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- public class MainActivity extends Activity {
- private static final String TAG = "bluetooth1";
- Button btnOn, btnOff;
- private BluetoothAdapter btAdapter = null;
- private BluetoothSocket btSocket = null;
- private OutputStream outStream = null;
- // SPP UUID service
- private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
- // MAC-address of Bluetooth module (you must edit this line)
- private static String address = "00:15:FF:F2:19:5F";
- /** Called when the activity is first created. */
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
- btnOn = (Button) findViewById(R.id.btnOn);
- btnOff = (Button) findViewById(R.id.btnOff);
- btAdapter = BluetoothAdapter.getDefaultAdapter();
- checkBTState();
- btnOn.setOnClickListener(new OnClickListener() {
- public void onClick(View v) {
- sendData("1");
- Toast.makeText(getBaseContext(), "Turn on LED", Toast.LENGTH_SHORT).show();
- }
- });
- btnOff.setOnClickListener(new OnClickListener() {
- public void onClick(View v) {
- sendData("0");
- Toast.makeText(getBaseContext(), "Turn off LED", Toast.LENGTH_SHORT).show();
- }
- });
- }
- private BluetoothSocket createBluetoothSocket(BluetoothDevice device) throws IOException {
- if(Build.VERSION.SDK_INT >= 10){
- try {
- final Method m = device.getClass().getMethod("createInsecureRfcommSocketToServiceRecord", new Class[] { UUID.class });
- return (BluetoothSocket) m.invoke(device, MY_UUID);
- } catch (Exception e) {
- Log.e(TAG, "Could not create Insecure RFComm Connection",e);
- }
- }
- return device.createRfcommSocketToServiceRecord(MY_UUID);
- }
- @Override
- public void onResume() {
- super.onResume();
- Log.d(TAG, "...onResume - try connect...");
- // Set up a pointer to the remote node using it's address.
- BluetoothDevice device = btAdapter.getRemoteDevice(address);
- // Two things are needed to make a connection:
- // A MAC address, which we got above.
- // A Service ID or UUID. In this case we are using the
- // UUID for SPP.
- try {
- btSocket = createBluetoothSocket(device);
- } catch (IOException e1) {
- errorExit("Fatal Error", "In onResume() and socket create failed: " + e1.getMessage() + ".");
- }
- // Discovery is resource intensive. Make sure it isn't going on
- // when you attempt to connect and pass your message.
- btAdapter.cancelDiscovery();
- // Establish the connection. This will block until it connects.
- Log.d(TAG, "...Connecting...");
- try {
- btSocket.connect();
- Log.d(TAG, "...Connection ok...");
- } catch (IOException e) {
- try {
- btSocket.close();
- } catch (IOException e2) {
- errorExit("Fatal Error", "In onResume() and unable to close socket during connection failure" + e2.getMessage() + ".");
- }
- }
- // Create a data stream so we can talk to server.
- Log.d(TAG, "...Create Socket...");
- try {
- outStream = btSocket.getOutputStream();
- } catch (IOException e) {
- errorExit("Fatal Error", "In onResume() and output stream creation failed:" + e.getMessage() + ".");
- }
- }
- @Override
- public void onPause() {
- super.onPause();
- Log.d(TAG, "...In onPause()...");
- if (outStream != null) {
- try {
- outStream.flush();
- } catch (IOException e) {
- errorExit("Fatal Error", "In onPause() and failed to flush output stream: " + e.getMessage() + ".");
- }
- }
- try {
- btSocket.close();
- } catch (IOException e2) {
- errorExit("Fatal Error", "In onPause() and failed to close socket." + e2.getMessage() + ".");
- }
- }
- private void checkBTState() {
- // Check for Bluetooth support and then check to make sure it is turned on
- // Emulator doesn't support Bluetooth and will return null
- if(btAdapter==null) {
- errorExit("Fatal Error", "Bluetooth not support");
- } else {
- if (btAdapter.isEnabled()) {
- Log.d(TAG, "...Bluetooth ON...");
- } else {
- //Prompt user to turn on Bluetooth
- Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
- startActivityForResult(enableBtIntent, 1);
- }
- }
- }
- private void errorExit(String title, String message){
- Toast.makeText(getBaseContext(), title + " - " + message, Toast.LENGTH_LONG).show();
- finish();
- }
- private void sendData(String message) {
- byte[] msgBuffer = message.getBytes();
- Log.d(TAG, "...Send data: " + message + "...");
- try {
- outStream.write(msgBuffer);
- } catch (IOException e) {
- String msg = "In onResume() and an exception occurred during write: " + e.getMessage();
- if (address.equals("00:00:00:00:00:00"))
- msg = msg + ".\n\nUpdate your server address from 00:00:00:00:00:00 to the correct address on line 35 in the java code";
- msg = msg + ".\n\nCheck that the SPP UUID: " + MY_UUID.toString() + " exists on server.\n\n";
- errorExit("Fatal Error", msg);
- }
- }
- }
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