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?
1条答案
按热度按时间3qpi33ja1#
我认为你在这部分代码中有一些问题。再次检查要使用哪个视图膨胀哪个布局。
我有一种束缚的感觉。getRoot()没有返回应有的FirstFragment。为什么不调试并验证它是否确实返回'FirstFragment'。