Develop Reference

Bottom Navigation View goes up with windowSoftInputMode=adjustResize

I need windowSoftInputMode= adjustRezise for my layout so that my buttons go up with the keyboard. BUT I don't want my BottomNagivationView to be affected by this.
How can I solve such?
My BottomNavigationView comes from MainActivity.xml which is:
<RelativeLayout
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"
tools:context=".MainActivity">
<FrameLayout
android:id="#+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/bottom_navigation"></FrameLayout>
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/bottom_navigation"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_alignParentBottom="true"
app:menu="#menu/bottom_menu"/>
</RelativeLayout>
My manifest has android:windowSoftInputMode="adjustPan" but I adjust it by code when I open the fragment with:
getActivity().getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
Here are some pictures so you could understand what I mean: https://imgur.com/a/vjePxI6
So what I would like to know is how I could set the BottomNavigationView to do nothing on keyboard opening while I'd like my buttons to be affected by :
getActivity().getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);

In my case problem solved by just adding following line in manifest file.
android:windowSoftInputMode="adjustResize|adjustPan"

add android:windowSoftInputMode="adjustPan" inside your activity tag into your manifest file.
then go to your activity and change the parent layout to RelativeLayout, then create your FrameLayout which holds your fragments inside your relative layout which is your parent layout. Then add your second layout which is LinearLayout that holds the bottomNavigationView and make its Height and width match_parent but below the FrameLayout.
Below is the example of the main activity layout
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
android:orientation="vertical"
tools:context=".MainActivity">
//FrameLayout which holds all your fragments
<FrameLayout
android:id="#+id/fragments_container"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</FrameLayout>
//BottomNavigationView Container
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:gravity="bottom"
android:layout_below="#id/fragments_container">
//BottomMenus
<com.google.android.material.bottomnavigation.BottomNavigationView
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:id="#+id/bottom_navigation"
android:background="#drawable/rectangle_4_dash"
android:layout_alignParentBottom="true">
//Container of Menus
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:weightSum="5">
//BottomMenu One
<LinearLayout
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="match_parent"
android:orientation="vertical"
android:gravity="center_vertical">
<ImageView
android:layout_width="20dp"
android:layout_height="20dp"
android:layout_gravity="center"
android:src="#drawable/home_icon" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Home" />
</LinearLayout>
//BottomMenu Two
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center_vertical"
android:orientation="vertical">
<ImageView
android:layout_width="20dp"
android:layout_height="20dp"
android:layout_gravity="center"
android:src="#drawable/contact_icon" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Contact" />
</LinearLayout>
//BottomMenu Three
<LinearLayout
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="match_parent"
android:orientation="vertical"
android:gravity="center_vertical">
<ImageView
android:layout_width="20dp"
android:layout_height="20dp"
android:layout_gravity="center"
android:src="#drawable/about_icon" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="About"
android:layout_gravity="center"/>
</LinearLayout>
//BottomMenu Four
<LinearLayout
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="match_parent"
android:orientation="vertical"
android:gravity="center_vertical">
<ImageView
android:layout_width="20dp"
android:layout_height="17dp"
android:layout_gravity="center"
android:src="#drawable/services_icon" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Services"
android:layout_gravity="center"/>
</LinearLayout>
</LinearLayout>
</com.google.android.material.bottomnavigation.BottomNavigationView>
</LinearLayout>
Then go to your fragment which you want to scroll and design it like below one.
<?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">
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:text="Title Of Your Form"
android:textAlignment="center"
android:textColor="#color/black"
android:textSize="18sp"
android:textStyle="bold" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="20dp">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="#string/f_name"
android:inputType="textPersonName"
android:padding="10dp"
android:textSize="14sp" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:hint="#string/m_name"
android:inputType="textPersonName"
android:padding="10dp"
android:textSize="14sp" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:hint="#string/l_name"
android:inputType="textPersonName"
android:padding="10dp"
android:textSize="14sp" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:hint="Message"
android:inputType="text"
android:padding="10dp"
android:textSize="14sp" />
</LinearLayout>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="10dp"
android:text="Send Messagge"
android:textAllCaps="false"
android:textColor="#color/white"
android:layout_marginBottom="40dp"/>
</LinearLayout>
</ScrollView>
That is how i solved it,
if you have any doubt please let me know but if its helps or looks like a correct answer please mark it as a correct answer thanks.

Center button in a LinearLayout

I just want to center "CenterButton" (center of the root LinearLayout) but Androids just not cooperating..
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="200dp"
android:layout_gravity="center_horizontal"
android:layout_weight="0.00"
android:padding="5dp"
android:background="#zegerg"
android:id="#+id/LinearLayout1">
<ImageView
android:id="#+id/ImageView1"
android:layout_height="match_parent"
android:layout_width="151dp"
android:src="#mipmap/image_1"
android:contentDescription="#string/abcdef"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button"
android:id="#+id/CenterButton"
android:layout_gravity="center_horizontal|center_vertical|center"/>
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="20dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Text !"
android:id="#+id/TextView"
android:paddingBottom="30dp"
android:textColor="#37a52c" />
<ProgressBar
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/ProgressBar"
android:paddingBottom="30dp"
android:progressTint="#37a52c" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/text_text"
android:id="#+id/Button2"
android:layout_gravity="center_horizontal" />
</LinearLayout>
</LinearLayout>
Tried putting it at the end of the XML but doesn't work because the other elements push it aside.. not really sure what's happening.

if you want to have all three first level children to be in equally-sized columns, then you need to add to all of them the followings attribute:
android:layout_width="0dp"
android:layout_weight="1"
(don't forget the dimension "dp" to the width parameter, otherwise the IDE will complain).
...
<ImageView
android:id="#+id/ImageView1"
android:layout_height="match_parent"
android:layout_width="0dp"
android:layout_weight="1"
android:src="#mipmap/image_1"
android:contentDescription="#string/abcdef"/>
<Button
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:text="Button"
android:id="#+id/CenterButton"
android:layout_gravity="center_horizontal|center_vertical|center"/>
<LinearLayout
android:orientation="vertical"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="match_parent"
android:padding="20dp">
....
EDITED:
If you want your CenterButton to overlap all the other views, then what you have to do is:
wrap everything in a relative layout with height equal to 200dp, as its first child
remove the button CenterButton from the current position and add it at the bottom of everything, still inside the relative layout, but below the linear layout
add those properties to the button to make it center in the parent
android:layout_centerInParent="true"
So finally you will have something like this (I have changed some resources):
<?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="200dp">
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="200dp"
android:layout_gravity="center_horizontal"
android:layout_weight="0.00"
android:padding="5dp"
android:background="#android:color/holo_orange_dark"
android:id="#+id/LinearLayout1">
<ImageView
android:id="#+id/ImageView1"
android:layout_height="match_parent"
android:layout_width="0dp"
android:layout_weight="1"
android:src="#drawable/plus"
android:contentDescription="abcdef"/>
<LinearLayout
android:orientation="vertical"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="match_parent"
android:padding="20dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Text !"
android:id="#+id/TextView"
android:paddingBottom="30dp"
android:textColor="#37a52c" />
<ProgressBar
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/ProgressBar"
android:paddingBottom="30dp"
android:progressTint="#37a52c" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="text"
android:id="#+id/Button2"
android:layout_gravity="center_horizontal" />
</LinearLayout>
</LinearLayout>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="Button"
android:id="#+id/CenterButton"
android:layout_gravity="center_horizontal|center_vertical|center"/>
</RelativeLayout>

You can use weight for such purposes for child items. Make layout_width for all of them as 0dp and set layout_weight as 1.

Give the three children in the topmost linear layout a gravity of 1 and a width of 0.

It's not clear what exactly is your problem. However, here are some general notes :
To center a View or a Layout inside RelativeView use layout_centerInParent="true"
To make a Layout on top of other layouts use FrameLayout
The order of the views/layouts in your xml file is important. The one you write the last will be on the top (in our example : the FrameLayout or just the CenterButton should be written after the other views and layouts in your xml file)
To distribute the available space inside LinearLayout among its views use android:layout_weight="1" (change the value according to your needs)
you can play aground with this example :
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="200dp">
<LinearLayout
android:id="#+id/LinearLayout1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:background="#fff"
android:orientation="horizontal"
android:padding="5dp">
<ImageView
android:id="#+id/ImageView1"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="3"
android:src="#mipmap/ic_launcher" />
<View
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1" />
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="3"
android:orientation="vertical">
<TextView
android:id="#+id/TextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingBottom="30dp"
android:text="Text !"
android:textColor="#37a52c" />
<ProgressBar
android:id="#+id/ProgressBar"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingBottom="30dp"
android:progressTint="#37a52c" />
<Button
android:id="#+id/Button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="text_text" />
</LinearLayout>
</LinearLayout>
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true">
<Button
android:id="#+id/CenterButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|center_vertical|center"
android:text="Button" />
</FrameLayout>
</RelativeLayout>

Webview + admob in bottom + LinearLayout

I'm unable to publish correctly admob in the botton with a webview in LinearLayout with a Progressbar in the top. I tried many ways, with Relatives, and search in Stackoverflow and follow some steps, but this Progressbar won't work.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical" >
<ProgressBar
android:id="#+id/ProgressBar"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:indeterminate="false"
android:maxHeight="10dip"
android:minHeight="10dip"
android:progress="50"
android:progressDrawable="#drawable/greenprogress" />
<WebView
android:id="#+id/webview"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
</LinearLayout>
<com.google.ads.AdView
android:id="#+id/adView"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
ads:adSize="BANNER"
ads:adUnitId="ca-app-pub-7041222655570180/1503313077"
ads:loadAdOnCreate="true"
ads:refreshInterval="30" >
</com.google.ads.AdView>
</LinearLayout>

Your posted layout won't work because your inner linear layout has a height of wrap_content (thereby causing its children's layout_weights to be ignored) but the web view has a height of 0. You also gave your ad view a weight of 1, as if it should grab as much space as possible, when normally an ad should have a fixed height.
I'm not sure why RelativeLayout didn't work for you, but maybe you were trying to use it with layout_weight? If so, note that layout_weight only applies to the children of a LinearLayout.
Here is how I would do it:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<com.google.ads.AdView
android:id="#+id/adView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentTop="false"
android:layout_centerHorizontal="true"
ads:adSize="BANNER"
ads:adUnitId="ca-app-pub-7041222655570180/1503313077"
ads:loadAdOnCreate="true"
ads:refreshInterval="30" >
</com.google.ads.AdView>
<LinearLayout
android:layout_alignParentTop="true"
android:layout_above="#id/adView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ProgressBar
android:id="#+id/ProgressBar"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:indeterminate="false"
android:progress="50"
android:progressDrawable="#drawable/greenprogress" />
<WebView
android:id="#+id/webview"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
</LinearLayout>
</RelativeLayout>

Align pictures top center, bottom right and bottom left

I'm trying to align 3 pictures in a LinearLayout so that one is centered at the top, another is at the bottom aligned to the left side and the last is at the bottom aligned to the right side. Pretty much like a pyramid. How could I do this? Can you provide an example?
i.e
X
X X

Use this one:
<?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_gravity="center"
android:gravity="center" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:src="#drawable/ic_launcher" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="bottom"
android:orientation="horizontal" >
<ImageView
android:id="#+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_launcher" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="right" >
<ImageView
android:id="#+id/imageView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_launcher" />
</LinearLayout>
</LinearLayout>
</LinearLayout>

It will be more flexible if you do it in RelativeLayout but if you want to do it in LinearLayout here is the solution:
<?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" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="top|center_horizontal"
android:src="#drawable/ic_launcher" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="bottom"
android:orientation="horizontal" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_launcher" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="right" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_launcher" />
</LinearLayout>
</LinearLayout>
</LinearLayout>

You need a RelativeLayout, not a LinearLayout.
Image A must specify the attribute
android:layout_alignParentTop="true".
Image B must specify the attributes
android:layout_alignParentBottom="true"
and
android:layout_alignParentLeft="true".
Image C must specify the attributes
android:layout_alignParentBottom="true"
and
android:layout_alignParentRight="true"

Android button width half of available width - Layouts

I have made a layout with imageview and some buttons i want the buttons to have half the available screen width and height.
This is what I have tried, my xml is as follows.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<LinearLayout
android:id="#+id/imageidid"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:orientation="vertical" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="fill_parent"
android:layout_height="200dp"
android:scaleType="centerCrop"
android:src="#drawable/actionbar_bg" />
</LinearLayout>
<LinearLayout
android:id="#+id/1st row"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_below="#id/imageid"
>
<Button
android:id="#+id/btn1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="row1 col1" />
<Button
android:id="#+id/btn2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="row1 col2" />
</LinearLayout>
<LinearLayout
android:id="#+id/2nd row"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_below="#id/1st row"
>
<Button
android:id="#+id/btn1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="row2 col1" />
<Button
android:id="#+id/btn2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="row2 col2" />
</LinearLayout>
</RelativeLayout>
and the output looks like this.
and I want something like this.(note imageview to take 40% of screen height)

here is the code you need to achive what you want, you can just change the wight of the views to set the percentage of screen you want the view to take:
<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/imageView1"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="40"
android:scaleType="centerCrop"
android:src="#drawable/actionbar_bg" />
<LinearLayout
android:id="#+id/1st row"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_below="#id/imageid"
android:layout_weight="30"
android:orientation="horizontal" >
<Button
android:id="#+id/btn1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:text="row1 col1" />
<Button
android:id="#+id/btn2"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:text="row1 col2" />
</LinearLayout>
<LinearLayout
android:id="#+id/2nd row"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_below="#id/1st row"
android:layout_weight="30"
android:orientation="horizontal" >
<Button
android:id="#+id/btn1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:text="row2 col1" />
<Button
android:id="#+id/btn2"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:text="row2 col2" />
</LinearLayout>
</LinearLayout>

Try this, notes:
according to the "hint" nested weights are bad for performance, nevertheless look at the code,
Fill_parent is deprecated, use match_parent
Your "image" is not representative of the percentages visually, in any case, it is easy to change,
Code:
<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:id="#+id/imageid"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="4"
android:orientation="vertical" >
<ImageView
android:id="#+id/imageView1"
android:contentDescription="#string/description"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"
android:src="#drawable/actionbar_bg" />
</LinearLayout>
<LinearLayout
android:id="#+id/1strow"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="3"
android:orientation="horizontal" >
<Button
android:id="#+id/btn11"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="#string/row1col1" />
<Button
android:id="#+id/btn21"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="#string/row1col2" />
</LinearLayout>
<LinearLayout
android:id="#+id/2ndrow"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="3"
android:orientation="horizontal" >
<Button
android:id="#+id/btn12"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="#string/row2col1" />
<Button
android:id="#+id/btn22"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="#string/row2col2" />
</LinearLayout>
</LinearLayout>

Your RelativeLayout isn't doing anything special, so change it to a LinearLayout (leave both width and height attributes as "match_parent" but add
android:orientation="vertical"
Then for each of your smaller LinearLayouts, add:
android:layout_weight=".xx"
where xx is the percentage of the large LinearLayout that you want your child layouts to use.
Background reference here, please do make sure to read it:
http://developer.android.com/guide/topics/ui/layout/linear.html

You can use LinearLayout as a main layout and then use weightsum property of linear layout