Android™ Application Development - Bahar Ali Khan

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Chapter 8: Working in the Background 276 } alarmIntent = PendingIntent.getBroadcast(this, 0, intentToFire, 0); 6. Modify the onStart method to set an Alarm rather than use a Timer to schedule the next refresh (if automated updates are enabled). Setting a new Intent with the same action will automatically cancel the previous Alarm. @Override public void onStart(Intent intent, int startId) { SharedPreferences prefs = getSharedPreferences(Preferences.USER_PREFERENCE, Activity.MODE_PRIVATE); int minMagIndex = prefs.getInt(Preferences.PREF_MIN_MAG, 0); if (minMagIndex < 0) minMagIndex = 0; int freqIndex = prefs.getInt(Preferences.PREF_UPDATE_FREQ, 0); if (freqIndex < 0) freqIndex = 0; boolean autoUpdate = prefs.getBoolean(Preferences.PREF_AUTO_UPDATE, false); Resources r = getResources(); int[] minMagValues = r.getIntArray(R.array.magnitude); int[] freqValues = r.getIntArray(R.array.update_freq_values); minimumMagnitude = minMagValues[minMagIndex]; int updateFreq = freqValues[freqIndex]; if (autoUpdate) { int alarmType = AlarmManager.ELAPSED_REALTIME_WAKEUP; long timeToRefresh = SystemClock.elapsedRealtime() + updateFreq*60*1000; alarms.set(alarmType, timeToRefresh, alarmIntent); } else alarms.cancel(alarmIntent); refreshEarthquakes(); }; 7. You can now remove the updateTimer instance variable and the TimerTask instance doRefresh. Summary Services are one of the most compelling reasons to develop applications on the Android platform. In this chapter, you learned how to use these invisible application components to perform processing while your applications are hidden in the background. You were introduced to Toasts, a transient message box that lets you display information to users without stealing focus or interrupting their workfl ow.
Chapter 8: Working in the Background You used the Notifi cation Manager to send alerts to your users from within Services and Activities using customized LEDs, vibration patterns, and audio fi les to convey detailed event information. Using Alarms, you were able to preset events and actions on the device using Intents to broadcast actions or start Activities or Services. This chapter also demonstrated how to: ❑ ❑ ❑ ❑ Bind a Service to an Activity to make use of a more detailed, structured interface. Ensure that your applications remain responsive by moving time-consuming processing like network lookups onto worker threads. Use handlers to synchronize child threads with the main application GUI when performing operations using visual controls and Toasts. Create insistent and ongoing Notifi cations. In Chapter 9, you’ll be introduced to the communications features of Android. Starting with a look at the GTalk Service, you’ll learn how to send and receive text and data messages to transmit data between devices. You’ll then investigate the SMS functionality available for you to send and receive SMS text and data messages. 277
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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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Data Storage, Retrieval, and Sharin
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Chapter 6: Data Storage, Retrieval,
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Querying Your Database Chapter 6: D
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} // Open or create the database to
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Adding, Updating, and Deleting Cont
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} } break; Chapter 6: Data Storage,
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Maps, Geocoding, and Location-Based
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Chapter 7: Maps, Geocoding, and Loc
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} Chapter 7: Maps, Geocoding, and L
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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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