Question

I want to save a String value on Android and have access to this String every time the application starts.

For instance the String value will have the user’s name which he has created on his own. And after restarting the app he would have this name already on the top. Like a cookie or something. How to save such file on android memory ?

Can someone guide me?

I used:

public class Login extends Activity
{
String user = null;

public String saveUserOnAndroid()
{
    SharedPreferences myPrefs = getApplicationContext().getSharedPreferences("myPrefs", 0);

    String savedUser = myPrefs.getString("user", null);

    if(savedUser == null)
    {
        user = UUID.randomUUID().toString();
        String hashedUser = md5(user);
        SharedPreferences.Editor myPrefsEditor = myPrefs.edit();

        myPrefsEditor.putString("user", hashedUser);
        myPrefsEditor.commit();

        return hashedUser;
    }   
    else
        return savedUser;
}

and it seems not to work well.

Answer 1

Well you didn’t mention you’re calling the saveUserOnAndroid() method from another class. In this case:

public String saveUserOnAndroid(Context c) {
  SharedPreferences myPrefs = c.getSharedPreferences("myPrefs", 0);
  String savedUser = myPrefs.getString("user", null);

  if(savedUser == null) {
    user = UUID.randomUUID().toString();
    String hashedUser = md5(user);
    SharedPreferences.Editor myPrefsEditor = myPrefs.edit();

    myPrefsEditor.putString("user", hashedUser);
    myPrefsEditor.commit();

    return hashedUser;
  } else {
    return savedUser;
  }
}

And when calling this method, don’t forget to supply it the required Context and you should be okay.