Develop Reference

ScrollView Still comes Behind out of it's Area

This Is My Xml.
.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.xxx.xxx.MyActivity" >
<LinearLayout
android:id="#+id/viewFromDateToDate"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_gravity="center"
android:layout_marginBottom="10dp"
android:layout_marginTop="10dp"
android:gravity="center"
android:orientation="horizontal" >
<EditText
android:id="#+id/txtFromDate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:drawableRight="#drawable/timesheet_icon"
android:editable="false"
android:focusableInTouchMode="false"
android:hint="#string/txtFromDate"
android:inputType="date"
android:onClick="selectDate"
android:textSize="#dimen/generalTextSize" />
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
android:text="#string/lblFromTo"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textSize="#dimen/generalTextSize" />
<EditText
android:id="#+id/txtToDate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:drawableRight="#drawable/timesheet_icon"
android:editable="false"
android:focusableInTouchMode="false"
android:hint="#string/txtToDate"
android:inputType="date"
android:onClick="selectDate"
android:textSize="#dimen/generalTextSize" />
<Button
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:background="#drawable/green_button_department"
android:text="#string/btnShowData"
android:textColor="#color/white" />
</LinearLayout>
<View
android:id="#+id/upperSeparator"
android:layout_width="fill_parent"
android:layout_height="1dp"
android:layout_below="#id/viewFromDateToDate"
android:layout_marginTop="15dp"
android:background="#android:color/darker_gray" />
<LinearLayout
android:id="#+id/viewTimeOffDetailsHeader"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/upperSeparator"
android:orientation="horizontal"
android:padding="10dp" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="3"
android:text="#string/txtHeaderTimeOff"
android:textSize="#dimen/generalTextSize" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="2"
android:text="#string/txtHeaderDate"
android:textSize="#dimen/generalTextSize" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="#string/txtHeaderHours"
android:textSize="#dimen/generalTextSize" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/txtHeaderAction"
android:textSize="#dimen/generalTextSize" />
</LinearLayout>
<View
android:id="#+id/lowerSeparator"
android:layout_width="fill_parent"
android:layout_height="1dp"
android:layout_below="#id/viewTimeOffDetailsHeader"
android:background="#android:color/darker_gray" />
<ScrollView
android:id="#+id/scrollDiv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/lowerSeparator" >
<LinearLayout
android:id="#+id/viewTimeOffDetailsArea"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
</LinearLayout>
</ScrollView>
<LinearLayout
android:id="#+id/viewTimeOffDetailsFooter"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_gravity="center"
android:gravity="center"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
</LinearLayout>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:layout_marginLeft="15dp"
android:background="#drawable/green_button_department"
android:text="#string/btnSubmitTimeOff"
android:textColor="#color/white"
android:textSize="20sp" />
</LinearLayout>
</RelativeLayout>
I want my LinerLayout scrollDiv to Be in Between of lowerSeparator and viewTimeOffDetailsFooter But the problem is ScrolView is still displaying it's Elements After viewTimeOffDetailsFooter Starts.
.
Here is an output.
Of XML Layout
Here you can see the Buttons of scrollDiv Still Displays after viewTimeOffDetailsFooter Buttons. I know that i should not put whole File But i am not getting proper solution that's why. Thanks.

you just need to place it above the viewTimeOffDetailsFooter, by adding below attribute to your scrollDiv
android:layout_above="#+id/viewTimeOffDetailsFooter"

Your viewTimeOffDetailsFooter doesn't have any positional link with scrollDiv, so add to it new rule android:layout_below="#id/scrollDiv". It can work only without android:layout_alignParentBottom="true" rule - need to try.

Android Linear Layout Suggestion

How do I get buttons to lay on the screen most optimally distributed and centered on the screen as follows:
The nearest I am able to get is this:
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:orientation="horizontal"
>
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:text="Button1" />
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Button2" />
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Button3" />
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Button4" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:text="Button5"
android:layout_weight="1"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button6"
android:layout_weight="1"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button7"
android:layout_weight="1"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Button8"
android:layout_weight="1"/>
</LinearLayout>

Use a relativeLayout for the 3 linearLayouts.
To place the 3 linears below eachother use:
android:layout_below="#+id/linearLayout1"
and
android:layout_below="#+id/linearLayout2"
To center the linears use:
android:layout_centerInParent="true"
android:layout_gravity="center_vertical"
That will give you something like this:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<LinearLayout
android:id="#+id/linearLayout2"
android:layout_below="#+id/linearLayout1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_gravity="center_vertical" >
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Button5" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Button6" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Button7" />
</LinearLayout>
<LinearLayout
android:id="#+id/linearLayout3"
android:layout_below="#+id/linearLayout2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_gravity="center_vertical" >
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button8" />
</LinearLayout>
<LinearLayout
android:id="#+id/linearLayout1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true" >
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Button1" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Button2" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Button3" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Button4" />
</LinearLayout>
Unfortunately it is not showing the last line which is </RelativeLayout>

Heigth of ImageView

i want to add two imageViews in one layout, images i will set from galery (diferent size of image).Defaut images- all is ok. But when i set image from galery (image one)- a get a lot free space (image two)
2:
<ScrollView
android:id="#+id/scrollView1"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Exrcise name"
android:textAppearance="?android:attr/textAppearanceMedium" />
<EditText
android:id="#+id/et_exrcise_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:ems="10"
android:inputType="textPersonName" >
<requestFocus />
</EditText>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Image"
android:textAppearance="?android:attr/textAppearanceMedium" />
<RadioGroup
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<RadioButton
android:id="#+id/radio_anime"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="true"
android:onClick="onRadioButtonClicked"
android:text="anime" />
<RadioButton
android:id="#+id/radio_static"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="onRadioButtonClicked"
android:text="static" />
</RadioGroup>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<ImageView
android:id="#+id/iv_image_one"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_marginLeft="5dp"
android:layout_weight="1"
android:scaleType="centerInside"
android:src="#drawable/btn_apply_oval_new" />
<ImageView
android:id="#+id/iv_image_two"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_marginLeft="10dp"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:scaleType="centerInside"
android:src="#drawable/btn_apply" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<Button
android:id="#+id/btn_set_image_one"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Button" />
<Button
android:id="#+id/btn_set_image_two"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Button" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TextView
android:id="#+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Muscle group"
android:textAppearance="?android:attr/textAppearanceMedium" />
<Spinner
android:id="#+id/spinner_muscle_group"
android:layout_width="wrap_content"
android:layout_height="45dp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TextView
android:id="#+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Description"
android:textAppearance="?android:attr/textAppearanceMedium" />
<EditText
android:id="#+id/et_description"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:ems="10"
android:inputType="textMultiLine" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TextView
android:id="#+id/textView5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Tecnique"
android:textAppearance="?android:attr/textAppearanceMedium" />
<EditText
android:id="#+id/et_tecnique"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:ems="10"
android:inputType="textMultiLine" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<Button
android:id="#+id/btn_save_exercise"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="SAVE" />
<Button
android:id="#+id/test_anim"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
</LinearLayout>
</LinearLayout>
</ScrollView>

try
android:adjustViewBounds="true"
It worked for a similar problem i've had some time ago.

have you tried to set the height of both the problematic linearLayout and the imageView to wrap_content?
also, have you tried to set a weight (to 1) to the problematic linearLayout and then set its height to 0px ?

How to stretch the component to match the width of parent components in Android layout?

Below is the layout I designed.
Here is my code:
<LinearLayout
android:id="#+id/digitRow1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="horizontal" >
<Button
android:id="#+id/button1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="#string/login_button_1" />
<Button
android:id="#+id/button2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="#string/login_button_2" />
<Button
android:id="#+id/button3"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="#string/login_button_3" />
</LinearLayout>
<LinearLayout
android:id="#+id/digitRow2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="horizontal" >
<Button
android:id="#+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/login_button_4" />
<Button
android:id="#+id/button5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/login_button_5" />
<Button
android:id="#+id/button6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/login_button_6" />
</LinearLayout>
<LinearLayout
android:id="#+id/digitRow3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="horizontal" >
<Button
android:id="#+id/button7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/login_button_7" />
<Button
android:id="#+id/button8"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/login_button_8" />
<Button
android:id="#+id/button9"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/login_button_9" />
</LinearLayout>
<LinearLayout
android:id="#+id/digitRow4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<Button
android:id="#+id/buttonClear"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/login_button_clear" />
<Button
android:id="#+id/button0"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/login_button_0" />
<Button
android:id="#+id/buttonBack"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/login_button_back" />
</LinearLayout>
<LinearLayout
android:id="#+id/buttonRow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:orientation="horizontal"
android:padding="5dp" >
<Button
android:id="#+id/buttonChange"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/login_button_dhange" />
<Button
android:id="#+id/buttonDisable"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/login_button_disable" />
</LinearLayout>
The problem is that I want to stretch the bottom two buttons, "Change" and "Back", to match the width of the buttons above.

You can use weight on both of them, like this:
<LinearLayout
android:id="#+id/buttonRow"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:orientation="horizontal"
android:padding="5dp" >
<Button
android:id="#+id/buttonChange"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1.0"
android:text="#string/login_button_dhange" />
<Button
android:id="#+id/buttonDisable"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1.0"
android:text="#string/login_button_disable" />

You probably want something like the code below.
I used a hard coded button width, but you probably want to put this in dimen.xml and reference it. I centered everything with gravity.
I tried this with weights as well, but the re-sizing is funny. As your screen gets wider the buttons get two wide.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:gravity="center_horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:id="#+id/digitRow1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="horizontal" >
<Button
android:id="#+id/button1"
android:layout_width="100dp"
android:layout_height="match_parent"
android:text="1" />
<Button
android:id="#+id/button2"
android:layout_width="100dp"
android:layout_height="match_parent"
android:text="2" />
<Button
android:id="#+id/button3"
android:layout_width="100dp"
android:layout_height="match_parent"
android:text="3" />
</LinearLayout>
<LinearLayout
android:id="#+id/digitRow2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="horizontal" >
<Button
android:id="#+id/button4"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="4" />
<Button
android:id="#+id/button5"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="5" />
<Button
android:id="#+id/button6"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="6" />
</LinearLayout>
<LinearLayout
android:id="#+id/digitRow3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="horizontal" >
<Button
android:id="#+id/button7"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="7" />
<Button
android:id="#+id/button8"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="8" />
<Button
android:id="#+id/button9"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="9" />
</LinearLayout>
<LinearLayout
android:id="#+id/digitRow4"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="horizontal" >
<Button
android:id="#+id/buttonClear"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="Clear" />
<Button
android:id="#+id/button0"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="0" />
<Button
android:id="#+id/buttonBack"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="Back" />
</LinearLayout>
<LinearLayout
android:id="#+id/buttonRow"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:orientation="horizontal"
android:padding="5dp"
android:gravity="center_horizontal"
>
<Button
android:id="#+id/buttonChange"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:text="Change" />
<Button
android:id="#+id/buttonDisable"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:text="Disable" />
</LinearLayout>

Try to use weight like below. Also use margins to tweak the positions of the buttons.
<LinearLayout
android:id="#+id/buttonRow"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:orientation="horizontal"
android:padding="5dp" >
<Button
android:id="#+id/buttonChange"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1.0"
android:text="#string/login_button_dhange" />
<Button
android:id="#+id/buttonDisable"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1.0"
android:text="#string/login_button_disable" />

How to create a divider in a dialog box

I have a dialog box with two buttons at the bottom. How do I create a divider above these buttons? My XML is as follows:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="400dp"
>
<ImageView
android:id="#+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/username"
android:layout_alignParentLeft="true" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:orientation="horizontal">
<Button
android:id="#+id/start"
android:textSize="18sp"
android:layout_marginRight="2dip"
android:layout_width="wrap_content"
android:layout_marginBottom="5dip"
android:padding="5dip"
android:layout_height="fill_parent"
android:text="Start" />
<Button
android:id="#+id/cancel"
android:textSize="18sp"
android:layout_marginLeft="2dip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Cancel"
android:textColor="#000000" />
</LinearLayout>
</RelativeLayout>

Using View
<View android:layout_height="2px" android:layout_width="fill_parent"
android:background="#android:color/black"
/>

Simply add a ImageView and provide the following attribute,
<ImageView android:layout_width="fill_parent"
android:layout_height="3dip"
android:background="#color/white"
android:padding="5dip"/>
There is nothing like a Divider attribute that you could set for a Layout. Dividers are available for ListView only.
So you might have to change your linear layout like this,
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:orientation="horizontal">
<LinearLayout android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<ImageView android:layout_width="fill_parent"
android:layout_height="3dip"
android:background="#color/white"
android:padding="5dip"/>
</LinearLayout>
<LinearLayout android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="#+id/start"
android:textSize="18sp"
android:layout_marginRight="2dip"
android:layout_width="wrap_content"
android:layout_marginBottom="5dip"
android:padding="5dip"
android:layout_height="fill_parent"
android:text="Start" />
<Button
android:id="#+id/cancel"
android:textSize="18sp"
android:layout_marginLeft="2dip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Cancel"
android:textColor="#000000" />
</LinearLayout>
</LinearLayout>

I just came up something based on Nirav's answer
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="254dp"
android:layout_height="wrap_content"
android:background="#drawable/dialogbox_bg"
android:orientation="vertical" >
<ImageView
android:layout_width="fill_parent"
android:layout_height="50dp"
android:gravity="center"
android:text="#string/selectattachment"
android:textColor="#color/white"
android:textSize="20sp"
android:textStyle="bold" />
<View
android:layout_width="fill_parent"
android:layout_height="2dp"
android:background="#color/blue" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:orientation="horizontal">
<Button
android:id="#+id/start"
android:textSize="18sp"
android:layout_marginRight="2dip"
android:layout_width="wrap_content"
android:layout_marginBottom="5dip"
android:padding="5dip"
android:layout_height="fill_parent"
android:text="Start" />
<Button
android:id="#+id/cancel"
android:textSize="18sp"
android:layout_marginLeft="2dip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Cancel"
android:textColor="#000000" />
</LinearLayout>
</LinearLayout>