Question

In my calculator app, I want an Inverse button, which when clicked changes the text of other buttons. Like sin to sin inverse etc. Is this possible?

Answer 1

You can just change the text of a button in that button onclick event.
Say For example

Button btn = (Button)findViewById(R.id.button1);
btn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {


            if(btn.getText().toString().trim().equals("sin")){
                btn.setText("sin inverse");
            }else if(btn.getText().toString().trim().equals("sin inverse")){
                btn.setText("sin");
            }

            }
        });

I think this will help you