试了一下好像打印的东西都是一样的
恩。。wtf的意思是what a terrible failure
可怕的失败：报告一个永远不可能发生的情况。
然后这是官方原文：
What a Terrible Failure: Report a condition that should never happen. The error will always be logged at level ASSERT with the call stack. Depending on system configuration, a report may be added to the DropBoxManager and/or the process may be terminated immediately with an error dialog.
大概是用来打印正常情况下永远不会发生bug？
ps:不是what the fuck哈_(:з」∠)_
Log.e就是单纯的错误。Log.wtf会优先断言（ASSERT）,而且，如果你配置了的话，会生成一个错误报告，然后程序就结束啦。
官方文档：
wtf：
What a Terrible Failure: Report a condition that should never happen. The error will always be logged at level ASSERT with the call stack. Depending on system configuration, a report may be added to the DropBoxManager and/or the process may be terminated immediately with an error dialog.
e：
Send an ERROR log message.
错误级别不同，Log.e代表错误级别的日志，Log.wtf是中断（ASSERT）级别的错误，毕竟是What The Fuck，一看就是严重BUG才骂街了。