Layout main code

Activity_main:

<relativelayout xmlns:android= "Http://schemas.android.com/apk/res/android"
Xmlns:tools= "Http://schemas.android.com/tools"
Android:id= "@+id/container"
Android:layout_width= "Match_parent"
android:layout_height= "Match_parent"
android:orientation= "Vertical"
android:background= "@drawable/bg2" >

<button android:id= "@+id/button2" android:layout_width= "fill_parent" android:layout_height= "Wra P_content "android:layout_alignparentleft=" true "android:layout_below=" @+id/button1 "android:text= "Wrong problem consolidation"/>

<button android:id= "@+id/button3" android:layout_width= "fill_parent" android:layout_height= "Wra P_content "android:layout_alignparentleft=" true "android:layout_below=" @+id/button2 "android:text= "Exit"/>

<button android:id= "@+id/button1" android:layout_width= "fill_parent" android:layout_height= "Wra P_content "android:layout_alignparentleft=" true "android:layout_alignparenttop=" true "Android:layo ut_margintop= "148DP" android:text= "Start"/>

</RelativeLayout>

Cal_main:

<?xml version= "1.0" encoding= "Utf-8"?
<relativelayout xmlns:android= "http://schemas.android.com/ Apk/res/android "
    android:id=" @+id/relativelayout1 "
    android:layout_ Width= "Match_parent"
    android:layout_height= "match_parent"
    android: background= "@drawable/bg2"
    android:orientation= "vertical";

<button
Android:id= "@+id/button4"
Android:layout_width= "Match_parent"
android:layout_height= "Wrap_content"
Android:layout_above= "@+id/textview2"
Android:layout_alignparentleft= "true"
Android:layout_marginbottom= "18DP"
android:text= "OK"/>

<textview

Android:id= "@+id/textview1"

Android:layout_width= "Fill_parent"

Android:layout_height= "50DP

"Android:layout_above=" @+id/edittext1 "

Android:layout_centerhorizontal= "true"

Android:layout_marginbottom= "30DP"

android:gravity= "Center"

Android:textsize= "20px"

Android:editable= "true"/>

<edittext

Android:id= "@+id/edittext1"

Android:layout_width= "Wrap_content"

android:layout_height= "50DP"

Android:layout_above= "@+id/button4"

Android:layout_centerhorizontal= "true"

Android:digits= "1234567890.-"

Android:ems= "10"

android:numeric= "Decimal" >

<textview

Android:id= "@+id/textview2"

Android:layout_width= "230DP"

android:layout_height= "70DP"

Android:layout_alignparentbottom= "true"

Android:layout_alignparentright= "true"

Android:layout_marginbottom= "135DP"

Android:editable= "true"

Android:textsize= "20px"/>

<imageview

Android:id= "@+id/imageview1"

Android:layout_width= "Wrap_content"

android:layout_height= "Wrap_content"

Android:layout_alignbottom= "@+id/textview2"

android:layout_aligntop= "@+id/textview2"

Android:layout_alignparentleft= "true"

android:layout_toleftof= "@+id/textview2"/>

</RelativeLayout>

<requestfocus/>

</EditText>

Show_main:

<?xml version= "1.0" encoding= "Utf-8"?>
<linearlayout xmlns:android= "Http://schemas.android.com/apk/res/android"
Android:id= "@+id/linearlayout1"
Android:layout_width= "Match_parent"
android:layout_height= "Match_parent"
android:orientation= "Vertical"
android:background= "@drawable/bg2" >

<linearlayout
Android:layout_width= "Fill_parent"
android:layout_height= "Wrap_content"
android:orientation= "Vertical"
android:layout_gravity= "Center" >

<linearlayout
Android:layout_width= "Match_parent"
android:layout_height= "Wrap_content"
android:layout_gravity= "Center" >

            <textview
                 android:id= "@+id/textview1"
                 android:layout_width= "93DP "
                Android:layout_ height= "Wrap_content"
                 android:editable= "true"
                 android:text= ""/>

            <edittext
                 android:id= "@+id/edittext1"
                 android:layout_width= "Wrap _content "
                Android : layout_height= "wrap_content"
                 android:digits= "1234567890.-"
                 android:ems= "Ten"
                 android:numeric= "decimal"
                 android:text= "";

<requestfocus/>
</EditText>
</LinearLayout>

<button
Android:id= "@+id/button6"
Android:layout_width= "Match_parent"
android:layout_height= "Wrap_content"
android:text= "OK"/>
<button
Android:id= "@+id/button7"
Android:layout_width= "Match_parent"
android:layout_height= "Wrap_content"
android:text= "Next question"/>
<button

Android:id= "@+id/button8"
        android:layout_width= "Match_parent"
        android:layout_height= "wrap_content"
         android:text= "Delete from wrong question bank"/>
        <button
         android:id= "@+id/button9"
        Android:layout_width= "Match_parent"
        android:layout_height= "Wrap_ Content "
        android:text=" returns "/>
  <linearlayout
       android:layout_width= "fill_parent"
       android:layout_height= "Match_parent"
      android:orientation= "Horizontal";
            <imageview

Android:id= "@+id/imageview2"

Android:layout_width= "Fill_parent"

android:layout_height= "70DP"

android:layout_weight= "5"/>

<textview

Android:id= "@+id/textview2"

Android:layout_width= "Fill_parent"

android:layout_height= "70DP"

android:layout_weight= "3"

Android:editable= "true"

android:text= ""/>

</LinearLayout>

</LinearLayout>

</LinearLayout>

Layout main code