我正在尝试从网络服务器检索数据并在List Android中显示，似乎我正在接收数据，但它从未出现在列表中，我与适配器混淆，我不知道它是否真的在做我想做的事情，虽然我从JSON数据中收到某种类型的错误，它说类型不匹配，可能是这个原因？
以下是我称之为适配器的文件
public class MyKinstFragment extends Fragment {
private ListView listView ;
private Button newsButton, documentsButton;
private SimpleAdapter adpt;
//ArrayList<String> listItems= new ArrayList<String>();
/*private static String[] MOBILE_MODELS = {"iPhone 6","Nexus 6","Moto G","HTC One","Galaxy S5","Sony Xperia Z2","Lumia 830","Galaxy Grand 2"};*/
private static String[] MOBILE_MODELS = {"cachampo","champs","champi","champu","Galaxy S5","Sony Xperia Z2","Lumia 830","Galaxy Grand 2"};
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.mykinst_layout, container, false);
initWidgets(rootView);
return rootView;
}
public void initWidgets(View rootView){
adpt = new SimpleAdapter(new ArrayList<News>(), rootView.getContext());
listView = (ListView) rootView.findViewById(R.id.listView);
listView.setAdapter(adpt);
listView.setClickable(true);
newsButton = (Button) rootView.findViewById(R.id.newsButton);
newsButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
newsButton.setBackgroundColor(Color.RED);
documentsButton.setBackgroundColor(Color.BLUE);
(new AsyncListViewLoader()).execute("http://kinst.gizmomen.com/api/v1/feeds/");
}
});
}
//GET news from webserver
private class AsyncListViewLoader extends AsyncTask<String, Void, List<News>> {
private final ProgressDialog dialog = new ProgressDialog(getActivity());
@Override
protected void onPostExecute(List<News> result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
dialog.dismiss();
adpt.setItemList(result);
adpt.notifyDataSetChanged();
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
dialog.setMessage("Getting Data");
dialog.show();
}
@Override
protected List<News> doInBackground(String... params) {
// TODO Auto-generated method stub
List<News> result = new ArrayList<News>();
try {
URL u = new URL(params[0]);
HttpURLConnection conn = (HttpURLConnection) u.openConnection();
conn.setRequestMethod("GET");
conn.connect();
InputStream is = conn.getInputStream();
//read
byte[] b = new byte[1024];
ByteArrayOutputStream baos = new ByteArrayOutputStream();
while (is.read(b) != -1)
baos.write(b);
String JSONResp = new String(baos.toByteArray());
JSONArray arr = new JSONArray(JSONResp);
for(int i=0; i < arr.length(); i++) {
result.add(convertNews(arr.getJSONObject(i)));
}
return result;
}
catch(Throwable t){
t.printStackTrace();
}
return null;
}
private News convertNews(JSONObject obj) throws JSONException {
String id = obj.getString("id");
String title = obj.getString("title");
String message = obj.getString("message");
String imageUrl = obj.getString("image_url");
String location = obj.getString("location");
return new News(id, title, message, imageUrl, location);
}
}
}
这是我为对象“新闻”定制的适配器
public class SimpleAdapter extends ArrayAdapter<News> {
private List<News> newsList;
private Context context;
public SimpleAdapter(List<News> newsList, Context ctx) {
super(ctx, android.R.layout.simple_list_item_1, newsList);
this.newsList = newsList;
this.context = ctx;
// TODO Auto-generated constructor stub
}
public int getCount() {
if(newsList != null)
return newsList.size();
return 0;
}
public News getItem(int position) {
if (newsList != null)
return newsList.get(position);
return null;
}
public long getItemId(int position) {
if (newsList != null)
return newsList.get(position).hashCode();
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
View v = convertView;
if(v==null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = inflater.inflate(R.layout.list_item, null);
}
News n = newsList.get(position);
TextView tle = (TextView) v.findViewById(R.id.title);
tle.setText(n.getTitle());
TextView msg = (TextView) v.findViewById(R.id.message);
msg.setText(n.getMessage());
TextView loc = (TextView) v.findViewById(R.id.location);
loc.setText(n.getLocation());
TextView iUrl = (TextView) v.findViewById(R.id.imgurl);
iUrl.setText(n.getImgURL());
return v;
}
public List<News> getItemList() {
return newsList;
}
public void setItemList(List<News> itemList) {
this.newsList = itemList;
}
}
我得到的原木猫是这样的：
05-20 21：47：02.690：W / System.err（741）：org.json.JSONException：Value {“results”：[{“message”：“
just it＆lt; / p＆gt;“，”“id”：10，“title”：“new 4”，“location”：[87,89,90,91,92,94]，“image_url”：“feed_images / Screen_Shot_2015-05-15_at_4 .13.47_pm_Rv9LCka.png“}，{”message“：”
任何内容＆lt; / p＆gt;
第二行＆lt; / p＆gt;
结束＆lt; / p＆gt;“，”“id”：9，“title”：“第三个”，“位置”：[87,89,90,91,92,94]，“image_url”：“feed_images / Screen_Shot_2015-04-28_at_4 .40.20_pm.png“}，{”message“：”
带图像＆lt; / p＆gt;“，”id“：8，”title“：”另一个“，”位置“：[ 87,89,90,91,92,94]，“image_url”：“feed_images / Screen_Shot_2015-04-28_at_4.35.51_pm.png”}，{“message”：“
new with image＆lt; / p＆gt;
好吗？＆lt; / p＆gt;“，”id“：7，”title“：”with image“，”location“：[87,89,90,91,92,94 ]，“image_url”：“feed_images / Screen_Shot_2015-05-15_at_4.13.47_pm.png”}，“previous”：null，“count”：4，类型为org.json.JSONObject的“next”：null}不能转换为JSONArray 05-20 21：47：02.690：W / System.err（741）：at org.json.JSON.typeMismatch（JSON.java:111） 05-20 21：47：02.690：W / System.err（741）：at org.json.JSONArray。（JSONArray.java:91） 05-20 21：47：02.730：W / System.err（741）：at org.json.JSONArray。（JSONArray.java:103） 05-20 21：47：02.760：W / System.err（741）：at com.javacodegeeks.android.tablayout_with_fragments.MyKinstFragment $ AsyncListViewLoader.doInBackground（MyKinstFragment.java:139） 05-20 21：47：02.760：W / System.err（741）：at com.javacodegeeks.android.tablayout_with_fragments.MyKinstFragment $ AsyncListViewLoader.doInBackground（MyKinstFragment.java:1） 05-20 21：47：02.830：W / System.err（741）：在android.os.AsyncTask $ 2.call（AsyncTask.java:287） 05-20 21：47：02.830：W / System.err（741）：at java.util.concurrent.FutureTask $ Sync.innerRun（FutureTask.java:305） 05-20 21：47：02.830：W / System.err（741）：at java.util.concurrent.FutureTask.run（FutureTask.java:137） 05-20 21：47：02.830：W / System.err（741）：在android.os.AsyncTask $ SerialExecutor $ 1.run（AsyncTask.java:230） 05-20 21：47：02.830：W / System.err（741）：at java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1076） 05-20 21：47：02.830：W / System.err（741）：at java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:569） 05-20 21：47：02.878：W / System.err（741）：at java.lang.Thread.run（Thread.java:856）
但是我不认为JSON数据是问题，请帮助我永远欣赏它