final EditText First = (EditText)findViewById(R.id.etFirst);
        final EditText done = (EditText)findViewById(R.id.etAName);
        Button Trans = (Button) findViewById(R.id.bTrans);

        	Trans.setOnClickListener(new View.OnClickListener() {

				public void onClick(View v) {
					//First EditText
					if (First.getText().toString().equals("John")) {
						done.setText("JOHN");
					} else {
					if (First.getText().toString().equals("Ahmed")) {
						done.setText("AHMED");
					} else  {
					//	done.setText(First.getText());
						done.addTextChangedListener(new TextWatcher() {
					        public void onTextChanged(CharSequence s, int start, int before, int count) {
					        }

					        public void beforeTextChanged(CharSequence s, int start, int count, int after)    {
					        }

					        public void afterTextChanged(Editable s) {
					            // EXAMPLE
					            done.setText(First.getText().toString().replaceAll("S", "$"));
									        }
									    });
									}
								}
							};
        				});