I read a topic about multiple screen support, but I don't understand why I need a different picture for every screen size if I can stretch image by setting
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#drawable/bk"
for every screen.
You don't have to have a different image for each screen size. You certainly can just use fill_parent and just use the same image. The only issue is that it usually won't look as good. In fact, in some cases it will look absolutely terrible. Assuming that you're fine with your image being stretched though, you can just use one image.
If your background image is not a plain image, and has a lot of detail, then it renders better if it is the exact size needed. Shrinking a large image to small may make it look grainier than you want.
However, you can still do it. Make sure to make AVDs with different screen sizes, so you can see how it might look.
Related
I have a JPEG photo which I want to use to as a background for one of the screens.
I want the behaviour to be simlar to the css backgroundSize: cover property. (Play with the following tool to see what I mean: https://davidwalsh.name/demo/background-size.html)
For iPhone, this issue is fairly easy, as you can literally have several different versions of the same image depending which iPhone the app is being installed on.
For Android, this is much more difficult as they have various different aspect ratios and resolutions.
Therefore my question is, how can I specify an image that covers the entire screen.
You can always fake this by adding the imageview inside a View and calculate the proper height/width you need to cover the screen (get the shortest side and scale it up and multiply the other side by the original ratio).
You could also use https://github.com/AndreaVitale/imageview that supports a cover mode
For Android, My suggestion is to use 9-patch Image instead of normal image. It will stretch it self to entire Screen, if you placed image as background
of Window it self as well as worked for ImageView perfectly.
Thank you.
I created an image to use for an android splash screen and it displays properly on my phone however when I open the app on a phone with a larger screen it pixelates. So I was wonder if I should create more than one image and if so what sizes should I set for other images because I know I can't use the same sizes as I used for the app icon?
If the images are pixelated
then you need to add larger images for each screen size under your
res folder. sizes depends on your target
or
scale the images. to be safe, make it bigger
it might help you: am I supposed to make images larger for tablets, or same size as handset?
you could probably use draw-9-patch to state which area of the picture can be extended.
Google draw-9-patch
I worked with two approaches so far:
Screen composition
One approach can be using a composition of brackground and a logo. You can have the logo as big as you need (for high resolution screens) and the background as a repeatable texture (it all depends on your design approach) or a gradient or other composition (less prone to pixelation errors).
As big as possible approach
If one image is your approach, you should do a research to know the currently most used and biggest android screen used (https://developer.android.com/about/dashboards/index.html). Knowing that one, you can design your image for that [high] resolution and set the scaleType as CENTER_CROP. With that, you will ensure that the image will be centered, inside the screen, keeping aspect ratio, and at its highest resolution [keep an eye about logos/graphics positions if you want to be sure that they remain visible even in thin screens).
For icons, the best way is Draw 9-patch
Otherwise, you need to scale the images into drawable-xx (res directory), here the explanation
in my android application, I want to display some images of plants (i have more than 100 of them) a i also want to support different screen sizes, but my problem is i can not have images for every screen density in res/drawable folder, because size of my application horribly increase. Is there any solution how to do this? (maybe in code) Thanks a lot.
From what I understand, you want to have the text wrap around the image. You could best achieve this using this library.
As for the images, you would only need to store them at a size that looks good on the largest devices you are looking to support. For the other devices, you would just scale those down. If you're going to use the above library, you might need to set the following parameters on the ImageView in the XML file to have it scale down correctly:
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.5"
Note that you will need to fiddle around with these (especially the weight) so that you get the best fit for your application.
EDIT: To conform to your requirement in the comment, the best way to go would be to use a WebView. This does mean you will need to create HTML code for your articles, which would completely change the question.
What you could try is to have a LinearLayout surrounding the image and add TextView objects to it programatically. There are good chances that this will look bad depending on the amount of text you will be adding.
i'm working on an Android application and i'dd like to put a background image. my problem when i set the android:background is that the image is show on all the screen.
i'dd like to have my background on only 50 % height and wide.
thank you
This depends on screen size of devices. I recommend that You read about supporting multiple screen sizes:
http://developer.android.com/guide/practices/screens_support.html
You can also do this programmatically, but is a bad practise. To get the result You want, You have to set a layout.xml for every screen size. It is also recommended that You better put that image inside an imageView, because of a good scaling on different devices.
I have an iOS app that uses unique textured backgrounds (think of a game title screen or something) on each of the screens that I am trying to port to Android. On iOS they knew the resolutions and just designed the backgrounds around those. Obviously that isn't possible on Android.
What is the best way to put a textured/non-repeatable background into Android that works on various screen sizes and aspect ratios?
The solutions I have thought of so far are:
Fit the shortest dimension and allow the image to go off the edge of the screen for the larger dimension
Make the background image large and center it, then make it stretch out beyond the edges when the resolution is smaller than the image
Stretch the image to just fit (this is ugly and I'd like to avoid it)
Create a different version of the image for each resolution. (This seems way beyond the scope of what is possible for this project.)
As far as I can tell in Android, 1. and 2. aren't possible out of the box because background images set the size of the view to match their size (you can't tell it to just extend beyond the edges, please correct me if I am wrong).
What solutions would you use in this situation?
Use an (match_parent) ImageView to simulate back ground image. (By adjusting the scale type of imageview you can get the result of point 1,2)
http://developer.android.com/reference/android/widget/ImageView.ScaleType.html
Use 9-patch image. You can specify which part of your image can be stretched. For your case I suggest adding a small "margin" to your image, and make it stretchable using 9-patch. Only the margin will be stretched, maintaining the aspect ratio of your image.
android developer 9-patch
Create a different version of the image for each resolution.
As you're probably aware, Android can run on a wide variety of devices with varying resolutions and screen densities. To be fully compatible with all of them takes a bit of graphics work; you need resources for each possible screen density (and in this case, resolution).
For full details, see Supporting Multiple Screens in the Android developer documentation.
Unless something has gone seriously wrong in your development process, you should have the original files (e.g. .psd) to work with when creating these resources.