Cannot link layout with adapter

[Malavika Shanker]

Hi!
I cannot link the card view layout with an adapter even tho I followed the general format of context, layout, and array.
The error is on line 27 a red line under r.layout.item_list_view and it says the required is activity and that I gave it an int.
I have no idea why it thinks I gave it an int..

package com.example.myrecipiebook;

import android.database.Cursor;
import android.os.Bundle;
import android.os.PersistableBundle;
import android.view.View;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.cardview.widget.CardView;
import androidx.recyclerview.widget.RecyclerView;

import java.util.ArrayList;
import java.util.List;

public class Recipelist extends AppCompatActivity {
    RecyclerView recyclerView;
    ArrayList<recipe> list;
    RecipeAdapter adapter;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.recipe_list);
        recyclerView = (RecyclerView) findViewById(R.id.RecyclerView);
        list = new ArrayList<>();
        adapter = new RecipeAdapter(this, R.layout.item_list_view,list);
        recyclerView.setAdapter(adapter);

    }
}

The layout file

<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
app:cardBackgroundColor="@color/white"
app:cardCornerRadius="8dp"
app:cardElevation="8dp"
app:cardMaxElevation="10dp"
app:cardPreventCornerOverlap="true"
app:cardUseCompatPadding="true">


    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

        <ImageView
            android:id="@+id/idCourseImage"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:layout_margin="10dp"
            android:contentDescription="@string/app_name"
            android:padding="5dp"
            android:src="@drawable/wha" />


        <TextView
            android:id="@+id/idCourseName"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginStart="22dp"
            android:layout_marginTop="10dp"
            android:layout_toEndOf="@id/idCourseImage"
            android:text="AAAAAAA"
            android:textColor="@color/black"
            android:textSize="18sp"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/idCourseRating"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@id/idCourseName"
            android:layout_marginStart="10dp"
            android:layout_marginTop="20dp"
            android:layout_toEndOf="@id/idCourseImage"
            android:drawablePadding="2dp"
            android:text="BBBBBBB"
             />

        <TextView
            android:id="@+id/idCourseRating2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"

            android:layout_below="@id/idCourseRating"
            android:layout_alignParentEnd="true"
            android:layout_marginStart="10dp"
            android:layout_marginTop="20dp"

            android:layout_toEndOf="@id/idCourseImage"

            android:text="CCCCCCCCCCC" />
    </RelativeLayout>
</androidx.cardview.widget.CardView>

[Malavika Shanker]

My RecipeAdapter

public class RecipeAdapter extends RecyclerView.Adapter<RecipeAdapter.viewHolder> {

    Context context;
    Activity activity;
    ArrayList<recipe> recipelist;




    public RecipeAdapter(Context context, Activity activity, ArrayList<recipe> recipelist) {
        this.context = context;
        this.activity = activity;
        this.recipelist = recipelist;
    }

[Norm Radder]

why it thinks I gave it an int.

        adapter = new RecipeAdapter(this, R.layout.item_list_view,list);

R is a class created by the IDE as a place to hold the constants it creates.  Here is the path to R.java for one of my projects:
D:\AndroidDevelopment\workspace\DialogFragmentTest\gen\com\example\dialogfragmenttest\R.java
If you look in R.java there will be an inner class nameed layout and inside of that item_list_view will be defined as an int.

A reference for the R.java file: https://www.javatpoint.com/R-java-file-in-android

The RecipeAdapter class's constructor takes a reference to an Activity as its second argument.  Would the class holding the above statement be the desired Activity?  Then this would refer to that Activity.

[Tim Holloway]

Actually, I believe that R is created by the Android build process, so even if you aren't using an IDE it should be constructed.

Also, interestingly, the latest Android Studio doesn't seem to want me to explicitly reference R anymore.