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I'm following my teachers tutorial and therefore writing exactly the same code that he has in his example. So I just created a new class to learn RecyclerView but I can't import RecyclerView On mouse-over, it just says " Cannot resolve symbol RecyclerView ". I use Android Studio 2.3.3. Am I missing something obvious?

import android.support.v7.widget.RecyclerView;
public class CustomAdapter extends RecyclerView.Adapter<ComposedAdapter.Holder> {
//stuff 
Gradle: 
apply plugin: 'com.android.application'android {
compileSdkVersion 25
buildToolsVersion "25.0.2"
defaultConfig {
    applicationId "sofialarsson.customrecyclerview"
    minSdkVersion 19
    targetSdkVersion 25
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
dependencies {
 compile fileTree(dir: 'libs', include: ['*.jar'])
 androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
    exclude group: 'com.android.support', module: 'support-annotations'
compile 'com.android.support:appcompat-v7:25.3.1'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
testCompile 'junit:junit:4.12'
apply plugin: 'com.android.application'android {
compileSdkVersion 25
buildToolsVersion "25.0.2"
defaultConfig {
    applicationId "sofialarsson.customrecyclerview"
    minSdkVersion 19
    targetSdkVersion 25
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
dependencies {
 compile fileTree(dir: 'libs', include: ['*.jar'])
 androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
    exclude group: 'com.android.support', module: 'support-annotations'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
compile "com.android.support:appcompat-v7:25.0.0"
compile "com.android.support:recyclerview-v7:25.0.0"
testCompile 'junit:junit:4.12'
If you are using androidx artifacts, add the following to your app level build.gradle
dependencies {
    implementation 'androidx.recyclerview:recyclerview:1.1.0'
    implementation 'androidx.appcompat:appcompat:1.1.0'
Might be useful, so Let me drop this for those who might want to migrate to androidx. In your build.gradle (Module app) add the dependency like this, instead of:
compile 'com.android.support:recyclerview-v7:23.3.0'
implementation 'androidx.recyclerview:recyclerview:1.1.0'
Then import like this, instead of:
import android.support.v7.widget.RecyclerView;
import androidx.recyclerview.widget.RecyclerView;
Sync and enjoy!
Just add these two dependencies and you are good to go.
compile 'com.android.support:design:25.3.1'
compile 'com.android.support:recyclerview-v7:25.3.1'
Make sure always always use same versions everywhere like you use here 25.3.1.
Also update your buildToolsVersion="25.0.0"  .
Thanks!!!
Just add compile 'com.android.support:recyclerview-v7:25.3.1' dependencies in  build.gradle app file like below code
dependencies {
    compile 'com.android.support:appcompat-v7:25.3.1'
    compile 'com.android.support:recyclerview-v7:25.3.1'
to give you an up-to-date and comprehensive answer, you have two choices.
Pre Android 9.0 (pre API 28), you have to use the old Support Library:
dependencies {
    compile "com.android.support:appcompat-v7:25.0.0"
    compile "com.android.support:recyclerview-v7:25.0.0"
For these dependencies, you have to use the version number of your Build Tools Version.
In Android 9.0 (API 28+) and above, you have to use the new Support Library (Noted here https://developer.android.com/topic/libraries/support-library/features#v7):
dependencies {
    implementation "androidx.appcompat:appcompat:1.1.0"
    implementation "androidx.recyclerview:recyclerview:1.1.0"
For these dependencies, you have to use the version numbers from the following pages:
https://developer.android.com/jetpack/androidx/releases/appcompat
https://developer.android.com/jetpack/androidx/releases/recyclerview
Add this class in the main_activity.xml file:
class="androidx.recyclerview.widget.RecyclerView"/> 
Refer to https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView
for more info...
        
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