Android. How to save user name and password after the app is closed?

Question

I am writing an application with login details (username and password).
I want to make it so that when the user closes the application and starts it again later he/she d

Answer 1

Try this way: defined Preferences first

private static final String PREFS_NAME = "preferences";
private static final String PREF_UNAME = "Username";
private static final String PREF_PASSWORD = "Password";

private final String DefaultUnameValue = "";
private String UnameValue;

private final String DefaultPasswordValue = "";
private String PasswordValue;

And onPause()

@Override
public void onPause() {
    super.onPause();
    savePreferences();

}

And onResume()

@Override
public void onResume() {
    super.onResume();
    loadPreferences();
     }

And here savePreferences()

private void savePreferences() {
    SharedPreferences settings = getSharedPreferences(PREFS_NAME,
            Context.MODE_PRIVATE);
    SharedPreferences.Editor editor = settings.edit();

    // Edit and commit
    UnameValue = edt_username.getText();
    PasswordValue = edt_password.getText();
    System.out.println("onPause save name: " + UnameValue);
    System.out.println("onPause save password: " + PasswordValue);
    editor.putString(PREF_UNAME, UnameValue);
    editor.putString(PREF_PASSWORD, PasswordValue);
    editor.commit();
}

And here loadPreferences()

private void loadPreferences() {

    SharedPreferences settings = getSharedPreferences(PREFS_NAME,
            Context.MODE_PRIVATE);

    // Get value
    UnameValue = settings.getString(PREF_UNAME, DefaultUnameValue);
    PasswordValue = settings.getString(PREF_PASSWORD, DefaultPasswordValue);
    edt_username.setText(UnameValue);
    edt_password.setText(PasswordValue);
    System.out.println("onResume load name: " + UnameValue);
    System.out.println("onResume load password: " + PasswordValue);
}