问题
When I try to deploy my project to the emulator the compile fails with a bunch of Cannot find symbol errors. I have to rebuild the project then deploy everytime I make a change. This just started in 0.1.6 for me. Anyone else seeing this?
回答1:
As a temporary workaround, try turning off Preferences > Compiler > Use External Build.
(as suggested in this issue: https://code.google.com/p/android/issues/detail?id=56884)
回答2:
Clicking "Sync project with Gradle files" resolved this for me.
回答3:
I used the following answer and it worked great:
https://stackoverflow.com/a/19223269/1531683
You can do "File" -> "Invalidate Caches...", and select "Invalidate and Restart" option to fix this.
回答4:
Same here. Check this for updates: https://code.google.com/p/android/issues/detail?id=56884&colspec=ID%20Type%20Status%20Owner%20Summary%20Stars
回答5:
As a workaround, deleting the out folder before rebuilding the project solves the problem!
回答6:
Just Click Build -> Clean Project. It will solve the problem of missing "R.java".
回答7:
Adding the following into the dependencies worked for me:
compile 'com.android.support:appcompat-v7:20.+' compile 'com.android.support:support-v4:21.0.0'
回答8:
Using java 7 inner classes instead of lambda functions provided by retro-lambda solved my issue.
来源：https://stackoverflow.com/questions/17241855/cannot-find-symbol-in-android-studio-without-rebuilding-project