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How to make value to be fixed and highlight in center while scrolling

I have a requirement to create UI like below
You can see here the number is the highlighted part and it is in center always.
And we scroll it from left to right or vice versa.
I want to achieve this So, I wrote some code like below. But I don't have any Idea on how to add scroll effect to it and bring highlighted text to center
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
app:layout_constraintBottom_toTopOf="#+id/idCameraControlBottom"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent">
<TextView
android:id="#+id/idZoom1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="50dp"
android:text="."
android:textAlignment="textEnd"
android:textSize="20sp"
android:textStyle="bold" />
<TextView
android:id="#+id/idZoom2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="50dp"
android:background="#drawable/circle_shade"
android:gravity="center"
android:text="1X"
android:textSize="16sp" />
<TextView
android:id="#+id/idZoom3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="."
android:textAlignment="viewStart"
android:textSize="20sp"
android:textStyle="bold" />
</LinearLayout>
Any Idea/Help is greatly appreciated.

You can create it like so:
<RelativeLayout
android:layout_centerInParent="true"
android:layout_width="100dp"
android:layout_height="wrap_content">
<HorizontalScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"/>
</LinearLayout>
</HorizontalScrollView>
<TextView
android:layout_centerInParent="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#000"
android:textColor="#fff"
android:text="1"/>
</RelativeLayout>
Change it as you see fit, basically, the relative layout parent holds within the horizonal scrollable scrollview, within it you have your needed-to-be-scrolled views. After if you define your number view, being inside a relative layout it will simply be ordered above it. You can then center it to appear above your scrollable scrollView.
Do note the following 2 this:
The scroll will only be performed if the user touched the scrollable view. As in, if the user tries to swipe from pressing on the number it self, it will not scroll.
The content behind the number will be hidden behind it, it won't "skip" from 1 side to the other so you can have "invisible" content that way.

can't get a Scroll View to go vertical

Iam currently making a resistor calculator app and have too many radio buttons in the radio group, so I wanted to add a scroll view to make it look nicer but the problem I have is I can't get it to go vertical
I only added one Radio button in this post so the code wouldn't take up to much space.
<HorizontalScrollView
android:layout_width="92dp"
android:layout_height="356dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.648"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:orientation="vertical"
app:layout_constraintVertical_bias="0.93">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="vertical" >
<RadioGroup
android:id="#+id/RadioGroup3"
android:layout_width="104dp"
android:layout_height="386dp">
<RadioButton
android:id="#+id/rbBlack3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Black" />
</RadioGroup>
</LinearLayout>
</HorizontalScrollView>

Android: Placing imageButton over a Button

I would like to place 2 small icons (with actions) over a big Button that take the 1/3 of the screen. The 2 icons and the button have to support actions when we click on them. I'm pretty sure I have to use imageButton for the icons. However I can't find any way to keep the icons (imageButton) on top of the button.
Here is my code:
<RelativeLayout
android:layout_width="match_parent"
android:layout_weight="1"
android:layout_height="0dp">
<ImageButton
android:id="#+id/icon1"
android:src="#drawable/ic1"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:contentDescription="#string/ic1"
android:layout_width="48dp"
android:layout_height="48dp"
android:onClick="action1"/>
<ImageButton
android:id="#+id/icon2"
android:src="#drawable/ic2"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:contentDescription="#string/ic2"
android:layout_width="48dp"
android:layout_height="48dp"
android:onClick="action2"/>
<com.myapp.CustomViews.myButton
android:id="#+id/big_button1"
android:text="#string/text_big_button1"
android:background="#drawable/changing_button1"
android:textColor="#color/white"
android:layout_height="match_parent"
android:textSize="#dimen/font_size_buttons"
android:layout_width="match_parent"
android:gravity="center"
android:textAllCaps="false"
android:capitalize="none"
android:onClick="bigAction1"/>
</RelativeLayout>
The "#drawable/changing_button1" on the big Button allows me to put one color for the button and a different one when focused or pressed.
I tried so many different things and I couldn't find a way while I'm sure there is a simple solution. The icons remain hidden behind the big Button.
Thank you for your help!

You could use FrameLayout to overlay views. For example:
<FrameLayout
android:layout_width="match_parent"
android:layout_weight="1"
android:layout_height="0dp">
<com.myapp.CustomViews.myButton
android:layout_gravitiy="center"
.../>
<ImageButton
android:layout_gravitiy="left|center_vertical"
.../>
<ImageButton
android:layout_gravitiy="right|center_vertical"
.../>
</FrameLayout>

Here is a slightly modified version of your layout, which works fine.
I replaced all your custom stuff with plain android and standard buttons, and moved the big button up in the layout, because if it is at the bottom, it has a higher z-index and overlays the two small buttons.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="#+id/big_button1"
android:text="BIG BUTTON"
android:background="#android:color/holo_blue_dark"
android:textColor="#color/white"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:gravity="center"
android:textAllCaps="false"
android:capitalize="none"
android:onClick="bigAction1"/>
<Button
android:id="#+id/icon1"
android:text="BT1"
android:background="#android:color/holo_red_dark"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_width="48dp"
android:layout_height="48dp"
android:onClick="action1"/>
<Button
android:id="#+id/icon2"
android:text="BT2"
android:background="#android:color/holo_green_dark"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:layout_width="48dp"
android:layout_height="48dp"
android:onClick="action2"/>
</RelativeLayout>

How about changing order in the layout ? Place your Button widget on top, then declare 2 icons after that ?
You should add android:translationZ="5dip" for the 2 imageButton. It works (you should run and see, it didn't appear so on the IDE)

I finally found a way to do it.
The solution is to use the RelativeLayout as a button and replace the Button by a simple TextView:
<RelativeLayout
android:layout_width="match_parent"
android:layout_weight="1"
android:layout_height="0dp"
android:background="#drawable/custom_button_changing_color"
android:clickable="true"
android:focusable="true"
android:id="#+id/button_layout"
android:onClick="bigAction1">
<TextView
android:id="#+id/text_button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/text"
android:gravity="center"
android:layout_centerVertical="true"
android:textColor="#color/white"
android:textSize="#dimen/font_size_buttons"
android:textAllCaps="false"
android:background="#color/transparent"/>
<ImageButton
android:id="#+id/icon1"
android:src="#drawable/ic1"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:contentDescription="#string/ic1"
android:layout_width="48dp"
android:layout_height="48dp"
android:onClick="action2"/>
<ImageButton
android:id="#+id/icon2"
android:src="#drawable/ic2"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:contentDescription="#string/ic2"
android:layout_width="48dp"
android:layout_height="48dp"
android:onClick="action3"/>
</RelativeLayout>
I hope this helps! :)

Elements below the expandable list - not floating footer

Is there any option to put elements below the expandable list, let me explain: I already implemented elements below the list, but they are behaving like footer - floating at the bottom of the screen.
But if i place elements below the list in xml, elements become hidden when any group is expanded.
at the moment my layout is behaving like this
http://shrani.si/f/2s/ba/ga2VKfi/lay2.jpg
but i want to be like this at the end of the list
http://shrani.si/f/42/4m/2GAcNu6T/lay3.jpg
My layout at the moment
<LinearLayout
android:id="#+id/linearLayoutListExer"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dip"
android:background="#ffffff"
android:gravity="center_vertical"
android:orientation="vertical">
<ExpandableListView
android:id="#+id/ExerciseELV"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/linearLayoutStatus"
android:layout_weight="1"
android:groupIndicator="#null" />
<LinearLayout
android:id="#+id/relativeFooter"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="#id/linearLayoutListExer"
android:background="#ffffff"
android:orientation="vertical">
<TextView
android:id="#+id/textViewBellowExercise"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="10dip"
android:text="The following exercises will help you lose body weight"
android:textAppearance="?android:attr/textAppearanceSmall"
/>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="#id/textViewBellowExercise">
<Button
android:id="#+id/buttonFaceit"
android:layout_width="0dp"
android:layout_height="20dp"
android:layout_margin="5dp"
android:layout_weight="1"
android:background="#color/green"
android:text="FaceIT!"
android:textColor="#color/white" />
<Button
android:id="#+id/buttonChallenge"
android:layout_width="0dp"
android:layout_height="20dp"
android:layout_margin="5dp"
android:layout_weight="1"
android:background="#color/red"
android:text="Challenge"
android:textColor="#color/white" />
</LinearLayout>
</LinearLayout>
</LinearLayout>

Your following property should change.
Instead of
android:layout_below="#id/linearLayoutListExer"
you should write
android:layout_below="#id/ExerciseELV"
for the LinearLayout with android:id="#+id/relativeFooter"
This will make the bottom layout appear below the listview

I'm new to android so i'm sorry for any "stupid" questions i may be asking.
I ended up using addfooterview method which works great.
You need to separate footer layout in its own xml and then inflate it and add it to expandable listview.
View footer=inflater.inflate(R.layout.activity_main_footer,null);
elv.addFooterView(footer);

toRightOf not working as expected in an android layout

Here is my layout:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/outerBox"
android:layout_width="wrap_content"
android:layout_height="fill_parent" >
<GridLayout
android:id="#+id/checksHere"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:columnCount="5"
android:columnWidth="100dp" />
<GridLayout
android:id="#+id/textHere"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="#id/checksHere"
android:columnCount="4" />
<Button
android:id="#+id/submitButton"
android:layout_width="185dip"
android:layout_height="wrap_content"
android:layout_alignLeft="#id/outerBox"
android:layout_below="#id/textHere"
android:layout_margin="3dip"
android:onClick="submit"
android:text="#string/submit" />
<Button
android:id="#+id/cancelButton"
android:layout_width="185dip"
android:layout_height="wrap_content"
android:layout_below="#id/textHere"
android:layout_margin="3dip"
android:layout_toRightOf="#id/submitButton"
android:onClick="next"
android:text="#string/cancel" />
<Button
android:id="#+id/backButton"
android:layout_width="185dip"
android:layout_height="wrap_content"
android:layout_below="#id/textHere"
android:layout_margin="3dip"
android:layout_toRightOf="#id/cancelButton"
android:onClick="next"
android:text="test" />
</RelativeLayout>
I have a relative layout. The layout has two grid layouts at the top, which can be populated in my java code with text or checks. They can be blank. Then I have three buttons. The first two buttons display on the screen just fine. The third button just sits on top of the first button:
I changed the third button (backButton) to be toRightOf submitButton just to see what would happen. It goes on top of the cancelButton, as expected. I feel like I'm missing a simple fundamental, but I have not been able to figure it out.

Well this doesn't necessarily fix the problem with RelativeLayout, but you could always group the three buttons together in a single LinearLayout. This should prevent the buttons from overlapping.

I am not sure but when testing in eclipse changing all the android:layout_width="185dip" to android:layout_width="wrap_content" for buttons worked for me.