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    <p>You need to extend this <a href="http://code.google.com/android/add-ons/google-apis/reference/com/google/android/maps/ItemizedOverlay.html" rel="nofollow">http://code.google.com/android/add-ons/google-apis/reference/com/google/android/maps/ItemizedOverlay.html</a>.</p> <pre><code>public class CustomOverlay extends ItemizedOverlay&lt;OverlayItem&gt; { private Context context; private ArrayList&lt;OverlayItem&gt; mOverlays = new ArrayList&lt;OverlayItem&gt;(); public CustomOverlay(Drawable defaultMarker, Context context) { super(boundCenterBottom(defaultMarker)); this.context = context; //after adding things to the overlay, call these: setLastFocusedIndex(-1); populate(); } @Override protected boolean onTap(int index) { //called when an item is tapped return true; } @Override public boolean onTap (final GeoPoint p, final MapView mapV) { boolean tapped = super.onTap(p, mapV); if(!tapped){ //you can use this to check for other taps on the custom elements you are drawing } return true; } @Override public void draw(Canvas canvas, MapView mapV, boolean shadow){ if(!shadow) // if you have a custom image you may not want the shadow to be drawn super.draw(canvas,mapV,shadow); if(selected != null) { // selected just means that something was clicked // it isn't defined in this example Projection projection = mapV.getProjection(); Point drawPoint = projection.toPixels(selected.getPoint(), null); //get coordinates so you can do your drawing code afterward } } @Override protected OverlayItem createItem(int i) { return mOverlays.get(i); } @Override public int size() { return mOverlays.size(); } } </code></pre> <p>This is a very rough sketch of what you need to do. Hope this helps.</p>
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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