Android : I have one edittext and button.when i clicked Button that Inserted item will display another Edittext?

Edittext(AmountPaid) and Button(Print). when i clicked print then amountpaid will display another Edittext(TotalAmount). Each time calculate and display amount. Please guide me the correct way to achieve my objective.

total=(EditText)findViewById(R.id.editText20); amountpaid=(EditText)findViewById(R.id.editText8);

Print.setOnClickListener(new View.OnClickListener() {

    public void onClick(View arg0) {
    String amntpaid=PaymentPaid.getText().toString();
    total.requestfocus();

}

});