java - FacbookActivity in Fragment convert -


i have facebookactivity , have convert activity fragment.

my fragment:

public class fragment3 extends fragment{      view contentview3;       @nullable     @override     public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {          facebooksdk.sdkinitialize(getapplicationcontext());         appeventslogger.activateapp(getactivity());          contentview3 = inflater.inflate(r.layout.activity_login, null);           return contentview3;     }      @override     public void onviewcreated(view view, @nullable bundle savedinstancestate) {          button btn = (button)contentview3.findviewbyid(r.id.fbbutton);         btn.setonclicklistener(new view.onclicklistener() {             @override             public void onclick(view v) {                 intent fb = new intent (getactivity().getapplicationcontext(), login.class);                 startactivity(fb);             }         });           super.onviewcreated(view, savedinstancestate);     } }

when run fragment app unfortunately closed.

my activity_login:

<framelayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/container"     android:layout_width="match_parent"     android:layout_height="match_parent"     tools:context=".fragment3">    </framelayout>


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