This issue could be reproduced. However, I believe that the steps included in the text are not clear enough and I needed to watch the video. Remember that the video is only a complementary material, not the main source for the bug description.
If the app crashes, you need to provide the logcat. You can see the guidelines site if you do not know how to do that. I will give it to you this time but next time, the report may stay without review and score, which means no chance for any reward.
FATAL EXCEPTION: main
Process: org.sw24softwares.starkeverben, PID: 17724
java.lang.RuntimeException: Unable to start activity ComponentInfo
{org.sw24softwares.starkeverben/org.sw24softwares.starkeverben.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ExpandableListView.se
tAdapter(android.widget.ExpandableListAdapter)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2743)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2808)
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:4665)
at android.app.ActivityThread.-wrap19(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1550)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:203)
at android.app.ActivityThread.main(ActivityThread.java:6297)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1084)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:945)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void
android.widget.ExpandableListView.setAdapter(android.widget.ExpandableListAdapter)' on a null object reference
at org.sw24softwares.starkeverben.LessonFragment.search(LessonFragment.java:92)
at org.sw24softwares.starkeverben.MainActivity.handleIntent(MainActivity.java:156)
at org.sw24softwares.starkeverben.MainActivity.onCreate(MainActivity.java:113)
at android.app.Activity.performCreate(Activity.java:6685)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2696)
... 10 more
You shoul improve your English in the post.
application is damaged and out by itself.
- When you publish the post, include the name of the app in the title.
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