Android Studio/Firestore：Firestore Boolean 在 RecyclerView 中的 TextView 的机会颜色？

Question

在我的 Firestore 云存储中，我在 Products/Productid/ 中得到了这个布尔字段："isOffer".

我想更改我的 RecyclerView ProductItems 中的 TextView 字符串“mPrice”的颜色，关于“isOffer”是真还是假，但我不知道如何处理。

方法 createRecycler():

 public void createRecycler(){
    mRecyclerView = findViewById(R.id.product_selection_list);
    mRecyclerView.setHasFixedSize(true);
    mLayoutManager = new LinearLayoutManager(this);
    Query query = current_productRef.whereEqualTo("isAvailable", true);
    FirestoreRecyclerOptions<product_selection_Item> options = new FirestoreRecyclerOptions.Builder<product_selection_Item>()
            .setQuery(query, product_selection_Item.class)
            .build();
    mAdapter = new product_selection_Adapter(options);

    mRecyclerView.setLayoutManager(mLayoutManager);
    mRecyclerView.setAdapter(mAdapter);

    mAdapter.setOnItemClickListener(new product_selection_Adapter.OnItemClickListener() {
        @Override
        public void OnItemClick(DocumentSnapshot documentSnapshot, int position) {
            String id = documentSnapshot.getId();
            Intent intent = new Intent(product_selection.this, product_fill.class);
            intent.putExtra("Product_ID", id);

            startActivity(intent);
        }
    });
}

我的 Recycler 适配器非常基础：

public class product_selection_Adapter extends FirestoreRecyclerAdapter<product_selection_Item, product_selection_Adapter.product_selection_ViewHolder> {
private OnItemClickListener mListener;

public interface OnItemClickListener {
    void OnItemClick(DocumentSnapshot documentSnapshot, int position);
}

public void setOnItemClickListener(OnItemClickListener listener) {
    mListener = listener;
}


public class product_selection_ViewHolder extends RecyclerView.ViewHolder {
    public TextView mProductname;
    public TextView mFat_Value;
    public TextView mPrice;

    public product_selection_ViewHolder(@NonNull View itemView, final OnItemClickListener listener) {
        super(itemView);
        mProductname = itemView.findViewById(R.id.product_selection_name);
        mFat_Value = itemView.findViewById(R.id.product_selection_fat);
        mPrice = itemView.findViewById(R.id.product_selection_price);

        itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(listener != null) {
                    int position = getAdapterPosition();
                    if (position != RecyclerView.NO_POSITION) {
                        listener.OnItemClick(getSnapshots().getSnapshot(position), position);
                    }
                }
            }
        });
    }
}

public product_selection_Adapter(@NonNull FirestoreRecyclerOptions<product_selection_Item> options) {
    super(options);
}


@NonNull
@Override
public product_selection_ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.product_selection_item, parent, false);
    product_selection_ViewHolder ViewHolder = new product_selection_ViewHolder(v, mListener);
    return ViewHolder;
}

@SuppressLint("SetTextI18n")
@Override
protected void onBindViewHolder(@NonNull product_selection_ViewHolder holder, int position, @NonNull product_selection_Item model) {

    holder.mProductname.setText(model.getmProductname());
    holder.mFat_Value.setText(String.valueOf(model.getmFat_Value() + "% Fett"));
    holder.mPrice.setText(String.valueOf(model.getmPrice().get(0) + " €"));
}

}

你能帮帮我吗？

提前致谢！

Answer 1

我解决了

我需要在我的 Product_Selection_Item - Class “isOffer” 中创建一个新属性 getter “getisOffer”。

之后，我在适配器内部简单地创建了一个新的布尔变量“isOffer”，它获取当前布尔值。就像：

protected void onBindViewHolder(@NonNull product_selection_ViewHolder holder, int position, @NonNull product_selection_Item model) {

    holder.mProductname.setText(model.getmProductname());
    holder.mFat_Value.setText(String.valueOf(model.getmFat_Value() + "% Fett"));
    holder.mPrice.setText(String.valueOf(model.getmPrice().get(0) + " €"));
    holder.isOffer = model.getisOffer();
    if(holder.isOffer){
        holder.mPrice.setTextColor(Color.parseColor("#D90000"));
    }
    else{
        holder.mPrice.setTextColor(Color.parseColor("#000000"));
    }
}

不知道这是否是最佳解决方案，但它对我有用！ :)

编辑：

这只能这样工作，因为我正在使用 FirestoreUI 和 FirestoreRecyclerAdapter。

此处，Firestore 存储中具有相同名称的 Product_Selection_Item 属性的每个 getter 将自动连接到 Firestore。

这就是为什么我可以做到 "holder.isOffer = model.getisOffer();"

Android Studio/Firestore：Firestore Boolean 在 RecyclerView 中的 TextView 的机会颜色？

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