My code does not show errors but what I need is not working, what I want is: that from the Roman class we call the method ToDecimal , which is in the class RomanTodecimal , and in that method I want to modify a textview found in the roman class, said textview is called arabic number and I want to make a settextview(result) the variable result is defined in the method ToDecimal of class RomanTodecimal . Can someone help me?
Here is the complete code of my two classes:
By the way, I am working the Roman class within a section of a tabbed activity, that is, in a fragment.
RomanToDecimal class:
import android.os.Bundle;
import android.widget.TextView;
import java.util.HashMap;
/**
* Created by Johan on 24/04/2018.
*/
public class RomanToDecimal {
int result = 0;
public void toDecimal(String str) {
int len = str.length();
/**
* adding an random char just to be used by the next char to eliminated
* unnecessary out of index checks
*/
str = str + " ";
int result = 0;
for (int i = 0; i < len; i++) {
char ch = str.charAt(i);
/** the next char is needed in case the number is using subtractive pattern */
char nextChar = str.charAt(i + 1);
/** if ch is M add 1000 - definitely not part of subtractive pattern */
if (ch == 'M') {
result += 1000;
/** if ch is C - possible part of subtractive pattern */
} else if (ch == 'C') {
if (nextChar == 'M') {
result += 900;
/** Additionally increasing the index by 1 as the subtractive pattern was used */
i++;
} else if (nextChar == 'D') {
result += 400;
/** Additionally increasing the index by 1 as the subtractive pattern was used */
i++;
} else {
result += 100;
}
/** if ch is D add 500 - definitely not part of subtractive pattern */
} else if (ch == 'D') {
result += 500;
/** if ch is X - possible part of subtractive pattern */
} else if (ch == 'X') {
if (nextChar == 'C') {
result += 90;
/** Additionally increasing the index by 1 as the subtractive pattern was used */
i++;
} else if (nextChar == 'L') {
result += 40;
/** Additionally increasing the index by 1 as the subtractive pattern was used */
i++;
} else {
result += 10;
}
/** if ch is L add 50 - definitely not part of subtractive pattern */
} else if (ch == 'L') {
result += 50;
/** if ch is V add 5 - definitely not part of subtractive pattern */
} else if (ch == 'V') {
result += 5;
/** if ch is I - possible part of subtractive pattern */
} else if (ch == 'I') {
if (nextChar == 'X') {
result += 9;
/** Additionally increasing the index by 1 as the subtractive pattern was used */
i++;
} else if (nextChar == 'V') {
result += 4;
/** Additionally increasing the index by 1 as the subtractive pattern was used */
i++;
} else {
result += 1;
}
}
}
romanos texto=new romanos();
texto.numeroarabigo.setText(result);
}
}
Roman class:
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class romanos extends Fragment {
EditText romano,arabigo;
TextView conversor;
public TextView numeroromano,numeroarabigo;
String romanox = "";
String numromano,number ;
int i,miles, centenas, decenas, unidades,numero,decimal;
//método para pasar a números romanos
public void convertirANumerosRomanos(int numero) {
//obtenemos cada cifra del número
miles = numero / 1000;
centenas = numero / 100 % 10;
decenas = numero / 10 % 10;
unidades = numero % 10;
//millar
for (i = 1; i <= miles; i++) {
romanox = romanox + "M";
}
//centenas
if (centenas == 9) {
romanox = romanox + "CM";
} else if (centenas >= 5) {
romanox = romanox + "D";
for (i = 6; i <= centenas; i++) {
romanox = romanox + "C";
}
} else if (centenas == 4) {
romanox = romanox + "CD";
} else {
for (i = 1; i <= centenas; i++) {
romanox = romanox + "C";
}
}
//decenas
if (decenas == 9) {
romanox = romanox + "XC";
} else if (decenas >= 5) {
romanox = romanox + "L";
for (i = 6; i <= decenas; i++) {
romanox = romanox + "X";
}
} else if (decenas == 4) {
romanox = romanox + "XL";
} else {
for (i = 1; i <= decenas; i++) {
romanox = romanox + "X";
}
}
//unidades
if (unidades == 9) {
romanox = romanox + "IX";
} else if (unidades >= 5) {
romanox = romanox + "V";
for (i = 6; i <= unidades; i++) {
romanox = romanox + "I";
}
} else if (unidades == 4) {
romanox = romanox + "IV";
} else {
for (i = 1; i <= unidades; i++) {
romanox = romanox + "I";
}
}
romano.setText(romanox);
numeroromano.setText(romanox);
romanox="";
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
//return inflater.inflate(R.layout.fragment_romano, container, false);
View v1 = inflater.inflate(R.layout.fragment_romano, container, false);
romano=(EditText)v1.findViewById(R.id.romano);
arabigo=(EditText)v1.findViewById(R.id.arabigo);
conversor=(TextView)v1.findViewById(R.id.convers);
numeroromano=(TextView)v1.findViewById(R.id.numeroromano);
numeroarabigo=(TextView)v1.findViewById(R.id.numeroarabigo);
/*try {
arabigo.setOnEditorActionListener(new TextView.OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
if (actionId == EditorInfo.IME_ACTION_DONE || actionId == EditorInfo.IME_ACTION_NEXT) {
try {
if (Integer.parseInt(arabigo.getText().toString())>3999){
Toast toast1 = Toast.makeText(getContext(), "No puede ingresar un valor mayor a 3999 ", Toast.LENGTH_SHORT);
toast1.setGravity(Gravity.CENTER, 10, 10);
toast1.show();
}
else {
convertirANumerosRomanos(Integer.parseInt(arabigo.getText().toString()));
}
}catch(Exception e){
numero=0;
}
}
return false;
}
});
}catch (Exception e){
numero=0;
}
*/
try {
romano.setOnEditorActionListener(new TextView.OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
if (actionId == EditorInfo.IME_ACTION_DONE || actionId == EditorInfo.IME_ACTION_NEXT) {
try {
RomanToDecimal adecimal=new RomanToDecimal();
adecimal.toDecimal(romano.getText().toString());
}catch(Exception e){
//numero=0;
}
}
return false;
}
});
}catch (Exception e){
//numero=0;
}
return v1;
}
}