fragment_a.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical">    <EditText        android:layout_width="match_parent"        android:layout_height="0dp"        android:layout_weight="1"        android:hint="羞羞的铁拳  ，开心麻花" />    <android.support.design.widget.TabLayout        android:id="@+id/tl_titles"        android:layout_width="match_parent"        android:layout_height="0dp"        android:layout_weight="1"></android.support.design.widget.TabLayout>    <android.support.v4.view.ViewPager        android:id="@+id/viewpager"        android:layout_width="match_parent"        android:layout_height="0dp"        android:layout_weight="8"></android.support.v4.view.ViewPager></LinearLayout>