android - Bottom navigation view how to add bottombar to all layouts? -


i need bottom bar in every layouts, did code, error comes in setcontentview in bottom bar java file.

import android.content.intent; import android.support.annotation.layoutres; import android.support.annotation.nonnull; import android.support.design.widget.bottomnavigationview; import android.support.v7.app.appcompatactivity; import android.support.v7.app.appcompatactivity; import android.view.menuitem; import android.widget.framelayout;  public class bottom_bar extends appcompatactivity implements bottomnavigationview.onnavigationitemselectedlistener {     bottomnavigationview btview;      @override     public void setcontentview(@layoutres int layoutresid) {         super.setcontentview(layoutresid);         coordinatorlayout colayout = (coordinatorlayout)getlayoutinflater().inflate(r.layout.bottombar,null);         framelayout layout = (framelayout) colayout.findviewbyid(r.id.frame);         getlayoutinflater().inflate(layoutresid,layout,true);         super.setcontentview(colayout);         btview = (bottomnavigationview) findviewbyid(r.id.bottombar);     }      @override     public boolean onnavigationitemselected(@nonnull menuitem item) {         switch (item.getitemid())             case r.id.profile:                 break;              case  r.id.homemain:                 intent = new intent(this,home.class);                 startactivity(i);                 break;         }         return false;     } }

this bottombar.xml file. error like:

at com.example.android_heptshive.sam_school.bottom_bar.setcontentview(bottom_bar.java:24)  @ com.example.android_heptshive.sam_school.home.oncreate(home.java:20)   <android.support.design.widget.coordinatorlayout   xmlns:android="http://schemas.android.com/apk/res/android"   android:layout_width="match_parent"   android:layout_height="match_parent"   android:id="@+id/codination"   xmlns:app="http://schemas.android.com/apk/res-auto">     <android.support.design.widget.bottomnavigationview       android:id="@+id/bottombar"       android:layout_width="match_parent"       android:layout_height="wrap_content"       android:layout_gravity="bottom"       app:menu="@menu/bottom_menu"       android:background="@color/back"       app:itemicontint="#ffffff">     </android.support.design.widget.bottomnavigationview>     <framelayout       android:id="@+id/frame"       android:layout_width="match_parent"       android:layout_height="wrap_content"       android:layout_gravity="bottom"       android:layout_marginbottom="55dp"/>     </android.support.design.widget.coordinatorlayout>


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