Can't import: android.support.v7.widget.RecyclerView in Android Studio

Question

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'
}

Answer 1

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'

to

implementation 'androidx.recyclerview:recyclerview:1.1.0'

Then import like this, instead of:

import android.support.v7.widget.RecyclerView;

use:

import androidx.recyclerview.widget.RecyclerView;

Sync and enjoy!

Answer 2

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'
}

Answer 3

You need to add dependencies in build.gradle

Use this update gradle file

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'
}

Answer 4

Add below dependency in build.gradle;

compile 'com.android.support:design:xx.x.x'