我有 3 个片段页面应用程序，在第一个和第三个片段中我有列表视图，在第二个片段中只有一个 textview(infoz)。代码工作正常，但我无法在第二个片段中将 json 字符串添加到 textview 我尝试了几种方法但我没有成功。TextView infoz = (TextView) getView().findViewById(R.id.infoz); 这是我想用数组中的字符串填充的文本视图，我该怎么做？
这是代码
public class Fragment2 extends Fragment {
private ArrayList<FeedItem> feedList;
private ArrayList<SecondFeedItem> secondfeedList;
private ListView feedListView;
private ListView secondfeedListView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.home, container, false);
String url = "";
new DownloadFilesTask().execute(url);
return rootView;
}
public void updateList() {
TextView infoz = (TextView) getView().findViewById(R.id.infoz);
feedListView= (ListView)getActivity().findViewById(R.id.custom_list);
secondfeedListView = (ListView)getActivity().findViewById(R.id.second_list);
feedListView.setAdapter(new CustomListAdapter(getActivity(), feedList));
feedListView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> a, View v, int position, long id) {
Object o = feedListView.getItemAtPosition(position);
FeedItem newsData = (FeedItem) o;
Intent intent = new Intent(getActivity(), FeedDetailsActivity.class);
intent.putExtra("feed", newsData);
startActivity(intent);
}
});
secondfeedListView.setAdapter(new secondCustomListAdapter (getActivity(), secondfeedList));
secondfeedListView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> a, View v, int position, long id) {
Object o = secondfeedListView.getItemAtPosition(position);
secondFeedItem secondData = (secondFeedItem) o;
Intent intent = new Intent(getActivity(), secondFeedDetailsActivity.class);
intent.putExtra("secondfeed", secondData);
startActivity(intent);
}
});
}
public class DownloadFilesTask extends AsyncTask<String, Integer, Void> {
@Override
protected void onProgressUpdate(Integer... values) {
}
@Override
protected void onPostExecute(Void result) {
if (null != feedList) {
updateList();
}
if (null != badfeedList) {
updateList();
}
}
@Override
protected Void doInBackground(String... params) {
String url = params[0];
// getting JSON string from URL
JSONObject json = getJSONFromUrl(url);
//parsing json data
parseJson(json);
return null;
}
}
public JSONObject getJSONFromUrl(String url) {
InputStream is = null;
JSONObject jObj = null;
String json = null;
// Making HTTP request
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
public void parseJson(JSONObject json) {
try {
// parsing json object
if (json.getString("status").equalsIgnoreCase("ok")) {
JSONArray posts = json.getJSONArray("posts");
String inffoz;
feedList = new ArrayList<FeedItem>();
for (int i = 0; i < posts.length(); i++) {
JSONObject post = (JSONObject) posts.getJSONObject(i);
FeedItem item = new FeedItem();
item.setTitle(post.getString("title"));
item.setDate(post.getString("description"));
item.setId(post.getString("id"));
item.setUrl(post.getString("url"));
item.setContent(post.getString("description"));
item.setsecondtitle(post.getString("description"));
JSONArray attachments = post.getJSONArray("attachments");
item.setsecondtitle(post.getString("secondtitle"));
if (null != attachments && attachments.length() > 0) {
JSONObject attachment = attachments.getJSONObject(0);
if (attachment != null)
item.setAttachmentUrl(attachment.getString("url"));
}
feedList.add(item);
}
}
if (json.getString("status").equalsIgnoreCase("ok")) {
JSONArray posts = json.getJSONArray("posts");
secondfeedList = new ArrayList<secondFeedItem>();
for (int i = 0; i < posts.length(); i++) {
JSONObject post = (JSONObject) posts.getJSONObject(i);
secondFeedItem item = new secondFeedItem();
item.setTitle(post.getString("title"));
item.setDate(post.getString("description"));
item.setId(post.getString("id"));
item.setUrl(post.getString("url"));
item.setContent(post.getString("description"));
JSONArray attachments = post.getJSONArray("attachments");
if (null != attachments && attachments.length() > 0) {
JSONObject attachment = attachments.getJSONObject(0);
if (attachment != null)
item.setAttachmentUrl(attachment.getString("url"));
}
secondfeedList.add(item);
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
json
{
"status": "ok",
"count": 10,
"posts": [
{
"id": 2398,
"type": "post",
"slug": "",
"url": "",
"status": "publish",
"title": "bla",
"description": "bla",
"date": "2013-06-11 ",
"content": "dadadadaddaadad",
"secondbadtitle": "blaaaaaaa",
"attachments": [
{
"id": 2342,
"url": "",
"slug": "",
"title": "",
"description": "",
"content": "dadadadaddaadad",
"caption": "ssss",
"parent": 2398,
"mime_type": "image/jpg",
"images": []
}
],
"comment_count": 3
}
}