Android™ Application Development - Bahar Ali Khan

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Chapter 7: Maps, Geocoding, and Location-Based Services 240 } } // Create each of the overlay items included in this layer. populate(); @Override protected OverlayItem createItem(int index) { switch (index) { case 1: Double lat = 37.422006*1E6; Double lng = -122.084095*1E6; GeoPoint point = new GeoPoint(lat.intValue(), lng.intValue()); } } OverlayItem oi; oi = new OverlayItem(point, “Marker”, “Marker Text”); return oi; return null; @Override public int size() { // Return the number of markers in the collection return 1; } ItemizedOverlay is a generic class that lets you create extensions based on any OverlayItemderived subclass. Within the implementation, override size to return the number of markers to display and createItem to create a new item based on the index of each marker. You will also need to make a call to populate within the class’s constructor. This call is a requirement and is used to trigger the creation of each OverlayItem; it must be called as soon as you have the data required to create all the items. To add an ItemizedOverlay implementation to your map, create a new instance (passing in the default drawable marker image to use), and add it to the map’s Overlay list, as shown in the following snippet: List overlays = mapView.getOverlays(); MyItemizedOverlay markrs = new MyItemizedOverlay(r.getDrawable(R.drawable.marker)); overlays.add(markrs); Pinning Views to the Map and Map Positions Previously in this chapter, you saw how to add the Zoom View to a Map View by pinning it to a specifi c screen location. You can pin any View-derived object to a Map View (including layouts and other View Groups), attaching it to either a screen position or a geographical map location.
Chapter 7: Maps, Geocoding, and Location-Based Services In the latter case, the View will move to follow its pinned position on the map, effectively acting as an interactive map marker. As a more resource-intensive solution, this is usually reserved for supplying the detail “balloons” often displayed on mashups to provide further detail when a marker is clicked. Both pinning mechanisms are implemented by calling addView on the MapView, usually from the onCreate or onRestore methods within the MapActivity containing it. Pass in the View you want to pin and the layout parameters to use. The MapView.LayoutParams parameters you pass in to addView determine how, and where, the View is added to the map. To add a new View to the map relative to the screen, specify a new MapView.LayoutParams including arguments that set the height and width of the View, the x/y screen coordinates to pin to, and the alignment to use for positioning, as shown below: int y = 10; int x = 10; MapView.LayoutParams screenLP; screenLP = new MapView.LayoutParams(MapView.LayoutParams.WRAP_CONTENT, MapView.LayoutParams.WRAP_CONTENT, x, y, MapView.LayoutParams.TOP_LEFT); EditText editText1 = new EditText(get<strong>Application</strong>Context()); editText1.setText(“Screen Pinned”); mapView.addView(editText1, screenLP); To pin a View relative to a physical map location, pass four parameters when constructing the new MapView LayoutParams, representing the height, width, GeoPoint to pin to, and the layout alignment. Double lat = 37.422134*1E6; Double lng = -122.084069*1E6; GeoPoint geoPoint = new GeoPoint(lat.intValue(), lng.intValue()); MapView.LayoutParams geoLP; geoLP = new MapView.LayoutParams(MapView.LayoutParams.WRAP_CONTENT, MapView.LayoutParams.WRAP_CONTENT, geoPoint, MapView.LayoutParams.TOP_LEFT); EditText editText2 = new EditText(get<strong>Application</strong>Context()); editText2.setText(“Location Pinned”); mapView.addView(editText2, geoLP); Panning the map will leave the fi rst TextView stationary in the upper left corner, while the second TextView will move to remain pinned to a particular position on the map. 241
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Professional Android Application su
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Professional Android Application D
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Professional Android Application D
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About the Author Originally from Pe
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Acknowledgments A big thank you goe
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Contents Chapter 2: Getting Started
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Contents xii Saving and Loading Fil
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Contents Chapter 10: Accessing Andr
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Introduction Now is an exciting tim
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Introduction covered, you can move
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Introduction At http://p2p.wrox.com
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Chapter 1: Hello, Android 2 Using t
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Chapter 1: Hello, Android An Open P
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Chapter 1: Hello, Android 6 ❑ ❑
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Chapter 1: Hello, Android 8 When ma
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Chapter 1: Hello, Android 10 In mar
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Chapter 1: Hello, Android 12 Each A
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Chapter 1: Hello, Android 14 ❑ Da
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Chapter 1: Hello, Android 16 ❑ an
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Getting Started All you need to sta
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Chapter 2: Getting Started Unless o
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Installing the ADT Plug-in Install
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Chapter 2: Getting Started 3. In th
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Chapter 2: Getting Started If every
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} lp = new LinearLayout.LayoutParam
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❑ ❑ ❑ ❑ ❑ Small screens w
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Chapter 2: Getting Started on how t
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Chapter 2: Getting Started To start
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Ensuring a Seamless User Experience
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Figure 2-11 Chapter 2: Getting Star
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} myListView.setAdapter(aa); Chapte
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Chapter 2: Getting Started A number
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Creating Applications and Activitie
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Chapter 3: Creating Applications an
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Creating Resources Chapter 3: Creat
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❑ ❑ #ARGB #ARRGGBB Chapter 3: C
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android:startOffset=”500” andro
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Referencing Resources in Resources
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} } Chapter 3: Creating Application
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Chapter 4: Creating User Interfaces
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Chapter 5: Intents, Broadcast Recei
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Data Storage, Retrieval, and Sharin
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Chapter 6: Data Storage, Retrieval,
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} Chapter 6: Data Storage, Retrieva
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} Chapter 6: Data Storage, Retrieva
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} } } Chapter 6: Data Storage, Retr
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Querying Your Database Chapter 6: D
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} // Open or create the database to
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} Chapter 9: Peer-to-Peer Communica
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Figure 9-4 Chapter 9: Peer-to-Peer
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} Chapter 9: Peer-to-Peer Communica
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Accessing Android Hardware Android
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Chapter 10: Accessing Android Hardw
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content.put(Audio.AudioColumns.DATE
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public void onShutter() { // TODO D
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public void setPitch(float pitch) {
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Chapter 11: Advanced Android Develo
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400 Android, getting started Androi
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402 databases databases creating ea
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404 interapplication communication
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406 passing custom class objects pa
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408 synchronizing threads synchroni
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Programmer to Programmer Get more
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Android™ Application Development - Bahar Ali Khan

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