Question

我的问题是我的switch语句无法正常工作，因为它不允许我使用bundle extra正确地从我的sqlite数据库中检索数据。

我的目标是，如果您点击“主题1＆＃39;或者＆＃39;主题2＆＃39;按钮它将相关值放入tutorialpage.java中的附加包中，并在quizactivity.java中使用该值，它从sqlite数据库中加载qid的特定值的问题，因此topic1将有qid的问题1-3的主题和topic2将有4-5的qid。

目前没有switch语句，仅使用案例1中的代码，该程序将检索问题，直到给出的值，但是在此程序中它没有正确执行此操作，它当前只显示两个测验的问题1。下一个问题按钮不起作用，当它应该转到所选范围内的下一个问题时，就好像没有onclick方法。

正如您从一些注释掉的部分中看到的那样，我也得到了nullpointerexceptions。

我的文件如下：

tutorialpage.java，教程页面xml有两个按钮，其中包含Topic1和Topic2的id，这是一个switch语句，用于为单击该按钮添加一个额外的intent。

javax.sound.sampled.SourceDataLine

QuizActivity.java，这是Switch语句没有正确检索intent的文件，所以它只是出于某种原因检索第一个问题。

    public void GotoTheQuizButton (View view) {
        Intent intentStart = new Intent(tutorialpage.this, QuizActivity.class);
        Bundle bundle = new Bundle();

        switch(view.getId()) {
            case R.id.Topic1:
             /*   intentStart.putExtra(Quiz_NUMBER, 1);*/
                bundle.putInt(Quiz_NUMBER, 1);
                intentStart.putExtras(bundle);
                break;
            case R.id.Topic2:
         /*       intentStart.putExtra(Quiz_NUMBER, 2);*/
                bundle.putInt(Quiz_NUMBER, 2);
                intentStart.putExtras(bundle);
                break;
        }
        startActivity(intentStart);
    }
}

DBHelper.java这是我的问题存储的地方，我用qid q1-q5标记了问题。

public class QuizActivity extends Activity {
    List<Question> quesList;
    int score=0;
    int qid=0;
    Question currentQ;
    TextView txtQuestion;
    RadioButton rda, rdb, rdc;
    Button butNext;
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_quiz, menu);
        return true;
    }
        private void setQuestionView()
    {
        txtQuestion.setText(currentQ.getQUESTION());
        rda.setText(currentQ.getAnsA());
        rdb.setText(currentQ.getAnsB());
        rdc.setText(currentQ.getAnsC());
        qid++;
    }
        @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_tutorial_quiz);

        DbHelper db=new DbHelper(this);
        quesList=db.getAllQuestions();
        currentQ=quesList.get(qid);
        txtQuestion=(TextView)findViewById(R.id.textView1);
        rda=(RadioButton)findViewById(R.id.radio0);
        rdb=(RadioButton)findViewById(R.id.radio1);
        rdc=(RadioButton)findViewById(R.id.radio2);
        butNext=(Button)findViewById(R.id.button1);
        setQuestionView();



        Intent intent = getIntent();
        Bundle extras = intent.getExtras();

        int Quiz = intent.getIntExtra(tutorialpage.Quiz_NUMBER, 0);
/*
 null pointer exception
 int Quiz = intent.getStringExtra(tutorialpage.Quiz_NUMBER, 0);
                int Quiz = extras.getInt(tutorialpage.Quiz_NUMBER);*/


/*   Check the value being passed to the switch
     Toast login = Toast.makeText(QuizActivity.this, "Welcome " + Quiz, Toast.LENGTH_LONG);
        login.show();*/


        switch(Quiz ) {
            case 1:
                Toast login = Toast.makeText(QuizActivity.this, "Welcome " + Quiz, Toast.LENGTH_LONG);
                login.show();

                butNext.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        RadioGroup grp=(RadioGroup)findViewById(R.id.radioGroup1);
                        RadioButton answer=(RadioButton)findViewById(grp.getCheckedRadioButtonId());
                        Log.d("yourans", currentQ.getANSWER() + " " + answer.getText());
                        if(currentQ.getANSWER().equals(answer.getText()))
                        { score++;  Log.d("score", "Your score" + score); }

                           while (qid < 3){ currentQ=quesList.get(qid);
                            setQuestionView();
                               Intent intent = new Intent(QuizActivity.this, ResultActivity.class);
                               Bundle b = new Bundle();
                               b.putInt("score", score); //Your score
                               intent.putExtras(b); //Put your score to your next Intent
                               startActivity(intent);
                               }
                                finish();
                    }
                });
                break;


            case 2:
                butNext.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        RadioGroup grp = (RadioGroup) findViewById(R.id.radioGroup1);
                        RadioButton answer = (RadioButton) findViewById(grp.getCheckedRadioButtonId());
                        Log.d("yourans", currentQ.getANSWER() + " " + answer.getText());
                        if (currentQ.getANSWER().equals(answer.getText())) {
                            score++;
                            Log.d("score", "Your score" + score);
                        }

                        while (qid >= 4 && qid <= 5) {
                            currentQ = quesList.get(qid);
                            setQuestionView();
                            Intent intent = new Intent(QuizActivity.this, ResultActivity.class);
                            Bundle b = new Bundle();
                            b.putInt("score", score); //Your score
                            intent.putExtras(b); //Put your score to your next Intent
                            startActivity(intent);
                        }
                        finish();
                    }
                });
                break;
        }    
    }
}

我有一个Question.java文件，其中包含问题，ID，答案等的基本getter和setter。

使用switch语句从SQLite数据库中检索值

0 个答案: