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

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'
}

Add below dependency in build.gradle;

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

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'
}