Sharing Data with the Class that does not extends Activity - sockets

Question

I have made a TCP client for android using socket. However, the program that I have does not allow me to dynamically input the server address. Also i cannot use intent to transfer String from MainActivity because my TcpClient.java does not extends to Activity. What logic shall I implement so that I can dynamically set server address and connect to any server I wish..
MainActivity.java
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.menu_settings:
Intent i = new Intent(this, Preferences.class);
startActivityForResult(i, RESULT_SETTINGS);
break;
}
return true;
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case RESULT_SETTINGS:
saveData();
break;
}
}
public class connectTask extends AsyncTask<String,String,TcpClient> {
#Override
protected TcpClient doInBackground(String... message) {
//we create a TCPClient object and
mTcpClient = new TcpClient(new TcpClient.OnMessageReceived() {
#Override
//here the messageReceived method is implemented
public void messageReceived(String message) {
//this method calls the onProgressUpdate
publishProgress(message);
}
});
mTcpClient.run(serverip, serverport);
return null;
}
}
//call it at Activity startup onStart() for example
public void loadData(){
int mode = Activity.MODE_PRIVATE;
SharedPreferences mySharedPreferences;
mySharedPreferences = getSharedPreferences(MYPREFS, mode);
serverip = mySharedPreferences.getString("IP", serverip);
serverport = mySharedPreferences.getInt("Port", serverport);
}
// Call it whenever you modify the values
public void saveData()
{
int mode = Activity.MODE_PRIVATE;
SharedPreferences mySharedPreferences;
mySharedPreferences = getSharedPreferences(MYPREFS, mode);
SharedPreferences.Editor editor = mySharedPreferences.edit();
editor.putString("IP", serverip);
editor.putInt("Port", serverport);
editor.commit();
Toast.makeText(getBaseContext(),
"Server Settings Saved" + serverip + serverport ,
Toast.LENGTH_LONG).show();
}
}
This is not saving the data. Its showing null0 on the Toast.Also these are the variables declared for the above code
public static final String MYPREFS = "192.168.1.3";
public String serverip;
public int serverport;
Preferences.java
package com.example.homauto;
import android.os.Bundle;
import android.preference.PreferenceActivity;
public class Preferences extends PreferenceActivity{
#SuppressWarnings("deprecation")
#Override
protected void onCreate(final Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
}
}
I am a newbie to programming..
Here is the website from where i took the references..Android TCP Connection tutorial

Answer 1

Ok, there are a couple of thing you can do in order to pass the IP and Port to the TCPClient class. For me the easiest one is to declare the run method as follows:
public void run(String srvIP, int srvPort)
{
mRun = true;
try {
//here you must put your computer's IP address.
InetAddress serverAddr = InetAddress.getByName(srvIP);
Log.e("TCP Client", "C: Connecting...");
//create a socket to make the connection with the server
Socket socket = new Socket(serverAddr, srvPort);
You must call it like this:
mTcpClient.run("ServerIP", ServerPort);
like this: mTcpClient.run("192.168.1.25", 4444);
Other possibility is to change the create method and put those parameters there,
// You have to remove the final in these variables
public static String SERVERIP = "192.168.0.102"; //your computer IP address
public static int SERVERPORT = 4444;
public TCPClient(String srvIP, int srvPort, OnMessageReceived listener) {
SERVERIP=srvIP;
SERVERPORT=srvPort;
mMessageListener = listener;
}
and you instantiate the class like this:
mTcpClient = new TcpClient(ServerIP, ServerPort, new TcpClient.OnMessageReceived()
Now, in your application (main activity) you need to put a dialog or another activity in order to ask the user for the IP and port to connect to before you launch the TCPClient class, in your case the AsyncTask.
I'd put an action bar menu and when clicked show a dialog to ask for those values.
Also, you may save the values so that you have them for future use (in MainActivity):
// call it at Activity startup onStart() for example
public void loadData()
{
int mode = Activity.MODE_PRIVATE;
SharedPreferences mySharedPreferences;
mySharedPreferences = getSharedPreferences(Typedefs.saveConfigsFileName, mode);
serverIP = mySharedPreferences.getString("IP", serverIP);
serverPort = mySharedPreferences.getInt("Port", serverPort);
}
// Call it whenever you modify the values
public void saveData()
{
int mode = Activity.MODE_PRIVATE;
SharedPreferences mySharedPreferences;
mySharedPreferences = getSharedPreferences(Typedefs.saveConfigsFileName, mode);
SharedPreferences.Editor editor = mySharedPreferences.edit();
editor.putString("IP", serverIP);
editor.putInt("Port", serverPort);
editor.commit();
}