@BindView问题 Attempt to invoke virtual method 'void android ...' on a null object reference

Caused by:java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.Toolbar.setNavigationIcon(int)' on a null object reference 我这边是问题主要是 ButterKnife 版本更新问题， 8.0.

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