[android] Android: converting String to int

I'm simply trying to convert a string that is generated from a barcode scanner to an int so that I can manipulate it by taking getting the remainder to generate a set number of integers. So far I have tried:

int myNum = 0;

try {
    myNum = Integer.parseInt(myString.getText().toString());
} catch(NumberFormatException nfe) {

} 

and

Integer.valueOf(mystr);

and

int value = Integer.parseInt(string); 

The first one gives me the error :The method getText() is undefined for the type String while the last two don't have any compile errors but the app crashes immediately when those are called. I thought it had to do with my barcode scanning intent method but I put it into the OnCreate and still got the error.

Use regular expression:

int i=Integer.parseInt("hello123".replaceAll("[\\D]",""));
int j=Integer.parseInt("123hello".replaceAll("[\\D]",""));
int k=Integer.parseInt("1h2el3lo".replaceAll("[\\D]",""));

output:

i=123;
j=123;
k=123;

try this

String t1 = name.getText().toString();
Integer t2 = Integer.parseInt(mynum.getText().toString());

boolean ins = myDB.adddata(t1,t2);

public boolean adddata(String name, Integer price)

// Convert String to Integer

// String s = "fred";  // use this if you want to test the exception below


String s = "100"; 
try
{
  // the String to int conversion happens here
  int i = Integer.parseInt(s.trim());

  // print out the value after the conversion
  System.out.println("int i = " + i);
}
catch (NumberFormatException nfe)
{
  System.out.println("NumberFormatException: " + nfe.getMessage());
}

You can not convert to string if your integer value is zero or starts with zero (in which case 1st zero will be neglected). Try change.

int NUM=null;

It's already a string? Remove the getText() call.

int myNum = 0;

try {
    myNum = Integer.parseInt(myString);
} catch(NumberFormatException nfe) {
  // Handle parse error.
}

Use regular expression:

String s="your1string2contain3with4number";
int i=Integer.parseInt(s.replaceAll("[\\D]", ""))

output: i=1234;

If you need first number combination then you should try below code:

String s="abc123xyz456";
int i=((Number)NumberFormat.getInstance().parse(s)).intValue()

output: i=123;

You just need to write the line of code to convert your string to int.

 int convertedVal = Integer.parseInt(YOUR STR);

Change

try {
    myNum = Integer.parseInt(myString.getText().toString());
} catch(NumberFormatException nfe) {

to

try {
    myNum = Integer.parseInt(myString);
} catch(NumberFormatException nfe) {

barcode often consist of large number so i think your app crashes because of the size of the string that you are trying to convert to int. you can use BigInteger

BigInteger reallyBig = new BigInteger(myString);