1.dependencies中添加依賴
implementation 'com.jakewharton:butterknife:9.0.0-SNAPSHOT' annotationProcessor 'com.jakewharton:butterknife-compiler:9.0.0-SNAPSHOT'
2.buildscript->repositories和allprojects->repositories中均添加
maven { url "https://oss.sonatype.org/content/repositories/snapshots" }
3.Sync，大功告成= =；