link listview to another activity - android-listview

Question

package com.example.libtracker;
import java.util.List;
import android.app.ListActivity;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends ListActivity {
private LibactivityMainActivity studentDBoperation;
private TextView editText1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
studentDBoperation = new LibactivityMainActivity(this);
studentDBoperation.open();
List values = studentDBoperation.getAllTriptakerActivity();
ArrayAdapter adapter = new ArrayAdapter(this,
android.R.layout.simple_list_item_1, values);
setListAdapter(adapter);
// connecting listview to another activity
try {
setContentView(R.layout.activity_main);
ListView mlistView = (ListView) findViewById(R.id.editText1);
mlistView.setAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1,
new String[] {"activity_main"}));
mlistView.setOnClickListener(new OnClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// When clicked, show a toast with the TextView text
Toast.makeText(getApplicationContext(), ((TextView) view).getText(),
Toast.LENGTH_SHORT).show();
String sText = ((TextView) view).getText().toString();
Intent intent = null;
if(sText.equals("activity_main"))
intent = new Intent(getBaseContext(),TriploggerActivity.class);
//else if(sText.equals("Help")) ..........
if(intent != null)
startActivity(intent);
}
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
}
});
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} //end of connecting listview to another actovity
public void addUser(View view)
{
ArrayAdapter adapter = (ArrayAdapter) getListAdapter();
EditText text = (EditText) findViewById(R.id.editText1);
TriptakerActivity stud = studentDBoperation.addTriptakerActivity(text.getText().toString());
adapter.add(stud);
}
public void deleteFirstUser(View view) {
ArrayAdapter adapter = (ArrayAdapter) getListAdapter();
TriptakerActivity stud = null;
if (getListAdapter().getCount() > 0)
{
stud = (TriptakerActivity) getListAdapter().getItem(0);
studentDBoperation.deleteTriptakerActivity(stud);
adapter.remove(stud);
}
}
#Override
protected void onResume() {
studentDBoperation.open();
super.onResume();
}
#Override
protected void onPause() {
studentDBoperation.close();
super.onPause();
// public void linkclickview(View v)
//// {
//Intent i = new Intent(this,TriploggerActivity.class );
//startActivity(i);
}
}
`
This is the code that I want to use to connect or link to another activity, but it is not working.
Please kindly help me out. Thanks