Android Invalid Int error when parsing number from text file

Question

I have a .txt in my website that contains a number (in this case 3) and I use this code to check whether this number is greater than or less than another number, but the code gives me this error:

03-03 16:27:43.734: E/AndroidRuntime(16318): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.downloadingprogressbar/com.example.downloadingprogressbar.MainActivity}: java.lang.NumberFormatException: Invalid int: "3

This is my code:

HttpGet httppost = new HttpGet("http://mywebsite.org/version.txt");
    HttpResponse response;
    try {
        response = httpclient.execute(httppost);
        HttpEntity ht = response.getEntity();

        BufferedHttpEntity buf = new BufferedHttpEntity(ht);

        InputStream is = buf.getContent();


        BufferedReader r = new BufferedReader(new InputStreamReader(is));

        StringBuilder total = new StringBuilder();
        String line;
        while ((line = r.readLine()) != null) {
            total.append(line + "\n");
        }
        String casa = new String(total.toString());

        //boolean version = (casa>4);
        if (Integer.parseInt(casa)>4){
            risposta.setText("la tua versione è aggiornata");
        }
        else {
            risposta.setText("aggiorna la tua versione");
        }

Your String casa doesn't just contain the number 3, it also may contain multiple new line \n characters, which cannot be parsed into numbers. — Kon
– Kon, Commented Mar 3, 2015 at 15:45
String casa = EntityUtils.toString(ht). And remove the while-loop, without appending \n — Blackbelt
– Blackbelt, Commented Mar 3, 2015 at 15:45
I forget to remove the while because it's only one line. It's my mistake I'm sorry — Leonardo
– Leonardo, Commented Mar 3, 2015 at 15:52

Jorgesys · Accepted Answer · 2015-03-03 15:50:36Z

1

I agree with Kon, your variable "casa" is containing another characters.

Try using the trim() method:

 if (Integer.parseInt(casa.trim())>4){
...
...
...

but now i see that you are appending the "\n", in total variable, is this "new line" necessary?:

 while ((line = r.readLine()) != null) {
            total.append(line);
        }

answered Mar 3, 2015 at 15:50

Jorgesys

127k26 gold badges347 silver badges276 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

ci_ · Accepted Answer · 2015-03-03 15:50:09Z

0

Try this to remove all whitespace that might be surrounding your number:

if (Integer.parseInt(casa.trim()) > 4){
    // ...
}

answered Mar 3, 2015 at 15:50

ci_

8,77410 gold badges41 silver badges63 bronze badges

Collectives™ on Stack Overflow

Android Invalid Int error when parsing number from text file

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related