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Layouts not scaling properly

I have 7 image buttons I am displaying and while editing the xml the preview looks perfect, however when I launch the app in an emulator it doesn't seem to scale and is cutting off the images.
It should look like this:
-0-0-
0-0-0
-0-0-
Where the '0's are the buttons. I have it setup for one overall relative layout and three linear layouts. The middle places first then the top and bottom align off the middle.
Here is my XML file
<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"
android:orientation="horizontal"
android:id="#+id/activity_color_wheel">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:id="#+id/middle_left">
<ImageButton
android:id="#+id/dode1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/dodecagon1"
android:onClick="selected"
android:background="?android:attr/selectableItemBackground" />
<ImageButton
android:id="#+id/dode2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/dodecagon2"
android:onClick="selected"
android:background="?android:attr/selectableItemBackground"
/>
<ImageButton
android:id="#+id/dode3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/dodecagon3"
android:onClick="selected"
android:background="?android:attr/selectableItemBackground" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/middle_left"
android:layout_centerInParent="true"
android:id="#+id/bottom">
<ImageButton
android:id="#+id/dode4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/dodecagon4"
android:onClick="selected"
android:background="?android:attr/selectableItemBackground"/>
<ImageButton
android:id="#+id/dode5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/dodecagon5"
android:onClick="selected"
android:background="?android:attr/selectableItemBackground"/>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/middle_left"
android:layout_centerInParent="true"
android:id="#+id/top">
<ImageButton
android:id="#+id/dode6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/dodecagon6"
android:onClick="selected"
android:background="?android:attr/selectableItemBackground"/>
<ImageButton
android:id="#+id/dode7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/dodecagon7"
android:onClick="selected"
android:background="?android:attr/selectableItemBackground"/>
</LinearLayout>
<TextView
android:id="#+id/textView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="10dp"
android:gravity="center_horizontal"
android:textSize="25dp" />
</RelativeLayout>
Basically the top and bottom layouts get cut off near the bottom. I figure i'm missing some kind of scaling property, but i'm not sure.

All of your views' width and height are "wrap content".
In that case if the total images width/height is greater then the screen's width/height it will just cut off.
what you should do is:
1) set the LinearLayouts width to "match parent".
2) set weight to the children views as you wish.
3) set children width to 0dp for better performance.
Example code snippet:
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_centerInParent="true"
android:id="#+id/middle_left">
<ImageButton
android:id="#+id/dode1"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:src="#drawable/testImage"
android:onClick="selected"
android:background="?android:attr/selectableItemBackground" />
<ImageButton
android:layout_weight="1"
android:id="#+id/dode2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:src="#drawable/testImage"
android:onClick="selected"
android:background="?android:attr/selectableItemBackground"
/>
<ImageButton
android:layout_weight="1"
android:id="#+id/dode3"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:src="#drawable/testImage"
android:onClick="selected"
android:background="?android:attr/selectableItemBackground" />
</LinearLayout>
Good luck.

If your problem is only with the top and bottom images, then you only need to add a ScrollView as a parent to your RelativeLayout.

aligning Image Buttons with TextView XML

How do i align the arrows to be right above/below the numbers? Does each arrow need to have it's own linear layout? Is there a way to set this without setting a static amount of padding? I would like this to be generic enough to be used and show up properly on different devices...
I'm relatively new to android development - especially the UI portion of it... so any help would be appreciated!
What I See (Above)
What I Would Like To See (Above)

You can nest another LinearLayout (with orientation:vertical) inside your LinearLayout (with orientation:horizontal).
<?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"
android:orientation="horizontal" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:orientation="vertical" >
<ImageButton
android:id="#+id/number_picker_up_one"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/up"
android:background="#drawable/up" />
<TextView
android:id="#+id/one"
android:text="100"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#color/OffWhite"
android:textSize="40sp"
/>
<ImageButton
android:id="#+id/number_picker_down_one"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/down"
android:background="#drawable/down" />
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:orientation="vertical" >
<ImageButton
android:id="#+id/number_picker_up_two"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/up"
android:background="#drawable/up" />
<TextView
android:id="#+id/two"
android:text="100"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#color/OffWhite"
android:textSize="40sp"
/>
<ImageButton
android:id="#+id/number_picker_down_two"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/down"
android:background="#drawable/down" />
</LinearLayout>
</LinearLayout>
Note that nesting too many layouts inside a layout is discouraged. Reference:
http://developer.android.com/training/improving-layouts/optimizing-layout.html
But having 2 layout hierarchy is totally fine.

You need to nest two vertical LinearLayouts inside of your horizontal LinearLayout. Here's one where I do the same thing but I have empty Views on each side and one in the middle. You can take those out if you don't want them and obviously change your ids, backgrounds, and such
<LinearLayout
android:id="#+id/mpImage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_margin="10dp">
<View
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight=".5"/>
<LinearLayout
android:id="#+id/mpLL"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="4"
android:layout_gravity="left"
android:orientation="vertical">
<ImageButton
android:id="#+id/mpUpBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
style="#style/UpArrow"
android:onClick="cycleUp"/>
<TextView
android:id="#+id/mpTV"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="breakfast"
android:gravity="center"
android:layout_gravity="center"
android:textSize="40sp"
android:textColor="#drawable/black"/>
<ImageButton
android:id="#+id/mpDownBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:onClick="cycleDown"
style="#style/DownArrow"/>
</LinearLayout>
<View
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight=".5"/>
<LinearLayout
android:id="#+id/catLL"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="4"
android:layout_gravity="left"
android:orientation="vertical">
<ImageButton
android:id="#+id/catUpBtn"
style="#style/UpArrow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:onClick="cycleUp" />
<TextView
android:id="#+id/catTV"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Beef"
android:gravity="center"
android:layout_gravity="center"
android:textSize="40sp"
android:textColor="#drawable/black" />
<ImageButton
android:id="#+id/catDownBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:onClick="cycleDown"
style="#style/DownArrow" />
</LinearLayout>
<View
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight=".5"/>
</LinearLayout>
You will notice I have also used weight and a 0dp for the width of the nested LinearLayouts and for the View to give them the separation I wanted and to look right on different screen sizes. You can change those depending on your needs.

You can have nested layouts. Be careful not to have too many, however two should be fine. Here is an example of what I think you are looking for. The arrows and text should be aligned thanks to RelativeLayout.
<?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"
android:orientation="horizontal" >
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical" >
<ImageButton
android:id="#+id/number_picker_up_one"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:background="#drawable/up"
android:src="#drawable/up" />
<TextView
android:id="#+id/one"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/number_picker_up_one"
android:text="100"
android:textColor="#color/OffWhite"
android:textSize="40sp" />
<ImageButton
android:id="#+id/number_picker_down_one"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/one"
android:layout_centerHorizontal="true"
android:background="#drawable/down"
android:src="#drawable/down" />
</RelativeLayout>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical" >
<ImageButton
android:id="#+id/number_picker_up_two"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:background="#drawable/up"
android:src="#drawable/up" />
<TextView
android:id="#+id/two"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/number_picker_up_two"
android:text="100"
android:textColor="#color/OffWhite"
android:textSize="40sp" />
<ImageButton
android:id="#+id/number_picker_down_two"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/two"
android:layout_centerHorizontal="true"
android:background="#drawable/down"
android:src="#drawable/down" />
</RelativeLayout>
</LinearLayout>

Unable To Center Objects Within Two Relative Layouts

I'm attempting to split the UI for my horizontal layout into two halves each with it's own realative layout so I am able to center text and graphics within the two left and right halves of the screen. The problem is when I attmept to do so - the go button still ends up in the middle of the screen instead of centered on the right hand of the screen.
(If I can figure out how to center correctly I'm sure I'll be able to apply the same technique to the other elements to achieve the result I desire.
SOURCE:
<?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"
android:layout_marginBottom="8sp"
android:layout_marginLeft="8sp"
android:layout_marginRight="8sp"
android:layout_marginTop="8sp"
android:background="#drawable/background"
android:orientation="vertical" >
<RelativeLayout
android:id="#+id/start"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<ImageView
android:id="#+id/emblem"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:layout_marginTop="24dp"
android:gravity="center"
android:scaleType="fitStart"
android:src="#drawable/apn_app_logo" />
</RelativeLayout>
<RelativeLayout
android:id="#+id/start2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true" >
<TextView
android:id="#+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_below="#+id/go_button"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:gravity="center"
android:text="#string/start_text2"
android:textColor="#000000"
android:textSize="18sp" />
<Button
android:id="#+id/go_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:background="#drawable/apn_app_go_button" />
</RelativeLayout>
</RelativeLayout>
EDIT: (in response to Kuba's answer)
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="horizontal"
tools:context=".MainActivity" >
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="#drawable/background"
android:gravity="center"
android:orientation="horizontal" >
<ImageView
android:id="#+id/emblem"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginTop="24dp"
android:gravity="center"
android:scaleType="fitStart"
android:src="#drawable/apn_app_logo" />
</LinearLayout>
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="#drawable/background"
android:gravity="center_horizontal"
android:orientation="horizontal" >
<Button
android:id="#+id/go_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/apn_app_go_button"
android:gravity="center_horizontal" />
<TextView
android:id="#+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:text="#string/start_text2"
android:textColor="#000000"
android:textSize="18sp" />
</LinearLayout>
</LinearLayout>

Instead of Relative layout, I would recommend using LinearLayout.
<LinearLayout 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"
android:orientation="horizontal"
tools:context=".MainActivity" >
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="horizontal"
android:background="#00dd00"
android:gravity="center"
>
<Button
android:text="Button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</LinearLayout>
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="horizontal"
android:background="#dd0000"
android:gravity="center_horizontal"
>
<Button
android:text="Button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</LinearLayout>
</LinearLayout>
In the inner LinearLayout you can either use android:gravity="center" to have its children centered vertically and horizontally. Or use use android:gravity="center_horizontal" to center in only horizontal way.
EDIT: Added the textview, which was discussed in the comments.
To have the textView appear underneath the button, you must change the orientation of the LinearLayout from horizontal to vertical. Please see the developer site .
The inner LinearLayout thus looks like this.
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="vertical"
android:background="#dd0000"
android:gravity="center"
>
<Button
android:text="Button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="text here"
/>
</LinearLayout>
How can I use android:layout_below="#+id/go_button" in a linear layout?
You can't. These relationships only work in relative layout where you place views in relation to each other or the parent view. In linear layout items are stacked either vertically or horizontally.

Set android:gravity="center" in
<Button
android:id="#+id/go_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:background="#drawable/apn_app_go_button" />
Maybe its work.

Need assistance with Android fixed footer for a linear layout

I have <.ImageView>enter code heres(icons) in my android layout xml file, which are encompassed by a <ScrollView>.
Eg.
<.ScrollView><br>
<.LinearLayout><br>
<.ImageView> ...<./ImageView><br>
<./LinearLayout><br>
<./ScrollView>
To this layout, i want to attach a fixed footer. Basically a small tab present on the bottom on the screen which stays even when I scroll to the all the way down or all the way to the top.

I tend to write up layouts like this with a LinearLayout as root element and weights on the children to dynamically allocate screen estate. It keeps the layout definition compact and doesn't require defining extra ids.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ScrollView
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<ImageView ... />
<ImageView ... />
...
<ImageView ... />
</LinearLayout>
</ScrollView>
<!-- footer here -->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
...
</LinearLayout>
</LinearLayout>
Using a RelativeLayout as root element, with the ScrollView positioned 'above' the bottom-aligned footer, however, is probably slightly better in terms of performance, although I doubt it'll make a noticable different in the case of a simple view hierarchy like this. The RelativeLayout approach does require assigning some ids (to at least the footer, I'd say).

something like this..
<.ScrollView>
<.LinearLayout>
<.ImageView> ...<./ImageView>
<./LinearLayout>
<./ScrollView>
<LinearLayout>
<-- your footer here -->
</LinearLayout>

U can try like this also..
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/relativeLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<ScrollView
android:id="#+id/scrollView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<LinearLayout
android:id="#+id/linearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_launcher" />
<ImageView
android:id="#+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_launcher" />
<ImageView
android:id="#+id/imageView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_launcher" />
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_launcher" />
<ImageView
android:id="#+id/imageView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_launcher" />
<ImageView
android:id="#+id/imageView5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_launcher" />
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_launcher" />
<ImageView
android:id="#+id/imageView6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_launcher" />
<ImageView
android:id="#+id/imageView7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_launcher" />
<ImageView
android:id="#+id/imageView14"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_launcher" />
<ImageView
android:id="#+id/imageView11"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_launcher" />
<ImageView
android:id="#+id/imageView8"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_launcher" />
<ImageView
android:id="#+id/imageView12"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_launcher" />
<ImageView
android:id="#+id/imageView9"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_launcher" />
</LinearLayout>
</ScrollView>
<RelativeLayout
android:id="#+id/relativeLayout2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#drawable/blackbg"
android:layout_alignParentBottom="true" >
<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" />
</RelativeLayout>
</RelativeLayout>

Android ImageButton in different screens

In the UI for my application I have 5 ImageButton all is ok on the 3.7" screen but if I have a screen of 2.7", 3.0" or other my UI will not scale and it looks bad. It looks like this:
3,7"
2,7"
How do I make all have a nice look on all screens, just like on the screen 3.7"?
Code: main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/Background"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#drawable/two"
android:orientation="vertical" >
<LinearLayout
android:id="#+id/LL"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="150dp"
android:orientation="vertical"
android:scaleType="fitXY" >
<ImageButton
android:id="#+id/ibTest1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:background="#drawable/one" />
<ImageButton
android:id="#+id/ibTest2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:background="#drawable/one" />
<ImageButton
android:id="#+id/ibTest3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:background="#drawable/one" />
<ImageButton
android:id="#+id/ibTest4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:background="#drawable/one" />
<ImageButton
android:id="#+id/ibTest5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:background="#drawable/one" />
</LinearLayout>
</RelativeLayout>

Use a RelativeLayout, and then place a LinearLayout with height wrap_content and put the buttons inside that LinearLayout. Also use dp instead of px for sizes.
P.S. If you post the code of your layout, we can help you better.
EDITED: Now that I can see your code I can show you want I meant with my answer:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/Background"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#drawable/two"
android:orientation="vertical" >
<LinearLayout
android:id="#+id/LL"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:orientation="vertical"
android:gravity="center"
android:layout_centerInParent="true" >
<ImageButton
android:id="#+id/ibTest1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/one" />
<ImageButton
android:id="#+id/ibTest2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/one" />
<ImageButton
android:id="#+id/ibTest3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/one" />
<ImageButton
android:id="#+id/ibTest4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/one" />
<ImageButton
android:id="#+id/ibTest5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/one" />
</LinearLayout>
</RelativeLayout>

Can you provide some code?
Maybe try add to in xml
android:scaleType="fitXY"

First make image for all
mdpi,hdpi,ldpi
as per their size.
take Lineatlayout in center for Buttons only.
then set property gravity="Center" ;

Make sure your are using dp insted of using 'px'..Its a common cause.

try this add in each imageview in xml
android:adjustViewBounds="true"
android:scaleType="centerCrop"