SampleItemizedOverlay.java

package org.osmdroid.samplefragments.models;

import org.osmdroid.R;
import org.osmdroid.api.IMapView;
import org.osmdroid.util.GeoPoint;
import org.osmdroid.views.MapView;
import org.osmdroid.views.overlay.ItemizedOverlay;
import org.osmdroid.views.overlay.OverlayItem;
import org.osmdroid.views.overlay.OverlayItem.HotspotPlace;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Point;
import android.graphics.drawable.Drawable;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.TextView;

public class SampleItemizedOverlay extends ItemizedOverlay<SampleOverlayItem> implements
		ItemizedOverlay.OnFocusChangeListener {

	private boolean mFocusChanged = false;
	private View mPopupView = null;
	private Context mContext=null;

	public SampleItemizedOverlay(Drawable pDefaultMarker, Context pContext) {
		super(pDefaultMarker);
		populate();
		setOnFocusChangeListener(this);
		mContext=pContext;
	}

	@Override
	protected SampleOverlayItem createItem(int i) {
		SampleOverlayItem item;
		if (i == 0)
			item = new SampleOverlayItem("CentralPark", "Central Park",
					"Central Park in New York City", new GeoPoint(40.7820, -73.9660), null,
					HotspotPlace.BOTTOM_CENTER);
		else
			item = new SampleOverlayItem("NorthCentralPark", "North Central Park",
					"North of Central Park in New York City", new GeoPoint(41.7820, -73.9660),
					mContext.getResources().getDrawable(R.drawable.person), HotspotPlace.CENTER);
		return item;
	}

	@Override
	public void onFocusChanged(ItemizedOverlay<?> overlay, OverlayItem newFocus) {
		mFocusChanged = true;
	}

	@Override
	protected boolean onTap(int index) {
		setFocus(getItem(index));
		return true;
	}


	@Override
	public void draw(Canvas c, MapView mapView, boolean shadow) {
		if (mFocusChanged) {
			mFocusChanged = false;

			// Remove any current focus
			if (mPopupView != null)
				mapView.removeView(mPopupView);

			SampleOverlayItem item = this.getFocus();
			if (item != null) {
				mPopupView = getPopupView(mapView.getContext(), item);
				MapView.LayoutParams lp = new MapView.LayoutParams(LayoutParams.WRAP_CONTENT,
						LayoutParams.WRAP_CONTENT, item.getPoint(),
						MapView.LayoutParams.TOP_CENTER, 0, 0);
				mapView.addView(mPopupView, lp);
			}
		}
		super.draw(c, mapView, shadow);
	}

	protected View getPopupView(Context context, SampleOverlayItem item) {
		TextView tv = new TextView(context);
		tv.setText(item.getTitle());
		tv.setBackgroundColor(Color.BLACK);
		return tv;
	}

	@Override
	protected void onDrawItem(Canvas canvas, SampleOverlayItem item, Point curScreenCoords,
			final float aMapOrientation) {
		super.onDrawItem(canvas, item, curScreenCoords, aMapOrientation);
	}

	@Override
	public int size() {
		return 2;
	}

	@Override
	public boolean onSnapToItem(int arg0, int arg1, Point arg2, IMapView arg3) {
		return false;
	}
}