Android ScrollView中嵌套RecyclerView布局显示不全或不显示终极解决方案！

<ScrollView
android:layout_width="match_parent"
android:layout_above="@id/send_rl"
android:layout_height="match_parent"
android:scrollbars="none">

<RelativeLayout

android:id="@+id/comment_rl"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="@dimen/_120px"
android:padding="@dimen/_10px">

<android.support.v7.widget.RecyclerView
android:id="@+id/comment_replay_rv"
android:layout_width="match_parent"
android:layout_height="wrap_content"></android.support.v7.widget.RecyclerView>
</RelativeLayout>

</ScrollView>