android - 为什么 FindViewById 不出来？如果我自己写它会变红

Question

为什么 FindViewById 不起作用？如果我输入 findView ...，findViewById 不会出现，如果我自己输入，它会写错误。我的代码（片段）：

public class BiografiyaFragment extends Fragment {

    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";
    private String mParam1;
    private String mParam2;

    public BiografiyaFragment() {
    }

    public static BiografiyaFragment newInstance(String param1, String param2) {
        BiografiyaFragment fragment = new BiografiyaFragment();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_biografiya, container, false);
}
}

截屏

标签： androidfindviewbyid

Answer 1

这是一个片段。因此，您必须View在onCreateView方法中创建类的对象。所以，里面的代码onCreateView是，

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view=inflater.inflate(R.layout.fragment_biografiya, container, false);
        // I am assuming a textview here....
        TextView textView=view.findViewById(R.id.textView);
        return view;
}