I need to do a scan of bluetooth devices in the surrounding area for 6 to 12 seconds. After this time I need to stop the discovery of new devices.
The following code should:
- Start scanning for bluetooth devices
- Print out any which are found
- After 6 seconds, cancel all discovery and repeat process
The problem is that the bluetooth discovery is never cancelled. After this code runs for a minute or two, onReceive will get called tens of times in the same second...
public void startTrackingButton(View view) {
Log.d("MAIN", "Track button pressed, isTracking: " + !isTracking);
if (isTracking) {
isTracking = false;
} else {
isTracking = true;
Thread keepScanning = new Thread(new Runnable() {
@Override
public void run() {
while (isTracking) {
if (mBluetoothAdapter.isDiscovering()) {
Log.d("MAIN", "Cancelling discovery!");
Log.d("MAIN", String.valueOf(mBluetoothAdapter.cancelDiscovery() + ":" + mBluetoothAdapter.getState()));
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
}
startTracking();
try {
Thread.sleep(6000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
});
keepScanning.start();
}
}
private void startTracking() {
Log.d("MAIN", "Starting Discovery...");
mBluetoothAdapter.startDiscovery();
// Create a BroadcastReceiver for ACTION_FOUND
BroadcastReceiver mReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
Log.d("MAIN", "Device Found...");
String action = intent.getAction();
// When discovery finds a device
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// Get the BluetoothDevice object from the Intent
BluetoothDevice device = intent
.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
// Add the name and address to an array adapter to show in a
// ListView
Log.d("MAIN:",
device.getName() + "\n" + device.getAddress());
}
}
};
// Register the BroadcastReceiver
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(mReceiver, filter); // Don't forget to unregister
// during onDestroy
}
Here is my logcat output:
//onReceive gets called many times in the same second???
05-01 22:09:56.949: D/MAIN(3757): Cancelling discovery!
05-01 22:09:56.969: D/MAIN(3757): false:12 ///THIS SHOULD BE TRUE
05-01 22:09:56.969: D/MAIN(3757): Starting Discovery...
05-01 22:10:03.009: D/MAIN(3757): Starting Discovery...
05-01 22:10:03.579: D/MAIN(3757): Device Found...
05-01 22:10:03.579: D/MAIN:(3757): TOMSELLECK
05-01 22:10:03.579: D/MAIN:(3757): 06:07:08:09:A1:A1
05-01 22:10:03.579: D/MAIN(3757): Device Found...
05-01 22:10:03.579: D/MAIN:(3757): TOMSELLECK
05-01 22:10:03.579: D/MAIN:(3757): 06:07:08:09:A1:A1
05-01 22:10:03.589: D/MAIN(3757): Device Found...
05-01 22:10:03.589: D/MAIN:(3757): TOMSELLECK
05-01 22:10:03.589: D/MAIN:(3757): 06:07:08:09:A1:A1
05-01 22:10:03.589: D/MAIN(3757): Device Found...
05-01 22:10:03.589: D/MAIN:(3757): TOMSELLECK
05-01 22:10:03.589: D/MAIN:(3757): 06:07:08:09:A1:A1
05-01 22:10:03.589: D/MAIN(3757): Device Found...
05-01 22:10:03.589: D/MAIN:(3757): TOMSELLECK
05-01 22:10:03.589: D/MAIN:(3757): 06:07:08:09:A1:A1
Does anybody know how I can properly cancel all current and pending Bluetooth discovery??
Thanks for your help!
P.S The reason I need to repeat the process is to get fresh signal strength values from nearby devices.
