Develop Reference

How to have a scrollable floating Cardview like this?

Does anyone know how to have a floating Cardview like this?
http://chairnerd.seatgeek.com/images/autocomplete_checkout.gif
The background image should be able to change programmatically and the cardviews should be scrollable. And the position of the first Cardview should be somewhere below the image. Thanks in advance!

I figured it out myself and I will post my solution here in case anyone run into the same situation.
Here how the layout file should look like:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:focusableInTouchMode="true"
android:background="#color/bgGrey">
<ImageView
android:layout_width="match_parent"
android:layout_height="125dp"
app:srcCompat="#drawable/soccer"
android:id="#+id/imageView"
android:scaleType="centerCrop"/>
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_marginTop="120dp">
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="6dp">
EDIT: Within the LinearLayout, something like a place holder should be added. Otherwise a part of the content at the end would not be shown. So I used a textview to do so.
<TextView
android:layout_width="match_parent"
android:layout_height="120dp" />
Note: The height here should match the marginTop in the LinearLayout

Yes it is a cardView directly on a ScrollView, or a ListView simply with the item's layout with background transparency.
The scrollview/listview is placed on a FrameLayout or RelativeLayout. Either there is a padding/margin on top, or a "stub" first element which is transparent".
Bellow (declared first in the parent layout) the scrollview/listview you can place an image or any other static component whatsoever.
And above you can place other floating components (like the Check-out button on your example)

Android activity border that can not be removed?

So I have this
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/mainParent"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/bgdark"
android:orientation="vertical"
>
<ImageView
android:id="#+id/imageView1"
android:layout_width="match_parent"
android:layout_height="76dp"
android:src="#drawable/myheader_250x60"
/>
<ListView
android:id="#+id/mainListview"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</ListView>
</LinearLayout>
Note I have now edited this post. I was using a grey background image, so I thought that was what was visible to right/left of header image.See below for an image showing the problem.
However, moving the background to the listview did not solve the problem. Hence it would seem it is the imageview that somehow has a left/right border in grey. As i have set width to "match_parent" it should have taken he maximum width.
The problem is that to the top/right of header there's a grey pixel border? which I would like to remove if possible.

Try scaleType attribute for your ImageView.
Anothrer way - replace
android:src="#drawable/myheader_250x60"
for
android:background="#drawable/myheader_250x60"

Try using fill_parent instead of match_parent except in listView height . Use wrap_content in listView height

set this scletype property
android:scaleType=fitXY
and set image to imageview like this
android:background="#drawable/myheader_250x60"

ImageView won't fill parent

I have a ScrollView on one of my screens. I want the right edge to have a shadow. I decided the easiest way to do this was to make the child of the ScrollView a RelativeLayout, and have two children of the RelativeLayout -- one being a LinearLayout that will house the layout of the screen, and the second View being the shadow.
Like so...
<ScrollView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scrollbars="none" >
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<!-- stuff -->
</LinearLayout>
<ImageView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:src="#drawable/shadow"
android:layout_alignParentRight="true"
/>
</RelativeLayout>
</ScrollView>
Unfortunately, this doesn't quite work. The ImageView is forcing its dimensions to be the size of the image file. It will not stretch vertically to be the height of the RelativeLayout. I've also tried "match_parent" to no avail. The image is a 9-patch.
Ideas?

Applying drawable content as the source of an ImageView somewhat carries with it an inherent requirement that you want the view to do what it can to accomodate the content without modifying the content itself very much. Typically, this is the behavior you would want out of an ImageView.
What you really want is the behavior you get by setting drawable content as the background of a view, for which you don't really need ImageView at all. A background is designed to simply stretch, fill, etc. to whatever size the view is. Also, since you are using RelativeLayout you can tell the view to match the bound of the view you are shadowing by adding an id and some extra layout_alignparameters.
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<LinearLayout
android:id="#+id/content_layout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<!-- stuff -->
</LinearLayout>
<View
android:layout_width="11dp"
android:layout_height="fill_parent"
android:layout_alignParentRight="true"
android:layout_alignTop="#id/content_layout"
android:layout_alignBottom="#id/content_layout"
android:background="#drawable/shadow"
/>
</RelativeLayout>

try this
<ImageView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:background="#drawable/ic_launcher"
android:scaleType="fitXY"
android:layout_alignParentRight="true"
/>
here is what I get
and code id
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:fillViewport="true"
android:scrollbars="none" >
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<!-- stuff -->
</LinearLayout>
<ImageView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_alignParentRight="true"
android:background="#drawable/ic_launcher"
android:scaleType="fitXY" />
</RelativeLayout>
</ScrollView>

Your problem has nothing to do with the ImageView or 9-patch itself, but rather with the fact that you're wrapping everything in a ScrollView. A ScrollView will automatically force its children direct child to wrap its content, no matter whether you tell it to FILL_PARENT or MATCH_PARENT - both do exactly the same thing by the way; the only difference is the name, which reflects better the actual behaviour of the flag.
Fortunately ScrollView provides a way to force it to fill the viewport with a flag, which will make the behaviour pretty similar to setting FILL_PARENT to a regular view. Either add the attribute android:fillViewport or use setFillViewport() from code.
Edit: Just to be clear, you need to set that flag on the ScrollView. Also, if it's the ScrollView that should have the shadow, can you not send your 9-patch as background to it? I suppose it does depend on what your actual image looks like. Regarding you comment: yes, the RelativeLayout is flexible in terms of positioning and sizing children, but any child will still be bound to the size of its parent.
I do have the feeling that some of us may be working towards something different than what you have in mind. It would definitely help to clarify things with a simple drawing.

You wanted a Shadow towards the right of your image, Then use single layout with Horizontal Orientation, It's good that you have decide to use Relative Layout. Use
android:orientation="vertical"
inside this layout, add those two images. If you still have a doubt, give me those two images or sample images, i will give you the code

How to make image fill RelativeLayout background without stretching

In my Android project, I am not quite sure how to make my background image fill the entirety of the RelativeLayout root element in XML, which is the size of the screen. I want to be sure that this works for all aspect ratios, so the image will clip vertically or horizontally as necessary. Does someone know how to do this easily? I've only seen questions regarding ImageViews and Buttons, but not really generic Views.
My XML file currently:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/enclosing_rl"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#drawable/background"
android:fitsSystemWindows="false">
<!-- Other elements -->
</RelativeLayout>

Other than turning your image into a nine patch I don't think this is possible. What you could do instead is-
Add an ImageView as the first view in your RelativeLayout.
Set layout_centerInParent to true.
Have the layout_width and layout_height set to match_parent.
Then set scaleType to centerCrop.
That will make sure the image fills the screen without any distortion, but depending on screen size/orientation either some of the top/bottom or left/right of the image may be cut off.
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerInParent="true"
android:scaleType="centerCrop"
android:src="#drawable/background" />
Any other views in the RelativeLayout will appear on top of the ImageView, as long as it is the first view in the RelativeLayout (when you are in the xml).

Create a bitmap drawable XML resource in your res/drawable folder:
<?xml version="1.0" encoding="utf-8"?>
<bitmap xmlns:android="http://schemas.android.com/apk/res/android"
android:src="#drawable/background"
android:tileMode="repeat" />
Use that drawable as background instead of #drawable/background

according to this answer If you want your ImageView fill your RelativeLayout,use align parameters for ImageView.
you can put all of your views to a LinearLayout and set align parameter to your background ImageView:
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="#drawable/my_background"
android:scaleType="centerCrop"
android:layout_alignTop="#+id/my_views"
android:layout_alignBottom="#+id/my_views"
/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/my_views"
android:orientation="vertical" >
<!-- stuff -->
</LinearLayout>
</RelativeLayout>

Its smart and 100% working answer is to set the property scaleType of image view !
android:scaleType="fitCenter"

Displaying an image larger than the device's screen

I'd like to display an image larger, in size, than a device's screen without resizing the image. It has to be centered on the screen. How can I do this?

use scrollview with image view and set height of that scroll view
Example
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ImageView
android:id="#+id/accountIcon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</ScrollView>

I noticed that I need to use normal (vertical) and horizontal ScrollView in order to scroll both directions. Let me know please if there is another way.
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/scrollView" >
<HorizontalScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/horizontalScrollView">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/imageView3"
android:src="#drawable/big_map"/>
</HorizontalScrollView>
</ScrollView>
It started display form left upper corner of the image. If I tried to use android:layout_gravity="center" then I got white part on right or bottom. So centering is not working for me.
Option 2: use WebView control, and load it with image onCreate.

Derive from View, overwrite onDraw and draw it on the screen.

You can also work with framelayout. The layout can be bigger than the screen