onTextChanged.java

EditText etValue = (EditText) findViewById(R.id.etValue);
etValue.addTextChangedListener(new TextWatcher() {
	@Override
	public void onTextChanged(CharSequence s, int start, int before, int count) {
		// Fires right as the text is being changed (even supplies the range of text)
	}
	
	@Override
	public void beforeTextChanged(CharSequence s, int start, int count,
			int after) {
		// Fires right before text is changing
	}
	
	@Override
	public void afterTextChanged(Editable s) {
		// Fires right after the text has changed
		tvDisplay.setText(s.toString());
	}
});