How to detect if wi-fi and / or bluetooth are connected

Based on my comment and believing that you are aware of what you are requesting, I will show you this open source code that looks at whether wi-fi is connected .

private static final String DEBUG_TAG = "NetworkStatusExample";
ConnectivityManager connMgr = (ConnectivityManager) 
        getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI); 
boolean isWifiConn = networkInfo.isConnected();
networkInfo = connMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
boolean isMobileConn = networkInfo.isConnected();
Log.d(DEBUG_TAG, "Wifi conectado: " + isWifiConn);
Log.d(DEBUG_TAG, "3G conectado: " + isMobileConn);

Source: link

Open Source for Bluetooth

• There is no way to retrieve a list of connected devices at application startup. The Bluetooth API does not allow you to query, instead it allows you to see the changes.

A hoaky job would be to retrieve the list of all known paired devices / ... then try to call each one (to determine if you are logged in).

• Alternatively, you can have background control with the Bluetooth API and write device states.

  public void onCreate() {        
  IntentFilter filter1 = new IntentFilter(BluetoothDevice.ACTION_ACL_CONNECTED);
  IntentFilter filter2 = new IntentFilter(BluetoothDevice.ACTION_ACL_DISCONNECT_REQUESTED);
  IntentFilter filter3 = new IntentFilter(BluetoothDevice.ACTION_ACL_DISCONNECTED);
  this.registerReceiver(mReceiver, filter1);
  this.registerReceiver(mReceiver, filter2);
  this.registerReceiver(mReceiver, filter3);
  }
  
  
  private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
  @Override
  public void onReceive(Context context, Intent intent) {
      String action = intent.getAction();
      BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
  
      if (BluetoothDevice.ACTION_FOUND.equals(action)) {
         ... //Device found
      }
      else if (BluetoothDevice.ACTION_ACL_CONNECTED.equals(action)) {
         ... //Device is now connected
      }
      else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
         ... //Done searching
      }
      else if (BluetoothDevice.ACTION_ACL_DISCONNECT_REQUESTED.equals(action)) {
         ... //Device is about to disconnect
      }
      else if (BluetoothDevice.ACTION_ACL_DISCONNECTED.equals(action)) {
         ... //Device has disconnected
      }           
  }
  };
  

Do not forget the permission: <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

Source: link