Develop Reference

Dynamic display data TextView

I already got displayed data received from microprocesor via bluetooth. It sends me an 8-bit frame with actual Voltage and Temperature state every second.
The issue is the TextView doesn't displaying actual data. When app loads, the data is displayed and stays like that. One method to refresh data is to load app again.
I got handler and ConnectedThread which code I attach.
All the best from Poland.
bluetoothIn = new Handler() {
public void handleMessage(android.os.Message msg) {
if (msg.what == handlerState) {
String readMessage = (String) msg.obj;
sb.append(readMessage);
int endOfLineIndex = sb.indexOf(";\r\n");
if (endOfLineIndex > 0) {
String dataInPrint = sb.substring(0, endOfLineIndex);
strDlugosc.setText(dataInPrint);
int dataLenght = dataInPrint.length();
strLenght.setText("ilość otrzymanych znakow =" + String.valueOf(dataLenght));
if (sb.charAt(0) == '9') {
String statusb = sb.substring(8,9);
String temperatura = sb.substring(21, 27);
String napiecie = sb.substring(12, 18);
status.setText("Status :" + statusb);
temp_1.setText("TEMPERATURA = " + temperatura + " *C");
nap_1.setText("NAPIECIE = " + napiecie + " V");
}
}
}
private class ConnectedThread extends Thread {
private final InputStream mmInStream;
//creation of the connect thread
public ConnectedThread(BluetoothSocket socket) {
InputStream tmpIn = null;
try {
//Create I/O streams for connection
tmpIn = socket.getInputStream();
} catch (IOException e) { }
mmInStream = tmpIn;
}
public void run() {
byte[] buffer = new byte[1024];
int bytes;
// Keep looping to listen for received messages
while (!ConnectedThread.interrupted()) {
try {
bytes = mmInStream.read(buffer); //read bytes from input buffer
String readMessage = new String(buffer, 0, bytes);
// Send the obtained bytes to the UI Activity via handler
bluetoothIn.obtainMessage(handlerState, bytes, -1, readMessage).sendToTarget();
} catch (IOException e) {
break;
}
}
}

I did it before. I used a timer to get data from BlueTooth socket every 1 second
Timer t = new Timer();
t.scheduleAtFixedRate(new TimerTask() {
#Override
public void run() {
// get data from socket and set to text view here
}
}, 0, 10000 /** milliseconds **/);

Multicast Android + tethering "Network is unreachable"

Following options resulting shown error
Android App + Multicast + Tethering On + Cell Data Off
If I connected to wifi router, no errors happen. What do I wrong or is android+multicast+tethering impossible?
public class Multicast {
final static String INET_ADDR = "224.0.0.1";
final static int PORT = 8888;
private Context mContext;
public Multicast(Context context) {
mContext = context;
}
public static NetworkInterface getWlanEth() {
final String TAG = "NetworkInterface";
Enumeration<NetworkInterface> enumeration = null;
try {
enumeration = NetworkInterface.getNetworkInterfaces();
} catch (SocketException e) {
e.printStackTrace();
}
NetworkInterface wlan0 = null;
StringBuilder sb = new StringBuilder();
while (enumeration.hasMoreElements()) {
wlan0 = enumeration.nextElement();
sb.append(wlan0.getName() + " ");
if (wlan0.getName().equals("wlan0")) {
return wlan0;
}
}
return null;
}
#TargetApi(Build.VERSION_CODES.KITKAT)
public void startMulticastServer() {
Thread sendThread = new Thread(new Runnable() {
DatagramSocket serverSocket;
#Override
public void run() {
try {
if (serverSocket == null) {
serverSocket = new DatagramSocket(null);
serverSocket.setReuseAddress(true);
serverSocket.setBroadcast(true);
serverSocket.bind(new InetSocketAddress(PORT));
serverSocket.setSoTimeout(15000);
}
for (int i = 0; i < 5; i++) {
String msg = "Sent message no " + i;
InetAddress group = InetAddress.getByName(INET_ADDR);
DatagramPacket msgPacket = new DatagramPacket(msg.getBytes(),
msg.getBytes().length, group, PORT);
serverSocket.send(msgPacket);
String TAG = "Multicast-send";
Log.i(TAG, "Socket 1 send msg: " + msg);
Thread.sleep(500);
}
} catch (IOException ex) {
ex.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
try {
serverSocket.close();
} catch (Exception e) {
e.printStackTrace();
}
}
});
sendThread.start();
}
public void startMulticastClient() {
Thread getThread = new Thread(new Runnable() {
byte[] buf = new byte[256];
#TargetApi(Build.VERSION_CODES.KITKAT)
#Override
public void run() {
//Acquire the MulticastLock
WifiManager wifi = (WifiManager) mContext.getSystemService(Context.WIFI_SERVICE);
MulticastLock multicastLock = wifi.createMulticastLock("multicastLock");
multicastLock.setReferenceCounted(true);
multicastLock.acquire();
// Create a new Multicast socket (that will allow other sockets/programs
// to join it as well.
try {
MulticastSocket clientSocket = new MulticastSocket(PORT);
//Joint the Multicast group.
clientSocket.joinGroup(new InetSocketAddress(InetAddress.getByName(INET_ADDR), PORT), getWlanEth());
clientSocket.setLoopbackMode(true);
while (true) {
// Receive the information and print it.
DatagramPacket msgPacket = new DatagramPacket(buf, buf.length);
clientSocket.receive(msgPacket);
String msg = new String(msgPacket.getData());
String TAG = "Multicast-get";
Log.i(TAG, "Socket 1 received msg: " +msgPacket.getAddress()+" : "+ InetAddress.getByName(INET_ADDR) + " : " +msg);
}
} catch (IOException ex) {
multicastLock.release();
ex.printStackTrace();
}
multicastLock.release();
}
});
getThread.start();
}
}

client.getInputStream returns null

I am trying to use the WifiDirect demo api to send a recorded audio to another android device but input stream from the socket always returns null.
Any help is much appreciated.
Here are portion of the code
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(), File.separator + "SuDAB/received/"
+ "sudab-" + System.currentTimeMillis()
+ ".3gp");
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;
}
}
and
public static boolean copyFile(InputStream inputStream, OutputStream out) {
byte buf[] = new byte[1024];
int len;
long startTime = System.currentTimeMillis();
if (inputStream == null) {
return false;
}
try {
while ((len = inputStream.read(buf)) != -1) {
out.write(buf, 0, len);
}
out.close();
inputStream.close();
long endTime = System.currentTimeMillis() - startTime;
Log.v(WiFiDirectActivity.TAG, "Time taken to transfer all bytes is : " + endTime);
} catch (IOException e) {
Log.d(WiFiDirectActivity.TAG, e.toString());
return false;
}
return true;
}
this is how i pass the file to be sent to the FileTransferService
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
TextView statusText = (TextView) mContentView.findViewById(R.id.status_text);
statusText.setText("Sending: " + lastFile);
Log.d(WiFiDirectActivity.TAG, "Intent----------- " + lastFile);
Intent serviceIntent = new Intent(getActivity(), FileTransferService.class);
Log.d(WiFiDirectActivity.TAG, "File transfer service created...");
serviceIntent.setAction(FileTransferService.ACTION_SEND_FILE);
serviceIntent.putExtra(FileTransferService.EXTRAS_FILE_PATH, lastFile);
serviceIntent.putExtra(FileTransferService.EXTRAS_GROUP_OWNER_ADDRESS,
info.groupOwnerAddress.getHostAddress());
serviceIntent.putExtra(FileTransferService.EXTRAS_GROUP_OWNER_PORT, 8988);
getActivity().startService(serviceIntent);
}
});

serviceIntent.putExtra(FileTransferService.EXTRAS_FILE_PATH, lastFile);
should be
serviceIntent.putExtra(FileTransferService.EXTRAS_FILE_PATH, "file://"+lastFile);
instead.

Socket can be send only once and the Textview is not gathering the information from the server

I had two issues in the program I am making... the thing is that I want to send by a Edittext that information to a server via UDP....the thing is that the program only works the first time I run the program, I mean, if i open the application and write some text, the information is sended to the server, but if I type another thing and press to button so the new information is sended it doesn't work... the other thing is that the TextView is not appending the information, and the server send some info but the application is not gathering that information... so if someone had a clue why is this happening or what I am doing wrong I appreciated any help!... Thanks in advice...
here is the code:
public class MainActivity extends Activity implements View.OnClickListener {
public static final String SERVERIP = "190.99.20.200";
public static final int SERVERPORT = 5153;
public TextView serverResponse;
public EditText messageToSend;
public Button btnSend;
public boolean start;
public Handler handler;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
serverResponse = (TextView)findViewById(R.id.textView);
messageToSend = (EditText)findViewById(R.id.editText);
btnSend = (Button)findViewById(R.id.button);
btnSend.setOnClickListener(this);
start = false;
new Thread(new Server()).start();
try{
Thread.sleep(500);
}catch (InterruptedException e){
updatetrack("Error on Server:" + e.getMessage());
}
new Thread(new Client()).start();
handler = new Handler(){
public void handledMessage(Message msg){
String text = (String)msg.obj;
serverResponse.append(text);
}
};
}
public class Client implements Runnable {
#Override
public void run() {
while(start == false)
{
}
try{
Thread.sleep(500);
}catch (InterruptedException e1){
e1.printStackTrace();
}
try{
InetAddress serverAddres = InetAddress.getByName(SERVERIP);
updatetrack("Client:Start connectingn");
DatagramSocket socket = new DatagramSocket();
byte[] buffer;
if(!messageToSend.getText().toString().isEmpty())
{
buffer = messageToSend.getText().toString().getBytes();
}
else
{
buffer = ("Message from android").getBytes();
}
DatagramPacket packet = new DatagramPacket(buffer, buffer.length,serverAddres,SERVERPORT);
updatetrack("Client:Sending" + new String(buffer)+ "'n");
socket.send(packet);
updatetrack("Client: Messange sentn");
updatetrack("Client: Succed!n ");
socket.close();
}catch (Exception e){
updatetrack("Client:Error!n" + e.getMessage());
}
}
}
public class Server implements Runnable{
#Override
public void run() {
while (start == false)
{
}
try{
InetAddress serverAddress = InetAddress.getByName(SERVERIP);
updatetrack("nServer: Start connectingn");
DatagramSocket socket = new DatagramSocket(SERVERPORT, serverAddress);
byte[] buffer = new byte[17];
DatagramPacket packet = new DatagramPacket(buffer, buffer.length);
updatetrack("Server: Receivingn");
socket.receive(packet);
updatetrack("Server: Message received:" + new String(packet.getData())+"'n");
updatetrack("Server : Succed!n");
}catch (Exception e){
updatetrack("Server: Error!n"+ e.getMessage());
}
}
}
public void onClick(View view)
{
start = true;
}
public void updatetrack(String s)
{
Message msg = new Message();
String textTochange = s;
msg.obj = textTochange;
handler.sendMessage(msg);
}
}

The run method in your server class will run only once.
while(start == false){
}
This while loop will continue to loop until you call the onClick method, at which point the rest of the code in the run() method is executed, and the server thread killed. You need to rearrange your code a little, and place it inside the while loop:
public void run() {
while (true){
try{
InetAddress serverAddress = InetAddress.getByName(SERVERIP);
updatetrack("nServer: Start connectingn");
DatagramSocket socket = new DatagramSocket(SERVERPORT, serverAddress);
byte[] buffer = new byte[17];
DatagramPacket packet = new DatagramPacket(buffer, buffer.length);
updatetrack("Server: Receivingn");
socket.receive(packet);
updatetrack("Server: Message received:" + new String(packet.getData())+"'n");
updatetrack("Server : Succed!n");
}catch (Exception e){
updatetrack("Server: Error!n"+ e.getMessage());
}
}
}

Android Audio Track Play with noise

I am working on a peer to peer to voice call application in Android for my college project. I found sample code for streaming the mic audio through UDP. That code will help me to stream the WAV file through UDP. But it doesn't play some files properly. And also that code doesn't stream mic audio.
Please help me.
public class UdpStream extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.udpstream);
Button btnSend = (Button)findViewById(R.id.btnSend);
btnSend.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Log.d(LOG_TAG, "btnSend clicked");
SendAudio();
}
});
Button btnRecv = (Button)findViewById(R.id.btnRecv);
btnRecv.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Log.d(LOG_TAG, "btnRecv clicked");
RecvAudio();
}
});
Button btnStrmic = (Button)findViewById(R.id.btnStrmic);
btnStrmic.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Log.d(LOG_TAG, "btnStrmic clicked");
SendMicAudio();
}
});
}
static final String LOG_TAG = "UdpStream";
static final String AUDIO_FILE_PATH = "/sdcard/1.wav";
static final int AUDIO_PORT = 2048;
static final int SAMPLE_RATE = 8000;
static final int SAMPLE_INTERVAL = 20; // milliseconds
static final int SAMPLE_SIZE = 2; // bytes per sample
static final int BUF_SIZE = SAMPLE_INTERVAL*SAMPLE_INTERVAL*SAMPLE_SIZE*2;
protected String host="localhost";
public void RecvAudio()
{
Thread thrd = new Thread(new Runnable() {
#Override
public void run()
{
Log.e(LOG_TAG, "start recv thread, thread id: "
+ Thread.currentThread().getId());
AudioTrack track = new AudioTrack(AudioManager.STREAM_MUSIC,
SAMPLE_RATE, AudioFormat.CHANNEL_CONFIGURATION_MONO,
AudioFormat.ENCODING_PCM_16BIT, BUF_SIZE,
AudioTrack.MODE_STREAM);
track.play();
try
{
DatagramSocket sock = new DatagramSocket(AUDIO_PORT);
byte[] buf = new byte[BUF_SIZE];
while(true)
{
DatagramPacket pack = new DatagramPacket(buf, BUF_SIZE);
sock.receive(pack);
Log.d(LOG_TAG, "recv pack: " + pack.getLength());
track.write(pack.getData(), 0, pack.getLength());
}
}
catch (SocketException se)
{
Log.e(LOG_TAG, "SocketException: " + se.toString());
}
catch (IOException ie)
{
Log.e(LOG_TAG, "IOException" + ie.toString());
}
} // end run
});
thrd.start();
}
Toast toast;
int port=3008;
public void SendAudio()
{
toast=Toast.makeText(getApplicationContext(), port + " : " + host , Toast.LENGTH_SHORT);
Thread thrd = new Thread(new Runnable() {
#Override
public void run()
{
Log.e(LOG_TAG, "start send thread, thread id: "
+ Thread.currentThread().getId());
long file_size = 0;
int bytes_read = 0;
int bytes_count = 0;
File audio = new File(AUDIO_FILE_PATH);
FileInputStream audio_stream = null;
file_size = audio.length();
byte[] buf = new byte[BUF_SIZE];
try
{
EditText d= (EditText) findViewById(R.id.txttohost);
host=d.getText().toString();
if(host=="")
{
port=2048;
host="localhost";
}
port=2048;
InetAddress addr = InetAddress.getByName(host);
toast.setText(port + " : " + addr.toString());
toast.show();
DatagramSocket sock = new DatagramSocket();
audio_stream = new FileInputStream(audio);
while(bytes_count < file_size)
{
bytes_read = audio_stream.read(buf, 0, BUF_SIZE);
DatagramPacket pack = new DatagramPacket(buf, bytes_read,
addr, port);
sock.send(pack);
bytes_count += bytes_read;
Log.d(LOG_TAG, "bytes_count : " + bytes_count);
Thread.sleep(SAMPLE_INTERVAL, 0);
}
}
catch (InterruptedException ie)
{
Log.e(LOG_TAG, "InterruptedException");
}
catch (FileNotFoundException fnfe)
{
Log.e(LOG_TAG, "FileNotFoundException");
}
catch (SocketException se)
{
Log.e(LOG_TAG, "SocketException");
}
catch (UnknownHostException uhe)
{
Log.e(LOG_TAG, "UnknownHostException");
}
catch (IOException ie)
{
Log.e(LOG_TAG, "IOException");
}
} // end run
});
thrd.start();
}
public void SendMicAudio()
{
Thread thrd = new Thread(new Runnable() {
#Override
public void run()
{
Log.e(LOG_TAG, "start SendMicAudio thread, thread id: "
+ Thread.currentThread().getId());
AudioRecord audio_recorder = new AudioRecord(MediaRecorder.AudioSource.DEFAULT, SAMPLE_RATE,
AudioFormat.CHANNEL_CONFIGURATION_MONO,
AudioFormat.ENCODING_PCM_16BIT,
AudioRecord.getMinBufferSize(SAMPLE_RATE,
AudioFormat.CHANNEL_CONFIGURATION_MONO,
AudioFormat.ENCODING_PCM_16BIT) * 10);
int bytes_read = 0;
int bytes_count = 0;
byte[] buf = new byte[BUF_SIZE];
try
{
InetAddress addr = InetAddress.getLocalHost();
DatagramSocket sock = new DatagramSocket();
while(true)
{
bytes_read = audio_recorder.read(buf, 0, BUF_SIZE);
DatagramPacket pack = new DatagramPacket(buf, bytes_read,
addr, AUDIO_PORT);
sock.send(pack);
bytes_count += bytes_read;
Log.d(LOG_TAG, "bytes_count : " + bytes_count);
Thread.sleep(SAMPLE_INTERVAL, 0);
}
}
catch (InterruptedException ie)
{
Log.e(LOG_TAG, "InterruptedException");
}
// catch (FileNotFoundException fnfe)
// {
// Log.e(LOG_TAG, "FileNotFoundException");
// }
catch (SocketException se)
{
Log.e(LOG_TAG, "SocketException");
}
catch (UnknownHostException uhe)
{
Log.e(LOG_TAG, "UnknownHostException");
}
catch (IOException ie)
{
Log.e(LOG_TAG, "IOException");
}
} // end run
});
thrd.start();
}
}

As for as concern with my question....
The Solution is Always while playing the Audio through out speaker will cause Some noise....
So i found the following two solution to fix that...
1) Play the audio through ear piece
audio_service.setSpeakerphoneOn(false);
audio_service.setMode(AudioManager.MODE_IN_CALL);
audio_service.setRouting(AudioManager.MODE_NORMAL,AudioManager.ROUTE_EARPIECE,
AudioManager.ROUTE_ALL);
2) Next way to do use Some Audio Codec for encoding and Decoding Your Audio to play that in noiseless..