Question

我有一个带有视图寻呼机的活动，其中包含5个片段。在每个片段的布局中，我需要一个可扩展的列表视图。当在每个片段中使用普通列表视图时，应用程序运行正常，但是当使用可扩展列表视图时，应用程序崩溃。如何在片段内使用可扩展列表视图？

Answer 1

你能提供你的崩溃日志吗？没有记录，没有解决方案...

以下代码不会崩溃。 Fragment内的Activity，fragment的根视图为ExpandableListView。也许它可以帮助你。

private Map<String, List<String>> dataset = new HashMap<>();
private String[] parentList = new String[]{"first", "second", "third"};
private List<String> childrenList1 = new ArrayList<>();
private List<String> childrenList2 = new ArrayList<>();
private List<String> childrenList3 = new ArrayList<>();

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

private void initialData() {
    childrenList1.add(parentList[0] + "-" + "first");
    childrenList1.add(parentList[0] + "-" + "second");
    childrenList1.add(parentList[0] + "-" + "third");
    childrenList2.add(parentList[1] + "-" + "first");
    childrenList2.add(parentList[1] + "-" + "second");
    childrenList2.add(parentList[1] + "-" + "third");
    childrenList3.add(parentList[2] + "-" + "first");
    childrenList3.add(parentList[2] + "-" + "second");
    childrenList3.add(parentList[2] + "-" + "third");
    dataset.put(parentList[0], childrenList1);
    dataset.put(parentList[1], childrenList2);
    dataset.put(parentList[2], childrenList3);
}

@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    initialData();
    ExpandableListView expandableListView = (ExpandableListView) view;
    expandableListView.setAdapter(new MyAdapter());
}

class MyAdapter extends BaseExpandableListAdapter {


    @Override
    public int getGroupCount() {
        return dataset.size();
    }

    @Override
    public int getChildrenCount(int i) {
        return dataset.get(parentList[i]).size();
    }

    @Override
    public Object getGroup(int i) {
        return dataset.get(parentList[i]);
    }

    @Override
    public Object getChild(int i, int i1) {
        return dataset.get(parentList[i]).get(i1);
    }

    @Override
    public long getGroupId(int i) {
        return i;
    }

    @Override
    public long getChildId(int i, int i1) {
        return i1;
    }

    @Override
    public boolean hasStableIds() {
        return false;
    }

    @Override
    public View getGroupView(int i, boolean b, View view, ViewGroup viewGroup) {
        if (view == null) {
            view = View.inflate(getActivity(), R.layout.parent_item, null);
        }
        view.setTag(R.layout.parent_item, i);
        view.setTag(R.layout.child_item, -1);
        TextView text = (TextView) view.findViewById(R.id.parent_title);
        text.setText(parentList[i]);
        return view;
    }

    @Override
    public View getChildView(int i, int i1, boolean b, View view, ViewGroup viewGroup) {
        if (view == null) {
            view = View.inflate(getActivity(), R.layout.child_item, null);
        }
        view.setTag(R.layout.parent_item, i);
        view.setTag(R.layout.child_item, i1);
        TextView text = view.findViewById(R.id.child_title);
        text.setText(dataset.get(parentList[i]).get(i1));
        text.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(getActivity(), "点到了内置的textview", Toast.LENGTH_SHORT).show();
            }
        });
        return view;
    }

    @Override
    public boolean isChildSelectable(int i, int i1) {
        return false;
    }
}

片段内的可扩展ListView

1 个答案: