 
                        Error:(23, 81) 错误: @Bind fields must extend from View or be an interface. (...DemoActivity.mRecycler)
    @Bind(R.id....toolbar)Toolbar mToolbar;
    @Bind(R.id...._recycler)RecyclerView.Recycler mRecycler;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout....);
        ButterKnife.bind(this);
    }
if (!isSubtypeOfType(elementType, VIEW_TYPE) && !isInterface(elementType)) {
  error(element, "@%s fields must extend from View or be an interface. (%s.%s)",
      Bind.class.getSimpleName(), enclosingElement.getQualifiedName(), element.getSimpleName());
  hasError = true;
}
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@Bind(R.id...._recycler)RecyclerView.Recycler mRecycler;这行代码好像有问题。应该是
@Bind(R.id...._recycler)RecyclerView mRecyclerView;吧这里你并不是用的RecyclerView,而是用的RecyclerView的内部类Recycler,而Recycler并没有继承自View。应该是你写错了。
搞了一会儿发现了,好丢人,.Recycler studio关联出来的。。