Question

我有一个ListView我在显示从JSON格式的网址中获取的ArrayList中的项目。每个项目由5个元素组成。我想在单击另一个活动时传递与该特定列表项关联的元素。但是当我将ArrayList传递给另一个活动并迭代ArrayList时，无论我点击哪个列表项，列表中的最后一项都会打开。

这是我的代码：

MainActivity.java

JSONArray jObject = new JSONArray(responseBody);
for (int i = 0; i < jObject.length(); i++) {
  JSONObject menuObject = jObject.getJSONObject(i);
  String title= menuObject.getString("Title");
  String description= menuObject.getString("BodyText");
  String thumbnail= menuObject.getString("ThumbnailPath");
  String nUrl = menuObject.getString("Url");
  String body = menuObject.getString("Body");
  String nBigImage = menuObject.getString("ImageBlobUrls");

  map = new HashMap<String,String>();
  map.put(SOURCETITLE, title);
  map.put(TITLE, description);
  map.put(THUMBNAILPATH, thumbnail);
  map.put(BODY, body);
  map.put(URL, nUrl);
  map.put(IMAGEBLOBURLS,nBigImage);

  myList.add(map);
}

myListView.setAdapter(itemsAdapter);
myListView.setOnItemClickListener(new OnItemClickListener() {

    @Override
    public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) 
    {
        // TODO Auto-generated method stub
        Intent nIntent = new Intent(Home.this,NDetails.class);
        nIntent.putExtra("myItems", myList);
        startActivity(nIntent);
    }
});

NDetails.java

Intent in = getIntent();

    data =  (ArrayList<HashMap<String, String>>) in.getSerializableExtra("myItems");

    for(Map<String, String> newItem:data)
    {
         newUrl = newItem.get(Home.URL);
         newTitle =newItem.get(Home.SOURCETITLE);
         newBody= newItem.get(Home.BODY);
         newImage = newItem.get(Home.THUMBNAILPATH);

    }


     txtNewsTitle.setText(newTitle);
     txtNewsBody.setText(newBody);

我该如何解决这个问题？感谢

Answer 1

试试这个：

myListView.setOnItemClickListener(new OnItemClickListener() 
                        {

                            @Override
                            public void onItemClick(AdapterView<?> arg0,
                                    View arg1, int position, long arg3) 
                            {
                                // TODO Auto-generated method stub

                                HashMap myMap = myList.get(position);
                                Intent nIntent = new Intent(Home.this,NDetails.class);
                                newsIntent.putExtra("myItems", myMap);
                                startActivity(nIntent);
                            }
                        });

并在另一个活动中获取地图：

data =  (HashMap<String, String>>) in.getSerializableExtra("myItems");

newUrl = data.get(Home.URL);
     data =newItem.get(Home.SOURCETITLE);
     data= newItem.get(Home.BODY);
     data = newItem.get(Home.THUMBNAILPATH);

Answer 2

myListView.setOnItemClickListener(new OnItemClickListener() {

@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) {
    HashMap<String, String> item = ( HashMap<String, String>)arg0.getItemAtPosition(position);
    Intent nIntent = new Intent(Home.this,NDetails.class);
    newsIntent.putExtra("myItems", myList);
    startActivity(nIntent);
}
 });

您可以使用AdapterView.getItemAtPosition(int)检索位置

的元素

使HashMap与ListView中的特定项相关联

2 个答案: