Android™ Application Development - Bahar Ali Khan

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Chapter 7: Maps, Geocoding, and Location-Based Services 222 To do a forward-geocoding lookup, call getFromLocationName on a Geocoder instance. Pass in the location you want the coordinates for and the maximum number of results to return, as shown in the snippet below: List result = geocoder.getFromLocationName(aStreetAddress, maxResults); The returned list of Addresses can include multiple possible matches for the named location. Each address result will include latitude and longitude and any additional address information available for those coordinates. This is useful to confi rm that the correct location was resolved, as well as providing address specifi cs when searching for landmarks. As with reverse geocoding, if no matches are found, null will be returned. The availability, accuracy, and granularity of geocoding results will depend entirely on the database available for the area you’re searching. When doing forward lookups, the Locale specifi ed when creating the Geocoder object is particularly important. The Locale provides the geographical context for interpreting your search requests, as the same location names can exist in multiple areas. Where possible, consider selecting a regional Locale to help avoid place name ambiguity. Additionally, try to use as many address details as possible. For example, the following code snippet demonstrates a forward geocode for a New York street address: Geocoder fwdGeocoder = new Geocoder(this, Locale.US); String streetAddress = “160 Riverside Drive, New York, New York”; List locations = null; try { locations = fwdGeocoder.getFromLocationName(streetAddress, 10); } catch (IOException e) {} For even more specifi c results, use the getFromLocationName overload, that lets you restrict your search to within a geographical bounding box, as shown in the following snippet: List locations = null; try { locations = fwdGeocoder.getFromLocationName(streetAddress, 10, n, e, s, w); } catch (IOException e) {} This overload is particularly useful in conjunction with a MapView as you can restrict the search to within the visible map. Geocoding “Where Am I?” Using the Geocoder, you can determine the street address at your current location. In this example, you’ll further extend the “Where Am I?” project to include and update the current street address whenever the device moves. Open the WhereAmI Activity. Modify the updateWithNewLocation method to instantiate a new Geocoder object, and call the getFromLocation method, passing in the newly received location and limiting the results to a single address.
Chapter 7: Maps, Geocoding, and Location-Based Services Extract each line in the street address, as well as the locality, postcode, and country, and append this information to an existing Text View string. private void updateWithNewLocation(Location location) { String latLongString; TextView myLocationText; myLocationText = (TextView)findViewById(R.id.myLocationText); } String addressString = “No address found”; if (location != null) { double lat = location.getLatitude(); double lng = location.getLongitude(); latLongString = “Lat:” + lat + “\nLong:” + lng; double latitude = location.getLatitude(); double longitude = location.getLongitude(); Geocoder gc = new Geocoder(this, Locale.getDefault()); try { List addresses = gc.getFromLocation(latitude, longitude, 1); StringBuilder sb = new StringBuilder(); if (addresses.size() > 0) { Address address = addresses.get(0); for (int i = 0; i < address.getMaxAddressLineIndex(); i++) sb.append(address.getAddressLine(i)).append(“\n”); sb.append(address.getLocality()).append(“\n”); sb.append(address.getPostalCode()).append(“\n”); sb.append(address.getCountryName()); } addressString = sb.toString(); } catch (IOException e) {} } else { latLongString = “No location found”; } myLocationText.setText(“Your Current Position is:\n” + latLongString + “\n” + addressString); If you run the example now, it should appear as shown in Figure 7-4. Figure 7-4 223
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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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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 8: Working in the Backgroun
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Peer-to-Peer Communication In this
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Chapter 9: Peer-to-Peer Communicati
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} Chapter 9: Peer-to-Peer Communica
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Handling Subscription Requests Chap
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Figure 9-4 Chapter 9: Peer-to-Peer
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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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