getting data from a website Api to a android app

Question

I have some Java knowledge but its very fresh. Yesterday I started learning some Java for Android and encountered a problem. Specifically I want to retrieve a decimal number from a website API for some in-app calculations. I have code that works perfectly in normal Java, but when I insert it into Android Studio it compiles but the app crashes at start. Any help would be appreciated.

Here's the number retrieval code :

        URL url = new URL("api.example.com");

    URLConnection con = url.openConnection();
    InputStream is =con.getInputStream();

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

    String line = null;
    int cont=0;

    while ((line = br.readLine()) != null) {
        cont++;
        if(cont==28){
            Dol = Double.parseDouble(line.substring(25, 31));

        }
    }

Androids prevents any networking code to be run in the main thread. stackoverflow.com/questions/6343166/… — M4rtini
– M4rtini, Commented Jun 14, 2015 at 15:07
Don't do network operation on main thread . Use Asynctask instead for network operations — N J
– N J, Commented Jun 14, 2015 at 15:07
@Nilesh thanks man! why is Asynctask better than network operations and sorry for bothering. Thanks! — guilloh
– guilloh, Commented Jun 14, 2015 at 15:13
AsynchTask is a convenience class for doing processing (like networking) in a second thread, and pushing the result back to the main thread. — M4rtini
– M4rtini, Commented Jun 14, 2015 at 15:17

pavaniiitn · Accepted Answer · 2015-06-15 07:15:50Z

1

anything related to networking tasks you need to perform in AsyncTask only
try it in AsyncTask

answered Jun 15, 2015 at 7:15

pavaniiitn

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