java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.appcompat.app.ActionBar.hide()' on a null object reference

Question

Hi i have made a simple food ordering app , but When I start it , it crashes and the error thrown in Logcat is this.Please Help Me out...

 05-18 17:26:41.104 18166-18166/com.example.sample E/AndroidRuntime: FATAL EXCEPTION: main
 Process: com.example.sample, PID: 18166

 java.lang.RuntimeException: Unable to start activity > 

ComponentInfo{com.example.sample/com.example.sample.MainActivity}: java.lang.NullPointerException: > 

Attempt to invoke virtual method 'void androidx.appcompat.app.ActionBar.hide()' on a null object

reference

   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2487)
   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2547)
   at android.app.ActivityThread.access$1100(ActivityThread.java:151)
   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1398)
   at android.os.Handler.dispatchMessage(Handler.java:102)
   at android.os.Looper.loop(Looper.java:157)
   at android.app.ActivityThread.main(ActivityThread.java:5603)
   at java.lang.reflect.Method.invoke(Native Method)
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:774)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:652)

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void > > > 


androidx.appcompat.app.ActionBar.hide()' on a null object reference
     at com.example.sample.MainActivity.onCreate(MainActivity.java:39)
     at android.app.Activity.performCreate(Activity.java:6355)
     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1108)
   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2440)
   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2547) 
   at android.app.ActivityThread.access$1100(ActivityThread.java:151) 
   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1398) 
   at android.os.Handler.dispatchMessage(Handler.java:102) 
   at android.os.Looper.loop(Looper.java:157) 
   at android.app.ActivityThread.main(ActivityThread.java:5603) 
   at java.lang.reflect.Method.invoke(Native Method) 
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:774) 
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:652)

Entire code - Github.

Hope You Have All Required Files , ask me if not there. Please Help!!!!

Always mention Your error module that where you are getting null pointer exception — Krishna Sony
– Krishna Sony, Commented May 18, 2020 at 13:13

Krishna Sony · Accepted Answer · 2020-05-18 13:12:10Z

1

In your MainActivity you use getSupportActionBar().hide(); but in your style.xml showing you set no actionbar.

   <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

Either Add toolbar in your activity or add DarkActionBar instead of NoActionBar

answered May 18, 2020 at 13:12

Krishna Sony

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