Develop Reference

How to fit layout to the whole screen for Calculator?

I am making a simple Calculator App, and I am unable to fit the layout to span the whole screen. I have a TextView, an EditText, and buttons and there is a bit of whitespace that remains below. I want my layout to span the whole screen like Android's Calculator.
My XML code file is as follows:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.varun.calculator.MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:id="#+id/textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:lines="2"
android:maxLines="2"
android:textSize="35sp" />
<EditText
android:id="#+id/editText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/textView"
android:enabled="false"
android:inputType="numberDecimal"
android:lines="2"
android:maxLines="2"
android:textSize="20sp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="2"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="#+id/seven"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="7"
android:textSize="25sp" />
<Button
android:id="#+id/eight"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#id/seven"
android:text="8"
android:textSize="25sp" />
<Button
android:id="#+id/nine"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#id/eight"
android:text="9"
android:textSize="25sp" />
<Button
android:id="#+id/four"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/seven"
android:text="4"
android:textSize="25sp" />
<Button
android:id="#+id/five"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/eight"
android:layout_toRightOf="#id/four"
android:text="5"
android:textSize="25sp" />
<Button
android:id="#+id/six"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/nine"
android:layout_toRightOf="#id/five"
android:text="6"
android:textSize="25sp" />
<Button
android:id="#+id/one"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/four"
android:text="1"
android:textSize="25sp" />
<Button
android:id="#+id/two"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/five"
android:layout_toRightOf="#id/one"
android:text="2"
android:textSize="25sp" />
<Button
android:id="#+id/three"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/six"
android:layout_toRightOf="#id/two"
android:text="3"
android:textSize="25sp" />
<Button
android:id="#+id/dot"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/one"
android:text="."
android:textSize="25sp" />
<Button
android:id="#+id/zero"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/two"
android:layout_toRightOf="#id/dot"
android:text="0"
android:textSize="25sp" />
<Button
android:id="#+id/clear"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/three"
android:layout_toRightOf="#id/zero"
android:text="C"
android:textSize="25sp" />
<Button
android:id="#+id/div"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#id/nine"
android:text="/"
android:textSize="25sp" />
<Button
android:id="#+id/mul"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/div"
android:layout_toRightOf="#id/three"
android:text="*"
android:textSize="25sp" />
<Button
android:id="#+id/sub"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/mul"
android:layout_toRightOf="#id/clear"
android:text="-"
android:textSize="25sp" />
<Button
android:id="#+id/equal"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/dot"
android:text="="
android:textSize="25sp" />
<Button
android:id="#+id/add"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/sub"
android:layout_toRightOf="#id/three"
android:text="+"
android:textSize="25sp" />
</RelativeLayout>
</LinearLayout>
</LinearLayout>
Please check the image linked here: 1

This xml might be help you, it will cover the whole page as per your requirement.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:id="#+id/textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:lines="2"
android:maxLines="2"
android:textSize="35sp" />
<EditText
android:id="#+id/editText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/textView"
android:enabled="false"
android:inputType="numberDecimal"
android:lines="2"
android:maxLines="2"
android:textSize="20sp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="2"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="horizontal">
<Button
android:id="#+id/seven"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="7"
android:textSize="25sp" />
<Button
android:id="#+id/eight"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="8"
android:textSize="25sp" />
<Button
android:id="#+id/nine"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="9"
android:textSize="25sp" />
<Button
android:id="#+id/div"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="/"
android:textSize="25sp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
<Button
android:id="#+id/four"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="4"
android:textSize="25sp" />
<Button
android:id="#+id/five"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="5"
android:textSize="25sp" />
<Button
android:id="#+id/six"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="6"
android:textSize="25sp" />
<Button
android:id="#+id/mul"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="*"
android:textSize="25sp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
<Button
android:id="#+id/one"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
android:textSize="25sp" />
<Button
android:id="#+id/two"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2"
android:textSize="25sp" />
<Button
android:id="#+id/three"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="3"
android:textSize="25sp" />
<Button
android:id="#+id/add"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="+"
android:textSize="25sp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
<Button
android:id="#+id/dot"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="."
android:textSize="25sp" />
<Button
android:id="#+id/zero"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="0"
android:textSize="25sp" />
<Button
android:id="#+id/clear"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="C"
android:textSize="25sp" />
<Button
android:id="#+id/sub"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="-"
android:textSize="25sp" />
</LinearLayout>
</LinearLayout>

Remove from parent layout
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
EDIT
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.varun.calculator.MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:id="#+id/textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:lines="2"
android:maxLines="2"
android:textSize="35sp" />
<EditText
android:id="#+id/editText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/textView"
android:enabled="false"
android:inputType="numberDecimal"
android:lines="2"
android:maxLines="2"
android:textSize="20sp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="2"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="#+id/seven"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="7"
android:textSize="25sp" />
<Button
android:id="#+id/eight"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/seven"
android:text="8"
android:textSize="25sp" />
<Button
android:id="#+id/nine"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/eight"
android:text="9"
android:textSize="25sp" />
<Button
android:id="#+id/four"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/seven"
android:text="4"
android:textSize="25sp" />
<Button
android:id="#+id/five"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/eight"
android:layout_toRightOf="#+id/four"
android:text="5"
android:textSize="25sp" />
<Button
android:id="#+id/six"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/nine"
android:layout_toRightOf="#+id/five"
android:text="6"
android:textSize="25sp" />
<Button
android:id="#+id/one"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/four"
android:text="1"
android:textSize="25sp" />
<Button
android:id="#+id/two"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/five"
android:layout_toRightOf="#+id/one"
android:text="2"
android:textSize="25sp" />
<Button
android:id="#+id/three"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/six"
android:layout_toRightOf="#+id/two"
android:text="3"
android:textSize="25sp" />
<Button
android:id="#+id/dot"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/one"
android:text="."
android:textSize="25sp" />
<Button
android:id="#+id/zero"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/two"
android:layout_toRightOf="#+id/dot"
android:text="0"
android:textSize="25sp" />
<Button
android:id="#+id/clear"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/three"
android:layout_toRightOf="#+id/zero"
android:text="C"
android:textSize="25sp" />
<Button
android:id="#+id/div"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/nine"
android:text="/"
android:textSize="25sp" />
<Button
android:id="#+id/mul"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/div"
android:layout_toRightOf="#+id/three"
android:text="*"
android:textSize="25sp" />
<Button
android:id="#+id/sub"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/mul"
android:layout_toRightOf="#+id/clear"
android:text="-"
android:textSize="25sp" />
<Button
android:id="#+id/equal"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/dot"
android:text="="
android:textSize="25sp" />
<Button
android:id="#+id/add"
style="#style/Base.Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/sub"
android:layout_toRightOf="#+id/three"
android:text="+"
android:textSize="25sp" />
</RelativeLayout>
</LinearLayout>
</LinearLayout>

In relative layout instead of keeping android:layout_height="wrap_content" try keeping the value to android:layout_height="match_parent" and i would suggest that you keep equal weight values for each one of them... Try doing that. And maybe if any more blank space is left after doing these steps then remove android:padddingBottom

Placing a logo in Imageview Layout

I'm trying to place an information logo in my layout. Because I already got a logo in the top left, I can't manage to get the other logo in the top right, same height. Does someone know the codeline(s) for that?
this is how my layout looks like now, and the red circle explains where I want my logo to be. Can be a few mm away from it, but just not where it is now.
This is my layout code:
<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="vertical"
tools:context="com.example.rodekruis.MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.rodekruis.MainActivity">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="20dp"
android:src="#drawable/rkz_logo"
android:layout_gravity="left"
android:layout_marginLeft="1dp"/>
<ImageView
android:layout_width="40dp"
android:layout_height="50dp"
android:layout_marginBottom="20dp"
android:layout_marginRightt="40dp"
android:layout_gravity="right"
android:src="#drawable/informatie_logo" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginBottom="20dp"
android:orientation="horizontal">
<Button
android:id="#+id/button10"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_alignTop="#+id/button8"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:text=" Afspraak maken" />
<Button
android:id="#+id/button8"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:text=" Bezoek tijden" />
<Button
android:id="#+id/button9"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_weight="1"
android:text=" Contact" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginTop="10dp"
android:layout_marginBottom="20dp"
android:orientation="horizontal">
<Button
android:id="#+id/button3"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:text="Route" />
<Button
android:id="#+id/button4"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:text="Uw mening" />
<Button
android:id="#+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_alignLeft="#+id/button5"
android:layout_below="#+id/button8"
android:layout_marginLeft="5dp"
android:layout_weight="1"
android:text="Word vriend" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginTop="10dp"
android:orientation="horizontal">
<Button
android:id="#+id/button5"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginRight="5dp"
android:layout_weight="1.03"
android:text="Folders" />
<Button
android:id="#+id/button6"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:text="Specialisten" />
<Button
android:id="#+id/button7"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_weight="0.97"
android:text="Brandwond encentrum" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginTop="30dp"
android:orientation="horizontal">
<Button
android:id="#+id/button2"
style="?android:attr/buttonStyleSmall"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="0dp"
android:layout_weight="1"
android:text="Nieuws en Agenda" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginTop="30dp"
android:layout_marginBottom="40dp"
android:orientation="horizontal">
<Button
android:id="#+id/button11"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:text="Facebook" />
<Button
android:id="#+id/button12"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:text="Youtube" />
<Button
android:id="#+id/button13"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_alignLeft="#+id/button5"
android:layout_below="#+id/button8"
android:layout_marginLeft="5dp"
android:layout_weight="1"
android:text="Twitter" />
<Button
android:id="#+id/button14"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_alignLeft="#+id/button5"
android:layout_below="#+id/button8"
android:layout_marginLeft="5dp"
android:layout_weight="1"
android:text="LinkedIn" />
</LinearLayout>
</LinearLayout>
</LinearLayout>

replace this part of your code:
<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="vertical"
tools:context="com.example.rodekruis.MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.rodekruis.MainActivity">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="20dp"
android:src="#drawable/rkz_logo"
android:layout_gravity="left"
android:layout_marginLeft="1dp"/>
<ImageView
android:layout_width="40dp"
android:layout_height="50dp"
android:layout_marginBottom="20dp"
android:layout_margin="16dp"
android:layout_marginRightt="40dp"
android:layout_gravity="right"
android:src="#drawable/informatie_logo" />
</FrameLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginBottom="20dp"
android:orientation="horizontal">
<Button
android:id="#+id/button10"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_alignTop="#+id/button8"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:text=" Afspraak maken" />
<Button
android:id="#+id/button8"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:text=" Bezoek tijden" />
<Button
android:id="#+id/button9"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_weight="1"
android:text=" Contact" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginTop="10dp"
android:layout_marginBottom="20dp"
android:orientation="horizontal">
<Button
android:id="#+id/button3"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:text="Route" />
<Button
android:id="#+id/button4"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:text="Uw mening" />
<Button
android:id="#+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_alignLeft="#+id/button5"
android:layout_below="#+id/button8"
android:layout_marginLeft="5dp"
android:layout_weight="1"
android:text="Word vriend" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginTop="10dp"
android:orientation="horizontal">
<Button
android:id="#+id/button5"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginRight="5dp"
android:layout_weight="1.03"
android:text="Folders" />
<Button
android:id="#+id/button6"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:text="Specialisten" />
<Button
android:id="#+id/button7"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_weight="0.97"
android:text="Brandwond encentrum" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginTop="30dp"
android:orientation="horizontal">
<Button
android:id="#+id/button2"
style="?android:attr/buttonStyleSmall"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="0dp"
android:layout_weight="1"
android:text="Nieuws en Agenda" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginTop="30dp"
android:layout_marginBottom="40dp"
android:orientation="horizontal">
<Button
android:id="#+id/button11"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:text="Facebook" />
<Button
android:id="#+id/button12"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:text="Youtube" />
<Button
android:id="#+id/button13"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_alignLeft="#+id/button5"
android:layout_below="#+id/button8"
android:layout_marginLeft="5dp"
android:layout_weight="1"
android:text="Twitter" />
<Button
android:id="#+id/button14"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_alignLeft="#+id/button5"
android:layout_below="#+id/button8"
android:layout_marginLeft="5dp"
android:layout_weight="1"
android:text="LinkedIn" />
</LinearLayout>
</LinearLayout>
</LinearLayout>

Using RelativeLayout will help, e.g.:
<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="vertical"
tools:context="com.example.rodekruis.MainActivity">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="20dp"
android:src="#drawable/rkz_logo"
android:layout_marginLeft="1dp"/>
<ImageView
android:layout_width="40dp"
android:layout_height="50dp"
android:layout_alignParentRight="true"
android:layout_marginRight="40dp"
android:layout_marginBottom="20dp"
android:src="#drawable/informatie_logo" />
</RelativeLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginBottom="20dp"
android:orientation="horizontal">
<Button
android:id="#+id/button10"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_alignTop="#+id/button8"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:text=" Afspraak maken" />
<Button
android:id="#+id/button8"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:text=" Bezoek tijden" />
<Button
android:id="#+id/button9"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_weight="1"
android:text=" Contact" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginTop="10dp"
android:layout_marginBottom="20dp"
android:orientation="horizontal">
<Button
android:id="#+id/button3"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:text="Route" />
<Button
android:id="#+id/button4"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:text="Uw mening" />
<Button
android:id="#+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_alignLeft="#+id/button5"
android:layout_below="#+id/button8"
android:layout_marginLeft="5dp"
android:layout_weight="1"
android:text="Word vriend" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginTop="10dp"
android:orientation="horizontal">
<Button
android:id="#+id/button5"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginRight="5dp"
android:layout_weight="1.03"
android:text="Folders" />
<Button
android:id="#+id/button6"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:text="Specialisten" />
<Button
android:id="#+id/button7"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_weight="0.97"
android:text="Brandwond encentrum" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginTop="30dp"
android:orientation="horizontal">
<Button
android:id="#+id/button2"
style="?android:attr/buttonStyleSmall"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="0dp"
android:layout_weight="1"
android:text="Nieuws en Agenda" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginTop="30dp"
android:layout_marginBottom="40dp"
android:orientation="horizontal">
<Button
android:id="#+id/button11"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:text="Facebook" />
<Button
android:id="#+id/button12"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:text="Youtube" />
<Button
android:id="#+id/button13"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_alignLeft="#+id/button5"
android:layout_below="#+id/button8"
android:layout_marginLeft="5dp"
android:layout_weight="1"
android:text="Twitter" />
<Button
android:id="#+id/button14"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_alignLeft="#+id/button5"
android:layout_below="#+id/button8"
android:layout_marginLeft="5dp"
android:layout_weight="1"
android:text="LinkedIn" />
</LinearLayout>

Here i have changed your Root Layout to Relative Layout because Linear Layout will not hold Margin Top or Margin Right so I have moved out both your ImageView outside Linear Layout to make it positioned as you wanted. And given Layout_Below to all child Linear Layouts. Apply below XML to your Layout.
NOTE: Always try to give ID to each Root tag or it's child so it will be easier to identify it.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/RLMain"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:id="#+id/img2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left"
android:layout_marginLeft="1dp"
android:src="#mipmap/ic_launcher" />
<ImageView
android:id="#+id/img1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_gravity="right"
android:layout_marginRight="30dp"
android:layout_marginTop="30dp"
android:src="#mipmap/ic_launcher" />
<LinearLayout
android:id="#+id/LL2"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_below="#+id/img1"
android:layout_marginTop="5dp"
android:orientation="horizontal">
<Button
android:id="#+id/button10"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_alignTop="#+id/button8"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:text=" Afspraak maken" />
<Button
android:id="#+id/button8"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:text=" Bezoek tijden" />
<Button
android:id="#+id/button9"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_weight="1"
android:text=" Contact" />
</LinearLayout>
<LinearLayout
android:id="#+id/LL3"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_below="#+id/LL2"
android:layout_marginBottom="20dp"
android:layout_marginTop="10dp"
android:orientation="horizontal">
<Button
android:id="#+id/button3"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:text="Route" />
<Button
android:id="#+id/button4"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:text="Uw mening" />
<Button
android:id="#+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_alignLeft="#+id/button5"
android:layout_below="#+id/button8"
android:layout_marginLeft="5dp"
android:layout_weight="1"
android:text="Word vriend" />
</LinearLayout>
<LinearLayout
android:id="#+id/LL4"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_below="#+id/LL3"
android:layout_marginTop="10dp"
android:orientation="horizontal">
<Button
android:id="#+id/button5"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginRight="5dp"
android:layout_weight="1.03"
android:text="Folders" />
<Button
android:id="#+id/button6"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:text="Specialisten" />
<Button
android:id="#+id/button7"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_weight="0.97"
android:text="Brandwond encentrum" />
</LinearLayout>
<LinearLayout
android:id="#+id/LL5"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_below="#+id/LL4"
android:layout_marginTop="30dp"
android:orientation="horizontal">
<Button
android:id="#+id/button2"
style="?android:attr/buttonStyleSmall"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="0dp"
android:layout_weight="1"
android:text="Nieuws en Agenda" />
</LinearLayout>
<LinearLayout
android:id="#+id/LL6"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_below="#+id/LL5"
android:layout_marginBottom="40dp"
android:layout_marginTop="30dp"
android:orientation="horizontal">
<Button
android:id="#+id/button11"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:text="Facebook" />
<Button
android:id="#+id/button12"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:text="Youtube" />
<Button
android:id="#+id/button13"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_alignLeft="#+id/button5"
android:layout_below="#+id/button8"
android:layout_marginLeft="5dp"
android:layout_weight="1"
android:text="Twitter" />
<Button
android:id="#+id/button14"
style="?android:attr/buttonStyleSmall"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_alignLeft="#+id/button5"
android:layout_below="#+id/button8"
android:layout_marginLeft="5dp"
android:layout_weight="1"
android:text="LinkedIn" />
</LinearLayout>
</RelativeLayout>

How to layout my android application?

I am writing a math application for my daughter. It shall consist of upper row with assignment to solve, some progress bar and then keypad on left and function pad on right. This is my idea:
I started with a linear layout holding set of linear layouts. Android studio argues that nested weights have bad performance. And I failed to have 4 rows of keypad besides 5 rows of functions. This is my current progress:
Then I used a table layout but it does not have row span. So I switched to a relative layout, but I failed to distribute rows evenly. The last attempt was grid layout, but again I cannot distribute the rows evenly.
Any idea, how to achieve my goal?
<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" tools:context=".CalcActivity"
android:columnCount="5"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="fill_vertical"
android:useDefaultMargins="true"
android:orientation="horizontal">
<TextView
android:layout_gravity="fill_horizontal|center_vertical"
android:text="1"
android:id="#+id/firstOperand"
style="#style/KeypadButton"
android:layout_column="0"
android:layout_row="0" />
<TextView
android:text="+"
android:id="#+id/operator"
style="#style/KeypadFunctionButton"
android:layout_column="1"
android:layout_row="0"
android:layout_gravity="fill_horizontal|center_vertical"
/>
<TextView
android:text="1"
android:id="#+id/secondOperand"
style="#style/KeypadButton"
android:layout_column="2"
android:layout_row="0"
android:layout_gravity="fill_horizontal|center_vertical"
/>
<TextView
android:text="="
android:id="#+id/equalView"
android:layout_gravity="fill_horizontal|center_vertical"
style="#style/KeypadFunctionButton"
android:layout_column="3"
android:layout_row="0" />
<TextView
android:text="2"
android:id="#+id/resultView"
style="#style/KeypadButton"
android:layout_column="4"
android:layout_row="0"
android:layout_gravity="fill_horizontal|center_vertical"
/>
<SeekBar
android:id="#+id/seekBar"
android:layout_gravity="fill_horizontal|center_vertical"
android:onClick=""
android:layout_row="1"
android:layout_columnSpan="4"
android:layout_column="0" />
<ImageView
android:id="#+id/progressImage"
android:layout_gravity="fill_horizontal|center_vertical"
android:src="#drawable/ic_action_cat"
android:layout_row="1"
android:layout_column="4" />
<LinearLayout
android:layout_gravity="fill_horizontal|center_vertical"
android:orientation="vertical"
android:layout_row="2"
android:layout_rowSpan="4"
android:layout_column="4">
<Button
android:text="←"
android:id="#+id/buttonBackspace"
style="#style/KeypadFunctionButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:text="+"
android:id="#+id/buttonPlus"
style="#style/KeypadFunctionButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:text="-"
android:id="#+id/buttonMinus"
style="#style/KeypadFunctionButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:text="*"
android:id="#+id/buttonMultiply"
style="#style/KeypadFunctionButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:text="/"
android:id="#+id/buttonDivide"
style="#style/KeypadFunctionButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
<Button
android:text="7"
android:id="#+id/digit7"
android:layout_gravity="fill_horizontal|center_vertical"
style="#style/KeypadButton"
android:layout_row="2"
android:layout_column="0" />
<Button
android:text="8"
android:id="#+id/digit8"
android:layout_gravity="fill_horizontal|center_vertical"
style="#style/KeypadButton"
android:layout_column="1"
android:layout_row="2" />
<Button
android:text="9"
android:id="#+id/digit9"
android:layout_gravity="fill_horizontal|center_vertical"
style="#style/KeypadButton"
android:layout_column="2"
android:layout_row="2" />
<Button
android:text="4"
android:id="#+id/digit4"
android:layout_gravity="fill_horizontal|center_vertical"
style="#style/KeypadButton"
android:layout_row="3"
android:layout_column="0" />
<Button
android:text="5"
android:id="#+id/digit5"
android:layout_gravity="fill_horizontal|center_vertical"
style="#style/KeypadButton"
android:layout_column="1"
android:layout_row="3" />
<Button
android:text="6"
android:id="#+id/digit6"
android:layout_gravity="fill_horizontal|center_vertical"
style="#style/KeypadButton"
android:layout_column="2"
android:layout_row="3" />
<Button
android:text="1"
android:id="#+id/digit1"
android:layout_gravity="fill_horizontal|center_vertical"
style="#style/KeypadButton"
android:layout_row="4"
android:layout_column="0" />
<Button
android:text="2"
android:id="#+id/digit2"
android:layout_gravity="fill_horizontal|center_vertical"
style="#style/KeypadButton"
android:layout_column="1"
android:layout_row="4" />
<Button
android:text="3"
android:id="#+id/digit3"
android:layout_gravity="fill_horizontal|center_vertical"
style="#style/KeypadButton"
android:layout_column="2"
android:layout_row="4" />
<Button
android:text=","
android:id="#+id/buttonComma"
android:layout_gravity="fill_horizontal|center_vertical"
style="#style/KeypadButton"
android:layout_row="5"
android:layout_column="0" />
<Button
android:text="0"
android:id="#+id/digit0"
android:layout_gravity="fill_horizontal|center_vertical"
style="#style/KeypadButton"
android:layout_column="1"
android:layout_row="5" />
<Button
android:text="="
android:id="#+id/buttonResult"
android:layout_gravity="fill_horizontal|center_vertical"
style="#style/KeypadFunctionButton"
android:layout_column="2"
android:layout_row="5" />
</GridLayout>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" tools:context=".CalcActivity"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
>
<TextView
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:text="1"
android:id="#+id/firstOperand"
style="#style/KeypadButton" />
<TextView
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_toRightOf="#id/firstOperand"
android:text="+"
android:id="#+id/operator"
style="#style/KeypadFunctionButton" />
<TextView
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_toRightOf="#id/operator"
android:text="1"
android:id="#+id/secondOperand"
style="#style/KeypadButton" />
<TextView
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_toRightOf="#id/secondOperand"
android:text="="
android:id="#+id/equalView"
style="#style/KeypadFunctionButton" />
<TextView
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_toRightOf="#id/equalView"
android:text="2"
android:id="#+id/resultView"
style="#style/KeypadButton" />
<SeekBar
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/firstOperand"
android:id="#+id/seekBar"
android:layout_gravity="center_vertical"
android:onClick=""
/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/firstOperand"
android:layout_toRightOf="#id/seekBar"
android:id="#+id/progressImage"
android:src="#drawable/ic_action_cat"
android:layout_gravity="center"
android:layout_alignParentRight="true" />
<Button
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_below="#id/progressImage"
android:layout_alignParentRight="true"
android:text="←"
android:id="#+id/buttonBackspace"
style="#style/KeypadFunctionButton" />
<Button
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_below="#id/seekBar"
android:text="7"
android:id="#+id/digit7"
style="#style/KeypadButton" />
<Button
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_below="#id/seekBar"
android:layout_toRightOf="#id/digit7"
android:text="8"
android:id="#+id/digit8"
style="#style/KeypadButton" />
<Button
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_below="#id/seekBar"
android:layout_toRightOf="#id/digit8"
android:text="9"
android:id="#+id/digit9"
style="#style/KeypadButton" />
<Button
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_below="#id/buttonBackspace"
android:text="+"
android:id="#+id/buttonPlus"
style="#style/KeypadFunctionButton"
android:layout_alignParentRight="true" />
<Button
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_below="#id/digit7"
android:text="4"
android:id="#+id/digit4"
style="#style/KeypadButton" />
<Button
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_below="#id/digit7"
android:layout_toRightOf="#id/digit4"
android:text="5"
android:id="#+id/digit5"
style="#style/KeypadButton" />
<Button
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_below="#id/digit7"
android:layout_toRightOf="#id/digit5"
android:text="6"
android:id="#+id/digit6"
style="#style/KeypadButton" />
<Button
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_below="#+id/buttonPlus"
android:text="-"
android:id="#+id/buttonMinus"
style="#style/KeypadFunctionButton"
android:layout_alignParentRight="true" />
<Button
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_below="#id/digit4"
android:text="1"
android:id="#+id/digit1"
style="#style/KeypadButton" />
<Button
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_below="#id/digit4"
android:layout_toRightOf="#id/digit1"
android:text="2"
android:id="#+id/digit2"
style="#style/KeypadButton" />
<Button
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_below="#id/digit4"
android:layout_toRightOf="#id/digit2"
android:text="3"
android:id="#+id/digit3"
style="#style/KeypadButton" />
<Button
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_below="#+id/buttonMinus"
android:text="*"
android:id="#+id/buttonMultiply"
style="#style/KeypadFunctionButton"
android:layout_alignParentRight="true" />
<Button
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_below="#id/digit1"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:text=","
android:id="#+id/buttonComma"
style="#style/KeypadButton" />
<Button
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_below="#id/digit1"
android:layout_toRightOf="#id/buttonComma"
android:text="0"
android:id="#+id/digit0"
style="#style/KeypadButton" />
<Button
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_below="#id/digit1"
android:layout_toRightOf="#id/digit0"
android:text="="
android:id="#+id/buttonResult"
style="#style/KeypadFunctionButton" />
<Button
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_below="#+id/buttonMultiply"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:text="/"
android:id="#+id/buttonDivide"
style="#style/KeypadFunctionButton" />
</RelativeLayout>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" tools:context=".CalcActivity"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
android:orientation="vertical">
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:id="#+id/assignment">
<TextView
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="50"
android:id="#+id/textView"
style="#style/KeypadButton" />
<TextView
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="+"
android:id="#+id/textView2"
style="#style/KeypadFunctionButton" />
<TextView
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="51"
android:id="#+id/textView3"
style="#style/KeypadButton" />
<TextView
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="="
android:id="#+id/textView4"
style="#style/KeypadFunctionButton" />
<TextView
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="101"
android:id="#+id/textView5"
style="#style/KeypadButton" />
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="0.4">
<SeekBar
android:layout_width="0dp"
android:layout_height="wrap_content"
android:id="#+id/seekBar"
android:layout_weight="3" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/progressImage"
android:src="#drawable/ic_action_cat"
android:layout_gravity="center" />
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="0.6">
<Space
android:layout_width="0dp"
android:layout_height="20px"
android:layout_weight="3"
/>
<Button
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1"
android:text="←"
android:id="#+id/button"
style="#style/KeypadFunctionButton" />
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:id="#+id/upperDigits">
<Button
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1"
android:text="7"
android:id="#+id/button2"
style="#style/KeypadButton" />
<Button
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1"
android:text="8"
android:id="#+id/button3"
style="#style/KeypadButton" />
<Button
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1"
android:text="9"
android:id="#+id/button4"
style="#style/KeypadButton" />
<Button
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1"
android:text="+"
android:id="#+id/button5"
style="#style/KeypadFunctionButton" />
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:id="#+id/middleDigits">
<Button
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1"
android:text="4"
android:id="#+id/button6"
style="#style/KeypadButton" />
<Button
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1"
android:text="5"
android:id="#+id/button7"
style="#style/KeypadButton" />
<Button
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1"
android:text="6"
android:id="#+id/button8"
style="#style/KeypadButton" />
<Button
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1"
android:text="-"
android:id="#+id/button9"
style="#style/KeypadFunctionButton" />
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:id="#+id/lowDigits">
<Button
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1"
android:text="1"
android:id="#+id/button10"
style="#style/KeypadButton" />
<Button
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1"
android:text="2"
android:id="#+id/button11"
style="#style/KeypadButton" />
<Button
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1"
android:text="3"
android:id="#+id/button12"
style="#style/KeypadButton" />
<Button
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1"
android:text="*"
android:id="#+id/button13"
style="#style/KeypadFunctionButton" />
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:id="#+id/bottomDigits">
<Button
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1"
android:text=","
android:id="#+id/button14"
style="#style/KeypadButton" />
<Button
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1"
android:text="0"
android:id="#+id/button15"
style="#style/KeypadButton" />
<Button
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1"
android:text="="
android:id="#+id/button16"
style="#style/KeypadFunctionButton" />
<Button
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1"
android:text="/"
android:id="#+id/button17"
style="#style/KeypadFunctionButton" />
</LinearLayout>
</LinearLayout>
EDIT: both my and chiru's attempts with a relative layout ends with expanded progress bar section taking all available space.

Look like i almost did what you want using LinearLayout. Take a look of screenshot bro.
<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="vertical"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".CalcActivity" >
<LinearLayout
android:id="#+id/keyboard"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/seekbar"
android:layout_alignParentBottom="true"
android:layout_marginBottom="25dp"
android:orientation="horizontal"
android:weightSum="2" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<Button
android:id="#+id/button6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="6dp"
android:text="9" />
<Button
android:id="#+id/button7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="6dp"
android:text="8" />
<Button
android:id="#+id/button8"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="6dp"
android:text="7" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<Button
android:id="#+id/button9"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="6dp"
android:text="6" />
<Button
android:id="#+id/button10"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="6dp"
android:text="5" />
<Button
android:id="#+id/button11"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="6dp"
android:text="4" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<Button
android:id="#+id/button12"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="6dp"
android:text="3" />
<Button
android:id="#+id/button13"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="6dp"
android:text="2" />
<Button
android:id="#+id/button14"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="6dp"
android:text="1" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<Button
android:id="#+id/button15"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="6dp"
android:text="," />
<Button
android:id="#+id/button16"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="6dp"
android:text="0" />
<Button
android:id="#+id/button17"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="6dp"
android:text="=" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1"
android:orientation="vertical" >
<Button
android:id="#+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="←" />
<Button
android:id="#+id/button2"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="+" />
<Button
android:id="#+id/button3"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="-" />
<Button
android:id="#+id/button4"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="/" />
<Button
android:id="#+id/button5"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="*" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:id="#+id/assignment"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="25dp"
android:orientation="horizontal"
android:weightSum="5" >
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:text="50"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:text="+"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="#+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:text="51"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="#+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:text="="
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="#+id/textView5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:text="101"
android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>
<LinearLayout
android:id="#+id/seekbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/assignment"
android:layout_below="#+id/assignment"
android:layout_marginTop="32dp"
android:orientation="horizontal" >
<SeekBar
android:id="#+id/seekBar"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="3" />
<ImageView
android:id="#+id/progressImage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:src="#drawable/ic_launcher" />
</LinearLayout>
</RelativeLayout>
As i don't have those styles, i have been forced to remove it.
edited screenshot:

How to align buttons in Android

I want to create buttons for each "letter" A to Z. Whatever I do I can't align some of them abreast. I cant add more than 2 rows and 6 buttons for each row even though there is space on the right. How can I create buttons A to Z?
http://postimg.org/image/5h4wyfuj5/
<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"
tools:context="com.kelimeoyunu.Kelime" >
<TextView
android:id="#+id/kelime"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginTop="26dp"
android:layout_toRightOf="#+id/button1"
android:text="test" />
<Button
android:id="#+id/button2"
style="?android:attr/buttonStyleSmall"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_alignParentLeft="true"
android:layout_below="#+id/kelime"
android:layout_marginLeft="24dp"
android:layout_marginTop="81dp"
android:background="#layout/mybutton"
android:gravity="center"
android:text="A"
android:textColor="#ffffff"
android:textSize="17sp" />
<Button
android:id="#+id/button4"
style="?android:attr/buttonStyleSmall"
android:gravity="center"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_alignBaseline="#+id/button2"
android:layout_alignBottom="#+id/button2"
android:layout_toRightOf="#+id/button2"
android:background="#layout/mybutton"
android:text="B"
android:textColor="#ffffff"
android:textSize="17sp" />
<Button
android:id="#+id/button3"
style="?android:attr/buttonStyleSmall"
android:gravity="center"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_alignBaseline="#+id/button4"
android:layout_alignBottom="#+id/button4"
android:layout_toRightOf="#+id/button4"
android:background="#layout/mybutton"
android:text="C"
android:textColor="#ffffff"
android:textSize="17sp" />
<Button
android:id="#+id/Button01"
style="?android:attr/buttonStyleSmall"
android:gravity="center"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_alignBaseline="#+id/button3"
android:layout_alignBottom="#+id/button3"
android:layout_toRightOf="#+id/button3"
android:background="#layout/mybutton"
android:text="Ç"
android:textColor="#ffffff"
android:textSize="17sp" />
<Button
android:id="#+id/Button02"
style="?android:attr/buttonStyleSmall"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_alignBaseline="#+id/Button01"
android:layout_alignBottom="#+id/Button01"
android:layout_toRightOf="#+id/Button01"
android:background="#layout/mybutton"
android:gravity="center"
android:text="D"
android:textColor="#ffffff"
android:textSize="17sp" />
<Button
android:id="#+id/Button03"
style="?android:attr/buttonStyleSmall"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_alignBaseline="#+id/Button02"
android:layout_alignBottom="#+id/Button02"
android:layout_toRightOf="#+id/Button02"
android:background="#layout/mybutton"
android:gravity="center"
android:text="E"
android:textColor="#ffffff"
android:textSize="17sp" />
<Button
android:id="#+id/Button06"
style="?android:attr/buttonStyleSmall"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_below="#+id/button4"
android:layout_toLeftOf="#+id/button3"
android:background="#layout/mybutton"
android:gravity="center"
android:text="Ç"
android:textColor="#ffffff"
android:textSize="17sp" />
<Button
android:id="#+id/Button04"
style="?android:attr/buttonStyleSmall"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_below="#+id/button2"
android:layout_toLeftOf="#+id/button4"
android:background="#layout/mybutton"
android:gravity="center"
android:text="Ç"
android:textColor="#ffffff"
android:textSize="17sp" />
<Button
android:id="#+id/Button05"
style="?android:attr/buttonStyleSmall"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_below="#+id/button4"
android:layout_toRightOf="#+id/button4"
android:background="#layout/mybutton"
android:gravity="center"
android:text="Ç"
android:textColor="#ffffff"
android:textSize="17sp" />
<Button
android:id="#+id/Button07"
style="?android:attr/buttonStyleSmall"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_below="#+id/Button01"
android:layout_toLeftOf="#+id/Button02"
android:background="#layout/mybutton"
android:gravity="center"
android:text="Ç"
android:textColor="#ffffff"
android:textSize="17sp" />
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/Button07"
android:layout_alignBottom="#+id/Button07"
android:layout_toRightOf="#+id/Button01"
android:text="Button" />
<Button
android:id="#+id/Button09"
style="?android:attr/buttonStyleSmall"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_below="#+id/Button02"
android:layout_toRightOf="#+id/Button02"
android:background="#layout/mybutton"
android:gravity="center"
android:text="Ç"
android:textColor="#ffffff"
android:textSize="17sp" />
<Button
android:id="#+id/Button08"
style="?android:attr/buttonStyleSmall"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_below="#+id/Button01"
android:layout_toRightOf="#+id/Button01"
android:background="#layout/mybutton"
android:gravity="center"
android:text="Ç"
android:textColor="#ffffff"
android:textSize="17sp" />
<Button
android:id="#+id/Button10"
style="?android:attr/buttonStyleSmall"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_alignBaseline="#+id/Button11"
android:layout_alignBottom="#+id/Button11"
android:layout_toRightOf="#+id/Button11"
android:background="#layout/mybutton"
android:gravity="center"
android:text="E"
android:textColor="#ffffff"
android:textSize="17sp" />
<Button
android:id="#+id/Button12"
style="?android:attr/buttonStyleSmall"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:background="#layout/mybutton"
android:gravity="center"
android:text="E"
android:textColor="#ffffff"
android:textSize="17sp" />
<Button
android:id="#+id/Button11"
style="?android:attr/buttonStyleSmall"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_alignLeft="#+id/Button04"
android:layout_below="#+id/Button04"
android:background="#layout/mybutton"
android:gravity="center"
android:text="E"
android:textColor="#ffffff"
android:textSize="17sp" />
</RelativeLayout>

I'm not exactly sure what is the problem. The way i see it, i would have tried with two horizontal LinearLayouts inside a vertical LinearLayout. Something like this, you just have to give it a proper margin:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="match_parent">
<LinearLayout
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"/>
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"/>
</LinearLayout>
</LinearLayout>
</LinearLayout>
EDIT WITH PIC:

I would put the buttons in a grid layout, thats what its for. As far as I know, for centering it you have to wrap it all in a relativelayout, so in the end its like
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/holder"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<GridLayout
android:id="#+id/grid"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:columnCount="6"
android:rowCount="2" >
<Button
android:id="#+id/button0"
android:layout_column="0"
android:layout_row="0"
android:text="Button" />
<Button
android:id="#+id/button1"
android:layout_column="1"
android:layout_row="0"
android:text="Button" />
<Button
android:id="#+id/button2"
android:layout_column="2"
android:layout_row="0"
android:text="Button" />
<Button
android:id="#+id/button3"
android:layout_column="3"
android:layout_row="0"
android:text="Button" />
<Button
android:id="#+id/button4"
android:layout_column="4"
android:layout_row="0"
android:text="Button" />
<Button
android:id="#+id/button5"
android:layout_column="5"
android:layout_row="0"
android:text="Button" />
<Button
android:id="#+id/button6"
android:layout_column="0"
android:layout_row="1"
android:text="Button" />
<Button
android:id="#+id/button7"
android:layout_column="1"
android:layout_row="1"
android:text="Button" />
<Button
android:id="#+id/button8"
android:layout_column="2"
android:layout_row="1"
android:text="Button" />
<Button
android:id="#+id/button9"
android:layout_column="3"
android:layout_row="1"
android:text="Button" />
<Button
android:id="#+id/button10"
android:layout_column="4"
android:layout_row="1"
android:text="Button" />
<Button
android:id="#+id/button11"
android:layout_column="5"
android:layout_row="1"
android:text="Button" />
</GridLayout>
</RelativeLayout>

You should use gridlayout to get the same space between them.
Example:
<GridLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="24dp"
android:columnCount="4"
android:rowCount="5">
<android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="#+id/card_view1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="1"
android:layout_row="1"
android:clickable="true"
android:foreground="?selectableItemBackground"
android:stateListAnimator="#anim/raise"
card_view:cardBackgroundColor="#color/md_red_400"
card_view:cardCornerRadius="4dp">
<TextView
android:id="#+id/textView1"
android:layout_width="80dp"
android:layout_height="48dp"
android:layout_gravity="center"
android:gravity="center"
android:text="Red"
android:textColor="#color/md_text_white" />
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="#+id/card_view2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="2"
android:layout_marginLeft="24dp"
android:layout_row="1"
android:clickable="true"
android:foreground="?selectableItemBackground"
android:stateListAnimator="#anim/raise"
card_view:cardBackgroundColor="#color/md_blue_400"
card_view:cardCornerRadius="4dp">
<TextView
android:id="#+id/textView2"
android:layout_width="80dp"
android:layout_height="48dp"
android:layout_gravity="center"
android:gravity="center"
android:text="Blue"
android:textColor="#color/md_text_white" />
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="#+id/card_view3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="1"
android:layout_marginTop="24dp"
android:layout_row="2"
android:clickable="true"
android:foreground="?selectableItemBackground"
android:stateListAnimator="#anim/raise"
card_view:cardBackgroundColor="#color/md_green_400"
card_view:cardCornerRadius="4dp">
<TextView
android:id="#+id/textView3"
android:layout_width="80dp"
android:layout_height="48dp"
android:layout_gravity="center"
android:gravity="center"
android:text="Green"
android:textColor="#color/md_text_white" />
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="#+id/card_view4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="2"
android:layout_marginLeft="24dp"
android:layout_marginTop="24dp"
android:layout_row="2"
android:clickable="true"
android:foreground="?selectableItemBackground"
android:stateListAnimator="#anim/raise"
card_view:cardBackgroundColor="#color/md_orange_400"
card_view:cardCornerRadius="4dp">
<TextView
android:id="#+id/textView4"
android:layout_width="80dp"
android:layout_height="48dp"
android:layout_gravity="center"
android:gravity="center"
android:text="Orange"
android:textColor="#color/md_text_white" />
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="#+id/card_view5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="1"
android:layout_marginTop="24dp"
android:layout_row="3"
android:clickable="true"
android:foreground="?selectableItemBackground"
android:stateListAnimator="#anim/raise"
card_view:cardBackgroundColor="#color/md_pink_400"
card_view:cardCornerRadius="4dp">
<TextView
android:id="#+id/textView5"
android:layout_width="80dp"
android:layout_height="48dp"
android:layout_gravity="center"
android:gravity="center"
android:text="Pink"
android:textColor="#color/md_text_white" />
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="#+id/card_view6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="2"
android:layout_marginLeft="24dp"
android:layout_marginTop="24dp"
android:layout_row="3"
android:clickable="true"
android:foreground="?selectableItemBackground"
android:stateListAnimator="#anim/raise"
card_view:cardBackgroundColor="#color/md_indigo_400"
card_view:cardCornerRadius="4dp">
<TextView
android:id="#+id/textView6"
android:layout_width="80dp"
android:layout_height="48dp"
android:layout_gravity="center"
android:gravity="center"
android:text="Indigo"
android:textColor="#color/md_text_white" />
</android.support.v7.widget.CardView>
<Space
android:layout_width="16dp"
android:layout_height="16dp"
android:layout_column="1"
android:layout_row="4" />
<Space
android:layout_width="16dp"
android:layout_height="16dp"
android:layout_column="3"
android:layout_row="1" />
</GridLayout>
Six color cards:

Buttons distributed on top of an image, that stay in the same position no mater the screensize

I am making an app in which I am doing the following:
25 buttons (the red, 5x5) that are equally distributed throughout an image in the background and on the left side 5 buttons (brown) a bit closer to the edge.
I have looked at a few similar questions here, with relative layout, but the problem is that as soon as I adjust for one screen size, it doesn't fit with another any more...
Here is how it looks on my phone screen:
On other screensizes:
Here is my code:
(a bunch of code before that, but part about the image):
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:scaleType="fitXY"
android:src="#drawable/chord_box1" />
<LinearLayout
android:id="#+id/firstrow"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/imageView1"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:gravity="center_horizontal"
android:orientation="vertical"
android:weightSum="10" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_weight="4"
android:gravity="center_horizontal"
android:orientation="horizontal" >
<Button
android:id="#+id/empty1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Button"
android:visibility="invisible" />
<TextView
android:id="#+id/fretposition1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_weight="1"
android:gravity="center"
android:text="1" />
<TextView
android:id="#+id/fretposition2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_weight="1"
android:gravity="center"
android:text="2" />
<TextView
android:id="#+id/fretposition3"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_weight="1"
android:gravity="center"
android:text="3" />
<TextView
android:id="#+id/fretposition4"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_weight="1"
android:gravity="center"
android:text="4" />
<TextView
android:id="#+id/fretposition5"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_weight="1"
android:gravity="center"
android:text="5" />
<Button
android:id="#+id/empty2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Button"
android:visibility="invisible" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_weight="1.1"
android:gravity="center_horizontal"
android:orientation="horizontal" >
<Button
android:id="#+id/empty4"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.55"
android:text=""
android:visibility="invisible" />
<Button
android:id="#+id/fret10"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginRight="-20dp"
android:layout_weight="1"
android:background="#drawable/no_press1"
android:text=""
android:textColor="#ffffff" />
<Button
android:id="#+id/fret11"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#drawable/finger1"
android:text="1"
android:textColor="#ffffff" />
<Button
android:id="#+id/fret12"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#drawable/finger1"
android:text="2"
android:textColor="#ffffff" />
<Button
android:id="#+id/fret13"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#drawable/finger1"
android:text="3"
android:textColor="#ffffff" />
<Button
android:id="#+id/fret14"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#drawable/finger1"
android:text="4"
android:textColor="#ffffff" />
<Button
android:id="#+id/fret15"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#drawable/finger1"
android:text="1"
android:textColor="#ffffff" />
<Button
android:id="#+id/empty3"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Button"
android:visibility="invisible" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_weight="1"
android:gravity="center_horizontal"
android:orientation="horizontal" >
<Button
android:id="#+id/empty5"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.55"
android:text=""
android:visibility="invisible" />
<Button
android:id="#+id/fret20"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginRight="-20dp"
android:layout_weight="1"
android:background="#drawable/no_press1"
android:text=""
android:textColor="#ffffff" />
<Button
android:id="#+id/fret21"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#drawable/finger1"
android:text="1"
android:textColor="#ffffff" />
<Button
android:id="#+id/fret22"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#drawable/finger1"
android:text="2"
android:textColor="#ffffff" />
<Button
android:id="#+id/fret23"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#drawable/finger1"
android:text="3"
android:textColor="#ffffff" />
<Button
android:id="#+id/fret24"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#drawable/finger1"
android:text="4"
android:textColor="#ffffff" />
<Button
android:id="#+id/fret25"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#drawable/finger1"
android:text="1"
android:textColor="#ffffff" />
<Button
android:id="#+id/empty6"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Button"
android:visibility="invisible" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_weight="1"
android:gravity="center_horizontal"
android:orientation="horizontal" >
<Button
android:id="#+id/empty7"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.55"
android:text=""
android:visibility="invisible" />
<Button
android:id="#+id/fret30"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginRight="-20dp"
android:layout_weight="1"
android:background="#drawable/no_press1"
android:text=""
android:textColor="#ffffff" />
<Button
android:id="#+id/fret31"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#drawable/finger1"
android:text="1"
android:textColor="#ffffff" />
<Button
android:id="#+id/fret32"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#drawable/finger1"
android:text="2"
android:textColor="#ffffff" />
<Button
android:id="#+id/fret33"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#drawable/finger1"
android:text="3"
android:textColor="#ffffff" />
<Button
android:id="#+id/fret34"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#drawable/finger1"
android:text="4"
android:textColor="#ffffff" />
<Button
android:id="#+id/fret35"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#drawable/finger1"
android:text="1"
android:textColor="#ffffff" />
<Button
android:id="#+id/empty8"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Button"
android:visibility="invisible" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_weight="1"
android:gravity="center_horizontal"
android:orientation="horizontal" >
<Button
android:id="#+id/empty9"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.55"
android:text=""
android:visibility="invisible" />
<Button
android:id="#+id/fret40"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginRight="-20dp"
android:layout_weight="1"
android:background="#drawable/no_press1"
android:text=""
android:textColor="#ffffff" />
<Button
android:id="#+id/fret41"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#drawable/finger1"
android:text="1"
android:textColor="#ffffff" />
<Button
android:id="#+id/fret42"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#drawable/finger1"
android:text="2"
android:textColor="#ffffff" />
<Button
android:id="#+id/fret43"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#drawable/finger1"
android:text="3"
android:textColor="#ffffff" />
<Button
android:id="#+id/fret44"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#drawable/finger1"
android:text="4"
android:textColor="#ffffff" />
<Button
android:id="#+id/fret45"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#drawable/finger1"
android:text="1"
android:textColor="#ffffff" />
<Button
android:id="#+id/empty10"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text=""
android:visibility="invisible" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="10dp"
android:layout_weight="1"
android:gravity="center_horizontal"
android:orientation="horizontal" >
<Button
android:id="#+id/empty11"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.55"
android:text=""
android:visibility="invisible" />
<Button
android:id="#+id/fret50"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginRight="-20dp"
android:layout_weight="1"
android:background="#drawable/no_press1"
android:text=""
android:textColor="#ffffff" />
<Button
android:id="#+id/fret51"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#drawable/finger1"
android:text="1"
android:textColor="#ffffff" />
<Button
android:id="#+id/fret52"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#drawable/finger1"
android:text="2"
android:textColor="#ffffff" />
<Button
android:id="#+id/fret53"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#drawable/finger1"
android:text="3"
android:textColor="#ffffff" />
<Button
android:id="#+id/fret54"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#drawable/finger1"
android:text="4"
android:textColor="#ffffff" />
<Button
android:id="#+id/fret55"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#drawable/finger1"
android:text="1"
android:textColor="#ffffff" />
<Button
android:id="#+id/empty12"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text=""
android:visibility="invisible" />
</LinearLayout>
<Button
android:id="#+id/empty13"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text=""
android:visibility="invisible" />
</LinearLayout>
</RelativeLayout>
I've made the first row and tried to make it fit, but I'm not sure how to make it fit on different screens. Is this the right way to do it, or should it maybe be done on the java code instead of the xml?

Change the layout_height of your top-level LinearLayout to "match_parent". Then it will cover the entire screen vertically.
<LinearLayout
android:id="#+id/firstrow"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignBottom="#+id/imageView1"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:gravity="center_horizontal"
android:orientation="vertical"
android:weightSum="10" >
You might need to re-adjust the weights to make it look exactly as it did before.