Hi,
I have a main class activity that does the task of sending control to
other activities on click of a button. I am also starting a thread in
the main class. This thread basically sets up a connection with the
server and is active throughout the lifetime of the application.
I have two functions in the thread class, send and receive data from
server. Therefore, when the other activities need to send/receive data
from server, they use those particular functions.
First of all please let me know if what I am trying to do is fine as
per the architecture of the operating system. If its fine, when I try
to run the code, the app crashes and i see a NullPointerException and
a RuntimeException in the DDMS log.
Could some one please help me out in this or suggest a better way to
implement the concept.
Also, please be assured that, the other functionality of the code
works perfectly fine.
The main class code is as below
[code]
package com.getfriends;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.StringTokenizer;
import android.app.Activity;
import android.app.ListActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
public class GetFriendsActivity extends Activity{
private MyFriend obj= new MyFriend();
List<MyFriend> listOfFriends = new ArrayList<MyFriend>();
int i=0;
private String FName=null;
private String LName=null;
private String Latitude=null;
private String Longitude=null;
private String TimeStamp=null;
public static ArrayList<String> namesArray=new
ArrayList<String>();
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Thread cThread= null;
try{
cThread = new Thread(new ConnectSocket());
cThread.start();}
catch (Exception e){
Toast.makeText(getBaseContext(),
"Unable to start thread",
Toast.LENGTH_LONG).show();
}
Toast.makeText(getBaseContext(),
"Starting",
Toast.LENGTH_LONG).show();
try {
getFriendsList();
} catch (Exception e) {
Toast.makeText(getBaseContext(),
"Unable to fetch friend list:"+e.getMessage(),
Toast.LENGTH_LONG).show();
e.printStackTrace();
}
try {
displayFriendsList();
} catch (Exception e) {
Toast.makeText(getBaseContext(),
"Unable to display friend list:"+e.getMessage()
+e.getLocalizedMessage(),
Toast.LENGTH_LONG).show();
e.printStackTrace();
}
ConnectSocket socket = new ConnectSocket();
socket.sendData("ABCDEF");
String k = socket.recieveData();
Toast.makeText(getBaseContext(),
"Recieved from server:"+k,
Toast.LENGTH_LONG).show();
}
private void getFriendsList() {
String line[] = new String[3];
line[0]=
"Abdul#Raqeeb#23.44#34.44#4.45";
line[1]= "Abdul#Azeez#33.44#44.44#5.45";
line[2]=
"Kiral#Azeez#53.44#454.44#6.45";
for(int k=0;k<=2;k++){
StringTokenizer tokens=new
StringTokenizer(line[k],"#");
try{
while(tokens.hasMoreTokens())
{
FName=tokens.nextToken();
LName=tokens.nextToken();
Latitude=tokens.nextToken();
Longitude=tokens.nextToken();
TimeStamp=tokens.nextToken();
listOfFriends.add(new
MyFriend(FName,LName,Latitude,Longitude,TimeStamp));
}
}
catch (Exception e){
Toast.makeText(this,
"Some prob
here:"+e.getLocalizedMessage(),
Toast.LENGTH_SHORT).show();
e.printStackTrace();
}
}
}
}
[/code]
The code related to the thread is
[code]
package com.getfriends;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.net.Socket;
import android.util.Log;
public class ConnectSocket implements Runnable{
/** Called when the activity is first created. */
public String fromServer=null;
public static BufferedReader inFromServer=null;
public static Socket clientSocket=null;
public InetAddress address =null;
public static DataOutputStream outToServer=null;
@Override
public void run(){
try {
address = InetAddress.getByName("127.0.0.1");
Log.d("TCP", "C: Connecting...");
clientSocket = new Socket(address, 9999);
outToServer = new
DataOutputStream(clientSocket.getOutputStream());
inFromServer = new BufferedReader(new
InputStreamReader(clientSocket.getInputStream()));
} catch (Exception e) {
System.out.println("Not Connected to the internet");
}
}
public void sendData(String s){
try {
if(s.equals(null)) s="hello";
Log.d("TCP", "C: Sending...");
outToServer.writeBytes(s+'#');
outToServer.flush();
} catch (IOException e) {
// TODO Auto-generated catch block
Log.d("TCP", "unable to send msg");
e.printStackTrace();
}
}
public String recieveData(){
try {
fromServer = inFromServer.readLine();
if(fromServer.equals(null)) fromServer="bad luck";
} catch (IOException e) {
// TODO Auto-generated catch block
Log.d("TCP", "unable to send msg");
e.printStackTrace();
}
return fromServer;
}
}
[/code]
Many thanks,
Raqeeb
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