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POhow to increment or decrement scores on answer in android quiz?
 

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  1. POhow to increment or decrement scores on answer in android quiz?
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    <p>i am working on android quiz. i have 4 buttons for answers and text for these answers retriving from database. if correct answer is choosen i want score incremented and if wrong decremented. i have 20 fix rounds in quiz so whether the answer is wrong or right. i want every time round incremented. when we click answer its show answer right or wrong then proceed to next question.</p> <pre><code>questionactivity.class import java.util.List; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.KeyEvent; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.TextView; 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&lt;String&gt; 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 (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.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; } } gameplay.java import java.util.ArrayList; import java.util.List; public class GamePlay { private int numRounds; private int difficulty; private int score; private int round; private List&lt;Question&gt; questions = new ArrayList&lt;Question&gt;(); /** * @return the right */ public int getScore() { return score; } /** * @param right the right to set */ public void setScore(int score) { this.score = score; } /** * @return the round */ public int getRound() { return round; } /** * @param round the round to set */ public void setRound(int round) { this.round = round; } /** * @param difficulty the difficulty to set */ public void setDifficulty(int difficulty) { this.difficulty = difficulty; } /** * @return the difficulty */ public int getDifficulty() { return difficulty; } /** * @param questions the questions to set */ public void setQuestions(List&lt;Question&gt; questions) { this.questions = questions; } /** * @param q the question to add */ public void addQuestions(Question q) { this.questions.add(q); } /** * @return the questions */ public List&lt;Question&gt; getQuestions() { return questions; } public Question getNextQuestion(){ //get the question Question next = questions.get(this.getRound()); //update the round number to the next round this.setRound(this.getRound()+1); return next; } /** * method to increment the number of correct answers this game */ /** * method to increment the number of incorrect answers this game */ public void incrementScore(){ score=score+100; } public void decrementScore() { score=score-50; } /** * @param numRounds the numRounds to set */ public void setNumRounds(int numRounds) { this.numRounds = numRounds; } /** * @return the numRounds */ public int getNumRounds() { return numRounds; } /** * method that checks if the game is over * @return boolean */ public boolean isGameOver(){ return (getRound() &gt;= getNumRounds()); } } question.java import java.util.ArrayList; import java.util.Collections; import java.util.List; public class Question { private String question; private String answer; private String option1; private String option2; private String option3; private int rating; /** * @return the question */ public String getQuestion() { return question; } /** * @param question the question to set */ public void setQuestion(String question) { this.question = question; } /** * @return the answer */ public String getAnswer() { return answer; } /** * @param answer the answer to set */ public void setAnswer(String answer) { this.answer = answer; } /** * @return the rating */ public int getRating() { return rating; } /** * @param rating the rating to set */ public void setRating(int rating) { this.rating = rating; } /** * @return the option1 */ public String getOption1() { return option1; } /** * @param option1 the option1 to set */ public void setOption1(String option1) { this.option1 = option1; } /** * @return the option2 */ public String getOption2() { return option2; } /** * @param option2 the option2 to set */ public void setOption2(String option2) { this.option2 = option2; } /** * @return the option3 */ public String getOption3() { return option3; } /** * @param option3 the option3 to set */ public void setOption3(String option3) { this.option3 = option3; } public List&lt;String&gt; getQuestionOptions(){ List&lt;String&gt; shuffle = new ArrayList&lt;String&gt;(); shuffle.add(answer); shuffle.add(option1); shuffle.add(option2); shuffle.add(option3); Collections.shuffle(shuffle); return shuffle; } } </code></pre> <p>This is my Log File:-</p> <pre><code> 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 &lt;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 &lt;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. </code></pre> <p>please someone help me by correcting my code. thanks in advance.</p>
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    1. USJohn R
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    2. VO
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    1. COUnclear as to what you are actually asking, you seem to be changing the scores properly, however at a guess your problem is a null pointer because you never initialize the value of score.
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      1. USCob50nm
    2. COcan u help me correcting code?
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      1. POhow to increment or decrement scores on answer in android quiz?
      1. USJohn R
    3. COreplace `private int score` with `private static int score = 0;`
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      1. POhow to increment or decrement scores on answer in android quiz?
      1. USCob50nm
 

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