7
मेरे पास एक सर्वर से पार्स किए गए बाहरी JSON डेटा प्राप्त करने वाला एक RecyclerView है। यह ठीक काम करता है हालांकि JSON पर वॉली एसिंक कार्य में कुछ समय लगता है और जब यह खंड खाली खाली दृश्य प्रदर्शित करता है।रीसाइक्लर व्यू खाली होने पर कैसे पता लगाया जाए?
यह देखने के लिए कि मैं दृश्य खाली है या नहीं, एक संदेश कैसे प्रदर्शित कर सकता हूं? मैं जाँच करने की कोशिश की:
if (recyclerView == null)
if (jsonList == null)
if (adapter.getItemCount() == 0)
if (bundle == null)
लेकिन उन परीक्षणों या तो न कुछ भी करने या वे त्रुटि संदेश हर बार भले ही RecyclerView खाली नहीं है प्रदर्शित करते हैं।
public void onViewCreated(View view, Bundle savedInstanceState) {
LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
layoutManager.supportsPredictiveItemAnimations();
recyclerView.setLayoutManager(layoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setClickable(true);
recyclerView.setHasFixedSize(true);
recyclerView.addItemDecoration(new DividerItemDecoration(getActivity(), DividerItemDecoration.VERTICAL_LIST));
NovaAdapter novaAdapter = new NovaAdapter(getActivity(),jsonList);
if (novaAdapter.getItemCount() != 0) {
recyclerView.setAdapter(novaAdapter);
}else{
pDialog = new ProgressDialog(getActivity());
pDialog.setMessage("Retrieving data from Server");
pDialog.show();
}
super.onViewCreated(view, savedInstanceState);
और एडाप्टर पर विधि:
@Override
public int getItemCount() {
return (null != novaList ? novaList.size() : 0);
}
जिस तरह से यह अब है प्रगति हमेशा संवाद कोई बात नहीं चलाते हैं दृश्य खाली है
यह टुकड़ा पर कोड है या नहीं।
अद्यतन:
public class NovaAdapter extends RecyclerView.Adapter<NovaListRowHolder> {
ArrayList<HashMap<String, String>> novaList = new ArrayList<HashMap<String, String>>();
public static final String STATUS = "status";
public static final String NAME = "name";
public static final String ID = "id";
private Context mContext;
public NovaAdapter(Context context, ArrayList<HashMap<String, String>> novaList) {
this.novaList = novaList;
this.mContext = context;
}
@Override
public NovaListRowHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.instances_list, null);
NovaListRowHolder mh = new NovaListRowHolder(v);
return mh;
}
@Override
public void onBindViewHolder(NovaListRowHolder novaListRowHolder, int i) {
HashMap<String, String> e = novaList.get(i);
novaListRowHolder.name.setText(e.get(NAME));
novaListRowHolder.status.setText(e.get(STATUS));
novaListRowHolder.setId(e.get(ID));
}
@Override
public int getItemCount() {
return (null != novaList ? novaList.size() : 0);
}class NovaListRowHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
protected TextView name;
protected TextView status;
protected String id;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public NovaListRowHolder(View view) {
super(view);
view.setOnClickListener(this);
this.name = (TextView) view.findViewById(R.id.nameInstance);
this.status = (TextView) view.findViewById(R.id.statusInstance);
}
public void onClick(View view){
Dialog dialog = new Dialog(view.getContext());
dialog.setContentView(R.layout.instances_listdetail);
dialog.setTitle("Details " + name.getText() + " " + getPosition());
dialog.show();
}
UPDATE2::
मैं एक वर्ग है जो काफी अब एक कॉलबैक इंटरफ़ेस तथापि 1 सेकंड के लिए recyclerView प्रदर्शित करता है के साथ ऊपर से एक के रूप में ही है अद्यतन यहाँ एडाप्टर कोड है और फिर खाली हो जाता है। संवाद भी नहीं दिखाता है। कोड यह रहा:
public class SubnetsFragment extends Fragment implements OnJSONLoaded{
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
private OnFragmentInteractionListener mListener;
public ArrayList<HashMap<String, String>> jsonList;
public RecyclerView recyclerView;
public ProgressDialog pDialog;
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static SubnetsFragment newInstance(int sectionNumber) {
SubnetsFragment fragment = new SubnetsFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public SubnetsFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Bundle extras = getArguments();
Serializable parsedList = extras.getSerializable("SubnetsParsed");
jsonList = (ArrayList<HashMap<String, String>>)parsedList;
if (extras == null){
AlertDialog.Builder alert = new AlertDialog.Builder(getActivity());
alert.setTitle("Token Expired");
alert.setMessage("Authentication Token expired! Please login again.")
.setNeutralButton("Connect", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
Intent intent = new Intent(getActivity(), Login.class);
startActivity(intent);
getActivity().finish();
getFragmentManager().beginTransaction().remove(SubnetsFragment.this).commit();
}
});
AlertDialog alertDialog = alert.create();
alertDialog.show();
}
View rootView = inflater.inflate(R.layout.fragment_subnets, container, false);
recyclerView = (RecyclerView)rootView.findViewById(R.id.subnetsRV);
return rootView;
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
layoutManager.supportsPredictiveItemAnimations();
recyclerView.setLayoutManager(layoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setClickable(true);
recyclerView.setHasFixedSize(true);
recyclerView.addItemDecoration(new DividerItemDecoration(getActivity(), DividerItemDecoration.VERTICAL_LIST));
onJsonLoaded(jsonList);
}
@Override
public void onJsonLoaded(ArrayList<HashMap<String, String>> list) {
SubnetsParser.setOnJSONLoadedListener(new OnJSONLoaded() {
@Override
public void onJsonLoaded(ArrayList<HashMap<String, String>> list) {
if (list.size() != 0){
SubnetsAdapter subnetsAdapter = new SubnetsAdapter(getActivity(),jsonList);
recyclerView.setAdapter(subnetsAdapter);
}else {
pDialog = new ProgressDialog(getActivity());
pDialog.setMessage("Retrieving data from Server");
pDialog.show();
}
}
});
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
((Stackerz) activity).onSectionAttached(
getArguments().getInt(ARG_SECTION_NUMBER));
//try {
// mListener = (OnFragmentInteractionListener) activity;
//} catch (ClassCastException e) {
// throw new ClassCastException(activity.toString()
// + " must implement OnFragmentInteractionListener");
//}
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
public void onFragmentInteraction(Uri uri);
}
}
और यह JSON पार्सर वर्ग है:
public class SubnetsParser extends Activity{
public static final String NAME = "name";
public static final String GW = "gw";
public static final String CIDR = "cidr";
public static final String ID = "id";
public String authToken;
public String neutronURL;
public static SubnetsParser parser = null;
public static OnJSONLoaded mListener;
public static void setOnJSONLoadedListener(OnJSONLoaded listener) {
mListener = listener;
}
public interface OnJSONLoaded {
void onJsonLoaded(ArrayList<HashMap<String, String>> list);
}
public static SubnetsParser shared(){
if (parser == null){
parser = new SubnetsParser();
}
return parser ;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
public static ArrayList<HashMap<String, String>> parseJSON(String subnetsJSON){
ArrayList<HashMap<String, String>> jsonList = new ArrayList<HashMap<String, String>>();
try {
Subnets subnets = new Subnets();
JSONObject subnet = new JSONObject(subnetsJSON);
JSONArray subnetobj = subnet.getJSONArray("subnets");
for (int i = 0; i < subnetobj.length(); i++) {
JSONObject objsrv = subnetobj.getJSONObject(i);
subnets.setName(objsrv.getString("name"));
subnets.setGw(objsrv.getString("gateway_ip"));
subnets.setCidr(objsrv.getString("cidr"));
subnets.setId(objsrv.getString("id"));
HashMap<String, String> map = new HashMap<String, String>();
map.put(NAME, subnets.getName());
map.put(GW, subnets.getGw());
map.put(CIDR, subnets.getCidr());
map.put(ID, subnets.getId());
jsonList.add(map);
}
} catch (JSONException e) {
Log.d("ErrorInitJSON", e.toString());
e.printStackTrace();
}
Collections.sort(jsonList, new Comparator<HashMap<String, String>>() {
@Override
public int compare(HashMap<String, String> lhs, HashMap<String, String> rhs) {
return (lhs.get("name")).compareToIgnoreCase(rhs.get("name"));
}
});
if (mListener != null) {
mListener.onJsonLoaded(jsonList);
}
return jsonList;
}
}
क्यों एक प्रगति बार नहीं दिखाते ?? Asynctask के साथ एक बहुत ही आम उपयोग है। – Mike
मैं वॉली के साथ प्रोग्रेसबार का उपयोग कैसे कर सकता हूं? जिस तरीके से मेरा ऐप कॉन्फ़िगर किया गया है, वह बैकग्राउंड क्लास में उपयोग किया जाता है जिसे एक खंड – GITcommitEd
रीसाइक्लर व्यू वास्तव में एक 'व्यू ग्रुप' कहा जाता है, क्या आपने कभी "RecyclerView.getChildCount() == 0" कोशिश की है? – VinceStyling