小编Seb*_*iaz的帖子

我正在创建一个有登录或登录按钮的应用程序,登录按钮工作正常,但注册按钮给我一个致命的错误,让AVD停止运行应用程序,这是注册的代码活动

@Override
public void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.signup_activity);

    // Set up the signup form.
    usernameView = (EditText) findViewById(R.id.username);
    passwordView = (EditText) findViewById(R.id.password);
    passwordAgainView = (EditText) findViewById(R.id.passwordAgain);

    // Set up the submit button click handler
    findViewById(R.id.action_button).setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {

            // Validate the sign up data
            boolean validationError = false;
            StringBuilder validationErrorMessage =
                    new StringBuilder(getResources().getString(R.string.error_intro));
            if (isEmpty(usernameView)) {
                validationError = true;
                validationErrorMessage.append(getResources().getString(R.string.error_blank_username));
            }
            if (isEmpty(passwordView)) {
                if (validationError) {
                    validationErrorMessage.append(getResources().getString(R.string.error_join));
                }
                validationError = true;
                validationErrorMessage.append(getResources().getString(R.string.error_blank_password));
            }
            if (!isMatching(passwordView, …