Android L04 - Notifications and Threading
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The document discusses various interaction design concepts in Android including toasts, notifications, threads, broadcast receivers, and alarms. It provides code examples for creating toasts, setting notification priorities, and scheduling alarms to fire at boot or at specific times using the AlarmManager. Broadcast receivers can be used to set alarms during device boot by listening for the BOOT_COMPLETED intent filter and implementing the onReceive callback.
![Alarms Use Cases
• MMS – Retry Scheduler
• Bluetooth [Discoverable] Timeout
• Notifications
• Syncing data with the server
• ..etc.](https://image.slidesharecdn.com/g8qxrepbtsgnhs3uqbz4-signature-d7fc93685f48ced0e918b543247b397a90fb660f95de6c6868faa576ac2937cf-poli-150922085317-lva1-app6892/85/Android-L04-Notifications-and-Threading-15-320.jpg)
Android L04 - Notifications and Threading
- 2. Toast
- 3. Toast
- 4. Toast Context context = getApplicationContext(); CharSequence text = "Hello toast!"; int duration = Toast.LENGTH_SHORT; Toast toast = Toast.makeText(context, text, duration); toast.show();
- 7. Five priority levels: – PRIORITY_MIN (-2) to PRIORITY_MAX (2); – if not set, the priority defaults to PRIORITY_DEFAULT (0). NotificationsPriorities
- 8. Notifications NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this) .setSmallIcon(android.R.drawable.stat_notify_more) .setContentTitle("My notification") .setContentText("Hello World!");
- 9. Notifications NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this) .setSmallIcon(android.R.drawable.stat_notify_more) .setContentTitle("My notification") .setContentText("Hello World!");
- 10. Threads UI Thread, AsyncTask, Handler
- 12. Alarms
- 14. Google Cloud Messaging (GCM) with SyncAdapter
- 15. Alarms Use Cases • MMS – Retry Scheduler • Bluetooth [Discoverable] Timeout • Notifications • Syncing data with the server • ..etc.
- 16. Alarms Firing • ELAPSED_REALTIME – Fires the pending intent based on the amount of time since the device was booted, but doesn't wake up the device. The elapsed time includes any time during which the device was asleep. • ELAPSED_REALTIME_WAKEUP – Wakes up the device and fires the pending intent after the specified length of time has elapsed since device boot. • RTC – Fires the pending intent at the specified time but does not wake up the device. • RTC_WAKEUP – Wakes up the device to fire the pending intent at the specified time. https://developer.android.com/training/scheduling/alarms.html
- 18. RTC private AlarmManager alarmMgr; // Set the alarm to start at approximately 2:00 p.m. Calendar calendar = Calendar.getInstance(); calendar.setTimeInMillis(System.currentTimeMillis()); calendar.set(Calendar.HOUR_OF_DAY, 14); alarmMgr.setInexactRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), AlarmManager.INTERVAL_DAY, alarmIntent);
- 20. Fire Alarm on Booting Example
- 21. BroadcastReceiver on Booting • Add a permission: <uses-‐permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/> • Implement a BroadcastReceiver called SampleBootReceiver: public class SampleBootReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { if (intent.getAction().equals("android.intent.action.BOOT_COMPLETED")) { // Set the alarm here. } } } • Set the SampleBootReceiver to fire on Boot: <receiver android:name=".SampleBootReceiver" android:enabled="false"> <intent-‐filter> <action android:name="android.intent.action.BOOT_COMPLETED"></action> </intent-‐filter> </receiver>
- 22. BroadcastReceiver on Booting • Add a permission: <uses-‐permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/> • Implement a BroadcastReceiver called SampleBootReceiver: public class SampleBootReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { if (intent.getAction().equals("android.intent.action.BOOT_COMPLETED")) { // Set the alarm here. } } } • Set the SampleBootReceiver to fire on Boot: <receiver android:name=".SampleBootReceiver" android:enabled="false"> <intent-‐filter> <action android:name="android.intent.action.BOOT_COMPLETED"></action> </intent-‐filter> </receiver>
- 23. BroadcastReceiver on Booting • Add a permission: <uses-‐permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/> • Implement a BroadcastReceiver called SampleBootReceiver: public class SampleBootReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { if (intent.getAction().equals("android.intent.action.BOOT_COMPLETED")) { // Set the alarm here. } } } • Set the SampleBootReceiver to fire on Boot: <receiver android:name=".SampleBootReceiver" android:enabled="false"> <intent-‐filter> <action android:name="android.intent.action.BOOT_COMPLETED"></action> </intent-‐filter> </receiver>