Static Vs动态imageview创建

Question

从片段动态创建imageview时遇到问题。这是代码：

public class Fragment_Categorize extends Fragment implements View.OnDragListener, View.OnLongClickListener {
Context context;

public Fragment_Categorize() {
    // Required empty public constructor
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragment__categorize, container, false);

}

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    context = getActivity().getApplicationContext();

    ImageView imm = new ImageView(context);
    imm.setBackgroundResource(R.drawable.apple);

    ImageView black = (ImageView) getActivity().findViewById(R.id.black);
    black.setOnLongClickListener(this);

动态创建的imageview在getId（）上返回-1，其中静态工作正常。有什么理由吗？

Answer 1

因为您没有为dinamical ID设置ID，所以您只需设置背景。

选中此答案以动态设置ID：link