① butterknife加入到你的libs,空指针 1.选择你的项目右键–>properties–>java compiler–>Annotation Processing(找不到请看②)–>勾选enable project specific settings 2.展开Annotation Processing–>Factory Path –>enable project specific settings–>add JARs–>butterknife.jar ②找不到Annotation Processing选项 1. Help –> Install New Software… 2. Work with 中选择 Juno - 3.在下面的 Name 中选择 Programming Languages 下 的 Eclipse Java Development Tools package 4.Next–>Finish–>OK了