This question already has answers here:
Android check internet connection [duplicate]
(20 answers)
Closed 8 years ago.
I am creating android app that call rest services made by me on server and server is ruuning live but due to internet connectivity issues some time my application runs successfully but sometime it crashes. The code for my connection class is as
public class CommunicationClass {
#SuppressWarnings("unused")
private static final String TAG = null;
public String Domain;
public HttpClient client;
public HttpPost datapost;
public HttpResponse response;
public BufferedReader reader;
public StringBuilder builder;
public JSONTokener tokener;
public JSONObject finalResult;
List<NameValuePair> namevaluepairs = new ArrayList<NameValuePair>(10);
public void setClient() {
// TODO Auto-generated method stub
client = new DefaultHttpClient();
System.out.println("Created http client");
}
public void setDomain(String st) {
// TODO Auto-generated method stub
Domain = st;
System.out.println("Domain has been set");
}
public void setResponse(){
response=null;
System.out.println("Response has been initalized by null");
}
public void setStringBuilder(){
builder = new StringBuilder();
}
public void setreader(){
try {
reader = new BufferedReader(new InputStreamReader(this.response.getEntity().getContent(), "UTF-8"));
System.out.println("Setting the contents of the Reader");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
System.out.println("In the UnsupportedEncodingException catch of the Reader");
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
System.out.println("In the IllegalStateException catch of the Reader");
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
System.out.println("In the IOException catch of the Reader");
e.printStackTrace();
}
}
public void startpost(String str){
datapost=new HttpPost(str);
System.out.println("Created the httppost domain");
}
public void insertdata(String tag,String value){
namevaluepairs.add(new BasicNameValuePair(tag,value));
System.out.println("Added the parameter "+tag);
}
public void trydata(){
try {
this.datapost.setEntity(new UrlEncodedFormEntity(this.namevaluepairs));
System.out.println("Setting the entity");
try {
this.response = this.client.execute(this.datapost);
System.out.println("executing the client");
if(this.response != null){
System.out.println("i am in if of this.response!=null");
}
else{
System.out.println("i am in else of this.response!=null");
}
System.out.println("in response try box");
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
System.out.println("in ClientProtocolException Catch box");
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
System.out.println("in IOException Catch box");
e.printStackTrace();
}
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
System.out.println("in UnSupported Catch box");
e.printStackTrace();
}
}
public void readresponse(){
try {
for (String line = null; (line = reader.readLine()) != null;) {
builder.append(line).append("\n");
}
System.out.println(this.builder);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
tokener = new JSONTokener(builder.toString());
try {
finalResult = new JSONObject(tokener);
System.out.println("I am in try block of json final result reading");
} catch (JSONException e) {
// TODO Auto-generated catch block
System.out.println("I catch block of jsonException");
e.printStackTrace();
}
}
}
it gives me error on line trydata(); that actually execute the HTTP Client so i want to make sure that it should not crash due to internet connectivity but may throw the exception that can be caught or make toast. Guys need help on this
Thanks!
private boolean isNetworkAvailable() {
ConnectivityManager connectivityManager
= (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
return activeNetworkInfo != null && activeNetworkInfo.isConnected();
}
and dont forgett:
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
it's work great for me.
Check Internet connectivity before calling Webservice:
public static boolean isNetworkAvailable(Context context) {
ConnectivityManager connectivityManager = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetworkInfo = connectivityManager
.getActiveNetworkInfo();
return activeNetworkInfo != null && activeNetworkInfo.isConnected();
}
Although other answers are correct, they are partially correct. If you want ot know you have internet connection, not just connected to a wi-fi hotspot, you have to ping a site. This is something I found yesterday, and works if you are connected but have no internet connection via this hotspot. Basically it pings google. Use a boolean with it, and put it in the checks in the other people's answers' check.
Use this:
public static Boolean checkForInternetConnection(Context context) {
final ConnectivityManager conMgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
final NetworkInfo activeNetwork = conMgr.getActiveNetworkInfo();
if (activeNetwork != null && activeNetwork.isConnected()) {
return true;
} else {
return false;
}
}
Related
Is there any way to get client ip which is connected to android hotspot in java scoket, i have to send input values to client ip on submit
Here what i tried :
private class AttemptSubmit {
public ArrayList<String> getClientList1() {
ArrayList<String> clientList = new ArrayList<>();
BufferedReader br = null;
try {
br = new BufferedReader(new FileReader("/proc/net/arp"));
String line;
while ((line = br.readLine()) != null) {
String[] clientInfo = line.split(" +");
String mac = clientInfo[3];
if (mac.matches("..:..:..:..:..:..")) {
clientList.add(clientInfo[0]);
// TODO Auto-generated method stub
Socket socket = null;
DataOutputStream dataOutputStream = null;
DataInputStream dataInputStream = null;
try {
socket = new Socket(clientInfo[0], 8888);
dataOutputStream = new DataOutputStream(socket.getOutputStream());
dataInputStream = new DataInputStream(socket.getInputStream());
dataOutputStream.writeUTF(editUsername.getText().toString());
dataOutputStream.writeUTF(editPassword.getText().toString());
} 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();
}
}
}
}
}
} catch (java.io.IOException aE) {
aE.printStackTrace();
return null;
}
return getClientList1();
}
Submit action :
btnSubmit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
AttemptSubmit attemptSubmit= new AttemptSubmit();
attemptSubmit.getClientList1();
}
});
The problem is, when i click on submit button i'm getting this error "Unfortunately,Aqua has stooped."
I am trying to approach a problem in which I have to disable and then enable mobile data with some delay in between (reset mobile data 2G).
step 1: disable mobile data
step 2: wait till mobile data gets disabled
step 3: some delay say 2 seconds
step 4: enable mobile data
step 5: wait till mobile data gets enabled
step 6: continue with the program.....
doing some research I came up with this...
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button start = (Button)findViewById(R.id.button1);
start.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
if(!mobileDataEnabled(getApplicationContext())){
setMobileDataEnabled(getApplicationContext(),true);
Toast.makeText(getApplicationContext(), "ENABLED", Toast.LENGTH_SHORT).show();
}else{
setMobileDataEnabled(getApplicationContext(),false);
Toast.makeText(getApplicationContext(), "DISABLED", Toast.LENGTH_SHORT).show();
}
}
});
}
//the method below enables/disables mobile data depending on the Boolean 'enabled' parameter.
private void setMobileDataEnabled(Context context, boolean enabled) {
final ConnectivityManager conman = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
Class conmanClass = null;
try {
conmanClass = Class.forName(conman.getClass().getName());
final Field iConnectivityManagerField = conmanClass.getDeclaredField("mService");
iConnectivityManagerField.setAccessible(true);
final Object iConnectivityManager = iConnectivityManagerField.get(conman);
final Class iConnectivityManagerClass = Class.forName(iConnectivityManager.getClass().getName());
final Method setMobileDataEnabledMethod = iConnectivityManagerClass.getDeclaredMethod("setMobileDataEnabled", Boolean.TYPE);
setMobileDataEnabledMethod.setAccessible(true);
setMobileDataEnabledMethod.invoke(iConnectivityManager, enabled);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchFieldException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchMethodException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// below method returns true if mobile data is on and vice versa
private boolean mobileDataEnabled(Context context){
boolean mobileDataEnabled = false; // Assume disabled
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
try {
Class cmClass = Class.forName(cm.getClass().getName());
Method method = cmClass.getDeclaredMethod("getMobileDataEnabled");
method.setAccessible(true); // Make the method callable
// get the setting for "mobile data"
mobileDataEnabled = (Boolean)method.invoke(cm);
} catch (Exception e) {
// Some problem accessible private API
// TODO do whatever error handling you want here
}
return mobileDataEnabled;
}
The above code will turn on/off mobile data but it happens really quick. this quick that the mobile data doesn't even turn off actually. how do I add a delay in between and achieve the steps I mentioned above? any help would be appreciated.
thanks!
Just put
Thread.sleep(1000);
in between the code statements (before setMobileData APIs) to achieve delay. The delay parameter is in milliseconds. So change it according to your requirement.
EDIT: Try putting the delay into a handler, using this code:
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
//Whatever you want to do
}
}, 1000);
Try this may work. Use your code for turning off/on your packet data.
You should use a broadcast receiver for getting the events of connectivity.
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION);
registerReceiver(broadcastReceiver, intentFilter);
Check the below link for details
Get notified on connectivity change
public void mobiledataenable(boolean enabled) {
try {
final ConnectivityManager conman = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
final Class<?> conmanClass = Class.forName(conman.getClass().getName());
final Field iConnectivityManagerField = conmanClass.getDeclaredField("mService");
iConnectivityManagerField.setAccessible(true);
final Object iConnectivityManager = iConnectivityManagerField.get(conman);
final Class<?> iConnectivityManagerClass = Class.forName(iConnectivityManager.getClass().getName());
final Method setMobileDataEnabledMethod = iConnectivityManagerClass.getDeclaredMethod("setMobileDataEnabled", Boolean.TYPE);
setMobileDataEnabledMethod.setAccessible(true);
setMobileDataEnabledMethod.invoke(iConnectivityManager, enabled);
}
catch (Exception e)
{
e.printStackTrace();
}
}
Try (this will turn the data off then wait till it's off then on again):
setMobileDataEnabled(getApplicationContext(),false);
while(mobileDataEnabled(getApplicationContext()){
//Just wait, don't do anything
}
//Turn it on here
setMobileDataEnabled(getApplicationContext(),true);
Lemme know if i couldn't get you properly!
// first check whether it is on\off...
public void setMobileDataEnabled(Context context, boolean status) throws ClassNotFoundException, NoSuchFieldException, IllegalAccessException, NoSuchMethodException, InvocationTargetException
{
final ConnectivityManager conman = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
final Class conmanClass = Class.forName(conman.getClass().getName());
final Field connectivityManagerField = conmanClass.getDeclaredField("mService");
connectivityManagerField.setAccessible(true);
final Object connectivityManager = connectivityManagerField.get(conman);
final Class connectivityManagerClass = Class.forName(connectivityManager.getClass().getName());
final Method setMobileDataEnabledMethod = connectivityManagerClass.getDeclaredMethod("setMobileDataEnabled", Boolean.TYPE);
setMobileDataEnabledMethod.setAccessible(true);
setMobileDataEnabledMethod.invoke(connectivityManager, status);
}
I'm trying to establish a Bluetooth connection in Android 4.4 but the connect method of BluetoothSocket seems to be working strangely. My app can assume the device is already bonded, so I can connect via MAC address. The thing is that it connects perfectly and immediately the first time the device is bonded, but if I relaunch it, the connection isn't established and a timeout occurs. I do this inside a while loop until it connects, but it takes too long for a real solution or it doesn't work at all. Here's a sample of my code:
public class BluetoothManager{
private BluetoothAdapter bluetoothAdapter;
private BluetoothDevice bluetoothDevice;
private BluetoothSocket socket;
private OutputStream output;
private InputStream input;
public BluetoothManager() {
/***************/
/* Constructor */
/***************/
// lock = new Object();
bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
}
public boolean turnOnBluetooth() {
/**************************************/
/* Turn on Bluetooth an notify result */
/**************************************/
// check if bluetooth is supported
if (bluetoothAdapter == null) {
return (false);
} else {
// enable Bluetooth if not enabled yet
if (!bluetoothAdapter.isEnabled()) {
bluetoothAdapter.enable();
}
while (!bluetoothAdapter.isEnabled()) {
Log.i("Debug", "Waiting for bluetooth to turn on");
try {
Thread.sleep(500);
} catch (Exception e) {
}
}
return (true);
}
}
public boolean turnOffBluetooth() {
/***************************************/
/* Turn off Bluetooth an notify result */
/***************************************/
// check if bluetooth is supported
if (bluetoothAdapter == null) {
return (false);
} else {
// disable Bluetooth if not enabled yet
if (bluetoothAdapter.isEnabled()) {
bluetoothAdapter.disable();
}
while (bluetoothAdapter.isEnabled()) {
Log.i("Debug
Thread.sleep(500);
} catch (Exception e) {
}
}
return (true);
}
}
public boolean configureBluetooth(String MACaddress) {
/***********************************************************************/
/* Configures to the specified bluetooth device and returns the result */
/***********************************************************************/
Log.i("Debug", "Connecting to Bluetooth Device");
bluetoothDevice = bluetoothAdapter.getRemoteDevice(MACaddress);
return (true);
}
#SuppressLint("NewApi")
public void createSocket() throws NoSuchMethodException, IllegalAccessException, IllegalArgumentException, InvocationTargetException{
final UUID serialUUID = UUID
.fromString("00001101-0000-1000-8000-00805F9B34FB");
socket = null;
output = null;
input = null;
Method m = bluetoothDevice.getClass().getMethod("createInsecureRfcommSocket", new Class[] { int.class });
socket = (BluetoothSocket)m.invoke(bluetoothDevice, 1);
}
#SuppressLint("NewApi")
public void connect() throws IOException, NoSuchMethodException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {
/************************************/
/* Connects to the bluetooth device */
/************************************/
Log.i("Debug", "en connect");
while (!socket.isConnected()) { // we try until the connection is established
try {
socket.connect();
output = socket.getOutputStream();
input = socket.getInputStream();
} catch (IOException e) {
Log.i("Depuración", "Connection not established. Another run : "+e);
try {
Thread.sleep(1000);
} catch (Exception e1) {
}
}
}
}
public void terminateConnection() throws IOException {
Log.i("Debug", "terminating connection");
if(output!=null){
Log.i("Debug", "output!=null - stop streaming");
stopStreaming();
}
try {
Thread.sleep(100);
} catch (Exception e) {
}
if(input!=null){
Log.i("Debug", "input!=null");
input.close();
input=null;
}
if(output!=null){
Log.i("Depuración", "output!=null");
output.close();
output = null;
}
if(socket!=null){
Log.i("Debug", "socket!=null");
socket.close();
socket=null;
}
try {
Thread.sleep(100);
} catch (Exception e) {
}
turnOffBluetooth();
try {
Thread.sleep(100);
} catch (Exception e) {
}
try {
Thread.sleep(100);
} catch (Exception e) {
}
System.gc();
}
If I call this methods from my MainActivity, it works, but only the first time the device is bonded. If I launch the app again I get an exception trying to connect to the device in:
socket.connect();
I suspect it has something to do with the way I terminate the connection, but I can't figure it out. Here's the sequential call of the methods:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bluetoothManager = new BluetoothManager();
try {
bluetoothManager.terminateConnection();
} catch (IOException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
}
bluetoothManager.turnOffBluetooth();
bluetoothManager.turnOnBluetooth();
boolean configured = false;
while (!configured) {
Log.i("Debug", "Configuration Attemp");
configured = bluetoothManager.configureBluetooth(MACaddress);
}
Log.i("Debug", "Bluetooth Configured");
try {
bluetoothManager.createSocket();
} catch (NoSuchMethodException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IllegalAccessException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IllegalArgumentException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (InvocationTargetException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
Log.i("Depuración", "Socket created");
try {
bluetoothManager.connect();
} catch (IOException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.i("Debug", "Connected!!!!");
protected void onPause() {
Log.i("Debug", "On pause");
// TODO Auto-generated method stub
try {
bluetoothManager.terminateConnection();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
bluetoothManager = null;
System.gc();
super.onPause();
};
I've been trying to solve this for days and I still can't find a reason.
Well I'm not a Pro on this, but it looks like you should call bluetoothManager.terminateConnection(); when app is closing, lets say onDestroy, but not onCreate; I also had problems to connect, if previous connection was not terminated correctly. just try add this method to your main activity:
#Override
public void onDestroy(){
if (bluetoothManager != null){
bluetoothManager.terminateConnection();
}
super.onDestroy();
}
hope that helps.
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
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.