Develop Reference

remove default margin bottom from Toolbar

In my application I use the android.support.v7.widget.Toolbar for the toolbar.
Here is my 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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.todo.app.MainActivity"
style="#style/MainActivityBg">
<android.support.design.widget.AppBarLayout
android:layout_height="wrap_content"
android:layout_width="match_parent">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:elevation="4dp"
android:theme="#style/AppTheme.AppBarOverlay"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
style="#style/AppTheme.ActionBar"/>
</android.support.design.widget.AppBarLayout>
<include layout="#layout/content_main"/>
and
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
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:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:showIn="#layout/activity_main"
tools:context="com.todo.app.MainActivity"
android:layout_marginTop="5dp"> <!-- for adding some space between the toolbar and the rest, and this is the cause of the problem! -->
<android.support.v7.widget.RecyclerView
android:id="#+id/task_list"
android:layout_width="match_parent"
android:layout_height="match_parent" />
I try to add some space between the toolbar and the rest of the view. To do that I added 5dp in marginTop to the layout which is right under the view. And this causes this problem:
While I scrolling the view there is some space remaining under the toolbar.
In my style files xml, there is no style for margin or padding.
How I can adding some space between toolbar and the rest without trigger this problem (when I scrolling the view)?

Reason
Based on the xml files, it seems to me that:
<android.support.constraint.ConstraintLayout
...
android:layout_marginTop="5dp">
is the reason for cropping RecyclerView content.
When you set the layout_marginTop between the AppBarLayout and the upper edge of ConstraintLayout appears a 5dp high empty space.
You can confirm that by turning on one of the Android options for developers: Show Layout Bounds.
Solution
For the effect which you want to achieve try to remove android:layout_marginTop and set android:paddingTop for the RecyclerView but also set android:clipToPadding to false.
Check the gif in this SO answer.
<android.support.v7.widget.RecyclerView
android:id="#+id/task_list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="5dp"
android:clipToPadding="false" />
This will allow you to add the desired space at the beginning of scrollable content but prevent cropping the items.

If the 5dp top margin isn't the problem, it may be the toolbar elevation, try to change 4dp to something much higher and check if changes your problem. Can you try same with margin top? Also a negetive margin sometimes work. Put a negetive margin on button of the toolbar and check.

How to properly add Custom View in toolbar?

I am adding a custom view in toolbar but it is not using full toolbar width it gives space from left side.
code snippet
<android.support.v7.widget.Toolbar
android:layout_width="match_parent"
android:layout_height="?android:attr/actionBarSize"
android:background="#color/colorPrimary">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/colorAccent">
</LinearLayout>
</android.support.v7.widget.Toolbar>
getting view from this code snippet
Can anyone please tell me Why it is not using full width of toolbar?

Add these 4 attributes in your toolbar it should help you override that effect.
android:contentInsetStart="0dp"
android:contentInsetLeft="0dp" app:contentInsetLeft="0dp" app:contentInsetStart="0dp"
Do let me know if this was of any help.

Actually it is only happens on Android version Lollipop and above. To remove the padding, you can set the content inset to 0dp
Add these to your toolbar
xmlns:app="http://schemas.android.com/apk/res-auto"
app:contentInsetStartWithNavigation="0dp"
It has been reported as an issue here https://code.google.com/p/android/issues/detail?id=213826

android TabLayout how to show shadow top

android TabLayout how to show shadow top
im using tablayout is bottom how to make shadow as like this
please help me ? shadow show top
<RelativeLayout
android:id="#+id/main_layout"
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=".GlobalHub.GlobalActivity">
<android.support.v4.view.ViewPager
android:id="#id/viewpager"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="#id/tablayout" />
<android.support.design.widget.TabLayout
singleLine="true"
android:id="#id/tablayout"
app:tabTextColor="#color/black"
app:tabMode="fixed"
app:tabGravity="fill"
app:tabIndicatorColor="#color/jetColor"
app:tabTextAppearance="#style/MyCustomTabLayout"
app:tabIndicatorHeight="6dp"
android:layout_width="match_parent"
android:layout_height="#dimen/_46sdp"
android:layout_alignParentBottom="true"
android:background="#drawable/shadow_tablayout"
/>

To get the shadow, use android:elevation attribute on the TabLayout in your xml file :
android:elevation="10dp"
read more about using elevation and defining shadows in Android here
If you just want the top shadow then try these 2 solutions :
OR
Wrap the Tablayout in a LinearLayout and set the background of LinearLayout as the 9patch image with top shadow.
OR
Put an ImageView above your TabLayout and set its src to be a vertical GradientDrawable defined in XML, as explained here

Toolbar not getting invisible appropriately. Please see details

I want an invisible toolbar but I want the back arrow and title to be displayed.
For achieving this, I did the following:
<?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:fitsSystemWindows="true"
tools:context="com.abc.xyz.AboutActivity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay"
android:background="#color/toolbarTransparent">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"/>
</android.support.design.widget.AppBarLayout>
<FrameLayout
android:id="#+id/header_about"
android:layout_width="match_parent"
android:layout_height="160dp"
android:background="#color/colorAccent"/>
<ImageView
android:id="#+id/a"
android:layout_width="match_parent"
android:layout_height="70dp"
android:src="#drawable/a"
app:layout_anchor="#id/header_about"
app:layout_anchorGravity="bottom|center"/>
<include layout="#layout/content_about"/>
</android.support.design.widget.CoordinatorLayout>
But, I'm getting the following result (Look how toolbar is still appearing to be there):
I want the toolbar to get invisible and only the title and back arrow to be shown.
Please let me know how can I achieve that.
Sorry for bad format of the question. I'm still a beginner here.

AppBarLayout has default elevation value and that is why you can see shadow. You can set AppBarLayout elevation to 0dp
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay"
app:elevation="0dp"
android:background="#color/toolbarTransparent">
or just remove AppBarLayout. Toolbar is transparent by default.
If you want to use AppBarLayout with transparent background on Android Lolipop version and greater - set outline provider to BACKGROUND like below:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
appBarLayout.setOutlineProvider(ViewOutlineProvider.BACKGROUND);
}
In this case when your background is transparent shadow will be not visible.

please check the android manifest file it should have AppTheme.NoActionBar then u will be able to hide it

Overlaying content above AppBarLayout using new Material Design

I want to achieve something like that. (not the FAB or the Snackbar). How can i create a layout, overlaying the AppBarLayout? Like this! (For Example)
Like Play Store:
My AppBarLayout with CoordinatorLayout and NestedScrollView with RelativeLayout as content looks like 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:id="#+id/rootLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="#dimen/_118sdp"
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"
app:contentScrim="#color/mpc_pink"
app:expandedTitleMarginStart="#dimen/_40sdp"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<de.mypostcardstore.widgets.ItemImageView
android:id="#+id/header"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"
android:src="#color/mpc_pink"
app:layout_collapseMode="parallax"
app:layout_collapseParallaxMultiplier="0.7" />
<android.support.v7.widget.Toolbar
android:id="#+id/article_toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:minHeight="?attr/actionBarSize"
app:contentScrim="#color/mpc_pink"
app:layout_collapseMode="pin"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
app:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar" />
</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"
android:background="?android:colorBackground"
android:fillViewport="true"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<RelativeLayout
android:layout_width="match_parent".....>
It would be awesome if someone could help me out. I can not find anything on the internet...
Thanks in advance!

Just add something like
app:behavior_overlapTop="64dp"
to your NestedScrollView and it will be placed above the expanded toolbar.
In addition, you should add something like
app:expandedTitleMarginBottom="70dp"
to your CollapsingToolbarLayout so the title does not appear under your overlaid scroll content.

It's quite simple, really. You could achieve that by using a combination of ToolBar, FrameLayout, and your content view (could be a ListView like your first example, or anything).
The idea is to make your FrameLayout possess the same color as your ToolBar, giving the illusion of ToolBar being much larger than it is. Then all that is left to do is to make your content view be the last (or in API 21 and above: possess the highest elevation attribute) so that it would appear as if it floats above the aforementioned FrameLayout.
See my illustration below:
Now that you got the big idea, below is some real live XML snippet for doing such thing. (I actually use this layout in one of my apps) :
<!-- Somewhere in your layout.xml -->
....
<android.support.v7.widget.Toolbar
android:id="#+id/tb_toolbar"
android:layout_width="match_parent"
android:layout_height="#dimen/abc_action_bar_default_height_material"
android:background="?attr/colorPrimary"
android:minHeight="?attr/actionBarSize"
app:contentInsetStart="72dp"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
app:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"/>
<!-- This is the 'faux' ToolBar I've been telling you about. This is the part that will be overlaid by the content view below. -->
<FrameLayout
android:id="#+id/v_toolbar_extension"
android:layout_width="match_parent"
android:layout_height="64dp"
android:layout_below="#+id/tb_toolbar"
android:background="?attr/colorPrimary"
android:elevation="2dp"/>
<!-- Normally, I use this FrameLayout as a base for inflating my fragments. You could just use put your content view here. -->
<FrameLayout
android:id="#+id/ly_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#+id/tb_toolbar"
android:elevation="3dp"/>
....
Note that my ly_content has higher elevation value than that of v_toolbar_extension. This is what will give you that desired 'overlaid toolbar' effect.
Last but not least, you would want to add this line somewhere in your activity's onCreate() :
/* Assuming mToolbar exists as a reference to your ToolBar in XML. */
setSupportActionBar(mTbToolbar);
getSupportActionBar().setElevation(0);
What that codes woud do is to set your ToolBar elevation to zero; removing preset shadows that were given as a default to ToolBars. If you don't do this, said shadow will create a "seam" between your ToolBar and your FrameLayout, thus breaking the illusion of those two being the same.
p.s., It is also important to give your content view a padding on each side. Doing so, your content view will not cover the entire width of the screen (which would render this effect useless).
Note: I see some good answers here that mentioned the absence of FrameLayout and instead making the ToolBar taller. While in theory it might work as well as my proposed solution, you might have problems when trying to manipulate scrolling; by doing that, you won't be able to separate ToolBar and its extension. You'll be forced to either make the Toolbar static or scroll all of the ToolBar altogether (makes scrolling a bit weird).
Add to that, the fact that you can't easily assign a custom drawable into a Toolbar. Hence makes it hard to follow the Google Play example you've given above. While if you're using my solution, all you'd need to do is just make your Toolbar transparent and assign the drawable to the FrameLayout instead.

I had a similar requirement and I achieved it as below.
Your activity theme should extend Theme.AppCompat.Light.NoActionBar.
I created a Layout XML File as:
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar_main"
android:layout_width="match_parent"
android:layout_height="#dimen/action_bar_size_x2"
android:background="#color/colorPrimary"
android:minHeight="?attr/actionBarSize" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
android:layout_marginTop="#dimen/action_bar_size"
android:orientation="vertical" >
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:text="#string/app_name"
android:textSize="24sp" />
</LinearLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
And the Activity should be something like this:
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar maintoolbar = (Toolbar) findViewById(R.id.toolbar_main);
setSupportActionBar(maintoolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
}
I got a view like this :

I did try to implement effects like you referred which is called Card Toolbar in Android, and it did work as expected. Here is my layout, Take a look at it:
<FrameLayout 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/background_material_light" >
<android.support.v7.widget.Toolbar
android:layout_width="match_parent"
android:layout_height="#dimen/toolbar_double_height"
android:background="?attr/colorPrimary" />
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="#dimen/cardview_toolbar_spacer"
android:layout_marginRight="#dimen/cardview_toolbar_spacer"
android:layout_marginTop="?attr/actionBarSize"
app:cardBackgroundColor="#android:color/white">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v7.widget.Toolbar
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize" />
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:alpha="0.12"
android:background="#android:color/black" />
</LinearLayout>
</android.support.v7.widget.CardView>
</FrameLayout>
Hope you'll be inspired.