Develop Reference

Exchanging String between devices over Bluetooth

I am beginner and making my first project on android studio. I want to exchange a unique string between devices over Bluetooth without pairing whenever devices are near. Following is the code I tried but did not work. The code I mention is of scanning part only when click on scan it search for the device and exchange the keys but it is not working.
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ON = (Button) findViewById(R.id.button3);
OFF = (Button) findViewById(R.id.button5);
Scan = (Button) findViewById(R.id.search);
myBT = BluetoothAdapter.getDefaultAdapter();
Interaction = (Button) findViewById(R.id.intr);
intentON = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
other = (TextView)findViewById(R.id.textView4);
bluelist = (ListView) findViewById(R.id.btList);
//IntView = (ListView) findViewById(R.id.InList);
arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1);
pAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1);
bluelist.setAdapter(arrayAdapter);
random = UUID.randomUUID();
getUUID = random.toString();
code = (TextView) findViewById(R.id.textView6);
data = getIntent().getExtras().getString("SomeNumbers");
code.setText(data);
send = (String) code.getText();
checkPermission();
ON.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(myBT.isEnabled())
Toast.makeText(getApplicationContext(), "Bluetooth already Enabled", Toast.LENGTH_SHORT).show();
else
bluetoothOn();
}
});
OFF.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
bluetoothOff();
}
});
Scan.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
discover();
}
});
bluelist.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//pairDevice(device);
}
});
Interaction.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent getInteractions = new Intent(MainActivity.this, Interactions.class);
//Bundle args = new Bundle();
//args.putSerializable("Exposure", (Serializable)arrayList);
getInteractions.putStringArrayListExtra("Exposure", arrayList);
startActivity(getInteractions);
}
});
}
#Override
protected void onActivityResult(int requestCode, int resultCode, #Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == BLUETOOTH_REQ_CODE) {
if (resultCode == RESULT_OK) {
Toast.makeText(getApplicationContext(), "Bluetooth is Enabled", Toast.LENGTH_LONG).show();
} else if (resultCode == RESULT_CANCELED) {
Toast.makeText(getApplicationContext(), "Bluetooth Disabled", Toast.LENGTH_LONG).show();
}
}
}
private void discover(){
if(myBT.isDiscovering()){
myBT.cancelDiscovery();
Toast.makeText(getApplicationContext(),"Discovery stopped",Toast.LENGTH_SHORT).show();
}
else{
if(myBT.isEnabled()) {
arrayAdapter.clear(); // clear items
myBT.startDiscovery();
Toast.makeText(getApplicationContext(), "Discovery started", Toast.LENGTH_SHORT).show();
registerReceiver(receiver, new IntentFilter(BluetoothDevice.ACTION_FOUND));
}
else{
bluetoothOn();
}
}
}
private final BroadcastReceiver receiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if(BluetoothDevice.ACTION_FOUND.equals(action)){
device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
// add the name to the list
arrayAdapter.add(device.getName() + "\n" + device.getAddress());
arrayAdapter.notifyDataSetChanged();
ServerClass serverClass = new ServerClass();
serverClass.start();
ClientClass clientClass = new ClientClass(pairing);
clientClass.start();
sendReceive.write(send.getBytes());
}
}
};
Handler handler = new Handler(new Handler.Callback() {
#Override
public boolean handleMessage(#NonNull Message msg) {
switch(msg.what)
{
case STATE_LISTENING:
Toast.makeText(getApplicationContext(), "Listening", Toast.LENGTH_SHORT).show();
break;
case STATE_CONNECTING:
Toast.makeText(getApplicationContext(), "Connecting", Toast.LENGTH_SHORT).show();
break;
case STATE_CONNECTED:
Toast.makeText(getApplicationContext(), "Connected", Toast.LENGTH_SHORT).show();
break;
case STATE_CONNECTION_FAILED:
Toast.makeText(getApplicationContext(), "Connection Failed", Toast.LENGTH_SHORT).show();
break;
case STATE_MESSAGE_RECEIVED:
byte[] readBuff = (byte[]) msg.obj ;
String tempMsg = new String(readBuff,0,msg.arg1);
other.setText(tempMsg);
break;
}
return false;
}
});
private class ServerClass extends Thread
{
private BluetoothServerSocket serverSocket;
public ServerClass()
{
try {
serverSocket = myBT.listenUsingInsecureRfcommWithServiceRecord(App_Name,random);
} catch (IOException e) {
e.printStackTrace();
}
}
public void run()
{
BluetoothSocket socket=null;
while(socket == null)
{
try {
//Message msg = Message.obtain();
//msg.what=
//handler.sendMessage(msg);
socket=serverSocket.accept();
} catch (IOException e) {
e.printStackTrace();
//Message msg = Message.obtain();
//msg.what=
//handler.sendMessage(msg);
}
if(socket != null)
{
//Message msg = Message.obtain();
//msg.what=
//handler.sendMessage(msg);
sendReceive = new SendReceive(socket);
sendReceive.start();
break;
}
}
}
}
private class ClientClass extends Thread
{
private BluetoothDevice device;
private BluetoothSocket socket;
public ClientClass(BluetoothDevice device1)
{
device=device1;
try {
socket = device.createRfcommSocketToServiceRecord(random);
} catch (IOException e) {
e.printStackTrace();
}
}
public void run()
{
try {
socket.connect();
sendReceive = new SendReceive(socket);
sendReceive.start();
} catch (IOException e) {
e.printStackTrace();
}
}
}
private class SendReceive extends Thread
{
private final BluetoothSocket bluetoothSocket;
private final InputStream inputStream;
private final OutputStream outputStream;
public SendReceive(BluetoothSocket socket)
{
bluetoothSocket=socket;
InputStream tempIn = null;
OutputStream tempOut = null;
try {
tempIn = bluetoothSocket.getInputStream();
tempOut = bluetoothSocket.getOutputStream();
} catch (IOException e) {
e.printStackTrace();
}
inputStream = tempIn;
outputStream = tempOut;
}
public void run()
{
byte[] buffer = new byte[1024];
int bytes;
while(true)
{
try {
bytes = inputStream.read(buffer);
handler.obtainMessage(STATE_MESSAGE_RECEIVED,bytes,-1,buffer).sendToTarget();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public void write(byte[] bytes)
{
try {
outputStream.write(bytes);
} catch (IOException e) {
e.printStackTrace();
}
}
}

bluetooth as service and send/receive from it

I'm trying to recieve/send data to arduino board using bluetooth, and I can connect to board from one activity. I know that I can make my other activities connect with bluetooth using service but I don't know how to make bluetooth as service. and i don't know how to send and recieve from it.
my Paired Devices code:
public class BTConnect extends AppCompatActivity {
private static final String TAG = "BTConnect";
ListView IdLista;
public static String EXTRA_DEVICE_ADDRESS = "device_address";
private BluetoothAdapter mBtAdapter;
private ArrayAdapter<String> mPairedDevicesArrayAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_btconnect);
}
#Override
public void onResume()
{
super.onResume();
//---------------------------------
VerificarEstadoBT();
//
mPairedDevicesArrayAdapter = new ArrayAdapter<String>(this, R.layout.btconnect_nombre);
IdLista = (ListView)findViewById(R.id.Id2);
IdLista.setAdapter(mPairedDevicesArrayAdapter);
IdLista.setOnItemClickListener(mDeviceClickListener);
mBtAdapter = BluetoothAdapter.getDefaultAdapter();
Set<BluetoothDevice> pairedDevices = mBtAdapter.getBondedDevices();
if (pairedDevices.size() > 0)
{
for (BluetoothDevice device: pairedDevices) {
mPairedDevicesArrayAdapter.add(device.getName() + "\n" + device.getAddress());
}
}
}
private AdapterView.OnItemClickListener mDeviceClickListener = new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView av, View v, int arg2, long arg3) {
String info = ((TextView) v).getText().toString();
String address = info.substring(info.length() - 17);
Intent i = new Intent(BTConnect.this, device.class);
i.putExtra(EXTRA_DEVICE_ADDRESS, address);
startActivity(i);
}
};
private void VerificarEstadoBT() {
mBtAdapter= BluetoothAdapter.getDefaultAdapter();
if(mBtAdapter==null) {
Toast.makeText(getBaseContext(), "the device can't connect to BT", Toast.LENGTH_SHORT).show();
} else {
if (mBtAdapter.isEnabled()) {
Log.d(TAG, "...Bluetooth Activation...");
} else {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, 1);
}
}
}}
And my first activity 'device' :
public class device extends AppCompatActivity {
Button IdEncender, IdApagar,IdDesconectar,IdReset;
ArrayList<String> addArray = new ArrayList<String>();
ListView show;
//-------------------------------------------
Handler bluetoothIn;
final int handlerState = 0;
private BluetoothAdapter btAdapter = null;
private BluetoothSocket btSocket = null;
private StringBuilder DataStringIN = new StringBuilder();
private ConnectedThread MyConexionBT;
// Identificador unico de servicio - SPP UUID
private static final UUID BTMODULEUUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
// String para la direccion MAC
private static String address = null;
//-------------------------------------------
#SuppressLint("HandlerLeak")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_device);
IdEncender = (Button) findViewById(R.id.IdEncender);
IdApagar = (Button) findViewById(R.id.IdApagar);
IdDesconectar = (Button) findViewById(R.id.IdDisconectar);
show = (ListView) findViewById(R.id.LIST1) ;
IdReset=(Button)findViewById(R.id.IdReset);
bluetoothIn = new Handler() {
public void handleMessage(android.os.Message msg) {
if (msg.what == handlerState) {
String readMessage = (String) msg.obj;
DataStringIN.append(readMessage);
int endOfLineIndex = DataStringIN.indexOf("#");
if (endOfLineIndex > 0) {
String dataInPrint = DataStringIN.substring(0, endOfLineIndex);
String newline = "\r\n";
DataStringIN.delete(0, DataStringIN.length());
//--List adapter--//
addArray.add(dataInPrint);
ArrayAdapter<String> adapter =new ArrayAdapter<String>(device.this, android.R.layout.simple_list_item_1, addArray);
show.setAdapter(adapter);
}
}
};
btAdapter = BluetoothAdapter.getDefaultAdapter(); // get Bluetooth adapter
VerificarEstadoBT();
IdEncender.setOnClickListener(new View.OnClickListener() {
public void onClick(View v)
{
MyConexionBT.write("1");
}
});
IdApagar.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
MyConexionBT.write("0");
}
});
IdDesconectar.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (btSocket!=null)
{
try {btSocket.close();}
catch (IOException e)
{ Toast.makeText(getBaseContext(), "Error", Toast.LENGTH_SHORT).show();;}
}
finish();
}
});
configurebutton();
}
private void configurebutton() {
Button startbutton = (Button)findViewById(R.id.Start);
startbutton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
startActivity(new Intent(device.this,chart.class));
}
});
}
private BluetoothSocket createBluetoothSocket(BluetoothDevice device) throws IOException
{
return device.createRfcommSocketToServiceRecord(BTMODULEUUID);
}
#Override
public void onResume()
{
super.onResume();
Intent intent = getIntent();
address = intent.getStringExtra(BTConnect.EXTRA_DEVICE_ADDRESS);
BluetoothDevice device = btAdapter.getRemoteDevice(address);
try
{
btSocket = createBluetoothSocket(device);
} catch (IOException e) {
Toast.makeText(getBaseContext(), "fail", Toast.LENGTH_LONG).show();
}
try
{
btSocket.connect();
} catch (IOException e) {
try {
btSocket.close();
} catch (IOException e2) {}
}
MyConexionBT = new ConnectedThread(btSocket);
MyConexionBT.start();
}
#Override
public void onPause()
{
super.onPause();
try
{
btSocket.close();
} catch (IOException e2) {}
}
private void VerificarEstadoBT() {
if(btAdapter==null) {
Toast.makeText(getBaseContext(), "error in bluetooth connection", Toast.LENGTH_LONG).show();
} else {
if (btAdapter.isEnabled()) {
} else {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, 1);
}
}
}
public void savefile(String file, String text){
try {
FileOutputStream fos = openFileOutput(file, Context.MODE_APPEND);
fos.write(text.getBytes());
fos.close();
Toast.makeText(device.this, "saved!", Toast.LENGTH_LONG).show();
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(device.this,"error",Toast.LENGTH_LONG).show();
}
}
//Crea la clase que permite crear el evento de conexion
private class ConnectedThread extends Thread
{
private final InputStream mmInStream;
private final OutputStream mmOutStream;
public ConnectedThread(BluetoothSocket socket)
{
InputStream tmpIn = null;
OutputStream tmpOut = null;
try
{
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e) { }
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run()
{
byte[] buffer = new byte[256];
int bytes;
while (true) {
try {
bytes = mmInStream.read(buffer);
String readMessage = new String(buffer, 0, bytes);
bluetoothIn.obtainMessage(handlerState, bytes, -1, readMessage).sendToTarget();
} catch (IOException e) {
break;
}
}
}
public void write(String input)
{
try {
mmOutStream.write(input.getBytes());
}
catch (IOException e)
{
Toast.makeText(getBaseContext(), "fail to connect", Toast.LENGTH_LONG).show();
finish();
}
}
}
}

If shortly move your connection/message_exchange logic to Thread/Runnable and start it from Service. You can exchange data between Service and Activity/Activities with BroadcastReceivers or Messenger. I also recommend you to use Bluetooth lib:
implementation 'me.aflak.libraries:bluetooth:1.3.4' this one already have inside thread so it is become easy to embed in your service.
Example code of service which use this lib and Messenger:
private ArrayList<Messenger> mClients = new ArrayList<>();
final private Messenger inComingMessenger = new Messenger(mIncomingHandler);
#SuppressLint("HandlerLeak")
final Handler mIncomingHandler = new Handler() {
#Override
public void handleMessage(Message msg) {
switch (msg.what) {
case Constants.MSG_REGISTER_CLIENT:
mClients.add(msg.replyTo);
Log.d(TAG, "handleMessage: new client connected. Total: " + mClients.size());
break;
case Constants.MSG_UNREGISTER_CLIENT:
mClients.remove(msg.replyTo);
Log.d(TAG, "handleMessage: client disconnected. Total: " + mClients.size());
break;
case Constants.MSG_YOUR_MESSAGE_TYPE:
String val = (String) msg.obj;
// stuff to do
break;
}
}
};
/**
* Send message to connected activities
*/
public void sendMessageToClients(int msgSignal, Object obj) {
if (mClients.size() == 0)
return;
sendMessage(mClients.get(0), Message.obtain(null, msgSignal, obj));
for (int i = 1; i < mClients.size(); i++) {
if (mClients.get(i) == null)
continue;
sendMessage(mClients.get(i), Message.obtain(null, msgSignal, obj));
}
}
/**
* Send message to binded activity
*/
private void sendMessage(Messenger msgr, Message msg) {
try {
msgr.send((msg));
} catch (RemoteException e) {
Log.e(TAG, "can't send message", e);
e.printStackTrace();
}
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
super.onStartCommand(intent, flags, startId);
Log.d(TAG, "onStartCommand");
return START_STICKY;
}
#Nullable
#Override
public IBinder onBind(Intent intent) {
Log.d(TAG, "onBind");
return inComingMessenger.getBinder();
}
#Override
public void onCreate() {
super.onCreate();
bleDevices = new ArrayList<>();
if(bluetooth == null) {
bluetooth = new Bluetooth(this);
bluetooth.setBluetoothCallback(new BluetoothCallback() {
#Override
public void onBluetoothTurningOn() {}
#Override
public void onBluetoothOn() {}
#Override
public void onBluetoothTurningOff() {
bluetooth = null;
}
#Override
public void onBluetoothOff() { }
#Override
public void onUserDeniedActivation() {
// when using bluetooth.showEnableDialog()
// you will also have to call bluetooth.onActivityResult()
}
});
bluetooth.setDiscoveryCallback(new DiscoveryCallback() {
#Override public void onDiscoveryStarted() {
}
#Override public void onDiscoveryFinished() {
bleDevices.clear();
}
#Override public void onDeviceFound(BluetoothDevice device) {
if(bleDevices.indexOf(device)<0) {
bleDevices.add(device);
Log.d(TAG, "Found new device while scanning: "+device.getAddress());
sendMessageToClients(Constants.MSG_BLE_DEVICE_FOUND, device);
}
}
#Override public void onDevicePaired(BluetoothDevice device) {}
#Override public void onDeviceUnpaired(BluetoothDevice device) {}
#Override public void onError(String message) {
Log.e(TAG, "DiscoveryCallback onError "+message);
}
});
bluetooth.setDeviceCallback(new DeviceCallback() {
#Override public void onDeviceConnected(BluetoothDevice device) { }
#Override public void onDeviceDisconnected(BluetoothDevice device, String message) { }
#Override public void onMessage(String message) {
// Handle your message
yourHandleFunction(message.replaceAll(" ",""));
Log.d(TAG, message);
}
#Override public void onError(String message) {
Log.e(TAG, "DeviceCallback onError "+message);
}
#Override public void onConnectError(BluetoothDevice device, String message) { }
});
bluetooth.onStart();
}
connectToSavedDevice();
}
}
private void connectToSavedDevice() {
Log.d(TAG, "connectToSavedDevice state="+getState());
if(getState() != STATE_DISCONNECTED) return;
SharedPreferences pref = getSharedPreferences(App.TAG, 0);
String address = pref.getString(Constants.PREF_AUTO_CONNECT_TO_ADDRESS, null);
if(address == null) {
Log.d(TAG, "saved address==null start scan for devices");
scanDevices();
return;
}
BluetoothDevice device = bluetoothAdapter.getRemoteDevice(address);
if(device!=null) {
Log.d(TAG, "device found try to connect/bound, connect to Arduino");
bluetooth.connectToAddress(address,false);
}
}
In activity implement ServiceConnection interface:
protected synchronized void unbindService() {
if (!isBound()) {
return;
}
// lock object (prevents access to service while disconnecting)
synchronized (outComingMessenger) {
sendMessageToService(Message.obtain(null, Constants.MSG_UNREGISTER_CLIENT));
unbindService(this);
outComingMessenger = null;
}
}
protected void bindService() {
bindService(mServiceIntent, this, BIND_AUTO_CREATE);
}
#Override
public void onServiceConnected(ComponentName name, IBinder service) {
outComingMessenger = new Messenger(service);
final Message msg = Message.obtain(null, Constants.MSG_REGISTER_CLIENT);
msg.replyTo = inComingMessenger;
msg.obj = getClass().getSimpleName();
sendMessageToService(msg);
sendMessageToService(Constants.MSG_CHECK_IS_CONNECTION_READY);
}
#Override
public void onServiceDisconnected(ComponentName name) {
outComingMessenger = null;
bindService();
}
/**
* Send message to service
*/
protected void sendMessageToService(Message msg) {
if (!isBound()) {
return;
}
try {
msg.replyTo = inComingMessenger;
outComingMessenger.send(msg);
} catch (RemoteException e) {
}
}
/**
* Send simple message to connected service
* #param messageId
*/
protected void sendMessageToService(int messageId) {
sendMessageToService(Message.obtain(null, messageId));
}
/**
* Send simple message to connected service
* #param messageId
*/
protected void sendMessageToService(int messageId, Object obj) {
sendMessageToService(Message.obtain(null, messageId, obj));
}
/**
* Service is connected?
*/
protected final boolean isBound() {
return outComingMessenger != null;
}
#SuppressLint("HandlerLeak")
private final Handler mIncomingHandler = new Handler() {
public void handleMessage(Message msg) {
switch (msg.what) {
case Constants.MSG_YOUR_MESSAGE:
int res = (int) msg.obj;
break;
case Constants.MSG_CONNECTION_READY:
isReady = (boolean) msg.obj;
if(isReady) {
// show toast or what you want to do with the UI
} else {
// do something else
}
break;
case Constants.MSG_BLE_DEVICE_FOUND:
BluetoothDevice device = (BluetoothDevice)msg.obj;
SharedPreferences pref = getSharedPreferences(App.TAG, 0);
String deviceAddress = pref.getString(Constants.PREF_AUTO_CONNECT_TO_ADDRESS, null);
break;
}
}
};
final private Messenger inComingMessenger = new Messenger(mIncomingHandler);

Bluetooth Connection

I've looked at quite a lot of topics on this in different forums and none seem to help me.
I recently bought an Elegoo car kit, which is compatible with the Arduino IDE, and it comes with different types of code and what not. they even have their own Android app.
My problem is I want to create my own android Bluetooth application that connects/pairs with the module and can control the car remotely. I have my application up and running, it can scan for nearby devices and the HC-08 module appears in the list but I am not able to connect. when I try to connect it says it can't communicate with HC-08. I am pretty sure the problem lies in the android end as the elegoo Bluetooth app connects no problem at all with the Bluetooth module if there is any code on the elegoo board or not. The bluetooth module is a HC-08.
Can someone help me with this ?
Also I am following this youtube tutorial so the credit goes to him for the code.
https://www.youtube.com/watch?v=YJ0JQXcNNTA
Here is the main activity code:
public class MainActivity extends AppCompatActivity implements
AdapterView.OnItemClickListener{
private static final String TAG = "MainActivity";
BluetoothAdapter mBluetoothAdapter;
Button btnEnableDisable_Discoverable;
public ArrayList<BluetoothDevice> mBTDevices = new ArrayList<>();
public DeviceListAdapter mDeviceListAdapter;
ListView lvNewDevices;
// Create a BroadcastReceiver for ACTION_FOUND
private final BroadcastReceiver mBroadcastReceiver1 = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
// When discovery finds a device
if (action.equals(mBluetoothAdapter.ACTION_STATE_CHANGED)) {
final int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, mBluetoothAdapter.ERROR);
switch(state){
case BluetoothAdapter.STATE_OFF:
Log.d(TAG, "onReceive: STATE OFF");
break;
case BluetoothAdapter.STATE_TURNING_OFF:
Log.d(TAG, "mBroadcastReceiver1: STATE TURNING OFF");
break;
case BluetoothAdapter.STATE_ON:
Log.d(TAG, "mBroadcastReceiver1: STATE ON");
break;
case BluetoothAdapter.STATE_TURNING_ON:
Log.d(TAG, "mBroadcastReceiver1: STATE TURNING ON");
break;
}
}
}
};
/**
* Broadcast Receiver for changes made to bluetooth states such as:
* 1) Discoverability mode on/off or expire.
*/
private final BroadcastReceiver mBroadcastReceiver2 = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
if (action.equals(BluetoothAdapter.ACTION_SCAN_MODE_CHANGED)) {
int mode = intent.getIntExtra(BluetoothAdapter.EXTRA_SCAN_MODE, BluetoothAdapter.ERROR);
switch (mode) {
//Device is in Discoverable Mode
case BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE:
Log.d(TAG, "mBroadcastReceiver2: Discoverability Enabled.");
break;
//Device not in discoverable mode
case BluetoothAdapter.SCAN_MODE_CONNECTABLE:
Log.d(TAG, "mBroadcastReceiver2: Discoverability Disabled. Able to receive connections.");
break;
case BluetoothAdapter.SCAN_MODE_NONE:
Log.d(TAG, "mBroadcastReceiver2: Discoverability Disabled. Not able to receive connections.");
break;
case BluetoothAdapter.STATE_CONNECTING:
Log.d(TAG, "mBroadcastReceiver2: Connecting....");
break;
case BluetoothAdapter.STATE_CONNECTED:
Log.d(TAG, "mBroadcastReceiver2: Connected.");
break;
}
}
}
};
/**
* Broadcast Receiver for listing devices that are not yet paired
* -Executed by btnDiscover() method.
*/
private BroadcastReceiver mBroadcastReceiver3 = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
Log.d(TAG, "onReceive: ACTION FOUND.");
if (action.equals(BluetoothDevice.ACTION_FOUND)){
BluetoothDevice device = intent.getParcelableExtra (BluetoothDevice.EXTRA_DEVICE);
mBTDevices.add(device);
Log.d(TAG, "onReceive: " + device.getName() + ": " + device.getAddress());
mDeviceListAdapter = new DeviceListAdapter(context, R.layout.device_adapter_view, mBTDevices);
lvNewDevices.setAdapter(mDeviceListAdapter);
}
}
};
/**
* Broadcast Receiver that detects bond state changes (Pairing status changes)
*/
private final BroadcastReceiver mBroadcastReceiver4 = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
if(action.equals(BluetoothDevice.ACTION_BOND_STATE_CHANGED)){
BluetoothDevice mDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
//3 cases:
//case1: bonded already
if (mDevice.getBondState() == BluetoothDevice.BOND_BONDED){
Log.d(TAG, "BroadcastReceiver: BOND_BONDED.");
}
//case2: creating a bone
if (mDevice.getBondState() == BluetoothDevice.BOND_BONDING) {
Log.d(TAG, "BroadcastReceiver: BOND_BONDING.");
}
//case3: breaking a bond
if (mDevice.getBondState() == BluetoothDevice.BOND_NONE) {
Log.d(TAG, "BroadcastReceiver: BOND_NONE.");
}
}
}
};
#Override
protected void onDestroy() {
Log.d(TAG, "onDestroy: called.");
super.onDestroy();
unregisterReceiver(mBroadcastReceiver1);
unregisterReceiver(mBroadcastReceiver2);
unregisterReceiver(mBroadcastReceiver3);
unregisterReceiver(mBroadcastReceiver4);
//mBluetoothAdapter.cancelDiscovery();
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btnONOFF = (Button) findViewById(R.id.btnONOFF);
btnEnableDisable_Discoverable = (Button) findViewById(R.id.btnDiscoverable_on_off);
lvNewDevices = (ListView) findViewById(R.id.lvNewDevices);
mBTDevices = new ArrayList<>();
//Broadcasts when bond state changes (ie:pairing)
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
registerReceiver(mBroadcastReceiver4, filter);
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
lvNewDevices.setOnItemClickListener(MainActivity.this);
btnONOFF.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Log.d(TAG, "onClick: enabling/disabling bluetooth.");
enableDisableBT();
}
});
}
public void enableDisableBT(){
if(mBluetoothAdapter == null){
Log.d(TAG, "enableDisableBT: Does not have BT capabilities.");
}
if(!mBluetoothAdapter.isEnabled()){
Log.d(TAG, "enableDisableBT: enabling BT.");
Intent enableBTIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivity(enableBTIntent);
IntentFilter BTIntent = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
registerReceiver(mBroadcastReceiver1, BTIntent);
}
if(mBluetoothAdapter.isEnabled()){
Log.d(TAG, "enableDisableBT: disabling BT.");
mBluetoothAdapter.disable();
IntentFilter BTIntent = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
registerReceiver(mBroadcastReceiver1, BTIntent);
}
}
public void btnEnableDisable_Discoverable(View view) {
Log.d(TAG, "btnEnableDisable_Discoverable: Making device discoverable for 300 seconds.");
Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
startActivity(discoverableIntent);
IntentFilter intentFilter = new IntentFilter(mBluetoothAdapter.ACTION_SCAN_MODE_CHANGED);
registerReceiver(mBroadcastReceiver2,intentFilter);
}
public void btnDiscover(View view) {
Log.d(TAG, "btnDiscover: Looking for unpaired devices.");
if(mBluetoothAdapter.isDiscovering()){
mBluetoothAdapter.cancelDiscovery();
Log.d(TAG, "btnDiscover: Canceling discovery.");
//check BT permissions in manifest
checkBTPermissions();
mBluetoothAdapter.startDiscovery();
IntentFilter discoverDevicesIntent = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(mBroadcastReceiver3, discoverDevicesIntent);
}
if(!mBluetoothAdapter.isDiscovering()){
//check BT permissions in manifest
checkBTPermissions();
mBluetoothAdapter.startDiscovery();
IntentFilter discoverDevicesIntent = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(mBroadcastReceiver3, discoverDevicesIntent);
}
}
/**
* This method is required for all devices running API23+
* Android must programmatically check the permissions for bluetooth. Putting the proper permissions
* in the manifest is not enough.
*
* NOTE: This will only execute on versions > LOLLIPOP because it is not needed otherwise.
*/
private void checkBTPermissions() {
if(Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP){
int permissionCheck = this.checkSelfPermission("Manifest.permission.ACCESS_FINE_LOCATION");
permissionCheck += this.checkSelfPermission("Manifest.permission.ACCESS_COARSE_LOCATION");
if (permissionCheck != 0) {
this.requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION}, 1001); //Any number
}
}else{
Log.d(TAG, "checkBTPermissions: No need to check permissions. SDK version < LOLLIPOP.");
}
}
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
//first cancel discovery because its very memory intensive.
mBluetoothAdapter.cancelDiscovery();
Log.d(TAG, "onItemClick: You Clicked on a device.");
String deviceName = mBTDevices.get(i).getName();
String deviceAddress = mBTDevices.get(i).getAddress();
Log.d(TAG, "onItemClick: deviceName = " + deviceName);
Log.d(TAG, "onItemClick: deviceAddress = " + deviceAddress);
//create the bond.
//NOTE: Requires API 17+? I think this is JellyBean
if(Build.VERSION.SDK_INT > Build.VERSION_CODES.JELLY_BEAN_MR2){
Log.d(TAG, "Trying to pair with " + deviceName);
mBTDevices.get(i).createBond();
}
}
}
/// Here is also my DeviceListAdapter code:
public class DeviceListAdapter extends ArrayAdapter<BluetoothDevice> {
private LayoutInflater mLayoutInflater;
private ArrayList<BluetoothDevice> mDevices;
private int mViewResourceId;
public DeviceListAdapter(Context context, int tvResourceId, ArrayList<BluetoothDevice> devices){
super(context, tvResourceId,devices);
this.mDevices = devices;
mLayoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mViewResourceId = tvResourceId;
}
public View getView(int position, View convertView, ViewGroup parent) {
convertView = mLayoutInflater.inflate(mViewResourceId, null);
BluetoothDevice device = mDevices.get(position);
if (device != null) {
TextView deviceName = (TextView) convertView.findViewById(R.id.tvDeviceName);
TextView deviceAdress = (TextView) convertView.findViewById(R.id.tvDeviceAddress);
if (deviceName != null) {
deviceName.setText(device.getName());
}
if (deviceAdress != null) {
deviceAdress.setText(device.getAddress());
}
}
return convertView;
}
}

Some of the tutorials on Bluetooth are pretty old! I just got Arduino-Android Bluetooth communication working last week so this should work for you! First in your manifest file add these permissions:
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
Then use this in your main.
public class MainActivity extends AppCompatActivity {
private final String DEVICE_ADDRESS="benamekhoda"; //I actually used Device Name instead of address
private final UUID PORT_UUID = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb"); //Serial Port Service UUID
private BluetoothDevice device; //Our Bluetooth Device
private BluetoothSocket socket;
private OutputStream outputStream;
private InputStream inputStream;
Button startButton, sendButton,clearButton,stopButton;
TextView textView;
EditText editText;
boolean deviceConnected=false;
Thread thread;
byte buffer[];
int bufferPosition;
boolean stopThread;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
editText = (EditText) findViewById(R.id.edittext);
textView = (TextView) findViewById(R.id.textview);
startButton = (Button) findViewById(R.id.buttonStart);
startButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if(BTinit())
{
if(BTconnect())
{
setUiEnabled(true);
deviceConnected=true;
beginListenForData();
textView.append("\nConnection Opened!\n");
}
else{
Toast.makeText(getApplicationContext(),"BTconnect false",Toast.LENGTH_SHORT).show();
}
}
else{
Toast.makeText(getApplicationContext(),"BTinit false",Toast.LENGTH_SHORT).show();
}
}
});
sendButton = (Button) findViewById(R.id.buttonSend);
sendButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String string = editText.getText().toString();
string.concat("\n");
try {
outputStream.write(string.getBytes());
} catch (IOException e) {
e.printStackTrace();
}
textView.append("\nSent Data:"+string+"\n");
}
});
clearButton = (Button) findViewById(R.id.buttonClear);
clearButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
onClickClear(view);
}
});
stopButton = (Button) findViewById(R.id.buttonStop);
stopButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
onClickSend(view);
}
});
setUiEnabled(false);
}
public void setUiEnabled(boolean bool)
{
startButton.setEnabled(!bool);
sendButton.setEnabled(bool);
stopButton.setEnabled(bool);
textView.setEnabled(bool);
}
public boolean BTinit()
{
boolean found=false;
BluetoothAdapter bluetoothAdapter=BluetoothAdapter.getDefaultAdapter();
if (bluetoothAdapter == null) {
Toast.makeText(getApplicationContext(),"Device doesnt Support Bluetooth",Toast.LENGTH_SHORT).show();
}
if(!bluetoothAdapter.isEnabled())
{
Intent enableAdapter = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableAdapter, 0);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
Set<BluetoothDevice> bondedDevices = bluetoothAdapter.getBondedDevices(); //Something like ArrayList but no duplicate is allowed and data is unordered
if(bondedDevices.isEmpty())
{
Toast.makeText(getApplicationContext(),"Please Pair the Device first",Toast.LENGTH_SHORT).show();
}
else
{
for (BluetoothDevice iterator : bondedDevices)
{
if(iterator.getName().equals(DEVICE_ADDRESS))
{
device=iterator;
Toast.makeText(getApplicationContext(),"found the device",Toast.LENGTH_SHORT).show();
found=true;
break;
}
}
}
return found;
}
public boolean BTconnect()
{
boolean connected=true;
try {
socket = device.createRfcommSocketToServiceRecord(PORT_UUID);
socket.connect();
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(getApplicationContext(),"throw1",Toast.LENGTH_SHORT).show();
connected=false;
}
if(connected)
{
try {
outputStream=socket.getOutputStream();
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(getApplicationContext(),"throw2",Toast.LENGTH_SHORT).show();
}
try {
inputStream=socket.getInputStream();
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(getApplicationContext(),"throw3",Toast.LENGTH_SHORT).show();
}
}
return connected;
}
void beginListenForData()
{
final Handler handler = new Handler();
stopThread = false;
buffer = new byte[1024];
Thread thread = new Thread(new Runnable()
{
public void run()
{
while(!Thread.currentThread().isInterrupted() && !stopThread)
{
try
{
int byteCount = inputStream.available();
if(byteCount > 0)
{
byte[] rawBytes = new byte[byteCount];
inputStream.read(rawBytes);
final String string=new String(rawBytes,"UTF-8");
handler.post(new Runnable() {
public void run()
{
textView.append(string);
}
});
}
}
catch (IOException ex)
{
stopThread = true;
Toast.makeText(getApplicationContext(),"throw4",Toast.LENGTH_SHORT).show();
}
}
}
});
thread.start();
}
public void onClickSend(View view) {
String string = editText.getText().toString();
string.concat("\n");
try {
outputStream.write(string.getBytes());
} catch (IOException e) {
e.printStackTrace();
}
textView.append("\nSent Data:"+string+"\n");
}
public void onClickStop(View view) throws IOException {
stopThread = true;
outputStream.close();
inputStream.close();
socket.close();
setUiEnabled(false);
deviceConnected=false;
textView.append("\nConnection Closed!\n");
}
public void onClickClear(View view) {
textView.setText("");
}
}
I got it from this awesome tutorial by Hariharan Mathavan from All About Circuits.

connecting paired devices in Bluetooth using android studio

I have created an app to display paired devices successfully but not able to connect to it.
I tried a lot but i'm getting "app has been stopped working".
Please advise on issues in my code to connect to paired devices:
public class MainActivity extends AppCompatActivity {
public static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
BluetoothAdapter bt;
ArrayAdapter<String> listAdapter;
Set<BluetoothDevice> devicesArray;
ListView listview;
Button connectbutton;
Handler mHandler = new Handler(){
#Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
super.handleMessage(msg);
Toast.makeText(getApplicationContext(), "CONNECT", Toast.LENGTH_SHORT).show();
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
if(bt==null){
Toast.makeText(getApplicationContext(), "no bluetooth on device",Toast.LENGTH_SHORT).show();
finish();
}
else
{
if(!bt.isEnabled()){
Intent intent=new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(intent,1);
}
}
listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View arg1, int arg2, long arg3) {
Toast.makeText(getApplicationContext(), (CharSequence) parent.getItemAtPosition(arg2), Toast.LENGTH_SHORT).show();
if(bt.isDiscovering())
{
bt.cancelDiscovery();
}
BluetoothDevice selectedDevice = (BluetoothDevice) parent.getItemAtPosition(arg2);
}
});
}
public void onButtonClick(View v)
{
getpaireddevices();
}
public void onButtonClick2(View v)
{
startdiscovery();
}
private void getpaireddevices() {
devicesArray = bt.getBondedDevices();
if (devicesArray.size() > 0) {
for (BluetoothDevice device : devicesArray)
listAdapter.add(device.getName());
}
}
private void startdiscovery()
{
bt.cancelDiscovery();
bt.startDiscovery();
}
private void init() {
listview = (ListView)findViewById(R.id.listView);
connectbutton = (Button)findViewById(R.id.button);
listAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,0);
listview.setAdapter(listAdapter);
bt= BluetoothAdapter.getDefaultAdapter();
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(resultCode == RESULT_CANCELED)
{
Toast.makeText(getApplicationContext(), "bluetooth must be turned on to continue",Toast.LENGTH_SHORT).show();
finish();
}
}

when I wanted to get a list of connected Bluetooth devices for my app aw well and this helped me,
Get List Of Paired Bluetooth Devices
in the first link, besides giving you a list of paired devices it has onclick, which then I used second link (how to send images via Bluetooth) to communicate with my selected device
Sending Images Over Bluetooth In Android
example:
class SendData extends Thread {
private BluetoothDevice device = null;
private BluetoothSocket btSocket = null;
private OutputStream outStream = null;
public SendData(){
device = mBluetoothAdapter.getRemoteDevice(address);
try
{
btSocket = device.createRfcommSocketToServiceRecord(MY_UUID);
}
catch (Exception e) {
// TODO: handle exception
}
mBluetoothAdapter.cancelDiscovery();
try {
btSocket.connect();
} catch (IOException e) {
try {
btSocket.close();
} catch (IOException e2) {
}
}
Toast.makeText(getBaseContext(), "Connected to " + device.getName(), Toast.LENGTH_SHORT).show();
try {
outStream = btSocket.getOutputStream();
} catch (IOException e) {
}
}
public void sendMessage()
{
try {
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
Bitmap bm = BitmapFactory.decodeResource(getResources(), R.drawable.white);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.JPEG, 100,baos); //bm is the bitmap object
byte[] b = baos.toByteArray();
Toast.makeText(getBaseContext(), String.valueOf(b.length), Toast.LENGTH_SHORT).show();
outStream.write(b);
outStream.flush();
} catch (IOException e) {
}
}
}
}
hope it helps you too!

Bluetooth android app Rfcomm connection

I wanted to start with the basics of bluetooth connection and make a simple app capable of scanning, pairing and connecting.
I'm struggling with the last concept, i followed a lot of tutorials but I couldn't make it. I don't know if you can help me but here is my code.
ublic class MainActivity extends Activity {
private final String TAG = "Debugging";
private final static int REQUEST_CODE_ENABLE_BLUETOOTH = 0;
protected static final int SUCCESS_CONNECT = 0;
protected static final int MESSAGE_READ = 1;
public static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
BluetoothAdapter btAdapter;
ArrayList<String> arrayListpaired;
ArrayAdapter<String> listAdapter,adapter;
ListView listView,listViewPaired;
Set<BluetoothDevice> deviceArray;
ArrayList<String> pairedDevices;
IntentFilter filter;
BroadcastReceiver receiver;
BluetoothDevice bdDevice;
ArrayList<BluetoothDevice> arrayListBluetoothDevices = null;
ArrayList<BluetoothDevice> arrayListPairedBluetoothDevices;
ListItemClicked listItemClicked;
ListItemClickedonPaired listItemClickedonPaired;
String tag = "debugging";
Handler mHandler= new Handler() {
public void handleMessage(Message msg){
super.handleMessage(msg);
switch(msg.what){
case SUCCESS_CONNECT:
ConnectedThread connectedThread = new ConnectedThread((BluetoothSocket)msg.obj);
Toast.makeText(getApplicationContext(),"Connect",Toast.LENGTH_LONG).show();
String s= "Succesfully connected";
connectedThread.write(s.getBytes());
Log.i(tag, "connected");
break;
case MESSAGE_READ:
byte[] readbuff=(byte[])msg.obj;
String string= readbuff.toString();
Toast.makeText(getApplicationContext(), string,Toast.LENGTH_SHORT).show();
break;
}
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btAdapter = BluetoothAdapter.getDefaultAdapter();
arrayListBluetoothDevices = new ArrayList<BluetoothDevice>();
arrayListpaired = new ArrayList<String>();
arrayListPairedBluetoothDevices = new ArrayList<BluetoothDevice>();
adapter= new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_list_item_1, arrayListpaired);
listItemClickedonPaired = new ListItemClickedonPaired();
listViewPaired = (ListView) findViewById(R.id.listView3);
listItemClicked = new ListItemClicked();
listView = (ListView) findViewById(R.id.listView2);
listAdapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_list_item_activated_1);
listView.setAdapter(listAdapter);
listAdapter.notifyDataSetChanged();
listViewPaired.setAdapter(adapter);
setupMessageButton1();
setupMessageButton2();
setupMessageButton3();
setupMessageButton4();
setupMessageButton5();
init();
getPairedDevices();
}
private void init() {
listView.setOnItemClickListener(listItemClicked);
listViewPaired.setOnItemClickListener(listItemClickedonPaired);
filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
receiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
String Action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(Action)) {
Toast.makeText(getApplicationContext(), "One Device Found", Toast.LENGTH_SHORT).show();
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
if (arrayListBluetoothDevices.size() < 1) // this checks if the size of bluetooth device is 0,then add the
{ // device to the arraylist.
listAdapter.add(device.getName() + "\n" + device.getAddress());
arrayListBluetoothDevices.add(device);
listAdapter.notifyDataSetChanged();
}
else
{
boolean flag = true; // flag to indicate that particular device is already in the arlist or not
for (int i = 0; i < arrayListBluetoothDevices.size(); i++) {
if (device.getAddress().equals(arrayListBluetoothDevices.get(i).getAddress())) {
flag = false;
}
}
if (flag == true) {
listAdapter.add(device.getName() + "\n" + device.getAddress());
arrayListBluetoothDevices.add(device);
listAdapter.notifyDataSetChanged();
}
}
}
}
};
registerReceiver(receiver, filter);
}
private void createBond(BluetoothDevice btDevice){
try
{
Method method = btDevice.getClass().getMethod("createBond", (Class[]) null);
method.invoke(btDevice, (Object[]) null);
}
catch (Exception e)
{
e.printStackTrace();
}
}
private void unpairDevice(BluetoothDevice device) {
try {
Method method = device.getClass().getMethod("removeBond", (Class[]) null);
method.invoke(device, (Object[]) null);
} catch (Exception e) {
e.printStackTrace();
}
}
private void getPairedDevices() {
Set<BluetoothDevice> pairedDevice = btAdapter.getBondedDevices();
if(pairedDevice.size()>0)
{
for(BluetoothDevice device : pairedDevice)
{
arrayListpaired.add(device.getName()+"\n"+device.getAddress());
arrayListPairedBluetoothDevices.add(device);
}
}
adapter.notifyDataSetChanged();
}
public class ListItemClicked implements OnItemClickListener {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// TODO Auto-generated method stub
bdDevice = arrayListBluetoothDevices.get(position);
Log.i("Log", "The device : " + bdDevice.toString());
getPairedDevices();
createBond(bdDevice);
adapter.notifyDataSetChanged();
Log.i("Log", "The bond is created: with" + bdDevice.toString());
}
}
private class ConnectThread extends Thread {
private final BluetoothSocket mmSocket;
private final BluetoothDevice mmDevice;
public ConnectThread(BluetoothDevice device) {
BluetoothSocket tmp = null;
mmDevice = device;
try {
tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
} catch (IOException e) { }
mmSocket = tmp;
}
public void run() {
btAdapter.cancelDiscovery();
try {
mmSocket.connect();
} catch (IOException connectException) {
try {
mmSocket.close();
} catch (IOException closeException) { }
return;
}
mHandler.obtainMessage(SUCCESS_CONNECT, mmSocket).sendToTarget();
}
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) { }
}
}
private class ConnectedThread extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
public ConnectedThread(BluetoothSocket socket) {
mmSocket = socket;
InputStream tmpIn = null;
OutputStream tmpOut = null;
// Get the input and output streams, using temp objects because
// member streams are final
try {
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e) { }
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run() {
byte[] buffer; // buffer store for the stream
int bytes; // bytes returned from read()
// Keep listening to the InputStream until an exception occurs
while (true) {
try {
// Read from the InputStream
buffer = new byte[1024];
bytes = mmInStream.read(buffer);
// Send the obtained bytes to the UI activity
mHandler.obtainMessage(MESSAGE_READ, bytes, -1, buffer)
.sendToTarget();
} catch (IOException e) {
break;
}
}
}
/* Call this from the main activity to send data to the remote device */
public void write(byte[] bytes) {
try {
mmOutStream.write(bytes);
} catch (IOException e) { }
}
/* Call this from the main activity to shutdown the connection */
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) { }
}
}
#Override
protected void onDestroy() {
super.onDestroy();
btAdapter.cancelDiscovery();
unregisterReceiver(receiver);
}
class ListItemClickedonPaired implements OnItemClickListener
{
#Override
public void onItemClick(AdapterView<?> parent, View view, int position,long id) {
bdDevice = arrayListPairedBluetoothDevices.get(position);
unpairDevice(bdDevice);
//arrayListPairedBluetoothDevices.clear();
}
}
private void makeDiscoverable() {
Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 150);
startActivity(discoverableIntent);
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_CANCELED) {
Toast.makeText(MainActivity.this, "Bluetooth must be enabled to start scanning", Toast.LENGTH_SHORT).show();
} else
{
Toast.makeText(MainActivity.this, "Click on TURN_OFF to disable bluetooth", Toast.LENGTH_LONG).show();
}
}
private void setupMessageButton1() {
//1.get a reference for my button
Button messageButton = (Button) findViewById(R.id.button1);
//2. Set the click to run my code
messageButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
listAdapter.clear();
arrayListBluetoothDevices.clear();
btAdapter.startDiscovery();
}
});
}
private void setupMessageButton2() {
//1.get a reference to the button.
Button messageButton = (Button) findViewById(R.id.button2);
//2. set the click listener to run my code.
messageButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (btAdapter.isEnabled()) {
listAdapter.clear();
btAdapter.disable();
} else
{
Toast.makeText(MainActivity.this, "Dont worry it's already off", Toast.LENGTH_SHORT).show();
}
}
});
}
private void setupMessageButton3() {
//1.get a reference for my button
Button messageButton = (Button) findViewById(R.id.button3);
//2. Set the click to run my code
messageButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
finish();
}
});
}
private void setupMessageButton4() {
//1.get a reference for my button
Button messageButton = (Button) findViewById(R.id.button4);
//2. Set the click to run my code
messageButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
btAdapter.enable();
}
});
}
private void setupMessageButton5() {
//1.get a reference for my button
Button messageButton = (Button) findViewById(R.id.button5);
//2. Set the click to run my code
messageButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
makeDiscoverable();
}
});
}
}
Concerning the log i have that message :
"D/BluetoothUtils﹕ isSocketAllowedBySecurityPolicy start : device null"
"W/BluetoothAdapter﹕ getBluetoothService() called with no BluetoothManagerCallback"
"D/BluetoothSocket﹕ connect(), SocketState: INIT, mPfd: {ParcelFileDescriptor: FileDescriptor[75]} "
public class ListItemClicked implements OnItemClickListener {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// TODO Auto-generated method stub
bdDevice = arrayListBluetoothDevices.get(position);
Log.i("Log", "The device : " + bdDevice.toString());
createBond(bdDevice);
adapter.notifyDataSetChanged();
ConnectThread connect = new ConnectThread(bdDevice);
connect.start();
}
}
For the connection, i use the ConnectThread found in Bluetooth APi developer Website:
private class ConnectThread extends Thread {
private final BluetoothSocket mmSocket;
private final BluetoothDevice mmDevice;
public ConnectThread(BluetoothDevice device) {
BluetoothSocket tmp = null;
mmDevice = device;
try {
tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
} catch (IOException e) { }
mmSocket = tmp;
}
public void run() {
btAdapter.cancelDiscovery();
try {
mmSocket.connect();
} catch (IOException connectException) {
try {
mmSocket.close();
} catch (IOException closeException) { }
return;
}
mHandler.obtainMessage(SUCCESS_CONNECT, mmSocket).sendToTarget();
}
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) { }
}
}

it's ok i found the solution, i had the problem with the phone i'm using, he is not supporting SPP.
Thank you anyway