Question

Firebase Data Picture

模型

 private String name,rating,ImageUrl,description,maxminutes,minorder,minquaninty;

    public Try_Model() {

    }
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getRating() {
        return rating;
    }

    public void setRating(String rating) {
        this.rating = rating;
    }

    public String getImageUrl() {
        return ImageUrl;
    }

    public void setImageUrl(String imageUrl) {
        ImageUrl = imageUrl;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public String getMaxminutes() {
        return maxminutes;
    }

    public void setMaxminutes(String maxminutes) {
        this.maxminutes = maxminutes;
    }

    public String getMinorder() {
        return minorder;
    }

    public void setMinorder(String minorder) {
        this.minorder = minorder;
    }

    public String getMinquaninty() {
        return minquaninty;
    }

    public void setMinquaninty(String minquaninty) {
        this.minquaninty = minquaninty;
    }
}

MainActivity

    mRecycleriew =findViewById(R.id.my_recycler_view);
    mRecycleriew.setLayoutManager(new LinearLayoutManager(this));



    mFirebaseDatabase=FirebaseDatabase.getInstance();
    mRef=mFirebaseDatabase.getReference().child("restaurants");


}


protected void onStart() {

    super.onStart();
    FirebaseRecyclerAdapter<Try_Model,ViewHolders>firebaseRecyclerAdapter=
            new FirebaseRecyclerAdapter<Try_Model, ViewHolders>(
                    Try_Model.class,
                    R.layout.shop_name_list,
                    ViewHolders.class,
                    mRef)
            {
                @Override
                protected void populateViewHolder(ViewHolders viewHolder, Try_Model model, int position) {


                    viewHolder.setDetails(getApplicationContext(),model.getName(),model.getDescription(),model.getImageUrl(),model.getMaxminutes(),model.getMinorder(),model.getMinquaninty(),model.getRating());

                }
            };
           mRecycleriew.setAdapter(firebaseRecyclerAdapter);
}

ViewHolders

 View mView;

public ViewHolders(View itemView) {

    super(itemView);
    mView=itemView;
}
String name,rating,ImageUrl,description,maxminutes,minorder,minquaninty;
public  void setDetails(Context ctx, String modelName, String name, String description, String ImageUrl, String maxminutes, String minorder, String minquaninty){

    TextView mName=mView.findViewById(R.id.shopTitle);
    TextView mRating=mView.findViewById(R.id.shoprating);
    TextView mDescription=mView.findViewById(R.id.shopdescrpt);
    TextView mMinorder=mView.findViewById(R.id.shopminorder);
    TextView mMaxminutes=mView.findViewById(R.id.shopmaxminutes);
    TextView mMaxQuantity=mView.findViewById(R.id.shopquantityperperson);
    ImageView mImageView = mView.findViewById(R.id.shopimageView);


    mName.setText(name);
    mDescription.setText(description);
    mMaxminutes.setText(maxminutes);
    mMinorder.setText(minorder);
    mMaxQuantity.setText(minquaninty);
    mRating.setText(rating);
    Picasso.with(mView.getContext()).load(ImageUrl).placeholder( R.drawable.progress_animation ).into(mImageView);

}

错误详细信息

com.google.firebase.database.DatabaseException：转换失败 String的java.lang.Long类型的值在com.google.android.gms.internal.firebase_database.zzkt.zzb（未知资源）位于com.google.android.gms.internal.firebase_database.zzkt.zza（未知资源）在com.google.android.gms.internal.firebase_database.zzkt.zzb（未知资源）在com.google.android.gms.internal.firebase_database.zzku.zza（未知资源）在com.google.android.gms.internal.firebase_database.zzkt.zzb（未知资源）位于com.google.android.gms.internal.firebase_database.zzkt.zza（未知资源）位于com.google.firebase.database.DataSnapshot.getValue（未知来源）在com.firebase.ui.database.FirebaseRecyclerAdapter.parseSnapshot（FirebaseRecyclerAdapter.java:151）在com.firebase.ui.database.FirebaseRecyclerAdapter.getItem（FirebaseRecyclerAdapter.java:140）在com.firebase.ui.database.FirebaseRecyclerAdapter.onBindViewHolder（FirebaseRecyclerAdapter.java:183）在android.support.v7.widget.RecyclerView $ Adapter.onBindViewHolder（RecyclerView.java:6673）在android.support.v7.widget.RecyclerView $ Adapter.bindViewHolder（RecyclerView.java:6714）在android.support.v7.widget.RecyclerView $ Recycler.tryBindViewHolderByDeadline（RecyclerView.java:5647）在android.support.v7.widget.RecyclerView $ Recycler.tryGetViewHolderForPositionByDeadline（RecyclerView.java:5913）在android.support.v7.widget.RecyclerView $ Recycler.getViewForPosition（RecyclerView.java:5752）在android.support.v7.widget.RecyclerView $ Recycler.getViewForPosition（RecyclerView.java:5748）在android.support.v7.widget.LinearLayoutManager $ LayoutState.next（LinearLayoutManager.java:2232）在android.support.v7.widget.LinearLayoutManager.layoutChunk（LinearLayoutManager.java:1559）在android.support.v7.widget.LinearLayoutManager.fill（LinearLayoutManager.java:1519）在android.support.v7.widget.LinearLayoutManager.onLayoutChildren（LinearLayoutManager.java:614）在android.support.v7.widget.RecyclerView.dispatchLayoutStep2（RecyclerView.java:3812）在android.support.v7.widget.RecyclerView.dispatchLayout（RecyclerView.java:3529）在android.support.v7.widget.RecyclerView.onLayout（RecyclerView.java:4082）在android.view.View.layout（View.java:16653）在android.view.ViewGroup.layout（ViewGroup.java:5438）在android.widget.LinearLayout.setChildFrame（LinearLayout.java:1743）在android.widget.LinearLayout.layoutVertical（LinearLayout.java:1586）在android.widget.LinearLayout.onLayout（LinearLayout.java:1495）在android.view.View.layout（View.java:16653）

Answer 1

您的rating属性值存储为数字，但是您的代码将其声明为字符串。要修复

private String name,ImageUrl,description,maxminutes,minorder,minquaninty;
private Double rating;

public Try_Model() {

}
public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public Double getRating() {
    return rating;
}

public void setRating(Double rating) {
    this.rating = rating;
}
...

Answer 2

错误就在错误日志的第一行上

com.google.firebase.database.DatabaseException: Failed to convert value of type java.lang.Long to String

尝试将此mRating.setText(rating);更改为此mRating.setText(rating.toString());或此mRating.setText(String.valueOf(rating));

，还将模型类中rating的数据类型更改为double或Double。

让我们看一下结果

在Firebase Recylerview中获取空白屏幕

2 个答案: