Android可适配不规则tab的PageIndicator

<LinearLayout
android:id="@+id/ll_tab"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:orientation="horizontal">

<TextView
android:id="@+id/tab1"
style="@style/com_tab_style"
android:text="tab1"/>

<TextView
android:id="@+id/tab2"
style="@style/com_tab_style"
android:text="tab2"/>

<TextView
android:id="@+id/tab3"
style="@style/com_tab_style"
android:text="tab3"/>

<TextView
android:id="@+id/tab4"
style="@style/com_tab_style"
android:text="tab4"/>
</LinearLayout>

<bakerj.flexibleunderlinepageindicator.FlexibleUnderlinePageIndicator
android:id="@+id/indicator"
android:layout_width="match_parent"
android:layout_height="2dp"
android:layout_alignBottom="@id/ll_tab"
indicator:underlineColor="#00a0ef"/>

indicator.setUnderLineView(tab1, tab2, tab3, tab4);//关联tab
indicator.setViewPager(viewPager);//关联ViewPager