android 图标和图片位置，drawable or mipmap?

drawable-<density>/

Directories for drawable resources, other than launcher icons, designed for various densities.

大概意思是，除了应用图标意外，其他的图片都要放在drawable文件夹下

layout/

Directory for files that define your app's user interface like

activity_my.xml

, discussed above, which describes a basic layout for the

MyActivity

class.

menu/

Directory for files that define your app's menu items.

mipmap/

Launcher icons reside in the

mipmap/

folder rather than the

drawable/

folders. This folder contains the

ic_launcher.png

image that appears when you run the default app.

大概意思是：应用图标只放在mipmap文件夹下，而不是drawable

values/

Directory for other XML files that contain a collection of resources, such as string and color definitions.

后来查资料，说放在mipmap文件夹的应用图标，会进行特别优化。但是，感觉这么大手笔，这个文件夹只放一个图标，有点杀鸡用牛刀的感觉呢。