如何访问 Adapter 类中另一个布局的 id？

问题描述

我创建了一个具有 Adapter 类的 Recycler 视图，然后我有另一个布局名称 cart 。我想访问适配器类中购物车中存在的文本视图我在 viewHolder 类中使用 LayoutInflater 来访问 cart.xml 中存在的 Textview 但它什么都不做请帮忙！

itemDetailsAdapter java



package com.example.wedeliver;

import android.content.Context;
import android.graphics.Paint;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.constraintlayout.widget.ConstraintLayout;
import androidx.recyclerview.widget.RecyclerView;

import com.bumptech.glide.Glide;
import com.google.android.material.snackbar.Snackbar;
import com.google.firebase.database.ChildEventListener;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;
import com.squareup.picasso.Picasso;

import java.util.ArrayList;

public class itemDetailsAdapter extends RecyclerView.Adapter<itemDetailsAdapter.Viewholder>
{

    public Context context;
    public ArrayList<itemDetails> courseModelArrayList;
    long maxitems=0;
    long booked_items_count=0;
    View view1;

    // Constructor
    public itemDetailsAdapter(Context context,ArrayList<itemDetails> courseModelArrayList) {
        this.context = context;
        this.courseModelArrayList = courseModelArrayList;
    }

    @NonNull
    @Override
    public itemDetailsAdapter.Viewholder onCreateViewHolder(@NonNull ViewGroup parent,int viewType) {
        // to inflate the layout for each item of recycler view.
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_display_card,parent,false);
        View view1 = LayoutInflater.from(parent.getContext()).inflate(R.layout.cart,false);

        return new Viewholder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull itemDetailsAdapter.Viewholder holder,int position) {
        // to set data to textview and imageview of each card layout
        itemDetails itemDetails = courseModelArrayList.get(position);
        //Context context = holder.product_image.getContext();
        Glide.with(context).load(itemDetails.getimageView()).into(holder.product_image);
       holder.discount.setText(itemDetails.getdiscount()+"% OFF");
        holder.actual_price.setText(itemDetails.getActual_price());
        holder.actual_price.setPaintFlags(holder.actual_price.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
        holder.selling_price.setText("₹ /-"+itemDetails.getSelling_price());
        holder.product_name.setText(itemDetails.getProduct_name());
        holder.product_brand.setText(itemDetails.getProduct_brand());
        maxitems=Long.parseLong(itemDetails.getCapacity().toString());
        booked_items_count=Long.parseLong(itemDetails.getBooked_items_count().toString());
        holder.add.setonClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(booked_items_count<maxitems) {

                   booked_items_count++;
                    holder.counter.setText(""+booked_items_count);
                    notifyDataSetChanged();

                    //databaseReference1.child("booked_items_count").setValue(""+booked_items_count);
                   // Log.d("hello",""+booked_items_count);
                }
                else
                {
                    Snackbar.make(view,"Out of stock",Snackbar.LENGTH_SHORT).show();
                }
            }
        });
        //Toast.makeText(context,"hello",Toast.LENGTH_SHORT).show();
       // DatabaseReference databaseReference1=FirebaseDatabase.getInstance().getReference("Items").child("Item_"+itemDetails.getProduct_name());
       // itemDetails.setBooked_items_count(""+booked_items_count);
       // databaseReference1.setValue(itemDetails);

    }


    @Override
    public int getItemCount() {
        return courseModelArrayList.size();
    }

    public class Viewholder extends RecyclerView.ViewHolder {
        public ImageView product_image;
        public TextView product_name,product_brand,selling_price,actual_price,discount;
        public TextView add,counter;


        public Viewholder(@NonNull View itemView) {
            super(itemView);
           product_image=itemView.findViewById(R.id.product_img);
           product_name=itemView.findViewById(R.id.product_name);
            product_brand=itemView.findViewById(R.id.brand_name);
            selling_price=itemView.findViewById(R.id.selling_price);
            actual_price=itemView.findViewById(R.id.product_price);
            add=itemView.findViewById(R.id.product_add);
            //here Iam inflating the cart layout and accessing the noficationnumber1 id preset in cart
           View view=LayoutInflater.from(context).inflate(R.layout.cart,null);
           counter=view.findViewById(R.id.notificationNumber1) ;

            discount=itemView.findViewById(R.id.discount);
        }
    }
}

cart.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    xmlns:tools="http://schemas.android.com/tools">
    <ImageView
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:id="@+id/notificationIcon"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:src="@drawable/cart"/>
    <androidx.cardview.widget.CardView
        android:layout_width="18dp"
        android:layout_height="18dp"
        app:cardBackgroundColor="@color/accent"
        app:layout_constraintEnd_toEndOf="@+id/notificationIcon"
        app:layout_constraintTop_toTopOf="@+id/notificationIcon"
        app:cardCornerRadius="50dp">
        <androidx.constraintlayout.widget.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <TextView
                android:id="@+id/notificationNumber1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="1"
                android:textColor="@color/white"
                android:textSize="12sp"
                android:textStyle="bold"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="0.545"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent"></TextView>
        </androidx.constraintlayout.widget.ConstraintLayout>
    </androidx.cardview.widget.CardView>

</androidx.constraintlayout.widget.ConstraintLayout>

解决方法

错误的方式，您返回了ViewHolder(view)，但是view1 没有绑定，您应该使用具有多个viewType 的适配器。检查这个：https://developer.android.com/reference/android/support/v7/widget/RecyclerView.Adapter.html#getItemViewType(int)

首先，您应该将cart.xml 移动到包含recyclerview 的活动中。然后在 recyclerview 适配器中创建一个 onClick 侦听器接口，并在包含 cart.xml 的活动中实现它。现在，您可以通过包含 cart.xml 的活动中的接口更改计数器值。

1) 您应该在您的适配器类中全局初始化 TextView。

TextView textView;

2) 使用 LayoutInflater 在 onCreateViewHolder() 中设置您的 cart.xml 布局并分配您的 textview Id .

 // set the custom layout
    LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    final View customLayout
            = inflater.inflate(
                    R.layout.help_support_dialog_design,null);
    textView = customLayout.findViewById(R.id.txtview);

现在，您可以使用此 Textview 执行任何操作。

android android android-adapter android-layout android-recyclerview java java

如何访问 Adapter 类中另一个布局的 id？

问题描述

解决方法

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