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android relative layout issue with button

I have below relative layout:
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="48dp"
android:paddingTop="5dp" >
<View
android:layout_width="match_parent"
android:layout_height="1dip"
android:layout_alignParentTop="true"
android:layout_marginLeft="4dip"
android:layout_marginRight="4dip" />
<View
android:id="#+id/buttonDivider"
android:layout_width="1dip"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="4dip"
android:layout_marginTop="4dip" />
<Button
android:id="#+id/btnOpen"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_toLeftOf="#id/buttonDivider"
android:text="Open" />
<Button
android:id="#+id/btnDelete"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentTop="true"
android:text="Delete" />
<Button
android:id="#+id/btnClose"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_toRightOf="#id/buttonDivider"
android:text="Close" />
</RelativeLayout>
And it generates button like this:
I tried modifying properties, given enough time but can't get it right :(
How can I make it so three buttons appear in sequence while equally occupying width from parent (currently they are not equally distributed as shown in image):
Open Delete Close
Thanks for the help

Do not use relative layout. The solutions is:
Use a horizontal linear layout for the parent layout.
Set android:weightSum="3" for the linear layout.
For each button set android:layout_width="0dp" and android:layout_weight="1". This will distribute them evenly.

You can simply achieve your requirement using LinearLayout with android:layout_weight attribute as follows...
<LinearLayout
android:layout_width="match_parent"
android:layout_height="48dip"
android:orientation="horizontal"
android:paddingTop="5dp"
android:weightSum="3" >
<Button
android:id="#+id/btnOpen"
android:layout_width="0dip"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Open" />
<Button
android:id="#+id/btnDelete"
android:layout_width="0dip"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Delete" />
<Button
android:id="#+id/btnClose"
android:layout_width="0dip"
android:layout_height="match_parent"
android:layout_weight="1"
android:text="Close" />
</LinearLayout>

<RelativeLayout
android:layout_width="match_parent"
android:layout_height="48dp"
android:paddingTop="5dp" >
<View
android:layout_width="match_parent"
android:layout_height="1dip"
android:layout_alignParentTop="true"
android:layout_marginLeft="4dip"
android:layout_marginRight="4dip" />
<View
android:id="#+id/buttonDivider"
android:layout_width="1dip"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="4dip"
android:layout_marginTop="4dip" />
<Button
android:id="#+id/btnOpen"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_toLeftOf="#id/buttonDivider"
android:text="Open" />
<Button
android:id="#+id/btnDelete"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toRightOf="#+id/btnOpen"
android:text="Delete" />
<Button
android:id="#+id/btnClose"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_alignParentBottom="true"
android:layout_toRightOf="#+id/btnDelete"
android:text="Close" />

LinearLayout is much easier to use in such case:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="48dp"
android:paddingTop="5dp">
<Button
android:id="#+id/btnOpen"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Open" />
<Button
android:id="#+id/btnDelete"
android:layout_width="wrap_content"
android:layout_weight="1"
android:layout_height="wrap_content"
android:text="Delete" />
<Button
android:id="#+id/btnClose"
android:layout_weight="1"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="Close" />
</LinearLayout>

Change the code with following 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="48dp"
android:paddingTop="5dp" >
<View
android:layout_width="match_parent"
android:layout_height="1dip"
android:layout_alignParentTop="true"
android:layout_marginLeft="4dip"
android:layout_marginRight="4dip" />
<View
android:id="#+id/buttonDivider"
android:layout_width="1dip"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="4dip"
android:layout_marginTop="4dip" />
<Button
android:id="#+id/btnOpen"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="Open" />
<Button
android:id="#+id/btnDelete"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerInParent="true"
android:text="Delete" />
<Button
android:id="#+id/btnClose"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text="Close" />
</RelativeLayout>

If you want that to be center horizontal or vertical or both give its respective property to the parent relative layout.
Both Center Vertical or Horizontal- android:layout_centerInParent="true"
Horizontal- android:layout_centerHorizontal="true"
Vertical- android:layout_centerVertical="true"

Try this:
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<LinearLayout
android:layout_width="0dp"
android:gravity="center"
android:layout_height="wrap_content"
android:layout_weight="1" >
<Button
android:id="#+id/btnOpen"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Open" />
</LinearLayout>
<LinearLayout
android:layout_width="0dp"
android:gravity="center"
android:layout_height="wrap_content"
android:layout_weight="1" >
<Button
android:id="#+id/btnDelete"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Delete" />
</LinearLayout>
<LinearLayout
android:layout_width="0dp"
android:gravity="center"
android:layout_height="wrap_content"
android:layout_weight="1" >
<Button
android:id="#+id/btnClose"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="Close" />
</LinearLayout>
</LinearLayout>

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>

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>

Make buttons have the same width in layout

I put 4 buttons in a relative layout.
I want them to have the same width, and fix for any screen size of a phone.
My code as below:
<RelativeLayout
android:id="#+id/relativeLayout1"
android:layout_width="match_parent"
android:layout_height="38dp" >
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="Button" />
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toRightOf="#+id/button1"
android:text="Button" />
<Button
android:id="#+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toRightOf="#+id/button2"
android:text="Button" />
<Button
android:id="#+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toRightOf="#+id/button3"
android:text="Button" />
</RelativeLayout>
What should I modify?

Switch to a LinearLayout and give all the buttons equal weight.
for example:
<LinearLayout
android:layout_width="match_parent"
android:layout_height="38dp"
android:orientation="horizontal">
<Button android:layout_weight="1"
android:layout_height="wrap_content"
android:layout_width="match_parent" />
<Button android:layout_weight="1"
android:layout_height="wrap_content"
android:layout_width="match_parent" />
<Button android:layout_weight="1"
android:layout_height="wrap_content"
android:layout_width="match_parent" />
</LinearLayout>