Codelab Step 7 - Messages never load

[kvizcarra]

After completing Step 7 and updating the database in the Firebase console, the loading spinner is never hidden and the messages never load. The same happens with the completed sample app friendlychat-android/android/.

[samtstern]

@kvizcarra do you see any errors in the logs at all? What security rules do you have set on your database?

[kvizcarra]

When running the complete app, I don't get any errors but I get this for logcat filter Warn:

01-24 20:21:39.432 1004-1004/? W/zygote64: Unsupported class loader
01-24 20:21:39.434 1004-1004/? W/zygote64: Skipping duplicate class check due to unsupported classloader
01-24 20:21:39.439 1004-1004/? W/DynamiteModule: Local module descriptor class for com.google.firebase.auth not found.
01-24 20:21:39.443 1004-1004/? W/DynamiteModule: Local module descriptor class for com.google.firebase.auth not found.
01-24 20:21:39.479 1004-1048/? W/DynamiteModule: Local module descriptor class for com.google.firebase.auth not found.
01-24 20:21:39.563 1004-1052/? W/DynamiteModule: Local module descriptor class for com.google.android.gms.crash not found.
01-24 20:21:39.603 1004-1052/? W/zygote64: Unsupported class loader
01-24 20:21:39.741 1004-1053/? W/DynamiteModule: Local module descriptor class for com.google.android.gms.crash not found.
01-24 20:21:40.176 1004-1004/com.google.firebase.codelab.friendlychat W/zygote64: Unsupported class loader

I used the same rules given in Step 6:

{
  "rules": {
    ".read": "auth != null",
    ".write": "auth != null"
  }
}

[samtstern]

@kvizcarra we can ignore the W/DynamiteModule: Local module descriptor class for com.google.firebase.auth not found. logs, those are unrelated.

Thanks for posting your rules, I'll have to think about what could be going wrong here.

[samtstern]

Could you try doing a read from mFirebaseDatabaseReference.child(MESSAGES_CHILD) without using the recycler adapter and see if your app can read the data? Just attach a ValueEventListener and see what comes back.

[kvizcarra]

I added this under the existing mFirebaseDatabaseReference.child(MESSAGES_CHILD) line in MainActivity.onCreate() but my loggers never fired.

DatabaseReference messagesRef = mFirebaseDatabaseReference.child(MESSAGES_CHILD);
messagesRef.addValueEventListener(new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        Log.d("**DEBUG-DEBUG-DEBUG**", dataSnapshot.getValue(FriendlyMessage.class).toString());
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {
        Log.d("**DEBUG-DEBUG-DEBUG**", databaseError.getMessage());
    }
});

[gs-ts]

I can confirm the same issue.

[prince-28]

Same issue i am also facing. but my app is getting crashing and throwing null pointer exception.

Below is my Error Log:

com.google.firebase.codelab.friendlychat E/AndroidRuntime: FATAL EXCEPTION: main Process: com.google.firebase.codelab.friendlychat, PID: 6451 java.lang.NullPointerException: null reference at com.google.android.gms.common.internal.Preconditions.checkNotNull(Unknown Source) at com.google.firebase.appindexing.Action$Builder.setObject(Unknown Source) at com.google.firebase.codelab.friendlychat.MainActivity.getMessageViewAction(MainActivity.java:448) at com.google.firebase.codelab.friendlychat.MainActivity.access$200(MainActivity.java:72) at com.google.firebase.codelab.friendlychat.MainActivity$2.onBindViewHolder(MainActivity.java:229) at com.google.firebase.codelab.friendlychat.MainActivity$2.onBindViewHolder(MainActivity.java:173) at com.firebase.ui.database.FirebaseRecyclerAdapter.onBindViewHolder(FirebaseRecyclerAdapter.java:122) at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:6673) at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:6714) at android.support.v7.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:5647) at android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:5913) at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5752) at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5748) at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2232) at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1559) at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1519) at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:589) at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3812) at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3529) at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:4082) at android.view.View.layout(View.java:17523) at android.view.ViewGroup.layout(ViewGroup.java:5612) at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1079) at android.view.View.layout(View.java:17523) at android.view.ViewGroup.layout(ViewGroup.java:5612) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) at android.widget.FrameLayout.onLayout(FrameLayout.java:261) at android.view.View.layout(View.java:17523) at android.view.ViewGroup.layout(ViewGroup.java:5612) at android.support.v7.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:443) at android.view.View.layout(View.java:17523) at android.view.ViewGroup.layout(ViewGroup.java:5612) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) at android.widget.FrameLayout.onLayout(FrameLayout.java:261) at android.view.View.layout(View.java:17523) at android.view.ViewGroup.layout(ViewGroup.java:5612) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585) at android.widget.LinearLayout.onLayout(LinearLayout.java:1494) at android.view.View.layout(View.java:17523) at android.view.ViewGroup.layout(ViewGroup.java:5612) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) at android.widget.FrameLayout.onLayout(FrameLayout.java:261) at com.android.internal.policy.DecorView.onLayout(DecorView.java:724) at android.view.View.layout(View.java:17523) at android.view.ViewGroup.layout(ViewGroup.java:5612) at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2342) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2069) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1246) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6301) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:871) at android.view.Choreographer.doCallbacks(Choreographer.java:683) at android.view.Choreographer.doFrame(Choreographer.java:619) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:857) at android.os.Handler.handleCallback(Handler.java:751) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6077) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)

[ztsorojev]

Same issue. My logcat shows several warnings:

05-08 20:24:02.107 7910-8118/com.google.firebase.codelab.friendlychat E/OpenGLRenderer: allen debug liyu Key: 0 05-08 20:24:02.120 7910-8118/com.google.firebase.codelab.friendlychat E/OpenGLRenderer: allen debug liyu Key: 68724719680 05-08 20:24:02.121 7910-8118/com.google.firebase.codelab.friendlychat E/OpenGLRenderer: allen debug liyu Key: 1 05-08 20:24:02.123 7910-8118/com.google.firebase.codelab.friendlychat E/OpenGLRenderer: allen debug liyu Key: 5242945 05-08 20:24:02.126 7910-8118/com.google.firebase.codelab.friendlychat E/OpenGLRenderer: allen debug liyu Key: 34359738371 05-08 20:24:02.130 7910-8118/com.google.firebase.codelab.friendlychat E/OpenGLRenderer: allen debug liyu Key: 240518168576

[vegatroz]

@prince-28 have u succeeded to add messages node/child to your database? If yes maybe you can add one line code to your FriendlyMessage.java (under public class FriendlyMessage): public FriendlyMessage() {}

[rrewind]

After completing Step 7 and updating the database in the Firebase console, the loading spinner is never hidden and the messages never load. The same happens with the completed sample app friendlychat-android/android/.

same issue here