Develop Reference

Custom indicator in Android

I need to do a custom tab indicator for my tab layout. It will be linked to a ViewPager with a TabLayoutMediator. The layout that I need is this:
And I am currently getting this:
Anyone knows why? You can see my XML code below.
Layout where TabLayout is:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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/whiteCandy"
android:fitsSystemWindows="true">
<androidx.viewpager2.widget.ViewPager2
android:id="#+id/onBoardingViewPager"
android:layout_width="match_parent"
android:layout_height="#dimen/dimen_0"
android:layout_marginStart="#dimen/tablet_default_margin"
android:layout_marginTop="#dimen/dimen_40"
android:layout_marginEnd="#dimen/tablet_default_margin"
android:layout_marginBottom="#dimen/dimen_75"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<com.google.android.material.tabs.TabLayout
android:id="#+id/tabDots"
android:layout_width="wrap_content"
android:layout_height="#dimen/dimen_6"
android:layout_marginStart="#dimen/dimen_30"
android:layout_marginBottom="#dimen/dimen_75"
android:background="#android:color/transparent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="#id/onBoardingViewPager"
app:tabBackground="#drawable/tab_selector"
app:tabIndicatorHeight="#dimen/dimen_0"
app:tabPaddingEnd="#dimen/dimen_6" />
</androidx.constraintlayout.widget.ConstraintLayout>
Tab Selector:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#drawable/selected_dot" android:state_selected="true" />
<item android:drawable="#drawable/default_dot" />
</selector>
Selected state drawable:
<?xml version="1.0" encoding="utf-8"?>
<shape android:shape="rectangle" xmlns:android="http://schemas.android.com/apk/res/android">
<corners android:radius="#dimen/dimen_3"/>
<solid android:color="#FFFF0000"/>
<size android:height="#dimen/dimen_6" android:width="#dimen/dimen_20"/>
</shape>
Unselected state drawable:
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape
android:innerRadius="#dimen/dimen_0"
android:shape="ring"
android:thickness="#dimen/dimen_6"
android:useLevel="false">
<solid android:color="#80FF0000" />
</shape>
</item>
</layer-list>

for unselected:
<shape android:shape="oval">
<solid android:color="#80FF0000" />
<size
android:width="4dp"
android:height="4dp" />
</shape>

Custom drawable as tabIndicator of com.google.android.material.tabs.TabLayout not working

I am trying to set custom drawable as tabIndicator as shown below
<com.google.android.material.tabs.TabLayout
android:id="#+id/tab_layout"
app:tabIndicatorFullWidth="false"
app:layout_scrollFlags="scroll"
app:tabIndicator="#drawable/tab_layout_indicator_selected"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
drawable/tab_layout_indicator_selected
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="rectangle">
<corners android:radius="2dp" />
<gradient
android:angle="180"
android:endColor="#FF00FF"
android:startColor="#00FFFF"
android:type="linear" />
<size
android:width="60dp"
android:height="4dp" />
</shape>
</item>
<item android:gravity="end">
<shape android:shape="oval">
<solid android:color="#FF00FF" />
<size
android:width="4dp"
android:height="4dp" />
</shape>
</item>
</layer-list>
This shows shape of indicator as my drawable but its color remains always gray, not as given in drawable.

I had the same issue when using a custom drawable. What fixed it for me was setting the tab indicator height.
app:tabIndicatorHeight="2dp"

There is a separate attribute for the tab indicator color:
<com.google.android.material.tabs.TabLayout
...
app:tabIndicatorColor="?colorPrimary"
/>

Use app:tabBackground with selector

I've tried a massive of cases, and found it worked when you set the 【tabIndicator】 and also set the 【tabIndicatorColor (the color equals the color of your drawable)】.
My codes:
<com.google.android.material.tabs.TabLayout
android:id="#+id/tab_layout"
android:layout_width="wrap_content"
android:layout_height="40dp"
android:layout_marginStart="12dp"
app:tabIndicator="#drawable/tab_indicator_background"
app:tabIndicatorColor="#color/Ga1"
app:tabIndicatorGravity="center"
app:tabMode="scrollable"
app:tabRippleColor="#android:color/transparent"
app:tabSelectedTextColor="#color/theme_color_secondary"
app:tabTextColor="#color/Ga8" />
drawable/tab_indicator_background：
<layer-list xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<item android:gravity="center">
<shape>
<size
android:width="74dp"
android:height="28dp" />
<corners android:radius="4dp" />
<solid android:color="#color/Ga1" />
</shape>
</item>

in my case, combine tabIndicatorColor and tabIndicatorHeight will make tabIndicator drawable work
app:tabIndicatorColor="#null"
app:tabIndicatorHeight="10dp"
app:tabIndicator="#drawable/tab_indicator_drawable"
You can also use android:background="#null" to remove the default background of the TabLayout

How to show a circle tab indicator along Viewpager?

I want to show a tabindicator as in the image below.
I am using viewpager. I already tried TabLayout with viewpager, in which we can only adjust tab indicator color and height. How can I implement this.

when seleted 'tab_selected.xml'
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape
android:shape="ring"
android:useLevel="false"
android:thickness="4dp"
android:innerRadius="0dp">
<solid android:color="#000"/>
</shape>
</item>
</selector>
when not selected 'tab_unselected'
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape
android:shape="ring"
android:useLevel="false"
android:thickness="4dp"
android:innerRadius="0dp">
<solid android:color="#3b000000"/>
</shape>
</item>
</selector>
now when state_presses is true or not 'tab'
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#drawable/tab_selected"
android:state_selected="true"/>
<item android:drawable="#drawable/tab_unseleted"/>
</selector>
now in tablayout
<android.support.design.widget.TabLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/tablayout"
android:layout_alignParentBottom="true"
app:tabIndicatorHeight="0dp"
app:tabGravity="center"
app:tabBackground="#drawable/tab"/>

Keep it simple and just use one XML file.
tab_indicator_circle.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:innerRadius="0dp"
android:shape="ring"
android:thickness="4dp"
android:useLevel="false">
<size
android:width="4dp"
android:height="4dp" />
<solid android:color="#color/colorAccent" />
</shape>
Usage:
<com.google.android.material.tabs.TabLayout
android:id="#+id/myTabLayout"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:tabIndicator="#drawable/tab_indicator_circle"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:tabIndicatorHeight="10dp"
app:tabGravity="center" />
Note that I'm using TabLayout from
implementation "com.google.android.material:material:1.1.0-alpha10"

Here's how I achieved it
tab_indicator.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:width="8dp"
android:height="8dp"
android:bottom="16dp"
android:end="8dp"
android:gravity="center"
android:start="8dp"
android:top="8dp">
<shape android:shape="rectangle">
<size android:width="8dp" android:height="8dp" />
<corners android:radius="4dp" />
<solid android:color="?attr/colorAccent" />
</shape>
</item>
</layer-list>
Important thing is to have fixed width and height.
Usage:
<com.google.android.material.tabs.TabLayout
android:id="#+id/tab_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabIndicatorHeight="8dp"
app:tabIndicator="#drawable/tab_indicator" />

Set color to unselected tab indicator in tab layout

I am using tablayout provided by google and everything is working fine except the color of the unselected tab indicator. I am unable to set the unselected tab indicator color.
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"
style="#style/MyCustomTabLayout"
/>
</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>

**1.app:**
tabBackground="#drawable/tablayout_selector"
**2.tablayout_selector.xml**
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="rectangle">
<solid android:color="#color/shl_common_default_color" />
</shape>
</item>
<item>
<inset android:insetBottom="1.5dp">
<shape android:shape="rectangle">
<solid android:color="#color/white" />
</shape>
</inset>
</item>
</layer-list>
or
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="rectangle">
<solid android:color="#color/white" />
</shape>
</item>
<item android:gravity="bottom">
<shape android:shape="rectangle">
<solid android:color="#color/shl_common_default_color" />
<size android:height="1.5dp" />
</shape>
</item>
</layer-list>

try this changing the color as you wish:
Create this file in drawable folder
tab_indicator_color.xml:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<!-- UNSELECTED TAB STATE -->
<item android:state_selected="false" android:state_pressed="false">
<layer-list>
<!-- Bottom indicator color for the UNSELECTED tab state -->
<item android:top="-5dp" android:left="-5dp" android:right="-5dp">
<shape android:shape="rectangle">
<stroke android:color="#65acee" android:width="2dp"/>
</shape>
</item>
</layer-list>
</item>
</selector>
and after set your .xml file in app:tabBackground like this:
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMode="fixed"
style="#style/MyCustomTabLayout"
app:tabBackground="#drawable/tab_indicator_color" />

ic_tab_indicator_default.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="rectangle" />
</item>
<item android:gravity="bottom">
<shape android:shape="rectangle">
<size android:height="1dp" />
<solid android:color="#color/steel_blue" />
</shape>
</item>
</layer-list>
ic_tab_indicator_selected.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="rectangle" />
</item>
<item android:gravity="bottom">
<shape android:shape="rectangle">
<size android:height="3dp" />
<solid android:color="#color/congress_blue" />
</shape>
</item>
</layer-list>
selector_tab_indicator.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#drawable/ic_tab_indicator_selected" android:state_selected="true" />
<item android:drawable="#drawable/ic_tab_indicator_default" />
</selector>
TabLayout
<com.google.android.material.tabs.TabLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabIndicator="#android:color/transparent"
app:tabBackground="#drawable/selector_tab_indicator">

For people using the new com.google.android.material.tabs.TabLayout if you apply the solution given as the correct answer in this post would get corners on all four sides of the tab
To fix that use the following "hack"
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<!-- UNSELECTED TAB STATE -->
<item android:state_selected="false" android:state_pressed="false">
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<!-- Bottom indicator color for the UNSELECTED tab state -->
<item android:top="-10dp" android:left="-1000dp" android:right="-1000dp">
<shape android:shape="rectangle" >
<stroke android:color="#4cffffff" android:width="1dp"/>
</shape>
</item>
</layer-list>
</item>
</selector>

If your TabLayout don't need title, but need indicator for unselected color.
You can do like
<com.google.android.material.tabs.TabLayout
android:id="#+id/tab_layout"
android:layout_width="match_parent"
android:layout_height="10dp"
app:tabBackground="#drawable/tab_normal"
app:tabIndicator="#drawable/tab_indicator"
app:tabIndicatorColor="#null"
app:tabIndicatorHeight="10dp" />
The workaround here is
Using both tabBackground and tabIndicator
Indicator height equals to TabLayout height
tab_normal.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="#aaaaaa" />
<corners android:radius="5dp" />
</shape>
tab_indicator.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="#ff0000" />
<corners android:radius="5dp" />
</shape>
If you need a padding between indicator, you can use layer-list drawable with some padding (instead of using shape)
If you just only need a color for tab indicator, no need to define shape drawable, can use
app:tabBackground="#color/gray"
app:tabIndicatorColor="#color/red"

Change drawable of scrollbarThumbVertical when scrolling is active

i tried to change the drawable of the scrollbar with a selector (state_pressed, state_focus, ...) but i didn't work.
scrollview
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/scroll"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:scrollbarSize="5dp"
android:scrollbarThumbVertical="#drawable/custom_scrollbar" >
selector
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item
android:state_pressed="true"
android:drawable="#drawable/scrollbar_pressed" />
<item
android:state_focused="true"
android:drawable="#drawable/scrollbar_pressed" />
<item android:drawable="#drawable/scrollbar" />
</selector>
one of the two drawables. the only difference is the color
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<gradient
android:startColor="#color/grey"
android:endColor="#color/dark_grey"
android:angle="0" />
<stroke
android:width="1dp"
android:color="#color/white"/>
<corners android:radius="6dp" />
</shape>
any other solution for this?