Question

我目前正在使用android studio和genymotion在Android上开发一个简单的测验应用程序。该应用程序总共有10个问题，其他8个我将在稍后添加。大多数代码对我来说都很好。但是，有一些事情我无法理解，有些方法表示无论我尝试什么都不使用它们，并且变量使用不正确的答案。基本上，我希望测验提出10个问题，在点击单选按钮后更改屏幕，然后在问题10后告诉用户他们的分数结束。

有没有人知道如何解决这个问题，因为我在我的智慧结束？我是否还有其他需要纠正的错误，我没有注意到？

感谢。

这是用**：

突出显示查询的代码

package com.quiz.quizsample.app;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;


public class MainActivity extends Activity {
    //Called when the activity is first created

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        end = (Button) findViewById(R.id.end);
        initialise();
    }




    private int currentQuestion;
    private  String [] questions;
    private  String [] answerA;
    private  String [] answerB;
    private  String [] answerC;
    private  String [] answerD;
    private  String [] correctAnswer;


    Button answerButton;
    TextView questionView;
    TextView answerView;
    TextView resultView;
    EditText answerText;
    RadioButton A;
    RadioButton B;
    RadioButton C;
    RadioButton D;
    Button end;


    public void initialise()
    {
        questions = new String[]{"Which year did the Isle of Wight festival begin?","Why"};
        answerA = new String[] {"A","1999"};
        answerB = new String[] {"n","k"};
        answerC = new String[] {"n","k"};
        answerD = new String[] {"n","k"};
        correctAnswer = new String[] {"n","k"};


        currentQuestion = 0;
        answerButton = (Button)findViewById(R.id.AnswerButton);

        questionView = (TextView)
        findViewById(R.id.QuestionTextView);
        A = (RadioButton) findViewById(R.id.radioButtonA);
        B = (RadioButton) findViewById(R.id.radioButtonB);
        C = (RadioButton) findViewById(R.id.radioButtonC);
        D = (RadioButton) findViewById(R.id.radioButtonD);
        answerView = (TextView)findViewById(R.id.AnswerTextView);
        answerText = (EditText)findViewById(R.id.AnswerText);

    }

        public void **showQuestion()**
    {
        currentQuestion=0;
        if(currentQuestion<10)

        currentQuestion++;
            questionView.setText(currentQuestion+1);
            A.setText(answerA[currentQuestion+1]);
            B.setText(answerB[currentQuestion+1]);
            C.setText(answerC[currentQuestion+1]);
            D.setText(answerD[currentQuestion+1]);





        answerButton.setOnClickListener(new View.OnClickListener()

        {
            @Override
            public void onClick(View view) {
                checkAnswer();
            }
        });


        questionView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                RadioGroup grp = (RadioGroup) findViewById(R.id.radioGroup1);
                RadioButton **answer** = (RadioButton) findViewById(grp.getCheckedRadioButtonId());
                showQuestion();
            }
        });

    }//This method increments currentQuestion index, checks if it equal to the size of the array and rest if necessary



    public void **getCountQuestion**()
    {
        int countQuestion=0;
        if(countQuestion<10)
            countQuestion++;
            questionView.setText(questions[countQuestion]);`enter code here`




        answerView.setText("");
        answerText.setText("");
    }

    public boolean isCorrect(String answer)
    {
        return (answer.equalsIgnoreCase(correctAnswer[currentQuestion]));
    }



    public void checkAnswer()
    {
        String answer = answerText.getText().toString();
        if(isCorrect(answer))
            answerView.setText("You're right!");
        else
            answerView.setText("Sorry, the correct answer is " +correctAnswer[currentQuestion]);

    }

    public void **getResult**()
    {

        int numberCorrectAnswers = 0;
        int **IncorrectAnswers** = 0;
        **IncorrectAnswers** =10 - numberCorrectAnswers;
        numberCorrectAnswers = new int[**correctAnswer**];
        numberCorrectAnswers++;


        {

    if (numberCorrectAnswers >6)

        resultView.setText("Well done, you passed the quiz.");

    }//end if

    {
        if (numberCorrectAnswers <=7)



            resultView.setText("Sorry, you have failed the quiz. Please try again soon.");

    }//end if

    {

    { if (numberCorrectAnswers >=7)

        resultView.setText(" You are a festival expert!");

    else if (numberCorrectAnswers <2 )

        resultView.setText("You must think that music begins and ends with Oasis. Please try harder next time!");

    else if (numberCorrectAnswers <4)

        resultView.setText ("You need to get out more to festivals!");

    else
        resultView.setText("Not bad for a first try");
    }
}
}
}//class

Answer 1

你声明了错误的答案，你指定了错误的答案。但那时你什么都不做。如果它只是持有一个值，但没有其他任何关心，Java编译器将完全按照它应该做的 - 告诉你它没有被使用，并且可能不会为它生成代码。

Android / Java-为什么不使用这些？

1 个答案: