Greenrobot EventBus Could Not Dispatch Event
I am using EventBus to communicate from a long running thread to Fragments that update their UI. This long running thread is basically listening for network activity, parsing it and putting events on the bus. I have 2 Fragments set to receive the events.
I am getting a error when I update the Fragments' UIs (a textview) from the Fragments' onEvent method. How do I update the UI in a Fragment from a separate thread?
Here is my code for the Fragments and the logcat output I am seeing...
Logcat:
10-15 02:19:44.637: I/System.out(682): debugger has settled (1440)
10-15 02:19:45.021: V/BRRT(682): start thread
10-15 02:19:45.021: V/BRRT(682): past start thread
10-15 02:19:45.031: V/TEST(682): running thread...
10-15 02:19:45.121: D/Event(682): No subscribers registered for event class com.broadreach.radiotester.io.ExpeditionEvent
10-15 02:19:45.121: D/Event(682): No subscribers registered for event class de.greenrobot.event.NoSubscriberEvent
10-15 02:19:45.261: V/BRRT(682): OneUp event received: 204 : 32
10-15 02:19:45.271: W/ResourceType(682): No package identifier when getting value for resource number 0x00000000
10-15 02:19:45.351: E/Event(682): Could not dispatch event: class com.broadreach.radiotester.io.ExpeditionEvent to subscribing class class com.broadreach.radiotester.screens.OneUpScreen
10-15 02:19:45.351: E/Event(682): android.content.res.Resources$NotFoundException: String resource ID #0x0
10-15 02:19:45.351: E/Event(682): at android.content.res.Resources.getText(Resources.java:247)
10-15 02:19:45.351: E/Event(682): at android.widget.TextView.setText(TextView.java:3428)
10-15 02:19:45.351: E/Event(682): at com.broadreach.radiotester.screens.OneUpScreen.onEvent(OneUpScreen.java:47)
10-15 02:19:45.351: E/Event(682): at java.lang.reflect.Method.invokeNative(Native Method)
10-15 02:19:45.351: E/Event(682): at java.lang.reflect.Method.invoke(Method.java:511)
10-15 02:19:45.351: E/Event(682): at de.greenrobot.event.EventBus.invokeSubscriber(EventBus.java:569)
10-15 02:19:45.351: E/Event(682): at de.greenrobot.event.EventBus.postToSubscription(EventBus.java:500)
10-15 02:19:45.351: E/Event(682): at de.greenrobot.event.EventBus.subscribe(EventBus.java:288)
10-15 02:19:45.351: E/Event(682): at de.greenrobot.event.EventBus.register(EventBus.java:189)
10-15 02:19:45.351: E/Event(682): at de.greenrobot.event.EventBus.registerSticky(EventBus.java:166)
10-15 02:19:45.351: E/Event(682): at com.broadreach.radiotester.screens.OneUpScreen.onResume(OneUpScreen.java:33)
10-15 02:19:45.351: E/Event(682): at android.support.v4.app.Fragment.performResume(Fragment.java:1547)
10-15 02:19:45.351: E/Event(682): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:978)
10-15 02:19:45.351: E/Event(682): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1121)
10-15 02:19:45.351: E/Event(682): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
10-15 02:19:45.351: E/Event(682): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1484)
10-15 02:19:45.351: E/Event(682): at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:482)
10-15 02:19:45.351: E/Event(682): at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:163)
10-15 02:19:45.351: E/Event(682): at android.support.v4.view.ViewPager.populate(ViewPager.java:1073)
10-15 02:19:45.351: E/Event(682): at android.support.v4.view.ViewPager.populate(ViewPager.java:919)
10-15 02:19:45.351: E/Event(682): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1441)
10-15 02:19:45.351: E/Event(682): at android.view.View.measure(View.java:12603)
10-15 02:19:45.351: E/Event(682): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677)
10-15 02:19:45.351: E/Event(682): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
10-15 02:19:45.351: E/Event(682): at android.view.View.measure(View.java:12603)
10-15 02:19:45.351: E/Event(682): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677)
10-15 02:19:45.351: E/Event(682): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1369)
10-15 02:19:45.351: E/Event(682): at android.widget.LinearLayout.measureVertical(LinearLayout.java:660)
10-15 02:19:45.351: E/Event(682): at android.widget.LinearLayout.onMeasure(LinearLayout.java:553)
10-15 02:19:45.351: E/Event(682): at android.view.View.measure(View.java:12603)
10-15 02:19:45.351: E/Event(682): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677)
10-15 02:19:45.351: E/Event(682): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
10-15 02:19:45.351: E/Event(682): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2072)
10-15 02:19:45.351: E/Event(682): at android.view.View.measure(View.java:12603)
10-15 02:19:45.351: E/Event(682): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1044)
10-15 02:19:45.351: E/Event(682): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2418)
10-15 02:19:45.351: E/Event(682): at android.os.Handler.dispatchMessage(Handler.java:99)
10-15 02:19:45.351: E/Event(682): at android.os.Looper.loop(Looper.java:137)
10-15 02:19:45.351: E/Event(682): at android.app.ActivityThread.main(ActivityThread.java:4340)
10-15 02:19:45.351: E/Event(682): at java.lang.reflect.Method.invokeNative(Native Method)
10-15 02:19:45.351: E/Event(682): at java.lang.reflect.Method.invoke(Method.java:511)
10-15 02:19:45.351: E/Event(682): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
10-15 02:19:45.351: E/Event(682): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
10-15 02:19:45.351: E/Event(682): at dalvik.system.NativeStart.main(Native Method)
10-15 02:19:45.351: D/Event(682): No subscribers registered for event class de.greenrobot.event.SubscriberExceptionEvent
10-15 02:19:45.551: V/BRRT(682): FourUp event received: 204 : 32
10-15 02:19:45.561: W/ResourceType(682): No package identifier when getting value for resource number 0x00000000
Here is one of the Fragments (they look the same):
public class OneUpScreen extends ScreenFragment {
private Button name;
private TextView c00Title, c00Data;
//DEBUG
public String title;
//DEBUG
private int counter = 0;
//for logging and convenience
private static final String TAG = "BRRT";
@Override
public void onResume(){
super.onResume();
EventBus.getDefault().registerSticky(this);
}
@Override
public void onPause(){
EventBus.getDefault().unregister(this);
super.onDestroy();
}
//process the bus messaging
public void onEvent(ExpeditionEvent event){
Log.v(TAG, "OneUp event received: " + event.getEventId() + " : " + event.getEventScreenValue());
c00Data = (TextView) getView().findViewById(R.id.c00Data);
c00Data.setText(counter);
counter++;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.one_up_screen_layout, container, false);
name = (Button) v.findViewById(R.id.lblTitle);
c00Title = (TextView) v.findViewById(R.id.c00Title);
c00Data = (TextView) v.findViewById(R.id.c00Data);
Bundle bundle = this.getArguments();
//initial set up of the text on the screen
//null check
name.setText((bundle.getString("name") == null) ? "error" : bundle.getString("name"));
c00Title.setText((bundle.getString("c00Title") == null) ? "error" : bundle.getString("c00Title"));
title = bundle.getString("c00Title");
return v;
}
public OneUpScreen(){
}
public static OneUpScreen newInstance() {
OneUpScreen frag = new OneUpScreen();
return frag;
}
//attach the config for this instance.
@Override
public void setConfig(ScreenConfig sc){
//set up the data to paint the screen for the first time
Bundle b = new Bundle();
//now we have to parse some stuff into a bundle and send the bundle to the fragment
b.putString("name", sc.getName());
b.putString("c00Title", sc.getEvents().get(0).getCleanName());
b.putInt("c00Data", sc.getEvents().get(0).getEventID());
//pass it along
this.setArguments(b);
}
@Override
public void update(SparseArray<String> sensorDataMap) {
Log.v(TAG, "OneUp Update called: " + counter);
counter++;
}
}
The onEvent method is where I am looking here. If you notice in the log, that method does get invoked. But, I am unable to hit the textView inside of it. Originally I was just holding the reference to the textview that I take in the onCreate() method. but I saw and example where you look it up again in the event processing so I moved to that, no luck.
If I take out the:
c00Data.setText(counter);
then everthing works well.
What am I missing here?
Answer
Ok, for anyone who comes here later, here is how I solved this...
It turns out that the key error I was seeing was not the event related error, but the resource related one.
10-15 02:19:45.271: W/ResourceType(682): No package identifier when getting value for resource number 0x00000000
I looked elsewhere on SO and found this:
No package identifier when getting value for resource number
Then I went back into my code and rewrote the TextView.setText() calls to look different.
Old way (counter is an int):
c00Data.setText(counter);
New way:
c00Data.setText(""+counter);
That did it. I whooped.