

I wanted to know how to add marker on a map? right now, i am trying to build an application that shows the persons current location, and i can follow it. but the problem is i don't have a pointer, so the changing is vague. what i want is to show the persons location with a marker(e.g some kind of bubble) and follow it.=

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Android :: Show Different Markers On A Map?

Nov 15, 2010

I am displaying markers on a map. I am not sure how I can specify a different drawable resource for different markers?

I would like to show a green pin if locations distance < 50, etc. etc.code...

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Android :: Remove Shadow On Markers On My Map?

Nov 17, 2010

I am displaying a custom marker on my Google Map. They are placed fine, but they have this funny shadow. How can I remove the shadow? code...

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Android :: Add Markers To A Google Map On Droid?

Aug 4, 2010

I've got a place I want to add on my map at a particular lat / lng. I'd like to display that on my map when the activity starts. How would I do this?

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Android : How To Draw Dynamic Markers On A Map?

Jul 26, 2010

How would dynamically draw markers on a Mapview? I've got the following code which will hardcode one point in. I'm looking to pull values from a database..

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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


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 :: Move Markers With Maps API To A New Position?

Sep 21, 2009

I'm wondering if it is possible to move markers when using a MapView. I use a fullscreen MapView which has a few (not more than 5) markers which I would like to move and update by just moving the markers to a new position.

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Android :: OverlayItem Not Displaying Markers / What To Show It?

Jul 5, 2010

I have the following code and the markers are not appearing on the map at all! code...

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Android :: Scale Map Markers By Zoom Factor?

Aug 19, 2010

I have lot of markers on my map. Zooming in each marker shows me a position. but zooming out the markers are overlapping each other and it is more difficult do determine the position of a marker.

Is there a way to scale the marker image depending on the zoom factor?

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Android :: Load Only Markers That Would Be Displayed On Current Screen?

Aug 5, 2010

Using Google Maps on Android does anyone have any ideas on how to load only markers that would be displayed on the current screen? I'm thinking about sending a request to a web service that returns the lat/lng for the relevant markers. But what would the parameters be that I could use to calculate if a given lat/lng is within the screen?

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Android :: How To Scale Markers And Set Shadow And OnTap Correctly

Nov 17, 2009

I'm scaling markers on a MapView with the following code




Which works, but the shadow below the marker has wrong offset when scaled. Also; i override the public boolean onTap(int index) in ItemizedOverlay to detect taps on the markers, but it seems inaccurate. I can click some range outside the marker and still trigger onTap...

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Android :: Limit For Numebr Of Markers To Show On A MapView?

Nov 3, 2010

As the object of this topic. is there a limit for the numebr of markers to show on a MapView at the same time with the Google API?

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Android : How To Compute Zoom Level Against Returned Markers?

Aug 5, 2009

I'd like to know if there is already a way to know from a given set of markers, the zoom I should apply to the map or do I have to do it my self? (this depends on the resolution so i expected to find it in MapView because it knows its boundaries.

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Drawing Lots Of Markers On A Map

Oct 28, 2011

I'm trying to draw on a map using markers. The problem I'm having is when I try to add lots of them, then I can't get it to run. To illustrate my problem, let's say I want to draw a square made of 900 smaller squares (30x30).I'm trying to add the markers to an itemizedoverlay, then drawing it.

public class MyItemizedOverlay extends ItemizedOverlay{
private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();
private Context mContext;

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Android :: Load Markers Dynamically For Current Position In Android Google Maps?

Aug 5, 2010

I'm currently developing an app for Android which uses google map service. Because users will be able to see thousands of markers I would like to load only those which are currently within the map bounds (i.e. when user look at specific map tile). I know how to do it with javascript/html. However, Android doesn't seem to provide any similar methods such as containsLatLng(latlng) or getBounds (I only found getLatitudeSpan and getLongitudeSpan, but don't know how can I use them in order to achieve the similar effect). Can anyone give me some hint on that?

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General :: Video Player - Track Seekbar Scrub Past Markers?

May 11, 2012

I am currently working on a video player using the VideoView and I am controlling it with the MediaController.

The first thing I would like to do is to be able to place markers along the seekbar, such as 25% of the clip. I want to fire an event when this mark is hit or scrubbed past. Throwing an event when this marker is hit with the video playing regularly will be easy because I should be able to just use getCurrentPosition and checking to see if it is 25% of the total clip. The issue I am having is how to fire the event if the user scrubs past the 25% point.

The second thing I am trying to do is just show a visual marker along the seekbar that I can display a marker, lets say at the 25% point, 50% point, etc.

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Android :: Custom Map Markers And Custom Backgrounds

Mar 1, 2010

I am trying to get the images to have transparent backgrounds so the map is not blocked by a square marker with an image in it. What image editor and what settings should I use to get this to work?

I am trying to do some custom backgrounds for buttons and the same problem comes up: I get square corners and a background that does not scale with the buttons.

I think this all part of the same problem: I am not using the right tool with the right settings to create the images. I must be misinterpreting the documentation and examples that talk about a white border around the image and a black line along the top and left side for the expandable button background.

Here's a quick way to reproduce the problem:

Follow the directions to create the MapView program as described on:

For the icon I first used the image copied from the page:

Next I edited the picture in Microsoft Paint, and cut off the little guy's antennae. I'm not cruel and no real androids were harmed in that experiment. I surrounded the new picture with a pixel thick border of white, copied from the border that was around the rest of the image, and then copied the black that was there as well in the void areas of the image, outside the border.

I saved the image as myandroid.png and copied the file to the layout folder. Pointed the activity to the new pic and ran the program.

The image was displayed with a full square background and shadow, not the android shaped image and shadow that was there when the original image was used.

Custom Button background:
Follow the directions for the Relative Layout example at:

Next, I created an image to expand as a background for the button called backbutton.png. It too is surrounded by a white border and black filled on the corners, the top and one side per documentation I found in "Android Programming Tutorials" on page 298.

The background does not expand, nor do the corners round.

I wish I could show you screenies of what I have.

How do you create the images for the custom backgrounds and the images for the custom map markers and buttons? I need to know what image editor to use and the file attributes to set, so the images expand and display with the proper void spaces in them.

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Android :: How To Market Map Overlay?

Sep 21, 2010

I want to market an overlay for Android Maps. It will provide the "speed limit". My map will have to query the internet for updates pretty heavily as one travels. Q: Should I just use the "Maps external Library" thing? or Q: Can I somehow make it an option in the normal google-map system that everyone has on their phone?

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Android :: Animated Map Overlay

Feb 17, 2009

I am trying to make a map overlay animated much like MyLocationOverlay does. Currently the only things that I can see to make animated are Views but Overlays don't extend View functionality. My next thought was to try to lodge a View into the overlay, but the redundancy makes it seem like this solution is incorrect. I grabbed the android source hoping that I could just look at MyLocationOverlay source and that would let me know how the animation was supposed to be done, but I can't find the source for anything involving maps. If that is available somewhere it would help. Can someone point me to the MyLocationOverlay source or let me know what the paradigm is supposed to look like for animating map overlays?

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Android :: Activity As Overlay Over Other App

Sep 23, 2009

Is it possible to create an Android activity as an overlay above other application? If yes, please provide me a pointer.

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Android :: Add Overlay To MapView?

Sep 28, 2010

I have subclassed Overlay as LandMarkOverlay (and implemented an onTap(GeoPoint) method).

In the main activity I do this:


MapView mapView = (MapView) findViewById(;
landmarkOverlay = new LandmarkOverlay();

//add the landmarkOverlay to the list

What else do I need to do so that when the user taps the screen, landmarkOverlay's onTap(GeoPoint) method gets called?

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Android :: Overlay Vs ItemizedOverlay?

Oct 24, 2009

I want to draw 20 pins on a MapActivity. Each pin has a small pin image, but I have to dynamically overlay a small bit of text over each pin at runtime.

Looks like I have two options:

#1) Itemized Overlay This is the suggested method. I put all my pins in one ItemizedOverlay object, and that counts as a single Overlay object for my MapView.

#2) One Overlay per pin Create a separate Overlay instance for each pin I need to render.

The problem I see with using method #1 is that you need to set a drawable for the item. This would mean that I need to create 20+20 (one for focused/non-focused state each) bitmaps and keep them in memory for the duration of my app. On the other hand, Overlay lets you override the draw method so I can do the simple compositing at runtime.

The other issue with Itemized Overlay - although it handles focus for you - does it move the focused item to the front of the z-order when selected?

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Android :: Memory Leak In Map Overlay

Jan 10, 2010

I have been banging away at this one for weeks and I feel like I have exhausted my research capabilities. I am hoping that someone will see my error in the code posted below. The code is completely functional doing everything I need, but there is a major memory leak. When I try to track memory in the DDMS, the VM Heap tells me that my object count is relatively stable and the used memory is also relatively stable (it comes back down to a similar value after each GC after panning).

When I look at the memory pie chart, the free memory loses over 1meg of capacity with each map pan (overlay reload) and the Unknown memory grows. I have not found anything with the allocation tracker. Functional Summary: I load overlays onto a map based on data I get from polling my server. When I pan the map far enough I clear the overlays and load new ones. (snippets): //header info private List<Overlay> overlays;
//in onCreate overlays = mapView.getOverlays();
// here I attempt to fully clean up my old Overlays for (Overlay i : overlays) {
if (i instanceof ParcelOverlay) ((ParcelOverlay) i).cleanUp(); }

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Android :: Draw Bitmap On Overlay

Nov 12, 2009

I've been trying almost everything and been searching and reading everywhere on the net. I just can't seem to find the correct way of doing this.

I have a MapActivity with a MapView and I want to draw something on an Overlay. I'm overwriting the draw-method, and I can easily draw straight on the canvas using a paint. My problem is I want to merge some circles and afterwards color them. Therefore I want to create a Bitmap and then draw on that. I just don't know what to use. Should I use a mutable Bitmap, a BitmapDrawable or am I simply going in the wrong direction.

The reason I want to do this is because I want to draw some kind of heatmap upon the Google Maps, and I need to merge and blend different circles, so they appear to be just one big blob.

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Android :: Overlay Image On Imageview

Oct 13, 2010

How to overlay two images like the one in iphone notification icon or new launcher pro notification? I want to add new image on top right of an imageview to show notification.

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