Firebase解析错误

Question

我的模型有什么问题？

我正在使用Android RecyclerViewAdapter。它是一个非常基本的设置 - 大部分都是从GitHub上的android示例中复制的。

错误即时得到：（更新完成登录）

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) 

我的模型类：

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; 

}

火力地堡数据导出通过网站JSON：

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

ViewHo lder连续：

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

感谢您的答案。我刚刚解决了它。

柜面它可以帮助别人：

的问题是，我在错误的方式写的数据。

我做了什么：mRef.child("someChild").setValue(myClass); 这导致直接在“someChild”节点下编写模型数据。

我需要的是：mRef.child("someChild").push().setValue(myClass); 这指示FireBase创建一个新的唯一ID作为topnode来存放modeldata。

我complety忽视它多次:(。

感谢

Answer 2

你应该张贴您的错误日志，以便我们可以得到什么错一个更好的想法。但Firebase使用Jackson ObjectMapper将对象转换为Json，并且它需要您在模型类中有一个空构造函数。