ScrollView won't scroll

ScrollView won't scroll - android

I am new to Android Programming(started yesterday, infact) and I cannot, for the life of me, get ScrollView to scroll. I have a bunch of buttons which won't all fit on the screen, so I tried to add a scroll function. However, this doesn't work. I am running an emulator if that helps. Here is my XML:
<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=".UnleashedMainPageActivity" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/unleashed_Main" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/textView1"
android:layout_below="#+id/textView1"
android:text="#string/choose_Mod" />
<Button
android:id="#+id/button4"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/textView2"
android:layout_alignRight="#+id/textView2"
android:layout_below="#+id/textView2"
android:text="Applied Energistics" />
<Button
android:id="#+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button4"
android:layout_alignRight="#+id/button4"
android:layout_below="#+id/button4"
android:text="Buildcraft" />
<Button
android:id="#+id/button2"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button1"
android:layout_alignRight="#+id/button1"
android:layout_below="#+id/button1"
android:text="Computer Craft" />
<Button
android:id="#+id/button3"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button2"
android:layout_alignRight="#+id/button2"
android:layout_below="#+id/button2"
android:text="Ender Storage" />
<Button
android:id="#+id/button5"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button3"
android:layout_alignRight="#+id/button3"
android:layout_below="#+id/button3"
android:text="Equivalent Exchange 3" />
<Button
android:id="#+id/button6"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button5"
android:layout_alignRight="#+id/button5"
android:layout_below="#+id/button5"
android:text="ExtraBiomes/Biomes O' Plenty" />
<Button
android:id="#+id/button7"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button6"
android:layout_alignRight="#+id/button6"
android:layout_below="#+id/button6"
android:text="Factorization" />
<Button
android:id="#+id/button8"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button7"
android:layout_alignRight="#+id/button7"
android:layout_below="#+id/button7"
android:text="Forestry" />
<Button
android:id="#+id/button9"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button8"
android:layout_alignRight="#+id/button8"
android:layout_below="#+id/button8"
android:text="IndustrialCraft 2" />
<Button
android:id="#+id/button10"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button9"
android:layout_alignRight="#+id/button9"
android:layout_below="#+id/button9"
android:text="MineFactory Reloaded" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/button10"
android:layout_alignLeft="#+id/button4"
android:layout_alignTop="#+id/button4"
android:orientation="vertical" >
<ScrollView
android:id="#+id/scrollView1"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
</LinearLayout>
</ScrollView>
</LinearLayout>
</RelativeLayout>

replace :
<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=".UnleashedMainPageActivity" >
<ScrollView
android:id="#+id/scrollView1"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/unleashed_Main" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/textView1"
android:layout_below="#+id/textView1"
android:text="#string/choose_Mod" />
<Button
android:id="#+id/button4"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/textView2"
android:layout_alignRight="#+id/textView2"
android:layout_below="#+id/textView2"
android:text="Applied Energistics" />
<Button
android:id="#+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button4"
android:layout_alignRight="#+id/button4"
android:layout_below="#+id/button4"
android:text="Buildcraft" />
<Button
android:id="#+id/button2"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button1"
android:layout_alignRight="#+id/button1"
android:layout_below="#+id/button1"
android:text="Computer Craft" />
<Button
android:id="#+id/button3"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button2"
android:layout_alignRight="#+id/button2"
android:layout_below="#+id/button2"
android:text="Ender Storage" />
<Button
android:id="#+id/button5"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button3"
android:layout_alignRight="#+id/button3"
android:layout_below="#+id/button3"
android:text="Equivalent Exchange 3" />
<Button
android:id="#+id/button6"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button5"
android:layout_alignRight="#+id/button5"
android:layout_below="#+id/button5"
android:text="ExtraBiomes/Biomes O' Plenty" />
<Button
android:id="#+id/button7"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button6"
android:layout_alignRight="#+id/button6"
android:layout_below="#+id/button6"
android:text="Factorization" />
<Button
android:id="#+id/button8"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button7"
android:layout_alignRight="#+id/button7"
android:layout_below="#+id/button7"
android:text="Forestry" />
<Button
android:id="#+id/button9"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button8"
android:layout_alignRight="#+id/button8"
android:layout_below="#+id/button8"
android:text="IndustrialCraft 2" />
<Button
android:id="#+id/button10"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button9"
android:layout_alignRight="#+id/button9"
android:layout_below="#+id/button9"
android:text="MineFactory Reloaded" />
</LinearLayout>
</ScrollView>
</RelativeLayout>

at first you don't have close tag for RelativeLayout.
and if you want scrollview work then you have to insert enough views in scrollview for fill screen height

Related

Android:how make responsive xml

i want create a password activity to get password then show main activity i make the xml file like this
this is my xml
<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="ir.sheikhoo.safesms.LoginActivity"
android:background="#373737" >
<EditText
android:id="#+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button1"
android:layout_alignParentTop="true"
android:layout_alignRight="#+id/button3"
android:ems="10"
android:inputType="textPassword" >
<requestFocus />
</EditText>
<Button
android:id="#+id/button2"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="#+id/button1"
android:layout_centerHorizontal="true"
android:text="8" />
<Button
android:id="#+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/editText1"
android:layout_marginTop="21dp"
android:layout_toLeftOf="#+id/button2"
android:text="7" />
<Button
android:id="#+id/button3"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/button2"
android:layout_alignBottom="#+id/button2"
android:layout_toRightOf="#+id/button2"
android:text="9" />
<Button
android:id="#+id/button4"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/button2"
android:layout_toLeftOf="#+id/button2"
android:text="4" />
<Button
android:id="#+id/button5"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/button2"
android:layout_toLeftOf="#+id/button3"
android:text="5" />
<Button
android:id="#+id/button6"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/button5"
android:layout_alignBottom="#+id/button5"
android:layout_alignLeft="#+id/button3"
android:text="6" />
<Button
android:id="#+id/button7"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button4"
android:layout_below="#+id/button4"
android:text="1" />
<Button
android:id="#+id/button8"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/button7"
android:layout_alignBottom="#+id/button7"
android:layout_toLeftOf="#+id/button6"
android:text="2" />
<Button
android:id="#+id/button9"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button6"
android:layout_alignTop="#+id/button8"
android:text="3" />
<Button
android:id="#+id/button10"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button7"
android:layout_alignRight="#+id/button9"
android:layout_below="#+id/button8"
android:text="0" />
</RelativeLayout>
this is image
or this
<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="ir.sheikhoo.safesms.LoginActivity"
android:background="#373737" >
<EditText
android:id="#+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:ems="10"
android:inputType="textPassword" >
<requestFocus />
</EditText>
<Button
android:id="#+id/button3"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/button2"
android:layout_alignBottom="#+id/button2"
android:layout_alignParentRight="true"
android:text="9" />
<Button
android:id="#+id/button6"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/button5"
android:layout_alignBottom="#+id/button5"
android:layout_alignLeft="#+id/button3"
android:text="6" />
<Button
android:id="#+id/button7"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button4"
android:layout_below="#+id/button4"
android:text="1" />
<Button
android:id="#+id/button9"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button6"
android:layout_alignTop="#+id/button8"
android:text="3" />
<Button
android:id="#+id/button10"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button7"
android:layout_alignRight="#+id/button9"
android:layout_below="#+id/button8"
android:text="0" />
<Button
android:id="#+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/button2"
android:layout_alignBottom="#+id/button2"
android:layout_alignLeft="#+id/editText1"
android:text="7" />
<Button
android:id="#+id/button4"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/button5"
android:layout_alignBottom="#+id/button5"
android:layout_alignLeft="#+id/button1"
android:text="4" />
<Button
android:id="#+id/button5"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button2"
android:layout_below="#+id/button2"
android:text="5" />
<Button
android:id="#+id/button8"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/button7"
android:layout_alignBottom="#+id/button7"
android:layout_alignLeft="#+id/button5"
android:text="2" />
<Button
android:id="#+id/button2"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/editText1"
android:layout_centerHorizontal="true"
android:layout_marginTop="31dp"
android:text="8" />
</RelativeLayout>
but I want the button width change when the screen change size and fill all screen

Try this,
<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="ir.sheikhoo.safesms.LoginActivity"
android:background="#373737" >
<EditText
android:id="#+id/editText1"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:ems="10"
android:inputType="textPassword" >
<requestFocus />
</EditText>
<Button
android:id="#+id/button3"
style="?android:attr/buttonStyleSmall"
android:layout_marginRight="10dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/button2"
android:layout_alignBottom="#+id/button2"
android:layout_alignParentRight="true"
android:text="9" />
<Button
android:id="#+id/button6"
style="?android:attr/buttonStyleSmall"
android:layout_marginRight="10dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/button5"
android:layout_alignBottom="#+id/button5"
android:layout_alignLeft="#+id/button3"
android:text="6" />
<Button
android:id="#+id/button7"
style="?android:attr/buttonStyleSmall"
android:layout_marginLeft="10dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/button4"
android:text="1" />
<Button
android:id="#+id/button9"
style="?android:attr/buttonStyleSmall"
android:layout_marginRight="10dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button6"
android:layout_alignTop="#+id/button8"
android:text="3" />
<Button
android:id="#+id/button10"
style="?android:attr/buttonStyleSmall"
android:layout_width="match_parent"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_height="wrap_content"
android:layout_below="#+id/button8"
android:text="0" />
<Button
android:id="#+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_marginLeft="10dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/button2"
android:text="7" />
<Button
android:id="#+id/button4"
style="?android:attr/buttonStyleSmall"
android:layout_marginLeft="10dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/button5"
android:layout_alignBottom="#+id/button5"
android:text="4" />
<Button
android:id="#+id/button5"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_alignLeft="#+id/button2"
android:layout_below="#+id/button2"
android:text="5" />
<Button
android:id="#+id/button8"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/button7"
android:layout_alignBottom="#+id/button7"
android:layout_centerHorizontal="true"
android:layout_alignLeft="#+id/button5"
android:text="2" />
<Button
android:id="#+id/button2"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/editText1"
android:layout_centerHorizontal="true"
android:layout_marginTop="31dp"
android:text="8" />
</RelativeLayout>

You can use LinearLayout's "weight" attribute for this design. So create a new folder duplicate layout in this directory (create if doesn't exist in) : /res/layout-land.
I just show you the first line of the three buttons, i.e. button 7, 8 and 9:
<LinearLayout android:layout_height="wrap_content"
android:layout_width="match_parent"
android:orientation="horizontal"
android:layout_below="#+id/editText">
<Button android:id="#+id/btn7
android:layout_weight="1"
... />
<Button android:id="#+id/btn8
android:layout_weight="1"
... />
<Button android:id="#+id/btn9
android:layout_weight="1"
... />
</LinearLayout>
Don't forget to set configChanges="orientation" in manifest.

Improper alignment of buttons in RelativeLayout

I used several RelativeLayouts within one LinearLayout. And the RelativeLayout used for buttons caused improper appearance as seen below:
This is my .xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/ll1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/wood"
android:orientation="vertical"
android:padding="25dp" >
<RelativeLayout
android:id="#+id/relative"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<Button
android:id="#+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="Button" />
<Button
android:id="#+id/button2"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toRightOf="#+id/button1"
android:text="Button" />
<Button
android:id="#+id/button3"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toRightOf="#+id/button2"
android:text="Button" />
<Button
android:id="#+id/button4"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text="Button" />
</RelativeLayout>
<RelativeLayout
android:id="#+id/relative2"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<Button
android:id="#+id/btn5"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="Button" />
<Button
android:id="#+id/btn8"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text="Button" />
<Button
android:id="#+id/btn7"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toLeftOf="#+id/btn8"
android:text="Button" />
<Button
android:id="#+id/btn6"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toLeftOf="#+id/btn7"
android:text="Button" />
</RelativeLayout>
</LinearLayout>
How can I align my buttons properly and nicely without using Grid View since it requires additional library and API 14 and above? Thank you.

Instead of RelativeLayouts use LinearLayouts horizontally oriented:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/ll1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/wood"
android:orientation="vertical"
android:padding="25dp" >
<LinearLayout
android:id="#+id/relative"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="#+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:id="#+id/button2"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:id="#+id/button3"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:id="#+id/button4"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
</LinearLayout>
<LinearLayout
android:id="#+id/relative2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="#+id/btn5"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:id="#+id/btn8"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:id="#+id/btn7"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:id="#+id/btn6"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
</LinearLayout>
</LinearLayout>

How to set 4 button in centerHorizontal in Relative Layout

I want to set 4 button in center Horizontal in a Layout...
Like that
Here is my screenshot!
https://www.dropbox.com/s/td9r52pagi9kwco/qs.png

This works for you :
<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:gravity="center_horizontal"
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="2" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="3" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="4" />
</LinearLayout>

Use this one...
<?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" >
<RelativeLayout
android:id="#+id/relative_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true" >
</RelativeLayout>
<Button
android:id="#+id/button3"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/button2"
android:layout_alignBottom="#+id/button2"
android:layout_alignLeft="#+id/relative_1"
android:text="3" />
<Button
android:id="#+id/button2"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/button1"
android:layout_alignBottom="#+id/button1"
android:layout_toLeftOf="#+id/button3"
android:text="2" />
<Button
android:id="#+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="28dp"
android:layout_toLeftOf="#+id/button2"
android:text="1" />
<Button
android:id="#+id/button4"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/button3"
android:layout_alignBottom="#+id/button3"
android:layout_toRightOf="#+id/button3"
android:text="4" />

wrap all Button in LinearLayout and put LinearLayout in RelativeLayout if you really wish to use RelativeLayout

Try This :
<?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" >
<RelativeLayout
android:id="#+id/relative_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true" >
<Button
android:id="#+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button1" />
<Button
android:id="#+id/button2"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/button1"
android:text="Button2" />
<Button
android:id="#+id/button3"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/button2"
android:text="Button3" />
<Button
android:id="#+id/button4"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/button3"
android:text="Button4" />
</RelativeLayout>
</RelativeLayout>

Try this code:
<?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:orientation="vertical" >
<Button
android:id="#+id/button4"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/button3"
android:layout_alignBottom="#+id/button3"
android:layout_alignParentRight="true"
android:layout_marginRight="28dp"
android:text="3" />
<Button
android:id="#+id/button3"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/button2"
android:layout_alignBottom="#+id/button2"
android:layout_toLeftOf="#+id/button4"
android:text="4" />
<Button
android:id="#+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_marginBottom="124dp"
android:layout_marginLeft="42dp"
android:text="1" />
<Button
android:id="#+id/button2"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/button1"
android:layout_alignBottom="#+id/button1"
android:layout_marginLeft="15dp"
android:layout_toRightOf="#+id/button1"
android:text="2" />
</RelativeLayout>

Try this..
<?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" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:gravity="center" >
<Button
android:id="#+id/btn_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1" />
<Button
android:id="#+id/btn_2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/btn_1"
android:text="2" />
<Button
android:id="#+id/btn_3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/btn_2"
android:text="3" />
<Button
android:id="#+id/btn_4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/btn_3"
android:text="4" />
</RelativeLayout>
</RelativeLayout>
From my ans i am getting screen like this.
For OP's question my ans is correct. can any one tell me what's wrong in my ans. the downvoter need to tell why do you downvote

buttons aligment in virtual device

I am trying to align buttons like simple calculator
But when i align buttons like that when i run it buttons can shift from desired location.
I can't understand what is problem.
here is code :
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="#dimen/activity_horizontal_margin"
android:gravity="fill_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=".MainActivity" >
<Button
android:id="#+id/button11"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/button4"
android:layout_alignBottom="#+id/button4"
android:layout_alignLeft="#+id/button14"
android:layout_toLeftOf="#+id/button12"
android:onClick="#string/_onclick"
android:text="#string/_4" />
<Button
android:id="#+id/button16"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/button4"
android:layout_toLeftOf="#+id/button5"
android:onClick="#string/_onclick"
android:text="#string/_9" />
<Button
android:id="#+id/button7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button6"
android:layout_alignParentBottom="true"
android:layout_marginBottom="16dp"
android:onClick="#string/_onclick"
android:text="#string/_" />
<Button
android:id="#+id/button8"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="#id/button7"
android:layout_alignLeft="#+id/button11"
android:layout_toLeftOf="#+id/button9"
android:onClick="#string/_onclick"
android:text="#string/_1" />
<Button
android:id="#+id/button10"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/button7"
android:layout_toRightOf="#+id/button1"
android:onClick="#string/_onclick"
android:text="#string/_3" />
<Button
android:id="#+id/button6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/button7"
android:layout_alignLeft="#+id/button4"
android:onClick="#string/_onclick"
android:text="#string/_jam" />
<Button
android:id="#+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/button12"
android:layout_alignBottom="#+id/button12"
android:layout_alignLeft="#+id/button5"
android:onClick="#string/_onclick"
android:text="#string/_menha" />
<Button
android:id="#+id/button5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/button16"
android:layout_alignBottom="#+id/button16"
android:layout_alignLeft="#+id/button3"
android:onClick="#string/_onclick"
android:text="#string/_zarb" />
<Button
android:id="#+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/button5"
android:layout_alignParentRight="true"
android:layout_marginRight="15dp"
android:onClick="#string/_onclick"
android:text="#string/_taghsim" />
<Button
android:id="#+id/button14"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="#+id/button11"
android:layout_toLeftOf="#+id/button12"
android:onClick="#string/_onclick"
android:text="#string/_7" />
<Button
android:id="#+id/button15"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="#+id/button13"
android:layout_alignLeft="#+id/button12"
android:layout_toLeftOf="#+id/button13"
android:onClick="#string/_onclick"
android:text="#string/_8" />
<Button
android:id="#+id/button9"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/button7"
android:layout_alignLeft="#id/button12"
android:layout_alignTop="#id/button10"
android:layout_toLeftOf="#+id/button10"
android:onClick="#string/_onclick"
android:text="#string/_2" />
<Button
android:id="#+id/button2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/button3"
android:layout_alignBottom="#+id/button3"
android:layout_toLeftOf="#+id/button3"
android:layout_toRightOf="#+id/button1"
android:onClick="#string/_onclick"
android:text="#string/c" />
<Button
android:id="#+id/button1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="#+id/button14"
android:layout_alignLeft="#+id/button14"
android:layout_alignParentBottom="false"
android:layout_alignParentRight="false"
android:layout_alignRight="#+id/button15"
android:layout_alignWithParentIfMissing="false"
android:layout_centerInParent="false"
android:onClick="#string/_onclick"
android:text="#string/ce" />
<Button
android:id="#+id/button17"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/button7"
android:layout_alignBottom="#+id/button7"
android:layout_alignRight="#+id/button10"
android:layout_toRightOf="#+id/button9"
android:onClick="#string/_onclick"
android:text="#string/_dot" />
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button1"
android:layout_alignParentTop="true"
android:layout_marginLeft="17dp"
android:layout_marginTop="59dp"
android:textSize="20sp"
tools:ignore="SpUsage" />
<Button
android:id="#+id/button13"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#id/button10"
android:layout_alignBaseline="#+id/button12"
android:layout_alignBottom="#+id/button12"
android:layout_alignLeft="#+id/button16"
android:layout_below="#id/button16"
android:layout_toLeftOf="#id/button4"
android:onClick="#string/_onclick"
android:text="#string/_6" />
<Button
android:id="#+id/Button01"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="#+id/button8"
android:layout_toLeftOf="#+id/button17"
android:onClick="#string/_onclick"
android:text="#string/_0" />
<Button
android:id="#+id/button12"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/button10"
android:layout_toLeftOf="#+id/button13"
android:onClick="#string/_onclick"
android:text="#string/_5" />
this is screenshot of my problems:
http://i39.tinypic.com/xm04lz.jpg
http://i42.tinypic.com/ibgmk3.jpg
please help me how can i solve the problem

Why are you making your life so difficult? Stop this alignment madness and use LinearLayouts. Create a LinearLayout and put the 5 rows of buttons inside, with each row as LinearLayout. Then use the layout_weight parameter to add them the same (or desired) width.
Example:
<LinearLayout>
<LinearLayout>
Button Button Button Button
</LinearLayout>
<LinearLayout>
Button Button Button Button
</LinearLayout>
....
</LinearLayout>

How to align the buttons on correct position in android

I want to align the buttons as shown bellow,
for this, I used relative layout. But The buttons are not fit to correct position due to the buttons relations with others. I don't know other possible methods for this.. Please Help me if there another suitable methods for this arrangement of buttons..

You can design as much as u want
First of all make one
Large size Relative layout
add four buttons to that layout at each cornet of layout.
then add button to exact middle of two corner buttons
try this
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<RelativeLayout
android:layout_width="300dp"
android:layout_height="300dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:background="#00F" >
<RelativeLayout
android:id="#+id/relativeLayout1"
android:layout_width="180dp"
android:layout_height="180dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:background="#FFF" >
<Button
android:id="#+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="Button" />
<Button
android:id="#+id/button2"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:text="Button" />
<Button
android:id="#+id/button3"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text="Button" />
<Button
android:id="#+id/button4"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:text="Button" />
<Button
android:id="#+id/button5"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:text="Button" />
<Button
android:id="#+id/button6"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:text="Button" />
<Button
android:id="#+id/button7"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:text="Button" />
<Button
android:id="#+id/button8"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignTop="#+id/button7"
android:text="Button" />
</RelativeLayout>
<Button
android:id="#+id/button9"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="Button" />
<Button
android:id="#+id/button10"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text="Button" />
<Button
android:id="#+id/button11"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:text="Button" />
<Button
android:id="#+id/button12"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:text="Button" />
<Button
android:id="#+id/button13"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:text="Button" />
<Button
android:id="#+id/button14"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:text="Button" />
<Button
android:id="#+id/button15"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/button14"
android:layout_alignParentRight="true"
android:text="Button" />
<Button
android:id="#+id/button16"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:text="Button" />
</RelativeLayout>
</RelativeLayout>

I worked on your solution and made a similar looking layout. But I couldn't get exactly what you are looking for, bcoz your Image sample is some what in a square manner whereas the device screen is in rectangular shape.
Anyway try this out,
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<RelativeLayout android:id="#+id/first_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" 1"/>
<Button android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" 2"
android:layout_alignParentRight="true"/>
<Button android:id="#+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:text=" 3"/>
<Button android:id="#+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:text=" 4"/>
<Button android:id="#+id/button5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:text=" 5"/>
<Button android:id="#+id/button6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_alignParentRight="true"
android:text=" 6"/>
<Button android:id="#+id/button7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:text=" 7"/>
<Button android:id="#+id/button8"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_alignParentBottom="true"
android:text=" 8"/>
<RelativeLayout android:id="#+id/first_layout"
android:paddingTop="50dip"
android:paddingBottom="50dip"
android:paddingLeft="40dip"
android:paddingRight="40dip"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" 1"/>
<Button android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" 2"
android:layout_alignParentRight="true"/>
<Button android:id="#+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:text=" 3"/>
<Button android:id="#+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:text=" 4"/>
<Button android:id="#+id/button5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:text=" 5"/>
<Button android:id="#+id/button6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_alignParentRight="true"
android:text=" 6"/>
<Button android:id="#+id/button7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:text=" 7"/>
<Button android:id="#+id/button8"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_alignParentBottom="true"
android:text=" 8"/>
<RelativeLayout android:id="#+id/first_layout"
android:paddingTop="50dip"
android:paddingBottom="50dip"
android:paddingLeft="40dip"
android:paddingRight="40dip"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" 1"/>
<Button android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" 2"
android:layout_alignParentRight="true"/>
<Button android:id="#+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:text=" 3"/>
<Button android:id="#+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:text=" 4"/>
<Button android:id="#+id/button5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:text=" 5"/>
<Button android:id="#+id/button6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_alignParentRight="true"
android:text=" 6"/>
<Button android:id="#+id/button7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:text=" 7"/>
<Button android:id="#+id/button8"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_alignParentBottom="true"
android:text=" 8"/>
</RelativeLayout>
</RelativeLayout>
</RelativeLayout>
Screenshot,

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

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at first you don't have close tag for RelativeLayout. and if you want scrollview work then you have to insert enough views in scrollview for fill screen height

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