Android - 在RelativeLayout中平分两个控件

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <View
        android:id="@+id/eton_placeholder"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_centerHorizontal="true"/>

    <TextView
        android:id="@+id/eton_cardio_face_entry_text_view"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@id/eton_chunyu_doctor_entry_text_view"
        android:layout_toLeftOf="@id/eton_placeholder"
        android:background="@color/pink"
        android:gravity="center"
        android:text="心率监测"
        android:textSize="36dp"/>

    <TextView
        android:id="@+id/eton_pedometer_entry_text_view"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_below="@id/eton_chunyu_doctor_entry_text_view"
        android:layout_toRightOf="@id/eton_placeholder"
        android:background="@color/orange"
        android:gravity="center"
        android:text="计步器"
        android:textSize="36dp"/>

</RelativeLayout>