Android ListView automatically generates an instance of list entries

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
 xmlns:andro
 android:orientation="vertical"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent">

 <ListView
  android:
  android:layout_width="match_parent"
  android:layout_height="match_parent">
 </ListView>

</LinearLayout>

package .sample_6_4;

import ;
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public class ListActivity extends AppCompatActivity {
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  (savedInstanceState);
  setContentView(.activity_list);
  ListView lv = (ListView)findViewById();
  //Make an adapter to use ListView  (new MyAdapter());
 }
 class MyAdapter extends BaseAdapter{
  @Override
  //Return the number of entries, the list of entries, such as how many entries are displayed on a screen  public int getCount(){
   return 20;
  }
  @Override
  //Determine the layout and content of each entry. The position represents the position of the entry, starting from 0  public View getView(int position, View converView, ViewGroup parent){
   TextView tv = new TextView();
   ("entry" + position);
   (23);
   ();
   return tv;
  }
  @Override
  public Object getItem(int position){
   return null;
  }
  @Override
  public long getItemId(int position){
   return 0;
  }
 }
}