灰屏/重启后，Android Studio NullPointerException（无错误消息）

Question

I was programming in Android Studio, on MAC OS X macOS Sierra.

I was debugging code on one emulator, then I started next emulator with different phone. Then accidentally laptop restarted (with the grey screen https://i.kinja-img.com/gawker-media/image/upload/s--HPvl05ih--/c_scale,f_auto,fl_progressive,q_80,w_800/18mfougmh04injpg.jpg ).

After boot everything come back, Android Studio too. But I can't debug my apps. I have

Error:java.lang.NullPointerException (no error message)

This happening everytime I try to run my app. It is on my company project, from git. I tried different versions of code.

I tried also (with chronology):

• reinstall Android Studio

• reinstall SDK, Virtual Devices

• reinstall Android Studio after completly delete it from Mac, using terminal ( How to completely uninstall Android Studio? )

• reinstall Java (uninstall with the tip from Java webpage ( https://www.java.com/en/download/help/mac_uninstall_java.xml )

I don't know what I can do next besides reinstalling OS.

Thanks

Answer 1

Okay.

After that post I also tried cleaning cache, logs and again reinstall Java JDK. Nothing helped.

Unfortunately the only solution which helped - format and reinstall system.

Answer 2

在android studio中尝试File-> Invalidate caches / Restart...。

Answer 3

您必须将“ .gradle”文件夹删除到根项目中，然后重新启动android studio。