Null Validation on EditText box in Alert Dialog - Android

Question

I am trying to add some text validation to an edit text field located within an alert dialog box. It prompts a user to enter in a name.

I want to add some validatio

Answer 1

Even though it's an old post, the code below will help somebody. I used a customized layout and extended DialogFragment class.

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {

    // Get the layout inflater
    LayoutInflater inflater = requireActivity().getLayoutInflater();

    final View view = inflater.inflate(R.layout.Name_of_the_customized_layout, null);

    final EditText etxtChamp = view.findViewById(R.id.editText);


    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    builder.setMessage("Enter a Name")
            .setTitle("Mandatory field ex.");

    builder.setView(view);

    final Button btnOk = view.findViewById(R.id.ok);
    final Button btnCancel = view.findViewById(R.id.cancel);

    btnOk.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if(etxtChamp.getText().toString().isEmpty()){
                etxtChamp.setError("Oups! ce champ est obligatoire!");
            }else{
                //Get the editText content and do whatever you want
                String messageEditText = etxtChamp.getText().toString();

                dismiss();
            }
        }
    });

    btnCancel.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            dismiss();
        }
    });

    return builder.create();
}