Develop Reference

connecting to socket over wifi - android

I am trying to use sockets in Android to connect over wifi to some UDP port (some_port) on a machine in my local network whose ip is some_ip.
When I run
socket = new Socket(some_ip, some_port);
I get no message error but the program does not seem to read this line and I can't log the error when surrounding with try/catch.
How can I debug that ?
Edit 1 : here's my try/catch
try{
socket = new Socket(some_ip, some_port);
}
catch(ConnectException e) {
e.printStackTrace();
}
Edit 2 : here's the entire code
private void getUDPData() throws IOException {
class ProcessUPDTask extends AsyncTask<String, Void, Socket> {
private Exception exception;
private Socket socket;
public ProcessUPDTask() throws IOException {
}
private void runThread(){
new Thread() {
public void run() {
Toast.makeText(activity, "Own Message", Toast.LENGTH_LONG).show();
}
}.start();
}
protected Socket doInBackground(String... urls) {
try {
try{
socket = new Socket(some_ip, some_port);
socket.setSoTimeout(1500);
}
catch(IOException e) {
e.printStackTrace();
}
Log.d("TAG","this line is reached");
while(true){
try {
dataInputStream = new DataInputStream(socket.getInputStream());
dataOutputStream = new DataOutputStream(socket.getOutputStream());
System.out.println("ip: " + socket.getInetAddress());
System.out.println("message: " + dataInputStream.readUTF());
dataOutputStream.writeUTF("Hello!");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally{
if( socket!= null){
try {
socket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if( dataInputStream!= null){
try {
dataInputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if( dataOutputStream!= null){
try {
dataOutputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
} catch (Exception e) {
this.exception = e;
e.printStackTrace();
return null;
}
}
protected void onPostExecute(Socket socket) {
// TODO: check this.exception
// TODO: do something with the feed
}
}
new ProcessUPDTask().execute();
}

Try this
try {
Socket socket = new Socket(IP_ADDRESS, PORT);
socket.setSoTimeout(1500);
} catch (IOException ex) {
Log.e("Connection Error",String.valueOf(ex));
}
Replace your code with this and wait some seconds(60 sec for now) you can see the error toast..
private void getUDPData() throws IOException {
class ProcessUPDTask extends AsyncTask<String, Void, Socket> {
private Exception exception;
private Socket socket;
public ProcessUPDTask() throws IOException {
}
protected Socket doInBackground(String... urls) {
try {
try {
socket = new Socket("192.168.1.101", 1234);
socket.setSoTimeout(1500);
} catch (IOException e) {
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(MainActivity.this, "Error", Toast.LENGTH_LONG).show();
}
});
}
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(MainActivity.this, "Reached", Toast.LENGTH_LONG).show();
}
});
while (true) {
try {
dataInputStream = new DataInputStream(socket.getInputStream());
dataOutputStream = new DataOutputStream(socket.getOutputStream());
System.out.println("ip: " + socket.getInetAddress());
System.out.println("message: " + dataInputStream.readUTF());
dataOutputStream.writeUTF("Hello!");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (dataInputStream != null) {
try {
dataInputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (dataOutputStream != null) {
try {
dataOutputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
} catch (Exception e) {
this.exception = e;
e.printStackTrace();
return null;
}
}
protected void onPostExecute(Socket socket) {
// TODO: check this.exception
// TODO: do something with the feed
}
}
new ProcessUPDTask().execute();
}

You can configure this and use transData() between connectivity.
private void transData(int sending_msg_int) throws IOException {
String sending_msg = Integer.toString(sending_msg_int);
SocketAddress socketAddress = new InetSocketAddress(ip, Data.Port);
DatagramSocket ds = new DatagramSocket();
byte[] buffer = sending_msg.getBytes();
DatagramPacket dp = new DatagramPacket(buffer, buffer.length,
socketAddress);
ds.send(dp);
ds.close();
}

Simple progress dialog onClick and hide when finish operation

I want show a progress dialog (with a progressbar or circle this is indifferent to me) when i click the button. Actually i can show it but i don't know how hide it after finish the operations inside at onclick. This is the code:
copy.setOnClickListener(new OnClickListener() {
public void onClick(View v){
ProgressDialog progressDialog = new ProgressDialog(getActivity());
progressDialog.setProgressStyle(R.style.NewDialog);
progressDialog.setMessage("Loading...");
progressDialog.show();
String datafolder = Environment.getDataDirectory().getAbsolutePath()+File.separator+"app";
File customfolder=new File(Environment.getExternalStorageDirectory().getAbsolutePath().toString()+File.separator+"BackupApps");
String comando = "cp -r /data/app /sdcard/BackupApps";
Process suProcess = null;
try {
suProcess = Runtime.getRuntime().exec("su");
} catch (IOException e3) {
// TODO Auto-generated catch block
e3.printStackTrace();
}
DataOutputStream os = new DataOutputStream(suProcess.getOutputStream());
try {
os.writeBytes(comando + "\n");
} catch (IOException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
}
try {
os.flush();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
os.writeBytes("exit\n");
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
os.flush();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
How can i do it?

First define inner class like this in your class
class SaveTask extends AsyncTask<Void, Void, Void> {
ProgressDialog progressDialog;
#Override
protected void onPreExecute() {
super.onPreExecute();
progressDialog = new ProgressDialog(getActivity());
progressDialog.setProgressStyle(R.style.NewDialog);
progressDialog.setMessage("Loading...");
progressDialog.show();
}
#Override
protected Void doInBackground(Void... params) {
String datafolder = Environment.getDataDirectory()
.getAbsolutePath() + File.separator + "app";
File customfolder = new File(Environment
.getExternalStorageDirectory().getAbsolutePath().toString()
+ File.separator + "BackupApps");
String comando = "cp -r /data/app /sdcard/BackupApps";
Process suProcess = null;
try {
suProcess = Runtime.getRuntime().exec("su");
} catch (IOException e3) {
// TODO Auto-generated catch block
e3.printStackTrace();
}
DataOutputStream os = new DataOutputStream(
suProcess.getOutputStream());
try {
os.writeBytes(comando + "\n");
} catch (IOException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
}
try {
os.flush();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
os.writeBytes("exit\n");
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
os.flush();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
if (progressDialog != null) {
if (progressDialog.isShowing()) {
progressDialog.dismiss();
}
}
}
}
call this in your onClick() like this..
here we haven't passing any data to AsynchTask so here i am passing null
copy.setOnClickListener(new OnClickListener() {
public void onClick(View v){
SaveTask task = new SaveTask();
task.execute(null, null, null);
}

Start a AsyncTask on onClick method like this:
public void onClick(View v){
YourAsyncTask asyncTask = new AsyncTask(context);
asyncTask.execute();
}
And in your AsyncTask create a ProgressDialog on onPreExecute(), do your stuff in doInBackground() and dismiss the ProgressDialog on onPostExecute():
public class YourAsyncTask extends AsyncTask<Void, Void, Void> {
private Context ctx;
private ProgressDialog progressDialog;
public YourAsyncTask(Context ctx) {
this.ctx = ctx;
}
#Override
protected void onPreExecute() {
ProgressDialog progressDialog = new ProgressDialog(getActivity());
progressDialog.setProgressStyle(R.style.NewDialog);
progressDialog.setMessage("Loading...");
progressDialog.show();
}
#Override
protected Void doInBackground(Void... params) {
String datafolder = Environment.getDataDirectory().getAbsolutePath()+File.separator+"app";
File customfolder=new File(Environment.getExternalStorageDirectory().getAbsolutePath().toString()+File.separator+"BackupApps");
String comando = "cp -r /data/app /sdcard/BackupApps";
Process suProcess = null;
try {
suProcess = Runtime.getRuntime().exec("su");
} catch (IOException e3) {
// TODO Auto-generated catch block
e3.printStackTrace();
}
DataOutputStream os = new DataOutputStream(suProcess.getOutputStream());
try {
os.writeBytes(comando + "\n");
} catch (IOException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
}
try {
os.flush();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
os.writeBytes("exit\n");
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
os.flush();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
#Override
protected void onPostExecute(Void res) {
progressDialog.hide();
progressDialog.dismiss();
}

don't foget to declare the progressDialog global variable
#Override
public void onClick(View v) {
AsyncTask<Void, Void, Void> task = new AsyncTask<Void, Void, Void>() {
#Override
protected void onPreExecute() {
progressDialog = new ProgressDialog(getActivity());
progressDialog.setProgressStyle(R.style.NewDialog);
progressDialog.setMessage("Loading...");
progressDialog.show();
}
#Override
protected Void doInBackground(Void... arg0) {
String datafolder = Environment.getDataDirectory().getAbsolutePath()+File.separator+"app";
File customfolder=new File(Environment.getExternalStorageDirectory().getAbsolutePath().toString()+File.separator+"BackupApps");
String comando = "cp -r /data/app /sdcard/BackupApps";
Process suProcess = null;
try {
suProcess = Runtime.getRuntime().exec("su");
} catch (IOException e3) {
// TODO Auto-generated catch block
e3.printStackTrace();
}
DataOutputStream os = new DataOutputStream(suProcess.getOutputStream());
try {
os.writeBytes(comando + "\n");
} catch (IOException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
}
try {
os.flush();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
os.writeBytes("exit\n");
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
os.flush();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void result) {
if (progressDialog!=null) {
progressDialog.dismiss();
}
}
};
task.execute((Void[])null);
}

Add progressDialog.dismiss(); in the last line on onClick and in all the catch so that it will disappear even if an Exception is thrown

TCP in Android - ObjectOutputStream writeObject failure

I'm trying to send an Object from my phone to my PC(Windows) using a TCP socket via WiFi. When I try the same code between two PCs, it works without any error. But when I put the client code to the android device, it fails to send date using writeObject method. But writeUTF command works. It gives the "Software caused connection abort: recv failed" error. Below is the Code. Please help..
Server(in PC):
public class Test {
public static void main(String arg[]) {
ServerSocket serverSocket = null;
Socket socket = null;
ObjectInputStream in = null;
ObjectOutputStream out = null;
try {
serverSocket = new ServerSocket(8888);
System.out.println("Listening :8888");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
while (true) {
try {
socket = serverSocket.accept();
in = new ObjectInputStream(socket.getInputStream());
out = new ObjectOutputStream(socket.getOutputStream());
out.flush();
System.out.println("ip: " + socket.getInetAddress());
Message msg = (Message) in.readObject(); //Message captured from chat client.
System.out.println(msg.type + " message received from " + msg.sender + " Containing " + msg.content);
out.writeObject(new Message("Ack", "Server", "Message Received", "Client"));
out.flush();
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
}
finally {
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (in != null) {
try {
in.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (out != null) {
try {
out.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}
}
Client (in Android Device):
public class MainActivity extends Activity{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button bb=(Button)findViewById(R.id.button1);
bb.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
new Send().execute();
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
private class Send extends AsyncTask<Void, Void, Void> {
Socket socket = null;
ObjectOutputStream out = null;
ObjectInputStream in = null;
protected Void doInBackground(Void... arg0) {
try {
socket = new Socket("192.168.43.92", 8888); //use the IP address of the server
out = new ObjectOutputStream(socket.getOutputStream());
out.flush();
out.writeObject(new Message("Chat", "Server", "Hello World", "Server")); //This method is used to write something to the server.
out.flush();
Message msg = (Message) in.readObject();
System.out.println(msg.type + " message received from " + msg.sender + " Containing " + msg.content);
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally {
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (out != null) {
try {
out.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (in != null) {
try {
in.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
return null;
}
protected void onProgressUpdate(Integer... progress) {
//setProgressPercent(progress[0]);
}
protected void onPostExecute(Long result) {
//showDialog("Downloaded " + result + " bytes");
}
}
}
Message(in Both Sides):
public class Message implements Serializable{
private static final long serialVersionUID = 1L;
public String type, sender, content, recipient;
public Message(String type, String sender, String content, String recipient){
this.type = type; this.sender = sender; this.content = content; this.recipient = recipient;
}
#Override
public String toString(){
return "{type='"+type+"', sender='"+sender+"', content='"+content+"', recipient='"+recipient+"'}";
}
}

Is the network between the client and server setup properly via your WiFi? Download one of those ping & telnet test apps and use it to test your network connection.
Telnet is a useful TCP debugging app. If you have a server listening on 11.22.33.44 port 1234, you should be able to telnet 11.22.33.44 1234

Maybe, you need to add this functions into Message class:
private void writeObject(java.io.ObjectOutputStream stream)
throws IOException {
stream.writeObject(type);
stream.writeObject(sender);
stream.writeObject(content);
stream.writeObject(recipient);
}
private void readObject(java.io.ObjectInputStream stream)
throws IOException, ClassNotFoundException {
type = (String) stream.readObject();
sender = (String) stream.readObject();
content = (String) stream.readObject();
recipient = (String) stream.readObject();
}
http://developer.android.com/reference/java/io/Serializable.html

How to get the new data update from a json url in android?

I am working in an online radio streaming project. I play the stream from a url and parsing the sound track info from another json url. All that I did is I repeatedly parse the json after every 10 seconds thats why when the sound track is changing I can get the track info of that specific track. But the json file is being updated 30+ sec before the track changes, thats why sometimes there is a noticeable dissimilarity between the track and the track info.
Here is my asyncTask class where I am playing the stream.
public class RadioPlayer extends AsyncTask<String, Void, Void> {
MediaPlayer mediaPlayer = new MediaPlayer();
#Override
protected void onPreExecute() {
}
#Override
protected Void doInBackground(String... params) {
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
try {
mediaPlayer.setDataSource(params[0]);
mediaPlayer.prepare();
} catch (IllegalArgumentException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (SecurityException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IllegalStateException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
// might take long! (for buffering, etc)
mediaPlayer.start();
return null;
}
#Override
protected void onPostExecute(Void result) {
}
and here is the handler where I am updating the track info after every 10 seconds:
private void getSongStatistics() {
r = new Runnable() {
public void run() {
try {
title = tsp.parseInitiator();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
Log.i("title", title);
try {
String[] subTitles = title.split("-");
tvTitle.setText(subTitles[1]);
tvArtist.setText(subTitles[0]);
} catch (Exception e) {
tvArtist.setText(title);
}
handler.postDelayed(this, 10000);
}
}
};
handler.postDelayed(r, 10000);
}
Is there any solution by which I may get rid of this weird problem?

Use push instead of polling to update data.

Unable to send message from PC and mobilephone using socket communication

this is my task:to connect PC and mobile phone using socket communication.i have a problem in sending the message i type in the socket connection. i use eclipse to run the program from PC to phone. i type in my text on the textbox. when i press the send button, i could not send the text and let it reflect on the phone. the program codes do not have errors anymore.
this is the link i got for the codes: http://android-er.blogspot.sg/2011/01/simple-communication-using.html
these are my codes with no errors:
public class AndroidClient extends Activity {
EditText textOut;
TextView textIn;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.socket_client);
textOut = (EditText)findViewById(R.id.textout);
Button buttonSend = (Button)findViewById(R.id.send);
textIn = (TextView)findViewById(R.id.textin);
buttonSend.setOnClickListener(buttonSendOnClickListener);
}
Button.OnClickListener buttonSendOnClickListener
= new Button.OnClickListener(){
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Socket socket = null;
DataOutputStream dataOutputStream = null;
DataInputStream dataInputStream = null;
try {
socket = new Socket("10.217.137.207", 8888);
dataOutputStream = new DataOutputStream(socket.getOutputStream());
dataInputStream = new DataInputStream(socket.getInputStream());
dataOutputStream.writeUTF(textOut.getText().toString());
textIn.setText(dataInputStream.readUTF());
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally{
if (socket != null){
try {
socket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (dataOutputStream != null){
try {
dataOutputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (dataInputStream != null){
try {
dataInputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}};
}

It seems from the code that you are trying to open a socket connection from your device to external device with given IP [10.217.137.207].
This code should work only if you use the ip of device you are testing it on.
Try to use 127.0.0.1
dataInputStream.readUTF();
will return anything if and only if it is being written from device with IP [10.217.137.207].
If you are using your device's IP address then
dataInputStream.readUTF();
will return all that you write with
dataOutputStream.writeUTF()
I believe it must be clear.