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Updating TextView with data read from bluetooth module

What I'm trying to do is to constantly update a TextView once I read a new line from a BufferedReader that reads serial data from a Bluetooth module. Currently, the data gets displayed once, then the connection is closed and nothing happens.
Shouldn't content() and refresh() functions call each other up endlessly, so that the connection is never closed?
Here's my code so far:
public class MainActivity extends AppCompatActivity {
static final UUID mUUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
String line;
int cnt = 0;
BluetoothSocket btSocket = null;
InputStream in = null;
BufferedReader br = null;
TextView data;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
data = (TextView)findViewById(R.id.data);
BluetoothAdapter bt = BluetoothAdapter.getDefaultAdapter();
System.out.println(bt.getBondedDevices());
BluetoothDevice hc06 = bt.getRemoteDevice("00:14:03:05:5A:94");
System.out.println(hc06.getName());
do {
try {
btSocket = hc06.createInsecureRfcommSocketToServiceRecord(mUUID);
System.out.println(btSocket);
btSocket.connect();
System.out.println(btSocket.isConnected());
} catch (IOException e) {
e.printStackTrace();
}
cnt++;
} while(!btSocket.isConnected()&& (cnt < 5));
content();
try {
btSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
public void content() {
try {
in = btSocket.getInputStream();
br = new BufferedReader(new InputStreamReader(in));
line = br.readLine();
System.out.println(line);
refresh();
} catch (IOException e) {
e.printStackTrace();
}
}
private void refresh(){
final Handler handler = new Handler();
final Runnable runnable = new Runnable() {
#Override
public void run() {
data.setText(line);
content();
}
};
handler.postDelayed(runnable, 100);
}
}

Cannot send and receive any data from bluetooth

I have an simple sender/receiver android app based on bluetooth. Connection between two phone is succesfully created. But data is not sending and receiving.
Code what I tried :
public class MainActivity extends Activity
{
TextView myLabel;
EditText myTextbox;
BluetoothAdapter mBluetoothAdapter;
BluetoothSocket mmSocket;
BluetoothDevice mmDevice;
OutputStream mmOutputStream;
InputStream mmInputStream;
Thread workerThread;
byte[] readBuffer;
int readBufferPosition;
volatile boolean stopWorker;
void findBT()
{
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if(mBluetoothAdapter == null)
{
myLabel.setText("No bluetooth adapter available");
}
if(!mBluetoothAdapter.isEnabled())
{
Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBluetooth, 0);
}
Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
if(pairedDevices.size() > 0)
{
for(BluetoothDevice device : pairedDevices)
{
String deviceName = device.getName();
deviceName=deviceName.replaceAll("[^A-Za-z]+", "");
//String deviceHardwareAddress = device.getAddress(); // MAC address
Log.i("## name : ",deviceName+" ");
if(deviceName.equals("GalaxyTabAwithSPen")) {
mmDevice = device;
break;
}
}
}
// tel GalaxyTabAwithSPen
// tablet GhhBbbGalaxyS
}
void openBT()
{
if(mmDevice==null)
Log.i("test","notnull");
ParcelUuid list[] = mmDevice.getUuids();
for(ParcelUuid x: list){
System.out.println(x.toString());
}
Log.i("size :"+list.length," "+list[1].toString());
UUID uuid = UUID.fromString(list[1].toString()); //Standard SerialPortService ID
//UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
try {
mmSocket = mmDevice.createRfcommSocketToServiceRecord(uuid);
mmSocket.connect();
mmOutputStream = mmSocket.getOutputStream();
mmInputStream = mmSocket.getInputStream();
beginListenForData();
myLabel.setText("Bluetooth Opened");
}
catch (Exception ex){
Log.i("IO ex : ", ex.getMessage());
}
}
void beginListenForData()
{
final Handler handler = new Handler();
final byte delimiter = 10; //This is the ASCII code for a newline character
stopWorker = false;
readBufferPosition = 0;
readBuffer = new byte[1024];
workerThread = new Thread(new Runnable()
{
public void run()
{
while(!Thread.currentThread().isInterrupted() && !stopWorker)
{
try
{
int bytesAvailable = mmInputStream.available();
if(bytesAvailable > 0)
{
byte[] packetBytes = new byte[bytesAvailable];
mmInputStream.read(packetBytes);
for(int i=0;i<bytesAvailable;i++)
{
byte b = packetBytes[i];
if(b == delimiter)
{
byte[] encodedBytes = new byte[readBufferPosition];
System.arraycopy(readBuffer, 0, encodedBytes, 0, encodedBytes.length);
final String data = new String(encodedBytes, "US-ASCII");
readBufferPosition = 0;
handler.post(new Runnable()
{
public void run()
{
myLabel.setText(data);
}
});
}
else
{
readBuffer[readBufferPosition++] = b;
}
}
}
}
catch (IOException ex)
{
Log.i("IO ex read " ,ex.getMessage());
stopWorker = true;
}
}
}
});
workerThread.start();
}
void sendData() throws IOException
{
String msg = myTextbox.getText().toString();
msg += "\n";
mmOutputStream.write(msg.getBytes());
myLabel.setText("Data Sent");
}
When I click open both tablet and mobile phone, myLabel text changed to "Blueetooth Opened" succesfully.
But when I try to send text to phone from tablet or to table from phone, nothing sended. Data listener is working. mmInputStream.available() always returns 0.
Some log details :
D/BluetoothUtils: isSocketAllowedBySecurityPolicy start : device null
W/BluetoothAdapter: getBluetoothService() called with no BluetoothManagerCallback
D/BluetoothSocket: connect(), SocketState: INIT, mPfd: {ParcelFileDescriptor: FileDescriptor[49]}

How do I initiate my BluetoothHandler to another (several) activity?

I'm making a OBDII Bluetooth Android app and i'm having some issues sending out commands. I've already made a successfully connection between my mobile device and my OBDII adapter, but when I click on another activity, the Bluetooth connection seems to quit?
When you open up the app you'll see a button that says "Connect Device". When you press that, a ListAdapter will show up with paired Bluetooth devices. Then when you have succesfully connected to the device (OBDII Adapter) it will take you to another layout where there is 3 activities that are 3 different powerplatforms for cars. This is where the problem occurs. For now, I just want to be able to read the voltage from the OBDII. But when I click my button getValue inside one of the 3 activities. I get an logcat error. And I think it's because I haven't initiated my BluetoothHandler properly. I have no idea how to do this.
MainActivity:
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
Button b1;
BluetoothAdapter mAdapter;
FragmentHostCallback mHost;
BTHandler btHandler;
private Handler mHandler = new Handler() {
#Override
public void handleMessage(Message msg) {
switch (msg.what) {
case Constants.MESSAGE_STATE_CHANGE:
switch (msg.arg1) {
case BTHandler.STATE_CONNECTED:
//setContentView(R.layout.activity_connected);
Intent intent = new Intent(MainActivity.this, Connected.class);
startActivity(intent);
Toast.makeText(getApplicationContext(), R.string.title_connected_to, Toast.LENGTH_SHORT).show();
Log.v("Log", "Connected");
break;
case BTHandler.STATE_NONE:
Toast.makeText(getApplicationContext(), R.string.title_not_connected, Toast.LENGTH_SHORT).show();
break;
}
}
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btHandler = new BTHandler(MainActivity.this, mHandler);
b1 = (Button) findViewById(R.id.connect);
b1.setOnClickListener(this);
mAdapter = BluetoothAdapter.getDefaultAdapter();
//init();
if (mAdapter == null) {
Toast.makeText(getApplicationContext(), R.string.device_not_supported, Toast.LENGTH_LONG).show();
finish();
} else {
if (!mAdapter.isEnabled()) {
Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(intent, 1);
}
}
//BTHandler btHandler = new BTHandler(MainActivity.this, mHandler);
//btHandler.connect("");
}
public void onClick(View v) {
int id = v.getId();
//String voltage = ("ATRV");
switch (id) {
case R.id.connect:
onConnect(); //Operation
Log.v("Log", "Pressed onClick");
break;
/*case R.id.getValue:
btHandler.write(voltage);
Log.v("Log", "getValue" + voltage);
break;*/
}
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_CANCELED) {
Toast.makeText(getApplicationContext(), R.string.enable_bluetooth, Toast.LENGTH_SHORT).show();
finish();
}
}
private void onConnect() {
ArrayList deviceStrs = new ArrayList();
final ArrayList<String> devices = new ArrayList();
BluetoothAdapter mAdapter = BluetoothAdapter.getDefaultAdapter();
Set pairedDevices = mAdapter.getBondedDevices();
if (pairedDevices.size() > 0) {
for (Object device : pairedDevices) {
BluetoothDevice bdevice = (BluetoothDevice) device;
deviceStrs.add(bdevice.getName() + "\n" + bdevice.getAddress());
devices.add(bdevice.getAddress());
}
}
// show list
final AlertDialog.Builder alertDialog = new AlertDialog.Builder(this);
ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.select_dialog_singlechoice,
deviceStrs.toArray(new String[deviceStrs.size()]));
alertDialog.setSingleChoiceItems(adapter, -1, new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
int position = ((AlertDialog) dialog).getListView().getCheckedItemPosition();
String deviceAddress = devices.get(position);
btHandler.connect(deviceAddress);
//btHandler.write();
}
});
alertDialog.setTitle("Paired devices");
alertDialog.show();
}
BTHandler:
public class BTHandler {
public static final int STATE_NONE = 0; // we're doing nothing
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
final ArrayList<String> devices = new ArrayList();
private final Handler mHandler;
private BluetoothAdapter mAdapter;
private BluetoothDevice device;
private ConnectThread mConnectThread;
private ConnectedThread mConnectedThread;
private BluetoothSocket socket;
private String status;
private int mState;
private boolean connectionStatus = false;
public BTHandler(Context context, Handler handler) { // Konstruktor
mAdapter = BluetoothAdapter.getDefaultAdapter();
mHandler = handler;
}
public void write(String s) {
mConnectedThread.sendRawCommand(s);
Log.v("write", "write");
}
/*
public void write(byte[] bytes) {
try {
mmOutStream.write(bytes);
} catch (IOException e) {
}
}
*/
public void connect(String deviceAddress) {
mConnectThread = new ConnectThread(deviceAddress);
mConnectThread.start();
}
private void guiHandler(int what, int arg1, String obj) {
Message msg = mHandler.obtainMessage();
msg.what = what;
msg.obj = obj;
msg.arg1 = arg1;
msg.sendToTarget();
}
private class ConnectThread extends Thread {
BluetoothSocket tmp = null;
private BluetoothSocket mmSocket;
public ConnectThread(String deviceAddress) {
mAdapter = BluetoothAdapter.getDefaultAdapter();
device = mAdapter.getRemoteDevice(deviceAddress);
BluetoothAdapter mAdapter = BluetoothAdapter.getDefaultAdapter();
BluetoothDevice device = mAdapter.getRemoteDevice(deviceAddress);
UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
try {
tmp = device.createRfcommSocketToServiceRecord(uuid);
//socket.connect();
//Log.v("connect", "connect");
} catch (IOException e) {
//e.printStackTrace();
//Log.v("exception", "e");
}
mmSocket = tmp;
}
public void run() {
// Cancel discovery because it will slow down the connection
mAdapter.cancelDiscovery();
byte[] buffer = new byte[1024]; // buffer store for the stream
int bytes;
try {
// Connect the device through the socket. This will block
// until it succeeds or throws an exception
mmSocket.connect();
Log.v("connect", "connect");
} catch (IOException connectException) {
// Unable to connect; close the socket and get out
try {
mmSocket.close();
Log.v("close", "close");
} catch (IOException closeException) {
}
guiHandler(Constants.TOAST, Constants.SHORT, "Connection Failed");
return;
}
guiHandler(Constants.CONNECTION_STATUS, Constants.STATE_CONNECTED, "");
mConnectedThread = new ConnectedThread(mmSocket);
mConnectedThread.start();
}
}
private class ConnectedThread extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
private ObdMultiCommand multiCommand;
public ConnectedThread(BluetoothSocket socket) {
connectionStatus = true;
mmSocket = socket;
InputStream tmpIn = null;
OutputStream tmpOut = null;
try {
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e) {
}
mmInStream = tmpIn;
mmOutStream = tmpOut;
try {
//RPMCommand engineRpmCommand = new RPMCommand();
//SpeedCommand speedCommand = new SpeedCommand();
ModuleVoltageCommand voltageCommand = new ModuleVoltageCommand();
while (!Thread.currentThread().isInterrupted()) {
//engineRpmCommand.run(mmInStream, mmOutStream); //(socket.getInputStream(), socket.getOutputStream());
//speedCommand.run(mmInStream, mmOutStream); //(socket.getInputStream(), socket.getOutputStream());
voltageCommand.run(socket.getInputStream(), socket.getOutputStream());
// TODO handle commands result
//Log.d("Log", "RPM: " + engineRpmCommand.getFormattedResult());
//Log.d("Log", "Speed: " + speedCommand.getFormattedResult());
Log.v("Log", "Voltage: " + voltageCommand.getFormattedResult());
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void run() {
byte[] buffer = new byte[1024]; // buffer store for the stream
int bytes; // bytes returned from read()
OBDcmds();
// Keep listening to the InputStream until an exception occurs
while (connectionStatus) {
sendMultiCommand();
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
// CALL this to MainActivity
public void sendRawCommand(String command) {
try {
new OdbRawCommand(command);
} catch (Exception e) {
Log.v("sendRawCommand", "e");
}
}
private void OBDcmds() { // execute commands
try {
new EchoOffCommand().run(socket.getInputStream(), socket.getOutputStream());
new LineFeedOffCommand().run(socket.getInputStream(), socket.getOutputStream());
new TimeoutCommand(100).run(socket.getInputStream(), socket.getOutputStream());
new SelectProtocolCommand(ObdProtocols.AUTO).run(socket.getInputStream(), socket.getOutputStream()); //ISO_15765_4_CAN
} catch (Exception e) {
Log.v("OBDcmds", "e");
// handle errors
}
}
/*
// 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) {
}
}
public void sendMultiCommand() {
try {
// RUN some code here
} catch (Exception e) {
}
}
}
}
SPA: One of the power platforms mentioned before.
public class SPA extends AppCompatActivity implements View.OnClickListener {
Button b2;
BTHandler btHandler;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sp);
b2 = (Button) findViewById(R.id.getValue);
b2.setOnClickListener(this);
}
public void onClick(View v) {
int id = v.getId();
String voltage = ("AT RV");
switch (id) {
case R.id.getValue:
btHandler.write(voltage);
Log.v("Log", "getValue" + voltage);
break;
}
}
}
Logcat:

The reason of the error is here:
BTHandler btHandler;
and you are doing this:
btHandler.write(voltage);
but the object is null referenced....
you need to initialize the BTHandler in the oncreate...
or maybe better:
use a service so you can Bind all the activities to that...
PS:
Note that the BTHandler of the MainActivity is not the same as the one declared in the SPA Class... so although that btHandler is constructed and works in MainActivity doesnt mean it will work in other activities/classes

Android - Passing simple string over Wi-fi?

I have Wi-fi direct demo. In that we can transfer any image files to other devices. When another device get connected and it shows to send image from gallery. And at other side it shows sent image. But I want to send a simple string and at other side I want to toast that string. Here I am posting a code in which they have implemented file transfer. I am very confused in this code. I am not getting where to change to pass only string. Please help me. Thanks.
DeviceDetailFragment.java
/**
* A fragment that manages a particular peer and allows interaction with device
* i.e. setting up network connection and transferring data.
*/
public class DeviceDetailFragment extends Fragment implements ConnectionInfoListener {
protected static final int CHOOSE_FILE_RESULT_CODE = 20;
private View mContentView = null;
private WifiP2pDevice device;
private WifiP2pInfo info;
ProgressDialog progressDialog = null;
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
mContentView = inflater.inflate(R.layout.device_detail, null);
mContentView.findViewById(R.id.btn_connect).setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
WifiP2pConfig config = new WifiP2pConfig();
config.deviceAddress = device.deviceAddress;
config.wps.setup = WpsInfo.PBC;
if (progressDialog != null && progressDialog.isShowing()) {
progressDialog.dismiss();
}
progressDialog = ProgressDialog.show(getActivity(), "Press back to cancel",
"Connecting to :" + device.deviceAddress, true, true
// new DialogInterface.OnCancelListener() {
//
// #Override
// public void onCancel(DialogInterface dialog) {
// ((DeviceActionListener) getActivity()).cancelDisconnect();
// }
// }
);
((DeviceActionListener) getActivity()).connect(config);
}
});
mContentView.findViewById(R.id.btn_disconnect).setOnClickListener(
new View.OnClickListener() {
#Override
public void onClick(View v) {
((DeviceActionListener) getActivity()).disconnect();
}
});
mContentView.findViewById(R.id.btn_start_client).setOnClickListener(
new View.OnClickListener() {
#Override
public void onClick(View v) {
// Allow user to pick an image from Gallery or other
// registered apps
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("image/*");
startActivityForResult(intent, CHOOSE_FILE_RESULT_CODE);
}
});
return mContentView;
}
#Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
// User has picked an image. Transfer it to group owner i.e peer using
// FileTransferService.
Uri uri = data.getData();
TextView statusText = (TextView) mContentView.findViewById(R.id.status_text);
statusText.setText("Sending: " + uri);
Log.d(WiFiDirectActivity.TAG, "Intent----------- " + uri);
Intent serviceIntent = new Intent(getActivity(), FileTransferService.class);
serviceIntent.setAction(FileTransferService.ACTION_SEND_FILE);
serviceIntent.putExtra(FileTransferService.EXTRAS_FILE_PATH, uri.toString());
serviceIntent.putExtra(FileTransferService.EXTRAS_GROUP_OWNER_ADDRESS,
info.groupOwnerAddress.getHostAddress());
serviceIntent.putExtra(FileTransferService.EXTRAS_GROUP_OWNER_PORT, 8988);
getActivity().startService(serviceIntent);
}
#Override
public void onConnectionInfoAvailable(final WifiP2pInfo info) {
if (progressDialog != null && progressDialog.isShowing()) {
progressDialog.dismiss();
}
this.info = info;
this.getView().setVisibility(View.VISIBLE);
// The owner IP is now known.
TextView view = (TextView) mContentView.findViewById(R.id.group_owner);
view.setText(getResources().getString(R.string.group_owner_text)
+ ((info.isGroupOwner == true) ? getResources().getString(R.string.yes)
: getResources().getString(R.string.no)));
// InetAddress from WifiP2pInfo struct.
view = (TextView) mContentView.findViewById(R.id.device_info);
view.setText("Group Owner IP - " + info.groupOwnerAddress.getHostAddress());
// After the group negotiation, we assign the group owner as the file
// server. The file server is single threaded, single connection server
// socket.
if (info.groupFormed && info.isGroupOwner) {
new FileServerAsyncTask(getActivity(), mContentView.findViewById(R.id.status_text))
.execute();
} else if (info.groupFormed) {
// The other device acts as the client. In this case, we enable the
// get file button.
mContentView.findViewById(R.id.btn_start_client).setVisibility(View.VISIBLE);
((TextView) mContentView.findViewById(R.id.status_text)).setText(getResources()
.getString(R.string.client_text));
}
// hide the connect button
mContentView.findViewById(R.id.btn_connect).setVisibility(View.GONE);
}
/**
* Updates the UI with device data
*
* #param device the device to be displayed
*/
public void showDetails(WifiP2pDevice device) {
this.device = device;
this.getView().setVisibility(View.VISIBLE);
TextView view = (TextView) mContentView.findViewById(R.id.device_address);
view.setText(device.deviceAddress);
view = (TextView) mContentView.findViewById(R.id.device_info);
view.setText(device.toString());
}
/**
* Clears the UI fields after a disconnect or direct mode disable operation.
*/
public void resetViews() {
mContentView.findViewById(R.id.btn_connect).setVisibility(View.VISIBLE);
TextView view = (TextView) mContentView.findViewById(R.id.device_address);
view.setText(R.string.empty);
view = (TextView) mContentView.findViewById(R.id.device_info);
view.setText(R.string.empty);
view = (TextView) mContentView.findViewById(R.id.group_owner);
view.setText(R.string.empty);
view = (TextView) mContentView.findViewById(R.id.status_text);
view.setText(R.string.empty);
mContentView.findViewById(R.id.btn_start_client).setVisibility(View.GONE);
this.getView().setVisibility(View.GONE);
}
/**
* A simple server socket that accepts connection and writes some data on
* the stream.
*/
public static class FileServerAsyncTask extends AsyncTask<Void, Void, String> {
private Context context;
private TextView statusText;
/**
* #param context
* #param statusText
*/
public FileServerAsyncTask(Context context, View statusText) {
this.context = context;
this.statusText = (TextView) statusText;
}
#Override
protected String doInBackground(Void... params) {
try {
ServerSocket serverSocket = new ServerSocket(8988);
Log.d(WiFiDirectActivity.TAG, "Server: Socket opened");
Socket client = serverSocket.accept();
Log.d(WiFiDirectActivity.TAG, "Server: connection done");
final File f = new File(Environment.getExternalStorageDirectory() + "/"
+ context.getPackageName() + "/wifip2pshared-" + System.currentTimeMillis()
+ ".jpg");
File dirs = new File(f.getParent());
if (!dirs.exists())
dirs.mkdirs();
f.createNewFile();
Log.d(WiFiDirectActivity.TAG, "server: copying files " + f.toString());
InputStream inputstream = client.getInputStream();
copyFile(inputstream, new FileOutputStream(f));
serverSocket.close();
return f.getAbsolutePath();
} catch (IOException e) {
Log.e(WiFiDirectActivity.TAG, e.getMessage());
return null;
}
}
/*
* (non-Javadoc)
* #see android.os.AsyncTask#onPostExecute(java.lang.Object)
*/
#Override
protected void onPostExecute(String result) {
if (result != null) {
statusText.setText("File copied - " + result);
Intent intent = new Intent();
intent.setAction(android.content.Intent.ACTION_VIEW);
intent.setDataAndType(Uri.parse("file://" + result), "image/*");
context.startActivity(intent);
}
}
/*
* (non-Javadoc)
* #see android.os.AsyncTask#onPreExecute()
*/
#Override
protected void onPreExecute() {
statusText.setText("Opening a server socket");
}
}
public static boolean copyFile(InputStream inputStream, OutputStream out) {
byte buf[] = new byte[1024];
int len;
long startTime=System.currentTimeMillis();
try {
while ((len = inputStream.read(buf)) != -1) {
out.write(buf, 0, len);
}
out.close();
inputStream.close();
long endTime=System.currentTimeMillis()-startTime;
Log.v("","Time taken to transfer all bytes is : "+endTime);
} catch (IOException e) {
Log.d(WiFiDirectActivity.TAG, e.toString());
return false;
}
return true;
}
}
FileTransferService.java
/**
* A service that process each file transfer request i.e Intent by opening a
* socket connection with the WiFi Direct Group Owner and writing the file
*/
public class FileTransferService extends IntentService {
private static final int SOCKET_TIMEOUT = 5000;
public static final String ACTION_SEND_FILE = "com.example.android.wifidirect.SEND_FILE";
public static final String EXTRAS_FILE_PATH = "file_url";
public static final String EXTRAS_GROUP_OWNER_ADDRESS = "go_host";
public static final String EXTRAS_GROUP_OWNER_PORT = "go_port";
public FileTransferService(String name) {
super(name);
}
public FileTransferService() {
super("FileTransferService");
}
/*
* (non-Javadoc)
* #see android.app.IntentService#onHandleIntent(android.content.Intent)
*/
#Override
protected void onHandleIntent(Intent intent) {
Context context = getApplicationContext();
if (intent.getAction().equals(ACTION_SEND_FILE)) {
String fileUri = intent.getExtras().getString(EXTRAS_FILE_PATH);
String host = intent.getExtras().getString(EXTRAS_GROUP_OWNER_ADDRESS);
Socket socket = new Socket();
int port = intent.getExtras().getInt(EXTRAS_GROUP_OWNER_PORT);
try {
Log.d(WiFiDirectActivity.TAG, "Opening client socket - ");
socket.bind(null);
socket.connect((new InetSocketAddress(host, port)), SOCKET_TIMEOUT);
Log.d(WiFiDirectActivity.TAG, "Client socket - " + socket.isConnected());
OutputStream stream = socket.getOutputStream();
ContentResolver cr = context.getContentResolver();
InputStream is = null;
try {
is = cr.openInputStream(Uri.parse(fileUri));
} catch (FileNotFoundException e) {
Log.d(WiFiDirectActivity.TAG, e.toString());
}
DeviceDetailFragment.copyFile(is, stream);
Log.d(WiFiDirectActivity.TAG, "Client: Data written");
} catch (IOException e) {
Log.e(WiFiDirectActivity.TAG, e.getMessage());
} finally {
if (socket != null) {
if (socket.isConnected()) {
try {
socket.close();
} catch (IOException e) {
// Give up
e.printStackTrace();
}
}
}
}
}
}
}

You can do something like this:
DeviceDetailFragment.java
#Override
protected String doInBackground(Void... params) {
ServerSocket serverSocket = null;
Socket client = null;
DataInputStream inputstream = null;
try {
serverSocket = new ServerSocket(8988);
client = serverSocket.accept();
inputstream = new DataInputStream(client.getInputStream());
String str = inputstream.readUTF();
serverSocket.close();
return str;
} catch (IOException e) {
Log.e(WiFiDirectActivity.TAG, e.getMessage());
return null;
}finally{
if(inputstream != null){
try{
inputstream.close();
} catch (IOException e) {
Log.e(WiFiDirectActivity.TAG, e.getMessage());
}
}
if(client != null){
try{
client.close();
} catch (IOException e) {
Log.e(WiFiDirectActivity.TAG, e.getMessage());
}
}
if(serverSocket != null){
try{
serverSocket.close();
} catch (IOException e) {
Log.e(WiFiDirectActivity.TAG, e.getMessage());
}
}
}
}
#Override
protected void onPostExecute(String result) {
if (result != null) {
Toast.makeText(..., result, ...).show();;
}
}
FileTransferService.java
#Override
protected void onHandleIntent(Intent intent) {
Context context = getApplicationContext();
if (intent.getAction().equals(ACTION_SEND_FILE)) {
String host = intent.getExtras().getString(EXTRAS_GROUP_OWNER_ADDRESS);
Socket socket = new Socket();
int port = intent.getExtras().getInt(EXTRAS_GROUP_OWNER_PORT);
DataOutputStream stream = null;
try {
socket.connect((new InetSocketAddress(host, port)), SOCKET_TIMEOUT);
stream = new DataOutputStream(socket.getOutputStream());
stream.writeUTF("a string");
} catch (IOException e) {
Log.e(WiFiDirectActivity.TAG, e.getMessage());
} finally {
if (stream != null) {
try {
stream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (socket != null) {
if (socket.isConnected()) {
try {
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
}

Android - InputStream not working correctly

I'm trying to figure out why my inputstream isn't working correctly. I am trying to connect to a server and get a JSON string and save it into the variable inputJSON. However inputJOSN is empty because my inputstream isn't working correctly. This line of code:
inputJSON = ConvertByteArrayToString(getBytesFromInputStream(inputStr));
doesn't seem to be working properly and I'm not sure why?
public class AndroidClient extends ProfileActivity {
private TextView textIn;
public Thread rt;
public Socket socket = null;
public PrintWriter outputstrwr;
public OutputStream out = null;
public DataOutputStream dataOutputStream = null;
public DataInputStream dataInputStream = null;
public InputStream inputStr = null;
private final static String LOG_TAG = AndroidClient.class.getSimpleName();
private final Handler handler = new Handler();
private List<Profile> serviceInfoList = new ArrayList<Profile>();
// Map between list position and profile
private Map<Integer, Profile> posMap = new HashMap<Integer, Profile>();
private Map<String, Integer> addressMap = new HashMap<String, Integer>();
private static String profilePicBase64Str="";
private String inputJSON = "";
private String outputJSON = "";
private String outputJSONserv = "";
private Profile p;
//String urlInputStream = "";
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Log.e(LOG_TAG, "Before OnCreate() Try");
try {
Log.e(LOG_TAG, "In OnCreate() Try");
socket = new Socket("23.23.175.213", 9000); //Port 1337
Log.e(LOG_TAG, "Created Socket");
dataOutputStream = new DataOutputStream(socket.getOutputStream());
Log.e(LOG_TAG, "Created DataOutputStream");
dataInputStream = new DataInputStream(socket.getInputStream());
Log.e(LOG_TAG, "Created DataInputStream");
//out = new OutputStream();
out = socket.getOutputStream();
inputStr = socket.getInputStream();
//Thread readjsonthrd = new Thread(new ReadJSONThread());
//inputstrrd = new InputStreamReader(socket.getInputStream());
p = new Profile();
Log.e(LOG_TAG, "Created Profile Instance");
//Gets the local profile via JSON and converts into Profile type
Gson gson = new Gson();
Log.e(LOG_TAG, "Created Gson Instance" + "GetProfileJSONStr:" + p.getProfileJSONStr());
p = gson.fromJson(p.getProfileJSONStr(), Profile.class);
setProfile(p);
Log.e(LOG_TAG, "Converted Profile to JSON");
//Gson gson = new Gson();
Log.e(LOG_TAG, "Before: outputJSON = gson.toJson(p);");
outputJSON = gson.toJson(p).toString();
outputJSON = removeExcessStr(outputJSON);
Log.e(LOG_TAG, "ProfilePicStr Base64:"+p.getProfilePicStr());
outputJSON = outputJSON.replace("Name","name");
outputJSON = outputJSON.replace("TagLine","message");
outputJSON = outputJSON.replace("Title","title");
outputJSON = outputJSON.replace("Company", "company");
outputJSON = outputJSON.replace("Industry","industry");
outputJSON = outputJSON.replace("WhatIDo","whatido");
outputJSON = outputJSON.replace("WhoDoIWantToMeet","meetwho");
outputJSON = outputJSON.replace("WHOOZNEAR_PROFILEPIC","photo");
outputJSON = outputJSON.replaceAll("[c][o][n][t][e][n][t][:][/][/][a-zA-Z0-9]+[/][a-zA-Z0-9]+[/][a-zA-Z0-9]+[/][a-zA-Z0-9]+[/][a-zA-Z0-9]+", getPicBase64Str()); /*"helloworld2"*/
if (!outputJSON.contains(",\"photo\":")) {
outputJSON = outputJSON.replace("}",",\"photo\":"+"\"IconnexUs\"}");
outputJSON = outputJSON.replace("}",",\"photo\":"+"\""+getPicBase64Str()+"\"}");
outputJSON = outputJSON.replace("}",",\"status\":\"enabled\"}");
}
else {
outputJSON = outputJSON.replace("}",",\"status\":\"enabled\"");
}
outputJSONserv = "{\"to\":\"broadcast\",\"type\":\"1\",\"payload\":"+outputJSON+"}";
Log.e(LOG_TAG, "Created outputJSON:" + outputJSON);
Log.e(LOG_TAG, "Created outputJSON Server:" + outputJSONserv);
JSONObject outObject = new JSONObject();
try {
outObject.put("photo", "hello");
outObject.put("type", "50");
outObject.put("payload", outputJSON);
outputJSON = gson.toJson(outObject).toString();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.e(LOG_TAG, "Value of PROFILEPIC STRING FROM PROFILEMAP: "+profileMap.get("WHOOZNEAR_PROFILEPIC"));
p.setProfilePicStr(ConvertandSetImagetoBase64(profileMap.get("WHOOZNEAR_PROFILEPIC")));
//String headerJSON = gson.toJson(outObject).toString();
outputJSON = outputJSON.substring(nthOccurrence(outputJSON, '{', 2)-1, nthOccurrence(outputJSON, '}', 1)-1);
String input = "["+"Ryan"+"[";
//"[foo".replaceAll(Pattern.quote("["), "\"");
String result = input.replaceAll(Pattern.quote("["), "\"");
Log.e(LOG_TAG, "REGEX REPLACEALL:"+result);
outputstrwr = new PrintWriter(new OutputStreamWriter(socket.getOutputStream()), true);
outputstrwr.write(outputJSONserv);
Log.e(LOG_TAG, "Base64 String:"+p.getProfilePicStr());
Log.e(LOG_TAG, "Sent dataOutputStream");
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.e(LOG_TAG, "Before initEventHandlers");
initEventHandlers();
Log.e(LOG_TAG, "After initEventHandlers");
//refreshViewModels();
Log.e(LOG_TAG, "Start Repeat Thread");
rt = new Thread(new RepeatingThread());
rt.start();
Log.e(LOG_TAG, "Started Repeat Thread");
}
#Override
public void onDestroy() {
super.onDestroy();
rt.stop();
try {
socket.close();
dataOutputStream.close();
dataInputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
#Override
public void onPause(){
super.onPause();
rt.stop();
}
#Override
public void onResume(){
super.onResume();
if (rt.isAlive() == false) {
//rt.start();
}
}
#Override
public void onStop(){
super.onStop();
rt.stop();
try {
socket.close();
dataOutputStream.close();
dataInputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static String removeExcessStr(String json_excess) {
//String myString = myString.replace("=\"ppshein\"", "");
String json_excess1 = json_excess.replace("\"nameValues\":{", "");
String myString = json_excess1.replace(",\"profileId\":1,\"valid\":false}", "");
return myString;
}
public static String adddblquotattr(String attr) {
String result = attr.replaceAll(Pattern.quote("["), "\"");
return result;
}
public static String adddblquotval(String val) {
String result = val.replaceAll(Pattern.quote("["), "\"");
return result;
}
public static int nthOccurrence(String str, char c, int n) {
int pos = str.indexOf(c, 0);
while (n-- > 0 && pos != -1)
pos = str.indexOf(c, pos+1);
return pos;
}
public void setPicBase64Str(String profilePicBase64Str) {
this.profilePicBase64Str = profilePicBase64Str;
}
public String getPicBase64Str() {
return profilePicBase64Str;
}
public String ConvertandSetImagetoBase64(String imagePath) {
String base64 = null;
byte[] input = null;
try{
FileInputStream fd = new FileInputStream(imagePath);
Bitmap bmt = BitmapFactory.decodeFileDescriptor(fd.getFD());
try{
ByteArrayOutputStream stream = new ByteArrayOutputStream();
Bitmap tmp = ProfileActivity.scaleDownBitmap(bmt, 10, this);
tmp.compress(Bitmap.CompressFormat.JPEG, 10, stream);
input = stream.toByteArray();
base64 = Base64.encodeToString(input, Base64.DEFAULT);
//LocalProfileActivity.input = input;
}catch(Exception e){
Log.e(LOG_TAG,"[ONACTIVITYRESULT] Could not bind input to the bytearray: " + e.getMessage());
}
}
catch (Exception e){
Log.e("LocalProfile", "ConvertandSetImagetoBase64: Could not load selected profile image");
}
return base64;
}
public String getStringFromBuffer(InputStreamReader inputstrread){
BufferedReader bRead = new BufferedReader(inputstrread);
String line = null;
StringBuffer jsonText = new StringBuffer();
try {
while((line=bRead.readLine())!=null){
jsonText.append(line);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return jsonText.toString();
}
public String ConvertByteArrayToString(byte[] b) {
// byte[] to string
String input = new String(b);
return input;
}
public byte[] ConvertStringToByteArray(String str) {
// string to byte[]
byte[] bytes = str.getBytes();
return bytes;
}
public static byte[] getBytesFromInputStream(InputStream is)
throws IOException {
// Get the size of the file
long length = is.available();
if (length > Integer.MAX_VALUE) {
// File is too large
}
// Create the byte array to hold the data
byte[] bytes = new byte[(int) length];
// Read in the bytes
int offset = 0;
int numRead = 0;
while (offset < bytes.length
&& (numRead = is.read(bytes, offset, bytes.length - offset)) >= 0) {
offset += numRead;
}
// Ensure all the bytes have been read in
if (offset < bytes.length) {
throw new IOException("Could not completely stream ");
}
// Close the input stream and return bytes
is.close();
return bytes;
}
public static String writeFile(Bitmap finalBitmap) {
String filePath = "";
String root = Environment.getExternalStorageDirectory().toString();
File myDir = new File(root + "/saved_images");
myDir.mkdirs();
Random generator = new Random();
int n = 10000;
n = generator.nextInt(n);
String fname = "Image-"+ n +".jpg";
File file = new File (myDir, fname);
if (file.exists ()) file.delete ();
try {
FileOutputStream outFile = new FileOutputStream(file);
finalBitmap.compress(Bitmap.CompressFormat.JPEG, 90, outFile);
outFile.flush();
outFile.close();
} catch (Exception e) {
e.printStackTrace();
}
filePath = root+"/saved_images/"+fname;
return filePath;
}
public class RepeatingThread implements Runnable {
private final Handler mHandler = new Handler();
private int len = 0;
private byte[] input = new byte[len];
public RepeatingThread() {
//try {
Log.e(LOG_TAG, "Before inputJSON String");
//inputJSON = dataInputStream.readUTF();
//URL url = new URL("tcp://23.23.175.213:1337");
//inputJSON = dataInputStream.readUTF();
//inputstrrd = new InputStreamReader(socket.getInputStream());
String hello = "hello world";
//String inputJSON = getStringFromBuffer(new InputStreamReader(socket.getInputStream()));
//Convert
Log.e(LOG_TAG, "After inputJSON String:" + inputJSON);
/*}
catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}*/
//LOOK HERE FIRST
//inputJSON is what is received back from the server - Take the inputJSON
//String and use regular expressions HERE to remove all the other characters in the
//string except the payload JSON.
//refreshViewModels(inputJSON);
}
#Override
public void run() {
try {
//outputstrwr.write(outputJSONserv); //UNCOMMENT IF NEED TO SEND DATA TO GET JSON BACK
inputJSON = ConvertByteArrayToString(getBytesFromInputStream(inputStr));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.e(LOG_TAG, "IN REPEATINGTHREAD-INPUTJSON:" + inputJSON);
refreshViewModels(inputJSON);
mHandler.postDelayed(this, 3000);
}
}
public void refreshViewModels(String inputJSON) {
try {
ListView servicesListView = (ListView) this
.findViewById(R.id.profilesListView);
String[] from = new String[] { "profilePic", "neighborName",
"tagLine" };
int[] to = new int[] { R.id.avatar, R.id.username, R.id.email };
// prepare the list of all records
List<HashMap<String, Object>> fillMaps = new ArrayList<HashMap<String, Object>>();
List<Profile> profiles = new ArrayList<Profile>();
// Clear the position mapping list and reset it
this.posMap.clear();
Log.i(LOG_TAG, "NEW inputJSON: " + inputJSON);
inputJSON = getPayloadStr(inputJSON);
Log.i(LOG_TAG, "NEW inputJSON2: " + inputJSON);
JSONArray profileArray = new JSONArray(inputJSON);
for (int i=0; i<profileArray.length(); i++) {
JSONObject jsonObject = profileArray.getJSONObject(i);
Gson gson = new Gson();
Profile p = gson.fromJson(gson.toJson(jsonObject).toString(), Profile.class);
profiles.add(p);
}
int pos = 0;
// Creates the fillMaps list for the listAdapter
Log.i(LOG_TAG, "Profiles size: " + profiles.size());
//showToast("Profiles size: " + profiles.size());
for (Profile p : profiles) {
// Create mapping for list adapter
HashMap<String, Object> map = new HashMap<String, Object>();
map.put("profilePic",
p.getAttributeValue("photo")== null? "Not Set" : p
.getAttributeValue("photo"));
map.put("neighborName",
p.getAttributeValue("Name") == null? "Not Set" : p
.getAttributeValue("Name"));
map.put("tagLine",
p.getAttributeValue("TagLine") == null? "Not Set" : p
.getAttributeValue("TagLine"));
fillMaps.add(map);
// Reset the postion mapping
this.posMap.put(pos++, p);
}
ListAdapter servicesListAdapter = new myAdapter(this, fillMaps,
R.layout.listitem, from, to);
servicesListView.setAdapter(servicesListAdapter);
} catch (Exception e) {
Log.e(LOG_TAG, "Error making list adapter: " + e.getMessage());
}
}
public String getPayloadStr(String profileString) {
Log.e("LOG_TAG", "Profile Str:"+profileString);
Pattern pattern = Pattern.compile(".*?payload\":(.*)\\}");
Log.e("LOG_TAG", "I got here 1");
Matcher matcher = pattern.matcher(profileString);
Log.e("LOG_TAG", "I got here 12");
//Matcher m = responseCodePattern.matcher(firstHeader);
matcher.matches();
matcher.groupCount();
//matcher.group(0);
Log.e("LOG_TAG", "I got here 2"+matcher.group(1));
return matcher.group(1);
}
private class myAdapter extends SimpleAdapter {
public myAdapter(Context context, List<? extends Map<String, ?>> data,
int resource, String[] from, int[] to) {
super(context, data, resource, from, to);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = getLayoutInflater().inflate(R.layout.listitem,
null);
}
HashMap<String, Object> data = (HashMap<String, Object>) getItem(position);
((TextView) convertView.findViewById(R.id.username))
.setText((String) data.get("neighborName"));
((TextView) convertView.findViewById(R.id.email))
.setText((String) data.get("tagLine"));
// Convert a string representing an image back to an image
String base64 = ((String)data.get("profilePic"));
byte[] picBytes = Base64.decode(base64, Base64.DEFAULT);
Bitmap bitmap = BitmapFactory.decodeByteArray(picBytes, 0, picBytes.length);
//THE IF AND THE ELSE NEED TO BE SWITCHED
if (bitmap==null){
((ImageView) convertView.findViewById(R.id.avatar)).setImageResource(R.drawable.btn_whooznear);
}else{
((ImageView) convertView.findViewById(R.id.avatar)).setImageBitmap(bitmap);
}
return convertView;
}
}
public void callProfileActivity(int position)
{
// Catch the case when service info is empty
if(serviceInfoList.size()==0){
return;
}
Profile profClick = posMap.get(position);
String b64Str = profClick.getAttributeValue("photo");
Intent startViewActivity = new Intent();
startViewActivity.putExtra("TransProfile", (Profile)posMap.get(position));
startViewActivity.putExtra("PhotoBase64", b64Str);
if(serviceInfoList.size()>position){
//DO SOMETHING HERE
}else{
Log.e(LOG_TAG,"Profile doesn't exist in sevice infoList? Selecting first one");
}
startViewActivity.setClass(this, ViewProfileActivity.class);
startActivity(startViewActivity);
}
/**
* Initialize the event handlers
*/
public void initEventHandlers() {
// Service List View
ListView servicesListView = (ListView) this
.findViewById(R.id.profilesListView);
servicesListView
.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View v,
int position, long id) {
Profile clickedProfile = posMap.get(position);
//showToast("Clicked Pos: " + position);
/*Intent intent = new Intent(ConnectActivity.this, ViewProfileActivity.class);
intent.putExtra("ClickProfile", posMap.get(position));*/
callProfileActivity(position);
}
});
}
/*#Override
public void onBackPressed() { // do something on back.
super.onBackPressed();
Intent myIntent = new Intent(AndroidClient.this, ProfileActivity.class);
startActivity(myIntent);
return;
}*/
}

Your code is rather long, so I cannot be sure of what exactly is the problem, but there is definitely an issue here:
public static byte[] getBytesFromInputStream(InputStream is)
throws IOException {
// Get the size of the file
long length = is.available();
If you are calling this right after sending your URL request, the server may not have had time to send the result back, so is.available() may return zero or another value less than the actual number of bytes you would hope would be available. Try code like this for reading in the file.