How to access RecyclerView in androidx?

Question

Hi I'm new to Android development and I'm trying out a tutorial on MVVM I found on YouTube. The example project in the video uses AppCompat but I converted mine to androidx because from what I read its the current(?) version to use? Am I mistaken with this thinking?

Anyways Part of the tutorial makes use of a RecyclerView and I can't access it on my activity_main.xml file stating that v7 is an unresolved package. android.support.v7.widget.RecyclerView shows up with v7 onwards as red text. I know I can revert it back to older versions but I guess I am trying to make this work since moving forward its expected to know how to use androidx right?

I don't know how to add the RecyclerView to the project with my current project migrated to androidx.

What I've tried:

• Adding implementation 'com.android.support:recyclerview-v7:28.0.0' based on the docs
• Invalidating cache and restarting

My Dependencies:

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.1.0-alpha04'
    implementation 'androidx.appcompat:appcompat:1.0.0-beta01'
    implementation 'androidx.cardview:cardview:1.0.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.1.0-alpha4'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0-alpha4'

    //RecyclerView
    implementation 'com.android.support:recyclerview-v7:28.0.0'


    // Lifecycle components
    implementation "androidx.lifecycle:lifecycle-extensions:2.1.0-alpha04"
    annotationProcessor "androidx.lifecycle:lifecycle-compiler:2.1.0-alpha04"

    // Room Components
    implementation "androidx.room:room-runtime:2.1.0-alpha06"
    annotationProcessor "androidx.room:room-compiler:2.1.0-alpha06"
}

My activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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">

    <view class="android.support.v7.widget.RecyclerView"
        android:id="@+id/recycler_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:listitem="@layout/todo_item"/>

</androidx.constraintlayout.widget.ConstraintLayout>

Answer 1

RecyclerViewwas migrated to AndroidX as well:

1. Updatebuild.gradle:

implementation 'androidx.recyclerview:recyclerview:1.1.0' 

2. Change layout file:

<androidx.recyclerview.widget.RecyclerView>...</androidx.recyclerview.widget.RecyclerView 

Answer 2

Official document : https://developer.android.com/jetpack/androidx/migrate

Step 1: Check and set the lines in gradle.properties:

android.useAndroidX=true android.enableJetifier=true 

Step 2: Change

implementation 'com.android.support:recyclerview-v7:28.0.0' 

to

implementation 'androidx.recyclerview:recyclerview:1.0.0' //Update to latest version 

And finally: Change the tag

 <view class="android.support.v7.widget.RecyclerView"...> 

to

<androidx.recyclerview.widget.RecyclerView      android:id="@+id/recycler_view"      android:layout_width="match_parent"      android:layout_height="match_parent"      tools:listitem="@layout/todo_item"/> 

Answer 3

you can use the materials design Dependencies

implementation 'com.google.android.material:material:1.2.0-alpha04'
implementation 'com.android.support:multidex:1.0.3'

Answer 4

If you follow the above instructions and the RecyclerView still appears as a grey box in the layout preview, try rebuilding your project.

Answer 5

This issue is solved by adding Dependency to the build.gradle(Module:App):

implementation 'androidx.recyclerview:recyclerview:1.1.0'

and Adding this code to your preferred layout in order to use RecyclerView

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

here is the link to the doc: https://developer.android.com/guide/topics/ui/layout/recyclerview