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android LinearLayout's size not fixed when using 'wieght' property

I am trying to make android screen with three LinearLayouts. The parent LinearLayout's weightsum is 10 and I give child LinearLayout's weight as ( 1.5 , 7.5 , 1 )
I thought LinearLayout's size would be fixed, but When I try to put some view elements in the child LinearLayouts, the child LinearLayout's size changes depending on the element inside.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:background="#color/light_black"
android:weightSum="10"
tools:context=".userRegisterActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1.5"
android:weightSum="10"
android:orientation="vertical">
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="7.5"
android:orientation="vertical">
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical">
</LinearLayout>
</LinearLayout>
if I put TextView elements in the child LinearLayout, the sizes are changing... How to make it fix?

I got the answer.
the android:layout_height property must be '0dp' not match_parent

Adding two linear layout in scrollview the layout either shrink or compress. Here i am using layout_weight in them that's why the problem occurs

when i used the single linear layout in scrollview then the output and code is like that
Xml code:
<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:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="10">
<ImageView
android:id="#+id/disp_img"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="4"
android:background="#color/grey"
android:scaleType="fitXY" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_margin="10dp"
android:layout_weight="5"
android:orientation="vertical">
<TextView
android:id="#+id/disp_title"
style="#style/disTitleTextViewStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"></TextView>
<TextView
android:id="#+id/disp_cont"
style="#style/disdiscTextViewStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"></TextView>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:background="#drawable/disptextdes"
android:orientation="vertical"
>
<TextView
android:id="#+id/disp_readmore"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="30dp"
android:layout_marginTop="15dp"
android:text="To read more click on this"
android:textColor="#android:color/black"
android:textSize="15sp"></TextView>
</LinearLayout>
</LinearLayout>
</ScrollView>
</RelativeLayout>
output is:
But when i add another layout then code and output is look like
<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:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true">
//first linear layout
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="10">
<ImageView
android:id="#+id/disp_img"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="4"
android:background="#color/grey"
android:scaleType="fitXY" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_margin="10dp"
android:layout_weight="5"
android:orientation="vertical">
<TextView
android:id="#+id/disp_title"
style="#style/disTitleTextViewStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"></TextView>
<TextView
android:id="#+id/disp_cont"
style="#style/disdiscTextViewStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"></TextView>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:background="#drawable/disptextdes"
android:orientation="vertical"
>
<TextView
android:id="#+id/disp_readmore"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="30dp"
android:layout_marginTop="15dp"
android:text="To read more click on this"
android:textColor="#android:color/black"
android:textSize="15sp"></TextView>
</LinearLayout>
// when i add second linear layout then the first linear layout is varied,I don't know why
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/citispotterlogo"></ImageView>
</LinearLayout>
</LinearLayout>
</ScrollView>
</RelativeLayout>
output is :
When i added the image in linear layout the first linear layout shrink I don't know why?
Please help me to solve this,I try to search this on google in stackoverflow but i don't find nothing about this. Can anybody solve this or give me some another approach for solving this problem.
So my final output is look like this
I have added two images which are in scrollview
(https://i.stack.imgur.com/DpJ9C.png)
(https://i.stack.imgur.com/QhQoL.png)

<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="10">
This LinearLayout has height which is match_parent, you should have used wrap_content or use a fixed height so that the second layout must be visible

This layout uses a weightSum in the first linear layout when you add the last LinearLayout you do not include a weight for it. This is causing the UI to render incorrectly.
I've included a couple of option solution for you both should do the job.
Option 1
change the weighted sum in the first LinearLayout to 11 and then add a weight value of 1 to the last LinearLayout.
Option 2
Add a weighted value to the last LinearLayout but you will need to adjust the rest of the weighted values so it equals weight sum in the first LinearLayout (10).
LayoutWeight Review
LinearLayout supports assigning a weight to individual children with the android:layout_weight attribute. This attribute assigns an "importance" value to a view in terms of how much space it should occupy on the screen. A larger weight value allows it to expand to fill any remaining space in the parent view. Child views can specify a weight value, and then any remaining space in the view group is assigned to children in the proportion of their declared weight. The default weight is zero.

I don't understand how this is working (MATCH_PARENT at View with layout_weight)

When I set MATCH_PARENT for View + layout_weight the elements of the view behave strangely. Please can you explain why this is so. For example, here is the code on which to experiment. I can't understand the pattern. The less put the weight of the item, so it is more, however, it is unclear how many times.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:weightSum="5"
tools:context=".MainActivity">
<LinearLayout
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FF0"
android:orientation="horizontal">
</LinearLayout>
<LinearLayout
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#F00"
android:orientation="horizontal">
</LinearLayout>
<LinearLayout
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#F0F"
android:orientation="horizontal">
</LinearLayout>
<LinearLayout
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#0FF"
android:orientation="horizontal">
</LinearLayout>
<LinearLayout
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#00F"
android:orientation="horizontal">
</LinearLayout>
</LinearLayout>
Testing for Yellow layout: set layout_weight= 0.5 > large?? how much bigger? Did the elements shrink in size or were they thrown out of the parent?
<LinearLayout
android:layout_weight="0.5"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#F00"
android:orientation="horizontal">
</LinearLayout>
Update, PS: I know how the layout will work with WRAP_CONTENT (or 0dp). If you set MATCH_PARENT + layout_weight, then we have a fixed element size regardless of the content, when WRAP_CONTENT does not guarantee a fixed size from the content (and if the content size is increased, the element will be stretched). I am only interested in the pattern MATCH_PARENT + layout_weight, because it guarantees the block size when the content size is exceeded.

The less put the weight of the item, so it is more...
The reason is because you are assigning android:layout_width as match_parent to all LinearLayout. To get android:layout_weight worked, you should set android:layout_width as 0.

First of all, give android:weightSum to the parent of the layouts.
Secondly, if you have layouts placed horizontally next to each other then set android:layout_width="0dp" for each element.
Similarly, for vertically aligned elements, give android:layout_height="0dp".

ScrollView filling screen when child textview is too large

I have a LinearLayout with 3 children with weights to set their proportions: 1/7, 3/7, 3/7. The last section contains text that could extend outside the space allowed, so I added a scrollview.
<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="0dp"
android:layout_weight="1"/>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="3"
android:orientation="vertical"
android:background="#drawable/package_status_border"/>
<ScrollView
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="3">
<TextView
android:id="#+id/PackageContent"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</ScrollView>
</LinearLayout>
This layout is working fine if the PackageContent text is small:
expected formatting
But, if the PackageContent text is large, rather than maintaining the expected height and just scrolling the extra text it is filling the entire screen:
bad formatting, with scroll view filling entire screen
How to I make sure that the last section is still only 3/7 of the screen, with content scrolling, regardless of how much content the textView contains?
I have also tried putting the ScrollView within its own LinearLayout but that did not work either.

<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="0dp"
android:layout_weight="1"/>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="3"
android:orientation="vertical"
android:background="#drawable/package_status_border"/>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="3">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/PackageContent"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</ScrollView>
</FrameLayout>
</LinearLayout>

Android: How to separate screen into two fixed areas, in either orientation, and rotate content only within each area

I would like to create an app that divides the screen into two squarish halves; in either orientation. The content within each half should rotate; but the two areas should remain fixed.
Could you tell me how to achieve this layout? I would like to place an embedded browser in one half, and a QR code scanner in the other.
I imagine this is a noobish question; I've done very little android development.

you can use layout weight sum and layout weight for this purpose.
use to following line of code:
<LinearLayout
android:id="#+id/head"
android:layout_width="match_parent"
android:layout_height="60dp"
android:orientation="horizontal"
android:weightSum="2"
android:baselineAligned="false"
android:layout_gravity="center_horizontal">
<LinearLayout
android:layout_width="50dp"
android:layout_height="match_parent"
android:layout_weight="1">
<LinearLayout
android:layout_width="50dp"
android:layout_height="match_parent"
android:layout_weight="1">
</LinearLayout>

set layout_weight to 1 in both LinearLayout will divide the screen equally.
<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"
tools:context=".Main"
android:baselineAligned="false"
android:orientation="horizontal">
<LinearLayout
android:layout_weight="1"
android:background="#9561A7"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!--views of the first section-->
/>
</LinearLayout>
<LinearLayout
android:layout_weight="1"
android:background="#006C91"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!--views of the second section-->
/>
</LinearLayout>
good luck .