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@SuppressLint("MissingPermission")
public static Pair<String, String> getCredentials(Context context) {
    String username = Preferences.getUsername(context);
    if (TextUtils.isEmpty(username)) {
        return null;
    }
    AccountManager accountManager = AccountManager.get(context);
    Account[] accounts = accountManager.getAccountsByType(BuildConfig.APPLICATION_ID);
    for (Account account : accounts) {
        if (TextUtils.equals(username, account.name)) {
            return Pair.create(username, accountManager.getPassword(account));
        }
    }
    return null;
}

@SuppressLint("MissingPermission")
public static void showLogin(Context context, AlertDialogBuilder alertDialogBuilder) {
    Account[] accounts = AccountManager.get(context).getAccountsByType(BuildConfig.APPLICATION_ID);
    if (accounts.length == 0) { // no accounts, ask to login or re-login
        context.startActivity(new Intent(context, LoginActivity.class));
    } else if (!TextUtils.isEmpty(Preferences.getUsername(context))) { // stale account, ask to re-login
        context.startActivity(new Intent(context, LoginActivity.class));
    } else { // logged out, choose from existing accounts to log in
        showAccountChooser(context, alertDialogBuilder, accounts);
    }
}

    @SuppressLint("MissingPermission")
    static void registerAccountsUpdatedListener(final Context context) {
        AccountManager.get(context).addOnAccountsUpdatedListener(accounts -> {
            String username = Preferences.getUsername(context);
            if (TextUtils.isEmpty(username)) {
                return;
            }
            for (Account account : accounts) {
                if (TextUtils.equals(account.name, username)) {
                    return;
                }
            }
            Preferences.setUsername(context, null);
        }, null, true);
    }