如何在测验应用程序中检查洗牌数组的答案

Question

我在本网站上关注了另一篇关于如何随机播放测验应用程序的问题和答案的帖子，但我需要帮助（a）在 textview 中显示问题和（b）检查来自 edittext 的答案，因为我没有知道如何从 shuffled 数组中调用它们。

主活动文件 -

   import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.EditText;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;



public class MainActivity extends AppCompatActivity {




    Button submit_btn, next_btn;

    TextView scoremm6, question;

    EditText answer;

    String manswer;

    public TextView getScoreT2() {
        return scoremm6;
    }

    private int mScore = 0;
    private boolean done;
    private int QuestionNo = 0;

    private int mQuestionNumber = 0;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findViewById(R.id.answer).setBackgroundResource(R.drawable.rounded_cornerquestion);
        findViewById(R.id.submit_btn).setEnabled(true);



        final Button enter_btn = (Button) findViewById(R.id.submit_btn);
        answer = (EditText) findViewById(R.id.answer);

        scoremm6 = (TextView) findViewById(R.id.scoremm6);
        question = (TextView) findViewById(R.id.question);

        scoremm6.setText("Score: " + mScore);

        List<Questions> questions = new ArrayList<Questions>();

        questions.add(
                new Questions(
                        "3 x 5",
                        "15"
                )
        );
        questions.add(
                new Questions(
                        "4 x 5",
                        "20"
                )
        );
        questions.add(
                new Questions(
                        "5 x 5",
                        "25"
                )
        );
        questions.add(
                new Questions(
                        "6 x 5",
                        "30"
                )
        );
        questions.add(
                new Questions(
                        "7 x 5",
                        "35"
                )
        );
        questions.add(
                new Questions(
                        "8 x 5",
                        "40"
                )
        );
        questions.add(
                new Questions(
                        "9 x 5",
                        "45"
                )
        );
        questions.add(
                new Questions(
                        "10 x 5",
                        "50"
                )
        );
        questions.add(
                new Questions(
                        "11 x 5",
                        "55"
                )
        );
        questions.add(
                new Questions(
                        "12 x 5",
                        "60"
                )
        );
        questions.add(
                new Questions(
                        "2 x 4",
                        "8"
                )
        );
        questions.add(
                new Questions(
                        "3 x 4",
                        "12"
                )
        );
        questions.add(
                new Questions(
                        "4 x 4",
                        "16"
                )
        );
        questions.add(
                new Questions(
                        "5 x 4",
                        "15"
                )
        );
        Collections.shuffle(questions);

//这是我需要帮助从混洗数组中检索正确答案的地方

        Button Submit = (Button) findViewById(R.id.submit_btn);
        Submit.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                if (done == false) {
                    String answer = ((EditText) findViewById(R.id.answer)).getText().toString();
                    String[] answers1 = getString(new ArrayList<Questions>manswer;
                    String correctanswer = answers1[QuestionNo];
                    //gets the answer and correct answer from the edit text and strings.xml respectively
                    correctanswer = correctanswer;
                    answer = answer;


                    if (answer.equals(correctanswer)) {
                        mScore++;
                        findViewById(R.id.answer).setBackgroundResource(R.drawable.rounded_cornerbuttonscorrect);
                        scoremm6.setText("Score: " + mScore);
                        enter_btn.setEnabled(false);
                        Toast.makeText(getApplicationContext(), "Correct.",
                                Toast.LENGTH_SHORT).show();


                    } else {
                        findViewById(R.id.answer).setBackgroundResource(R.drawable.rounded_cornerbuttonsincorrect);
                        enter_btn.setEnabled(false);
                    }

                }

            }


        });

//我这里也需要帮助才能转到另一个问题

        Button Next2 = (Button) findViewById(R.id.next_btn);
        Next2.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {

                String[] mquestions =  getString(new ArrayList<Questions>);
                if (QuestionNo < (mquestions.length -1)) {
                    QuestionNo = QuestionNo + 1;
                    findViewById(R.id.answer).setBackgroundResource(R.drawable.rounded_cornerquestion);
                    enter_btn.setEnabled(true);
                    answer.getText().clear();
                    TextView t = (TextView) findViewById(R.id.question);
                    t.setText(mquestions[QuestionNo]);


                }


                {

                    if (QuestionNo == (questions.length)) {
                        enter_btn.setEnabled(false);
                        Toast.makeText(getApplicationContext(), "Test Completed",
                                Toast.LENGTH_LONG).show();

                    }

                }

            }


        });
    }
} 

Answer 1

你最终可以做到这一点

public class MainActivity extends AppCompatActivity {
    private static final String TAG = MainActivity.class.getSimpleName();

    private HashMap<String, Question> remainingQuestions;
    private HashMap<String, Question> answeredQuestions;
    private Question currentQuestion;
    private int score = 0;

    private TextView scoreField;
    private TextView statement;
    private EditText answer;
    private Button checkAnswer;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        scoreField = findViewById(R.id.score);
        statement = findViewById(R.id.statement);
        answer = findViewById(R.id.answer);
        checkAnswer = findViewById(R.id.check_answer);

        checkAnswer.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(final View v) {
                final String givenAnswer = answer.getText().toString();
                if(givenAnswer.equals(currentQuestion.getAnswer())) {
                    remainingQuestions.remove(currentQuestion.getStatement());
                    answeredQuestions.put(currentQuestion.getStatement(), currentQuestion);

                    score++;
                    scoreField.setText(String.valueOf(score));

                    Toast.makeText(v.getContext(), "Good answer", Toast.LENGTH_LONG).show();
                } else {
                    Toast.makeText(v.getContext(), "Wrong answer", Toast.LENGTH_LONG).show();
                }

                if(remainingQuestions.size() != 0) {
                    askNewQuestion();
                }
            }
        });

        remainingQuestions = new HashMap<>();
        answeredQuestions = new HashMap<>();

        initQuestions();
    }

    @Override
    protected void onPostResume() {
        super.onPostResume();

        askNewQuestion();
    }

    private void initQuestions() {
        Log.d(TAG, "initQuestions");

        remainingQuestions.put("2 x 3 ?", new Question("2 x 3 ?", "6"));
        remainingQuestions.put("2 x 4 ?", new Question("2 x 4 ?", "8"));
        remainingQuestions.put("2 x 5 ?", new Question("2 x 5 ?", "10"));
        remainingQuestions.put("2 x 6 ?", new Question("2 x 6 ?", "12"));
        remainingQuestions.put("2 x 7 ?", new Question("2 x 7 ?", "14"));
    }

    private void askNewQuestion() {
        Log.d(TAG, "askNewQuestion");

        final Random random = new Random();
        currentQuestion = (Question) remainingQuestions.values().toArray()[random.nextInt(remainingQuestions.size())];

        statement.setText(currentQuestion.getStatement());
        answer.setText("");
    }
}