Android Image Resolution

                            ldpi     mdpi     hdpi    xhdpi    xxhdpi      xxxhdpi
Launcher And Home           36*36    48*48   72*72    96*96    144*144     192*192
Toolbar 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


ldpi (low) ~120dpi
mdpi (medium) ~160dpi
hdpi (high) ~240dpi
xhdpi (extra-high) ~320dpi
xxhdpi (extra-extra-high) ~480dpi
xxxhdpi (extra-extra-extra-high) ~640dpi   ( ALMOST NEER USED! USE ONLY FOR launcher icon. )

Android apps should provide 6 image sizes: ldpi (0.75x), mdpi (1.0x), hdpi (1.5x), xhdpi (2.0x), xxhdpi (3.0x), and xxxhdpi (4.0x).

ВСЕ ОЧЕНЬ ПРИМЕРНО, Т.К. xhdpi - РАЗНЫЙ НА РАЗНЫХ УСТРОЙСТВАХ:
https://material.io/resources/devices/

https://stackoverflow.com/questions/13024272/android-background-image-size-in-pixel-which-support-all-devices/40255870#40255870

Full-Screen
LDPI:
Portrait: 200x320px
Landscape: 320x200px
MDPI:
Portrait: 320x480px
Landscape: 480x320px
HDPI:
Portrait: 480x800px
Landscape: 800x480px
XHDPI:
Portrait: 720px1280px
Landscape: 1280x720px


Display 5.00-inch (720x1280)
OS Android (v.7.0 = API Level 24) - Android Nougat (2016)

https://source.android.com/setup/start/build-numbers
version, API level

https://developer.android.com/about/dashboards
растпространенность разных экранов