RoboFragment中的InjectView

Question

我想从xml布局注入一些视图到RoboFragment但不幸的是我得到了Nullpointer异常.由于RoboGuice(除了是一个很好的DI框架)只有非常少的文档,我不知道我是否可以@ContentView(R.layout.fragmentlayout)用来注释我的RoboFragment.我应该做些什么呢？我现在做的是:

public class TestFragment extends RoboFragment {

    @InjectView(R.id.upBtn) private Button upBtn;   

    @Override
    public View onCreateView(LayoutInflater layoutInflater, 
            ViewGroup container, Bundle savedInstanceState) {

        super.onCreateView(layoutInflater, container, savedInstanceState);
        View view = layoutInflater.inflate(R.layout.fragmentlayout, container, false);
        RoboGuice.getInjector(getActivity()).injectMembers(this);
        upBtn.setSelected(false);   // <------ Null pointer here
        return view;
    }
}

Answer 1

如果你看一下RoboFragment的来源,你会看到

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    RoboGuice.getInjector(getActivity()).injectViewMembers(this);
}

如果您坚持手动注射,请使用injectViewMembers().如果您可以延迟触摸视图onViewCreated(),那么它将为您设置.