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xml layout not showing background color

Xml layout is showing dark background in graphical layout but not showing it in emulator.Everything was working fine before adding listview to the layout file .
*
this is my layout output after executing
this is my graphical layout
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/relRingtone"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#000000"
>
<ListView
android:focusable="false"
android:id="#+id/list_notification"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:choiceMode="singleChoice"
android:layout_marginLeft="3dip"
android:textSize="2dp" />
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:paddingBottom="40dp" >
<Button
android:id="#+id/btn1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="40dp"
android:background="#drawable/button"
android:padding="5dp"
android:text="Start Working"
android:textColor="#FFF"
android:textSize="20sp"
android:textStyle="bold" />
<Chronometer
android:id="#+id/chronometer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/btn1"
android:layout_centerHorizontal="true"
android:layout_marginTop="30dp"
android:padding="5dp"
android:text="Vehicle Details"
android:textColor="#FFF"
android:textSize="20sp"
android:textStyle="bold"
android:visibility="gone" />
<Button
android:id="#+id/btn2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/chronometer"
android:layout_centerHorizontal="true"
android:layout_marginTop="30dp"
android:background="#drawable/button"
android:padding="5dp"
android:text="Take Leave"
android:textColor="#FFF"
android:textSize="20sp"
android:textStyle="bold" />
</RelativeLayout>
</RelativeLayout>
Xml layout is showing dark background in graphical layout but not showing it in emulator.Everything was working fine before adding listview to the layout file .

Try to give color to the ListView or make it transparent.

Try giving cachecolorhint attribute of the listview and make it transparent like below mentioned snippet:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/relRingtone"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#000000"
>
<ListView
android:focusable="false"
android:id="#+id/list_notification"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:choiceMode="singleChoice"
android:layout_marginLeft="3dip"
android:textSize="2dp"
android:cacheColorHint="#android:color/transparent"/>
/>
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:paddingBottom="40dp" >
<Button
android:id="#+id/btn1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="40dp"
android:padding="5dp"
android:text="Start Working"
android:textColor="#FFF"
android:textSize="20sp"
android:textStyle="bold" />
<Chronometer
android:id="#+id/chronometer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/btn1"
android:layout_centerHorizontal="true"
android:layout_marginTop="30dp"
android:padding="5dp"
android:text="Vehicle Details"
android:textColor="#FFF"
android:textSize="20sp"
android:textStyle="bold"
android:visibility="gone" />
<Button
android:id="#+id/btn2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/chronometer"
android:layout_centerHorizontal="true"
android:layout_marginTop="30dp"
android:padding="5dp"
android:text="Take Leave"
android:textColor="#FFF"
android:textSize="20sp"
android:textStyle="bold" />
</RelativeLayout>
</RelativeLayout>

can you please explain how excatly u want to design ur layout ... as its little bit confusing
But still I've tried to solved from whatever the things i understand from ur question.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/relRingtone"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#000000" >
<ListView
android:id="#+id/list_notification"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_above="#+id/reltivebutton"
android:cacheColorHint="#android:color/transparent"
android:layout_marginLeft="3dip"
android:choiceMode="singleChoice" />
<RelativeLayout
android:id="#+id/reltivebutton"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center" android:layout_alignParentBottom="true"
android:paddingBottom="40dp" >
<Button
android:id="#+id/btn1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="40dp"
android:padding="5dp"
android:text="Start Working"
android:textColor="#FFF"
android:textSize="20sp"
android:textStyle="bold" />
<Chronometer
android:id="#+id/chronometer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/btn1"
android:layout_centerHorizontal="true"
android:layout_marginTop="30dp"
android:padding="5dp"
android:text="Vehicle Details"
android:textColor="#FFF"
android:textSize="20sp"
android:textStyle="bold"
android:visibility="gone" />
<Button
android:id="#+id/btn2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/chronometer"
android:layout_centerHorizontal="true"
android:layout_marginTop="30dp"
android:padding="5dp"
android:text="Take Leave"
android:textColor="#FFF"
android:textSize="20sp"
android:textStyle="bold" />
</RelativeLayout>
</RelativeLayout>

Android: TableLayout Row Not Centering via XML

I'm trying to center a table row using XML in Android, but I'm having a problem where it's over to the right just a smidge too much for two of my rows that only contain two buttons. Here's my code, and I have a screen shot of how it looks
<TableLayout
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">
<TableRow
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center">
<ImageView
android:id="#+id/hiragana_multiple_choice_main_image"
android:gravity="center"
android:layout_width="fill_parent"
android:layout_height="match_parent"/>
</TableRow>
<TableRow
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:padding="30dp">
<Button
android:id="#+id/hiragana_multiple_choice_button_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1" />
<Button
android:id="#+id/hiragana_multiple_choice_button_2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1" />
</TableRow>
<TableRow
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="30dp"
android:gravity="center">
<Button
android:id="#+id/hiragana_multiple_choice_button_3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_weight="1" />
<Button
android:id="#+id/hiragana_multiple_choice_button_4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_weight="1" />
</TableRow>
</TableLayout>
http://www.ptrprograms.com/multiple_choice_offset.png
Thanks!

try to use LinearLayout instead of tablelayout, it will fix it to center and also use fillparent and wrap content for best practice.

Try these Way....
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="65dp"
android:src="#drawable/ic_launcher" />
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="#+id/imageView1"
android:layout_marginTop="59dp"
android:layout_toLeftOf="#+id/imageView1"
android:text="Button" />
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/button1"
android:layout_alignBottom="#+id/button1"
android:layout_alignParentRight="true"
android:layout_toRightOf="#+id/imageView1"
android:text="Button" />
<Button
android:id="#+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignRight="#+id/button1"
android:layout_below="#+id/button1"
android:layout_marginTop="68dp"
android:text="Button" />
<Button
android:id="#+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/button3"
android:layout_alignBottom="#+id/button3"
android:layout_alignLeft="#+id/button2"
android:layout_alignParentRight="true"
android:text="Button" />
</RelativeLayout>

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>

Arranging elements in a Relative Layout

I have been trying to find the best way to do this for a while. What I want is something like this:
With the code:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true" >
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.5"
android:text="Button" />
<Button
android:id="#+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.5"
android:text="Button" />
</LinearLayout>
<ProgressBar
android:id="#+id/progressBar1"
style="?android:attr/progressBarStyleLarge"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true" />
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/progressBar1"
android:layout_centerHorizontal="true"
android:layout_marginTop="50dp"
android:text="Button" />
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="49dp"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/progressBar1"
android:layout_centerHorizontal="true"
android:layout_marginBottom="52dp"
android:text="TextView" />
I've got this layout:
The problem here is the margins are fixed amount of dpi. I'd like to get some sort of fluidity to this.
The way I would like this:
Space above progress bar is separated in 3 equal parts, above the
first text, between the 1st and the 2nd texts and between the second
text and progress bar
Indeterminate progress bar - centered in the middle both vertically and horizontally.
Space below progress bar is separated in 2 equal parts - between the progress bar and the button and between the button and the bottom
linear-layout.
Is there a way to do this relatively? I'd prefer doing it in a layout
file, but I could also go for programming and spacing programmaticaly.

Here is a rough layout with RelativeLayout:
<RelativeLayout>
<TextView
android:id="#+id/textView1"
android:layout_above="#+id/textView2" />
<TextView
android:id="#+id/textView2"
android:layout_above="#+id/progressBar1" />
<ProgressBar
android:id="#+id/progressBar1" />
<Button
android:id="#+id/button1"
android:layout_below="#+id/progressBar1" />
<TableRow
android:layout_below="#+id/button1"
android:weightSum="1.0">
<Button
android:layout_weight="0.5" />
<Button
android:layout_weight="0.5" />
</TableRow>
</RelativeLayout>
NOTE: With reference to ProgressBar in center you can arrange the upper and bottom layout.

<?xml version="1.0" encoding="utf-8"?>
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="1"
android:gravity="center"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="1"
android:gravity="center"
android:text="TextView" />
<LinearLayout
android:id="#+id/pb"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:gravity="center" >
<ProgressBar
android:id="#+id/progressBar1"
style="?android:attr/progressBarStyleLarge"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
<LinearLayout
android:id="#+id/b1"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:gravity="center" >
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
</LinearLayout>
<LinearLayout
android:id="#+id/b2"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:gravity="center" >
<Button
android:id="#+id/button2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Button" />
<Button
android:id="#+id/button3"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Button" />
</LinearLayout>

You could try this:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:id="#+id/btn_bar"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true" >
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.5"
android:text="Button" />
<Button
android:id="#+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.5"
android:text="Button" />
</LinearLayout>
<ProgressBar
android:id="#+id/progressBar1"
style="?android:attr/progressBarStyleLarge"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true" />
<RelativeLayout
android:id="#+id/btn_wrapper"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_above="#id/btn_bar"
android:layout_below="#id/progressBar1" >
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="Button" />
</RelativeLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_above="#id/progressBar1"
android:layout_alignParentTop="true"
android:gravity="center_horizontal"
android:orientation="vertical" >
<View
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="1" />
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
<View
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="1" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0"
android:text="TextView" />
<View
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="1" />
</LinearLayout>
</RelativeLayout>

How to manage Layout In android

I had just started working on android. Actually I had created a calculator application.
The problem I have faced is to manage the layout. I have two rows of buttons. In each row are 4 buttons. When I run the application the space between the first row and the second row is quite large. So can anyone tell me how can I decrease the space between these two rows?
The code I have written:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1">
<TextView
android:id="#+id/label"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Calculator Application"/>
<EditText
android:id="#+id/entry"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#android:drawable/editbox_background"
android:layout_below="#id/label"/>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1">
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1">
<Button
android:id="#+id/one"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginLeft="10dip"
android:text="1" />
<Button
android:id="#+id/two"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginLeft="10dip"
android:text="2" />
<Button
android:id="#+id/three"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginLeft="10dip"
android:text="3" />
<Button
android:id="#+id/plus"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginLeft="10dip"
android:text="+" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1">
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1">
<Button
android:id="#+id/four"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginLeft="10dip"
android:text="4" />
<Button
android:id="#+id/five"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginLeft="10dip"
android:text="5" />
<Button
android:id="#+id/six"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginLeft="10dip"
android:text="6" />
<Button
android:id="#+id/minus"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginLeft="10dip"
android:text="-" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1">
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1">
<Button
android:id="#+id/seven"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginLeft="10dip"
android:text="7" />
<Button
android:id="#+id/eight"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginLeft="10dip"
android:text="8" />
<Button
android:id="#+id/nine"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginLeft="10dip"
android:text="9" />
<Button
android:id="#+id/multiply"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginLeft="10dip"
android:text="*" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1">
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1">
<Button
android:id="#+id/zero"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginLeft="10dip"
android:text="0" />
<Button
android:id="#+id/clr"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginLeft="10dip"
android:text="c" />
<Button
android:id="#+id/equal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginLeft="10dip"
android:text="=" />
<Button
android:id="#+id/divide"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginLeft="10dip"
android:text="/" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
</LinearLayout>
Regards
Anshuman

Replace all of the
android:layout_height="fill_parent" calls to
android:layout_height="wrap_content"
(apart from the parent layout, which should be fill_parent)
I have verified that this works.
EDIT: To make the buttons fill the screen horizontally, (and all be equally sized), add this to each button:
android:layout_width="0dp"
android:layout_weight="1"

the better way is u can use grid layout.try this links
http://www.edumobile.org/android/android-beginner-tutorials/draw-menu-in-grid-view/
http://www.firstdroid.com/2011/02/06/android-tutorial-gridview-with-icon-and-text/

As CaspNZ suggested use android:layout_height="wrap_content" also using top padding may help.