Drawable folders in res folder?

Question

What is the difference between the three drawable folders in the res folder in the project hierarchy? If I have an image to put into a folder, which folder do I put it in? <

Answer 1

Also interesting, though not specific to images, is how android handles resources. It gives them a load order, where more specific means it'll get picked over less specific.

For example, you have three String values in strings.xml in your values folder. You also have one specific string in a folder called values-en. When android opens your app and your locale matches en, it will load two defaults from the values folder and the third, more specific string, from values-en. If your locale is ru, it will just use the default instead because you have no values-ru folder.

The same is true for images. If android can't find images for your specific screen variant, it will use defaults from the drawable folder.

In my opinion it's good practice to have default values/images in your generic folders like values/drawable and specific values/images in specific folders. This way both current and future devices will at least have a way to display your content until you can provide specific versions.