android - Snackbar is not working within fragment class -

i trying show snackbar view when click on button shows force close error when click on button

i have define fragment class below , error log.

i have fragment class:

public class homefragment extends fragment {      @override     public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {         view rootview = inflater.inflate(r.layout.fragment_home, container, false);         context = getactivity();         initui(rootview);         return rootview;     }      private void initui(view view) {          btn= (button) view.findviewbyid(r.id.btnpress);         btn.setonclicklistener(new view.onclicklistener() {             @override             public void onclick(view v) {                 snackbar.make(getview(),"snackbar test" , snackbar.length_long).show();             }         });     } 

fragment_home.xml:

<relativelayout 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:id="@+id/mainrl"     android:layout_height="match_parent">      <linearlayout         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_alignparentbottom="true"         android:layout_centerhorizontal="true"         android:orientation="horizontal"         android:paddingbottom="40dp" >              <button             android:id="@+id/btn"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="please press" />      </linearlayout>  </relativelayout> 

when press on button not showing snackbar. gives below error log:

java.lang.noclassdeffounderror: android.support.design.widget.coordinatorlayout             @ android.support.design.widget.snackbar.findsuitableparent(snackbar.java:237)             @ android.support.design.widget.snackbar.make(snackbar.java:206)             @ com.example.test.fragment.homefragment$3.onleftcardexit(homefragment.java:168)             @ android.view.viewpropertyanimator$animatoreventlistener.onanimationend(viewpropertyanimator.java:1030)             @ android.animation.valueanimator.endanimation(valueanimator.java:1056)             @ android.animation.valueanimator.access$400(valueanimator.java:50)             @ android.animation.valueanimator$animationhandler.doanimationframe(valueanimator.java:644)             @ android.animation.valueanimator$animationhandler.run(valueanimator.java:660)             @ android.view.choreographer$callbackrecord.run(choreographer.java:788)             @ android.view.choreographer.docallbacks(choreographer.java:591)             @ android.view.choreographer.doframe(choreographer.java:559)             @ android.view.choreographer$framedisplayeventreceiver.run(choreographer.java:774)             @ android.os.handler.handlecallback(handler.java:808)             @ android.os.handler.dispatchmessage(handler.java:103)             @ android.os.looper.loop(looper.java:193)             @ android.app.activitythread.main(activitythread.java:5333)             @ java.lang.reflect.method.invokenative(native method)             @ java.lang.reflect.method.invoke(method.java:515)             @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:824)             @ com.android.internal.os.zygoteinit.main(zygoteinit.java:640)             @ dalvik.system.nativestart.main(native method) 

how can solved error?

i have solved this:

it fine if not include coordinatedlayout fragment_home.xml

solution:

defined : private relativelayout mroot;

now initialize in initui(view view)

mroot = (relativelayout) view.findviewbyid(r.id.mainrl); 

and on button click event put following code:

 snackbar.make(mroot, "had snack @ snackbar", snackbar.length_long).show(); 

now main thing is:

just change current theme theme.appcompat.light.noactionbar

it done.!!!