Android Fragments 无法解析符号“editText”android|装订

我现在正在做一个android应用程序，它都能用。下面是我的第一个片段的代码：

package com.example.matha;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.navigation.fragment.NavHostFragment;

import com.example.matha.databinding.FragmentFirstBinding;

public class FirstFragment extends Fragment {
    int correct_answer;
    private FragmentFirstBinding binding;
    private MathQuiz mathQuiz;

    @Override
    public View onCreateView(
            LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState
    ) {
        binding = FragmentFirstBinding.inflate(inflater, container, false);
        return binding.getRoot();
    }

    public void onViewCreated(@NonNull View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        mathQuiz = new MathQuiz();
        askQuestion();

        /*
        binding.answerEt.setOnEditorActionListener(new EditText.OnEditorActionListener() {
            @Override
            public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
                if (actionId == EditorInfo.IME_ACTION_DONE) {
                    String answerString = binding.answerEt.getText().toString();
                    int answer = answerString.isEmpty() ? 0 : Integer.parseInt(answerString);
                    System.out.println("USER SAID: " + answer);

                    boolean correct = mathQuiz.checkAnswer(answer, correct_answer);
                    if (correct) {
                        askQuestion();
                    } else {
                        //updateLives();
                        askQuestion();
                    }
                    binding.answerEt.setText("");
                    return true;
                }
                return false;
            }
        });
        */


        binding.submitButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String answerString = binding.answerEt.getText().toString();
                int answer = answerString.isEmpty() ? 0 : Integer.parseInt(answerString);
                System.out.println("USER SAID: "+answer);

                boolean correct = mathQuiz.checkAnswer(answer, correct_answer);
                if (correct) {
                    askQuestion();
                } else {
                    //updateLives();
                    askQuestion();

                }
                binding.answerEt.setText("");
            }
        });
    }

    private void askQuestion() {
        MathQuiz.MyQuestion question = mathQuiz.generateQuestion();
        correct_answer = question.correct;
        binding.questionTw.setText(String.valueOf(question.string));

    }

    private void updateLives() {
        int lives = mathQuiz.getLives();
        if (lives <= 0) {

        }}}

这是我的数学测验：

package com.example.matha;
import java.util.Random;

public class MathQuiz {
    int xmin = 1;
    int xmax = 25;
    int ymin = 1;
    int ymax = 25;
    int score = 0;

    int allowed_fails = 3;
    int allowed_corrects = 10;

    int correct_answer = 0;
    int x = 0;
    int y = 0;
    int questions_correct = 0;
    int questions_wrong = 0;
    private Random random;

    private int lives;
    private int numQuestions;

    public MathQuiz() {
        random = new Random();
        score = 0;
        lives = 3;
        numQuestions = 0;
    }

    public MyQuestion generateQuestion() {
        x = (int) (Math.random() * (xmax - xmin + 1)) + xmin;
        y = (int) (Math.random() * (ymax - ymin + 1)) + ymin;
        MyQuestion question = new MyQuestion();
        question.correct = x * y;
        question.string = x +"*"+y;
        return question;
    }
    public class MyQuestion {
        public String string;
        public int correct;
    }
    public boolean checkAnswer(int answer, int correct_answer) {
        boolean correct = answer == correct_answer;
        if (correct) {
            score++;
        } else {
            lives--;
        }
        numQuestions++;
        return correct;
    }

    public int getScore() {
        return score;
    }

    public int getLives() {
        return lives;
    }

    public int getNumQuestions() {
        return numQuestions;
    }

}

下面是我的xml：

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".FirstFragment">

    <EditText
        android:id="@+id/answer_et"
        android:layout_width="300sp"
        android:layout_height="100sp"
        android:ems="10"
        android:inputType="numberDecimal"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.495"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.412"
        tools:ignore="SpeakableTextPresentCheck" />

    <TextView
        android:id="@+id/question_tw"
        android:layout_width="248dp"
        android:layout_height="73dp"
        android:layout_marginTop="60dp"
        android:layout_marginBottom="78dp"
        android:text="x * y"
        android:textSize="34sp"
        app:layout_constraintBottom_toTopOf="@+id/answer_et"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.496"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.291" />

    <TextView
        android:id="@+id/score_tw"
        android:layout_width="92dp"
        android:layout_height="30dp"
        android:text="Score:"
        android:textSize="20sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.05"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.022" />

    <TextView
        android:id="@+id/lives_tw"
        android:layout_width="92dp"
        android:layout_height="30dp"
        android:layout_marginStart="210dp"
        android:text="Lives:"
        android:textSize="20sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintStart_toEndOf="@+id/score_tw"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.022" />

    <Button
        android:id="@+id/submitButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Submit"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/answer_et" />

</androidx.constraintlayout.widget.ConstraintLayout>

我试图让当“提交按钮”被按下时执行的函数在这个小检查图标被按下时执行（左下角）：

我尝试了以下方法：

binding.answerEt.setOnEditorActionListener(new EditText.OnEditorActionListener() {
            @Override
            public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
                if (actionId == EditorInfo.IME_ACTION_DONE) {
                    String answerString = binding.answerEt.getText().toString();
                    int answer = answerString.isEmpty() ? 0 : Integer.parseInt(answerString);
                    System.out.println("USER SAID: " + answer);

                    boolean correct = mathQuiz.checkAnswer(answer, correct_answer);
                    if (correct) {
                        askQuestion();
                    } else {
                        //updateLives();
                        askQuestion();
                    }
                    binding.answerEt.setText("");
                    return true;
                }
                return false;
            }
        });

但它不会工作，并给出5个错误：无法解析符号“EditText”方法未重写其超类中的方法无法解析符号“TextView”无法解析符号“KeyEvent”无法解析符号“EditorInfo”
我试了很多，但我不知道如何解决这个问题。有谁知道一个资源，像按钮，编辑文本的东西得到教导？

Android Fragments 无法解析符号“editText”android|装订

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