CODEWITHSUNDEEP
androidandroid-recyclerviewandroid-studio-4.2
TecBrat
TecBrat

Reputation: 3729

Attempting to handle RecyclerView and get "Cannot resolve symbol 'NotNull'" creating ViewHolder

Using Android Studio 4.2.1 and trying to handle a RecyclerView I get an error when trying to build my own ViewAdapter.

I've added implementation 'androidx.recyclerview:recyclerview:1.2.1' to my build.gradle :app file.

My activity_main file is like this:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:padding="10dp">

    <androidx.recyclerview.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/contactsRV"/>

</RelativeLayout>

I've created another layout file like this:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="10dp"
    android:id="@+id/parent">


    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Contact Name"
        android:id="@+id/txtName"/>

</RelativeLayout>

I've created a Java class like this

package com.domain.packagename;

import android.view.View;

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

public class ContactRVAdapter {
    public class ViewHolder extends RecyclerView.ViewHolder{
        public ViewHolder(@NonNull @org.jetbrains.annotations.NotNull View itemView) {
            super(itemView);
        }
    }
}

The NotNull is Red and the "Problems" pane says "Cannot resolve symbol 'NotNull'". The public ViewHolder()... was auto-generated.

What, if anything, am I doing wrong? (This is not exactly homework. I'm not in an organized class. I am following on online tutorial that's about a year old and the instructor's AS is a slightly older version than mine.)

Upvotes: 1

Views: 875

Answers (1)

Zain
Zain

Reputation: 40878

You can discard it by removing the @org.jetbrains.annotations.NotNull annotation:

public ViewHolder(@NonNull View itemView) {

Or if you wish to leave it you need to include its dependency in build.gradle (Module level):

implementation 'org.jetbrains:annotations:16.0.2'

Upvotes: 1

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