0

我正在做 android 测验。我有 4 个按钮和逻辑来检查单击任何按钮时我的答案是对还是错。但它不工作。

public class QuestionActivity extends Activity implements OnClickListener{

    private Question currentQ;
    private GamePlay currentGame;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.question);
        /**
         * Configure current game and get question
         */
        currentGame = ((CYKApplication)getApplication()).getCurrentGame();
        currentQ = currentGame.getNextQuestion();
        Button nextBtn1 = (Button) findViewById(R.id.answer1);
        nextBtn1.setOnClickListener(this);
        Button nextBtn2 = (Button) findViewById(R.id.answer2);
        nextBtn2.setOnClickListener(this);
        Button nextBtn3 = (Button) findViewById(R.id.answer3);
        nextBtn3.setOnClickListener(this);
        Button nextBtn4 = (Button) findViewById(R.id.answer4);
        nextBtn4.setOnClickListener(this);
        /**
         * Update the question and answer options..
         */
        setQuestions();

    }


    /**
     * Method to set the text for the question and answers from the current games
     * current question
     */
    private void setQuestions() {
        //set the question text from current question
        String question = Utility.capitalise(currentQ.getQuestion());
        TextView qText = (TextView) findViewById(R.id.question);
        qText.setText(question);

        //set the available options
        List<String> answers = currentQ.getQuestionOptions();
        TextView option1 = (TextView) findViewById(R.id.answer1);
        option1.setText(Utility.capitalise(answers.get(0)));

        TextView option2 = (TextView) findViewById(R.id.answer2);
        option2.setText(Utility.capitalise(answers.get(1)));

        TextView option3 = (TextView) findViewById(R.id.answer3);
        option3.setText(Utility.capitalise(answers.get(2)));

        TextView option4 = (TextView) findViewById(R.id.answer4);
        option4.setText(Utility.capitalise(answers.get(3)));
    }


    @Override
    public void onClick(View arg0) {
        //Log.d("Questions", "Moving to next question");

    if(!checkAnswer()) return;
        /**
         * check if end of game
         */
        if (currentGame.isGameOver()){
            //Log.d("Questions", "End of game! lets add up the scores..");
            //Log.d("Questions", "Questions Correct: " + currentGame.getRight());
            //Log.d("Questions", "Questions Wrong: " + currentGame.getWrong());
            Intent i = new Intent(this, EndgameActivity.class);
            startActivity(i);
            finish();
        }
        else{
            Intent i = new Intent(this, QuestionActivity.class);
            startActivity(i);
            finish();
        }
    }




    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event)
    {
        switch (keyCode)
        {
        case KeyEvent.KEYCODE_BACK :
            return true;
        }

        return super.onKeyDown(keyCode, event);
    }


    /*
      Check if a checkbox has been selected, and if it
      has then check if its correct and update gamescore
     */
    private boolean checkAnswer() {
        String answer = getSelectedAnswer();
        if (answer==null){
            //Log.d("Questions", "No Checkbox selection made - returning");
            return false;
        }
        else {
            //Log.d("Questions", "Valid Checkbox selection made - check if correct");
            if (currentQ.getAnswer().equalsIgnoreCase(answer))
            {
                //Log.d("Questions", "Correct Answer!");
                currentGame.incrementScore();
            }
            else{
                //Log.d("Questions", "Incorrect Answer!");
                currentGame.decrementScore();
            }
            return true;
        }
    }



    private String getSelectedAnswer() {
        Button c1 = (Button)findViewById(R.id.answer1);
        Button c2 = (Button)findViewById(R.id.answer2);
        Button c3 = (Button)findViewById(R.id.answer3);
        Button c4 = (Button)findViewById(R.id.answer4);
        if (c1.callOnClick())
        {
            return c1.getContext().toString();
        }
        if (c2.callOnClick())
        {
            return c2.getContext().toString();
        }
        if (c3.callOnClick())
        {
            return c3.getContext().toString();
        }
        if (c4.callOnClick())
        {
            return c4.getContext().toString();
        }

        return null;
    }

}

日志猫-

09-02 08:17:30.083: E/Trace(2148): error opening trace file: No such file or directory (2)
    09-02 08:17:30.193: D/dalvikvm(2148): GC_FOR_ALLOC freed 65K, 8% free 2413K/2620K, paused 26ms, total 28ms
    09-02 08:17:30.203: I/dalvikvm-heap(2148): Grow heap (frag case) to 4.553MB for 2160016-byte allocation
    09-02 08:17:30.313: D/dalvikvm(2148): GC_FOR_ALLOC freed 1K, 5% free 4521K/4732K, paused 104ms, total 104ms
    09-02 08:17:30.363: D/dalvikvm(2148): GC_CONCURRENT freed <1K, 5% free 4521K/4732K, paused 4ms+3ms, total 50ms
    09-02 08:17:30.832: D/gralloc_goldfish(2148): Emulator without GPU emulation detected.
    09-02 08:17:35.432: D/dalvikvm(2148): GC_FOR_ALLOC freed 17K, 4% free 4988K/5148K, paused 42ms, total 45ms
    09-02 08:17:35.482: I/dalvikvm-heap(2148): Grow heap (frag case) to 7.068MB for 2160016-byte allocation
    09-02 08:17:35.562: D/dalvikvm(2148): GC_CONCURRENT freed 4K, 3% free 7092K/7260K, paused 4ms+4ms, total 77ms
    09-02 08:17:36.512: I/Choreographer(2148): Skipped 764 frames!  The application may be doing too much work on its main thread.
    09-02 08:17:38.682: I/dalvikvm(2148): threadid=1: stack overflow on call to Landroid/view/View;.findViewById:LI
    09-02 08:17:38.682: I/dalvikvm(2148):   method requires 12+20+8=40 bytes, fp is 0x4205a320 (32 left)
    09-02 08:17:38.682: I/dalvikvm(2148):   expanding stack end (0x4205a300 to 0x4205a000)
    09-02 08:17:38.682: I/dalvikvm(2148): Shrank stack (to 0x4205a300, curFrame is 0x4205fec4)
    09-02 08:17:38.682: D/AndroidRuntime(2148): Shutting down VM
    09-02 08:17:38.682: W/dalvikvm(2148): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
    09-02 08:17:39.092: E/AndroidRuntime(2148): FATAL EXCEPTION: main
    09-02 08:17:39.092: E/AndroidRuntime(2148): java.lang.StackOverflowError
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at android.view.ViewGroup.findViewTraversal(ViewGroup.java:3053)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at android.view.View.findViewById(View.java:15104)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at android.view.ViewGroup.findViewTraversal(ViewGroup.java:3053)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at android.view.View.findViewById(View.java:15104)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at android.view.ViewGroup.findViewTraversal(ViewGroup.java:3053)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at android.view.View.findViewById(View.java:15104)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at android.view.ViewGroup.findViewTraversal(ViewGroup.java:3053)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at android.view.View.findViewById(View.java:15104)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at android.view.Window.findViewById(Window.java:900)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at android.app.Activity.findViewById(Activity.java:1839)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.starchazer.cyk.QuestionActivity.getSelectedAnswer(QuestionActivity.java:144)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.starchazer.cyk.QuestionActivity.checkAnswer(QuestionActivity.java:126)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.starchazer.cyk.QuestionActivity.onClick(QuestionActivity.java:85)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at android.view.View.callOnClick(View.java:4222)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.starchazer.cyk.QuestionActivity.getSelectedAnswer(QuestionActivity.java:148)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.starchazer.cyk.QuestionActivity.checkAnswer(QuestionActivity.java:126)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.starchazer.cyk.QuestionActivity.onClick(QuestionActivity.java:85)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at android.view.View.callOnClick(View.java:4222)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.getSelectedAnswer(QuestionActivity.java:148)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.checkAnswer(QuestionActivity.java:126)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.onClick(QuestionActivity.java:85)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at android.view.View.callOnClick(View.java:4222)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.getSelectedAnswer(QuestionActivity.java:148)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.checkAnswer(QuestionActivity.java:126)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.onClick(QuestionActivity.java:85)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at android.view.View.callOnClick(View.java:4222)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.getSelectedAnswer(QuestionActivity.java:148)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.checkAnswer(QuestionActivity.java:126)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.onClick(QuestionActivity.java:85)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at android.view.View.callOnClick(View.java:4222)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.getSelectedAnswer(QuestionActivity.java:148)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.checkAnswer(QuestionActivity.java:126)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.onClick(QuestionActivity.java:85)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at android.view.View.callOnClick(View.java:4222)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.getSelectedAnswer(QuestionActivity.java:148)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.checkAnswer(QuestionActivity.java:126)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.onClick(QuestionActivity.java:85)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at android.view.View.callOnClick(View.java:4222)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.getSelectedAnswer(QuestionActivity.java:148)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.checkAnswer(QuestionActivity.java:126)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.onClick(QuestionActivity.java:85)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at android.view.View.callOnClick(View.java:4222)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.getSelectedAnswer(QuestionActivity.java:148)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.checkAnswer(QuestionActivity.java:126)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.onClick(QuestionActivity.java:85)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at android.view.View.callOnClick(View.java:4222)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.getSelectedAnswer(QuestionActivity.java:148)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.checkAnswer(QuestionActivity.java:126)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.onClick(QuestionActivity.java:85)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at android.view.View.callOnClick(View.java:4222)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.getSelectedAnswer(QuestionActivity.java:148)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.checkAnswer(QuestionActivity.java:126)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.onClick(QuestionActivity.java:85)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at android.view.View.callOnClick(View.java:4222)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.getSelectedAnswer(QuestionActivity.java:148)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.checkAnswer(QuestionActivity.java:126)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at com.cyk.QuestionActivity.onClick(QuestionActivity.java:85)
    09-02 08:17:39.092: E/AndroidRuntime(2148):     at android.view.V
    09-02 08:17:39.122: D/dalvikvm(2148): GC_CONCURRENT freed 762K, 11% free 7907K/8812K, paused 69ms+5ms, total 117ms
    09-02 08:17:39.122: D/dalvikvm(2148): WAIT_FOR_CONCURRENT_GC blocked 16ms
    09-02 08:22:39.222: I/Process(2148): Sending signal. PID: 2148 SIG: 9
    09-02 08:22:39.783: E/Trace(2182): error opening trace file: No such file or directory (2)
    09-02 08:22:39.883: D/dalvikvm(2182): GC_FOR_ALLOC freed 68K, 9% free 2413K/2624K, paused 25ms, total 27ms
    09-02 08:22:39.893: I/dalvikvm-heap(2182): Grow heap (frag case) to 4.553MB for 2160016-byte allocation
    09-02 08:22:40.013: D/dalvikvm(2182): GC_FOR_ALLOC freed 1K, 5% free 4521K/4736K, paused 114ms, total 114ms
    09-02 08:22:40.063: D/dalvikvm(2182): GC_CONCURRENT freed <1K, 5% free 4521K/4736K, paused 4ms+3ms, total 49ms
    09-02 08:22:40.513: D/gralloc_goldfish(2182): Emulator without GPU emulation detected.

在上面的代码中，我正在从数据库中检索四个答案按钮的数据。我的数据显示在按钮上。当我点击按钮时，我想检查我的答案是对还是错。在回答了它的下一个问题之后，它是对还是错。

4

3 回答 3

1 
@Override
public void onClick(View arg0) {

    // NEW: pass the received view to checkAnswer
    if(!checkAnswer(arg0)) return;

    if (currentGame.isGameOver()){
        //Log.d("Questions", "End of game! lets add up the scores..");
        //Log.d("Questions", "Questions Correct: " +            currentGame.getRight());
        //Log.d("Questions", "Questions Wrong: " + currentGame.getWrong());
        Intent i = new Intent(this, EndgameActivity.class);
        startActivity(i);
        finish();
    }
    else{
        Intent i = new Intent(this, QuestionActivity.class);
        startActivity(i);
        finish();
    }
}

// NEW: add view as argument to checkAnswer
private boolean checkAnswer(View v) {

    // NEW: retrieve answer from clicked view
    Button b = (Button)v;
    String answer = b.getText().toString();

    // now check if the answer is correct
    if (currentQ.getAnswer().equalsIgnoreCase(answer))  {
        //Log.d("Questions", "Correct Answer!");
        currentGame.incrementScore();
    }
    else  {
        //Log.d("Questions", "Incorrect Answer!");
        currentGame.decrementScore();
    }
    return true;
}

上面的代码所做的是检索被点击的视图并提取它的标题（文本），然后根据正确的答案进行检查。当然，由于您也不能单击其中一个按钮，因此您可能需要检查单击的视图是否确实是按钮之一，如果不是，则应跳过答案检查-我在上面的示例代码中省略了这一点。

于 2013-09-04T08:51:27.353 回答
0

将答案放入字符串变量中并检查按钮对象文本是否与字符串变量中的文本相同，否则错误。

String str = <your answer> ; 
if(<btn object>.getText().toString().equalsTo(str))
  // correct answer
else
  // wrong answer


public class QuestionActivity extends Activity implements OnClickListener{

private Question currentQ;
private GamePlay currentGame;
private String str = "" ; // String to hold question

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.question);
    /**
     * Configure current game and get question
     */
    currentGame = ((CYKApplication)getApplication()).getCurrentGame();
    currentQ = currentGame.getNextQuestion();
    Button nextBtn1 = (Button) findViewById(R.id.answer1);
    nextBtn1.setOnClickListener(this);
    Button nextBtn2 = (Button) findViewById(R.id.answer2);
    nextBtn2.setOnClickListener(this);
    Button nextBtn3 = (Button) findViewById(R.id.answer3);
    nextBtn3.setOnClickListener(this);
    Button nextBtn4 = (Button) findViewById(R.id.answer4);
    nextBtn4.setOnClickListener(this);
    /**
     * Update the question and answer options..
     */
    setQuestions();

}


/**
 * Method to set the text for the question and answers from the current games
 * current question
 */
private void setQuestions() {
    //set the question text from current question
    String question = Utility.capitalise(currentQ.getQuestion());
    // assign correct answer to str variable.
    str = answer ; 
    TextView qText = (TextView) findViewById(R.id.question);
    qText.setText(question);

    //set the available options
    List<String> answers = currentQ.getQuestionOptions();
    TextView option1 = (TextView) findViewById(R.id.answer1);
    option1.setText(Utility.capitalise(answers.get(0)));

    TextView option2 = (TextView) findViewById(R.id.answer2);
    option2.setText(Utility.capitalise(answers.get(1)));

    TextView option3 = (TextView) findViewById(R.id.answer3);
    option3.setText(Utility.capitalise(answers.get(2)));

    TextView option4 = (TextView) findViewById(R.id.answer4);
    option4.setText(Utility.capitalise(answers.get(3)));
}


@Override
public void onClick(View arg0) {
    //Log.d("Questions", "Moving to next question");

if(!checkAnswer()) return;
    /**
     * check if end of game
     */
    if (currentGame.isGameOver()){
        //Log.d("Questions", "End of game! lets add up the scores..");
        //Log.d("Questions", "Questions Correct: " + currentGame.getRight());
        //Log.d("Questions", "Questions Wrong: " + currentGame.getWrong());
        Intent i = new Intent(this, EndgameActivity.class);
        startActivity(i);
        finish();
    }
    else{
        Intent i = new Intent(this, QuestionActivity.class);
        startActivity(i);
        finish();
    }
}




@Override
public boolean onKeyDown(int keyCode, KeyEvent event)
{
    switch (keyCode)
    {
    case KeyEvent.KEYCODE_BACK :
        return true;
    }

    return super.onKeyDown(keyCode, event);
}


/*
  Check if a checkbox has been selected, and if it
  has then check if its correct and update gamescore
 */
private boolean checkAnswer() {
    String answer = getSelectedAnswer();
    if (answer==null){
        //Log.d("Questions", "No Checkbox selection made - returning");
        return false;
    }
    else {
        //Log.d("Questions", "Valid Checkbox selection made - check if correct");
        if (currentQ.getAnswer().equalsIgnoreCase(answer))
        {
            //Log.d("Questions", "Correct Answer!");
            currentGame.incrementScore();
        }
        else{
            //Log.d("Questions", "Incorrect Answer!");
            currentGame.decrementScore();
        }
        return true;
    }
}



private String getSelectedAnswer() {
    Button c1 = (Button)findViewById(R.id.answer1);
    Button c2 = (Button)findViewById(R.id.answer2);
    Button c3 = (Button)findViewById(R.id.answer3);
    Button c4 = (Button)findViewById(R.id.answer4);
    if (c1.callOnClick())
    {
        return c1.getContext().toString();
    }
    if (c2.callOnClick())
    {
        return c2.getContext().toString();
    }
    if (c3.callOnClick())
    {
        return c3.getContext().toString();
    }
    if (c4.callOnClick())
    {
        return c4.getContext().toString();
    }

    return null;
}

}

于 2013-09-02T10:06:20.350 回答
0

尝试改变

c2.getContext().toString();

到

 c2.getText().toString();

所以这应该是

 private String getSelectedAnswer() {
    Button c1 = (Button)findViewById(R.id.answer1);
    Button c2 = (Button)findViewById(R.id.answer2);
    Button c3 = (Button)findViewById(R.id.answer3);
    Button c4 = (Button)findViewById(R.id.answer4);
    if (c1.callOnClick())
    {
        return c1.getText().toString();
    }
    if (c2.callOnClick())
    {
        return c2.getText().toString();
    }
    if (c3.callOnClick())
    {
        return c3.getText().toString();
    }
    if (c4.callOnClick())
    {
        return c4.getText().toString();
    }

    return null;
}
于 2013-09-02T10:07:14.807 回答