Can't find textview in toolbar include layout android -


i have toolbar has custom textview inside:

<?xml version="1.0" encoding="utf-8"?> <android.support.v7.widget.toolbar xmlns:android="http://schemas.android.com/apk/res/android"     android:id="@+id/toolbar"     android:layout_width="match_parent"     android:background="@drawable/headerbg"     android:theme="@style/customtoolbartheme"     android:layout_height="48dp">      <textview         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="toolbar title"         android:textcolor="@color/white"         android:textsize="18sp"         android:fontfamily="sans-serif-light"         android:layout_gravity="left"         android:id="@+id/tvtoolbartitle" />  </android.support.v7.widget.toolbar>

i use include in layout:

<include         android:id="@+id/app_bar"         layout="@layout/app_bar" />

i reference toolbar , textview set text:

toolbar toolbar = (toolbar) activity.findviewbyid(r.id.toolbar);         logger.d(activity.getclass(), "toolbar: " + toolbar);         textview tvtoolbartitle = (textview) toolbar.findviewbyid(r.id.tvtoolbartitle);         tvtoolbartitle.settext(activity.gettitle());         activity.setsupportactionbar(toolbar);

i keep getting error:

caused by: java.lang.nullpointerexception: attempt invoke virtual method 'android.view.view android.support.v7.widget.toolbar.findviewbyid(int)' on null object reference

if remove id of the include tag, works perfectly.

you overriding id of toolbar in include tag. r.id.toolbar no longer id of included toolbar activity r.id.app_bar instead.

if keep id in include tag use following code access toolbar:

toolbar toolbar = (toolbar) activity.findviewbyid(r.id.app_bar);

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