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PONullPointerException Android
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copied!<p>While running the application I'm getting these errors</p> <blockquote> <p>10-09 10:20:57.138: ERROR/AndroidRuntime(282): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.rika/com.rika.LatihanActivity}: java.lang.NullPointerException</p> <p>10-09 10:20:57.138: ERROR/AndroidRuntime(282): Caused by: java.lang.NullPointerException</p> </blockquote> <p>Please anyone help me to solve this problem.</p> <p>Its the activity class</p> <pre><code>public class LatihanActivity extends Activity{ private RadioButton radioButton; private TextView quizQuestion; private int rowIndex = 1; private int questNo=0; private boolean checked=false; private boolean flag=true; private RadioGroup radioGroup; String[] corrAns = new String[5]; final DatabaseHelper db = new DatabaseHelper(this); Cursor c1; Cursor c2; Cursor c3; int counter=1; String label; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); String options[] = new String[19]; final RadioGroup radiogroup = (RadioGroup) findViewById(R.id.rdbGp1); // layout params to use when adding each radio button LinearLayout.LayoutParams layoutParams = new RadioGroup.LayoutParams( RadioGroup.LayoutParams.WRAP_CONTENT, RadioGroup.LayoutParams.WRAP_CONTENT); try { db.createDataBase(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } quizQuestion = (TextView) findViewById(R.id.TextView01); displayQuestion(); /*Displays the next options and sets listener on next button*/ Button btnNext = (Button) findViewById(R.id.btnNext); btnNext.setOnClickListener(btnNext_Listener); /*Saves the selected values in the database on the save button*/ Button btnSave = (Button) findViewById(R.id.btnSave); btnSave.setOnClickListener(btnSave_Listener); c3 = db.getCorrAns(); for (int i=0;i<=4;i++) { corrAns[i]=c3.getString(0); c3.moveToNext(); } radioGroup = (RadioGroup) findViewById(R.id.rdbGp1); radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() { @Override public void onCheckedChanged(RadioGroup group, int checkedId) { // TODO Auto-generated method stub for(int i=0; i<radiogroup.getChildCount() ; i++) { RadioButton btn = (RadioButton) radioGroup.getChildAt(i); String text; if (btn.isPressed() && btn.isChecked() && questNo < 5) { Log.e("corrAns[questNo]",corrAns[questNo]); if (corrAns[questNo].equals(btn.getText()) && flag==true) { flag=false; checked = true; } else if(checked==true) { flag=true; checked = false; } } } } }); } /*Called when next button is clicked*/ private View.OnClickListener btnNext_Listener= new View.OnClickListener() { @Override public void onClick(View v) { flag=true; checked = false; questNo++; if (questNo < 5) { c1.moveToNext(); displayQuestion(); } } }; private View.OnClickListener btnSave_Listener= new View.OnClickListener() { @Override public void onClick(View v) {} }; private void displayQuestion() { //Fetching data quiz data and incrementing on each click c1=db.getQuiz_Content(rowIndex); c2 =db.getAns(rowIndex++); quizQuestion.setText(c1.getString(0)); radioGroup.removeAllViews(); for (int i=0;i<=3;i++) { //Generating and adding 4 radio buttons dynamically radioButton = new RadioButton(this); radioButton.setText(c2.getString(0)); radioButton.setId(i); c2.moveToNext(); radioGroup.addView(radioButton); } } } </code></pre> <p>All these issues happened when run the application</p> <blockquote> <p>10-09 11:13:15.128: ERROR/HierarchicalStateMachine(68): TetherMaster - unhandledMessage: msg.what=3</p> <p>10-09 11:13:56.556: ERROR/AndroidRuntime(282): FATAL EXCEPTION: main</p> <p>10-09 11:13:56.556: ERROR/AndroidRuntime(282): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.rika/com.rika.LatihanActivity}: java.lang.NullPointerException</p> <p>10-09 11:13:56.556: ERROR/AndroidRuntime(282): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)</p> <p>10-09 11:13:56.556: ERROR/AndroidRuntime(282): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)</p> <p>10-09 11:13:56.556: ERROR/AndroidRuntime(282): at android.app.ActivityThread.access$2300(ActivityThread.java:125)</p> <p>10-09 11:13:56.556: ERROR/AndroidRuntime(282): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)</p> <p>10-09 11:13:56.556: ERROR/AndroidRuntime(282): at android.os.Handler.dispatchMessage(Handler.java:99)</p> <p>10-09 11:13:56.556: ERROR/AndroidRuntime(282): at android.os.Looper.loop(Looper.java:123)</p> <p>10-09 11:13:56.556: ERROR/AndroidRuntime(282): at android.app.ActivityThread.main(ActivityThread.java:4627)</p> <p>10-09 11:13:56.556: ERROR/AndroidRuntime(282): at java.lang.reflect.Method.invokeNative(Native Method)</p> <p>10-09 11:13:56.556: ERROR/AndroidRuntime(282): at java.lang.reflect.Method.invoke(Method.java:521)</p> <p>10-09 11:13:56.556: ERROR/AndroidRuntime(282): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)</p> <p>10-09 11:13:56.556: ERROR/AndroidRuntime(282): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)</p> <p>10-09 11:13:56.556: ERROR/AndroidRuntime(282): at dalvik.system.NativeStart.main(Native Method)</p> <p>10-09 11:13:56.556: ERROR/AndroidRuntime(282): Caused by: java.lang.NullPointerException</p> <p>10-09 11:13:56.556: ERROR/AndroidRuntime(282): at com.rika.LatihanActivity.displayQuestion(LatihanActivity.java:198)</p> <p>10-09 11:13:56.556: ERROR/AndroidRuntime(282): at com.rika.LatihanActivity.onCreate(LatihanActivity.java:69)</p> <p>10-09 11:13:56.556: ERROR/AndroidRuntime(282): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)</p> <p>10-09 11:13:56.556: ERROR/AndroidRuntime(282): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)</p> <p>10-09 11:13:56.556: ERROR/AndroidRuntime(282): ... 11 more</p> </blockquote>

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