لیست کردن تعدادی آیتم در RecyclerView

kamran_14 · مهر 98

سلام

من کدها رو نوشتم ولی با این خطا مواجه میشوم.

ایراد کدهای من چی میتونه باشه


E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.shop, PID: 3607
    android.view.InflateException: Binary XML file line #24: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
    Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:761)
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:727)
        at android.view.LayoutInflater.rInflate(LayoutInflater.java:858)
        at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821)
        at android.view.LayoutInflater.rInflate(LayoutInflater.java:861)
        at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:518)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:426)
        at com.example.shop.Adapter.ProductAdapter.onCreateViewHolder(ProductAdapter.java:35)
        at com.example.shop.Adapter.ProductAdapter.onCreateViewHolder(ProductAdapter.java:19)
        at androidx.recyclerview.widget.RecyclerView$Adapter.createViewHolder(RecyclerView.java:6794)
        at androidx.recyclerview.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:5975)
        at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5858)
        at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5854)
        at androidx.recyclerview.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2230)
        at androidx.recyclerview.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1557)
        at androidx.recyclerview.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1517)
        at androidx.recyclerview.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:612)
        at androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3924)
        at androidx.recyclerview.widget.RecyclerView.dispatchLayout(RecyclerView.java:3641)
        at androidx.recyclerview.widget.RecyclerView.onLayout(RecyclerView.java:4194)
        at android.view.View.layout(View.java:17637)
        at android.view.ViewGroup.layout(ViewGroup.java:5575)
        at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1079)
        at android.view.View.layout(View.java:17637)
        at android.view.ViewGroup.layout(ViewGroup.java:5575)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
        at android.view.View.layout(View.java:17637)
        at android.view.ViewGroup.layout(ViewGroup.java:5575)
        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
        at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
        at android.view.View.layout(View.java:17637)
        at android.view.ViewGroup.layout(ViewGroup.java:5575)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
        at android.view.View.layout(View.java:17637)
        at android.view.ViewGroup.layout(ViewGroup.java:5575)
        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
        at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
        at android.view.View.layout(View.java:17637)
        at android.view.ViewGroup.layout(ViewGroup.java:5575)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
        at com.android.internal.policy.DecorView.onLayout(DecorView.java:726)
        at android.view.View.layout(View.java:17637)
        at android.view.ViewGroup.layout(ViewGroup.java:5575)
        at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2346)
        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2068)
        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1254)
        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6337)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:874)
        at android.view.Choreographer.doCallbacks(Choreographer.java:686)
        at android.view.Choreographer.doFrame(Choreographer.java:621)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:860)
        at android.os.Handler.handleCallback(Handler.java:751)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:154)
        at android.app.ActivityThread.main(ActivityThread.java:6119)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Application terminated.

من در productActivity اینارو نوشتم:

package com.example.shop.Adapter;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.example.shop.Models.Products;
import com.example.shop.R;
import java.util.ArrayList;
import java.util.List;

public class ProductAdapter extends RecyclerView.Adapter<ProductAdapter.ProductViewHolder>{
    private List<Products> products=new ArrayList<Products> (  );
    private Context context;

    public ProductAdapter(List<Products> products, Context context) {
        this.products = products;
        this.context = context;
    }


    @NonNull
    @Override
    public ProductViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view=LayoutInflater.from ( parent.getContext () ).inflate ( R.layout.products_list_row,parent,false);//inflater.inflate (R.layout.products_list_row,parent);
        return new ProductViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ProductViewHolder holder, int position) {
        Products oP=products.get ( position );
        holder.txt_priceProduct.setText ( oP.getPriceProduct () );
        holder.txt_nameProduct.setText (oP.getNameProduct () );
        holder.img_imgProduct.setImageDrawable (oP.getImg_product () );
    }

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

    public class ProductViewHolder extends RecyclerView.ViewHolder {
        public ImageView img_imgProduct;
        public TextView txt_nameProduct;
        public TextView txt_priceProduct;
        public ProductViewHolder(@NonNull View itemView) {
            super ( itemView );
            img_imgProduct=itemView.findViewById ( R.id.imgProduct );
            txt_nameProduct=itemView.findViewById ( R.id.nameProduct );
            txt_priceProduct=itemView.findViewById ( R.id.priceProduct );
        }

    }
}

و در productModel این کدهارو:

package com.example.shop.Models;

import android.graphics.drawable.Drawable;

public class Products {
    private Drawable img_product;
    private String nameProduct;
    private String priceProduct;

    public Products(Drawable img_product, String nameProduct, String priceProduct) {
        this.img_product = img_product;
        this.nameProduct = nameProduct;
        this.priceProduct = priceProduct;
    }

    public Drawable getImg_product() {
        return img_product;
    }

    public void setImg_product(Drawable img_product) {
        this.img_product = img_product;
    }

    public String getNameProduct() {
        return nameProduct;
    }

    public void setNameProduct(String nameProduct) {
        this.nameProduct = nameProduct;
    }

    public String getPriceProduct() {
        return priceProduct;
    }

    public void setPriceProduct(String priceProduct) {
        this.priceProduct = priceProduct;
    }
}

و در productAdapter این کدها رو:

package com.example.shop.Adapter;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.example.shop.Models.Products;
import com.example.shop.R;
import java.util.ArrayList;
import java.util.List;

public class ProductAdapter extends RecyclerView.Adapter<ProductAdapter.ProductViewHolder>{
    private List<Products> products=new ArrayList<Products> (  );
    private Context context;

    public ProductAdapter(List<Products> products, Context context) {
        this.products = products;
        this.context = context;
    }


    @NonNull
    @Override
    public ProductViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view=LayoutInflater.from ( parent.getContext () ).inflate ( R.layout.products_list_row,parent,false);//inflater.inflate (R.layout.products_list_row,parent);
        return new ProductViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ProductViewHolder holder, int position) {
        Products oP=products.get ( position );
        holder.txt_priceProduct.setText ( oP.getPriceProduct () );
        holder.txt_nameProduct.setText (oP.getNameProduct () );
        holder.img_imgProduct.setImageDrawable (oP.getImg_product () );
    }

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

    public class ProductViewHolder extends RecyclerView.ViewHolder {
        public ImageView img_imgProduct;
        public TextView txt_nameProduct;
        public TextView txt_priceProduct;
        public ProductViewHolder(@NonNull View itemView) {
            super ( itemView );
            img_imgProduct=itemView.findViewById ( R.id.imgProduct );
            txt_nameProduct=itemView.findViewById ( R.id.nameProduct );
            txt_priceProduct=itemView.findViewById ( R.id.priceProduct );
        }

    }
}

یک روزه که کلا من روی پیدا کردن خطا گذاشتم اما پیدا نکردم. لطفا کمکم کنید

ورود

لیست کردن تعدادی آیتم در RecyclerView

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kamran_14 0

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