Bluetooth server and BroadCastReceiver

Question

My application stores an open bluetooth server server with a special UUID so that another device can connect and transfer files. I am a little confused regarding BroadcastReceiver .

In my class that extends Activity , I want to check the status of the bluetooth adapter. But my BroadcastReceiver never works. I tried using BroadcastReceiver this way:

 public class MainClass extends Activity { public void onCreate(Bundle b) { super.onCreate(b); IntentFilter filter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED); registerReceiver(mReceiver, filter); } private final BroadcastReceiver mReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { final String action = intent.getAction(); Log.w("BroadcastReceiver: ", "Inside!"); if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) { final int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR); switch (state) { case BluetoothAdapter.STATE_OFF: Log.d("Bluetooth Receiver", "State-off"); Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE); startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT); break; case BluetoothAdapter.STATE_TURNING_OFF: Log.d("Bluetooth Receiver", "State turning off"); break; case BluetoothAdapter.STATE_ON: Log.d("Bluetooth Receiver", "State-on"); btCom = new BluetoothCommunicator(MainClass.this, lastCases, nist); btCom.startServer(); break; case BluetoothAdapter.STATE_TURNING_ON: Log.d("Bluetooth Receiver", "State turning on"); break; } } } }; } 

I have a question regarding states:

• Is the STATE_ON status disabled only when bluetooth is turned on during operation? Or can I launch the application with bluetooth turned on and this event will be fired? Cause I want to run the btCom.startServer() method if Bluetooth is turned on.

I also read that I need to register a broadcast receiver in my manifest file, how can I do this if BroadcastReceiver is in a class that extends Activity? If I had this BroadcastReceiver in a separate class, I would do it like this:

Say my package name was com.workbench and my class name was BluetoothReceiver

The manifest will look something like this:

  <receiver android:name="com.workbench.BluetoothReceiver"></receiver> 

Answer 1

The BluetoothAdapter.ACTION_STATE_CHANGED broadcast BluetoothAdapter.ACTION_STATE_CHANGED dispatched when the status of the Bluetooth adapter changes. You will only see this when the state of the adapter changes.

You can check the current status of the bluetooth adapter by calling BluetoothAdapter.isEnabled() .

You only need to register BroadcastReceiver in the manifest if you want to receive Intent broadcasts when your application is not running. How you implemented BroadcastReceiver (as an anonymous class) cannot be registered in the manifest.