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    <p>In your code the draw() methhod is called only once and then it is never recalled. The populate method will repopulate all the overlayes points which is there in your list each time. So it will again call the draw method which will draw a line for you.</p> <pre><code>package com.example.mymap; import java.util.ArrayList; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.Point; import android.graphics.drawable.Drawable; import com.google.android.maps.GeoPoint; import com.google.android.maps.ItemizedOverlay; import com.google.android.maps.MapView; import com.google.android.maps.OverlayItem; public class ItemOverLay extends ItemizedOverlay&lt;OverlayItem&gt; { private ArrayList&lt;OverlayItem&gt; mOverlays = new ArrayList&lt;OverlayItem&gt;(); GeoPoint prePoint=null,currentPoint=null; MapView mapView=null; Paint paint=new Paint(); public ItemOverLay(GeoPoint prePoint,GeoPoint currentPoint, Drawable defaultMarker,MapView mapview) { super(boundCenterBottom(defaultMarker)); this.currentPoint=currentPoint; this.prePoint = prePoint; mapView=mapview; // TODO Auto-generated constructor stub } public ItemOverLay(Drawable defaultMarker) { super(defaultMarker); // TODO Auto-generated constructor stub } public void addOverlay(OverlayItem item){ mOverlays.add(item); populate(); } @Override protected OverlayItem createItem(int i) { // TODO Auto-generated method stub return mOverlays.get(i); } @Override public void draw(Canvas canvas, MapView mapView, boolean shadow) { super.draw(canvas, mapView, shadow); Paint paint=new Paint(); Point screenCoords=new Point(); Point screenCoords1=new Point(); mapView.getProjection().toPixels(prePoint, screenCoords); int x1=screenCoords.x; int y1=screenCoords.y; mapView.getProjection().toPixels(currentPoint, screenCoords1); int x2=screenCoords1.x; int y2=screenCoords1.y; paint.setStrokeWidth(1); canvas.drawLine(x1, y1, x2, y2, paint); } @Override public int size() { // TODO Auto-generated method stub return mOverlays.size(); } </code></pre> <p>}</p>
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    1. POOverlay only draws line between first 2 GPS points in Android
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    1. USRahul Patel
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    1. COThanks for the reply Rahul, I have added the populate(); method to the addPoint method, but that did not seem to work. It still does not draw a line between the third point and the last.
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      1. USjcrowson
    2. CORahul, thanks again for the updated code, it is extremely helpful!. One thing I do not understand is the line: mapView.getProjection().toPixels(prePoint, screenCoords); As prePoint and screenCoords are null, so I am receiving a nullpointerexception. Would I need to add or change any code in my MapView class? I can provide the code. Thankyou.
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    3. COplease show me your code, will let you know what mistakes is there else will send you the sample code for that. which will show you how to draw the lines.
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