android 两个button 紧靠

Question

            <Button
                android:id="@+id/bag7"
                style="?android:attr/borderlessButtonStyle"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_margin="0dp"
                android:adjustViewBounds="true"
                android:gravity="left|center_vertical"
                android:text="" />如图，竖排的两个button设置好margin也粘不到一起，求指点
Android布局

Answer 1

android:gravity="left|center_vertical"

Answer 2

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="button1" />    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="-8dp"
        android:text="button2" />
</LinearLayout>