How to change the new TabLayout indicator color and height

Having the problem that the new TabLayout uses the indicator color from the value colorAccent, I decided to dig into the android.support.design.widget.TabLayout implementation, finding that there are no public methods to customize this. However I found this style specification of the TabLayout:

<style name="Base.Widget.Design.TabLayout" parent="android:Widget">
    <item name="tabMaxWidth">@dimen/tab_max_width</item>
    <item name="tabIndicatorColor">?attr/colorAccent</item>
    <item name="tabIndicatorHeight">2dp</item>
    <item name="tabPaddingStart">12dp</item>
    <item name="tabPaddingEnd">12dp</item>
    <item name="tabBackground">?attr/selectableItemBackground</item>
    <item name="tabTextAppearance">@style/TextAppearance.Design.Tab</item>
    <item name="tabSelectedTextColor">?android:textColorPrimary</item>
</style>

Having this style specification, now we can customize the TabLayout like this:

<android.support.design.widget.TabLayout
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@id/pages_tabs"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="?attr/colorPrimary"
    android:minHeight="?attr/actionBarSize"
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
    app:tabIndicatorColor="@android:color/white"
    app:tabIndicatorHeight="4dp"/>

And problem solved, both the tab indicator color and height can be changed from their default values.

With the design support library you can now change them in the xml:

To change the color of the TabLayout indicator:

app:tabIndicatorColor="@color/color"

To change the height of the TabLayout indicator:

app:tabIndicatorHeight="4dp"

Since I can't post a follow-up to android developer's comment, here's an updated answer for anyone else who needs to programmatically set the selected tab indicator color:

tabLayout.setSelectedTabIndicatorColor(Color.parseColor("#FFFFFF"));

Similarly, for height:

tabLayout.setSelectedTabIndicatorHeight((int) (2 * getResources().getDisplayMetrics().density));

These methods were only recently added to revision 23.0.0 of the Support Library, which is why Soheil Setayeshi's answer uses reflection.

app:tabIndicatorColor="@android:color/white"

With the desing support library v23 you can set programmatically the color and the height.

Just use for the height:

TabLayout.setSelectedTabIndicatorHeight(int height)

Here the official javadoc.

Just use for the color:

TabLayout.setSelectedTabIndicatorColor(int color)

Here the official javadoc.

Here you can find the info in the Google Tracker.