Android™ Application Development - Bahar Ali Khan

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Chapter 7: Maps, Geocoding, and Location-Based Services 208 ❑ ❑ ❑ Turn geographical locations into street addresses and vice versa. Create and customize map-based Activities using MapView and MapActivity. Add Overlays to your maps. Using Location-Based Services Location-based services (LBS) is an umbrella term used to describe the different technologies used to fi nd the device’s current location. The two main LBS elements are: ❑ LocationManager Provides hooks to the location-based services. ❑ LocationProviders Each of which represents a different location-fi nding technology used to determine the device’s current location. Using the Location Manager, you can: ❑ ❑ ❑ Obtain your current location. Track movement. Set proximity alerts for detecting movement into and out of a specifi ed area. Setting up the Emulator with Test Providers Location-based services are dependant on device hardware for fi nding the current location. When developing and testing with the emulator, your hardware is virtualized, and you’re likely to stay in pretty much the same location. To compensate, Android includes hooks that let you emulate Location Providers for testing locationbased applications. In this section, you’ll learn how to mock the position of the supported GPS provider. If you’re planning on doing location-based application development and using the Android emulator, this section will show how to create an environment that simulates real hardware and location changes. In the remainder of this chapter, it will be assumed that you have used the examples in this section to update the location for, the GPS_PROVIDER within the emulator. Updating Locations in Emulator Location Providers Use the Location Controls available from the DDMS perspective in Eclipse (shown in Figure 7-1) to push location changes directly into the test GPS_PROVIDER.
Chapter 7: Maps, Geocoding, and Location-Based Services Figure 7-1 Figure 7-1 shows the Manual and KML tabs. Using the Manual tab, you can specify particular latitude/ longitude pairs. Alternatively, the KML and GPX tabs let you load KML (Keyhole Markup Language) and GPX (GPS Exchange Format) fi les, respectively. Once loaded, you can jump to particular waypoints (locations) or play back each location sequentially. Most GPS systems record track fi les using GPX, while KML is used extensively online to defi ne geographic information. You can handwrite your own KML fi le or generate one automatically using Google Earth and fi nding directions between two locations. All location changes applied using the DDMS Location Controls will be applied to the GPS receiver, which must be enabled and active. Note that the GPS values returned by getLastKnownLocation will not change unless at least one application has requested location updates. Create an <strong>Application</strong> to Manage Test Location Providers In this example, you’ll create a new project to set up the emulator to simplify testing other location-based applications. Running this project will ensure that the GPS provider is active and updating regularly. 1. Create a new Android project, TestProviderController, which includes a TestProviderController Activity. package com.paad.testprovidercontroller; import java.util.List; import android.app.Activity; import android.content.Context; import android.location.Criteria; import android.location.Location; import android.location.LocationManager; import android.location.LocationListener; import android.location.LocationProvider; 209
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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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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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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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Android™ Application Development - Bahar Ali Khan

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