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POandroid - How to enable a next level on a Quiz?
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  1. POandroid - How to enable a next level on a Quiz?
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    copied!<p>I'm new to Android app development, I'm doing a quiz app, that has categories and levels, and I have to leave only the first level of each category enabled, the next level is enabled when the user answers the question correctly, but, I don't know how to do this. Could you help me? P.S.: My database has three tables: category, level and questions. I already got it show the questions to the user and pass the questions. Below is my code:</p> <pre><code>public void verifyAnswer(String answer){ if(qCurrent.getAnswer().equals(answer)){ if(qid&lt;5){ qCurrent = qList.get(qid); setQuestions(); } else{ showMsgWin(); //here the code to unlock the next level Button level2 = (Button)findViewById(R.id.imgBtnNivel2); level2.setEnabled(true); } } else { showMsgLose(); } } </code></pre> <p>My activityLevels:</p> <pre><code> ImageButton btnNivel1 = (ImageButton)findViewById(R.id.imgBtnNivel1); ImageButton btnNivel2 = (ImageButton)findViewById(R.id.imgBtnNivel2); ImageButton btnNivel3 = (ImageButton)findViewById(R.id.imgBtnNivel3); ImageButton btnNivel4 = (ImageButton)findViewById(R.id.imgBtnNivel4); ImageButton btnNivel5 = (ImageButton)findViewById(R.id.imgBtnNivel5); ImageButton btnNivel6 = (ImageButton)findViewById(R.id.imgBtnNivel6); btnNivel1.setEnabled(true); btnNivel2.setEnabled(false); btnNivel3.setEnabled(false); btnNivel4.setEnabled(false); btnNivel5.setEnabled(false); btnNivel6.setEnabled(false); </code></pre> <p>Error:</p> <pre><code>10-06 03:56:15.382: E/AndroidRuntime(338): FATAL EXCEPTION: main 10-06 03:56:15.382: E/AndroidRuntime(338): java.lang.NullPointerException </code></pre>
 

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