Firebase Parsing Error

Question

Whats wrong with my model?

I´m using the Android RecyclerViewAdapter. Its a pretty basic setup - mostly copied from the android examples on GitHub.

Error im getting: (Updated to complete Log)

07-08 18:37:49.324 24650-24650/com.brueller E/DynamiteModule: Failed to load module descriptor class: Didn't find class "com.google.android.gms.dynamite.descriptors.com.google.android.gms.crash.ModuleDescriptor" on path: DexPathList[[zip file "/data/app/com.brueller-2/base.apk"],nativeLibraryDirectories=[/data/app/com.brueller-2/lib/arm64, /vendor/lib64, /system/lib64]]
07-08 18:37:50.392 24650-24650/com.brueller E/MainActivity: LAT: 51.5879459| LONG: 10.2771444
07-08 18:37:52.097 24650-24650/com.brueller E/UncaughtException: com.google.firebase.database.DatabaseException: Can't convert object of type java.lang.String to type com.brueller.model.PostModel
                                                                     at com.google.android.gms.internal.zzaix.zzd(Unknown Source)
                                                                     at com.google.android.gms.internal.zzaix.zzb(Unknown Source)
                                                                     at com.google.android.gms.internal.zzaix.zza(Unknown Source)
                                                                     at com.google.firebase.database.DataSnapshot.getValue(Unknown Source)
                                                                     at com.firebase.ui.database.FirebaseRecyclerAdapter.parseSnapshot(FirebaseRecyclerAdapter.java:147)
                                                                     at com.firebase.ui.database.FirebaseRecyclerAdapter.getItem(FirebaseRecyclerAdapter.java:136)
                                                                     at com.firebase.ui.database.FirebaseRecyclerAdapter.onBindViewHolder(FirebaseRecyclerAdapter.java:176)
                                                                     at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:5471)
                                                                     at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:5504)
                                                                     at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4741)
                                                                     at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4617)
                                                                     at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:1994)
                                                                     at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1390)
                                                                     at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1353)
                                                                     at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:574)
                                                                     at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3028)
                                                                     at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:2906)
                                                                     at android.support.v7.widget.RecyclerView.consumePendingUpdateOperations(RecyclerView.java:1482)
                                                                     at android.support.v7.widget.RecyclerView.access$400(RecyclerView.java:147)
                                                                     at android.support.v7.widget.RecyclerView$ViewFlinger.run(RecyclerView.java:4037)
                                                                     at android.view.Choreographer$CallbackRecord.run(Choreographer.java:886)
                                                                     at android.view.Choreographer.doCallbacks(Choreographer.java:698)
                                                                     at android.view.Choreographer.doFrame(Choreographer.java:630)
                                                                     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:872)
                                                                     at android.os.Handler.handleCallback(Handler.java:743)
                                                                     at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                     at android.os.Looper.loop(Looper.java:150)
                                                                     at android.app.ActivityThread.main(ActivityThread.java:5639)
                                                                     at java.lang.reflect.Method.invoke(Native Method)
                                                                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:805)
                                                                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:695)

My Model Class:

public class PostModel {

public String getPostContent() {
    return mPostContent;
}

public void setPostContent(String mPostContent) {
    this.mPostContent = mPostContent;
}

public Long getTimeStamp() {
    return mTimeStamp;
}

public void setTimeStamp(Long mTimeStamp) {
    this.mTimeStamp = mTimeStamp;
}

public String getPostalCode() {
    return mPostalCode;
}

public void setPostalCode(String mPostalCode) {
    this.mPostalCode = mPostalCode;
}

private String mPostContent;
private Long mTimeStamp;
private String mPostalCode;

}

Firebase Data exported to json via website:

{
  "test" : {
    "postContent" : "hallo",
    "postalCode" : "054587",
    "timeStamp" : 1467915869142
  }
}

ViewHolder:

public class PostHolder extends RecyclerView.ViewHolder {

    @BindView(R.id.PostContent) TextView postContentView;
    @BindView(R.id.TimeString) TextView timeStringView;

    View mView;

    public PostHolder (View itemView) {
        super(itemView);
        mView = itemView;

        ButterKnife.bind(this, mView);
    }

    public void applyModel(PostModel _postModel) {
        postContentView.setText(_postModel.getPostContent());

        // Convert long to nice string
        timeStringView.setText(
            android.text.format.DateUtils.getRelativeTimeSpanString((Long)
                    _postModel.getTimeStamp()).toString());
    }
}

Answer 1

thanks for the answers. I just solved it.

Incase it helps somebody:

The problem was that i wrote the data in the wrong way.

What i did: mRef.child("someChild").setValue(myClass); which results to writing the model-data directly under the "someChild" node.

What i needed: mRef.child("someChild").push().setValue(myClass); This instructs FireBase to create a new unique id as topnode which holds the modeldata.

I complety overlooked it multiple times :(.

Thanks

Answer 2

You should post your error log so we can get a better idea of what's going wrong. But Firebase uses the Jackson ObjectMapper to convert objects to Json and it requires you to have an empty constructor in your model class.