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java.lang.ArrayIndexOutOfBoundsException: length=1; index=1 [duplicate]

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What causes a java.lang.ArrayIndexOutOfBoundsException and how do I prevent it?
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Closed 3 years ago.
I am want to separate the strings incoming from arduino and store it in variables for database purposes but when I try to divide that string using split() after a few moments the exception occurs
java.lang.ArrayIndexOutOfBoundsException: length=1; index=1 and the app keeps stopping
the error is at Line 203 separated[1]
public class MainActivity extends AppCompatActivity {
private static final String TAG = "Android-Arduino";
Button btnOn, btnOff;
TextView temperatureText, heartbeatText;
Handler h;
final int RECIEVE_MESSAGE = 1;
private BluetoothAdapter btAdapter = null;
private BluetoothSocket btSocket = null;
private StringBuilder sb = new StringBuilder();
private ConnectedThread connectedThread;
// Common service that bluetooth device support
private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
// MAC address of the bluetooth module.
private static String address = "00:18:E4:35:75:A6";
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
temperatureText = (TextView) findViewById(R.id.temp);
heartbeatText = (TextView)findViewById(R.id.heartbeat);
getDataArduino();
// Bluetooth adapter
btAdapter = BluetoothAdapter.getDefaultAdapter();
// Check whether the bluetooth is enabled / disabled
checkBTState();
}
// Creates the communication chanel
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();
// Set up a pointer to the remote node using it's address.
BluetoothDevice device = btAdapter.getRemoteDevice(address);
try {
btSocket = createBluetoothSocket(device);
} catch (IOException e) {
errorExit("Fatal Error", "In onResume() and socket create failed: "
+ e.getMessage() + ".");
}
btAdapter.cancelDiscovery();
try {
btSocket.connect();
} catch (IOException e) {
try {
btSocket.close();
} catch (IOException ex) {
errorExit("Fatal Error", "In onResume() and unable to close socket during " +
"connection failure" + ex.getMessage() + ".");
}
}
// Creates the data stream with the server
connectedThread = new ConnectedThread(btSocket);
connectedThread.start();
}
#Override
public void onPause() {
super.onPause();
try {
btSocket.close();
} catch (IOException ex) {
errorExit("Fatal Error", "In onPause() and failed to close socket." +
ex.getMessage() + ".");
}
}
private void checkBTState() {
// Checks if the devices has bluetooth functionalities
if(btAdapter==null) {
errorExit("Fatal Error", "Bluetooth not support");
} else {
// Checks if the bluetooth is on
if (btAdapter.isEnabled()) {
} 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 class ConnectedThread extends Thread {
private final InputStream mmInStream;
private final OutputStream mmOutStream;
public ConnectedThread(BluetoothSocket 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 = new byte[256]; // 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
// Get number of bytes and message in "buffer"
bytes = mmInStream.read(buffer);
// Send to message queue Handler
h.obtainMessage(RECIEVE_MESSAGE, bytes, -1, buffer).sendToTarget();
} catch (IOException e) {
break;
}
}
}
//Call this from the main activity to send data to the remote device
public void write(String message) {
byte[] msgBuffer = message.getBytes();
try {
mmOutStream.write(msgBuffer);
} catch (IOException e) {
Log.d(TAG, "...Error data send: " + e.getMessage() + "...");
}
}
}
public void getDataArduino() {
temperatureText.clearComposingText();
h = new Handler() {
public void handleMessage(android.os.Message msg) {
switch (msg.what) {
case RECIEVE_MESSAGE:
byte[] readBuf = (byte[]) msg.obj;
String strIncom = new String(readBuf, 0, msg.arg1);
sb.append(strIncom);
int endOfLineIndex = sb.indexOf("\n");
if (endOfLineIndex > 0) {
String sbprint = sb.substring(0, endOfLineIndex);
sb.delete(0, sb.length());
String[] separated = sbprint.split(":");
heartbeatText.setText(separated[0]+ "");
temperatureText.setText(separated[1]+ "");
}
Log.d(TAG, "...String:"+ sb.toString() + "Byte:" + msg.arg1 + "...");
break;
}
}
};
}
}
I need the temperature to display differently and heartrate to be displayed individually.

You can first try to print the input data (StringBuffer sb) and split String array(String[] separated). You are getting error because the Strings have not split as your expected and only 1 element is present in the array sbprint, this is why when you try to access the second element you get ArrayIndexOutofBound index.
Once you print the Split String Array it would give you an idea where your data is wrong.

Bluetooth sending all String in one time (not bit by bit only whole byte at once)

In my mobile robot project, which have 2 servo motors to rotate the camera in two planes I want to control them in my android app by rotation the smartphone (through readings yaw/pitch/roll from the smartphone accelometer).
For that I have to send data about this three angles through Bluetooth to Arduino. So for example sample data packet looks like
"Y:100,P:20,R:45"
where [Y-yaw, P-pitch,R-roll]. However, when I try to send this kind of data packet through Bluetooth from my smartphone to Arduino, in Arduino the packet is received bit by bit, so above shown data packet in Serial Port Monitor looks like:
Y
:
1
0
0
etc. (which makes it much harder to read this data and their correct acquisition, because my smartphone sends as well other data to control the direction of mobile robot [engines]).
So if I using smartphone + Bluetooth + Arduino -> it is possible to send a whole packet of data at once, no bit by bit ???
This is the code from Android Studio (about Bluetooth Activity):
package com.samplecompass;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.UUID;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Context;
import android.os.Handler;
import android.util.Log;
public class cBluetooth{
public final static String TAG = "BL_4WD";
private static BluetoothAdapter btAdapter = null;
private BluetoothSocket btSocket = null;
private OutputStream outStream = null;
private ConnectedThread mConnectedThread;
// SPP UUID service
private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
private final Handler mHandler;
public final static int BL_NOT_AVAILABLE = 1; // ������ ��� Handler
public final static int BL_INCORRECT_ADDRESS = 2;
public final static int BL_REQUEST_ENABLE = 3;
public final static int BL_SOCKET_FAILED = 4;
public final static int RECIEVE_MESSAGE = 5;
cBluetooth(Context context, Handler handler){
btAdapter = BluetoothAdapter.getDefaultAdapter();
mHandler = handler;
if (btAdapter == null) {
mHandler.sendEmptyMessage(BL_NOT_AVAILABLE);
return;
}
}
public void checkBTState() {
if(btAdapter == null) {
mHandler.sendEmptyMessage(BL_NOT_AVAILABLE);
} else {
if (btAdapter.isEnabled()) {
Log.d(TAG, "Bluetooth ON");
} else {
mHandler.sendEmptyMessage(BL_REQUEST_ENABLE);
}
}
}
public void BT_Connect(String address) {
Log.d(TAG, "...On Resume...");
if(!BluetoothAdapter.checkBluetoothAddress(address)){
mHandler.sendEmptyMessage(BL_INCORRECT_ADDRESS);
return;
}
else{
BluetoothDevice device = btAdapter.getRemoteDevice(address);
try {
btSocket = device.createRfcommSocketToServiceRecord(MY_UUID);
} catch (IOException e) {
Log.d(TAG, "In onResume() and socket create failed: " + e.getMessage());
mHandler.sendEmptyMessage(BL_SOCKET_FAILED);
return;
}
btAdapter.cancelDiscovery();
Log.d(TAG, "...Connecting...");
try {
btSocket.connect();
Log.d(TAG, "...Connection ok...");
} catch (IOException e) {
try {
btSocket.close();
} catch (IOException e2) {
Log.d(TAG, "In onResume() and unable to close socket during connection failure" + e2.getMessage());
mHandler.sendEmptyMessage(BL_SOCKET_FAILED);
return;
}
}
// Create a data stream so we can talk to server.
Log.d(TAG, "...Create Socket...");
try {
outStream = btSocket.getOutputStream();
} catch (IOException e) {
Log.d(TAG, "In onResume() and output stream creation failed:" + e.getMessage());
mHandler.sendEmptyMessage(BL_SOCKET_FAILED);
return;
}
mConnectedThread = new ConnectedThread();
mConnectedThread.start();
}
}
public void BT_onPause() {
Log.d(TAG, "...On Pause...");
if (outStream != null) {
try {
outStream.flush();
} catch (IOException e) {
Log.d(TAG, "In onPause() and failed to flush output stream: " + e.getMessage());
mHandler.sendEmptyMessage(BL_SOCKET_FAILED);
return;
}
}
if (btSocket != null) {
try {
btSocket.close();
} catch (IOException e2) {
Log.d(TAG, "In onPause() and failed to close socket." + e2.getMessage());
mHandler.sendEmptyMessage(BL_SOCKET_FAILED);
return;
}
}
}
public void sendData(String message) {
byte[] msgBuffer = message.getBytes();
Log.i(TAG, "Send data: " + message);
if (outStream != null) {
try {
outStream.write(msgBuffer);
} catch (IOException e) {
Log.d(TAG, "In onResume() and an exception occurred during write: " + e.getMessage());
mHandler.sendEmptyMessage(BL_SOCKET_FAILED);
return;
}
} else Log.d(TAG, "Error Send data: outStream is Null");
}
/**
public void write(byte[] bytes) {
try {
outStream.write(bytes);
} catch (IOException e) { System.out.println(e); }
}
**/
private class ConnectedThread extends Thread {
private final InputStream mmInStream;
public ConnectedThread() {
InputStream tmpIn = null;
// Get the input and output streams, using temp objects because
// member streams are final
try {
tmpIn = btSocket.getInputStream();
} catch (IOException e) { }
mmInStream = tmpIn;
}
public void run() {
byte[] buffer = new byte[256]; // 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
bytes = mmInStream.read(buffer);
mHandler.obtainMessage(RECIEVE_MESSAGE, bytes, -1, buffer).sendToTarget();
} catch (IOException e) {
break;
}
}
}
}
}

Bluetooth IsConnected()

I'm doing an Bluetooth application which I connect any device and do some work. I have lots of activities. I do all connection stuff in the BlutoothConnectionService.java class. In my BondedDevicesActivity I click a device that I would like to connect. Then service works and another activity is opened. Then I click some buttons which opens another activities. In all activity I'm sending some information via bluetooth. Thus whenever I open another activity I use BlutoothConnectionService.java class. Problem is in this class, it always trying to connect to device. I would like that once it is connected, it never tries it again until connection is dead. But I couldn't figure out how to make that. I know there is a method called isConnected() but I don't know where to put it in the service class. Here is my code of service:
public class BluetoothConnectionService {
private static final String TAG = "BluetoothConnectionSrvc";
private static final UUID connectionUUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
private final BluetoothAdapter bluetoothAdapter;
Context ctx;
private ConnectThread connectThread;
private BluetoothDevice bluetoothDevice;
private UUID deviceUUID;
ProgressDialog progressDialog;
private ConnectedThread connectedThread;
String incomingMessage;
public BluetoothConnectionService(Context context, BluetoothDevice device, UUID uuid) {
bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
ctx = context;
startClient(device, uuid);
}
public void startClient(BluetoothDevice device, UUID uuid) {
Log.d(TAG, "startClient: Started.");
connectThread = new ConnectThread(device, uuid);
connectThread.start();
}
private class ConnectThread extends Thread {
private BluetoothSocket bluetoothSocket;
public ConnectThread(BluetoothDevice device, UUID uuid) {
Log.d(TAG, "ConnectThread: started.");
bluetoothDevice = device;
deviceUUID = uuid;
}
public void run() {
Log.i(TAG, "ConnectThread: Run.");
BluetoothSocket tmp = null;
try {
Log.d(TAG, "ConnectThread: Trying to create RFcommSocket using UUID: " + connectionUUID);
tmp = bluetoothDevice.createRfcommSocketToServiceRecord(deviceUUID);
progressDialog = ProgressDialog.show(ctx, "Cihaza Bağlanılıyor", "Lütfen Bekleyiniz...", true);
} catch (Exception e) {
progressDialog.dismiss();
e.printStackTrace();
Log.e(TAG, "ConnectThread: Couldn't create RFcommSocket" + e.getMessage());
showMessage("Cihaza bağlanılamadı, lütfen bağlantınızı kontrol ederek tekrar deneyiniz.");
AnaEkranActivity.instance.finish();
}
if (tmp != null) {
bluetoothSocket = tmp;
bluetoothAdapter.cancelDiscovery();
try {
bluetoothSocket.connect();
Log.d(TAG, "run: ConnectionThread connected.");
connected(bluetoothSocket);
} catch (Exception e) {
progressDialog.dismiss();
e.printStackTrace();
showMessage("Cihaza bağlanılamadı, lütfen bağlantınızı kontrol ederek tekrar deneyiniz.");
AnaEkranActivity.instance.finish();
try {
bluetoothSocket.close();
Log.d(TAG, "run: Closed Socket.");
} catch (Exception e1) {
e1.printStackTrace();
Log.e(TAG, "ConnectThread: run: Unable to close connection in socket" + e1.getMessage());
}
Log.d(TAG, "run: ConnectThread: Could not connect to UUID: " + connectionUUID);
}
}
}
}
public void connected(BluetoothSocket socket) {
Log.d(TAG, "Connected: Starting.");
connectedThread = new ConnectedThread(socket);
connectedThread.start();
}
private class ConnectedThread extends Thread {
private final BluetoothSocket bluetoothSocket;
private final InputStream inputStream;
private final OutputStream outputStream;
public ConnectedThread(BluetoothSocket socket) {
Log.d(TAG, "ConnectedThread: Starting.");
bluetoothSocket = socket;
InputStream tmpIn = null;
OutputStream tmpOut = null;
try {
progressDialog.dismiss();
} catch (Exception e) {
e.printStackTrace();
}
try {
tmpIn = bluetoothSocket.getInputStream();
tmpOut = bluetoothSocket.getOutputStream();
} catch (Exception e) {
e.printStackTrace();
}
inputStream = tmpIn;
outputStream = tmpOut;
}
public void run() {
byte[] readBuffer = new byte[1024];
int readBytes;
while (true) {
try {
readBytes = inputStream.read(readBuffer);
incomingMessage = new String(readBuffer, 0, readBytes);
Log.d(TAG, "InputStream: " + incomingMessage);
showMessage(incomingMessage);
} catch (Exception e) {
e.printStackTrace();
Log.e(TAG, "read: Error reading from inputStream." + e.getMessage());
showMessage("Connection is dead.");
AnaEkranActivity.instance.finish();
break;
}
}
}
public void write(byte[] writeBytes) {
String text = new String(writeBytes, Charset.defaultCharset());
Log.d(TAG, "write: Writing to outputStream: " + text);
try {
outputStream.write(writeBytes);
} catch (Exception e) {
e.printStackTrace();
Log.e(TAG, "write: Error writing to outputStream." + e.getMessage());
showMessage("Error while writing.");
}
}
}
public void write (byte[] out) {
Log.d(TAG, "write: Write Called.");
connectedThread.write(out);
}
public String read () {
Log.d(TAG, "read: Read Called.");
connectedThread.run();
return incomingMessage;
}
public void showMessage(final String toastMessage) {
AnaEkranActivity.instance.runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(ctx, toastMessage, Toast.LENGTH_SHORT).show();
}
});
}
}
Any idea ?

In android documentation you will get this answer. There we are using same thing in Bluetooth chatting app. Here is the link Bluetooth chat app
Which gives you information about connection. And this explanation
will help you to solve this problem. Go through once clearly you will get the solution.

Android UI from other thread

I'm creating an application that gets the get the homestatus from a server in json but this happens on another thread. this isn't a problem when i try to set most Items on the ui because i can set them in a static void. but when i try to create a new switch and space i can't call 'this' to create a new.
code for getting the homestatus:
public void loadHomeStatus()
{
if(socket != null) {`enter code here`
if (socket.isConnected()) {
Log.d("BtnUpdate","already connected");
return;
}
}
swAlarm = (Switch) findViewById(R.id.swAlarmState);
tvTemperature = (TextView) findViewById(R.id.tvTemprateur);
tvHumidity = (TextView) findViewById(R.id.tvHumidity);
llDevices = (LinearLayout) findViewById(R.id.llDevices);
new Thread() {
public void run() {
try
{
busyConnecting = true;
Log.d("loadHomeStatus","trying to connect to: " + host + ":" + port);
socket = new Socket(host, port);
uiConnected();
Log.d("loadHomeStatus","Connected");
DataOutputStream os = new DataOutputStream(socket.getOutputStream());
DataInputStream is = new DataInputStream(socket.getInputStream());
os.writeBytes(password);
Log.d("Connect", "send: " + password);
while (socket.isConnected()) {
byte[] data = new byte[500];
int count = is.read(data);
String recieved = new String(data).trim();
Log.d("loadHomeStatus","recieved " + recieved );
if(recieved.toLowerCase() == "failed")
{
Log.d("loadHomeStatus","failed to log in");
}
else
{
try
{
homeStatus = new Gson().fromJson(recieved, HomeStatus.class);
uiLoadStatus();
} catch (Exception e)
{
Log.d("Error", e.toString());
}
}
}//end of while loop
Log.w("loadHomeStatus", "end connection thread ");
//ends thread
Thread.currentThread().interrupt();
return;
}
catch (UnknownHostException e)
{
e.printStackTrace();
Log.w("loadHomeStatus", "no Failed to connect: " + host + "-" + 8001);
}
catch (IOException e)
{
e.printStackTrace();
Log.w("loadHomeStatus", "no Failed to connect: " + host + "-" + 8001);
}
Log.w("loadHomeStatus","Connection ended");
socket = null;
busyConnecting = false;
uiDisconnected();
}
}.start();
}`
Code for setting ui
public static void uiLoadStatus()
{
if (homeStatus != null)
{
try {
tvTemperature.post(new Runnable()
{
public void run()
{
//Log.d("uiLoadStatus to string",homeStatus.toString());
tvTemperature.setText(homeStatus.temperature + "°C");
tvHumidity.setText(homeStatus.humidity + "%");
}
});
}
catch(Exception e)
{
Log.d("uiLoadStatus status fragment", e.toString());
}
try {
swAlarm.post(new Runnable()
{
public void run() {
swAlarm.setChecked(homeStatus.alarmState);
}
});
}
catch (Exception e)
{
Log.d("uiLoadStatus alarm fragment", e.toString());
}
}
try {
llDevices.post(new Runnable()
{
public void run() {
uiLoadDevices(); //this gives and error because it's not static
}
});
}
catch (Exception e)
{
Log.d("uiLoadStatus alarm fragment", e.toString());
}
}
public void uiLoadDevices()
{
for (int i = 0; i < homeStatus.lstDevices.size(); i++) {
String deviceAdd = homeStatus.lstDevices.get(i);
Space mySpace = new Space(this);
Switch mySwitch = new Switch(this);
mySpace.setMinimumHeight(50);
mySwitch.setText(homeStatus.getName(deviceAdd));
mySwitch.setChecked(homeStatus.getState(deviceAdd));
mySwitch.setTextSize(18);
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
lp.gravity = Gravity.LEFT;
llDevices.addView(mySpace, lp);
llDevices.addView(mySwitch, lp);
}
}

You should use AsyncTask and put the network interaction part in the doInBackground() method. To update the UI components, implement those logics in the onPostExecute() method

uiLoadStatus is a static method (not sure why or if it has to be without looking at all of your code) and therefore you cannot call non-static methods from within it, such as uiLoadDevices
I would advise taking a look at your code and update your uiLoadStatus to not be static if at all possible. Abusing static can lead to sloppy code.

Phonegap : BluetoothChatExample [Android]

I try to develop a minimalistic BluetoothChat for Android with Phonegap. The Plugin is based on the Android SDK Example of the BluetoothChat as you can see in the example code.
The native BluetoothChat works fine.
The Problem is, when i call my "write"-Function, the "ConnectedThread" is always null, although the connection is established.
I can't recognize where it is set to null again, after the State was set to 3 (STATE_CONNECTED).
So when i run the program native on android, it works fine and the state during write is always 3, but when i use my phonegap plugin 'r'(ConnectedThread) becomes null :
public void write(byte[] out) {
// Create temporary object
ConnectedThread r;
// Synchronize a copy of the ConnectedThread
synchronized (this) {
Log.i(TAG, "State "+mState);
if (mState != STATE_CONNECTED) return;
Log.i(TAG, "Connected Thread "+mConnectedThread);
r = mConnectedThread;
}
// Perform the write unsynchronized
r.write(out);
}
I used a lot of debug messages, but i was never informed that the state is null again.
Full source code :
PLUGIN.java
public class BluetoothConnection extends CordovaPlugin {
//Android specific tag-messages
private static final String TAG ="BluetoothConnection";
private static final boolean D = true;
// Member-Variables
public BluetoothAdapter mBluetoothAdapter;
public JSONArray mListOfDiscoveredDevices;
public String mConnectedDeviceName;
public ConnectionHandler mConnectionHandler;
// Phonegap-specific actions, which call the function
public String ACTION_ENABLEBLUETOOTH = "enableBluetooth";
public String ACTION_DISABLEBLUETOOTH = "disableBluetooth";
public String ACTION_DISCOVERDECIVES = "discoverDevices";
public String ACTION_STOPDISCOVERDEVICES = "stopDiscoverDevices";
public String ACTION_CREATEBOND = "createBond";
public String ACTION_WRITEMESSAGE = "writeMessage";
// not usable, this moment
public String ACTION_DISCONNECT = "disconnect";
//Message types sent from the ConnectionHandler
public static final int MESSAGE_STATE_CHANGE = 1;
public static final int MESSAGE_READ = 2;
public static final int MESSAGE_WRITE = 3;
public static final int MESSAGE_DEVICE_NAME = 4;
public static final int MESSAGE_TOAST = 5;
public static final String DEVICE_NAME = "device_name";
public static final String TOAST = "toast";
#Override
public boolean execute(String action, JSONArray args,
CallbackContext callbackContext) throws JSONException {
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter.equals(null)) {
Log.i(TAG, "no adapter was found");
}
mConnectionHandler = new ConnectionHandler(mHandler);
if (action.equals(ACTION_ENABLEBLUETOOTH)) {
enableBluetooth();
}
else if (action.equals(ACTION_DISABLEBLUETOOTH)) {
disableBluetooth();
}
else if (action.equals(ACTION_DISCOVERDECIVES)) {
discoverDevices();
}
else if (action.equals(ACTION_STOPDISCOVERDEVICES)) {
stopDiscovering(callbackContext);
}
else if (action.equals(ACTION_CREATEBOND)) {
try {
BluetoothDevice remoteBtDevice = createBond(args, callbackContext);
connect(remoteBtDevice, callbackContext);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
else if(action.equals(ACTION_WRITEMESSAGE)){
writeMessage(args.getString(0));
}
else if (action.equals(ACTION_DISCONNECT)) {
disconnect();
}
return false;
}
public void enableBluetooth() {
if (!mBluetoothAdapter.equals(null)) {
mBluetoothAdapter.enable();
Log.i(TAG, "bluetooth on");
}
}
public void disableBluetooth() {
if (mBluetoothAdapter.isEnabled()) {
mBluetoothAdapter.disable();
Log.i(TAG, "bluetooth off");
}
}
public void discoverDevices() {
mListOfDiscoveredDevices = new JSONArray();
Log.i("Log", "in the start searching method");
IntentFilter intentFilter = new IntentFilter(
BluetoothDevice.ACTION_FOUND);
cordova.getActivity().registerReceiver(mFoundDevices, intentFilter);
mBluetoothAdapter.startDiscovery();
}
private void stopDiscovering(CallbackContext callbackContext) {
if (mBluetoothAdapter.isDiscovering()) {
mBluetoothAdapter.cancelDiscovery();
}
PluginResult res = new PluginResult(PluginResult.Status.OK,
mListOfDiscoveredDevices);
res.setKeepCallback(true);
callbackContext.sendPluginResult(res);
Log.i("Info", "Stopped discovering Devices !");
}
public BluetoothDevice createBond(JSONArray args, CallbackContext callbackContext) throws Exception {
String macAddress = args.getString(0);
Log.i(TAG, "Connect to MacAddress "+macAddress);
BluetoothDevice btDevice = mBluetoothAdapter.getRemoteDevice(macAddress);
Log.i("Device","Device "+btDevice);
Class class1 = Class.forName("android.bluetooth.BluetoothDevice");
Method createBondMethod = class1.getMethod("createBond");
Boolean returnValue = (Boolean) createBondMethod.invoke(btDevice);
if(btDevice.equals(null))
throw new NullPointerException("Remote BluetoothDevice could not be paired !");
return btDevice;
}
public void removeBond(BluetoothDevice btDevice) throws Exception {
Class btClass = Class.forName("android.bluetooth.BluetoothDevice");
Method removeBondMethod = btClass.getMethod("removeBond");
Boolean returnValue = (Boolean) removeBondMethod.invoke(btDevice);
}
public void connect(BluetoothDevice btDevice, CallbackContext callbackContext) {
if(!btDevice.equals(null)){
mConnectionHandler.connect(btDevice, false);
PluginResult result = new PluginResult(PluginResult.Status.NO_RESULT);
result.setKeepCallback(true);
callbackContext.sendPluginResult(result);
Log.i(TAG, "Status after connecting "+mConnectionHandler.getState());
}
else {
callbackContext.error("Could not connect to "+btDevice.getAddress());
}
}
public void disconnect(){
}
public void writeMessage(String message){
if(mConnectionHandler.getState() != ConnectionHandler.STATE_CONNECTED){
Log.i(TAG, "Could not write to device");
Log.i(TAG, "State "+mConnectionHandler.getState());
}
if(message.length() > 0) {
byte[] send = message.getBytes();
mConnectionHandler.write(send);
Log.i(TAG, "sending "+message);
}
else {
Log.i(TAG, "There is nothing to send.");
}
}
private BroadcastReceiver mFoundDevices = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
Message msg = Message.obtain();
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
Toast.makeText(context, "found Device !", Toast.LENGTH_SHORT).show();
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
Log.i("FOUND", "Name " + device.getName() + "-" + device.getAddress());
JSONObject discoveredDevice = new JSONObject();
try {
discoveredDevice.put("name", device.getName());
discoveredDevice.put("adress", device.getAddress());
if (!isJSONInArray(discoveredDevice)) {
mListOfDiscoveredDevices.put(discoveredDevice);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
};
private final Handler mHandler = new Handler() {
#Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MESSAGE_STATE_CHANGE:
if(D) Log.i(TAG, "MESSAGE_STATE_CHANGE: " + msg.arg1);
switch (msg.arg1) {
case ConnectionHandler.STATE_CONNECTED:
Log.i(TAG, "ConnectionHandler.STATE_CONNECTED !");
break;
case ConnectionHandler.STATE_CONNECTING:
Log.i(TAG, "ConnectionHandler.STATE_CONNECTING !");
break;
case ConnectionHandler.STATE_LISTEN:
Log.i(TAG, "ConnectionHandler.STATE_LISTEN !");
break;
case ConnectionHandler.STATE_NONE:
Log.i(TAG, "ConnectionHandler.STATE_NONE !");
break;
}
break;
case MESSAGE_WRITE:
byte[] writeBuf = (byte[]) msg.obj;
// construct a string from the buffer
String writeMessage = new String(writeBuf);
Log.i(TAG, "Write "+writeMessage);
break;
case MESSAGE_READ:
byte[] readBuf = (byte[]) msg.obj;
// construct a string from the valid bytes in the buffer
String readMessage = new String(readBuf, 0, msg.arg1);
Log.i(TAG, "Read "+readMessage);
break;
case MESSAGE_DEVICE_NAME:
// save the connected device's name
mConnectedDeviceName = msg.getData().getString(DEVICE_NAME);
Log.i(TAG, mConnectedDeviceName);
break;
case MESSAGE_TOAST:
String message = msg.getData().getString(TOAST);
Log.i(TAG, "Connection lost : " +message);
break;
}
}
};}
CONNECTION-HANDLER
public class ConnectionHandler {
// Debugging
private static final String TAG = "BluetoothChatService";
private static final boolean D = true;
// Name for the SDP record when creating server socket
private static final String NAME_SECURE = "BluetoothChatSecure";
private static final String NAME_INSECURE = "BluetoothChatInsecure";
// Unique UUID for this application
private static final UUID MY_UUID_SECURE =
UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
private static final UUID MY_UUID_INSECURE =
UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
// Member fields
private final BluetoothAdapter mAdapter;
private final Handler mHandler;
private AcceptThread mSecureAcceptThread;
private AcceptThread mInsecureAcceptThread;
private ConnectThread mConnectThread;
private ConnectedThread mConnectedThread;
private int mState;
// Constants that indicate the current connection state
public static final int STATE_NONE = 0; // we're doing nothing
public static final int STATE_LISTEN = 1; // now listening for incoming connections
public static final int STATE_CONNECTING = 2; // now initiating an outgoing connection
public static final int STATE_CONNECTED = 3; // now connected to a remote device
public ConnectionHandler(Handler handler) {
mAdapter = BluetoothAdapter.getDefaultAdapter();
mState = STATE_NONE;
mHandler = handler;
}
private synchronized void setState(int state) {
if (D) Log.d(TAG, "setState() " + mState + " -> " + state);
mState = state;
// Give the new state to the Handler so the UI Activity can update
mHandler.obtainMessage(BluetoothConnection.MESSAGE_STATE_CHANGE, state, -1).sendToTarget();
}
public synchronized int getState() {
return mState;
}
public synchronized void start() {
if (D) Log.d(TAG, "start");
// Cancel any thread attempting to make a connection
if (mConnectThread != null) {mConnectThread.cancel(); mConnectThread = null;}
// Cancel any thread currently running a connection
if (mConnectedThread != null) {mConnectedThread.cancel(); mConnectedThread = null;}
setState(STATE_LISTEN);
// Start the thread to listen on a BluetoothServerSocket
if (mSecureAcceptThread == null) {
mSecureAcceptThread = new AcceptThread(true);
mSecureAcceptThread.start();
}
if (mInsecureAcceptThread == null) {
mInsecureAcceptThread = new AcceptThread(false);
mInsecureAcceptThread.start();
}
}
public synchronized void connect(BluetoothDevice device, boolean secure) {
if (D) Log.d(TAG, "connect to: " + device);
// Cancel any thread attempting to make a connection
if (mState == STATE_CONNECTING) {
if (mConnectThread != null) {mConnectThread.cancel(); mConnectThread = null;}
}
// Cancel any thread currently running a connection
if (mConnectedThread != null) {mConnectedThread.cancel(); mConnectedThread = null;}
// Start the thread to connect with the given device
mConnectThread = new ConnectThread(device, secure);
mConnectThread.start();
setState(STATE_CONNECTING);
}
public synchronized void connected(BluetoothSocket socket, BluetoothDevice
device, final String socketType) {
if (D) Log.d(TAG, "connected, Socket Type:" + socketType);
// Cancel the thread that completed the connection
if (mConnectThread != null) {mConnectThread.cancel(); mConnectThread = null;}
// Cancel any thread currently running a connection
if (mConnectedThread != null) {mConnectedThread.cancel(); mConnectedThread = null;}
// Cancel the accept thread because we only want to connect to one device
if (mSecureAcceptThread != null) {
mSecureAcceptThread.cancel();
mSecureAcceptThread = null;
}
if (mInsecureAcceptThread != null) {
mInsecureAcceptThread.cancel();
mInsecureAcceptThread = null;
}
// Start the thread to manage the connection and perform transmissions
mConnectedThread = new ConnectedThread(socket, socketType);
mConnectedThread.start();
// Send the name of the connected device back to the UI Activity
Message msg = mHandler.obtainMessage(BluetoothConnection.MESSAGE_DEVICE_NAME);
Bundle bundle = new Bundle();
bundle.putString(BluetoothConnection.DEVICE_NAME, device.getName());
msg.setData(bundle);
mHandler.sendMessage(msg);
setState(STATE_CONNECTED);
}
public synchronized void stop() {
if (D) Log.d(TAG, "stop");
if (mConnectThread != null) {
mConnectThread.cancel();
mConnectThread = null;
}
if (mConnectedThread != null) {
mConnectedThread.cancel();
mConnectedThread = null;
}
if (mSecureAcceptThread != null) {
mSecureAcceptThread.cancel();
mSecureAcceptThread = null;
}
if (mInsecureAcceptThread != null) {
mInsecureAcceptThread.cancel();
mInsecureAcceptThread = null;
}
setState(STATE_NONE);
}
public void write(byte[] out) {
// Create temporary object
ConnectedThread r;
// Synchronize a copy of the ConnectedThread
synchronized (this) {
Log.i(TAG, "State "+mState);
if (mState != STATE_CONNECTED) return;
Log.i(TAG, "Connected Thread "+mConnectedThread);
r = mConnectedThread;
}
// Perform the write unsynchronized
r.write(out);
}
private void connectionFailed() {
// Send a failure message back to the Activity
Message msg = mHandler.obtainMessage(BluetoothConnection.MESSAGE_TOAST);
Bundle bundle = new Bundle();
bundle.putString(BluetoothConnection.TOAST, "Unable to connect device");
msg.setData(bundle);
mHandler.sendMessage(msg);
// Start the service over to restart listening mode
ConnectionHandler.this.start();
}
private void connectionLost() {
// Send a failure message back to the Activity
Message msg = mHandler.obtainMessage(BluetoothConnection.MESSAGE_TOAST);
Bundle bundle = new Bundle();
bundle.putString(BluetoothConnection.TOAST, "Device connection was lost");
msg.setData(bundle);
mHandler.sendMessage(msg);
// Start the service over to restart listening mode
ConnectionHandler.this.start();
}
private class AcceptThread extends Thread {
// The local server socket
private final BluetoothServerSocket mmServerSocket;
private String mSocketType;
public AcceptThread(boolean secure) {
BluetoothServerSocket tmp = null;
mSocketType = secure ? "Secure":"Insecure";
// Create a new listening server socket
try {
if (secure) {
tmp = mAdapter.listenUsingRfcommWithServiceRecord(NAME_SECURE,
MY_UUID_SECURE);
} else {
tmp = mAdapter.listenUsingInsecureRfcommWithServiceRecord(
NAME_INSECURE, MY_UUID_INSECURE);
}
} catch (IOException e) {
Log.e(TAG, "Socket Type: " + mSocketType + "listen() failed", e);
}
mmServerSocket = tmp;
}
public void run() {
if (D) Log.d(TAG, "Socket Type: " + mSocketType +
"BEGIN mAcceptThread" + this);
setName("AcceptThread" + mSocketType);
BluetoothSocket socket = null;
// Listen to the server socket if we're not connected
while (mState != STATE_CONNECTED) {
try {
// This is a blocking call and will only return on a
// successful connection or an exception
socket = mmServerSocket.accept();
} catch (IOException e) {
Log.e(TAG, "Socket Type: " + mSocketType + "accept() failed", e);
break;
}
// If a connection was accepted
if (socket != null) {
synchronized (ConnectionHandler.this) {
switch (mState) {
case STATE_LISTEN:
case STATE_CONNECTING:
// Situation normal. Start the connected thread.
connected(socket, socket.getRemoteDevice(),
mSocketType);
break;
case STATE_NONE:
case STATE_CONNECTED:
// Either not ready or already connected. Terminate new socket.
try {
socket.close();
} catch (IOException e) {
Log.e(TAG, "Could not close unwanted socket", e);
}
break;
}
}
}
}
if (D) Log.i(TAG, "END mAcceptThread, socket Type: " + mSocketType);
}
public void cancel() {
if (D) Log.d(TAG, "Socket Type" + mSocketType + "cancel " + this);
try {
mmServerSocket.close();
} catch (IOException e) {
Log.e(TAG, "Socket Type" + mSocketType + "close() of server failed", e);
}
}
}
private class ConnectThread extends Thread {
private final BluetoothSocket mmSocket;
private final BluetoothDevice mmDevice;
private String mSocketType;
public ConnectThread(BluetoothDevice device, boolean secure) {
mmDevice = device;
BluetoothSocket tmp = null;
mSocketType = secure ? "Secure" : "Insecure";
// Get a BluetoothSocket for a connection with the
// given BluetoothDevice
try {
if (secure) {
tmp = device.createRfcommSocketToServiceRecord(
MY_UUID_SECURE);
} else {
tmp = device.createInsecureRfcommSocketToServiceRecord(
MY_UUID_INSECURE);
}
} catch (IOException e) {
Log.e(TAG, "Socket Type: " + mSocketType + "create() failed", e);
}
mmSocket = tmp;
}
public void run() {
Log.i(TAG, "BEGIN mConnectThread SocketType:" + mSocketType);
setName("ConnectThread" + mSocketType);
// Always cancel discovery because it will slow down a connection
mAdapter.cancelDiscovery();
// Make a connection to the BluetoothSocket
try {
// This is a blocking call and will only return on a
// successful connection or an exception
mmSocket.connect();
} catch (IOException e) {
// Close the socket
try {
mmSocket.close();
} catch (IOException e2) {
Log.e(TAG, "unable to close() " + mSocketType +
" socket during connection failure", e2);
}
connectionFailed();
return;
}
// Reset the ConnectThread because we're done
synchronized (ConnectionHandler.this) {
mConnectThread = null;
}
// Start the connected thread
connected(mmSocket, mmDevice, mSocketType);
}
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) {
Log.e(TAG, "close() of connect " + mSocketType + " socket failed", e);
}
}
}
private class ConnectedThread extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
public ConnectedThread(BluetoothSocket socket, String socketType) {
Log.d(TAG, "create ConnectedThread: " + socketType);
mmSocket = socket;
InputStream tmpIn = null;
OutputStream tmpOut = null;
// Get the BluetoothSocket input and output streams
try {
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e) {
Log.e(TAG, "temp sockets not created", e);
}
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run() {
Log.i(TAG, "BEGIN mConnectedThread");
byte[] buffer = new byte[1024];
int bytes;
// Keep listening to the InputStream while connected
while (true) {
try {
// Read from the InputStream
bytes = mmInStream.read(buffer);
// Send the obtained bytes to the UI Activity
mHandler.obtainMessage(BluetoothConnection.MESSAGE_READ, bytes, -1, buffer)
.sendToTarget();
} catch (IOException e) {
Log.e(TAG, "disconnected", e);
connectionLost();
// Start the service over to restart listening mode
ConnectionHandler.this.start();
break;
}
}
}
public void write(byte[] buffer) {
try {
mmOutStream.write(buffer);
// Share the sent message back to the UI Activity
mHandler.obtainMessage(BluetoothConnection.MESSAGE_WRITE, -1, -1, buffer)
.sendToTarget();
} catch (IOException e) {
Log.e(TAG, "Exception during write", e);
}
}
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) {
Log.e(TAG, "close() of connect socket failed", e);
}
}
}}
Thanks !!!

I implemented again in a new project - now it works, don't know why - but it work now.