Develop Reference

How to set toolbar title when a text view hide from screen?

How to implement that action which is shown in image
https://i.stack.imgur.com/MluU2.jpg

Use this piece of code to hide your layout
<?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"
android:id="#+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light" />
</android.support.design.widget.AppBarLayout>
<!-- Your Remaining Code -->
</android.support.design.widget.CoordinatorLayout>

Try using a collapsingToolbar layout. The material design example is found here but of significance is the below snippet
<com.google.android.material.appbar.CollapsingToolbarLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleGravity="top"
app:expandedTitleMarginStart="#dimen/shrine_toolbar_offset_start"
app:expandedTitleMarginTop="#dimen/shrine_toolbar_offset_top"
app:layout_scrollFlags="scroll|exitUntilCollapsed|snap">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="#dimen/shrine_toolbar_image_offset_top"
app:layout_collapseMode="parallax"
app:layout_collapseParallaxMultiplier="0.5"/>
<android.support.v7.widget.Toolbar
android:id="#+id/AppBar"
android:layout_width="match_parent"
android:layout_height="#dimen/shrine_toolbar_collapsed_height"
app:layout_collapseMode="pin"/>
</com.google.android.material.appbar.CollapsingToolbarLayout>

Changing the background of a Collapsing Toolbar

I have a Collapsing toolbar in my ProfileFragment.java.
I want to change it's background using Glide, so the user can change it the way they like it. Like they would change a normal banner picture. Can I do that?
Here is my XML:
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent" android:layout_height="match_parent"
android:background="#color/colorWhite"
android:orientation="vertical"
xmlns:tools="http://schemas.android.com/tools"
>
<android.support.design.widget.AppBarLayout
android:id="#+id/testeparabackground"
android:layout_width="match_parent"
android:layout_height="203dp">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/backgroundcollapsedtoolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginEnd="64dp"
app:expandedTitleMarginStart="48dp"
app:layout_scrollFlags="exitUntilCollapsed|scroll"
android:background="#drawable/banner_profile"
app:title="Feel">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbarid"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
</android.support.design.widget.CoordinatorLayout>
EDIT
I don't know if I was clear enough so, here is an edit. I want that big grey block to change it's background image when the user loads an image from their gallery. I already know how to get the image from gallery, I just don't know how to load it into the collapsing toolbar

If I understand what you want correctly, then you should add the image into the CollapsingToolbarLayout with whatever collapsemode creates the effect you want. So it would look like:
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent" android:layout_height="match_parent"
android:background="#color/colorWhite"
android:orientation="vertical"
xmlns:tools="http://schemas.android.com/tools">
<android.support.design.widget.AppBarLayout
android:id="#+id/testeparabackground"
android:layout_width="match_parent"
android:layout_height="203dp">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/backgroundcollapsedtoolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginEnd="64dp"
app:expandedTitleMarginStart="48dp"
app:layout_scrollFlags="exitUntilCollapsed|scroll"
android:background="#drawable/banner_profile"
app:title="Feel">
<ImageView
android:id="#+id/toolbarimage"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitSystemWindows="true"
android:scaleType="centerCrop"
app:layout_collapseMode="parallax" />
<android.support.v7.widget.Toolbar
android:id="#+id/toolbarid"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
</android.support.design.widget.CoordinatorLayout>

AppBarLayout change offset programmatically

How can I change the offset of the AppBarLayout programmatically?
I want a certain offset to the AppBarLayout(partially expanded) when the Activity first loads, then the user could expand it more or collapse it. The current behaviour is that it's fully expanded when the Activity first loads.
my.xml
<android.support.design.widget.AppBarLayout
android:id="#+id/app_bar_layout"
android:layout_width="match_parent"
android:layout_height="300dp"
android:fitsSystemWindows="true"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/collapsing_toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clickable="true"
android:fitsSystemWindows="true"
app:expandedTitleMarginEnd="64dp"
app:expandedTitleMarginStart="48dp"
app:layout_collapseParallaxMultiplier="0.7"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_collapseMode="parallax">
<ImageView
android:id="#+id/image"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"
android:src="#drawable/pic"/>
<View
android:id="#+id/overlay"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/overlay"
app:layout_collapseMode="pin"/>
</FrameLayout>
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
app:title="#string/app_name"/>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
Need to support API 16+
Thanks!

Use this: ScrollableAppBar
You just have to replace your AppBarLayout with:
<it.michelelacorte.scrollableappbar.ScrollableAppBar
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="380dp"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
android:fitsSystemWindows="true">
</it.michelelacorte.scrollableappbar.ScrollableAppBar>
and than:
ScrollableAppBar appBarLayout = (ScrollableAppBar) findViewById(R.id.appbar);
//To give the effect "in the middle" of the image (like gif)
appBarLayout.collapseToolbar();
Output:

Top of content in CollapsingToolbarLayout obscured by Toolbar background colour

I'm seeing an issue with my app when using the Android design support library in that the CollapsingToolbarLayout appears to have a theme-coloured background bar at the top, even when there is enough space (and therefore it should be 'transparent').
Any ideas what I'm doing wrong?
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto" android:id="#+id/main_content"
android:layout_width="match_parent" android:layout_height="match_parent"
android:fitsSystemWindows="true" tools:context=".MainActivity">
<android.support.design.widget.AppBarLayout android:id="#+id/appbar"
android:layout_width="match_parent" android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay"
android:fitsSystemWindows="true">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/collapsing_toolbar"
android:layout_width="match_parent"
android:layout_height="400dp"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginEnd="64dp"
app:expandedTitleMarginStart="48dp"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"
android:fitsSystemWindows="true"
app:layout_collapseMode="parallax">
<fragment
android:layout_width="match_parent"
android:layout_height="match_parent" android:id="#+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
/>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#66000000"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
</RelativeLayout>
<android.support.v7.widget.Toolbar android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="#style/AppTheme.PopupOverlay"
app:layout_collapseMode="pin">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<!-- content -->
</android.support.v4.widget.NestedScrollView>
</android.support.design.widget.CoordinatorLayout>

I'm having very similar layout in my app and it's working well for me. Comparing mine layout to yours, my guess is you should remove background attribute from your Toolbar. Furthermore, I use one of the default themes for Toolbar (#style/ThemeOverlay.AppCompat.Dark). I see you're using your own theme, which might be causing problem as well. (I set StatusBar color to transparent in Java code, if you're interested in that too).

Image ignores scaleType when put inside CollapsingToolbarLayout

I want to only show part of the image inside a CollapsingToolbarLayout as a background when the toolbar is "expanded" but no matter what scaleType and size I put for the ImageView, it looks exactly the same every time.
When I try to scale:
activity_profile.xml:
<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:fitsSystemWindows="true"
tools:context="co.magnt.classmagnet.ProfileActivity">
<android.support.design.widget.AppBarLayout
android:id="#+id/app_bar"
android:layout_width="match_parent"
android:layout_height="#dimen/app_bar_height"
android:fitsSystemWindows="true"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/toolbar_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<ImageView
android:id="#+id/profile_picture"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:background="#drawable/default_avatar"
android:scaleType="centerCrop"
app:layout_collapseMode="parallax"/>
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
app:popupTheme="#style/AppTheme.PopupOverlay"/>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
I would really appreciate any help with my issue!
EDIT: I want it the image to look something like this

Try setting android:adjustViewBounds="true" on the imageview?
http://developer.android.com/reference/android/widget/ImageView.html#attr_android:adjustViewBounds