your android sdk is,Unity3d - Android Build : Android SDK is outdated

Unity3d - Android Build : Android SDK is outdatedSDK Build Tools version 20.0.0 < 21Test on:- Mac OSX Yosemite- Unity3d 4.6.1[Warning]

[Solved]1. choose "continue" if you want to use current version build tool, but this warning will ask everytime when you build apk file.OR2. choose "Update SDK", it's take a long time until Unity3d (not responding) as below image, i'm testing with internet 3G. If it's not responding i choose "Force Quit"*check your running task by press[alt option]+[command⌘]+[esc]

OR

3. choose "Cancel"

[recommended]

Open your android sdk folder for example "adt-bundle-mac-x86_64-20140702 ▸ sdk ▸ tools" then double-click "android" execute file.

It's will show an Android SDK Manager, you should see "Android SDK Build-tools 21 Not Installed", click on checkbox then click "Install x packages..."

After that click "Android SDK License" on left panel, click "Accept License" radio button on right bottom, the last one click "Install" and wait until loading was done! you will back to unity3d and try to build apk again.

It's work.