Can't Find Toolbar in an Included Layout

Can't find Toolbar in an included layout

You are overriding the id of toolbar in the include tag. So the R.id.toolbar is no longer id of your included toolbar for your activity but now it is R.id.app_bar instead.

If you keep the id in include tag then use following code to access your toolbar:

Toolbar toolbar = (Toolbar) activity.findViewById(R.id.app_bar);

Android toolbar menu is not showing

I'm not sure why, but when i place everything related menu inflating in onPrepareOptionsMenu method, everything works fine.

@Override
public boolean onPrepareOptionsMenu(final Menu menu) {
    getMenuInflater().inflate(R.menu.dashboard, menu);

    return super.onCreateOptionsMenu(menu);
}

can't find textView id inside toolbar

You are giving two different id to toolbar layout

 android:id="@+id/my_toolbar"

and in main layout while including you are giving

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

make these ids same

Missing toolbar in Android Studio?

The toolbar that is missing is associated with a constraint based layout, and it missing because the layout for your new view does not have a constraint based layout.

You can right click the view and click Convert to ConstraintBasedLayout in the dropdown menu to restore that bar.

AppBarLayout is not on the top of the screen

In res/values/styles set your style to NoActionBar theme, like:

<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">

Now, you should lose your regular ActionBar and you can work with your toolbar.

EDIT: What OP tried to acomplish was position included layout below AppBar layout in CoordinatorLayout. That's accomplished by adding app:layout_behavior="@string/appbar_scrolling_view_behavior" to include layout.

collapsing toolbar layout won't collapse

Please try this. It will work.

<?xml version="1.0" encoding="utf-8"?>
    <android.support.design.widget.CoordinatorLayout 
        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:layout_height="match_parent"
        android:background="@color/colorWhite"
        tools:context=".Controllers.MainActivity">

        <android.support.design.widget.AppBarLayout
            android:id="@+id/AppBarLayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

            <android.support.design.widget.CollapsingToolbarLayout
                android:layout_width="match_parent"
                android:layout_height="150dp"
                android:textAlignment="center"
                app:contentScrim="@color/colorPrimary"
                app:layout_scrollFlags="scroll|exitUntilCollapsed"
                app:title="Hero Title">

                <ImageView
                    android:layout_width="match_parent"
                    android:layout_height="150dp"
                    android:background="#000000"
                    app:layout_collapseMode="parallax"
                    app:layout_collapseParallaxMultiplier="0.7" />

                <android.support.v7.widget.Toolbar
                    android:layout_width="match_parent"
                    android:layout_height="?attr/actionBarSize"
                    app:layout_collapseMode="pin"
                    app:popupTheme="@style/ThemeOverlay.AppCompat.Dark">

                </android.support.v7.widget.Toolbar>

            </android.support.design.widget.CollapsingToolbarLayout>

        </android.support.design.widget.AppBarLayout>

        <FrameLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_behavior="@string/appbar_scrolling_view_behavior">

            <android.support.v7.widget.RecyclerView
                android:id="@+id/herosRecyclerView"
                android:layout_width="match_parent"
                android:layout_height="match_parent" />
        </FrameLayout>

    </android.support.design.widget.CoordinatorLayout>

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