Android : Cant View in my custom listview

This is my MainActivity.class I want to view from database but Dont know why this code is giving me nullexception I tried but its not getting where i am wrong

protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);

    try{
    handler = new DataHandler(this);
    handler.open();
    c = handler.getAllMainData();   
    c.moveToFirst();
    while(!c.isAfterLast()){
            CampaignId.add(c.getInt(c.getColumnIndex("campaign_id"))-1, null);
            CampaignName.add(c.getString(c.getColumnIndex("campaign_name")-1));
            Message.add(c.getString(c.getColumnIndex("message")-1));
            StartDate.add(c.getString(c.getColumnIndex("start_date")-1));
            Repeat.add(c.getString(c.getColumnIndex("repeat")-1));
            c.moveToNext();
    }
        handler.close();

    }
    catch(Exception e){
        Log.d("Error",e.toString());
    }
    //View Data
    try{
        ListView lv = (ListView) findViewById(R.id.LVMain);ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>();
        for(int i=0;i<CampaignId.size();i++)
        {

            HashMap<String, String> map = new HashMap<String, String>();
            map.put("CampaignName",CampaignName.get(i));
            map.put("Repeat",Repeat.get(i));
            map.put("StartDate",StartDate.get(i));
            mylist.add(map);
        }
            SimpleAdapter mSchedule = new SimpleAdapter(MainActivity.this, mylist, R.layout.main_listview, new String[] {"CampaignName","Repeat","StartDate"}, new int[] {R.id.viewCampaignName,R.id.viewRepeat,R.id.viewLastSent});
            lv.setAdapter(mSchedule);
        }catch(Exception e){
            e.printStackTrace();
        }
        setContentView(R.layout.activity_main);
    }