Nrthugu

I'm interested in getting an object reference to a list item in a ListView when that item is clicked. Every item on my custom item XML contains a Button and a TextView that are hidden by default. The click on an item should change their visibility to visible.

Here's what I mean, done in the integrated graphic editor.

Should become this

This is my custom getView for the AdapterView

@Override

public View getView(int position, View v, ViewGroup viewGroup){



    if(v==null){

        LayoutInflater li= LayoutInflater.from(getContext());

        v= li.inflate(R.layout.custom_list_item, null);

    }



    Student s= getItem(position);

    TextView name= v.findViewById(R.id.txt_name);

    TextView surname= v.findViewById(R.id.txt_surname);

    TextView id= v.findViewById(R.id.txt_id);



    //following methods come from my Student class

    if(s != null){

        name.setText(s.getName());

        surname.setText(s.getSurname());

        id.setText(s.getId());

    }

    return v;

}

and here's what I (would like to) do in my Activity, but doesn't work by now.

ListView list= findViewById(R.id.advanced_list);

    final StudentAdapter adapter= new StudentAdapter(

            this,

            R.layout.custom_list_item,

            getStudents()

    );



    list.setAdapter(adapter);





    list.setOnItemClickListener(new AdapterView.OnItemClickListener() {

        @Override

        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {



            TextView tel= findViewById(R.id.txt_tel);

            Button delete= findViewById(R.id.btn_delete);



            tel.setVisibility(View.VISIBLE);

            delete.setVisibility(View.VISIBLE);

        }

    });

list.setOnItemClickListener(new AdapterView.OnItemClickListener() {

    @Override

    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {



        TextView tel= findViewById(R.id.txt_tel);

        Button delete= findViewById(R.id.btn_delete);



        tel.setVisibility(View.VISIBLE);

        delete.setVisibility(View.VISIBLE);

    }

});

You're trying to look the Views up in the Activity layout, but they are in the View you get as the parameter. You can fix it like this:

...

TextView tel= view.findViewById(R.id.txt_tel);

Button delete= view.findViewById(R.id.btn_delete);

...

You can toggle the visibility in the listView row itself. I'd first like to state a problem I found in your code:

TextView tel= findViewById(R.id.txt_tel);

it should be TextView tel= view.findViewById(R.id.txt_tel); since the TextView tel is not part of your main layout, but instead the listView's layout.
Below are two explanations for how to handle the visibility.

Basic answer:
In the public View getView method, just set an onClickListener or onTouchListener for whatever item you want to be clicked to make the others visible.
To toggle the visibility of your TextViews, just do textView.setVisibility(View.VISIBLE); and put this in the onClickListener. All of this code should be in your ListView Adapter.

Elaborated answer:
Here is the code

public class MyAdapter extends ArrayAdapter<MyClass> {

     private Context mContext;

     Activity activity;

     private List<MyClass> class = new ArrayList<>();



     public LogAdapter(Activity a, Context context, ArrayList<MyClass> list) {

         super(context, 0, list);

         mContext = context;

         activity = a;

         class= list;

     }

     @NonNull

     @Override

     public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {

         View listItem = convertView;

         if (listItem == null){

             //If the row is empty, inflate it with your elements found in the 'mylistview' layout file.

             listItem = LayoutInflater.from(mContext).inflate(R.layout.mylistview, parent, false);

         }

         //These names and views are made up. You can change them to suit your needs for which items should become visible on a certain items click.

         Button changeVisibility = listItem.findViewById(R.id.change);

         TextView name = listItem.findViewById(R.id.name);

         TextView surname = listItem.findViewById(R.id.surname);



         changeVisibility.setOnClickListener(new View.OnClickListener() {

             @Override

             public void onClick(final View view) {

                 name.setVisibility(View.VISIBLE);

                 surname.setVisibility(View.VISIBLE);

             }

         }

    }

}

The names, such as MyAdapter and the class MyClass are just examples, you need to make those. Once you do, your Adapter class should look like mine above. You can also change the button and TextView names, it just depends upon what layout file you are inflating your listItem with.

If you are still having problems with your code, check out this link for an explanation on how to make your custom listView from scratch.
Hope this helps!