Firebase解析錯誤

我的模型有什麼問題？Firebase解析錯誤

我正在使用Android RecyclerViewAdapter。它是一個非常基本的設置 - 大部分都是從GitHub上的android示例中複製的。

錯誤即時得到：（更新完成登錄）

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)

我的模型類：

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;

}

火力地堡數據導出通過網站JSON：

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

ViewHo lder連續：

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()); 
    } 
}

來源

2016-07-07 Hannes

是在'PostModel.java'定義的類？或者是一個內部類的別的東西嗎？這也將有助於看到代碼實際上調用'snapshot.getValue（PostModel.class）'和附加一個偵聽器的引用 –

請粘貼你的Activity和ViewHolder的代碼 –

感謝您的答案。我剛剛解決了它。

櫃面它可以幫助別人：

的問題是，我在錯誤的方式寫的數據。

我做了什麼：mRef.child("someChild").setValue(myClass); 這導致直接在「someChild」節點下編寫模型數據。

我需要的是：mRef.child("someChild").push().setValue(myClass); 這指示FireBase創建一個新的唯一ID作爲topnode來存放modeldata。

我complety忽視它多次:(。

感謝

來源

2016-07-08 17:06:02 Hannes

你應該張貼您的錯誤日誌，以便我們可以得到什麼錯一個更好的想法。但Firebase使用Jackson ObjectMapper將對象轉換爲Json，並且它需要您在模型類中有一個空構造函數。

來源

2016-07-07 18:55:24

如果你沒有在類中定義任何構造函數，Java編譯器將會添加一個默認的無參構造函數，因此編譯後的類將具有必需的構造函數。 –

Firebase解析錯誤

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