屏幕大小
| 尺寸 | px | dp |
|---|---|---|
| MDPI | 480*320 | 480 * 320 |
| HDPI | 960*540 | 640*360 |
| XHDPI | 1280*720 | 640*360 |
| XXHDPI | 1920*1080 | 640*360 |
| XXXHDPI | 2560*1440 | 730*410 dp |
Launcher图标大小
| 尺寸 | px |
|---|---|
| MDPI | 48*48 |
| HDPI | 72*72 |
| XHDPI | 96*96 |
| XXHDPI | 144*144 |
| XXXHDPI | 192*192 |
ActionBar， Dialog，Tab，Menu图标大小
| 尺寸 | px |
|---|---|
| MDPI | 32*32 |
| HDPI | 48*48 |
| XHDPI | 64*64 |
| XXHDPI | 96*96 |
| XXXHDPI | 128*128 |
Notification Bar图标大小
| 尺寸 | px |
|---|---|
| MDPI | 24*24 |
| HDPI | 36*36 |
| XHDPI | 48*48 |
| XXHDPI | 72*72 |
| XXXHDPI | 96*96 |
Contextual图标大小
| 尺寸 | px |
|---|---|
| MDPI | 16*16 |
| HDPI | 24*24 |
| XHDPI | 32*32 |
| XXHDPI | 48*48 |
| XXXHDPI | 64*64 |
图标下载
http://www.flaticon.com
这个是我最常用的，资源很多（需翻墙）。
https://design.google.com/icons/
https://github.com/google/material-design-icons
谷歌提供的
图标开源项目
https://github.com/mikepenz/Android-Iconics
强力推荐这个开源项目，我目前在用的，有了这个，图标问题完美解决。
下面是作者的原话：
If you are an app developer you will know the problem. You start an app but require many different icons, in different sizes (ldpi, mdpi, hdpi, xhdpi, xxhdpi, xxxhdpi), different colors, and different variants.
If you get the icons as vector (.svg) or there are many changes over the time, you will always have to get the correct drawables again.This consumes a lot of time!
Now there’s an easy, fast, and small solution for this! The Android-Iconics library.
This library allows you to include vector icons everywhere in your project. No limits are given.
Scale with no limit, use any Color at any time, provide a contour, and many additional customizations…
Use the icons in the variation you need them.
PS：而且该项目的readme中包涵很多设计和资源下载的网站
扁平化颜色
Material Palette调色板
这个网站可以根据你选择的颜色，自动生成Material Design对应的颜值
http://www.materialpalette.com/blue/blue