Apps how to deal with classes in android? help please

[kwty]

Hi guys,
I'm working in a project and I want to create a class that has a cursor to retrieve the call log or contacts data and passes them to the main activity or print them or doing anything with them. The problem is when I want to deal with the getContentResolver() and StartManagingCursor(Cursor) they gave me errors. When I do the same application inside the main activity it works fine with me. I tried to extends the activity in the class the error is gone but the program isn't work. I really need to run this application in a separate class and call it inside the main activity so how can I handle this problem ???

The code is as the following:

import java.io.IOException;
import java.ibjectOutputStream;
import java.net.Socket;

import android.app.Activity;
import android.database.Cursor;
import android.os.Bundle;

public class CallLog1 {

private ObjectOutputStream out;
public CallLog1(Socket clin) throws IOException{

Socket client = clin;
// Querying for a cursor is like querying for any SQL-Database
Cursor c = getContentResolver().query(
android.provider.CallLog.Calls.CONTENT_URI,
null, null, null,
android.provider.CallLog.Calls.DATE + " DESC");
startManagingCursor(c);

// Retrieve the column-indixes of phoneNumber, date and calltype
int numberColumn = c.getColumnIndex(
android.provider.CallLog.Calls.NUMBER);
int dateColumn = c.getColumnIndex(
android.provider.CallLog.Calls.DATE);
// type can be: Incoming, Outgoing or Missed
int typeColumn = c.getColumnIndex(
android.provider.CallLog.Calls.TYPE);

// Will hold the calls, available to the cursor


// Loop through all entries the cursor provides to us.
if(c.moveToFirst()){
do{
String callerPhoneNumber = c.getString(numberColumn);
int callDate = c.getInt(dateColumn);
int callType = c.getInt(typeColumn);

String type = null;
switch(callType){
case android.provider.CallLog.Calls.INCOMING_TYPE:
type = "Incoming Call";
break;
case android.provider.CallLog.Calls.MISSED_TYPE:
type = "Missed Call";
break;
case android.provider.CallLog.Calls.OUTGOING_TYPE:
type = "Outgoing Call";
break;
}
.... bla bla bla

How can I deal with the Cursor in this case ??

With my best regards.