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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Adding Custom Permissions to Send and Receive Broadcasts

As discussed in Updating the Manifest File for Internet Permission, an application must be granted permissions to access certain restricted features of the system, such as connecting to the Internet, sending SMS messages, making phone calls, reading the user’s contacts, taking photos, and so on. The user has to grant all or none of the permissions to the application at installation time, and it is the job of the application developer to list all the permissions the app needs by adding the <uses-permission> element to the manifest file. So far, we’ve added permissions to Yamba in order to access the Internet, kick off our boot-time service, and learn about network changes.

But now that we have our Updater service sending a broadcast action to our Timeline receiver, we might want to restrict permission to send and receive that broadcast to our own app. Otherwise, another app, knowing what our action looks like, could send it and cause actions in our application that we didn’t intend.

To fill up this security hole, we define our own permission and ask the user to grant it to the Yamba application. Next, we’ll enforce both sending and receiving the permissions.

Declaring Permissions in the Manifest File

The first step is to declare our permissions, explaining what they are, how they are to be used, and setting their protection level, shown in Example 11-11.

Example 11-11. Adding permissions to manifest file

<manifest>

  ...
  <!--  --> ...

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