Linear Layout not visible / Overlapping

Question

I am trying to implement something like an action bar in android 2.2 . This is my main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<include
    android:id="@+id/header"
    layout="@layout/header"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content"
    />
<ScrollView    
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"

>
    <LinearLayout 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:background="@drawable/dark_button"
    >

        <Button 
            android:id="@+id/brand_id"
            android:layout_width="fill_parent"
            android:layout_height="80dip"
            android:text="@string/brand_label"
            android:textColor="@color/white"
            android:background="@drawable/dark_button"
        />
        <Button 
            android:id="@+id/car_id"
            android:layout_width="fill_parent"
            android:layout_height="80dip"
            android:text="@string/car_label"
            android:textColor="@color/white"
            android:background="@drawable/dark_button"
            android:visibility="gone"
        />
        <Button 
            android:id="@+id/model_id"
            android:layout_width="fill_parent"
            android:layout_height="80dip"
            android:text="@string/model_label"
            android:textColor="@color/white"
            android:background="@drawable/dark_button"
            android:visibility="gone"
        />
        <Button
            android:id="@+id/location_id"
            android:layout_width="fill_parent"
            android:layout_height="80dip"
            android:text="@string/location_label"
            android:textColor="@color/white"
            android:background="@drawable/dark_button"
            android:visibility="gone"
        />

        <Button 
            android:id="@+id/submit"
            android:layout_width="fill_parent"
            android:layout_height="80dip"
            android:text="@string/submit_label"
            android:textColor="@color/white"       
            android:layout_marginTop="10dip"
            android:background="@drawable/dark_button"
            android:visibility="gone"
        />
        <ProgressBar
            android:id="@+id/mainProgressBar"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:visibility="gone"
        />

    </LinearLayout>
</ScrollView>
</LinearLayout>

And this is my header.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:orientation="horizontal" 
>

<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Button"
    android:layout_weight="1" />

<ImageView
    android:id="@+id/imageView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/logo_toyota"
    android:layout_weight="1" />

<Button
    android:id="@+id/button2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"        
    android:text="Button"
    android:layout_weight="1" />

</LinearLayout>

I am getting the o/p as

I am wondering what is wrong with the code. I am new to android development. Any help is highly appreciated.

Thanks in advance Aman Gautam

Answer 1

It is showed in horizontal orientation because it is set by default

In root layout of main.xml

just put android:orientation="vertical"

Answer 2

我极力推荐这个开源项目（https://github.com/johannilsson/android-actionbar），而不是发布自己的代码，我在自己的项目中使用了它，并且对我来说效果很好。