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PONullPointerException Android error
 

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  1. PONullPointerException Android error
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    <p><strong>Ok guys, i have made a quiz test and here is the main quiz activity class.</strong></p> <pre><code>public class startGame extends Activity { List&lt;Integer&gt; list = new LinkedList&lt;Integer&gt;(); CountDownTimer C1,C2; MediaPlayer mp2,mp3; int y = 0; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.startgame); final Button r1 = (Button)findViewById(R.id.b1); final Button r2 = (Button)findViewById(R.id.b2); final Button r3 = (Button)findViewById(R.id.b3); r1.setClickable(false); r2.setClickable(false); r3.setClickable(false); anakatema(); AdView ad = (AdView)findViewById(R.id.ad); ad.loadAd(new AdRequest()); mp2 = MediaPlayer.create(this, R.raw.correct); mp3 = MediaPlayer.create(this, R.raw.wrong); final TextView textic = (TextView) findViewById(R.id.myIVText2); C1 = new CountDownTimer(31000, 1000) { public void onTick(long millisUntilFinished) { textic.setText("" + millisUntilFinished / 1000); } public void onFinish() { textic.setText("0"); if ("1".equals(myMenu.k)) { r1.setBackgroundResource(R.drawable.buttonneocorrect);} if ("2".equals(myMenu.k)) { r2.setBackgroundResource(R.drawable.buttonneocorrect);} if ("3".equals(myMenu.k)) { r3.setBackgroundResource(R.drawable.buttonneocorrect);} myMenu.lives = myMenu.lives - 1; myMenu.streak = 0; myMenu.k = checkFinish(); } public void onCancel() { textic.setText("Oraios!"); } }.start(); myMenu.k = checkFinish(); r1.setOnClickListener (new View.OnClickListener() { public void onClick(View v) { r1.setClickable(false); r2.setClickable(false); r3.setClickable(false); y=0; if ("1".equals(myMenu.k)) { r1.setBackgroundResource(R.drawable.buttonneocorrect); myMenu.score = myMenu.score + 10; myMenu.streak = myMenu.streak + 1; if ("on".equals(myMenu.sound)) {mp2.start();} } else { r1.setBackgroundResource(R.drawable.buttonneowrong); if ("2".equals(myMenu.k)) { r2.setBackgroundResource(R.drawable.buttonneocorrect);} if ("3".equals(myMenu.k)) { r3.setBackgroundResource(R.drawable.buttonneocorrect);} myMenu.lives = myMenu.lives - 1; myMenu.streak = 0; if ("on".equals(myMenu.sound)) {mp3.start();} } C1.cancel(); myMenu.k = checkFinish(); } }); r2.setOnClickListener (new View.OnClickListener() { public void onClick(View v) { r1.setClickable(false); r2.setClickable(false); r3.setClickable(false); y=0; if ("2".equals(myMenu.k)) { r2.setBackgroundResource(R.drawable.buttonneocorrect); myMenu.score = myMenu.score + 10; myMenu.streak = myMenu.streak + 1; if ("on".equals(myMenu.sound)) {mp2.start();} } else { r2.setBackgroundResource(R.drawable.buttonneowrong); if ("1".equals(myMenu.k)) { r1.setBackgroundResource(R.drawable.buttonneocorrect);} if ("3".equals(myMenu.k)) { r3.setBackgroundResource(R.drawable.buttonneocorrect);} myMenu.lives = myMenu.lives - 1; myMenu.streak = 0; if ("on".equals(myMenu.sound)) {mp3.start();} } C1.cancel(); myMenu.k = checkFinish(); } }); r3.setOnClickListener (new View.OnClickListener() { public void onClick(View v) { r1.setClickable(false); r2.setClickable(false); r3.setClickable(false); y=0; if ("3".equals(myMenu.k)) { r3.setBackgroundResource(R.drawable.buttonneocorrect); myMenu.score = myMenu.score + 10; myMenu.streak = myMenu.streak + 1; if ("on".equals(myMenu.sound)) {mp2.start();} } else { r3.setBackgroundResource(R.drawable.buttonneowrong); if ("1".equals(myMenu.k)) { r1.setBackgroundResource(R.drawable.buttonneocorrect);} if ("2".equals(myMenu.k)) { r2.setBackgroundResource(R.drawable.buttonneocorrect);} myMenu.lives = myMenu.lives - 1; myMenu.streak = 0; if ("on".equals(myMenu.sound)) {mp3.start();} } C1.cancel(); myMenu.k = checkFinish(); } }); } public String checkFinish() { String h=""; final AnyDBAdapter eventsData = new AnyDBAdapter(getBaseContext()); myMenu.question = myMenu.question + 1; if (myMenu.streak == 5) { myMenu.lives = myMenu.lives + 1; } String qq = ""+list.get(0); nextQ(); eventsData.open(); final Cursor c = eventsData.ExampleSelect(qq); this.startManagingCursor(c); eventsData.close(); h = c.getString(5); C2 = new CountDownTimer(2000, 1000) { public void onTick(long millisUntilFinished) { } public void onFinish() { if (myMenu.lives != -1) { Button r1 = (Button)findViewById(R.id.b1); r1.setBackgroundResource(R.drawable.buttonneo); Button r2 = (Button)findViewById(R.id.b2); r2.setBackgroundResource(R.drawable.buttonneo); Button r3 = (Button)findViewById(R.id.b3); r3.setBackgroundResource(R.drawable.buttonneo); setQuestions(c); c.close(); C2.cancel(); r1.setClickable(true); r2.setClickable(true); r3.setClickable(true); y = 1; } } }.start(); C1.start(); if (myMenu.lives == -1) { C1.cancel(); finish(); startActivity(new Intent("dv.qtestgr.dvyzual.QuizTestActivity.ENDQUIZGAME")); } return h; } private void anakatema() { int count = getTotalQuestions(); for (int i = 1; i &lt;= count; i++) { list.add(i); } Collections.shuffle(list); } private int getTotalQuestions() { final AnyDBAdapter eventsData = new AnyDBAdapter(getBaseContext()); eventsData.open(); Cursor c = eventsData.countQuestions(); this.startManagingCursor(c); String h = c.getString(0); c.close(); int n = Integer.parseInt(h); eventsData.close(); return n; } private void nextQ() { list.remove(0); if (list.isEmpty()) { anakatema(); } } private void setQuestions(Cursor c) { TextView rscore = (TextView)findViewById(R.id.q1); rscore.setText("Σκορ: " + myMenu.score + " Ερώτηση: " + myMenu.question); TextView rlifes = (TextView)findViewById(R.id.myIVText); rlifes.setText("" + myMenu.lives + ""); TextView r0 = (TextView)findViewById(R.id.textView1); r0.setText(c.getString(1)); Button r1 = (Button)findViewById(R.id.b1); r1.setText(c.getString(2)); Button r2 = (Button)findViewById(R.id.b2); r2.setText(c.getString(3)); Button r3 = (Button)findViewById(R.id.b3); r3.setText(c.getString(4)); } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { //replaces the default 'Back' button action if (y==0){ return true; } if(keyCode==KeyEvent.KEYCODE_BACK) { C1.cancel(); C2.cancel(); finish(); } return true; } } </code></pre> <p><strong>It's working fine but after game ends, and start it for some more times, i have that errors:</strong></p> <pre><code>03-31 23:42:47.841: E/AndroidRuntime(1519): Uncaught handler: thread main exiting due to uncaught exception 03-31 23:42:47.850: E/AndroidRuntime(1519): java.lang.NullPointerException 03-31 23:42:47.850: E/AndroidRuntime(1519): at dv.qtestgr.dvyzual.startGame$4.onClick(startGame.java:139) 03-31 23:42:47.850: E/AndroidRuntime(1519): at android.view.View.performClick(View.java:2364) 03-31 23:42:47.850: E/AndroidRuntime(1519): at android.view.View.onTouchEvent(View.java:4179) 03-31 23:42:47.850: E/AndroidRuntime(1519): at android.widget.TextView.onTouchEvent(TextView.java:6541) 03-31 23:42:47.850: E/AndroidRuntime(1519): at android.view.View.dispatchTouchEvent(View.java:3709) 03-31 23:42:47.850: E/AndroidRuntime(1519): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884) 03-31 23:42:47.850: E/AndroidRuntime(1519): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884) 03-31 23:42:47.850: E/AndroidRuntime(1519): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884) 03-31 23:42:47.850: E/AndroidRuntime(1519): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884) 03-31 23:42:47.850: E/AndroidRuntime(1519): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1659) 03-31 23:42:47.850: E/AndroidRuntime(1519): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1107) 03-31 23:42:47.850: E/AndroidRuntime(1519): at android.app.Activity.dispatchTouchEvent(Activity.java:2061) 03-31 23:42:47.850: E/AndroidRuntime(1519): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1643) 03-31 23:42:47.850: E/AndroidRuntime(1519): at android.view.ViewRoot.handleMessage(ViewRoot.java:1691) 03-31 23:42:47.850: E/AndroidRuntime(1519): at android.os.Handler.dispatchMessage(Handler.java:99) 03-31 23:42:47.850: E/AndroidRuntime(1519): at android.os.Looper.loop(Looper.java:123) 03-31 23:42:47.850: E/AndroidRuntime(1519): at android.app.ActivityThread.main(ActivityThread.java:4363) 03-31 23:42:47.850: E/AndroidRuntime(1519): at java.lang.reflect.Method.invokeNative(Native Method) 03-31 23:42:47.850: E/AndroidRuntime(1519): at java.lang.reflect.Method.invoke(Method.java:521) 03-31 23:42:47.850: E/AndroidRuntime(1519): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 03-31 23:42:47.850: E/AndroidRuntime(1519): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 03-31 23:42:47.850: E/AndroidRuntime(1519): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p><strong>How i can find the mistake? I believe it's something with variable initialization but i am a little blind to find it</strong></p>
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    1. COFirst: do you see how much redundant code you have in your application. Second: Can you highlight or put some indication to the line where the exception is hitting. I can see its line 139, but I am not willing to count to line 139. `at dv.qtestgr.dvyzual.startGame$4.onClick(startGame.java:139)`
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    2. COthx i think i just solved, it was the mediaplayer that i always forget to .release(); when activity ends. And yes my code is a bit complicated as i am new in android develepment ^^ at about 139 line i called the mp2.start so you are right
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