How to refresh listview in a custom adapter?

Question

I made a custom listview with a custom adapter that populated from database. I can't update my listview whenever the data from database has changed. I have already tried using notifysetdatachanged() but it didn't work. Maybe it's because I putted the code in a wrong way. Please help me to solve this problem. Thanks.

ContactActivity.java

    public  void getImages2(){
        class GetImages2 extends AsyncTask<Void,Void,Void>{
            @Override
            protected void onPreExecute() {
                super.onPreExecute();

            }

            @Override
            protected void onPostExecute(Void v) {
                super.onPostExecute(v);
                loading.dismiss();
                customList = new CustomList(ContactActivity.this,GetAlImages2.imageURLs,GetAlImages2.bitmaps,GetAlImages2.code,GetAlImages2.name,GetAlImages2.phone,GetAlImages2.email);
                listView.setAdapter(customList);
                customList.notifyDataSetChanged();
  
                }
            @Override
            protected Void doInBackground(Void... voids) {
                try {
                    getAlImages2.getAllImages2();

                } catch (JSONException e) {
                    e.printStackTrace();
                }
                return null;
            }
        }
        GetImages2 getImages = new GetImages2();
        getImages.execute();
    }

CustomList.java

public class CustomList extends ArrayAdapter<String> {
    private Bitmap[] bitmaps;
    private String[] urls;
    private String[] code;
    private String[] name;
    private String[] email;
    private String[] phone;

    private Activity context;

    public CustomList(Activity context,  String[] urls, Bitmap[] bitmaps, String[] code, String[] name, String[] phone, String[] email) {
        super(context, R.layout.activity_contact_item, urls);
        this.context = context;
        this.urls= urls;
        this.bitmaps= bitmaps;
        this.code= code;
        this.name= name;
        this.phone= phone;
        this.email =  email;
    }

}

[EDIT]

Finally I have found the solution of my problem. My listview should have checked first whether the listview's adapter is empty or not. I added this code to my onPostExecute. Thanks for all your help.

customList = new CustomList(ContactActivity.this,GetAlImages2.imageURLs,GetAlImages2.bitmaps,GetAlImages2.code,GetAlImages2.name,GetAlImages2.phone,GetAlImages2.email);
if(listView.getAdapter() == null){ //Adapter not set yet.
   listView.setAdapter(customList);
}
else{ //Already has an adapter
   listView.setAdapter(customList);
   customList.notifyDataSetChanged();
   listView.invalidateViews();
   listView.refreshDrawableState();
}

Answer 1

Try this

Inside your onResume() add this

if (listvew!= null) {
  listvew.invalidateViews();
}
adapter.notifyDataSetChanged();