Android Broadcast Receiver - presented at beginner level workshop conducted by HasGeek

1. Broadcast Receiver
●
Broadcasts are system wide events
●
Examples
– SMS received , battery low, bluetooth,
●
Broadcast-Receiver
–
Handles these events

2. Broadcast Receiver
●
Cannot display User Inferace
●
Must be handled within 10 seconds
●
Can start a service for background processing

3. Broadcast Receiver subclass
class ........ extends BroadcastReceiver
{
onReceive( )
{
your code to handle the broadcast event
}
}

4. Steps
●
create subclass of BroadcastReceiver
●
onReceive()
●
Get the intent – check if it has SMS info
●
Register our receiver in manifest
●
Set the SMS permissions in manifest

5. Steps
●
create subclass of BroadcastReceiver
●
onReceive()
●
Register our receiver in manifest
●
Set the SMS permissions in manifest
●
Get the intent – check if it has SMS info

6. onReceive
String action="android.provider.Telephony.SMS_RECEIVED";
public void onReceive(Context c, Intent i) {
final Bundle bundle = i.getExtras();
if(i.getAction().equals(action))
{
Toast.makeText(c, "SMS Received", Toast.LENGTH_SHORT).show();
String msg= parseSMS(bundle);
Toast.makeText(c, msg, Toast.LENGTH_SHORT).show();
}
}

7. Extract SMS
●
Intent
Bundle
PDU
SMS

8. Extract SMS
●
Intent
Bundle
PDU
Bundle bundle = intent.getExtras();
Object[] pdusObj = bundle.get("pdus");
SmsMessage msg =
SmsMessage.createFromPdu((byte[])
pdusObj[0]);
SMS

9. Extract SMS
●
Intent
Bundle
PDU
SMS

10. Examples of broadcasts
●
Examples for system events Event Usage
●
Intent.ACTION_BATTERY_LOW
●
Intent.ACTION_BATTERY_OKAY The battery level has risen again
●
Intent.ACTION_BOOT_COMPLETED
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Intent.ACTION_DEVICE_STORAGE_LOW Storage space on the device is getting limited
●
Intent.ACTION_DEVICE_STORAGE_OK The storage situation has improved again
●
Intent.ACTION_HEADSET_PLUG A headset was plugged in or a previously plugged headset was removed
●
Intent.ACTION_LOCALE_CHANGED
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Intent.ACTION_MY_PACKAGE_REPLACED
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Intent.ACTION_PACKAGE_ADDED A new app has been installed
●
Intent.ACTION_POWER_CONNECTED
●
Intent.ACTION_POWER_DISCONNECTED The device has been disconnected again
●
KeyChain.ACTION_STORAGE_CHANGED The keystore changed
●
BluetoothDevice.ACTION_ACL_CONNECTED A Bluetooth ACL connection has been established
●
●
The battery level has fallen below a threshold
Android is up and running
The user changed the language of the device
Your app has been updated
The device has been plugged in
AudioManager.ACTION_AUDIO_BECOMING_NOISY The internal audio speaker is about to be used instead
of other output means (like a headset)