CODEWITHSUNDEEP
androidandroid-actionbar
KC Chai
KC Chai

Reputation: 1617

Android Hiding ActionBar

I'm trying to hide my action bar. Please check on my codes. It doesnt seems to work. I've also list out my LOGCAT at the bottom of my codes. Please help.

MainActivity.java

public class MainActivity extends SherlockFragmentActivity {

        @Override
        public void onCreate(Bundle savedInstanceState) {
            requestWindowFeature(Window.FEATURE_NO_TITLE);
            super.onCreate(savedInstanceState);

            ActionBar actionBar = getSupportActionBar();
            actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

            actionBar.setDisplayShowTitleEnabled(true);

            Tab tab = actionBar.newTab()
                                .setText("Android")
                                .setTabListener(new AndroidFragment())
                                .setIcon(R.drawable.android);

            actionBar.addTab(tab);

            tab = actionBar.newTab()
                    .setText("Apple")
                    .setTabListener(new AppleFragment())
                    .setIcon(R.drawable.apple);

            actionBar.addTab(tab);


        }  

    }

LOGCAT :

10-06 18:17:25.781: E/AndroidRuntime(15962): FATAL EXCEPTION: main
10-06 18:17:25.781: E/AndroidRuntime(15962): java.lang.RuntimeException: Unable to start activity ComponentInfo{in.wptrafficanalyzer.actionbarsherlocknavtab/in.wptrafficanalyzer.actionbarsherlocknavtab.MainActivity}: java.lang.NullPointerException
10-06 18:17:25.781: E/AndroidRuntime(15962):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1970)
10-06 18:17:25.781: E/AndroidRuntime(15962):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1995)
10-06 18:17:25.781: E/AndroidRuntime(15962):    at android.app.ActivityThread.access$600(ActivityThread.java:127)
10-06 18:17:25.781: E/AndroidRuntime(15962):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1161)
10-06 18:17:25.781: E/AndroidRuntime(15962):    at android.os.Handler.dispatchMessage(Handler.java:99)
10-06 18:17:25.781: E/AndroidRuntime(15962):    at android.os.Looper.loop(Looper.java:137)
10-06 18:17:25.781: E/AndroidRuntime(15962):    at android.app.ActivityThread.main(ActivityThread.java:4512)
10-06 18:17:25.781: E/AndroidRuntime(15962):    at java.lang.reflect.Method.invokeNative(Native Method)
10-06 18:17:25.781: E/AndroidRuntime(15962):    at java.lang.reflect.Method.invoke(Method.java:511)
10-06 18:17:25.781: E/AndroidRuntime(15962):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:982)
10-06 18:17:25.781: E/AndroidRuntime(15962):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:749)
10-06 18:17:25.781: E/AndroidRuntime(15962):    at dalvik.system.NativeStart.main(Native Method)
10-06 18:17:25.781: E/AndroidRuntime(15962): Caused by: java.lang.NullPointerException
10-06 18:17:25.781: E/AndroidRuntime(15962):    at in.wptrafficanalyzer.actionbarsherlocknavtab.MainActivity.onCreate(MainActivity.java:19)
10-06 18:17:25.781: E/AndroidRuntime(15962):    at android.app.Activity.performCreate(Activity.java:4465)
10-06 18:17:25.781: E/AndroidRuntime(15962):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1052)
10-06 18:17:25.781: E/AndroidRuntime(15962):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1934)
10-06 18:17:25.781: E/AndroidRuntime(15962):    ... 11 more

Upvotes: 2

Views: 10401

Answers (1)

Wolfram Rittmeyer
Wolfram Rittmeyer

Reputation: 2402

Well, if you use requestWindowFeature(Window.FEATURE_NO_TITLE); the ActionBar object you read three lines later is null. Thus the NPE.

But why do you hide the ActionBar in this way and then get the object and set tabs and whatnot to an invisible ActionBar?

See also Andrei's comment to your question.

Upvotes: 9

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