android - How to implement OnScrollistener in a fragment -

i can't seem implement/extend onscrollistener recyclerview know when recyclerview hits bottom

public class upcomingfragment extends fragment  

how implement if:

implements recyclerview.onscrolllistener 

and

implements onscrolllistener 

give me "interface expected here" error

my build gradle module:

android { compilesdkversion 21 buildtoolsversion "21.1.2"  defaultconfig {     applicationid "company.com.movieapp"     minsdkversion 15     targetsdkversion 21     versioncode 1     versionname "1.0" } buildtypes {     release {         minifyenabled false         proguardfiles getdefaultproguardfile('proguard-android.txt'), 'proguard-rules.pro'     }  } } 

build grade project

buildscript { repositories {     jcenter() } dependencies {     classpath 'com.android.tools.build:gradle:1.2.3'      // note: not place application dependencies here; belong     // in individual module build.gradle files } 

}

based on docs:

https://developer.android.com/reference/android/support/v7/widget/recyclerview.onscrolllistener.html

recyclerview.onscrolllistener abstract.

use listener this:

private final recyclerview.onscrolllistener onscrolllistener = new recyclerview.onscrolllistener() {     @override     public void onscrollstatechanged(final recyclerview recyclerview, final int newstate) {         // code     }      @override     public void onscrolled(final recyclerview recyclerview, final int dx, final int dy) {         // code     } }; 

add recyclerview:

recyclerview.addonscrolllistener(onscrolllistener);