I have a LinearLayout and inside, a ImageView and TextView. I want to align the center of the LinearLayout the ImageView and the TextView below the ImageView. 

I only get the top align ImageView in LinearLayout. How I can do?

```
       <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_gravity="center_horizontal"
            android:layout_weight="1"
            android:layout_margin="8dp"
            android:gravity="center_horizontal"
            android:orientation="vertical" >

            <ImageView
                android:id="@+id/boton"
                android:layout_width="90dp"
                android:layout_height="90dp"
                android:layout_gravity="center"
                android:background="@drawable/plano"
                android:gravity="center" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Plano"
                android:textSize="23sp"
                android:textStyle="bold"
                />

        </LinearLayout>

```