我正在进行Flickr集成并使用Json解析..我能够获取数据但是它没有显示，因为适配器的getView（）方法没有被调用。但是，我使用Toast消息检查了适配器类的构造函数..我不知道为什么getView（）没有被调用...我已经检查了几乎类似的问题的其他问题，但无法找到解决我的问题的解决方案
public class FlickrImagesList extends Fragment
{
private FragmentActivity myContext;
ArrayList<Flickr> flickrList;
private static final String photo = "photo";
private static final String id = "id";
private static final String owner = "owner";
private static final String secret = "secret";
private static final String server = "server";
private static final String farm = "farm";
private static final String title = "title";
private static final String ispublic = "ispublic";
private static final String isfriend = "isfriendt";
private static final String isfamily = "isfamily";
ImageLoader imageLoader;
FlickrListAdapter adapter;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
View rootView = inflater.inflate(R.layout.flickr_main_list, container, false);
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
// imageLoader = ImageLoader.getInstance();
// imageLoader.init(ImageLoaderConfiguration.createDefault(myContext));
rootView.setFocusableInTouchMode(true);
flickrList= new ArrayList<Flickr>();
new JSONAsyncTask().execute("https://api.flickr.com/services/rest?method=flickr.groups.pools.getPhotos&api_key=xyz&format=json&group_id=2058557@N24&nojsoncallback=1");
ListView listview = (ListView)rootView.findViewById(R.id.listflickr);
adapter = new FlickrListAdapter(getActivity().getApplicationContext(), R.layout.flickr_list_single,flickrList);
listview.setAdapter(adapter);
return rootView;
}
class JSONAsyncTask extends AsyncTask<String, Void, Boolean> {
ProgressDialog dialog;
@Override
protected void onPreExecute()
{
super.onPreExecute();
dialog = new ProgressDialog(getActivity());
dialog.setMessage("Loading, please wait");
dialog.setTitle("Connecting server");
dialog.show();
dialog.setCancelable(false);
}
@Override
protected Boolean doInBackground(String... urls)
{
try
{
HttpGet httppost = new HttpGet(urls[0]);
HttpClient httpclient = new DefaultHttpClient();
HttpResponse response = httpclient.execute(httppost);
int status = response.getStatusLine().getStatusCode();
Log.e("status","status");
if (status == 200) {
Log.e("status2","status2");
HttpEntity entity = response.getEntity();
String data = EntityUtils.toString(entity);
entity.consumeContent();
JSONObject jsono = new JSONObject(data);
JSONArray jarray = jsono.getJSONArray("photos");
for (int i = 0; i < jarray.length(); i++)
{
Log.e("status3","status3");
JSONObject c = jarray.getJSONObject(i);
JSONObject ph = c.getJSONObject(photo);
Flickr actor = new Flickr();
if(ph.has(id)) {
actor.setId(ph.getString(id));
}
if(ph.has(owner)) {
actor.setOwner(ph.getString(owner));
}
if(ph.has(secret))
{
actor.setSecret(ph.getString(secret));
}
if(ph.has(server)) {
actor.setServer(ph.getString(server));
}
if(ph.has(farm)) {
actor.setFarm(ph.getString(farm));
}
if(ph.has(title)) {
actor.setTitle(ph.getString(title));
}
if(ph.has(ispublic)) {
actor.setIspublic(ph.getString(ispublic));
}
if(ph.has(isfriend)) {
actor.setIsfriend(ph.getString(isfriend));
}
if(ph.has(isfamily)) {
actor.setIsfamily(ph.getString(isfamily));
}
Log.e("actor.getServer()", actor.getServer());
flickrList.add(actor);
}
return true;
}
//------------------>>
}
catch (ParseException e1)
{
e1.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
catch (JSONException e)
{
Log.e("exception", e.getMessage());
e.printStackTrace();
}
return false;
}
protected void onPostExecute(Boolean result)
{
dialog.cancel();
adapter.notifyDataSetChanged();
}
}
}
FlickrListAdapter
public class FlickrListAdapter extends ArrayAdapter<Flickr> {
ArrayList<Flickr> flickrList;
LayoutInflater vi;
int Resource;
ViewHolder holder;
DisplayImageOptions options;
public FlickrListAdapter(Context context, int resource, ArrayList<Flickr> objects)
{
super(context, resource, objects);
Toast.makeText(context,"FlickrListAdapter",Toast.LENGTH_LONG).show();
vi = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
Resource = resource;
flickrList = objects;
options = new DisplayImageOptions.Builder()
.showImageOnLoading(android.R.color.transparent)
.showImageForEmptyUri(android.R.color.transparent)
.showImageOnFail(android.R.color.transparent)
.cacheInMemory(true)
.cacheOnDisk(true)
.considerExifParams(true)
.bitmapConfig(Bitmap.Config.RGB_565)
.build();
}
@Override
public View getView(int position, View convertView, ViewGroup parent)
{ Toast.makeText(getContext(),"getView",Toast.LENGTH_LONG).show();
// convert view = design
View v = convertView;
if (v == null)
{
holder = new ViewHolder();
v = vi.inflate(Resource, null);
holder.imageview = (ImageView) v.findViewById(R.id.flickr_image);
v.setTag(holder);
}
else
{
holder = (ViewHolder) v.getTag();
}
holder.imageview.setImageResource(R.drawable.logo_icon);
ImageLoader.getInstance().displayImage("https://farm" + flickrList.get(position).getFarm() + ".staticflickr.com/" + flickrList.get(position).getServer() + "/"
+ flickrList.get(position).getId() + "_" + flickrList.get(position).getSecret() + ".jpg",holder.imageview, options);
}
static class ViewHolder
{
public ImageView imageview;
public TextView textview;
public TextView textview2;
}
}
如果我添加
@Override
public int getCount () {
return 1;
}
然后app崩溃显示ImageLoader上的错误
java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
答案 0 :(得分：1)
您的适配器getView()未被调用，因为您从flickrList获取的列表JSONAsyncTask()为空。
实际上你得到了这个例外：
java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
根据你的.json回复 的 http://www.mocky.io/v2/548b349c9739deb61372aecf
问题是你的解析器，这将解决你的问题：
JSONObject jsono = new JSONObject(data);
JSONObject jb = jsono.getJSONObject("photos");
JSONArray jarray = jb.getJSONArray("photo");
for (int i = 0; i < jarray.length(); i++){
Log.e("status3","status3");
JSONObject ph = jarray.getJSONObject(i);
Flickr actor = new Flickr();
答案 1 :(得分：0)
我正在创建JSONObject的问题就是为什么列表的大小为零，因为jarray为零..我通过更改为...来解决它。
JSONObject jsono = new JSONObject(data);
JSONObject c = jsono.getJSONObject(photos);
JSONArray jarray = c.getJSONArray(photo);
for (int i = 0; i < jarray.length(); i++){
Log.e("status3","status3");
JSONObject ph = jarray.getJSONObject(i);
Flickr actor = new Flickr();