Android ActionBar is not visible
I’ve updated API 21, tools, and add-ons, and the ActionBar is no longer visible in some projects. I executed the following code, but the application crashes with a NullPointerException.
ActionBar actionBar = getActionBar();
actionBar.show();
Logcat output
02-23 18:03:36.269: E/AndroidRuntime(3327): FATAL EXCEPTION: main
02-23 18:03:36.269: E/AndroidRuntime(3327): Process: com.example.twaapp, PID: 3327
02-23 18:03:36.269: E/AndroidRuntime(3327): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.twaapp/com.example.twaapp.MainActivity}: java.lang.NullPointerException
02-23 18:03:36.269: E/AndroidRuntime(3327): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2198)
02-23 18:03:36.269: E/AndroidRuntime(3327): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2257)
02-23 18:03:36.269: E/AndroidRuntime(3327): at android.app.ActivityThread.access$800(ActivityThread.java:139)
02-23 18:03:36.269: E/AndroidRuntime(3327): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1210)
02-23 18:03:36.269: E/AndroidRuntime(3327): at android.os.Handler.dispatchMessage(Handler.java:102)
02-23 18:03:36.269: E/AndroidRuntime(3327): at android.os.Looper.loop(Looper.java:136)
02-23 18:03:36.269: E/AndroidRuntime(3327): at android.app.ActivityThread.main(ActivityThread.java:5086)
02-23 18:03:36.269: E/AndroidRuntime(3327): at java.lang.reflect.Method.invokeNative(Native Method)
02-23 18:03:36.269: E/AndroidRuntime(3327): at java.lang.reflect.Method.invoke(Method.java:515)
02-23 18:03:36.269: E/AndroidRuntime(3327): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
02-23 18:03:36.269: E/AndroidRuntime(3327): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
02-23 18:03:36.269: E/AndroidRuntime(3327): at dalvik.system.NativeStart.main(Native Method)
02-23 18:03:36.269: E/AndroidRuntime(3327): Caused by: java.lang.NullPointerException
02-23 18:03:36.269: E/AndroidRuntime(3327): at com.example.twaapp.MainActivity.onCreate(MainActivity.java:82)
02-23 18:03:36.269: E/AndroidRuntime(3327): at android.app.Activity.performCreate(Activity.java:5248)
02-23 18:03:36.269: E/AndroidRuntime(3327): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1110)
02-23 18:03:36.269: E/AndroidRuntime(3327): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2162)
02-23 18:03:36.269: E/AndroidRuntime(3327): … 11 more
How to make AB visible?
Solution
Your Activity class should be extended like this:
public class MainActivity extends ActionBarActivity{
....
}
Replace
public class MainActivity extends FragmentActivity{
....
}
Also, you need to call
ActionBar = getSupportActionBar();
Replace
ActionBar = getActionBar();
Try this. This will work.