Develop Reference

Server doesn't seem to receive Client message ANDROID

I am working on a chat client application and I have made a server. I managed to make the client connect to the server, but then when I send a message to the server, there's no reaction from the server.
Here is the part of the code of my server that is not working
class ClientConnect implements Runnable {
private DataInputStream in = null;
private DataOutputStream out = null;
Socket client;
ClientConnect(Socket client) {
try {
this.client = client;
/* obtain an input stream to this client ... */
in = new DataInputStream (client.getInputStream());
/* ... and an output stream to the same client */
setOut(new DataOutputStream (client.getOutputStream()));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void run() {
String msg, response;
ChatServerProtocol protocol = new ChatServerProtocol(this);
try {
while (true) {
if (in.available() > 0){
msg = in.readUTF();
response = protocol.process(msg);
getOut().writeBytes("SERVER: " + response);
}
}
} catch (IOException e) {
System.err.println(e);
} finally {
// The connection is closed for one reason or another
try {
client.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public void sendMsg(String msg) {
try {
getOut().writeBytes(msg);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public DataOutputStream getOut() {
return out;
}
public void setOut(DataOutputStream out) {
this.out = out;
}
}
And here is the client :
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
String response = null;
EditText nicknameField = (EditText)findViewById(R.id.nicknameField);
EditText passwordField = (EditText)findViewById(R.id.passwordField);
nickname = nicknameField.getText().toString();
password = passwordField.getText().toString();
switch(v.getId()){
case R.id.signin:
new SendMessage(this).execute("SIGNUP " + nickname + " " + password );
break;
case R.id.signup:
new SendMessage(this).execute("SIGNUP " + nickname + " " + password );
break;
}
}
private String onPostExecuteSendMessage() {
return null;
}
public void showMessage(String response) {
Builder builder = new AlertDialog.Builder(this);
builder.setMessage(response);
AlertDialog dialog = builder.create();
dialog.show();
}
public void getClientSocket(Socket client) {
this.client = client;
try {
out = new DataOutputStream (client.getOutputStream());
in = new DataInputStream (client.getInputStream());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public DataOutputStream getOut() {
// TODO Auto-generated method stub
return this.out;
}
public DataInputStream getIn() {
// TODO Auto-generated method stub
return this.in;
}
public void goMenuChat() {
// TODO Auto-generated method stub
Intent intent = new Intent(this, MenuChatActivity.class);
startActivity(intent);
}
}
Also I used an Asynctask to send message from the client :
package client.chatclient;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.lang.ref.WeakReference;
import android.os.AsyncTask;
public class SendMessage extends AsyncTask<String, String, String> {
private static final String msg_OK = "OK";
private static final String msg_NICK_IN_USE = "NICK IN USE";
private static final String msg_UNKNOWN_CMD = "UNKNOWN CMD";
private static final String msg_INVALID = "INVALID COMMAND";
private static final String msg_SEND_FAILED = "FAILED TO SEND";
private static final String msg_INCORRECT_IDS = "INCORRECT IDS";
private static final String msg_DISCONNECT = "DISCONNECT";
private WeakReference<MainActivity> activity;
private String message;
private String response = "";
private DataOutputStream out;
private DataInputStream in;
public SendMessage(MainActivity act){
super();
activity = new WeakReference<MainActivity>(act);
}
protected String doInBackground(String... message) {
this.message = message[0];
this.out = activity.get().getOut();
this.in = activity.get().getIn();
try {
out.writeBytes(this.message);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
response = convertStreamToString(this.in);
return response;
}
protected void onPostExecute(String response) {
if ((response == msg_INCORRECT_IDS) || (response == msg_NICK_IN_USE)){
activity.get().showMessage(response);
}
else if (response == msg_OK){
activity.get().goMenuChat();
}
}
private static String convertStreamToString(DataInputStream in) {
/*
* To convert the InputStream to String we use the
* BufferedReader.readLine() method. We iterate until the BufferedReader
* return null which means there's no more data to read. Each line will
* appended to a StringBuilder and returned as String.
*/
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
} catch (IOException e) {
e.printStackTrace();
}
return sb.toString();
}
}
I send my message from the client by clicking on a button then it goes to the SendMessage class, and send the message to the server and normally the server should receive my message in the loop "while (true)..." and sends back a response according to the protocol that I've implemented.
I really don't know what is wrong. If you know how to solve this issue or have some solutions, please tell me ! If you want more details, ask me ! :)
Thank you very much !
EDIT:
I instanciated my ClientConnect here
public class ChatServer {
private static int port = 8080;
public static void main (String[] args) throws IOException {
ServerSocket server = new ServerSocket(port); /* start listening on the port */
System.out.println( "Listening on "+ server );
Socket client = null;
while(true) {
try {
client = server.accept();
System.out.println( "Connection from " + client );
/* start a new thread to handle this client */
Thread t = new Thread(new ClientConnect(client));
t.start();
} catch (IOException e) {
System.err.println("Accept failed.");
System.err.println(e);
System.exit(1);
server.close();
}
}
}
}
EDIT: I found where the problem is. I put some log() statements as you said
log.d(null,"beforeconvert")
try {
log.d(null,"convert")
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
} catch (IOException e) {
log.d(null,"errorconvert")
e.printStackTrace();
}
After that in logcat, it just shows "beforeconvert". I don't really know what the problem is ? while ((line = reader.readLine()) != null) is surely the problem. When I use the debugger step by step in eclipse, it stops at this line and doesn't even go inside the loop.
EDIT : I REALLY don't know why, but when I quit the emulator when running my app, it shows everything.
Listening on ServerSocket[addr=0.0.0.0/0.0.0.0,localport=8080]
Connection from Socket[addr=/127.0.0.1,port=56646,localport=8080]
client connected
msg received
error !
SIGNUP Nickname Password
SIGNUP Nickname Password
msg converted
OK
java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at java.io.DataInputStream.read(Unknown Source)
at sun.nio.cs.StreamDecoder.readBytes(Unknown Source)
at sun.nio.cs.StreamDecoder.implRead(Unknown Source)
at sun.nio.cs.StreamDecoder.read(Unknown Source)
at java.io.InputStreamReader.read(Unknown Source)
at java.io.BufferedReader.fill(Unknown Source)
at java.io.BufferedReader.readLine(Unknown Source)
at java.io.BufferedReader.readLine(Unknown Source)
at server.ClientConnect.convertStreamToString(ChatServer.java:357)
at server.ClientConnect.run(ChatServer.java:304)
at java.lang.Thread.run(Unknown Source)
java.net.SocketException: Connection reset by peer: socket write error

When you are writing data to output stream in the end you need to flush
this.out.flush();
I think this is why the data is not sent and received
Hope that helps.
Edit:
Let me try to explain in general idea..
When you are opening a socket you have a connection to another machince.
So the
in.available();
and
socket.accpet();
Should work.. once you are writing into outputstream you must flush in order to see the data(or close, i think it flushes before it get closed).
Anyway i attach a link to an example.. You should try this one, Or look at parts you have problem with..
http://examples.javacodegeeks.com/android/core/socket-core/android-socket-example/

Android stream m3u radio fails on mobile data (g3/mobile data)

Not very easy to explain:
I have this app for streaming online radio. The problem was first with m3u format (which android somehow cannot normally stream like pls), so I have to parse the url with this ParserM3UToURL (that I found somewhere)... like this:
Uri u = Uri.parse(ParserM3UToURL.parse(STREAM_URL, sdkVersion, c));
player = MediaPlayer.create(c, u);
Mostly it works ok but it has one bug...
I'm testing this on two devices one old 2.2.2. (api level 17), other 4.3 (api level 23). Older device works fine. It can stream radio over wifi or mobile data, but the newer device has some problem with streaming over mobile data (on wifi it works ok). The application crashes because the parse function returns null: http://pastebin.com/ghbAqGzM
And I assume there are many more phones with 4.x than 2.x android. Which of course is very painful for me. Somehow I have to fix this.. So I really hope somebody will have some clue about this. I hope my explanation was not to confusing...
This is the ParserM3UToURL.parse() function:
public static String parse(String paramString, int sdkVersion, Context c)
{
try
{
StrictModeWrapper.init(c);
HttpURLConnection localHttpURLConnection = (HttpURLConnection)new URL(paramString).openConnection();
InputStream localInputStream = localHttpURLConnection.getInputStream();
BufferedReader localBufferedReader = new BufferedReader(new InputStreamReader(localInputStream));
StringBuffer localStringBuffer = new StringBuffer();
while (true)
{
String str = localBufferedReader.readLine();
if (str == null)
{
localHttpURLConnection.disconnect();
localBufferedReader.close();
localInputStream.close();
break;
}
if (str.contains("http"))
{
localHttpURLConnection.disconnect();
localBufferedReader.close();
localInputStream.close();
return str;
}
localStringBuffer.append(str);
}
}
catch (Exception e)
{
e.printStackTrace();
}
return null;
}

Below is what i worked on to stream radio (m3Urls). The example below uses a service. When the service is started, the url is parsed. Note that in the onPostExecute, parsed file is prepared. Once the file is prepared(completed buffering), the file is played/started and stopped upon completion.
public class BackgroundRadioService extends Service implements
OnCompletionListener, OnPreparedListener{
MediaPlayer mediaPlayer;
#Override
public void onCreate() {
mediaPlayer = new MediaPlayer();
mediaPlayer.setOnCompletionListener(this);
mediaPlayer.setOnPreparedListener(this);
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
parseM3uUrlAndPrepare("http://listen.radionomy.com/andalousse.m3u");
return START_STICKY;
}
private void parseM3uUrlAndPrepare(final String url){
AsyncTask<String, Integer, String> asyn = new AsyncTask<String, Integer, String>(){
HttpClient httpClient;
HttpGet getRequest;
HttpResponse httpResponse = null;
String filePath = "";
#Override
protected void onPreExecute() {
super.onPreExecute();
httpClient = new DefaultHttpClient();
getRequest = new HttpGet(url);
}
#Override
protected String doInBackground(String... params) {
try {
httpResponse = httpClient.execute(getRequest);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if(httpResponse != null)
if (httpResponse.getStatusLine().getStatusCode() != HttpStatus.SC_OK) {
// ERROR MESSAGE
} else {
InputStream inputStream = null;
try {
inputStream = httpResponse.getEntity().getContent();
} catch (IllegalStateException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
String line;
try {
while ((line = bufferedReader.readLine()) != null) {
//Log.v("PLAYLISTLINE", "ORIG: " + line);
if (line.startsWith("#")) { // Metadata
} else if (line.length() > 0) {
filePath = "";
if (line.startsWith("http://")) { // Assume it's a full URL
filePath = line;
} else { // Assume it's relative
try{
filePath = getRequest.getURI().resolve(line).toString();
}catch(IllegalArgumentException e){
}catch(Exception e){
}
}
}
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
inputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return filePath;
}
#Override
protected void onPostExecute(String filePath) {
try {
mediaPlayer.setDataSource(filePath);
mediaPlayer.prepareAsync(); //this will prepare file a.k.a buffering
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
};
asyn.execute("");
}
#Override
public void onPrepared(MediaPlayer mp) {
// TODO Auto-generated method stub
mediaPlayer.start();
}
#Override
public void onCompletion(MediaPlayer mp) {
mediaPlayer.stop();
}
}//end of Service class declaration
Note: This ignores playlists hence assumes the m3u parsed will return only one file. Let me know if you would like to handle playlists so I modify my answer :)

I solved it thanks to this question's comments: POST request failing when in 3G
The problem was actually with proxies on 3G. So if proxies are disabled, no weird http requests.
I modified my code a little. Thanks to Nana's answer I no longer need a m3u parser. I also no longer use HttpClient but HttpURLConnection instead. So when calling URL.openConnection() I add the Proxy.NO_PROXY parameter to that function and bam!
So the solution is "use HttpURLConnection not HttpClient and add NO_PROXY parameter":
conn = (HttpURLConnection) the_url.openConnection( Proxy.NO_PROXY );

Retrieving data from a website not working (Android)

I use the following class to retrieve data from a website:
public class GetMethodEx {
public String getInternetData() throws Exception {
BufferedReader in = null;
String data = null;
try {
HttpClient client = new DefaultHttpClient();
URI website = new URI("http://www.google.com");
HttpGet request = new HttpGet();
request.setURI(website);
HttpResponse response = client.execute(request);
in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
StringBuffer sb = new StringBuffer("");
String l = "";
String nl = System.getProperty("line.separator");
while ((l = in.readLine()) != null) {
sb.append(l + nl);
}
in.close();
data = sb.toString();
return data;
} finally {
if (in != null) {
try {
in.close();
return data;
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
}
And the following class uses the above class to print the retrieved data on the screen:
public class HttpExample extends Activity {
TextView httpStuff;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.httpex);
httpStuff = (TextView) findViewById(R.id.tvHttp);
GetMethodEx test = new GetMethodEx();
String returnedData = null;
try {
returnedData = test.getInternetData();
httpStuff.setText(returnedData);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
I have set the "httpStuff" TextView to "loading..." in the "httpex" xml. Now the problem I am facing is that when I run the app, it is stuck at this "loading..." forever. Any ideas why?
Thanks.
PS: I have added the permission "android.permission.INTERNET" in the manifest.
EDIT: Actually I have a duplicate question which has the correct solution. Anyway, thanks!

Make sure to check LogCat to look for potential error messages. I'm guessing you didn't request the Internet permission in your AndroidManifest.xml.
Add
<uses-permission android:name="android.permission.INTERNET" />
outside the application tag in your AndroidManifest.xml
Edit:
Also, you should avoid running network requests on the UI thread. On later versions of android (Honeycombe and later I believe) you'll get a NetworkOnMainThreadException, which could also cause the issue you're facing.
Try using an AsyncTask to run this request. See the answer here:
How to fix android.os.NetworkOnMainThreadException?

How to Get Specific Information From the Internet In Android App

im pretty new In Android App development, I need some help.
Im creating this simple dictionary application that prompts the user to enter a word and after a button press it will take that word to the internet, probably wikipedia.org and return that information to the User.
I used XML to develop the app textfield and button. And created a piece of text (ansa) which will be set to whatever the answer is using the OnClickListener,
I do not want to set up a webview
I just want the text to be set to the dictionary answer.
Here's what i have been able to do so far. There is this class to get data from google.
public class GetMethod {
public String getInternetData() throws Exception{
BufferedReader in = null;
String data = null;
try{
HttpClient client = new DefaultHttpClient();
URI website = new URI("http://www.google.com");
HttpGet request = new HttpGet();
request.setURI(website);
HttpResponse response = client.execute(request);
in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
StringBuffer sb = new StringBuffer("");
String l = "";
String nl = System.getProperty("line.separator");
while((l = in.readLine()) !=null){
sb.append(l + nl);
}
in.close();
data = sb.toString();
return data;
}finally{
if (in !=null){
try{
in.close();
return data;
}catch(Exception e){
e.printStackTrace();
}
}
}
}
And Another class where the XML is implemented
public class Dictionary extends Activity {
TextView ansa;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.dictionary);
Button Search = (Button) findViewById(R.id.search);
ansa = (TextView) findViewById(R.id.ansa);
final GetMethod test = new GetMethod();
Search.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
String returned;
try {
returned = test.getInternetData();
ansa.setText(returned);
} catch (Exception e) {
ansa.setText("Failed");
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
}
}
When it executes I get the whole website's HTML
So I need help on how to take the user's word to the wiki website, and get only the text of the ansa, probably parse and store it to some string.
Thank You Alot.

You can use an API like Google Dictionary or dictionary.com.
But you will have to implement the HTTP client and parse the response. And then show the desired data .

how to ping the server in every time limit using url

i have code for hitting url but it hit only once when i run the progrm i want it hit automaticly in every 5 min. for checking the status how to do it....actually i am new in android and java so pls explain with example...v.v. thanks in advance.....
public class Activity2
{
public static String getData() {
String data = null;
try {
URL url = new URL("http://qrrency.com/mobile/j2me/cab/CabRequestStatus.php?requestid=666");
BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
int m=0;
StringBuffer buffer=new StringBuffer();
String str1 = " ";
while ((m=in.read())!=-1)
{
buffer.append((char)m);
str1=str1+(char)m;
cabbookingapplication.resp =str1;
data=cabbookingapplication.resp;
}
in.close();
} catch (MalformedURLException e)
{
} catch (IOException e)
{
}
return data;

you have to use the timer after every 5 min it will hit the Url which u want & will do what u want.