错误提示（需得打开编辑器log文件才能看到全部log，Unity3d只显示一部分）：
Error building Player: CommandInvokationFailure: Unable to convert classes into dex format. See the Console for details.
C:/Program Files/Java/jdk1.8.0_05\bin\java.exe -Xmx2048M -Dcom.android.sdkmanager.toolsdir="F:\adt-bundle-windows-x86_64\sdk\tools" -Dfile.encoding=UTF8 -jar "D:\develop\Unity5.3.7\Editor\Data\PlaybackEngines\AndroidPlayer/Tools\sdktools.jar" - warning: Ignoring InnerClasses attribute for an anonymous inner class
(com.tendcloud.tenddata.game.ae) that doesn't come with an
associated EnclosingMethod attribute. This class was probably produced by a
compiler that did not target the modern .class file format. The recommended
solution is to recompile the class from source, using an up-to-date compiler
and without specifying any "-target" type options. The consequence of ignoring
this warning is that reflective operations on this class will incorrectly
indicate that it is *not* an inner class. rouble writing output: Too many method references to fit in one dex file: 67088; max is 65536.
You may try using multi-dex. If multi-dex is enabled then the list of classes for the main dex list is too large.
References by package:
4 android.accessibilityservice
4 android.accounts
106 android.animation
451 android.app
17 android.app.job
2 android.appwidget
53 android.arch.core.internal
105 android.arch.lifecycle
1 android.bluetooth
241 android.content
55 android.content.pm
111 android.content.res
58 android.database
25 android.database.sqlite
256 android.graphics
130 android.graphics.drawable
3 android.graphics.drawable.shapes
3 android.graphics.pdf
35 android.hardware
5 android.hardware.display
11 android.hardware.fingerprint
24 android.location
259 android.media
19 android.media.browse
92 android.media.session
69 android.net
6 android.net.http
7 android.net.nsd
16 android.net.wifi
2 android.nfc
2 android.nfc.cardemulation
71 android.opengl
311 android.os
1 android.preference
28 android.print
5 android.print.pdf
18 android.provider
8 android.renderscript
9 android.security
6 android.security.keystore
10 android.service.media
31 android.support.annotation
14 android.support.compat
153 android.support.constraint
125 android.support.constraint.solver
375 android.support.constraint.solver.widgets
14 android.support.coreui
14 android.support.coreutils
216 android.support.customtabs
16 android.support.design
309 android.support.design.internal
1527 android.support.design.widget
14 android.support.fragment
335 android.support.graphics.drawable
14 android.support.graphics.drawable.animated
14 android.support.mediacompat
843 android.support.transition
解决方法：
1.去掉不需要的jar包
2.导出android studio工程使用多个multi-dex:true 选项
官方文档解决64k限制方法：https://developer.android.com/studio/build/multidex
相关文章 https://medium.com/@abhpatidar/solving-unity-dex-issue-538e134c8809