Search code examples
androidseparator

How can Separate a number from a text in Android?

this is my code :

String addchar = "";
String tempchar;
int len = strline.length();
char[] chars = strline.toCharArray();
int amount = 0;

for (int i = 0; i < len; i++) {
    tempchar = String.valueOf(chars[i]);
    if (tempchar == "0" || tempchar == "1" || tempchar == "2" || tempchar == "3" || tempchar == "4" || tempchar == "5" || tempchar == "6" || tempchar == "7" || tempchar == "8" || tempchar == "9") {
        addchar=tempchar+addchar;
    }
}

amount=Integer.parseInt(addchar);

but when run this code , I see that amount is empty! I want to extract , the number that there is in strline

Solution

  • Slightly less elegant than Nilesh's answer, but as an alternative:

    StringBuilder sb = new StringBuilder();

for (char c : strline.toCharArray()) {
    if ((sb.length() == 0 && "-".equals(c)) || Character.isDigit(c)) sb.append(c);
}

int amount = Integer.parseInt(sb.toString());

    Edit Amended to allow for initial negative sign