.net barcode reader component download The OverlayItem subclass BuoyOverlayItem in Java

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Listing 11.8 The OverlayItem subclass BuoyOverlayItem
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public class BuoyOverlayItem extends OverlayItem { public final GeoPoint point; public final BuoyData buoyData; public BuoyOverlayItem(GeoPoint point, BuoyData buoyData) { super(point, buoyData.title, buoyData.dateString); this.point = point; this.buoyData = buoyData; } }
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You extend OverlayItem to include all the necessary properties of an item to draw on the map. In the constructor you call the superclass constructor with the location, title, and a brief snippet, and you assign additional elements your subclass instance variables. In this case you add a BuoyData member, which is another bean with name, water temperature, wave height, and other properties.
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Location, location, location
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After you prepare the individual item class, you need a class that extends
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ItemizedOverlay and uses a Collection of the items to display them on the map one by one. The following listing, the BuoyItemizedOverlay class, shows how this works.
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Listing 11.9 The BuoyItemizedOverlay class
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Extend public class BuoyItemizedOverlay ItemizedOverlay extends ItemizedOverlay<BuoyOverlayItem> { private final List<BuoyOverlayItem> items; Include private final Context context; Collection of public BuoyItemizedOverlay(List<BuoyOverlayItem> items, OverlayItem Drawable defaultMarker, Context context) { super(defaultMarker); Provide this.items = items; drawable this.context = context; marker this.populate(); } @Override public BuoyOverlayItem createItem(int i) { Override return items.get(i); createItem } @Override Get data to protected boolean onTap(int i) { display final BuoyData bd = items.get(i).buoyData; LayoutInflater inflater = LayoutInflater.from(context); View bView = inflater.inflate(R.layout.buoy_selected, null); TextView title = (TextView) bView.findViewById(R.id.buoy_title); . . . rest of view inflation omitted for brevity new AlertDialog.Builder(context) .setView(bView) .setPositiveButton("More Detail", new DialogInterface.OnClickListener() { public void onClick(DialogInterface di, int what) { Intent intent = new Intent(context, BuoyDetailActivity.class); BuoyDetailActivity.buoyData = bd; context.startActivity(intent); } }) .setNegativeButton("Cancel", new DialogInterface.OnClickListener() { public void onClick(DialogInterface di, int what) { di.dismiss(); } }) .show(); return true; } @Override public int size() { Override return items.size(); size method } @Override public void draw(Canvas canvas, MapView mapView, boolean b) {
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Working with maps
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super.draw(canvas, mapView, false); } }
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287 Customized drawing
The BuoyItemizedOverlay class extends ItemizedOverlay B and includes a Collection of BuoyOverlayItem elements C. In the constructor you pass the Drawable marker to the parent class D. This marker draws on the screen in the overlay to represent each point on the map. ItemizedOverlay takes care of many of the details you d otherwise have to implement yourself if you made your own Overlay with multiple points drawn on it. This includes drawing items, handling focus, and processing basic events. An ItemizedOverlay will invoke the onCreate method E for every element in the Collection of items it holds. ItemizedOverlay also supports facilities such as onTap F, where you can react when the user selects a particular overlay item. In this code you inflate some views and display an AlertDialog with information about the respective buoy when a BuoyOverlayItem is tapped. From the alert, the user can navigate to more detailed information if desired. The size method tells ItemizedOverlay how many elements it needs to process G, and even though you aren t doing anything special with it in this case, there are also methods such as onDraw H that you can customize to draw something beyond the standard pushpin. When working with a MapView, you create the Overlay instances you need, then add them on top of the map. Wind and Waves uses a separate Thread to retrieve the buoy data in the MapViewActivity. You can view the data-retrieval code in the code download for this chapter. After downloading the buoy data, you send a Message to a Handler that adds the BuoyItemizedOverlay to the MapView. The following listing shows these details.
Listing 11.10 The Handler Wind and Waves uses to add overlays to the MapView
private final Handler handler = new Handler() { public void handleMessage(final Message msg) { progressDialog.dismiss(); if (mapView.getOverlays().contains(buoyOverlay)) { mapView.getOverlays().remove(buoyOverlay); } buoyOverlay = new BuoyItemizedOverlay(buoys, defaultMarker, MapViewActivity.this); mapView.getOverlays().add(buoyOverlay); } };
A MapView contains a Collection of Overlay elements. You use the remove method to clean up any existing BuoyOverlayItem class before you create and add a new one. This way you reset the data instead of adding more items on top of each other.
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