I am not sure, what is up with this Library, but the results have always been inconsistent(at least for me).
I have ActivityA, ActivityB, FragmentB1 inside ActivityB. I will have to pass a String ID from ActivityA to ActivityB, FragmentB1. Since I am going to have a few more Fragments in ActivityB which also will be in need of this ID, I thought why not use EventBus. So, ActivityA became the Publisher and ActivityB, FragmentB1 became the Subscribers.
Defining the POJO for Event
public class EventUid {
private final String Uid;
public EventUid(String uid) {
Uid = uid;
}
public String getUid() {
return Uid;
}
}
The code for ActivityA is as follows. The following code runs when I select a Spinner Item.
EventBus.getDefault().post(new EventUid(Uid));
The code for ActivityB, FragmentB1 is as follows. First I Register for the Event in onStart().
@Override
public void onStart() {
super.onStart();
EventBus.getDefault().register(this);
}
Then I UnRegister the Event in onStop().
@Override
public void onStop() {
EventBus.getDefault().unregister(this);
super.onStop();
}
Before subscribing to the Event, I define a String in ActivityB and FragmentB1.
private String ProductUid;
Finally, I subscribe to that Event in ActivityB and FragmentB1 as follows.
@Subscribe(threadMode = ThreadMode.MAIN)
public void onEventUid(EventUid event) {
ProductUid = event.getUid();
}
I am not sure where I might have gone wrong, but the ActivityB and FragmentB1 always returns a NullPointerException. Can someone point me the right way?
Thanks
EDIT: Adding LogCat. PS: The Activity, Fragment Names from this Question (named for easier understanding) will be different from LogCat.
--------- beginning of crash
06-10 12:44:20.342 3019-3019/blog.deshki.editor E/AndroidRuntime: FATAL EXCEPTION: main
Process: blog.deshki.editor, PID: 3019
java.lang.RuntimeException: Unable to start activity ComponentInfo{blog.deshki.editor/blog.deshki.editor.screens.media.MediaActivity}: java.lang.NullPointerException: Can't pass null for argument 'pathString' in child()
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.NullPointerException: Can't pass null for argument 'pathString' in child()
at com.google.firebase.database.DatabaseReference.child(Unknown Source)
at blog.deshki.editor.screens.media.MediaActivity.firebaseSettings(MediaActivity.java:291)
at blog.deshki.editor.screens.media.MediaActivity.onCreate_aroundBody0(MediaActivity.java:267)
at blog.deshki.editor.screens.media.MediaActivity$AjcClosure1.run(MediaActivity.java:1)
at org.aspectj.runtime.reflect.JoinPointImpl.proceed(JoinPointImpl.java:149)
at com.frogermcs.androiddevmetrics.aspect.ActivityLifecycleAnalyzer.executeWithTracingIfEnabled(ActivityLifecycleAnalyzer.java:88)
at com.frogermcs.androiddevmetrics.aspect.ActivityLifecycleAnalyzer.ajc$inlineAccessMethod$com_frogermcs_androiddevmetrics_aspect_ActivityLifecycleAnalyzer$com_frogermcs_androiddevmetrics_aspect_ActivityLifecycleAnalyzer$executeWithTracingIfEnabled(ActivityLifecycleAnalyzer.java:1)
at com.frogermcs.androiddevmetrics.aspect.ActivityLifecycleAnalyzer.logAndExecute(ActivityLifecycleAnalyzer.java:66)
at blog.deshki.editor.screens.media.MediaActivity.onCreate(MediaActivity.java:262)
at android.app.Activity.performCreate(Activity.java:6237)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
06-10 12:44:20.358 1279-2221/? E/SurfaceFlinger: ro.sf.lcd_density must be defined as a build property
