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Design layout display is not the same

How to edit xml file layout. All display screen is the same.
screen size 4.7", 5.0" display accuracy. But screen other than this. Display Distortion. Except screen tablet.
Help me fix it.
screen_main.xml
<FrameLayout 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="jp.vertice.test.MainScreenFragment">
<!-- TODO: Update blank fragment layout -->
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#51c8fc">
<ImageView
android:layout_width="200dp"
android:layout_height="195dp"
android:id="#+id/imageView2"
android:src="#mipmap/ic_launcher"
android:background="#fc0c0c"
android:layout_marginLeft="18dp"
android:layout_marginStart="18dp"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<ImageButton
android:layout_width="100dp"
android:layout_height="100dp"
android:id="#+id/btn1"
android:layout_alignParentTop="true"
android:layout_alignLeft="#+id/btn3"
android:layout_alignStart="#+id/btn3" />
<ImageButton
android:layout_width="100dp"
android:layout_height="100dp"
android:id="#+id/btn2"
android:layout_below="#+id/btn1"
android:layout_alignLeft="#+id/btn1"
android:layout_alignStart="#+id/btn1" />
<ImageButton
android:layout_width="100dp"
android:layout_height="100dp"
android:id="#+id/btn5"
android:layout_below="#+id/btn2"
android:layout_alignLeft="#+id/imageView2"
android:layout_alignStart="#+id/imageView2"
android:layout_marginTop="5dp" />
<ImageButton
android:layout_width="100dp"
android:layout_height="100dp"
android:id="#+id/btn4"
android:layout_alignTop="#+id/btn5"
android:layout_toRightOf="#+id/btn5"
android:layout_toEndOf="#+id/btn5"
android:layout_marginLeft="9dp"
android:layout_marginStart="9dp" />
<ImageButton
android:layout_width="100dp"
android:layout_height="100dp"
android:id="#+id/btn3"
android:layout_alignTop="#+id/btn4"
android:layout_toRightOf="#+id/btn4"
android:layout_toEndOf="#+id/btn4"
android:layout_marginLeft="10dp"
android:layout_marginStart="10dp" />
</RelativeLayout>
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="205dp"
android:background="#F4F4F4"
android:layout_gravity="bottom">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="YYYY.MM.DD"
android:id="#+id/txt1"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginLeft="22dp"
android:layout_marginStart="22dp"
android:layout_marginBottom="173dp" />
<TextView
android:layout_width="230dp"
android:layout_height="50dp"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
android:id="#+id/text2"
android:layout_alignTop="#+id/txt1"
android:layout_alignLeft="#+id/txt1"
android:layout_alignStart="#+id/txt1"
android:layout_marginTop="25dp" />
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="BUTTON"
android:id="#+id/btn6"
android:layout_marginLeft="11dp"
android:layout_marginStart="11dp"
android:layout_alignTop="#+id/text2"
android:layout_toRightOf="#+id/text2"
android:layout_toEndOf="#+id/text2" />
<TextView
android:layout_width="fill_parent"
android:layout_height="20dp"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="FOOTER"
android:id="#+id/textView2"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:textSize="10sp"
android:textStyle="bold"
android:textAlignment="center"
android:gravity="center_vertical"
android:background="#FFFFFF" />
</RelativeLayout>
</FrameLayout>

Don't use Frame Layout here because Frame Layout used to show single view.

I see you are using fixed dp values for layout_width and layout_height.
dp means density independent pixel. It is not a size independent pixel.
The dp makes sure your layout looks the same on devices with the same size, but different pixel density. It will not look the same on bigger devices.
If you want it to scale to larger devices you will have to use match_parent and wrap_content.
Use the power of the relative layout to place items on the right side of the screen also.
You can also make separate layout files for differently sized devices. So you can customise it depending on the size.
You do this by making a new layout folder named for example layout-sw600dp/ (or any number you want) which will only be used on devices that have at least the width you specified (so 600dp in this example).
Make sure your layout file has the same name in this folder as in the normal folder.
You can find very useful information about this in the documentation:
here and here.

You can try using a GridLayout. This way, the image columns will fill the whole screen.

you can't work with dp and expect the same result on different
if you want same display for all the devices you can work with weightSum and weight here is a little example
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="2">
<LinearLayout
android:id="#+id/layout1"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
<LinearLayout
android:id="#+id/layout2"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
</LinearLayout>

How to implement correct UI for several screens in android

Here i am trying to handle different screens ,These are several screens i am trying to handle ,Here if i adjust for one screen remaining screens getting error ,not getting what is problem
here is
Here is my 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"
android:background="#drawable/transactionpagebg" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="160dp"
android:gravity="center"
android:paddingLeft="50dp"
android:text="Current Meter Reading"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="#android:color/white" />
<LinearLayout
android:id="#+id/linearLayout1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:gravity="center"
android:orientation="horizontal" >
<EditText
android:id="#+id/editText1"
android:layout_width="130dp"
android:layout_height="wrap_content"
android:inputType="number" />
<Spinner
android:id="#+id/spinner1"
android:layout_width="150dp"
android:layout_height="50dp" />
</LinearLayout>
<AbsoluteLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<Button
android:id="#+id/saveButton"
android:layout_width="113px"
android:layout_height="wrap_content"
android:layout_x="61dp"
android:layout_y="330dp"
android:background="#drawable/savebutton" />
<Button
android:id="#+id/settingsButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_x="208dp"
android:layout_y="330dp"
android:background="#drawable/settingbutton" />
</AbsoluteLayout>
</RelativeLayout>

to do as it need to be, you need to have support for different screen sizes you need to have different layouts, and also some changes in your manifest file...
check this question How to support different screen size in android
and this link http://developer.android.com/guide/practices/screens_support.html

There are many ways to make each view look right on various screens. However, I have found two methods are working best for me (at the moment):
To get the views to dynamically set their screen positions, wrap the widgets in a LinearLayout (LL), and put those LLs in a single LL. Set the weight of the inner LL to 1, and they will space themselves equally within the parent LL. This works for horizontal and vertical layouts. The distance between the widgets gets adjusted automatically by the OS.
create different dimens.xml folders/files for the different screen sizes (small, medium, large) and further differentiate them by density of needed (mdpi, hdpi, xhdpi, etc.). This way you can set margins, paddings, font sizes, for each size/density to get what you want.
EDIT: I see you put "TRANSACTION" in the background drawable? You can't do that! You need to create an image with just the text, and put it in an ImageView at the top of the layout. That way, you can set its position and size as needed for different screens, and make the other widgets adjust their positions relative to that image.
Even better would be to find a free font (ttf file) you can use that matches what you want, and put it in a TextView.
Here is a quick example of your layout with the ideas I mentioned. You would put the margins and font sizes in a dimens.xml file, so that you can adjust them.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#0000ee"
android:orientation="vertical" >
<LinearLayout
android:id="#+id/hh"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="36dp"
android:orientation="vertical" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginBottom="36dp"
android:text="TRANSACTION"
android:textColor="#ffffff"
android:textSize="28sp" />
<TextView
android:id="#+id/test_textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:text="Current Meter Reading"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="#android:color/white" />
</LinearLayout>
<LinearLayout
android:id="#+id/test_linearLayout1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_weight="1"
android:gravity="center"
android:orientation="horizontal" >
<EditText
android:id="#+id/test_editText1"
android:layout_width="130dp"
android:layout_height="wrap_content"
android:layout_marginRight="24dp"
android:background="#ffffff"
android:inputType="number" />
<Spinner
android:id="#+id/test_spinner1"
android:layout_width="150dp"
android:layout_height="50dp"
android:background="#999999" />
</LinearLayout>
<LinearLayout
android:id="#+id/LinearLayout1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_weight="1" >
<Button
android:id="#+id/test_saveButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="24dp"
android:text="Save" />
<Button
android:id="#+id/test_settingsButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
</LinearLayout>

Same position for UI elements (buttons, image buttons) on all android devices

My application uses buttons and image buttons constructed via XML and drawable folder.
On some devices applications UI elements (buttons and image buttons) losses its position and overlaps on each other and on some devices last button in bottom of screen disappears.
Same is happening when orientation is changed.
I want all my elements to be on same position on all devices.
How can I make this using XML.
Is there any easy and simple way to do so?
Here is my XML.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#drawable/bg"
android:orientation="vertical" >
<ImageButton
android:id="#+id/main_btn_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="55dp"
android:layout_marginTop="71dp"
android:background="#ffffff"
/>
<ImageButton
android:id="#+id/main_btn_2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignTop="#+id/main_btn_1"
android:layout_marginRight="56dp"
android:background="#000000"
/>
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/main_btn_1"
android:layout_below="#+id/main_btn_1"
android:textColor="#00aeed"
android:textStyle="normal" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/textView1"
android:layout_alignBottom="#+id/textView1"
android:layout_alignLeft="#+id/main_btn_2"
android:textColor="#ea1d24"
android:textStyle="normal" />
<ImageButton
android:id="#+id/main_btn_3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/textView1"
android:layout_below="#+id/textView1"
android:layout_marginTop="42dp"
android:background="#000000"
/>
<TextView
android:id="#+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/main_btn_3"
android:layout_below="#+id/main_btn_3"
android:textColor="#f7941d"
android:textStyle="normal" />
<ImageButton
android:id="#+id/main_btn_4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/textView2"
android:layout_alignTop="#+id/main_btn_3"
android:background="#000000"
/>
<TextView
android:id="#+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/main_btn_4"
android:layout_below="#+id/main_btn_4"
android:textColor="#f7941d"
android:textStyle="normal" />
<ImageButton
android:id="#+id/main_btn_5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/textView4"
android:layout_centerHorizontal="true"
android:layout_marginTop="12dp"
android:background="#000000"
/>
<TextView
android:id="#+id/textView5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/main_btn_5"
android:layout_centerHorizontal="true"
android:gravity="center_horizontal"
android:textColor="#0065b3"
android:textStyle="normal" />
</RelativeLayout>

Because there are many devices with so many different screen sizes, resolutions, etc., probably the main thing you have to avoid is using absolute positions when placing layout elements. The Android SDK has some powerful structures to avoid absolute positioning (i.e. LinearLayout, RelativeLayout), so try working with them and instead of defining positions like "12dp", use the correct combination of layout_width, layout_height (wrap_content or match_parent) and layout_weight, which can help you to place layout elements without specifying absolute positions.

android layouts - using ImageView

I want to create the following layout -
http://postimg.org/image/56e9y0hrj/
But when I use the Relative layout and write the following code, I get something like this.
http://postimg.org/image/4gm0r15k1/
Here is mt 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:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:background="#5c575c"
tools:context=".MainActivity" >
<TextView
android:id="#+id/textView1"
android:layout_marginTop="2dip"
android:layout_marginBottom="2dip"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="Top Stories"
android:background="#ccc6ba"
style="#style/format"
android:textAppearance="?android:attr/textAppearanceLarge" />
<ImageView
android:id="#+id/imageView1"
android:layout_width="120dip"
android:layout_height="160dip"
android:layout_alignLeft="#+id/textView1"
android:layout_alignTop="#+id/textView1"
android:src="#drawable/one" />
<ImageView
android:id="#+id/imageView2"
android:layout_width="120dip"
android:layout_height="160dip"
android:layout_alignParentRight="true"
android:layout_alignTop="#+id/imageView1"
android:src="#drawable/two" />
<TextView
android:id="#+id/textView2"
style="#style/format_text"
android:background="#ccc6ba"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/imageView1"
android:layout_alignLeft="#+id/imageView1"
android:text="A sample widget for multiple lines"
android:layout_alignRight="#id/imageView1"
android:textAppearance="?android:attr/textAppearanceSmall" />
<TextView
android:id="#+id/textView3"
style="#style/format_text"
android:background="#ccc6ba"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/textView2"
android:layout_alignBottom="#+id/textView2"
android:layout_alignLeft="#+id/imageView2"
android:text="A sample widget for multiple lines"
android:textAppearance="?android:attr/textAppearanceSmall" />
<TextView
android:id="#+id/textView4"
android:layout_marginTop="10dip"
android:layout_marginBottom="2dip"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="#id/textView2"
android:text="World"
android:background="#ccc6ba"
style="#style/format"
android:textAppearance="?android:attr/textAppearanceLarge" />
<ImageView
android:id="#+id/imageView3"
android:layout_width="120dip"
android:layout_height="160dip"
android:layout_alignLeft="#+id/textView4"
android:layout_alignTop="#+id/textView4"
android:src="#drawable/three" />
<ImageView
android:id="#+id/imageView4"
android:layout_width="120dip"
android:layout_height="160dip"
android:layout_alignParentRight="true"
android:layout_alignTop="#+id/imageView3"
android:src="#drawable/four" />
<TextView
android:id="#+id/textView5"
style="#style/format_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/imageView3"
android:layout_alignLeft="#+id/imageView3"
android:layout_alignRight="#+id/imageView3"
android:background="#ccc6ba"
android:text="A sample widget for multiple lines"
android:textAppearance="?android:attr/textAppearanceSmall" />
<TextView
android:id="#+id/textView6"
style="#style/format_text"
android:background="#ccc6ba"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/textView5"
android:layout_alignBottom="#+id/textView5"
android:layout_alignLeft="#+id/imageView4"
android:text="A sample widget for multiple lines"
android:textAppearance="?android:attr/textAppearanceSmall" />
<TextView
android:id="#+id/textView7"
android:layout_marginTop="10dip"
android:layout_marginBottom="2dip"
style="#style/format"
android:background="#ccc6ba"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/imageView3"
android:layout_below="#+id/imageView3"
android:text="Cricket"
android:textAppearance="?android:attr/textAppearanceLarge" />
</RelativeLayout>
I have gone through http://android-developers.blogspot.in/2009/02/android-layout-tricks-1.html and http://www.mkyong.com/android/android-relativelayout-example/ but could not find the solution. The images I use are of dimention 400by300 generated by http://dummyimage.com/
Please help me out !

Possible layout workaround, just from scratch, should show only my idea and is not testet: Do two LinearLayouts which specify layout_weight="1" inside one parent LinearLayout. This segments both LinearLayouts inside to the same size. Inside these two LinearLayouts, set the imageView and textView. But also, here You have to do different layout.xml for multiple screen usage.
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_weight="1">
<ImageView
android:id="#+id/imageView1"
android:layout_width="match_parent"
android:layout_height="160dp"
android:scaleType="center"
android:src="#drawable/one"
/>
<TextView
android:id="#+id/textView2"
style="#style/format_text"
android:background="#ccc6ba"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="A sample widget for multiple lines"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_weight="1">
<ImageView
android:id="#+id/imageView2"
android:layout_width="match_parent"
android:layout_height="160dp"
android:scaleType="center"
android:src="#drawable/two"
/>
<TextView
android:id="#+id/textView3"
style="#style/format_text"
android:background="#ccc6ba"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="A sample widget for multiple lines""/>
</LinearLayout>
</LinearLayout>
And then, You have define some new layout folders inside res-folder in your project. You need folders for different sizes. Inside these folder you have to define a layout file where the image views got different heights to match to the related screen size. But this is beyond the frame, so You have to learn a little bit about using multiple screen sizes:
http://developer.android.com/guide/practices/screens_support.html
using Fragments is even possible:
http://developer.android.com/guide/components/fragments.html
http://www.vogella.com/articles/AndroidFragments/article.html
EDIT
This behaviour of your textvies is because of the different screen sizes. That´s what I had talking about, to get all looking good, You have to do more than only one layout. Here are some examples how one layout looks on different screens:
HTC Desire S 3.7 inches
the imageViews and TextViews fill the whole width, so the textViews are completely as width as the imageViews. By default, the textView wraps automatically if the text is too long, but this could be device dependant. Usally define maxLines, that will cause wrap text inside the textView. But if the text is shorter than the width, it doesn´t wrap.
Device with 5.1 inches
here the text is shorter than the width, so it doesn´t wrap. You could fix this by set fixed sizes to textView.
But this is all just scratches the subject, I can´t complain the whole thing in here. You have to learn how to handle different layouts. You have to set fixed sizes to different layouts, different resources and so on.

Adjusting the size of an ImageButton in Android

Is there any way to do this? I have tried padding the image and setting the width/height of the view, but neither seems to work. Here is an example:
<ImageButton
android:id="#+id/search"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/search_small"
android:paddingTop="4sp"
android:paddingBottom="4sp"
android:paddingLeft="6sp"
android:paddingRight="6sp"
android:layout_marginRight="10sp"
android:layout_marginTop="6sp"
android:layout_marginBottom="6sp"
android:layout_alignParentRight="true"
/>
I want the button to be wider than it is tall, but it is coming out the other way round.

Just had a play to try and understand your problem.
Seems ImageButton is a composite view which has a few pre-set values. Such as some sort of margin which you cannot override with the XML. If you cannot change your image to match what you want to happen then you are better to create your own composite view.
Here is my example of a composite view you can make yourself:
<FrameLayout android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button android:id="#+id/saveSearchButton"
android:layout_width="50dp"
android:layout_height="50dp" />
<ImageView android:layout_width="45dp"
android:layout_height="45dp"
android:scaleType="fitXY"
android:src="#drawable/ic_menu_save"
android:layout_gravity="center"/>
</FrameLayout>
<FrameLayout android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button android:id="#+id/clearSearchButton"
android:layout_width="50dp"
android:layout_height="50dp" />
<ImageView android:layout_width="45dp"
android:layout_height="45dp"
android:scaleType="fitXY"
android:src="#drawable/ic_menu_close_clear_cancel"
android:layout_gravity="center"/>
</FrameLayout>
And the original buttons:
<ImageButton android:id="#+id/imageButton1"
android:src="#drawable/ic_menu_save"
android:layout_height="45dp" android:layout_width="45dp"/>
<ImageButton android:id="#+id/imageButton2"
android:src="#drawable/ic_menu_close_clear_cancel"
android:layout_height="45dp"
android:layout_width="45dp"/>
Here we can see custom image/button composite followed by the build in ImageButton as part of the SDK:

Set android:background instead of android:src to set the image on the button. This will adjust the image to your button's size. Then adjust the padding after.

You shouldn't use sp as a size dimension - dp should be used as it will help your view scale directly with different screen density and resolutions. See Here for dimensions.
padding will push other elements away from your view boundary. margin will push the contents of your view inward from the your boundary (ie would squash the available space for your picture) . The boundary is specified by height and width. Without more information I would guess you are being confused by your margins - delete them and experiment.
Also useful to you: android:scaleType="fitXY" makes the image stretch to match both the X and Y dimensions that are available to it. It helps you to see the canvas available to your image. Once you feel the area is large enough for a correctly scaled image change the scale type to centerInside. See Here for all scale types.

I use minWidth and minHeight attributes, combined with a fitXY scale type and wrapping its content to modulate the shape of my button.
<ImageButton
android:id="#+id/fooButton"
android:background="#drawable/play_button"
android:backgroundTint="#00000000"
android:minWidth="200"
android:minHeight="100"
android:scaleType="fitXY"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="playStuff"
/>

Can you explain your question more widely so that we can more understood.
As per my understanding You want to set your ImageButton Height/Width. But it doesn't work is it? I want to ask you that, if you write any specific height/width then also it doesn't work?
I copied your code in my files and I changed the height/width manually then it will work.
Please explain your question.
Thanks.

I finished the layout following Graeme's answer. Four "imageButton" fix the bottom, same width, changeable image size. thanks!
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:background="#color/#000"
android:weightSum="100" >
<FrameLayout
android:id="#+id/flBottom1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="25"
>
<Button
android:id="#+id/ibBottom1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#drawable/detail_tab_bg_selector"/>
<ImageView
android:layout_width="32dp"
android:layout_height="32dp"
android:scaleType="fitXY"
android:src="#drawable/icon_home_48_48"
android:layout_gravity="center_horizontal"
android:layout_marginTop="5dp"
/>
<TextView
android:id="#+id/tvBottom1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_gravity="center_horizontal"
android:layout_marginTop="35dp"
android:text="#string/bailty_text_home"
style="#style/bailtyTextBottom"
/>
</FrameLayout>
<FrameLayout
android:id="#+id/flBottom2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="25"
>
<Button
android:id="#+id/ibBottom2"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#drawable/detail_tab_bg_selector"/>
<ImageView
android:layout_width="32dp"
android:layout_height="32dp"
android:scaleType="fitXY"
android:src="#drawable/icon_compose_48_48"
android:layout_gravity="center_horizontal"
/>
<TextView
android:id="#+id/tvBottom2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_gravity="center_horizontal"
android:layout_marginTop="35dp"
android:text="#string/bailty_text_comment"
style="#style/bailtyTextBottom"
/>
</FrameLayout>
<FrameLayout
android:id="#+id/flBottom3"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="25"
>
<Button
android:id="#+id/ibBottom3"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#drawable/detail_tab_bg_selector"/>
<ImageView
android:layout_width="32dp"
android:layout_height="32dp"
android:scaleType="fitXY"
android:src="#drawable/icon_search_48_48"
android:layout_gravity="center_horizontal"
/>
<TextView
android:id="#+id/tvBottom3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_gravity="center_horizontal"
android:layout_marginTop="35dp"
android:text="#string/bailty_text_search"
style="#style/bailtyTextBottom"
/>
</FrameLayout>
<FrameLayout
android:id="#+id/flBottom4"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="25"
>
<Button
android:id="#+id/ibBottom4"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#drawable/detail_tab_bg_selector"/>
<ImageView
android:layout_width="32dp"
android:layout_height="32dp"
android:scaleType="fitXY"
android:src="#drawable/icon_barcode_48_48"
android:layout_gravity="center_horizontal"
/>
<TextView
android:id="#+id/tvBottom4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_gravity="center_horizontal"
android:layout_marginTop="35dp"
android:text="#string/bailty_text_scan_again"
style="#style/bailtyTextBottom"
/>
</FrameLayout>
</LinearLayout>