You are previewing Learning Android.

Learning Android

Cover of Learning Android by Marko Gargenta Published by O'Reilly Media, Inc.
  1. Learning Android
    1. SPECIAL OFFER: Upgrade this ebook with O’Reilly
    2. A Note Regarding Supplemental Files
    3. Preface
      1. What’s Inside
      2. Conventions Used in This Book
      3. Using Code Examples
      4. Safari® Books Online
      5. How to Contact Us
      6. Acknowledgments
    4. 1. Android Overview
      1. Android Overview
      2. History
      3. Android Versions
      4. Summary
    5. 2. The Stack
      1. Stack Overview
      2. Linux
      3. Native Libraries
      4. Dalvik
      5. Application Framework
      6. Applications
      7. Summary
    6. 3. Quick Start
      1. Installing the Android SDK
      2. Hello, World
      3. The Emulator
      4. Summary
    7. 4. Main Building Blocks
      1. What Are Main Building Blocks?
      2. A Real-World Example
      3. Activities
      4. Intents
      5. Services
      6. Content Providers
      7. Broadcast Receivers
      8. Application Context
      9. Summary
    8. 5. Yamba Project Overview
      1. The Yamba Application
      2. Design Philosophy
      3. Project Design
      4. Part 1: Android User Interface
      5. Part 2: Preferences, Filesystem, Options Menu, and Intents
      6. Part 3: Android Services
      7. Part 4: Working with Databases
      8. Part 5: Lists and Adapters
      9. Part 6: Broadcast Receivers
      10. Part 7: Content Providers
      11. Part 8: System Services
      12. Summary
    9. 6. Android User Interface
      1. Two Ways to Create a User Interface
      2. Views and Layouts
      3. Starting the Yamba Project
      4. The StatusActivity Layout
      5. The StatusActivity Java Class
      6. Logging in Android
      7. Threading in Android
      8. Other UI Events
      9. Adding Color and Graphics
      10. Alternative Resources
      11. Optimizing the User Interface
      12. Summary
    10. 7. Preferences, the Filesystem, the Options Menu, and Intents
      1. Preferences
      2. The Options Menu
      3. Shared Preferences
      4. The Filesystem Explained
      5. Summary
    11. 8. Services
      1. The Yamba Application Object
      2. UpdaterService
      3. Looping in the Service
      4. Pulling Data from Twitter
      5. Summary
    12. 9. The Database
      1. About SQLite
      2. DbHelper
      3. First Example
      4. Update UpdaterService
      5. Refactoring Status Data
      6. Summary
    13. 10. Lists and Adapters
      1. TimelineActivity
      2. Basic TimelineActivity Layout
      3. About Adapters
      4. TimelineAdapter
      5. ViewBinder: A Better Alternative to TimelineAdapter
      6. Updating the Manifest File
      7. Base Activity
      8. Summary
    14. 11. Broadcast Receivers
      1. About Broadcast Receivers
      2. BootReceiver
      3. The TimelineReceiver
      4. Broadcasting Intents
      5. The Network Receiver
      6. Adding Custom Permissions to Send and Receive Broadcasts
      7. Summary
    15. 12. Content Providers
      1. Creating a Content Provider
      2. Using Content Providers Through Widgets
      3. Summary
    16. 13. System Services
      1. Compass Demo
      2. Location Service
      3. Updating Yamba to Use the Location Service
      4. Intent Service
      5. Sending Notifications
      6. Summary
    17. 14. The Android Interface Definition Language
      1. Implementing the Remote Service
      2. Implementing the Remote Client
      3. Summary
    18. 15. The Native Development Kit (NDK)
      1. What Is and Isn’t the NDK For?
      2. Problems Solved by the NDK
      3. An NDK Example: Fibonacci
      4. Summary
    19. Index
    20. About the Author
    21. Colophon
    22. SPECIAL OFFER: Upgrade this ebook with O’Reilly
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Pulling Data from Twitter

We now have a framework and are ready to make the actual connection to the online Twitter-like service, pull the status data, and display that data in our application. Twitter and Twitter-like services offer many different APIs to retrieve our friends’ updates. The jtwitter.jar library exposes most of them to us via the Twitter class. Perhaps one of the most appropriate methods is getFriendsTimeline(), which returns the 20 most recent posts made over the past 24 hours from the user and her friends.

To use this Twitter API feature, we need to connect to the online service. And to do that, we need the username, password, and root API for our online service. As you recall from the previous chapter, we have already refactored most of this functionality into the YambaApplication object (see The Yamba Application Object). We can reuse all those features here because our service is part of the same application and as such has access to the same Application object.

However, we do need to make a minor update to YambaApplication, because we would also like to know whether our service is running. To do that, we’ll add a flag to YambaApplication and provide setter and getter methods to access and update that flag:

public class YambaApplication extends Application
  implements OnSharedPreferenceChangeListener {
  private boolean serviceRunning; // 1 ... public boolean isServiceRunning() ...

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