Question

I am writing an app to save password with a log in interface. The user can change the log in password. I use the following code to save the password, so that the password will not reset when the app relaunch.

@Override
public void onSaveInstanceState(Bundle savedInstanceState){
savedInstanceState.putString("pwd", currentPwd);
super.onSaveInstanceState(savedInstanceState);
}

@Override
public void onRestoreInstanceState(Bundle savedInstanceState){
    currentPwd = savedInstanceState.getString("pwd");
}

But I found that it can only save the password for a while. When I wait it for a long time, about 1 hours, without reboot the mobile, it will reset my password.

How to save the password so that it will not reset?

Answer 1

you have to save the data using sharedpreferences:

SharedPreferences prefs =
     getSharedPreferences("myprefname",Context.MODE_PRIVATE);

SharedPreferences.Editor editor = prefs.edit();
editor.putString("pwd", "thepassword");
editor.commit();

then you can retreive it:

SharedPreferences prefs =
    getSharedPreferences("myprefname",Context.MODE_PRIVATE);

String password=prefs.getString("pwd",null);