private ListView lv;
private String[] data = {"one", "two", "three"}

..onCreate(){

}



  ...
  lv = (ListView) findViewByID(R.id.lv);
  BaseAdapter a = new BaseAdapter(){

    @Override
    public int getCount(){}

    @Override
    public Object getItem(int position){
      return data[position];
    }

    @Override
    public long getItemId(int position){
      return 0;
    }


    @Override
    public View getView(int position, View convertView, ViewGroup parent){
      if(convertView==null) convertView = new TextView(MainActivity.this);
      TextView tv = (TextView) convertView;
      tv.setText(data[position]);
      // I am going to create a new class only if have nothing to recycle
      // and I fill my views with the proper piece of elements
      return tv;
    }


  }

  lv.setAdapter(a);