— SteemCN

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.

You are expected to improve the post, include the logcat and then submit the relevant parts in the issue tracker on GitHub. If we see that you are not able to do that, we will have to stop reviewing your posts.

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[utopian-moderator]

RE: The application is corrupted when the user searches and turns the screen rotation into landscape.

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