place and align a button above 4 views

place and align a button above 4 views - android

I want to place a button above 4 other views:
The views b1-b4 are not really buttons, but they look and behave like buttons (clickable and focusable). Equal spacing is desirable.
I have found Evenly spaced out row of buttons required but how do I make button0 occupy exactly the width of b1-b4?

Try this.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="20dp"
android:orientation="vertical" >
<Button
android:id="#+id/button1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button0" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<Button
android:id="#+id/button2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="b1" />
<Button
android:id="#+id/button3"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="b2" />
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="b3" />
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="b4" />
</LinearLayout>
</LinearLayout>
Now let me know, is it helpful or not..??

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"
tools:context=".MainActivity" >
<LinearLayout
android:id="#+id/linear"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true" >
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="B1" />
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="B2" />
<Button
android:id="#+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="B3" />
<Button
android:id="#+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="B4" />
</LinearLayout>
<Button
android:id="#+id/button0"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/linear"
android:layout_alignLeft="#+id/linear"
android:layout_alignRight="#+id/linear"
android:text="Button0" />
</RelativeLayout>

Related

Align Multiple Views at the bottom of screen

I'm new to Android and I want to create an activity with 3 set (line) of Buttons at the bottom of screen .For my example I wrote this code for 2 set (line) of 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">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:layout_alignParentBottom="true">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="1" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="2" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="3" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="4" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="5" />
</LinearLayout>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:layout_alignParentBottom="true">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="6" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="7" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="8" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="9" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="10" />
</LinearLayout>
</RelativeLayout>
I want to buttons 6-10 put on (above) the buttons 1-5 (like Stack).
How I can do this?
Thanks

You are using a RelativeLayout with two LinearLayouts.
You should give both your LinearLayout ids and after that you will position the other LinearLayout which you want to be on top by giving it the atrribute
android:layout_above="#id/the_id_of_the_one_you_want_to_be_below"

Try to wrap your two LinearLayout in a parent linearLayout.
That parent layout need to be aligned to the bottom.
Something like 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">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:layout_alignParentBottom="true"
android:orientation="vertical">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="1" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="2" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="3" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="4" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="5" />
</LinearLayout>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="6" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="7" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="8" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="9" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="10" />
</LinearLayout>
</LinearLayout>
</RelativeLayout>

How Can I edit my buttons

I tried to use a LinearLayout with 4 buttons but the last one was cut. How can I edit my code to get button's width corresponding to all smartphones'resolutions
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.2"
android:gravity="center_horizontal"
android:orientation="horizontal">
<Button
android:id="#+id/red"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="RED" />
<Button
android:id="#+id/blue"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="BLUE" />
<Button
android:id="#+id/yellow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="YELLOW" />
<Button
android:id="#+id/green"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="GREEN" />
</LinearLayout>
Thanks

make width="0dp" in all buttons and add
android:layout_weight="1"
to all buttons

First,set android:weightSum="4" in the LinearLayout.
And set android:layout_width="Odp" and android:layout_weight="1" in your Button .
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:weightSum="4"
android:gravity="center_horizontal"
android:orientation="horizontal">
<Button
android:id="#+id/red"
android:layout_width="Odp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="RED" />
<Button
android:id="#+id/blue"
android:layout_width="Odp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="BLUE" />
<Button
android:id="#+id/yellow"
android:layout_width="Odp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="YELLOW" />
<Button
android:id="#+id/green"
android:layout_width="Odp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="GREEN" />
</LinearLayout>
</LinearLayout>

Use weightSum to get this equally divided layout by adjusting layout_weight
Try this once:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:weightSum="4"
android:gravity="center_horizontal"
android:orientation="horizontal">
<Button
android:id="#+id/red"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="RED" />
<Button
android:id="#+id/blue"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="BLUE" />
<Button
android:id="#+id/yellow"
android:layout_width=match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="YELLOW" />
<Button
android:id="#+id/green"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="GREEN" />
</LinearLayout>
</LinearLayout>

LinearLayout (vertical) putt 2 Buttons side by side and more buttons below

I have some little problems at creating some buttons. I want to Place 2 Buttons side by side (worked) and more (exp. 3 Buttons) below in a LinearLayout. Actually everything is working for me but if I put another Button the button is below but above there is free space.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center" >
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true">
<LinearLayout
android:orientation="horizontal"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:gravity="center">
<Button
android:id="#+id/button1"
android:text="Button1"
android:textColor="#FFFFFF"
android:textSize="30sp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/mybutton"
android:layout_weight="1"
android:layout_marginBottom="200dp" />
<Button
android:id="#+id/button2"
android:text="Button2"
android:textColor="#FFFFFF"
android:textSize="30sp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/mybutton"
android:layout_weight="1"
android:layout_marginLeft="5dp"
android:layout_marginBottom="100dp" />
<Button
android:id="#+id/button3"
android:text="Button3"
android:textColor="#FFFFFF"
android:textSize="30sp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/mybutton"
android:layout_weight="1"
android:layout_marginLeft="5dp"
android:layout_marginBottom="200dp" />
</LinearLayout>
</ScrollView>
</RelativeLayout>
Thats how it looks like atm.

first make the width of each button 0dp.
second make the margin bottom equal in the 3 buttons
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center" >
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true">
<LinearLayout
android:orientation="horizontal"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:gravity="center">
<Button
android:id="#+id/button1"
android:text="Button1"
android:textColor="#FFFFFF"
android:textSize="30sp"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="#drawable/mybutton"
android:layout_weight="1"
android:layout_marginBottom="200dp" />
<Button
android:id="#+id/button2"
android:text="Button2"
android:textColor="#FFFFFF"
android:textSize="30sp"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="#drawable/mybutton"
android:layout_weight="1"
android:layout_marginLeft="5dp"
android:layout_marginBottom="200dp" />
<Button
android:id="#+id/button3"
android:text="Button3"
android:textColor="#FFFFFF"
android:textSize="30sp"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="#drawable/mybutton"
android:layout_weight="1"
android:layout_marginLeft="5dp"
android:layout_marginBottom="200dp" />
</LinearLayout>
</ScrollView>
</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_centerHorizontal="true"
android:id="#+id/layout_one">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="button 1"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="button 2"/>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/layout_one"
android:layout_centerHorizontal="true">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="button 3"
/>
</LinearLayout>
</RelativeLayout>
This is the screenshot of pic:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center" >
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true">
<LinearLayout
android:orientation="horizontal"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:gravity="center">
<Button
android:id="#+id/button1"
android:text="Button1"
android:textColor="#FFFFFF"
android:textSize="30sp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/mybutton"
android:layout_weight="1"
android:layout_marginBottom="200dp" />
<Button
android:id="#+id/button2"
android:text="Button2"
android:textColor="#FFFFFF"
android:textSize="30sp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/mybutton"
android:layout_weight="1"
android:layout_marginLeft="5dp"
android:layout_marginBottom="200dp" />
<Button
android:id="#+id/button3"
android:text="Button3"
android:textColor="#FFFFFF"
android:textSize="30sp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/mybutton"
android:layout_weight="1"
android:layout_marginLeft="5dp"
android:layout_marginBottom="200dp" />
</LinearLayout>
</ScrollView>
</RelativeLayout>
Update your xml with this one, Hope it helps you

here is your code:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center" >
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true">
<LinearLayout
android:orientation="horizontal"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:gravity="center">
<Button
android:id="#+id/button1"
android:text="Button1"
android:textColor="#FFFFFF"
android:textSize="30sp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/mybutton"
android:layout_weight="1"
android:layout_marginBottom="200dp" />
<Button
android:id="#+id/button2"
android:text="Button2"
android:textColor="#FFFFFF"
android:textSize="30sp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/mybutton"
android:layout_weight="1"
android:layout_marginLeft="5dp"
android:layout_marginBottom="200dp" />
<Button
android:id="#+id/button3"
android:text="Button3"
android:textColor="#FFFFFF"
android:textSize="30sp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/mybutton"
android:layout_weight="1"
android:layout_marginLeft="5dp"
android:layout_marginBottom="200dp" />
</LinearLayout>
</ScrollView>
Just make android:layout_marginBottom="200dp" /> in 2nd button.

This is happening because You have gave the centre gravity to LinearLayout.
The solution is only that you just remove that gravity tag and run again
Replace this
<LinearLayout
android:orientation="horizontal"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:gravity="center">
to this
<LinearLayout
android:orientation="horizontal"
android:layout_height="wrap_content"
android:layout_width="match_parent">

If you want to place the 3 buttons below each other, you should set the orientation of your LinearLayout to vertical instead of horizontal. This will display your buttons in a vertical order.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center" >
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true">
<LinearLayout
android:orientation="vertical"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:gravity="center">
<Button
android:id="#+id/button1"
android:text="Button1"
android:textColor="#FFFFFF"
android:textSize="30sp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/mybutton" />
<Button
android:id="#+id/button2"
android:text="Button2"
android:textColor="#FFFFFF"
android:textSize="30sp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/mybutton" />
<Button
android:id="#+id/button3"
android:text="Button3"
android:textColor="#FFFFFF"
android:textSize="30sp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/mybutton" />
</LinearLayout>
</ScrollView>
</RelativeLayout>

layout alignment for different screens

i am trying to align the page for different screens namely 4.5inch(xperia ion) and 4inch(s advance) it works with s advance.. but in xperia ion screen it breaks..
the emulator image of both xperia ion and s advance...
i stretched the buttons to avoid mistakes.. but yet when it comes to services.. the system fails... the big buttons on top and bottom are buffer buttons.. they are meant to simply align the rest..
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#drawable/rail" >
<Button
android:id="#+id/btnBufferTop" <-- buffer top button
android:layout_width="wrap_content"
android:layout_height="130dp"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text="Button" />
<Button
android:id="#+id/btnBufferBottom" <-- buffer bottom button
android:layout_width="wrap_content"
android:layout_height="60dp"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:text="Button" />
<Button
android:id="#+id/button1" <-- home button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="#+id/btnBufferTop"
android:text="Button" />
<Button
android:id="#+id/button2" <-- About us button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="#+id/button1"
android:text="Button" />
<Button
android:id="#+id/button3" <-- services
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/btnBufferBottom"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:text="Button" />
<Button
android:id="#+id/button4" <-- clients
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/button3"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:text="Button" />
<Button
android:id="#+id/button5" <-- contacts
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/button4"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_marginBottom="14dp"
android:text="Button" />
is there any other way to do it???? without buffer buttons

// Try this way,hope this will help you to solve your problem...
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<Button
android:id="#+id/btnBufferTop"
android:layout_width="match_parent"
android:layout_height="130dp"
android:text="Button" />
<Button
android:id="#+id/btnBufferBottom"
android:layout_width="match_parent"
android:layout_height="60dp"
android:text="Button" />
<Button
android:id="#+id/button1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:id="#+id/button2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:id="#+id/button3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:id="#+id/button4"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:id="#+id/button5"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="14dp"
android:text="Button" />
</LinearLayout>

its better to go with linear layout with weights.as weights device each screen in equal parts.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:weightSum= 2
android:orientation="vertical">
<Button
android:id="#+id/btnBufferTop"
android: layout_weight="1"
android:layout_width="match_parent"
android:layout_height="0dp"
android:text="Button" />
<Button
android:id="#+id/btnBufferBottom"
android: layout_weight="1"
android:layout_width="match_parent"
android:layout_height="0dp"
android:text="Button" />
</LinearLayout>

If the space between the buttons are the issue, thenTry android:layout_marginTop=""

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#android:color/white"
android:orientation="vertical"
android:gravity="center">
<Button
android:id="#+id/okbutton"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="SET"
/>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#android:color/white"
android:orientation="vertical"
android:gravity="center">
<Button
android:id="#+id/okbuttodn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:text="SET"
/>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#android:color/white"
android:orientation="vertical"
android:gravity="center">
<Button
android:id="#+id/okbuttdtgyodn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:text="SET"
/>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#android:color/white"
android:orientation="vertical"
android:gravity="center">
<Button
android:id="#+id/okbuttrtodn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:text="SET"
/>
</LinearLayout>
</LinearLayout>

How to Align 3 buttons in a line, android?

I have linear vertical layout in parent.
Then a horizontal linear layout in the bottom including 3 buttons
I want 1st button at the leftmost side of the activity in bottom
2nd button in the center
and 3rd button in the rightmost side
Here is the xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<ImageView
android:id="#+id/viewImageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:contentDescription="#null"
android:src="#drawable/ic_launcher" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom" >
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:id="#+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="right"
android:layout_gravity="fill_vertical"
android:text="Button" />
</LinearLayout>

For those type of alignment(one button in extreme left of parent, another in center and one more in extreme right of parent layout) RelativeLayout will be more handy than the LinearLayout.Because, if you use RelativeLayout as your parent layout for your buttons you can make use of android:layout_alignParentLeft="true" for one button you want to align in extreme left,android:layout_centerInParent="true" to align in center and android:layout_alignParentRight="true" to align a button in right side corner.
Try this..
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<ImageView
android:id="#+id/viewImageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:contentDescription="#null"
android:src="#drawable/ic_launcher" />
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom" >
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:text="Button" />
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="Button" />
<Button
android:id="#+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:text="Button" />
</RelativeLayout>
</LinearLayout>

Set the orientation has horizontal
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
>
<Button
android:id="#+id/button1"
android:layout_weight="1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:id="#+id/button2"
android:layout_weight="1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:id="#+id/button3"
android:layout_weight="1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="right"
android:layout_gravity="fill_vertical"
android:text="Button" />
</LinearLayout>
and use weights for buttons
Snap

yes you can do that by applying layout_weight=1:
<?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" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:layout_alignParentBottom="true">
<Button
android:id="#+id/button1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="left " />
<Button
android:id="#+id/button1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Center" />
<Button
android:id="#+id/button1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Right" />
</LinearLayout>
</RelativeLayout>

you can also do it with constraint layout
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button"
app:layout_constraintEnd_toStartOf="#+id/button2"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="#+id/button3"
app:layout_constraintTop_toTopOf="#+id/button3" />
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="#+id/button"
app:layout_constraintTop_toTopOf="#+id/button" />
<Button
android:id="#+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="102dp"
android:text="Button"
app:layout_constraintEnd_toStartOf="#+id/button"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
ss:-

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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