string to int,causing app to stop

Question

final EditText ed7 = (EditText)findViewById(R.id.Recycleweight);
final EditText ed8 = (EditText)findViewById(R.id.Nonweight);
final EditText ed11 = (EditText)findViewById(R.id.totalweight);

recy_wt=ed7.getText().toString();
nonrec_wt=ed8.getText().toString();
total_wt=ed11.getText().toString();

int rec = Integer.parseInt(recy_wt);
int nrec = Integer.parseInt(nonrec_wt);
ed11.setText(String.valueOf(rec + nrec));

The input I am giving is,ed7=10kg and ed8=20kg,and it will be displayed in ed11 as 30kg,but the app is unfortunately stopping. If I am not writing 'kg',it is correctly displaying the totalwt. But I want to display 'kg' in the answer.

with string as "kg" how can you parse it in integer for that use substring or replace and remove kg from string then it will work — Vickyexpert, Aug 04 '16 at 10:12
Possible duplicate of [Find and extract a number from a string](http://stackoverflow.com/questions/4734116/find-and-extract-a-number-from-a-string) — Přemysl Šťastný, Aug 04 '16 at 10:20

score 1 · Answer 1 · edited May 23 '17 at 12:32

1

There is already a solution here (can't flag as duplicate) Find and extract a number from a string

Extract the digit part from the string and then parse it to an integer

edited May 23 '17 at 12:32

Community

1
1

answered Aug 04 '16 at 10:15

Aenima

155
1
13

score 0 · Answer 2 · answered Aug 04 '16 at 10:38

0

Try this out

String regexp = "/^[0-9]+kg$/g"; //It accepts only '<number><kg>' format
int weight = 0;
if (recy_wt.matches(regexp) && nonrec_wt.matches(regex)) {
    //It's valid input
    Scanner scan = new Scanner(recy_wt);
    weight = Integer.parseInt(scan.findInLine("\\d+(\\.\\d+)?"));
    Scanner scan = new Scanner(nonrec_wt);
    weight += Integer.parseInt(scan.findInLine("\\d+(\\.\\d+)?"));
}

ed11.setText(String.valueOf(weight + "Kg"));

answered Aug 04 '16 at 10:38

Mr.7

2,292
1
20
33

It is giving 0kg as answer. and 'scan' is causing duplicate,after I changed it to 'scan1' still its not working. – KiranB Aug 05 '16 at 06:11
With what inputs, you get that result? – Mr.7 Aug 05 '16 at 06:18
with, 20kg and 10kg – KiranB Aug 05 '16 at 06:21
I think our `if` condition is not executing. put break point inside `if` and check – Mr.7 Aug 05 '16 at 06:32
even when I gave only numbers like,20and 30,still the ans is 0kg – KiranB Aug 05 '16 at 06:34
ya, the above `regex` condition only checks with `` format and returns `0kg` if not. if you mention what are the possible inputs, and possible `units` (ex: kg, km), we can build another regex – Mr.7 Aug 05 '16 at 06:37
or else i'll post one more answer. if it works fine, reply me back – Mr.7 Aug 05 '16 at 06:40

Mr.7 · Answer 3 · 2016-08-08T06:56:30.903

If the only possible unit is kg, then try like this

final EditText ed7 = (EditText)findViewById(R.id.Recycleweight);
final EditText ed8 = (EditText)findViewById(R.id.Nonweight);
final EditText ed11 = (EditText)findViewById(R.id.totalweight);

int weight = 0;

recy_wt=ed7.getText().toString();
nonrec_wt=ed8.getText().toString();

recy_wt = recy_wt.replace("kg","");
nonrec_wt = nonrec_wt.replace("kg","");

weight += Integer.parseInt(recy_wt) + Integer.parseInt(nonrec_wt);

ed11.setText(weight + "kg");

score -1 · Answer 4 · answered Aug 05 '16 at 09:39

-1

This will work:-

recy_wt=ed7.getText().toString();
nonrec_wt=ed8.getText().toString();

String n=recy_wt.replace("kg","");
String n1=nonrec_wt.replace("kg","");

weight += Integer.parseInt(n) + Integer.parseInt(n1);
ed11.setText(weight + "kg");

storing the replaced one in a string and then converting to int will help.

answered Aug 05 '16 at 09:39

KiranB

13
6

what's the difference between this and my second answer? – Mr.7 Aug 08 '16 at 05:09
There I was still getting 0kg as the answer – KiranB Aug 08 '16 at 06:02
there i forgot to assign the new string(i.e after str.replace("kg", "")) to variables. but the logic is same. now i updated the answer – Mr.7 Aug 08 '16 at 07:00
Yes.Thank you.I have put one more ques,need a help in that. – KiranB Aug 08 '16 at 07:50
I'll try to help you on that too. btw accept an answer which helped you to solve your problem – Mr.7 Aug 08 '16 at 08:05

string to int,causing app to stop

4 Answers4