Recipe 6.10 Monitoring the State of Bluetooth

Android Versions
Level 1 and above
Permissions
android.permission.BLUETOOTH
android.permission.BLUETOOTH_ADMIN
Source Code to Download at Wrox.com
TurnOnBluetooth.zip

If your application uses Bluetooth connectivity, it is useful to know whether the user has just turned on Bluetooth, or just turned it off. This recipe shows how to monitor the state of Bluetooth on the device. For example, if you are writing a service that uses Bluetooth in the background, you need to closely monitor the state of the Bluetooth and start or stop your service appropriately.

Solution

To monitor the state of Bluetooth, create a Java class that extends the BroadcastReceiver base class, like this:

package net.learn2develop.turnonbluetooth; import android.bluetooth.BluetoothAdapter; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.widget.Toast; public class MyBTBroadcastReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { int state = intent.getExtras().getInt(BluetoothAdapter.EXTRA_STATE); switch (state) { case BluetoothAdapter.STATE_OFF: Toast.makeText(context, "Off", Toast.LENGTH_SHORT).show(); break; case BluetoothAdapter.STATE_TURNING_OFF: Toast.makeText(context, "Turning Off", Toast.LENGTH_SHORT).show(); break; case BluetoothAdapter.STATE_ON: Toast.makeText(context, "On", Toast.LENGTH_SHORT).show(); break; case BluetoothAdapter.STATE_TURNING_ON: ...

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