Develop Reference

TabLayout visual bug: gray transparent strips on both sides

There are two transparent vertical strips on both sides of my TabLayout. It looks like this:
It appeared after I removed android:theme="#style/AppTheme.ActionBar" from TabLayout, because it didn't show TabLayout indicator:
What might be the issue?
My layout:
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context="my.beeline.kz.ui.ScrollableController">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#null"
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:theme="#style/AppTheme.ActionBar"
app:layout_collapseMode="none"
app:layout_scrollFlags="scroll|enterAlways|snap"
app:titleMarginStart="#dimen/toolbar_title_margin"/>
<android.support.design.widget.TabLayout
android:id="#+id/tab_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#null"
app:tabMinWidth="120dp"
app:tabSelectedTextColor="#color/black"
app:tabTextAppearance="#android:style/TextAppearance.Widget.TabWidget"
app:tabTextColor="#color/gray_solid"/>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/gray_very_light"
app:layout_behavior="#string/appbar_scrolling_view_behavior"/>
</android.support.design.widget.CoordinatorLayout>
Update:
Solution was to remove android:background="#null" from AppBarLayout

This code worked for me I hope it worked for you :
<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.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"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light" />
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMode="fixed"
app:tabGravity="fill"/>
</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.design.widget.CoordinatorLayout>

Here I'm going to show you how to implement material design tabs in your android app.
1. Open build.gradle of app level and add design support library because TabLayout is a part of Android Design Support Library:
compile 'com.android.support:design:27.0.2'
2. Add Tab layout and View pager in you layout activity_main.xml or wherever you willing to add
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical">
<include layout="#layout/app_bar" />
<android.support.design.widget.TabLayout
android:id="#+id/tabLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="?actionBarSize"
app:tabGravity="fill"
app:tabIndicatorColor="#color/white"
app:tabIndicatorHeight="4dp"
app:tabBackground="#color/colorPrimary"
app:tabMode="fixed">
</android.support.design.widget.TabLayout>
<android.support.v4.view.ViewPager
android:id="#+id/viewPager"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v4.view.ViewPager>
</LinearLayout>
3. app_bar.xml for toolbar
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#color/colorPrimary"
android:gravity="center_vertical"
app:layout_collapseMode="pin"
app:layout_scrollFlags="scroll|enterAlways"
app:theme="#style/MyToolbarTheme"
app:title="#string/app_name"/>
4. style.xml
<style name="MyToolbarTheme"
parent="#style/ThemeOverlay.AppCompat.Dark">
<item name="colorControlNormal">#color/white</item>
<item name="titleTextColor">#color/white</item>
</style>
Some options to customize tabs appearance:
app:tabGravity=”fill” for Navigation tab gravity. Other is the centre for placing navigation tabs from centre
app:tabIndicatorColor=”#color/white” for an indicator in tabs. Here you can see the white indicator.
app:tabIndicatorHeight=”4dp” for indicator height.
app:tabMode=”fixed” for tab mode. Other is scrollable for many more tabs.
app:tabTextColor=”#color/semi_yellow” for unselected tab text color.
app:tabSelectedTextColor=”#color/yellow” for selected tab text color.
If you want to add icons to tab, you have to do is call setIcon() method of the tab. Create icon array and assign each one for each tab like this:
Tabs with the icon:
private int[] tabIcons = {
R.drawable.home,
R.drawable.notification,
R.drawable.star
};
tabLayout.getTabAt(0).setIcon(tabIcons[0]);
tabLayout.getTabAt(1).setIcon(tabIcons[1]);
tabLayout.getTabAt(2).setIcon(tabIcons[2]);
And the time of Result:
Without icon
Happy Coding!!!

ViewPager taking space below the bar

I have a layout coded like below
<?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:id="#+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".activities.HomepageActivity">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#drawable/header_copy">
<!--android:background="#072120"-->
<!--android:background="#drawable/header_copy-->
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:titleTextColor="#FFFADE09"
app:titleMarginStart="100dp"
app:titleTextAppearance="#style/TabLayoutTextStyle"
app:layout_scrollFlags="scroll|enterAlways|snap"
app:popupTheme="#style/AppTheme.PopupOverlay"
>
<!--android:background="#FF008080"-->
</android.support.v7.widget.Toolbar>
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMode="scrollable"
app:tabGravity="fill"
app:tabTextColor="#FFFADE09"
app:tabSelectedTextColor="#F7FFFFFF"
app:tabTextAppearance="#style/TabLayoutTextStyle" />
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>
But this result the below UX
The viewPager is taking space below the bottom bar. But I do not want this behaviour. I want the viewPager take only that visible screen space. Please help me here.

Since your tab bar will always be at the top, and the rest of the views will be under the toolbar, you can replace CoordinatorLayout for a LinearLayout with orientation="vertical" fixes the overflowing issue.

here you are using android.support.design.widget.CoordinatorLayout, the topmost behavior of CoordinatorLayout is appbar_scrolling_view_behavior so is getting extra space in bottom equivalent to the android.support.design.widget.AppBarLayout size.
in this case, you should use LinearLayout or RelativeLayout instead of android.support.design.widget.CoordinatorLayout

Custom layout in Toolbar with TabLayout below

Right now, I have a normal looking Toolbar. What I want to do is add a custom layout between the Toolbar and the TabLayout, as shown in the picture below:
On the left is what my Toolbar looks like now, and on the right is what I want it to look like.
As you can see, I want to add an ImageView and two TextViews to the layout.
How can I achieve this?
Here is my current 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.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/AppTheme.PopupOverlay" />
<android.support.design.widget.TabLayout
android:id="#+id/tablayout"
android:layout_width="match_parent"
android:layout_height="48dp"
app:layout_scrollFlags="scroll|enterAlways" />
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>

AppBarLayout extends LinearLayout, so you can add any number of views to your AppBarLayout: there's no reason to add the views specifically to your Toolbar.
You'll want to make sure you use the same layout_scrollFlags as your Toolbar if you want them to scroll the same.

Toolbar is just a ViewGroup, you can customize is as much as you want.
Try this :
<android.support.v7.widget.Toolbar
style="#style/ToolBarStyle"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:minHeight="#dimen/abc_action_bar_default_height_material">
<ImageView
android:layout_width="wrap_content"
android:contentDescription="#string/logo"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:src="#drawable/ic_launcher"/>
This should bring your imageView in center of toolbar.

Tablayout and Toolbar are not on the same height

i am building an application in which i want the Activity to have a bottomBar and each item of it to be a fragment. The first fragment should have a viewpager. Everything works fine except the fact that TabLayout and Toolbar do not have the same height.
The problem is:
and my activity layout is:
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<include
android:id="#+id/toolbar"
layout="#layout/toolbar_top" />
</android.support.design.widget.AppBarLayout>
my toolbarTop layout:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:theme="#style/Base.ThemeOverlay.AppCompat.Dark"
android:id="#+id/topBar"
android:background="#color/colorPrimary">
</android.support.v7.widget.Toolbar>
and my tablayout fragment:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_marginBottom="?android:attr/actionBarSize"
android:layout_height="match_parent">
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
app:tabMaxWidth="0dp"
app:tabGravity="fill"
app:tabMode="fixed"
android:elevation="6dp"
android:layout_height="?android:attr/actionBarSize"
android:background="#color/colorPrimary" />
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
app:layout_scrollFlags="scroll|enterAlways|snap"
android:layout_height="wrap_content" />
</LinearLayout>
I have tried this answer but it was not successful. I cannot put the tablayout in the Appbarlayout(which solves the problem) because every fragment will have a tablayout.
Any other ideas to solve this problem?

You need to include it in the AppbarLayout so, to do that Add the TabLayout to toolbarTop.xml file below the toolbar.

Position ViewPager within CoordinatorLayout

I have a ViewPager within a CoordinatorLayout:
<android.support.v4.view.ViewPager
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="fill_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
/>
It's a little faint in the picture, but the blue box is after the toolbar.
It puts the ViewPager after the ToolBar and TabBar, but the height extends too much. I want the height to fill the parent.
If I remove the layout behavior it works, but I don't know how much the marginTop should be (there's the ActionBar's height + TabBar's height).
<android.support.v4.view.ViewPager
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_marginTop="150dp"
/>
I want to have the ViewPager be after the toolbar and extend to the end of the device.
This is the entire XML:
<?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:id="#+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context=".MainView">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="#dimen/appbar_padding_top"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/AppTheme.PopupOverlay">
</android.support.v7.widget.Toolbar>
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="fill_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
/>
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end|bottom"
android:layout_margin="#dimen/fab_margin"
android:src="#android:drawable/ic_dialog_email" />
</android.support.design.widget.CoordinatorLayout>

The behavior is because of your current configuration of the app:layout_scrollFlags. If you don't android to push the ViewPager down set it to an empty String app:layout_scrollFlags="". You can change its behavior afterwards if you need/have/want to.
you should wrap the AppBarLayout and the ViewPager in the CoordinatorLayour and add app:layout_behavior="#string/appbar_scrolling_view_behavior" to the ViewPager. That line does the trick. Avoid that the content of your ViewPager goes behind the Toolbar/TabLayout