Develop Reference

how to fit imageview to screen in xml? centerCrop vs fitXY

So I'm working on Pacman for Android as a learning exercise. I've got the background set in my activity layout, but I'm having trouble making the background fit properly.
I've tried centerCrop and fitXY, with different results, neither of which work exactly. I want to stretch the view to the dimensions of the screen. It appears however that the image view is restricted to the center, like I have 3 imageviews ... but I have only one.
Any thoughts? Do I have to do some of this in code?
Thanks!
<RelativeLayout 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"
android:background="#000FFF"
tools:context="srg.pmd.GameActivity"
>
<ImageView
android:id="#+id/emptyPacman"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="#drawable/blank_screen"
android:scaleType="fitXY"
/>
First screenshot is fitXY
Second is centerCrop

The image you are using must be 320x480 then only the image will fit the screen other wise it will get distorted here is a link for more info about the image size Android: Background Image Size (in Pixel) which Support All Devices .hope it works for u

Well, nuts to me. The actual png file was wrong -- it was a lot wider than I assumed. Taking a closer look with an image editor revealed the problem.

Why does my striped background scale with such a bad quality?

I have an activity that includes a striped background image. Click to enlarge – this is the original image I'm using. There's also a version with a logo for another activity.
It looks fine as is. I set it as a background in the activity through XML, something like this.
I need the hack as an ImageView to be able to properly centerCrop a logo in the background, but this is irrelevant to the issue, as it persists when setting the background for the RelativeLayout and removing the ImageView.
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<ImageView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:adjustViewBounds="true"
android:scaleType="centerCrop"
android:src="#drawable/background_striped" />
Note that since there has to be a logo inside the image, I can't stretch it artificially or have it repeat.
In the layout preview screen, it looks like this:
In the emulator, it looks like this:
As you can see, it looks quite bad, compared to how I'd expect it:
Naturally, I've created versions of the striped background for all display resolutions (from ldpi to xhdpi), but they always seem to be scaled in a pretty bad way.
Is there any way to get the background scaled in a higher quality? Just using the xhdpi version won't result in better quality—it will just make the scale result worse and more washed out.

For scalable drawables it is better to use a 9-patch. You can create one with your small striped background image using the android 9-patch tool:
http://developer.android.com/tools/help/draw9patch.html

Try using repeat. I tested it and it seems to look fine.
<?xml version="1.0" encoding="utf-8"?>
<bitmap xmlns:android="http://schemas.android.com/apk/res/android"
android:src="#drawable/background_striped"
android:tileMode="repeat" />

how to keep aspect ratio with different android devices

So I'm trying to put an image inside a scrollview and have the image stretch to fit different sized screens. It'll stretch horizontally, but vertically it always comes out messed up.
I've read so many pages of people with similar problems, but their solutions never work for me. I've tried every different combination possible using different scaleType,layout_width and layout_height, along with trying changing other things around. The closest I've gotten to getting it to work is shown in the code below, using scaleType="centerCrop". It's the only one that stretches the image vertically in ratio, but it cuts off a big chunk of the image from the top and bottom, it'll scroll up and down the image, but only the middle part shows.
The image is a 480x5500 jpeg, if that matters. Originally before I started messing with all that, the app worked just fine on my phone, but then later I realized the image was crunched when I tried it on a tablet. There's gotta be a way to do this in the xml right? I really don't want to have to do things with the image in the java code part. Also I'm hoping to be able to do this using just one image, I don't want to have use a different image for different screen sizes. Please help, thanks.
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/scrollView1"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ImageView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:scaleType="centerCrop"
android:src="#drawable/paper" />
</ScrollView>

may be this help you,
make both height and width wrap_content of ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
and no need ScrollView here.

Try using custom ImageView like AspectRatioImageView mentioned here:
https://stackoverflow.com/a/4688335/944070

the next sample is more than what you ask for :
http://www.androidviews.net/2012/11/photoview/
https://github.com/chrisbanes/PhotoView/tree/master/sample
https://play.google.com/store/apps/details?id=uk.co.senab.p
hotoview.sample
it fits the image to the screen , plus it allows to zoom in/out using pinching gestures.

Android inset transparent drawable

So I have a PNG as shown below. The white inner in the image is transparent.
My problem is that this image isn't really scalable for different size screens on Android devices.
I would like to know how I can do this either in code or preferably, xml. Basically I am looking for a grey square with a transparent circle inset.
Also, there is a nice effect on the inner border of the grey, is this possible in code?
I know how to do the inverse (bitmap with rounded corners) but how would I do this? Any ideas appreciated, thanks.
Edit:
So, the only thing I have tried is android:scaleType="centerCrop"

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="fitCenter"
android:scaleX="0.7"/>
</LinearLayout>
Can you try this one.

It's not clear from your question why the image is not scaling properly for different screen sizes.
Using NinePatch PNG format you have full control how the image scales. For example, this enables you to force that only the image gray areas are extended, keeping the circle format, if that is your problem.
The documentation can be found here: Draw 9-patch
Regards.

Layout problems with 9-patch background image

I have a 9-patch background image for my layout and it works fine when the display resoluton is smaller then the image (800x480px). But when I test it on a device with a bigger resoluton, for example 1280x800px, than the layout is broken. Here are two pictures:
The normal and broken layout
The 9-patch image
Here is the relevant layout-code:
<LinearLayout
android:id="#+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="#drawable/chalkboard"
android:gravity="top|center"
android:orientation="vertical" >
All in all, the 9-patch doesn't work when the image scales up. But what's the reason and how can I handle it?
Best regards!

You are stretching the frame as well. Just don't stretch the frames on the side. This should do the work: