Develop Reference

How to solve wrong HEIGHT of IMAGEVIEW in percentage in Android

I´ve tried a few thinks to achive the following thing:
For the discription: I want to have a header with a textview which wraps over the howl page and below this header I want to display three images beside each other. It should be like a image gallery. This layout i want to duplicate.
But my problem is, that I the height of the ImageView is to high and that there is a distance between the sized image and the title. See figure.
On the Left is what I want and on the right is what I got...
Here is my layout code:
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scrollbars="none"
android:layout_weight="1">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:textStyle="bold"
android:text="titel"
android:id="#+id/titel"
android:gravity="center"
android:padding="3dp"
android:textSize="18sp"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/titel">
<ImageView
android:layout_width="0dp"
android:layout_weight="0.208"
android:layout_height="match_parent"
android:id="#+id/image1"
android:src="#drawable/1"/>
<ImageView
android:layout_width="0dp"
android:layout_weight="0.389"
android:layout_height="match_parent"
android:id="#+id/image2"
android:src="#drawable/2"/>
<ImageView
android:layout_width="0dp"
android:layout_weight="0.403"
android:layout_height="match_parent"
android:id="#+id/image3"
android:src="#drawable/3"/>
</LinearLayout>
</RelativeLayout>
</ScrollView>

my best guess is because your ImageView scales your image in a way that it fits into the center of the view and leaves empty space around the top and bottom of the view. try adding android:adjustViewBounds="true" to your ImageView in the xml.
on a side note, when debugging view hierarchy, it's almost always gonna be helpful to go to Android Device Monitor, select your devices to the right, and click Dump View Hierarchy for UI Automator. You can easily find out which view is taking the extra space by hovering your mouse over different view elements.

How can I achieve this view?

I've tried using an HorizontalScrollView with a linearLayout inside. It looked exactly like the picture, but I don't want to use that ScrollView because on the launch, the scrolling bar is shown, and this is not what I want.
I've also tried a relativeLayout with every view aligned with each other, but the last view is scaled down, to fit the small space left.
Any tip?

Try this, You can enable or disable scrolling bar using this setHorizontalScrollBarEnabled()
Scrool.setHorizontalScrollBarEnabled(true)

Gallery is being deprecated. So, the recommended way to achieve this would be HorizontalScrollView. You can turn on/off the scrollbars if you want them not to be shown during launch, and then, after launch turn them on.
This class was deprecated in API level 16. This widget is no longer
supported. Other horizontally scrolling widgets include
HorizontalScrollView and ViewPager from the support library.

Why don't you give a try to andoid Gallery View. That I guess would suffice your need as far as I can visualize it.

Found out a solution:
Created a RelativeLayout with a Horizontal LinearLayout inside. The RelativeLayout (the highest parent) with a width of 1500dp. Then nothing is scalled.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="1500dp"
android:layout_height="fill_parent"
android:orientation="vertical"
android:background="#ffffffff">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/techinc_splash_1" />
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/techinc_splash_1" />
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/techinc_splash_1" />
</LinearLayout>
</RelativeLayout>

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

Android Image Button Layout

Could someone please explain how android uses image button sizes? I seem to be getting odd behavior with my buttons.
I have the following code as an example. I have two buttons that sit at the bottom of my layout. These buttons share 50% of the total width as they sit side-by-side.
Within Abode PS, the two images (used for these two buttons) are actually 2" x 38" or 495x94 pixels. This size is of course larger than the available space in the layout.
I am using edge effects on my buttons to give them definition. Android is cutting the edges off my buttons in order to center then in the available layout space.
This particular layout that I am working on will only allow vertical orientation, in case that helps.
Thank you.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/scrollView1"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:id="#+id/layout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true" >
<ImageButton
android:id="#+id/ImageButton1"
android:layout_width="0dip"
android:layout_height="wrap_content"
android:layout_marginLeft="1dip"
android:layout_marginRight="1dip"
android:layout_weight="1"
android:background="#FF000000"
android:src="#drawable/map4" >
</ImageButton>
<ImageButton
android:id="#+id/ImageButton3"
android:layout_width="0dip"
android:layout_marginRight="1dip"
android:layout_weight="1"
android:background="#FF000000"
android:src="#drawable/buy"
android:layout_height="wrap_content"
android:layout_marginLeft="1dip">
</ImageButton>
</LinearLayout>
</RelativeLayout>

Try using an ImageView and android:scaleType:
http://developer.android.com/reference/android/widget/ImageView.html#attr_android:scaleType
Experiment the values available to see what is the best combination!
Then add a listener to behave like a button...

try use the button and make it with empty text after this set the background .
or :
use the image button and put the source and the background the same image to get button exactly like the image
**you can use the selector to make some beauty for application buttons
Google it it's easy to use ;)

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