Question

I am trying to enable a button when check box is checked , but iam getting nullpointerexception

viewHolder.checkBox.setChecked(Constants.checkBoxState[position]);


        final Button savebtn1 = (Button) view.findViewById(R.id.savebtn);
        viewHolder.checkBox.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {
                if (((CheckBox) v).isChecked()) {
                    // Toast.makeText(activity, "checked" , Toast.LENGTH_SHORT).show();
                    Constants.checkBoxState[position] = true;
                    Constants.selectedContacts.add(listCont.get(position));
                    savebtn1.setEnabled(true);
                } else {

                    Constants.checkBoxState[position] = false;
                    Constants.selectedContacts.remove(listCont.get(position));

                }

            }
        });

Any idea?

Answer 1

final Button savebtn1 = (Button) view.findViewById(R.id.savebtn);

you are getting NullPointerException because R.id.savebtn is not inside view