Develop Reference

How to set the ScaleType on a LinearLayout's background image

I have a linear layout like this:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:gravity="center_horizontal"
android:background="#drawable/bgapp" >
What I need now is the possibility to set the background image ScaleType value in order to fill the screen everytime, this because I'm going to download the image and then I'm going to set it as background but without ScaleType the images will not keep it's aspect ratio based on the screen densities.
What I found is this solution:
<?xml version="1.0" encoding="utf-8"?>
<bitmap
xmlns:android="http://schemas.android.com/apk/res/android"
android:src="#drawable/bgapp"
android:scaleType="centerCrop"
android:gravity="bottom|left" />
But It doesn't work as expected.. Is there a way to set a LinearLayout scaleType property or do I need to change my layout?

View's background is stretched depending on the size of the View.
Image scaling is supported by ImageView, and to use it together with the LinearLayout you need an additional container, that will overlay the 2 children (e.g. a FrameLayout):
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="#drawable/bgapp"
android:scaleType="centerCrop"/>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:gravity="center_horizontal">
...
</LinearLayout>
</FrameLayout>

Putting ImageView on the bottom of the screen

I am trying to put the ImageView on the bottom of the layout with following XML:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
tools:context=".MainActivity" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#EEEEEE"
android:gravity="center"
android:orientation="horizontal" >
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:src="#drawable/photo" />
</LinearLayout>
</LinearLayout>
I am following the instructions found here http://sandipchitale.blogspot.co.uk/2010/05/linearlayout-gravity-and-layoutgravity.html
Only difference is that I use ImageView instead of Button as here:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:orientation="horizontal" >
<Button
android:id="#+id/Button03"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:text="bottom" >
</Button>
</LinearLayout>
</LinearLayout>
Which puts the button on the expected place:
Unfortunately this isn't the case in my XML on the top of the post. The ImageView isn't placed on the bottom as the Button in reference XML is.
Any ideas why that happens ?

You should change a setting in ImageView itself, to be precise set android:scaleType="fitEnd" on your ImageView.
The other answers seem to be workarounds, including your own answer. This is not a problem with a layout, but with where inside the ImageView the image is loaded when the dimensions of the image and the screen aren't similar, (i.e. the width/height ratio is very different). By default it would load the image in the middle of the ImageView.

Try using RelativeLayout instead of LinearLayout and use parameter android:layout_alignParentBottom = "true".
EDIT: Try giving layout_height and layout_width as wrap_content for your LinearLayout that holds your ImageView.
Or it might be that the image you are using has extra space above and below it.
UPDATE:
The problem is with the size of the image. It is much larger than the screen size. I would suggest you to programmatically read the screen size of the device with below code:
DisplayMetrics displaymetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
int height = displaymetrics.heightPixels;
int width = displaymetrics.widthPixels;
and set the height and width for imageView programmatically as below:
image_view.getLayoutParams().height = height - 50;
image_view.getLayoutParams().width = width - 50;

Try this inside relative layout
<ImageView
android:id="#+id/imageView9"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:adjustViewBounds="?attr/isLightTheme"
app:srcCompat="#drawable/client_app_footer" />
tested & working as expected

you did not include android:layout_gravity="bottom" line in your imageview.

I have resized photo size from width 2560 to width 270 and finally ImageView went to bottom.

Android ImageView in HorizontalScrollView get's twice the width of screen

I'm trying to make a ImageView inside a HorizontalScrollView, but the imageView gets twice the width of the screen and end halfway out of bounds.
My XML:
<?xml version="1.0" encoding="utf-8"?>
<HorizontalScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/horizontalScrollView1"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:baselineAligned="true"
android:orientation="vertical" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/penguins" />
</LinearLayout>
</HorizontalScrollView>
And a image of what I get (click me!)
Does anyone know a solution to this problem?
Greetings

I copied your xml and using my resource it looks perfect, i believe your resource is bigger than you think it is, you probably should use layout_width and layout_height as fix size and also set scaleType to centerInside.

Scaling an image to max available width, keeping aspect ratio and avoiding ImageView extra space

I have this simple layout XML, and a green_square.png file which is 30X30 pixels
<?xml version="1.0" encoding="utf-8"?>
<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:background="#color/red"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:adjustViewBounds="true"
android:scaleType="fitStart"
android:src="#drawable/green_square"/>
</LinearLayout>
What I'm trying to achieve is scaling the image to fill the parent width, keeping it's aspect ratio with no extra space of the ImageView.
I've added a red background to the ImageView just for reference of the extra space I want to avoid.
Here is my goal

<ImageView
android:id="#+id/game"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scaleType="centerCrop"
android:adjustViewBounds="true"
android:src="#drawable/ic_game"
/>
this works for me. Full width of parent and center crop to keep aspect ratio

It's so simple. Just make the width fill_parent and height wrap_content. Here is the I figured it out.
<ImageView
android:id="#+id/game"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:scaleType="centerCrop"
android:adjustViewBounds="true"
android:src="#drawable/ic_game"
/>

In my view, this ImageView extra layout is a bug. I had the same thing happen. As a result, text that I wanted to follow the green_square followed the extra layout. So what I did was specify the text relative to the bottom of the screen. That way, the text would go over the extra layout. I admit, it wasn't the best solution, but it looks much better than having a huge space between the green_square and the text.

There lots of great answers here which actually works. I just what to share the way I do this now with a more modern XML syntax, the constraint view. Trust me constraint view rooks!
<android.support.constraint.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"
android:background="#394BAB"
tools:context="com.appdomain.app.apppro.ActivityName">
<ImageView
android:id="#+id/nice_img"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="0dp"
android:src="#drawable/green_square"
android:scaleType="centerCrop"
android:adjustViewBounds="true"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
</android.support.constraint.ConstraintLayout>
of course the
tools:context="com.collectsavings.collect.collectpro.LoginAndRegisterPrompt"
and
android:src="#drawable/green_square"
Should all match your app activity context and drawabl resources respectively.

Use scale type "fitCenter" or "fitxy"

Try this,
<?xml version="1.0" encoding="utf-8"?>
<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:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#color/red"
android:scaleType="centerCrop"
android:src="#drawable/green_square" />
</LinearLayout>

Why image don't fill width

I have the following in my main.xml the image marker does not fill the width of the device?
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:screenOrientation="portrait">
<ImageView
android:id="#+id/ImageView01"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:src="#drawable/marker">
</ImageView>
</LinearLayout>

You have your ImageView's height set to wrap_content. This means the ImageView will only take as much space as is needed by the image you select. If you want it to take the entire screen, just change your layout_height to fill_parent.
You'll also want to select an ImageView scaleType with android:scaleType="".

try
android:adjustViewBounds="true"
or check out
image_view_1.xml
in the Android APIDemos.
It should be of help.