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how to allow only one radiobtton to be executed in a radiogroup inside a linear layout?

I am trying to place a radio group with 3 radio buttons inside a linear layout. My aim is to choose only one RadioButton inside the RadioGroup but, it is giving me an error that there are multiple root tags. Can someone figure out how to solve this?
file.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/linearLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="ok"
android:id="#+id/textemail"/>
<RadioGroup
android:layout_width="match_parent"
android:layout_height="match_parent">
<RadioButton
android:id="#+id/one"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="one" />
<RadioButton
android:id="#+id/two"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="two"
/>
<RadioButton
android:id="#+id/three"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="three" />
</RadioGroup>
<TextView
android:id="#+id/textView1"
android:layout_below="#+id/textemail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="To:"
/>
<TextView
android:id="#+id/TextTo"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="khushi"/>
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Comment:"
/>
<TextView
android:id="#+id/TextS3"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="your comment"
/>
<TextView
android:id="#+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="email us "
android:textAppearance="?android:attr/textAppearanceLarge" />
<EditText
android:id="#+id/editText"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="top"
android:inputType="textMultiLine"
android:lines="10" />
<Button
android:id="#+id/button"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Send"
android:textStyle="italic"/>
</LinearLayout>

You immediately close your radiogroup:
<RadioGroup
android:layout_width="match_parent"
android:layout_height="match_parent"/>
This should be:
<RadioGroup
android:layout_width="match_parent"
android:layout_height="match_parent"> // Note that there is no forward slash at the end
And you are not closing the RadioGroup:
</RadioButton> <-- This should be </RadioGroup>

Your RadioButton (views) should be children of the RadioGroup(view). By closing your RadioGroup using /> you declare the RadioButton(s) and the RadioGroup as children of the LinearLayout.
The Following should work.
<?xml version="1.0" encoding="utf-8"?>
<Linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/linearLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="hello"
android:id="#+id/textview"/>
<RadioGroup
android:layout_width="match_parent"
android:layout_height="match_parent">
<RadioButton
android:id="#+id/one"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="one" />
<RadioButton
android:id="#+id/two"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="two"
/>
<RadioButton
android:id="#+id/three"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="three" />
</RadioButton>
</RadioGroup>
<TextView
android:id="#+id/textViewllol"
android:layout_below="#+id/textemail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="hi:"
/>
<TextView
android:id="#+id/Texme"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text=""
/>
<TextView
android:id="#+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="comment:"
/>
<TextView
android:id="#+id/Text2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="your comments"
/>
<TextView
android:id="#+id/textView45"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="ok"
/>
<EditText
android:id="#+id/editTextMessage"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="top"
android:lines="10" />
<Button
android:id="#+id/button4785"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="send"
/>
</LinearLayout>

Change below -
<RadioGroup
android:layout_width="match_parent"
android:layout_height="match_parent"/>
to
<RadioGroup
android:layout_width="match_parent"
android:layout_height="match_parent">
<RadioButton
android:id="#+id/one"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="one" />
<RadioButton
android:id="#+id/two"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="two"
/>
<RadioButton
android:id="#+id/three"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="three" />
</RadioGroup>
One of your Text is not in correct format change it as below -
<TextView
android:id="#+id/textView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="ok:"
/>
to
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="ok:"
/>
One more error -
change below -
<RadioGroup
android:layout_width="match_parent"
android:layout_height="match_parent">
to
<RadioGroup
android:layout_width="match_parent"
android:layout_height="wrap_content">

You have one </Radiobutton> tag above </Radiogroup> that shouldn't be here. Just remove it to have :
<RadioGroup
android:layout_width="match_parent"
android:layout_height="match_parent">
<RadioButton
android:id="#+id/one"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="one" />
<RadioButton
android:id="#+id/two"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="two"
/>
<RadioButton
android:id="#+id/three"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="three" />
</RadioGroup>

Show many radio buttons

I have 7 radio buttons under one radio group. I rendered them horizontally using orientation = "horizontal". But only 4 can be visible at a time, rest are not.
Is there any way that I could show rest of them in second row while keeping all these 'Radiobuttons' in one 'RadioGroup`?
In case you need my code -
<RadioGroup
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1 BHK" />
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1.5 BHK" />
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2 BHK" />
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2.5 BHK" />
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2 BHK" />
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2.5 BHK" />
</RadioGroup>

You can't place RadioButtons at different places on the screen while keeping them in the same RadioGroup. You can't keep them in different rows either (like you want to achieve). Yes, I hate it too.
You can make checkboxes intead, place them the way you want, and then use setOnCheckedChangedListener on each of them. So if one of them is checked, call setChecked(false) on the others.
Use custom drawable so that they look like radio buttons and not checkboxes.

You can use scrollview inside a radio group like this
<RadioGroup
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<HorizontalScrollView
android:id="#+id/ScrlView"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1 BHK" />
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1.5 BHK" />
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2 BHK" />
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2.5 BHK" />
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2 BHK" />
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2.5 BHK" />
</ScrollView>
</RadioGroup>

I guess, there is not enough place for all of them. Try to set android:layout_width="0dp" and android:layout_weight="1" to all RadioButtons. But it can be not very beautiful.

Try to set width for all Radiobutton
android:layout_width="0dp"
And also add android:layout_weight="1" for every Radio Button.
ex
<RadioButton
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="1 BHK"
android:layout_weight="1"/>

Replace below code from your xml code
<HorizontalScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<RadioGroup
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1 BHK" />
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1.5 BHK" />
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2 BHK" />
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2.5 BHK" />
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2 BHK" />
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2.5 BHK" />
</RadioGroup>
</LinearLayout>
</HorizontalScrollView>

i also try this within RadioGroup and you can select only one at a time it works nice :
<RadioGroup
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<RadioButton android:layout_height="match_parent" >
</RadioButton>
<RadioButton android:layout_height="match_parent" >
</RadioButton>
<RadioButton android:layout_height="match_parent" >
</RadioButton>
<RadioButton android:layout_height="match_parent" >
</RadioButton>
<RadioButton android:layout_height="match_parent" >
</RadioButton>
<RadioButton android:layout_height="match_parent" >
</RadioButton>
<RadioButton android:layout_height="match_parent" >
</RadioButton>
</RadioGroup>

My solution to this is to add a LinearLayout inside your RadioGroup layout.
I changed the orientation of the RadioGroup to vertical and added
two LinearLayout with horizontal orientation which will server as rows.
<RadioGroup
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1 BHK" />
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1.5 BHK" />
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2 BHK" />
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2.5 BHK" />
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="3 BHK" />
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="3.5 BHK" />
</LinearLayout>
</RadioGroup>

RadioButton in multirow in single RadioGroup

I need to create design like radiobutton in multi-row in single radiogroup like this image .
I am using android:orientation="horizontal"
layout.xml
<RadioGroup
android:id="#+id/radiogroup"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:orientation="horizontal" >
<RadioButton
android:id="#+id/option1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="true"
android:singleLine="false"
android:text="option1" />
<RadioButton
android:id="#+id/option2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="true"
android:singleLine="false"
android:text="option2" />
<RadioButton
android:id="#+id/option3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="true"
android:singleLine="false"
android:text="option3" />
<RadioButton
android:id="#+id/option4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="true"
android:singleLine="false"
android:text="option4" />
<RadioButton
android:id="#+id/option5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="true"
android:singleLine="false"
android:text="option5" />
<RadioButton
android:id="#+id/option6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="true"
android:singleLine="false"
android:text="option6" />
</RadioGroup>
Thanks..

parent can be any like linear horizontal or relative(i'd prefer Linear Horizontal), inside that 3 TableRow childs,within each tableRow your RadioButtons. something like this
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<TableRow android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
<RadioGroup>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Radio1"
/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Radio2"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Radio3"/>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Radio4"
/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Radio5"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Radio6"/>
</LinearLayout>
</RadioGroup>
</TableRow>
<TableRow android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
<RadioGroup>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Radio1"
/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Radio2"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Radio3"/>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Radio4"
/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Radio5"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Radio6"/>
</LinearLayout>
</RadioGroup>
</TableRow>

What you are trying to achieve is possible.
You will have to subclass TableLayout and add the radio buttons programmatically
here is the link
refer this MATRIX RADIO BUTTONS
For screen width
Screen Width

Android:placing the radio buttons horizontally

Below is my Relative layout..i am trying to place the radio buttons above the edittext
<?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="wrap_content"
android:background="#FFFFFF" >
<ImageView
android:id="#+id/fbreplycancel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:src="#drawable/fbcancel" />
<RelativeLayout
android:id="#+id/relativeLayout1"
android:layout_width="80dp"
android:layout_height="250dp"
android:layout_alignParentRight="true"
android:layout_below="#+id/fbcancel" >
<Spinner
android:id="#+id/replyspinner"
android:layout_width="50dp"
android:layout_height="30dp"
android:layout_alignLeft="#+id/fbshare"
android:layout_alignRight="#+id/fbshare"
android:layout_below="#+id/fbshare"
android:layout_marginTop="16dp"
android:drawSelectorOnTop="true"
android:entries="#array/fbcommentlist"
android:visibility="gone" />
<Button
android:id="#+id/fbshare"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:background="#drawable/fbbuttons"
android:text="#string/share" />
<ImageView
android:id="#+id/fbpeople"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/fbshare"
android:layout_centerHorizontal="true"
android:layout_marginBottom="19dp"
android:background="#drawable/people2"
android:drawSelectorOnTop="true"
android:paddingTop="20dp" />
<RadioButton
android:id="#+id/radio2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:text="RadioButton" />
</RelativeLayout>
<View
android:layout_width="250dp"
android:layout_height="0.7dip"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="#+id/imageView1"
android:background="#3b5998" />
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/fbcancel"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:paddingRight="2dp"
android:src="#drawable/askabud" />
<TextView
android:id="#+id/fbcommentpostedby"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/fbedittext"
android:layout_alignRight="#+id/fbcommentdisplay"
android:layout_below="#+id/imageView1"
android:layout_marginTop="15dp"
android:textColor="#000000" />
<TextView
android:id="#+id/fbcommentdisplay"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/fbedittext"
android:layout_below="#+id/fbcommentpostedby"
android:layout_toLeftOf="#+id/relativeLayout1"
android:textColor="#000000" />
<TextView
android:id="#+id/fbtextview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/imageView1"
android:layout_toLeftOf="#+id/fbreplycancel"
android:layout_toRightOf="#+id/imageView1"
android:text="#string/replyrecommend"
android:textSize="18sp"
android:textColor="#000000"/>
<TextView
android:id="#+id/fbplacename"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/fbcommentdisplay"
android:layout_alignRight="#+id/fbcommentdisplay"
android:layout_below="#+id/fbcommentdisplay"
android:textColor="#000000" />
<EditText
android:id="#+id/fbedittext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="#+id/fbplacename"
android:layout_marginLeft="19dp"
android:layout_marginTop="45dp"
android:layout_toLeftOf="#+id/relativeLayout1"
android:background="#drawable/roundcorners"
android:ems="10"
android:hint="#string/fbhint"
android:lines="6"
android:scrollHorizontally="true"
android:textSize="14sp"
android:windowSoftInputMode="stateHidden" />
<RadioGroup
android:id="#+id/radioGroup1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="#+id/fbplacename" >
<RadioButton
android:id="#+id/radio0"
android:layout_width="30dp"
android:layout_height="30dp"
android:checked="true"
android:text="1"
/>
</RadioGroup>
<RadioGroup
android:id="#+id/radioGroup2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="#+id/radioGroup1"
android:layout_toLeftOf="#+id/relativeLayout1" >
<RadioButton
android:id="#+id/radio0"
android:layout_width="26dp"
android:layout_height="wrap_content"
android:checked="true"
android:text="3" />
<RadioButton
android:id="#+id/radio2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="RadioButton" />
</RadioGroup>
<RadioButton
android:id="#+id/radio1"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_alignTop="#+id/radioGroup2"
android:layout_toLeftOf="#+id/radioGroup2"
android:text="2" />
</RelativeLayout>
Iam facing a hard time to arrange them horizontally.Any help is appreciated.

To place a radiogroup (or any other view) above other just do:
android:layout_above="#+id/view_below"
To change the orientation just set:
android:orientation="horizontal"
And to give equal width to items make use of layout_weight:
<RadioGroup
android:id="#+id/radio_group"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_above="#+id/view_below" >
<RadioButton
android:id="#+id/radio1"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:checked="true"
android:text="First" />
<RadioButton
android:id="#+id/radio2"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:text="Second" />
</RadioGroup>

You can use table layout instead of relative layout. Insert row into into table layout and place radio buttons inside table row..
For equal spacing follow following procedure
<TableRow
android:id="#+id/tableRow2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="50dp" >
<RadioButton
android:id="#+id/button2"
android:layout_width="5dp"
android:layout_height="60dp"
android:layout_weight="1"
android:text="#string/btnReject"
android:onClick="onCallRejectButton" />
<RadioButton
android:id="#+id/button1"
android:layout_width="5dp"
android:layout_height="60dp"
android:layout_weight="1
android:onClick="onCallAcceptButton"
android:text="#string/btnAccept" />
</TableRow>

android:orientation="horizontal" just do this. Type the orientation horizontal property to the radiogroup tag
<RadioGroup
android:id="#+id/radio"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<RadioButton
android:id="#+id/radioMale"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Male"
android:checked="true" />
<RadioButton
android:id="#+id/radioFemale"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Female" />
</RadioGroup>

You just need to put Radio Group orientation to horizontal.
<RadioGroup
android:id="#+id/radio_group_forgot_password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
**android:orientation="horizontal"**
>

ViewFliper in layout

i am doing one application in android but i have one problem in layout file
i am doing by viewFliper
here is code
<?xml version="1.0" encoding="utf-8"?>
<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" >
<TextView
android:id="#+id/Quesiontext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginTop="44dp"
android:text="#string/Question"
android:textSize="18sp" />
<RadioGroup
android:id="#+id/radioGroupOptions"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="#+id/Quesiontext"
android:layout_marginTop="30dp" >
<RadioButton
android:id="#+id/optionOne"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="false"
android:text="#string/option1" />
<RadioButton
android:id="#+id/optionTwo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/option2" />
<RadioButton
android:id="#+id/optionthree"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/option3" />
<RadioButton
android:id="#+id/optionFour"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/option4" />
</RadioGroup>
<TextView
android:id="#+id/corrertView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_below="#+id/radioGroupOptions"
android:layout_marginRight="48dp"
android:text="#string/correct" />
<Button
android:id="#+id/btnNext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/corrertView"
android:layout_below="#+id/corrertView"
android:layout_marginTop="42dp"
android:text="#string/Next"
android:textSize="16sp" />
<Button
android:id="#+id/Btnpervious"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/btnNext"
android:layout_alignBottom="#+id/btnNext"
android:layout_alignParentLeft="true"
android:text="#string/Pervious"
android:textSize="16sp" />
<RelativeLayout
android:id="#+id/layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ViewFlipper
android:id="#+id/ViewFlipper01"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="#+id/Quesiontext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginTop="44dp"
android:text="#string/Question"
android:textSize="18sp" />
<RadioGroup
android:id="#+id/radioGroupOptions"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="#+id/Quesiontext"
android:layout_marginTop="30dp" >
<RadioButton
android:id="#+id/optionOne"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="false"
android:text="#string/option1" />
<RadioButton
android:id="#+id/optionTwo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/option2" />
<RadioButton
android:id="#+id/optionthree"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/option3" />
<RadioButton
android:id="#+id/optionFour"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/option4" />
</RadioGroup>
<TextView
android:id="#+id/corrertView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_below="#+id/radioGroupOptions"
android:layout_marginRight="48dp"
android:text="#string/correct" />
</ViewFlipper>
</RelativeLayout>
</RelativeLayout>
i didnt get it that how i put another button into ViewFliper ..its confusion and generating error...

You haven't closed your ViewFlipper with </ViewFlipper>

Could this be what you are looking for,
android:id="#+id/layout"
You missed a "+" symbol while creating a id.