How to refresh Android listview?

Call notifyDataSetChanged() on your Adapter object once you've modified the data in that adapter.

Some additional specifics on how/when to call notifyDataSetChanged() can be viewed in this Google I/O video.

Consider you have passed a list to your adapter.
Use:

list.getAdapter().notifyDataSetChanged()

to update your list.

After deleting data from list view, you have to call refreshDrawableState(). Here is the example:

final DatabaseHelper db = new DatabaseHelper (ActivityName.this);

db.open();

db.deleteContact(arg3);

mListView.refreshDrawableState();

db.close();

and deleteContact method in DatabaseHelper class will be somewhat looks like

public boolean deleteContact(long rowId) {

   return db.delete(TABLE_NAME, BaseColumns._ID + "=" + rowId, null) > 0;

}

on other option is onWindowFocusChanged method, but sure its sensitive and needs some extra coding for whom is interested

 override fun onWindowFocusChanged(hasFocus: Boolean) {
        super.onWindowFocusChanged(hasFocus)

       // some controls needed
        programList = usersDBHelper.readProgram(model.title!!)
        notesAdapter = DailyAdapter(this, programList)
        notesAdapter.notifyDataSetChanged()
        listview_act_daily.adapter = notesAdapter
    }

If I talked about my scenario here, non of above answers will not worked because I had activity that show list of db values along with a delete button and when a delete button is pressed, I wanted to delete that item from the list.

The cool thing was, I did not used recycler view but a simple list view and that list view initialized in the adapter class. So, calling the notifyDataSetChanged() will not do anything inside the adapter class and even in the activity class where adapter object is initialized because delete method was in the adapter class.

So, the solution was to remove the object from the adapter in the adapter class getView method(to only delete that specific object but if you want to delete all, call clear()).

To you to get some idea, what was my code look like,

public class WordAdapter extends ArrayAdapter<Word> {
  Context context;

  public WordAdapter(Activity context, ArrayList<Word> words) {}
    //.......

    @NonNull
    @Override
    public View getView(final int position, View convertView, ViewGroup group) {
      //.......
     ImageButton deleteBt = listItemView.findViewById(R.id.word_delete_bt);
     deleteBt.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
             if (vocabDb.deleteWord(currentWord.id)) {
                //.....
             } else{
                //.....
             }
             remove(getItem(position)); // <---- here is the trick ---<
             //clear() // if you want to clear everything
         }
    });
 //....

Note: here remove() and getItem() methods are inherit from the Adapter class.

• remove() - to remove the specific item that is clicked
• getItem(position) - is to get the item(here, thats my Word object that I have added to the list) from the clicked position.

This is how I set the adapter to the listview in the activity class,

    ArrayList<Word> wordList = new ArrayList();
    WordAdapter adapter = new WordAdapter(this, wordList);

    ListView list_view = (ListView) findViewById(R.id.activity_view_words);
    list_view.setAdapter(adapter);