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    <p>The best way to animate items on the MapView is not using Views, but animating the overlay.</p> <p>Here's a class I made to handle animating map markers to replicate the behaviour of the nice effect you get on the iPhone. In this case I was adding markers to indicate businesses so where it says 'Business' it is just referring to a marker. This code hasn't been tested on many devices. I know there can be some issues with the projection class which might cause issues so don't take this code as stable and treat accordingly.</p> <pre><code>import java.util.ArrayList; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.Point; import android.os.AsyncTask; import android.widget.AdapterView.OnItemClickListener; import com.google.android.maps.GeoPoint; import com.google.android.maps.MapView; import com.google.android.maps.Overlay; import com.google.android.maps.Projection; public class MarkerOverlay extends Overlay { private ArrayList&lt;Business&gt; mOverlays = new ArrayList&lt;Business&gt;(); private Bitmap mBitmapMarker; private Bitmap mBitmapShadow; DropMarkersTask animateMarkers; OnItemClickListener itemClickedListener; public MarkerOverlay(Bitmap defaultMarker) { mBitmapMarker = defaultMarker; // Create shadow bitmap. Basically a black version of the image mBitmapShadow = defaultMarker.copy(Bitmap.Config.ARGB_8888, true); for(int x = 0;x &lt; mBitmapShadow.getWidth();x++) for(int y = 0;y &lt; mBitmapShadow.getHeight();y++) if(mBitmapShadow.getPixel(x, y) != Color.TRANSPARENT) // This is a little lazy but it works mBitmapShadow.setPixel(x, y, Color.BLACK); } public void setOnItemClickListener(OnItemClickListener clickListener) { this.itemClickedListener = clickListener; } public void addBusiness(Business overlay) { for(Business business : mOverlays) { if(overlay.getPoint().getLatitudeE6() == business.getPoint().getLatitudeE6() &amp;&amp; overlay.getPoint().getLongitudeE6() == overlay.getPoint().getLongitudeE6()) { // Don't add any markers which exist at exactly the same location, chances are it's the same marker return; } else if (overlay.getPoint().getLatitudeE6() &gt; business.getPoint().getLatitudeE6()) { // This is so all the markers are listed top to bottom mOverlays.add(mOverlays.indexOf(business), overlay); return; } } mOverlays.add(overlay); } public Business getItem(int position) { return mOverlays.get(position); } @Override public void draw(Canvas canvas, MapView mapView, boolean shadow) { super.draw(canvas, mapView, shadow); Projection projection = mapView.getProjection(); boolean animationRequired = false; // Find the bounds in which the markers must reside to be displayed GeoPoint bottomLeft = projection.fromPixels(- mBitmapMarker.getWidth() / 2, mapView.getHeight() + mBitmapMarker.getHeight()); GeoPoint topRight = projection.fromPixels(mapView.getWidth() + mBitmapMarker.getWidth() / 2, 0); for(Business business : mOverlays) { // Check to ensure the marker is inside the bounds if(business.getPoint().getLatitudeE6() &gt; bottomLeft.getLatitudeE6() &amp;&amp; business.getPoint().getLatitudeE6() &lt; topRight.getLatitudeE6() &amp;&amp; business.getPoint().getLongitudeE6() &gt; bottomLeft.getLongitudeE6() &amp;&amp; business.getPoint().getLongitudeE6() &lt; topRight.getLongitudeE6()) { if(business.isNewPoint()) { business.setOffset(mapView.getHeight()); business.setOldPoint(); } Point pt = new Point(); projection.toPixels(business.getPoint() ,pt); if(shadow) { // Set the location of the shadow according to the offset so it appears to come in from the top right pt.x = pt.x + (mBitmapMarker.getWidth() / 4) + ((int)business.getOffset() / 2); pt.y = pt.y - (mBitmapMarker.getHeight() / 2) - ((int)business.getOffset() / 2); // Skew the shadow and set the location Matrix matrix = new Matrix(); matrix.preSkew(-0.8f, 0f); matrix.preScale(1f, 0.5f); matrix.postTranslate(pt.x, pt.y); // Change transparency according to the offset Paint paint = new Paint(); paint.setAlpha((int)(((mapView.getHeight() - business.getOffset()) / mapView.getHeight()) * 100)); // Draw it canvas.drawBitmap(mBitmapShadow, matrix, paint); } else { // Set the position according to the offset pt.x = pt.x - (mBitmapMarker.getWidth() / 2); pt.y = pt.y - mBitmapMarker.getHeight() - (int)business.getOffset(); canvas.drawBitmap(mBitmapMarker, (float)pt.x, (float)pt.y, null); if(business.getOffset() &gt; 0) { animationRequired = true; } } } } // Start the animation task if it hasn't already been started if(animationRequired &amp;&amp; (animateMarkers == null || animateMarkers.getStatus() != AsyncTask.Status.RUNNING)) { animateMarkers = new DropMarkersTask(); animateMarkers.execute(mapView); } } @Override public boolean onTap(GeoPoint point, MapView map) { if(itemClickedListener == null) { return false; } Projection projection = map.getProjection(); int imageWidth = mBitmapMarker.getWidth(); int imageHeight = mBitmapMarker.getHeight(); // Find the point on the screen which has been clicked Point clickPoint = new Point(); projection.toPixels(point, clickPoint); // Go backwards through the businesses and find out if the location falls within their marker for(int i = mOverlays.size() - 1; i &gt;= 0; i--) { Business business = mOverlays.get(i); Point businessPoint = new Point(); projection.toPixels(business.getPoint(), businessPoint); if(businessPoint.x &gt; 0 &amp;&amp; businessPoint.x &lt; map.getWidth() &amp;&amp; businessPoint.y &gt; 0 &amp;&amp; businessPoint.y &lt; map.getHeight()) { // Point is visible, so may clicked int left = businessPoint.x - (imageWidth / 2); int right = businessPoint.x + (imageWidth / 2); int top = businessPoint.y - imageHeight; int bottom = businessPoint.y; if(clickPoint.x &gt;= left &amp;&amp; clickPoint.x &lt;= right &amp;&amp; clickPoint.y &gt;= top &amp;&amp; clickPoint.y &lt;= bottom) { // Item has been clicked // Adapter will be null as this isn't one. We will return the map // in the view for consistency but most importantly the index of the item itemClickedListener.onItemClick(null, map, i, 0); return true; } } } return false; } class DropMarkersTask extends AsyncTask&lt;MapView, Void, Void&gt; { MapView mapView; @Override protected Void doInBackground(MapView... mapViews) { mapView = mapViews[0]; boolean mapUpdate = true; try { while(mapUpdate) { Projection projection = mapView.getProjection(); GeoPoint bottomLeft = projection.fromPixels(- mBitmapMarker.getWidth() / 2, mapView.getHeight() + mBitmapMarker.getHeight()); GeoPoint topRight = projection.fromPixels(mapView.getWidth() + mBitmapMarker.getWidth() / 2, 0); mapUpdate = false; // Any visible markers with an offset higher than zero must be falling and therefore must be moved. for(Business business : mOverlays) { if(business.getPoint().getLatitudeE6() &gt; bottomLeft.getLatitudeE6() &amp;&amp; business.getPoint().getLatitudeE6() &lt; topRight.getLatitudeE6() &amp;&amp; business.getPoint().getLongitudeE6() &gt; bottomLeft.getLongitudeE6() &amp;&amp; business.getPoint().getLongitudeE6() &lt; topRight.getLongitudeE6()) { if(business.getOffset() &gt; 0) { // A nice Quadratic fall curve. double currentY = Math.sqrt(mapView.getHeight() - business.getOffset()); currentY = currentY + 0.5; double dropDistance = Math.pow(currentY, 2); double newOffset = mapView.getHeight() - dropDistance; if(newOffset &lt; 0) { // Marker can't have an offset less than zero newOffset = 0; } business.setOffset(newOffset); mapUpdate = true; } } } if(mapUpdate) { this.publishProgress(); Thread.sleep(20); } } } catch (InterruptedException e) { e.printStackTrace(); } return null; } @Override protected void onProgressUpdate(Void... unused) { mapView.postInvalidate(); } } } </code></pre> <p>Setting up the overlay (most likely in your onCreate method):</p> <pre><code> mapBusinesses = (EventMapView)findViewById(R.id.mapBusinesses); mapOverlays = mapBusinesses.getOverlays(); Bitmap drawable = BitmapFactory.decodeResource(this.getResources(), R.drawable.map_pin); businessMarkerOverlay = new MarkerOverlay(drawable); businessMarkerOverlay.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView&lt;?&gt; adapter, View view, int position, long id) { Business business = businessMarkerOverlay.getItem(position); AlertDialog.Builder dialog = new AlertDialog.Builder(MainActivity.class); dialog.setTitle(business.getBusiness()); dialog.show(); } }); mapOverlays.add(businessMarkerOverlay); </code></pre> <p>Adding a new marker: Don't forget to call postInvalidate on the map to kick off the first draw when the map it otherwise idle.</p> <pre><code>businessMarkerOverlay.addBusiness(business); mapBusinesses.postInvalidate(); </code></pre> <p>Lastly, this is the class I used for the Business object:</p> <pre><code>public class Business { private String _business; private int _businessId; private GeoPoint _point; private boolean _newPoint; private double _offset; public Business(GeoPoint point, String business, int businessId) { _point = point; _business = business; _businessId = businessId; _newPoint = true; } public int getBusinessId() { return _businessId; } public String getBusiness() { return _business; } public GeoPoint getPoint() { return _point; } public boolean isNewPoint() { return _newPoint; } public double getOffset() { return _offset; } public void setOldPoint() { _newPoint = false; } public void setOffset(double offset) { _offset = offset; } } </code></pre>
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    1. POHow to implement Drop pin animation in android using google maps?
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    1. USScott
    1. USScott
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      1. VTUpMod
    1. COYou should use pixels to check bounds. Not Lat/Long. See my answer.
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      1. USTomasz Rybakiewicz
 

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