SimpleAdapter 的问题

Question

我想做文件管理器。该算法与 ArrayAdapter 配合使用效果很好，但是当我在 SimpleAdapter 下重新编写它时，它停止正常工作。主要问题：当我将元素添加到 ArrayList 时，它被复制了。我不知道出了什么问题。帮我。塔克斯

onActivityCreated 方法：

private final String ATTRIBUTE_NAME_TEXT = "text";
private final String ATTRIBUTE_NAME_IMAGE = "image";

private String[] from = {ATTRIBUTE_NAME_TEXT, ATTRIBUTE_NAME_IMAGE};
private int[] to = {R.id.currPath, R.id.imageView};


@Override
public void onActivityCreated(Bundle savedInstanceState){
    super.onActivityCreated(savedInstanceState);

    Log.d(TAG, "Tab created");
    if (savedInstanceState == null) {
        Log.d(TAG, "SIS == null");
        paths.add("/storage/emulated/0/");
        paths.add("/storage/extSdCard/");

        Map<String, Object> m = new HashMap<>();
        ArrayList<Map<String, Object>> data = new ArrayList<>();
        for(int i = 0; i < paths.size(); i++){
            m.put("text", paths.get(i));
            m.put(ATTRIBUTE_NAME_IMAGE, R.mipmap.ic_launcher);
            data.add(m);
        }
        MySimpleAdapter adapter = new MySimpleAdapter(getActivity(), data, R.layout.item, from, to);
        setListAdapter(adapter);//Creating a primary form of application
    }
    else{
        Log.d(TAG, "SIS != null");
        currentPath = savedInstanceState.get(KEY_PATH).toString();
        paths = savedInstanceState.getStringArrayList(KEY_LIST);

        Map<String, Object> m = new HashMap<>();
        ArrayList<Map<String, Object>> data = new ArrayList<>();
        for(int i = 0; i < paths.size(); i++){
            m.put(ATTRIBUTE_NAME_TEXT, paths.get(i));
            m.put(ATTRIBUTE_NAME_IMAGE, R.mipmap.ic_launcher);
            data.add(m);
        }
        MySimpleAdapter adapter = new MySimpleAdapter(getActivity(), data, R.layout.item, from, to);
        setListAdapter(adapter);
    }
}

Answer 1

为了解决这个问题，正如 Mike 在评论中提到的，您需要为循环的每次迭代创建一个新的 Map 实例。

for(int i = 0; i < paths.size(); i++){
    Map<String, Object> m = new HashMap<>();
    m.put(ATTRIBUTE_NAME_TEXT, paths.get(i));
    m.put(ATTRIBUTE_NAME_IMAGE, R.mipmap.ic_launcher);
    data.add(m);
}

SimpleAdapter 的问题

Trouble with SimpleAdapter

android

arraylist

hashmap

simpleadapter