java - android findViewById is null in LinearLayout -


android findviewbyid method return value null

this view custom class

view.xml

<include         android:id="@+id/view_before_login"         layout="@layout/view_mypage_before_login"         android:layout_width="match_parent"         android:layout_height="wrap_content"/>

view activity java (fragment)

@override     public view oncreateview(layoutinflater inflater, viewgroup container,                              bundle savedinstancestate) {         final viewgroup rootview = (viewgroup) inflater.inflate(r.layout.view, container, false);          mbefore = (memberbeforeloginview)rootview.findviewbyid(r.id.view_before_login);         mafter = (memberafterloginview)rootview.findviewbyid(r.id.view_after_login);          mbefore.setstatelistener(this);         mafter.setstatelistener(this);          route();          return rootview;     }

inside xml view_mypage_before_login.xml

<?xml version="1.0" encoding="utf-8"?> <com.main.view.memberafterloginview     xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     android:orientation="vertical" android:layout_width="match_parent"     android:layout_height="match_parent">     <imagebutton         android:id="@+id/profile"         android:layout_width="137dp"         android:layout_height="121dp"         app:srccompat="@drawable/empty" />      <button         android:id="@+id/logout"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:text="logout" /> </com.main.view.memberafterloginview>

com.main.view.memberafterloginview.java

public class memberafterloginview extends linearlayout implements view.onclicklistener, memberviewlistener.memberchildviewinterface {     private memberviewlistener mmemberlistener = null;      private button mbtnlogout = null;      public memberafterloginview(context context) {         super(context);         initialize(context);     }      public memberafterloginview(context context, @nullable attributeset attrs) {         super(context, attrs);         initialize(context);     }      public memberafterloginview(context context, @nullable attributeset attrs, int defstyleattr) {         super(context, attrs, defstyleattr);         initialize(context);     }      private void initialize(context context) {         /*layoutinflater inflater = (layoutinflater) context                 .getsystemservice(context.layout_inflater_service);         view v = inflater.inflate(r.layout.view_mypage_after_login, null);         */          mbtnlogout = (button) findviewbyid(r.id.logout);     } ...

why null variable mbtnlogout ? (initialize function inside variable)

i immature in english. sorry.

private view initialize(context context) {     layoutinflater inflater = (layoutinflater) context             .getsystemservice(context.layout_inflater_service);     view v = inflater.inflate(r.layout.view_mypage_after_login, null);      mbtnlogout = (button) v.findviewbyid(r.id.logout);     return v; }

the button part of new inflated view. since inflate result not applied activity yet activity.findviewbyid cannot find it.


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