android tablayout选中的字体颜色及大小改变

布局

 <com.google.android.material.tabs.TabLayout
            android:id="@+id/tabLay"
            android:layout_width="match_parent"
            android:layout_height="@dimen/dp_35"
            android:layout_marginBottom="@dimen/dp_10"
            app:tabIndicatorHeight="@dimen/dp_0"
            app:tabMode="scrollable"
            app:tabSelectedTextColor="@color/black"
            app:tabTextAppearance="@style/TabLayoutTextSize"
            app:tabTextColor="@color/silvery" />

style样式

<!--设置Tablayout字体大小-->
    <style name="TabLayoutTextSize">
        <item name="android:textSize">@dimen/sp_15</item>
        <item name="android:textStyle">bold</item>
    </style>
    <!--设置Tablayout字体加粗-->
    <style name="TabLayoutTextStyle">
        <item name="android:textStyle">bold</item>
    </style>

tablayout的监听事件处理

tabLay.addOnTabSelectedListener(object : TabLayout.OnTabSelectedListener{
            override fun onTabReselected(tab: TabLayout.Tab?) {
            }

            override fun onTabUnselected(tab: TabLayout.Tab?) {
                val title =
                    ((tabLay.getChildAt(0) as LinearLayout).getChildAt(tab!!.position) as LinearLayout).getChildAt(
                        1
                    ) as TextView
                title.apply {
                    setTextAppearance(context, R.style.TabLayoutTextStyle)
                    setTypeface(Typeface.defaultFromStyle(Typeface.NORMAL))
                }
            }

            override fun onTabSelected(tab: TabLayout.Tab?) {
                tabIndex = tab?.position ?: 0
                pageIndex = 1

                val title =
                    ((tabLay.getChildAt(0) as LinearLayout).getChildAt(tab!!.position) as LinearLayout).getChildAt(
                        1
                    ) as TextView

                title.apply {
                    setTextAppearance(context, R.style.TabLayoutTextStyle)
                    setTypeface(Typeface.defaultFromStyle(Typeface.BOLD))
                }
            }
        })