Android 2.2(Froyo; API Level 8)で追加されたロギング関数。重大度(severity)レベルが最も高いASSERTとして記録される。
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
https://developer.android.com/reference/android/util/Log.html#wtf(java.lang.String,%2520java.lang.String)DropBoxManagerand/or the process may be terminated immediately with an error dialog.
メモ："What The F**k"の略ではない。ないよ？
