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POAndroid crash in onCreate
 

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  1. POAndroid crash in onCreate
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    <p>Whenever I run my app, the first time I run it from Eclipse it runs fine. But then if I close the app and reopen it it will crash on onCreate. Here is the LogCat:</p> <pre><code>10-10 02:50:00.665: E/AndroidRuntime(29564): FATAL EXCEPTION: main 10-10 02:50:00.665: E/AndroidRuntime(29564): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.appuccino.unitconverter/com.appuccino.unitconverter.MainActivity}: java.lang.NullPointerException 10-10 02:50:00.665: E/AndroidRuntime(29564): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2100) 10-10 02:50:00.665: E/AndroidRuntime(29564): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125) 10-10 02:50:00.665: E/AndroidRuntime(29564): at android.app.ActivityThread.access$600(ActivityThread.java:140) 10-10 02:50:00.665: E/AndroidRuntime(29564): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227) 10-10 02:50:00.665: E/AndroidRuntime(29564): at android.os.Handler.dispatchMessage(Handler.java:99) 10-10 02:50:00.665: E/AndroidRuntime(29564): at android.os.Looper.loop(Looper.java:137) 10-10 02:50:00.665: E/AndroidRuntime(29564): at android.app.ActivityThread.main(ActivityThread.java:4898) 10-10 02:50:00.665: E/AndroidRuntime(29564): at java.lang.reflect.Method.invokeNative(Native Method) 10-10 02:50:00.665: E/AndroidRuntime(29564): at java.lang.reflect.Method.invoke(Method.java:511) 10-10 02:50:00.665: E/AndroidRuntime(29564): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1008) 10-10 02:50:00.665: E/AndroidRuntime(29564): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:775) 10-10 02:50:00.665: E/AndroidRuntime(29564): at dalvik.system.NativeStart.main(Native Method) 10-10 02:50:00.665: E/AndroidRuntime(29564): Caused by: java.lang.NullPointerException 10-10 02:50:00.665: E/AndroidRuntime(29564): at com.appuccino.unitconverter.MainActivity.onCreate(MainActivity.java:37) 10-10 02:50:00.665: E/AndroidRuntime(29564): at android.app.Activity.performCreate(Activity.java:5206) 10-10 02:50:00.665: E/AndroidRuntime(29564): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094) 10-10 02:50:00.665: E/AndroidRuntime(29564): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2064) 10-10 02:50:00.665: E/AndroidRuntime(29564): ... 11 more </code></pre> <p>And the first part of my mainActivity:</p> <pre><code>public class MainActivity extends FragmentActivity implements OnItemSelectedListener { /** * The serialization (saved instance state) Bundle key representing the * current dropdown position. */ private static final String STATE_SELECTED_NAVIGATION_ITEM = "selected_navigation_item"; private Spinner firstSpinner; private Spinner secondSpinner; final String[] mainCategoryChoices = {"Acceleration", "Angles", "Area", "Astronomical", "Clothing", "Computers and Electronics", "Cooking", "Date/Time", "Density", "Energy"}; final String[] subCategoryChoices = {"Acre", "Barn", "Bunder", "Hundred", "Jerib", "Kappland", "Labor", "Ping", "Rai", "Shed", "Sitio", "Square", "Square Mile", "Square Yard"}; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getWindow().requestFeature(Window.FEATURE_ACTION_BAR); //not necessary setContentView(R.layout.activity_main); ArrayAdapter&lt;String&gt; firstAdapter = new ArrayAdapter&lt;String&gt;( MainActivity.this, android.R.layout.simple_dropdown_item_1line, mainCategoryChoices); ArrayAdapter&lt;String&gt; secondAdapter = new ArrayAdapter&lt;String&gt;( MainActivity.this, android.R.layout.simple_dropdown_item_1line, subCategoryChoices); final ActionBar actionBar = getActionBar(); if(actionBar != null) { actionBar.setCustomView(R.layout.action_bar_custom); actionBar.setDisplayShowTitleEnabled(false); actionBar.setDisplayShowCustomEnabled(true); actionBar.setDisplayUseLogoEnabled(false); actionBar.setDisplayShowHomeEnabled(false); } firstSpinner = (Spinner) findViewById(R.id.firstSpinner); secondSpinner = (Spinner) findViewById(R.id.secondSpinner); firstSpinner.setAdapter(firstAdapter); secondSpinner.setAdapter(secondAdapter); firstSpinner.setOnItemSelectedListener(this); secondSpinner.setOnItemSelectedListener(this); } </code></pre> <p>Line 37 that the log info is pointing to goes to the line saying </p> <pre><code>final String[] subCategoryChoices = {"Acre", "Barn", "Bunder", "Hundred", "Jerib", "Kappland", "Labor", "Ping", "Rai", "Shed", "Sitio", "Square", "Square Mile", "Square Yard"}; </code></pre> <p>though when I click on it it goes to the line just above the onCreate(), what could be making it crash?</p>
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    1. COWhat is at line 37?
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    2. COThe LogCat IS pointing at a particular line. It says the Exception is being thrown on line 37.
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    3. COLogcat points to `at com.appuccino.unitconverter.MainActivity.onCreate(MainActivity.java:37)`. There is a NPE there. Show us what line is that and we may provide more accurate help.
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      1. USPlinio.Santos
 

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