Android™ Application Development - Bahar Ali Khan

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Chapter 7: Maps, Geocoding, and Location-Based Services 246 } } } RectF oval = new RectF(myPoint.x-rad, myPoint.y-rad, myPoint.x+rad, myPoint.y+rad); canvas.drawOval(oval, paint); 6. Return to the EarthquakeMap class. Within the onCreate method, create a Cursor that returns the earthquakes you want to display on the map. Use this Cursor to create a new EarthquakeOverlay before adding the new instance to the Map View’s list of overlays. Cursor earthquakeCursor; @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.earthquake_map); String earthquakeURI = EarthquakeProvider.CONTENT_URI; earthquakeCursor = getContentResolver().query(earthquakeURI, null, null, null, null); } MapView earthquakeMap = (MapView)findViewById(R.id.map_view); EarthquakeOverlay eo = new EarthquakeOverlay(earthquakeCursor); earthquakeMap.getOverlays().add(eo); 7. Finally, override onResume to call requery on the Earthquake result set whenever this Activity becomes visible. Also, override onPause and onDestroy to optimize use of the Cursor resources. @Override public void onResume() { earthquakeCursor.requery(); super.onResume(); } @Override public void onPause() { earthquakeCursor.deactivate(); super.onPause(); } @Override public void onDestroy() { earthquakeCursor.close(); super.onDestroy(); } 8. If you run the application and select Earthquake Map from the main menu, your application should appear as shown in Figure 7-8.
Summary Chapter 7: Maps, Geocoding, and Location-Based Services Figure 7-8 Location-based services, the Geocoder, and MapViews are available to create intuitive, location-aware applications that feature geographical information. This chapter introduced the Geocoder and showed how to perform forward and reverse geocoding lookups to translate between map coordinates and street addresses. You were introduced to locationbased services, used to fi nd the current geographical position of the device. You also used them to track movement and create proximity alerts. Then you created interactive map applications. Using Overlays and Views, you annotated MapViews with 2D graphics, as well as markers in the form of OverlayItems and Views (including ViewGroups and layouts). In Chapter 8, you’ll learn how to work from the background. You’ll be introduced to the Service component and learn how to move processing onto background threads. To interact with the user while hidden from view, you’ll use Toasts to display transient messages and the Notifi cation Manager to ring, vibrate, and fl ash the phone. 247
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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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Querying Your Database Chapter 6: D
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} // Open or create the database to
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Adding, Updating, and Deleting Cont
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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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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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