Develop Reference

How to achieve transparent background for tab layout in collapsing toolbar ? and give a background or gradient effect to collapsing toolbar android?

My app contains a collapsing toolbar with a tablayout. The tabs have an own background color, my #color/colorPrimary. Now I would like to 'merge' the tablayout and collapsing toolbar and it should both be transparent, so the background image reaches from the toolbar down including the tabs. Like it is not divided by the background anymore.
Some what like this is needed:
And this is what my app now looks like:
My code is as follows:
<?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="#f3f3f3"
tools:context="example.jocelinthomas.dictionary.WordMeaningActivity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/collapsingtoolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:expandedTitleMarginBottom="60dp"
app:expandedTitleMarginEnd="5dp"
app:expandedTitleMarginStart="10dp"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleTextAppearance="#style/ExpandedTitleText"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<ImageView
android:layout_width="match_parent"
android:layout_height="180dp"
app:layout_collapseMode="parallax"
app:layout_collapseParallaxMultiplier="0.7"
android:scaleType="centerCrop"/>
<ImageButton
android:id="#+id/btnSpeak"
android:layout_width="25dp"
android:layout_height="25dp"
android:layout_gravity="bottom|right"
android:layout_margin="15dp"
android:background="#drawable/speaker"
app:layout_collapseMode="parallax" />
<android.support.v7.widget.Toolbar
android:id="#+id/mToolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
android:gravity="top"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light" />
</android.support.design.widget.CollapsingToolbarLayout>
<android.support.design.widget.TabLayout
android:id="#+id/tabLayout"
style="#style/TabStyle"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:layout_gravity="bottom"
android:background="#color/colorPrimary"
app:tabGravity="center"
app:tabMode="fixed"
app:tabSelectedTextColor="#color/colorAccent"
app:tabTextColor="#color/white">
</android.support.design.widget.TabLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/viewPager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
</android.support.v4.view.ViewPager>
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="16dp"
android:src="#android:drawable/ic_menu_share" />
</android.support.design.widget.CoordinatorLayout>
I want a b/g image or gradient effect to my collapsing toolbar and the tab layout background should be transparent as shown in the first image, How should I achieve this?

IT IS TOO EASY
Use this line of code inside TabLayout
android:background="#android:color/transparent"

Scroll away picture and appbar title but leave tabs in Android

I use app support and CoordinatorLayout. I was able to implement CollapsingToolbarLayout with ImageView and Toolbar that hide when scrolling. I am struggled with tabs - TabLayout is not collapsed, which is good. The problem is that it does not look nice - I want it to use bottom part of the picture as background.
I moved TabLayout within CollapsingToolbarLayout and then it uses the picture as background but there are two problems - tabs are located at top of the screen and they are hidden when scrolling.
I want to achieve the effect that it will sit at bottom of picture
and it will stay at top of the screen when other parts are scrolled away
Layout:
<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.support.design.widget.AppBarLayout
android:id="#+id/main.appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
android:fitsSystemWindows="true"
>
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/main.collapsing"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_scrollFlags="scroll|enterAlways|snap"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginStart="4dp"
app:expandedTitleMarginEnd="64dp"
>
<ImageView
android:id="#+id/main.backdrop"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"
android:fitsSystemWindows="true"
android:src="#drawable/digit1_hill"
app:layout_collapseMode="parallax"
/>
<android.support.v7.widget.Toolbar
android:id="#+id/main.toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
app:layout_collapseMode="pin"
/>
<android.support.design.widget.TabLayout
android:id="#+id/main.tabs"
android:layout_width="fill_parent"
android:layout_height="?attr/actionBarSize"
app:tabSelectedTextColor="?android:attr/textColorPrimaryInverse"
app:tabIndicatorColor="?android:attr/textColorPrimaryInverse"
app:tabIndicatorHeight="4dp"
/>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/dashboard.viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
/>
</android.support.design.widget.CoordinatorLayout>

You need to tell your Toolbar to app:layout_scrollFlags="scroll|enterAlways" and your CollapsingToolbarLayout to app:layout_scrollFlags="scroll|exitUntilCollapsed" while your TabLayout should have android:layout_gravity="bottom"
Try this:
<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.support.design.widget.AppBarLayout
android:id="#+id/main.appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
android:fitsSystemWindows="true">
<!-- Fit the system windows for your CollapsingToolbarLayout
also set your height to wrap_content and give image a height-->
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/main.collapsing"
android:fitsSystemWindows="true"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginStart="4dp"
app:expandedTitleMarginEnd="64dp">
<ImageView
android:id="#+id/main.backdrop"
android:layout_width="match_parent"
android:layout_height="244dp"
android:scaleType="centerCrop"
android:fitsSystemWindows="true"
android:src="#drawable/digit1_hill"
app:layout_collapseMode="parallax"/>
<!-- Tell your toolbar to scroll|enterAlways -->
<android.support.v7.widget.Toolbar
android:id="#+id/main.toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
app:layout_scrollFlags="scroll|enterAlways"/>
<!-- add layout_gravity="bottom" -->
<android.support.design.widget.TabLayout
android:id="#+id/main.tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
app:tabSelectedTextColor="?android:attr/textColorPrimaryInverse"
app:tabIndicatorColor="?android:attr/textColorPrimaryInverse"
app:tabIndicatorHeight="4dp"
android:layout_gravity="bottom"/>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/dashboard.viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"/>
</android.support.design.widget.CoordinatorLayout>
Update
Additionally, you should switch your theme or add a new theme:
<style name="NewAppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<!-- Include all items from original theming -->
</style>
and to hide the title create a style:
<style name="Invisible" parent="AppTheme">
<item name="android:textColor">#android:color/transparent</item>
</style>
and then set this as your collapsedTitleTextAppearance:
app:collapsedTitleTextAppearance="#style/Invisible"

Toolbar elevation/shadow (for pre lollipop) when using CollapsingToolbarLayout

Below is the code I am using to have a collapsing toolbar. It works. But at the same time I am trying to have toolbar elevation which is not working in pre lollipop devices, so I am trying to do that by applying a view with a shadow drawable. It works, but in this case, has an unintended effect as the shadow is visible all the time (see below)
I want the shadow to be visible only when only the toolbar is visible
Any advise?
<android.support.design.widget.CoordinatorLayout
android:id="#+id/main_content"
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:fitsSystemWindows="true">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="256dp"
android:fitsSystemWindows="true"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/collapsingToolbarLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginStart="72dp"
app:expandedTitleTextAppearance="#style/ExpToolbarTitleStyle"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<RelativeLayout
android:id="#+id/backdrop"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/transparent"
android:fitsSystemWindows="true"
android:scaleType="centerCrop"
app:layout_collapseMode="parallax"
app:layout_scrollFlags="scroll|enterAlways">
<ImageView
android:id="#+id/backdropimg"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:scaleType="centerCrop"
android:src="#drawable/img"/>
<com.makeramen.roundedimageview.RoundedImageView
android:id="#+id/profPic"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="48dp"
android:layout_height="48dp"
android:layout_alignParentBottom="true"
android:layout_marginBottom="16dp"
android:layout_marginLeft="16dp"
android:scaleType="fitCenter"
android:src="#drawable/imgprf"
app:riv_border_color="#color/icons"
app:riv_border_width="2dip"
app:riv_corner_radius="30dip"
app:riv_mutate_background="true"
app:riv_oval="true"/>
</RelativeLayout>
<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"/>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<View
android:id="#+id/toolbar_shadow"
style="#style/ElevationFix"
app:layout_scrollFlags="exitUntilCollapsed"
android:layout_width="match_parent"
android:layout_height="6dp"/>
<android.support.v4.view.ViewPager .........
.........
.........
</android.support.design.widget.CoordinatorLayout>

This is a bug, you can find here is Assigend as Small-Priority to Chris Banes (Android Developer).
https://code.google.com/p/android/issues/detail?id=182083

I suggest you to add the custom shadow view as foreground in your fragment container.
i did same thing in my code like:
<android.support.v4.widget.NestedScrollView
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"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
**android:foreground="#drawable/header_shadow"**>
You can do one more thing put
<item name="header_shadow" type="drawable">#null</item>
attibute in value-21 style.xml and before api 21 add it into your styles.xml like this..
<item name="header_shadow" type="drawable">#drawable/bottom_shadow</item>

CollapsibleToolbarLayout line below header image and back button not showing

I have implemented CollapsibleToolbarLayout as below.
<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">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
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"
app:contentScrim="?attr/colorPrimary"
android:fitsSystemWindows="true"
app:expandedTitleMarginEnd="40dp"
app:expandedTitleMarginStart="20dp"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/imgPoster"
android:scaleType="centerCrop"
android:fitsSystemWindows="true"
app:layout_collapseMode="parallax"
android:background="#drawable/place_holder_land" />
<View
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/detailsGradient" />
<ImageView
android:id="#+id/play"
android:layout_width="wrap_content"
android:visibility="invisible"
app:layout_collapseMode="parallax"
android:layout_gravity="center"
android:src="#drawable/ic_play_movie"
android:layout_height="wrap_content" />
</FrameLayout>
<android.support.v7.widget.Toolbar
android:id="#+id/anim_toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
app:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
android:id="#+id/scroll"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="fill_vertical"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
...LinearLayout omitted...
</android.support.v4.widget.NestedScrollView>
<android.support.design.widget.FloatingActionButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:clickable="true"
android:src="#drawable/ic_file_download"
app:layout_anchor="#+id/appbar"
app:layout_anchorGravity="bottom|right|end" />
</android.support.design.widget.CoordinatorLayout>
I add the image view in a framelayout in the toolbar so that i can have a overlay on the image and a gradient to make the toolbar text visible on some images
But this color line is coming just below the image (see screenshot) on adding the framelayout. If I remove the line
android:fitsSystemWindows="true"
from appbarlayout then the the color line disapperas but toolbar also scrolls away from the view...
Also to show the back button on the toolbar I have added the below code in OnCreate still it does not show
toolbar = FindViewById<Android.Support.V7.Widget.Toolbar>(Resource.Id.anim_toolbar);
SetSupportActionBar(toolbar);
SupportActionBar.SetDisplayHomeAsUpEnabled(true);
SupportActionBar.SetHomeButtonEnabled(true);
SupportActionBar.Title = content.Title;
toolbar.SetNavigationIcon(Resource.Drawable.ic_action);
collapsingToolbar = FindViewById<CollapsingToolbarLayout>(Resource.Id.collapsing_toolbar);
collapsingToolbar.SetTitle(content.Title);
Thanks...

OK got it now had to remove
android:fitsSystemWindows="true"
from
<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">
everything good now
Thanks

Consider adding a fixed width to your app bar layout
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="300dp"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
android:fitsSystemWindows="true">

How to make a gradient shape stay behind CollapsingToolbarLayout title

I've been playing around with Chris Bane's Cheesesquare example application regarding Collapsing Toolbar Layout and I'm having trouble adding a gradient behind the title on a collapsing toolbar so the title remains readable even if the backdrop is bright.
I've seen one solution here on stackoverflow that deals with this in a way.
That solution places the gradient "attached" to the image itself instead of the bottom of the Collapsing toolbar. What will happen is, as you scroll down, that gradient will disappear with the image as it parallaxes out of sight. I want to make the gradient follow the toolbar as it collapses (and keep the parallax effect).
This short video should make the issue clear: https://vid.me/J225
activity_contact_detail.xml
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="#dimen/detail_backdrop_height"
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"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginEnd="64dp"
app:expandedTitleMarginStart="48dp"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_collapseMode="parallax">
<ImageView
android:id="#+id/backdrop"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"
android:src="#drawable/woman"/>
<View
android:layout_width="match_parent"
android:layout_height="?actionBarSize"
android:layout_gravity="bottom"
android:background="#drawable/backdrop_bg"/>
</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"
/>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
...
<View
android:layout_width="match_parent"
android:layout_height="?actionBarSize"
android:background="#drawable/backdrop_bg"
app:layout_anchor="#id/appbar"
app:layout_anchorGravity="bottom"/>
backdrop_bg.xml
<shape
xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<gradient
android:angle="90"
android:endColor="#0000"
android:startColor="#303F9F"
android:type="linear"/>
<corners android:radius="0dp"/>
</shape>
Any help is very welcome!

Silly me, I came back to the issue and found a solution. #whaleswallace made me realize CollapsingToolBarLayout extends FrameLayout itself (so you don't need to wrap the image and gradient view in one) so it was a matter of adding android:layout_gravity="center_horizontal|bottom to the gradient view:
<android.support.design.widget.CollapsingToolbarLayout
....>
<ImageView
android:id="#+id/backdrop"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"
app:layout_collapseMode="parallax"/>
<View
android:layout_width="match_parent"
android:layout_height="72dp"
android:background="#drawable/backdrop_bg"
android:layout_gravity="center_horizontal|bottom"/>
<android.support.design.widget.CollapsingToolbarLayout/>
The image will be "parallaxing" in and out and the gradient will keep anchored to the bottom of the AppBarLayout.

<?xml version="1.0" encoding="utf-8"?>enter code here
<RelativeLayout
android:layout_height="match_parent"
android:layout_width="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android">
<android.support.design.widget.CoordinatorLayout
android:id="#+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentTop="true"
android:layout_above="#+id/btn_pri_action">
<android.support.design.widget.AppBarLayout android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="#dimen/detail_backdrop_height"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.design.widget.CollapsingToolbarLayout ` `
android:layout_width="match_parent"
android:layout_height="match_parent"
app:contentScrim="?attr/colorPrimary"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="#+id/backdrop"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"
android:fitsSystemWindows="true"
app:layout_collapseMode="parallax" />
<View
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/backdrop_bg"/>
</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" />
</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">
</android.support.v4.widget.NestedScrollView>
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
app:layout_anchor="#id/appbar"
app:layout_anchorGravity="bottom|right|end"
android:src="#drawable/ic_action_share_white"
android:layout_margin="#dimen/fab_margin"
android:clickable="true"/>
</android.support.design.widget.CoordinatorLayout>
</RelativeLayout>