CODEWITHSUNDEEP
androidandroid-activity
cryptic
cryptic

Reputation: 168

Getting the null pointer exception in the getActionBar method

I have use menu items on the action bar. but while getting it in the on create method it giving me the null pointer exception. Please help

Thanks

here is the oncreate method code

    // TODO Auto-generated method stub
    super.onCreate(paramBundle);
    setContentView(R.layout.activity_home);


     final ActionBar localActionBar=getActionBar();
     localActionBar.setNavigationMode(2);
     this.mSectionsPagerAdapter = new SectionsPagerAdapter(getFragmentManager());
     this.mViewPager = ((ViewPager)findViewById(R.id.pager));
     this.mViewPager.setAdapter(this.mSectionsPagerAdapter);
        this.mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener()
        {
             public void onPageSelected(int paramAnonymousInt)
             {
               localActionBar.setSelectedNavigationItem(paramAnonymousInt);
             }
           });
        for (int i = 0; i < this.mSectionsPagerAdapter.getCount(); i++) 
        {
            localActionBar.addTab(localActionBar.newTab().setText(this.mSectionsPagerAdapter.getPageTitle(i)).setTabListener(this));
        }

}

and the Log cat errors

log01-15 13:37:09.092: E/AndroidRuntime(15604): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.chronos.cricketgraph/com.chronos.cricketgraph.HomeActivity}: java.lang.NullPointerException
01-15 13:37:09.092: E/AndroidRuntime(15604):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2114)
01-15 13:37:09.092: E/AndroidRuntime(15604):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2139)
01-15 13:37:09.092: E/AndroidRuntime(15604):    at android.app.ActivityThread.access$700(ActivityThread.java:143)
01-15 13:37:09.092: E/AndroidRuntime(15604):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1241)
01-15 13:37:09.092: E/AndroidRuntime(15604):    at android.os.Handler.dispatchMessage(Handler.java:99)
01-15 13:37:09.092: E/AndroidRuntime(15604):    at android.os.Looper.loop(Looper.java:137)
01-15 13:37:09.092: E/AndroidRuntime(15604):    at android.app.ActivityThread.main(ActivityThread.java:4960)
01-15 13:37:09.092: E/AndroidRuntime(15604):    at java.lang.reflect.Method.invokeNative(Native Method)
01-15 13:37:09.092: E/AndroidRuntime(15604):    at java.lang.reflect.Method.invoke(Method.java:511)
01-15 13:37:09.092: E/AndroidRuntime(15604):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
01-15 13:37:09.092: E/AndroidRuntime(15604):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
01-15 13:37:09.092: E/AndroidRuntime(15604):    at dalvik.system.NativeStart.main(Native Method)
01-15 13:37:09.092: E/AndroidRuntime(15604): Caused by: java.lang.NullPointerException
01-15 13:37:09.092: E/AndroidRuntime(15604):    at com.chronos.cricketgraph.HomeActivity.onCreate(HomeActivity.java:48)
01-15 13:37:09.092: E/AndroidRuntime(15604):    at android.app.Activity.performCreate(Activity.java:5203)
01-15 13:37:09.092: E/AndroidRuntime(15604):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
'

Upvotes: 3

Views: 2053

Answers (5)

Andrea Ascari
Andrea Ascari

Reputation: 21

Use a theme for your application that provides the AcionBar, maybe you can include the appcompact support library.

You can give a look at this post:

Upvotes: 1

Mann
Mann

Reputation: 661

Try to use the getSupportedActionBar-Method. I think you use another version of android

Upvotes: 0

Eoin
Eoin

Reputation: 4066

Did you extend ActionBarActivity?

public class MainActivity extends FragmentActivity implements ActionBar.TabListener{


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    final ActionBar actionBar = getActionBar();
    actionBar.show(); 
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
    ...
}

Upvotes: 1

Arturo
Arturo

Reputation: 261

Depends of your version (in Manifest) you need to use getSupportActionBar(); or getActionBar();. Also are you sure what your homeActivy are extending from an Activity.class ?

Upvotes: 0

marcinj
marcinj

Reputation: 49986

If you use Theme.AppCompat, then extend ActionBarActivity. Also use getSupportActionBar() instead of getActionBar(). You might also need to enable title (but I am not sure if thats true for all android versions) - so requestWindowFeature(Window.FEATURE_NO_TITLE); should be removed - do you have in your theme:

<item name="windowActionBar">false</item>
<item name="android:windowNoTitle">true</item>

by any chance.

Upvotes: 1

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