Question

I’d like to code a little calculator. I’m new to Android Programming and I want to know how to add one letter into a TextView. The letter should be put in after i clicked a Button (tried it with onClickListener).

Answer 1

You can use

@Override
public void onClick(View v){
          char letter='a';
          t.setText(t.getText()+letter);
}

where t is an object of TextView.

setText allows you to reset text at runtime

getText gets current text of TextView