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

What you should do is to create a custom xml layout including a textbox and an Ok button instead of using .setPositiveButton. Then you can add a click listener to your button in order to validate the data and dismiss the dialog.

It should be used in CreateDialog:

protected Dialog onCreateDialog(int id) 
{
            LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);

if (id==EDIT_DIALOG)
{
            final View layout = inflater.inflate(R.layout.edit_dialog, (ViewGroup) findViewById(R.id.Layout_Edit));

            final Button okButton=(Button) layout.findViewById(R.id.Button_OkTrack);
            final EditText name=(EditText) layout.findViewById(R.id.EditText_Name);
            okButton.setOnClickListener(new View.OnClickListener() 
            {
                public void onClick(View v) {
                    String textString = trackName.getText().toString(); 
                    if (textString != null && textString.trim().length() ==0)
                    {
                        Toast.makeText(getApplicationContext(), "Please enter...", Toast.LENGTH_LONG).show();
                    } else
                        removeDialog(DIALOG_EDITTRACK);
                }
            });            
            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setView(layout);
            builder.setTitle("Edit text");

            AlertDialog submitDialog = builder.create();            
            return submitDialog;
}