android开发中遇到莫名奇妙的错误

1、build工程的时候出现下面的错误

Error:Execution failed for task ':app:buildInfoDebugLoader'.

> Exception while doing past iteration backup : Source /Users/all-cui/Documents/android-project/hengshuicheguansuopdawaiguanchayan/AppearenceInspec/app/build/intermediates/builds/debug/21232079045707/classes.dex and destination /Users/all-cui/Documents/android-project/hengshuicheguansuopdawaiguanchayan/AppearenceInspec/app/build/intermediates/builds/debug/21232079045707/classes.dex must be different

解决方法：Build->ReBuild Project就可以解决了。

2、FloatingActionButton在xml加入悬浮按钮报错，Binary XML Error：Inflating error                  解决方案：将支持库appcompat-v7、cardview-v7、design以及编译版本升级到最新的版本即可解决问题。