Alignment issues with two-line button

Question

I'm trying to figure out why a two-line button in my application is being shifted a couple of pixels lower than the other buttons:

This does not happen if I shorten the text on the third button until it fits on one line, which tells me it has something to do with the line break. Adding android:layout_gravity="top" to the button's layout doesn't seem to help. Any ideas what might be causing this one?

Edit: Here's the layout XML file:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_height="wrap_content"
              android:orientation="vertical"
              android:gravity="center_horizontal"
              android:padding="10dip"
              android:layout_width="wrap_content">

  <TextView android:id="@+id/error_text"
            android:layout_height="wrap_content"
            android:layout_marginBottom="5dip"
            android:text="Place holder"
            android:layout_width="wrap_content"
            android:textSize="17dip"/>

  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_height="wrap_content"
                android:orientation="horizontal"
                android:gravity="center_horizontal"
                android:padding="10dip"
                android:layout_width="wrap_content">
    <Button android:id="@+id/ok_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/ok"
            android:textColor="@color/black"
            android:textStyle="bold"/>

    <Button android:id="@+id/cancel_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="8dip"
            android:text="@string/cancel_login"
            android:textColor="@color/black"
            android:textStyle="bold"
            android:visibility="gone"/>

    <Button android:id="@+id/third_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="8dip"
            android:textColor="@color/black"
            android:textStyle="bold"
            android:visibility="gone"/>
  </LinearLayout>
</LinearLayout>

Answer 1

A horizontal LinearLayout aligns the baselines of all its child controls by default. So the first line of text in your multi-line button is vertically aligned with the single line of text in the other buttons.

To disable this behaviour, set android:baselineAligned="false" on the LinearLayout.