Android activity image background size

I am a bit confused on creating an image which will be acting as a background for my activities. So, in short, my aim is that my application should be a开发者_如何学Cble to fit the different screen sizes. Therefore, what size in pixel should my three images be to be able to fill the screen of the device in ldpi, mdpi and hdpi?

Thank you for any response.

In ldpi-folder, the recommended size is 240x320.

In mdpi-folder, the recommended size is 320x480.

In hdpi-folder, the recommended size is 480x800.

More information about this subject can be found here.

ldpi 240x320.

mdpi 320x480.

hdpi 480x800.

xhdpi 640*960.

xxhdpi 960x1440.

updated Jan,09,2016

                            ldpi     mdpi     hdpi     xhdpi    xxhdpi     xxxhdpi
Launcher And Home           36*36    48*48   72*72    96*96    144*144    192*192
Action Bar And Tab          24*24    32*32   48*48    64*64    96*96      128*128
Notification                18*18    24*24   36*36    48*48    72*72      96*96
Background                  240*320  320*480 480*800 768*1280 1080 *1920  1440*2560

updated Sep,23,2016

@CDrosos thanks.

This is helpful also: Device Metrics - design.google.com/devices

04 / 2013 : I have read another specifications in android developers

xlarge screens are at least 960dp x 720dp large screens are at least 640dp x 480dp normal screens are at least 470dp x 320dp small screens are at least 426dp x 320dp

http://developer.android.com/guide/practices/screens_support.html