SharedPreferences won't work

Question

I have a problem with these SharedPreferences:

private String StringaCirc;
private StringBuffer StringAux;

[...]

public void stringaCirc(){
    for(int i=0;i<1000;i++)
        StringaCirc1.setCharAt(i, '0');
    StringaCirc=StringaCirc1.toString();
    SharedPreferences prefs = getPreferences(MODE_PRIVATE);
    SharedPreferences.Editor editor = prefs.edit();
    editor.putString("StringaCirc", StringaCirc);
    editor.commit();
    }

But when i call the function the app crashes...What is the problem?

Answer 1

It seems that you haven't defined StringaCirc1 in your method.

try to add this before for() loop

String StringaCirc1 = "";

you also should use lowercase first letters for your strings for readability

private String stringaCirc;
private StringBuffer stringAux;

[...]

public void stringaCirc() {
    String stringaCirc1 = "";
    for(int i=0;i<1000;i++)
        stringaCirc1.setCharAt(i, '0');
    stringaCirc = stringaCirc1.toString();
    SharedPreferences prefs = getPreferences(MODE_PRIVATE);
    SharedPreferences.Editor editor = prefs.edit();
    editor.putString("StringaCirc", stringaCirc);
    editor.commit();
}