How to convert InputStream to int

Question

I have a txt file called "max_easy.txt" in /raw folder, in this file is written a number, in this case in "0"... I want a var which have 0 as a Int value, how do i do that?

I guess this line gives me a String value, how do i convert it?

InputStream letturaEasy = getResources().openRawResource(R.raw.max_easy);

Solution 1

If this is what you got so far:

InputStream letturaEasy = getResources().openRawResource(R.raw.max_easy);

Then all that needs to be done is to convert that to a String:

String result = getStringFromInputStream(letturaEasy);

And finally, to int:

int num = Integer.parseInt(result);

By the way, getStringFromInputStream() was implemented here:

private static String getStringFromInputStream(InputStream is) {

    BufferedReader br = null;
    StringBuilder sb = new StringBuilder();

    String line;
    try {

        br = new BufferedReader(new InputStreamReader(is));
        while ((line = br.readLine()) != null) {
            sb.append(line);
        }

    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (br != null) {
            try {
                br.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    return sb.toString();     
}

Solution 2

You can use BufferedReader to read lines as strings from that file. Integer.parseInt will parse them to ints:

try(BufferedReader reader = new BufferedReader(new InputStreamReader(letturaEasy, "UTF8")) ) {
    int n = Integer.parseInt(reader.readLine());
}

Comments

[xflea]

The method getStringFromInputStream() cannot be resolved, so i tried this: String valore1 = getResources().getResourceEntryName(R.raw.max_easy); int num = Integer.parseInt(valore1); EasyTxt.setText(num); // the line will be displayed in this textview but as soon as the activity starts the app stop working, anyway Android Studio is giving me no errors... why? :(

[karlphillip]

Updated answer, sorry.

[xflea]

Great, now the app is working fine! Thank you for the help!