Develop Reference

ImageView Scaling for No Apparent Reason

I'm using Android Studio, and have created an ImageView in activity_mail.xml. The layout width and height are set to "match_parent". The scaleType is set to "center" and the source image is 70x70 pixels. When I run the app in the emulator the Image appears on the screen larger than 70x70 pixels. I mean it takes up more than 70x70 pixels on the screen of the phone. I don't know why it's doing this. The app is exclusively in Landscape mode, that might be relevant. Forgive me if I have included extraneous details, I genuinely don't know what information would be relevant to include. I intend to make it so that the image takes up 70x70 pixels on the screen of the phone. What is causing the unintended result, and how could I fix it?

change ScaleType, maybe fit_center instead of just center + android:adjustViewBounds="true” will fit your purposes... another way is to create ImageView with wrap_content sizes placed in some container (e.g. RelativeLayout) with match_parent sizes
also check this visual guide for ScaleType
note that 70px image will be big on devices with HD resolution and significantly smaller on those with e.g. full HD. you should have few versions of your image in proper density buckets (mdpi, hdpi etc.) or just download proper size if your image comes frome some API, so then you can say that you have image with 70dp dimension, not 70px

Fit the entire large image inside the fixed crop window in android (scaling out like nocrop app)

I have an image which has height greater than its width. I want to achieve something like user can pinch zoom out(or scale out) to fit the whole image inside a cropping window having a fixed aspect ratio (for eg: 16:9). If there is any empty space after zooming out then it should be filled with a default colour like black or white. It should work just like nocrop app for Instagram does, but here the cropped image won't be a square image. I am open to using any android libraries also if it can fix the issue.
Something like

issue with android app different layout sizes

In my android app I have a layout which contains many buttons and spinners. I have also added different layouts for the individual screen sizes (hdpi, xhdpi etc.). The problem is when testing my layout-hdpi in the emulator with the Nexus S (indicated as hdpi) it looks fine, but when testing it with Nexus One (also indicated with hdpi) the buttons are overlapping??
In the layouts all sizes are in dp!
So shouldn't I receive the same result with two devices in hdpi?

I had the same problem what you should do is obtain the screen height:width ratio and name it, well ratio.
so your ratio = height/width then instead of using the size of buttons or other elements in exact size in dp, take the size in the form of what part your element takes up in the view.
I think i confused you there, but its easy, see for example:
if you have an image that you want to add on the top half of the screen then dont say height=150dp or width=200dp you screen height was h so your image height would be h/2 and your width would then be h/ratio.
this would also work in the landscape mode, you wont have to find the buttons in the landscape mode because they were out of the screen.

Splash screen which fills the whole samrtphone screen, but not crop

I want to have a splash screen, something like a full picture, which doesn't crop in heigth or width on different smartphone screens.
Now I achieved a splash screen with android:scaleType="fitXY", but now the image is cropped on top or bottom or if the devices screen size changes to another aspect ratio it is cropped on the left and right.
What do I have to do? I've already read the android developer article Supporting Multiple Screens, but I don't get it how to achieve this.
A simple picture in the middle of the screen is just simple to get, but a picture which fills the screen is hard to get. Can you help me pls?

you should use center_crop per this purpose. From the doc
Scale the image uniformly (maintain the image's aspect ratio) so that
both dimensions (width and height) of the image will be equal to or
larger than the corresponding dimension of the view (minus padding).

There is no way to create one single asset and expect it to do not be cropper and to do not create black areas when the application is deployed in different screen sizes.
The android platform is designed to work dynamically with multiple screen sizes that any manufacture can change at any time, including new resolutions that you haven't thought about it yet.
Android can specify minimums for screen hight/width categories in which your resources will fall, but those are generics.
In order to use them, you will have to specify qualifiers in your drawables and create a different splash screen for every qualifier, as for example if you use drawable-w420dp, all the resources there will be used when the screen has a minimum width of 420dp (notice that are not pixels)
So you have two options:
You can use one single splash image and design margins of that image flexible enough in order to cope with the image being cropped in certain cases. You can play with different scaleTypes in your ImageView and take as a reference this website http://etcodehome.blogspot.co.uk/2011/05/android-imageview-scaletype-samples.html even though as commented before, "center-crop" will be your best shot.
You can programatically use a specific image for a specific resolution.
2.1 Put in the assets directory, all the splash images that you want for all the specific resolutions or aspect ratios that you want to use
2.1 Get the screen size of the device with Get screen dimensions in pixels
2.2 Now you can load from the assets the image that you want dynamically

Use the below code
android:layout_width="match_parent"
android:layout_height="match_parent"
which will fill the entire screen.

Try Using Width and Height of image to "match_parent"

Fullscreen Rotating Background Image

Developing an app for Android and I'm required to have a fullscreen image rotate (spin around infinitely, pivoted at the centre of the screen) in the background.
I have tried rotating the ImageView using RotateAnimation which works well, except the image is cropped to the size of the parent view.
I have also tried expanding the parent view to a set size (750dp) but it doesn't work well across all the different screen sizes.
Does anyone know of an easy way to implement this, which would involve scaling to uniformly fit the screen size?
Cheers,
Dylan
Screenshot of the image: