Android Cookbook www.it-ebooks.info www.it-ebooks.info Android Cookbook Android Community Experts Beijing • Cambridge • Farnham • Köln • Sebastopol • Tokyo www.it-ebooks.info Android Cookbook by Android Community Experts Copyright © 2011 Ian Darwin and Contributors. All rights reserved. Printed in the United States of America. Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472. O’Reilly books may be purchased for educational, business, or sales promotional use. Online editions are also available for most titles (http://safari.oreilly.com). For more information, contact our corporate/ institutional sales department: (800) 998-9938 or corporate@oreilly.com. Editor: Ian F. Darwin Production Editor: Copyeditor: Proofreader: Indexer: Cover Designer: Interior Designer: Illustrators: and November 2011: First Edition. Revision History for the First Edition: See http://oreilly.com/catalog/errata.csp?isbn=9781449388416 for release details. Android is a trademark of Google, Inc. for their open-source operating environment for mobile devices. Linux is a trademark of Linus Torvalds. Java is a trademark of Oracle America Corporation (formerly Sun Microsystems). Nutshell Handbook, the Nutshell Handbook logo, and the O’Reilly logo are registered trademarks of O’Reilly Media, Inc. !!FILL THIS IN!! and related trade dress are trademarks of O’Reilly Media, Inc. Many of the designations uses by manufacturers and sellers to distinguish their products are claimed as trademarks. Where those designations appear in this book, and O’Reilly Media, Inc. was aware of a trademark claim, the designations have been printed in caps or initial caps While every precaution has been taken in the preparation of this book, the publisher and authors assume no responsibility for errors or omissions, or for damages resulting from the use of the information con- tained herein. ISBN: 978-1-449-38841-6 [?] 1318018084 www.it-ebooks.info Table of Contents Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii 1. Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1 Introduction: Getting Started 1 1.2 Learning the Java Language 1 1.3 Hello World - Command Line 3 1.4 Hello World - Eclipse Version 5 1.5 Set Up an Android Virtual Device for Apps Testing 10 1.6 Set Up an IDE on Windows to Develop for Android 23 1.7 Android Lifecycle 32 1.8 Opening a Web Page, Phone Number or anything else with an Intent 33 1.9 Email Text From a View 35 1.10 Sending an email with attachments 38 1.11 Installing .apk files on the emulator 40 1.12 Installing apps onto an Android Emulator 40 1.13 Android Epoch HTML/Javascript Calendar 43 1.14 Sharing Java classes from another Eclipse Project 48 1.15 Referencing libraries to implement external functionality 49 1.16 Use SDK Samples to Help Avoid Head Scratching 50 1.17 Keeping the Android SDK Updated 55 1.18 Five Ways to Wire Up an Event Listener 61 1.19 Taking a Screenshot from the Emulator/Android Device 69 1.20 Program: A Simple CountDownTimer example 70 1.21 Program: Tipster, a tip calculator for the Android OS 73 2. Designing a successful Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 2.1 Introduction: Designing a Successful Android application 91 2.2 Keeping a Service running while other apps are on display 95 2.3 Starting a service after phone reboot 97 2.4 Exception Handling 98 2.5 Sending/Receive broadcast message 100 v www.it-ebooks.info 2.6 Android's Application Object as a "Singleton" 101 2.7 Keeping data when the user rotates the device 103 2.8 Creating a Responsive Application using Threads 105 2.9 Eating Too Much CPU Time In The UI Causes A Nasty Result 107 2.10 AsyncTask: Do background tasks and modify the GUI 113 2.11 Monitoring the Battery Level of your Android Device 114 2.12 Splash Screens in Android: Method 1 115 2.13 Splash Screens in Android: Method 2 117 2.14 Designing a Conference/*Camp/Hackathon App 123 2.15 Implementing Autocompletion in Android. 124 2.16 Using Google Analytics in Android Application 126 2.17 Using AsyncTask to do background processing 128 2.18 A Simple Torch Light 134 2.19 Adapting Android Phone Application to Tablet 136 2.20 First Run preferences 138 2.21 Formatting the time and date display 139 2.22 Controlling Input with KeyListeners 142 2.23 Android Application Data Backup 145 2.24 Making password fields 151 2.25 Working Without Tooltips: Use Hints Instead 152 3. Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157 3.1 Introduction: Testing 157 3.2 How to TDD(test driven development) Android App 157 3.3 How to troubleshoot "The application has stopped unexpectedly. Please try again" 158 3.4 Debugging using Log.d and LogCat 161 3.5 Keep Your App Snappy With StrictMode 163 3.6 Barrel of Monkeys 164 3.7 Sending text messages and placing calls between AVDs 165 3.8 Activity LifeCycle Scenarios for Testing 166 4. Content Providers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175 4.1 Introduction: Content Providers 175 4.2 Retrieving Data from a Content Provider 175 4.3 Writing a Content Provider 177 4.4 Android Remote Service 179 5. Graphics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185 5.1 Introduction: Graphics 185 5.2 Getting Screenshots 185 5.3 Using a Custom Font 186 5.4 Draw a spinning cube with OpenGL ES 191 vi | Table of Contents www.it-ebooks.info 5.5 Adding control to the OpenGL spinning cube 196 5.6 Taking a Picture Using an Intent 199 5.7 Taking a Picture Using android.media.Camera 201 5.8 Using AndroidPlot to display charts and graphs in your Android application. 205 5.9 Use Inkscape to Create an Android Launcher Icon 207 5.10 Easy Launcher Icons from OpenClipArt.org using Paint.NET 216 5.11 Android HTML5 RGraph Charting 228 5.12 Simple Raster Animation 232 6. Graphical User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239 6.1 Introduction: GUI 239 6.2 User Interface Guidelines (placeholder) 240 6.3 SlidingDrawer Overlapping other UI components 240 6.4 Android 3.0 Photo Gallery 244 6.5 Building a UI using Fragments API of Android 3.0 in Android 2.2 246 6.6 Haptic Feedback 250 6.7 Handling Configuration Changes by Decoupling View from Model 254 6.8 Let Them See Stars: Using RatingBar 257 6.9 Invoke an action handler when a Button is pressed 260 6.10 Creating an Alert Dialog. 263 6.11 Customize the SlidingDrawer component to animate/transition from the top down. 264 6.12 Use a Timepicker widget 266 6.13 Formatting with Correct Plurals 268 6.14 Feed AutoCompleteTextView using a SQLite database query 272 6.15 Change The Enter Key to "Next" on the Soft Keyboard 273 6.16 How to Create a Simple Widget 277 6.17 Make a View Shake 280 6.18 Using CheckBoxes and RadioButtons 281 6.19 Creating a Notification in the Status Bar 286 6.20 Autocompletion with Icons/Images 288 6.21 Creating your own Custom Title Bar 295 6.22 iPhone-like wheel picker for selection 298 6.23 Simple Calendar 302 6.24 Formatting Numbers 310 6.25 Start a Second Screen from the First 314 6.26 Creating a Tabbed Dialog 322 6.27 Creating a Custom Dialog with buttons, images and text 326 6.28 Create a Custom Menu 328 6.29 Loading Screen in between two Activities 330 6.30 Implementing reactions on click of items in a Custom Menu. 333 6.31 Navigate different activities within a TabView 336 Table of Contents | vii www.it-ebooks.info 6.32 Drop-down Chooser via the Spinner Class 338 6.33 Effective UI design using Image Buttons 340 6.34 Pinch to zoom 343 6.35 Add a Border with Rounded Corners to a Layout 346 6.36 Creating a ProgressDialog in Android. 347 6.37 Creating a Submenu. 349 6.38 Processing key press events in an Activity. 351 6.39 Constrain EditText Values with Attributes and the TextWatcher Interface 352 6.40 Gesture Detection in Android 355 6.41 Customizing the Look of a Toast 362 6.42 Using SlidingDrawer to Overlap Other Components 363 7. GUI: ListView . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 367 7.1 Introduction: ListView 367 7.2 Building list-based applications with ListView 367 7.3 'No data' View for Lists 372 7.4 Advanced ListView: populating a list with images and text 373 7.5 ListView with Icons/images 379 7.6 Sectioned Headers in ListViews 386 7.7 Making Lists Behave Nicely 392 7.8 Writing A Custom List Adapter 393 7.9 Orientation Changes : From ListView data values to Landscape Charting 396 8. Multimedia . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 407 8.1 Introduction: Multimedia 407 8.2 Play a Youtube Video 407 8.3 Using Gallery with ImageSwitcher 408 8.4 Grabbing a video using MediaRecorder 411 8.5 Android Face Detection 414 8.6 Playing audio from a file 417 8.7 Playing Audio without Interaction 420 8.8 Using Speech to Text 421 8.9 Making the Device Speak with TTS 423 9. Data Persistence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 427 9.1 Listing a Directory 427 9.2 Default shared preferences consistency check 429 9.3 Advanced text search 431 9.4 How to push string-values using Intent.putExtra() 437 9.5 Retrieving data from a Sub-Activity back to your Main Activity 439 9.6 Getting total and free space on the SD card 442 viii | Table of Contents www.it-ebooks.info 9.7 Creating a SQLite database in an Android application. 442 9.8 Retrieving data from a SQLite database. 444 9.9 Inserting values into a SQLite database. 445 9.10 Work With Dates in SQLite 445 9.11 Parsing JSON using the Jackson Parser 448 9.12 Parsing an XML document using the DOM API 451 9.13 Parsing an XML document using an XmlPullParser 453 9.14 Accessing data from a file shipped with the App rather than in the filesystem 456 9.15 Adding a Contact 457 9.16 Reading Contact Data 461 9.17 Parsing JSON using JSONObject 463 10. Telephone Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 467 10.1 Introduction: Telephone Applications 467 10.2 Do something when the phone rings 467 10.3 Process outgoing calls 471 10.4 Dialing the phone 475 10.5 Sending single or multipart SMS messages 476 10.6 Receiving an SMS in an Android Application. 478 10.7 Using Emulator Controls to send SMS to the Emulator. 480 10.8 Android TelephonyManager. 480 11. Networked Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 491 11.1 Introduction: Networking 491 11.2 Using a RESTful Web Service 491 11.3 Extracting Information from Unstructured Text using Regular Expressions 494 11.4 Parsing RSS/ATOM feeds parsing with ROME 496 11.5 Using MD5 to Digest Free Text 500 11.6 Converting text into hyperlinks 502 11.7 Accessing a web page through your Android application 503 11.8 Customizing a WebView 505 12. Gaming and Animation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 507 12.1 Introduction: Gaming and Animation 507 12.2 Android Game Programming - Introduction to Flixel-Android 508 12.3 Introduction to Game Programming using AndEngine (Android- Engine) 510 13. Social Networking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 517 13.1 Facebook Integration 517 13.2 Social Networking Integration using Http 525 Table of Contents | ix www.it-ebooks.info 13.3 Loading a user's Twitter timeline (using JSON) 528 14. Location and Map Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 533 14.1 Introduction: Location-Aware Applications 533 14.2 Getting Location Information 533 14.3 Access GPS information anywhere in your application 535 14.4 Mocking GPS Coordinates On A Device 537 14.5 Geocoding and Reverse Geocoding 539 14.6 Getting ready for Google Maps development 540 14.7 Using Google Maps in your Android App 547 14.8 How to show your current location in a map 548 14.9 To Add Device's current location to Google Maps 549 14.10 Draw a location marker on a Google MapView 550 14.11 Drawing multiple location markers on a MapView 556 14.12 Creating Overlays for a Google MapView 560 14.13 Changing Views of a MapView. 561 14.14 Draw overlay icon without using Drawable 562 14.15 Location search on Google maps 567 14.16 MapView inside TabView 568 14.17 Handling longpress in a map 572 14.18 Using OpenStreetMap 575 14.19 Creating overlays in OpenStreetMaps 576 14.20 Using a scale on an OpenStreetMap 579 14.21 Handling touch events on an OpenStreetMap Overlay 582 14.22 Getting location updates with OpenStreetMaps 584 15. Accellerometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 593 15.1 Using the accelerometer to detect shaking of the device 593 15.2 Introduction: Sensors 596 15.3 Checking for device facing up or facing down based on screen orientation using Accelerometer. 597 15.4 Finding the orientation of an Android device using Orientation sensor. 598 15.5 Checking for the Presence or Absence of a Sensor 600 15.6 Reading the Temperature Sensor 601 16. Bluetooth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 603 16.1 Introduction: Bluetooth 603 16.2 Connecting to Bluetooth enabled device 603 16.3 Enabling Bluetooth and making the device Discoverable. 606 16.4 Listening for Bluetooth Connection Requests. 607 16.5 Bluetooth Device discovery 609 x | Table of Contents www.it-ebooks.info [...]... version="1.0" encoding="utf-8"?> . Android Cookbook www.it-ebooks.info www.it-ebooks.info Android Cookbook Android Community Experts Beijing • Cambridge • Farnham • Köln • Sebastopol • Tokyo www.it-ebooks.info Android Cookbook by. 199 5.7 Taking a Picture Using android. media.Camera 201 5.8 Using AndroidPlot to display charts and graphs in your Android application. 205 5.9 Use Inkscape to Create an Android Launcher Icon 207 5.10. book was written by several dozens of Android developers from the Android community at large. Development occurred in the open, on the web site Android- Cookbook. com, which I wrote to allow people