android - ImageView appears in the wrong place in LinearLayout -

i'm following tutorial head first android development , can't figure out why linearlayout not working should.

here xml code:

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" tools:context=".mainactivity"  android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent">  <textview     android:id="@+id/imagetitle"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:text="@string/test_image_title"/>  <textview     android:id="@+id/imagedate"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:text="@string/test_image_date"/>  <imageview     android:id="@+id/imagedisplay"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:src="@drawable/test_image"/>  <textview     android:id="@+id/imagedescription"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:text="@string/test_image_description"/>  </linearlayout> 

the problem image goes in middle, image should under 2 lines of text displayed on upper side, not in middle. last textview isn't shown @ all. should show in order declared in xml.

aleast that's tutorial showed.

i tried putting imageview part on top of textviews , no text @ , image still in middle.

now has behavior changes since book released or missing something?

i found answer from: imageview in android xml layout layout_height="wrap_content" has padding top & bottom

you need add imageview:

android:adjustviewbounds="true" 

for reason wrap_content not work height without line.