Android - no_image

From the Google-android source code

nodpi: Fallback

• A drawable inside the res/drawable-nodpi/ folder is valid for any screen density. Eg. drawable-nodpi/ic_icon.png The above icon will will look small on xxxhdpi devices and big on ldpi devices.

  drawable-hdpi/ic_icon.png drawable-nodpi-21/ic_icon.xml In android 21 hdpi devices ic_icon.png will be used and in android 21 xhdpi devices ic_icon.xml will be used.

anydpi: Takeover

• A drawable inside drawable-anydpi is also valid for any screen density but anydpi variant has more priority over any density specific variant.

  Eg. If we have res/drawable-anydpi/ic_icon.xml and res/drawable-xxxhdpi/ic_icon.png then ic_icon.xml will be used even in xxxhdpi devices.

  -Most of the times -anydpi used in conjunction with other qualifiers. A good example is anydpi-v21 as vector drawables were introduced in android 21 , so after that we usually have res/drawable-anydpi-v21/ic_icon.xml (Vector drawable) and res/drawable-xxhdpi/ic_icon.png. The vector drawable (ic_icon.xml) will be used in all android 21+ devices and ic_icon.png will be used in xxhdpi devices runing in android 4.4 or older

credit goes to @swayangjit