参考 http://www.it165.net/pro/html/201404/12375.html

 

@Optional @InjectView

@Optional @onClick

 

 

1.@Optional @InjectView(R.id.might_not_be_there) TextView mightNotBeThere;

2.

 

3.

@Optional @OnClick(R.id.maybe_missing) void onMaybeMissingClicked() {

4.

// TODO ...

5.

}

 

无需强转  

TextView firstName = ButterKnife.findById(view, R.id.first_name);