I'm implementing an endless data loading for a RecyclerView. When software detects that last item is going to be shown, it downloads new items and call to the loadMoreData() function but new dataset is not showing.
When I called notifyDataSetChanged() so nothing to be happened.
I have only one solution that is refresh the view is to set again the adapter but problem is that the recyclerview returns to the first position then again recyclerview scrolled up from the first position to last position.
RecyclerViewActivity.java
RecyclerView rv;
DatabaseHelpr databaseHelpr;
RVAdapter adapter;
LocationFinder locationfinder;
Location currentLocation;
ArrayList<ServiceModel> childList, list;
private int MainService_ID, city_id;
String url2;
ActionBar actionBar;
JSONArray items = null;
Utility utility;
Double lat, longi;
LinearLayoutManager llm;
int counter=0;
ProgressBar progressBar;
private static final String TAG_ITEMS = "items";
private static final String TAG_LOCALITY = "Locality";
private static final String TAG_BUSINESS_ID = "Business_Id";
private static final String TAG_LONGITUDE = "Longitude";
private static final String TAG_BUSINESS_NAME = "Business_Name";
private static final String TAG_LATITUDE = "Latitude";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.recyclerview_activity);
list = new ArrayList<>();
utility = new Utility(this);
llm = new LinearLayoutManager(this);
Bundle bundle=getIntent().getExtras();
MainService_ID=bundle.getInt("service_id");
String mainService_Name = bundle.getString("service_name");
city_id = bundle.getInt("city_id");
lat= bundle.getDouble("lat");
longi=bundle.getDouble("longi");
rv=(RecyclerView)findViewById(R.id.rv);
rv.setLayoutManager(llm);
actionBar = getSupportActionBar();
assert actionBar != null;
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setTitle(mainService_Name);
//Here city_id = 8, lat = 18.552954, longi = 73.897200, counter=0, MainService_ID = 5
String url="https://servicedata2-dot-indiacomapi.appspot.com/_ah/api/servicedata/v1/ServiceData?city_id=";
url2 =url+city_id+"&lat="+lat+"&lng="+longi+"&roll="+counter+"&service_id="+MainService_ID;
AsyncHttpClient client = new AsyncHttpClient();
progressBar=(ProgressBar) findViewById(R.id.progressBar1);
progressBar.setVisibility(View.VISIBLE);
client.get(url2, new AsyncHttpResponseHandler() {
#Override
public void onSuccess(int statusCode, Header[] headers, byte[] response) {
// called when response HTTP status is "200 OK"
String s = new String(response);
try {
JSONObject jsonObj = new JSONObject(s);
// Getting JSON Array node
items = jsonObj.getJSONArray(TAG_ITEMS);
// looping through All Contacts
for (int i = 0; i < items.length(); i++) {
JSONObject c = items.getJSONObject(i);
String locality = c.getString(TAG_LOCALITY);
String business_Id = c.getString(TAG_BUSINESS_ID);
String longitude = c.getString(TAG_LONGITUDE);
String latitude = c.getString(TAG_LATITUDE);
String business_Name = c.getString(TAG_BUSINESS_NAME);
locationfinder = new LocationFinder(RecyclerViewActivity.this);
// check if GPS enabled
if (locationfinder.canGetLocation()) {
double lat = locationfinder.getLatitude();
double longi = locationfinder.getLongitude();
currentLocation = new Location("");
currentLocation.setLatitude(lat);
currentLocation.setLongitude(longi);
} else {
locationfinder.showSettingsAlert();
}
Location savedLocation = new Location("databaseLocation");
savedLocation.setLatitude(Double.parseDouble(latitude));
savedLocation.setLongitude(Double.parseDouble(longitude));
Double difference = currentLocation.distanceTo(savedLocation) * (0.001);
difference = Double.parseDouble(new DecimalFormat("##.##").format(difference));
String newDifference = String.valueOf(difference) + " km";
ServiceModel serviceModel = new ServiceModel(business_Id, business_Name, newDifference, locality);
list.add(serviceModel);
}
} catch (JSONException e) {
e.printStackTrace();
}
progressBar.setVisibility(View.GONE);
adapter = new RVAdapter(RecyclerViewActivity.this, list);
rv.setAdapter(adapter);
rv.addOnScrollListener(new EndlessRecyclerOnScrollListener(llm) {
#Override
public void onLoadMore(int current_page) {
// counter= counter+1;
loadMoreData();
}
});
}
#Override
public void onFailure(int statusCode, Header[] headers, byte[] errorResponse, Throwable e) {
// called when response HTTP status is "4XX" (eg. 401, 403, 404)
//Toast.makeText(getApplicationContext(),""+statusCode,Toast.LENGTH_LONG).show();
}
});
}
private void loadMoreData() {
counter= counter+1;
//Here city_id = 8, lat = 18.552954, longi = 73.897200, counter=1, MainService_ID = 5
String url="https://servicedata2-dot-indiacomapi.appspot.com/_ah/api/servicedata/v1/ServiceData?city_id=";
url2 =url+city_id+"&lat="+lat+"&lng="+longi+"&roll="+counter+"&service_id="+MainService_ID;
AsyncHttpClient client = new AsyncHttpClient();
progressBar=(ProgressBar) findViewById(R.id.progressBar1);
progressBar.setVisibility(View.VISIBLE);
client.get(url2, new AsyncHttpResponseHandler() {
#Override
public void onSuccess(int statusCode, Header[] headers, byte[] response) {
// called when response HTTP status is "200 OK"
String s = new String(response);
try {
JSONObject jsonObj = new JSONObject(s);
// Getting JSON Array node
items = jsonObj.getJSONArray(TAG_ITEMS);
// looping through All Contacts
for (int i = 0; i < items.length(); i++) {
JSONObject c = items.getJSONObject(i);
String locality = c.getString(TAG_LOCALITY);
String business_Id = c.getString(TAG_BUSINESS_ID);
String longitude = c.getString(TAG_LONGITUDE);
String latitude = c.getString(TAG_LATITUDE);
String business_Name = c.getString(TAG_BUSINESS_NAME);
locationfinder = new LocationFinder(RecyclerViewActivity.this);
// check if GPS enabled
if (locationfinder.canGetLocation()) {
double lat = locationfinder.getLatitude();
double longi = locationfinder.getLongitude();
currentLocation = new Location("");
currentLocation.setLatitude(lat);
currentLocation.setLongitude(longi);
} else {
locationfinder.showSettingsAlert();
}
Location savedLocation = new Location("databaseLocation");
savedLocation.setLatitude(Double.parseDouble(latitude));
savedLocation.setLongitude(Double.parseDouble(longitude));
Double difference = currentLocation.distanceTo(savedLocation) * (0.001);
difference = Double.parseDouble(new DecimalFormat("##.##").format(difference));
String newDifference = String.valueOf(difference) + " km";
ServiceModel serviceModel = new ServiceModel(business_Id, business_Name, newDifference, locality);
list.add(serviceModel);
}
} catch (JSONException e) {
e.printStackTrace();
}
progressBar.setVisibility(View.GONE);
//adapter = new RVAdapter(RecyclerViewActivity.this, list);
//rv.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
#Override
public void onFailure(int statusCode, Header[] headers, byte[] errorResponse, Throwable e) {
}
});
Toast.makeText(this, "Net is present", Toast.LENGTH_SHORT).show();
}
}
RVAdapter.java
public class RVAdapter extends RecyclerView.Adapter<RVAdapter.PersonViewHolder>{
private final LayoutInflater mInflater;
List<ServiceModel> persons ;
private Context mContext;
public RVAdapter(Context context,List<ServiceModel> persons){
this.mInflater = LayoutInflater.from(context);
this.persons = new ArrayList<>(persons);
this.mContext = context;
}
#Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
}
#Override
public PersonViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item, viewGroup, false);
PersonViewHolder pvh = new PersonViewHolder(v);
return pvh;
}
#Override
public void onBindViewHolder(PersonViewHolder personViewHolder, int i) {
ServiceModel person = persons.get(i);
personViewHolder.businessName.setOnClickListener(clickListener);
personViewHolder.image_url.setOnClickListener(clickListenerImage);
personViewHolder.businessName.setTag(personViewHolder);
personViewHolder.difference.setTag(personViewHolder);
personViewHolder.business_id.setTag(personViewHolder);
personViewHolder.image_url.setTag(personViewHolder);
personViewHolder.locality.setTag(personViewHolder);
personViewHolder.businessName.setText(Html.fromHtml(person.getBusinessname()));
String firstLetter = String.valueOf(person.getBusinessname().charAt(0));
ColorGenerators generator = ColorGenerators.MATERIAL; // or use DEFAULT
int color = generator.getColor(person.getBusinessname());
TextDrawable drawable = TextDrawable.builder().buildRound(firstLetter, color); // radius in px
personViewHolder.image_url.setImageDrawable(drawable);
personViewHolder.difference.setText(Html.fromHtml(person.getNewDiffer()));
personViewHolder.locality.setText(Html.fromHtml(person.getLocality()));
personViewHolder.bind(person);
}
View.OnClickListener clickListener = new View.OnClickListener() {
#Override
public void onClick(View view) {
PersonViewHolder holder = (PersonViewHolder) view.getTag();
int position = holder.getPosition();
ServiceModel person = persons.get(position);
String businessids = person.getBusinessid();
Intent intent = new Intent(mContext, BusinessInfoActivity.class);
intent.putExtra("businessids", businessids);
mContext.startActivity(intent);
}
};
View.OnClickListener clickListenerImage = new View.OnClickListener() {
#Override
public void onClick(View view) {
PersonViewHolder holder = (PersonViewHolder) view.getTag();
int position = holder.getPosition();
ServiceModel person = persons.get(position);
String businessids = person.getBusinessid();
Intent intent = new Intent(mContext, BusinessInfoActivity.class);
intent.putExtra("businessids", businessids);
mContext.startActivity(intent);
}
};
#Override
public int getItemCount() {
return persons.size();
}
public void animateTo(List<ServiceModel> models) {
applyAndAnimateRemovals(models);
applyAndAnimateAdditions(models);
applyAndAnimateMovedItems(models);
}
private void applyAndAnimateRemovals(List<ServiceModel> newModels) {
for (int i = persons.size() - 1; i >= 0; i--) {
final ServiceModel model = persons.get(i);
if (!newModels.contains(model)) {
removeItem(i);
}
}
}
private void applyAndAnimateAdditions(List<ServiceModel> newModels) {
for (int i = 0, count = newModels.size(); i < count; i++) {
final ServiceModel model = newModels.get(i);
if (!persons.contains(model)) {
addItem(i, model);
}
}
}
private void applyAndAnimateMovedItems(List<ServiceModel> newModels) {
for (int toPosition = newModels.size() - 1; toPosition >= 0; toPosition--) {
final ServiceModel model = newModels.get(toPosition);
final int fromPosition = persons.indexOf(model);
if (fromPosition >= 0 && fromPosition != toPosition) {
moveItem(fromPosition, toPosition);
}
}
}
public ServiceModel removeItem(int position) {
final ServiceModel model = persons.remove(position);
notifyItemRemoved(position);
return model;
}
public void addItem(int position, ServiceModel model) {
persons.add(position, model);
notifyItemInserted(position);
}
public void moveItem(int fromPosition, int toPosition) {
final ServiceModel model = persons.remove(fromPosition);
persons.add(toPosition, model);
notifyItemMoved(fromPosition, toPosition);
}
public static class PersonViewHolder extends RecyclerView.ViewHolder {
protected CardView cv;
protected TextView businessName, difference, business_id, locality;
protected ImageView image_url;
public PersonViewHolder(View itemView) {
super(itemView);
cv = (CardView)itemView.findViewById(R.id.cv);
businessName = (TextView)itemView.findViewById(R.id.business_name);
difference = (TextView)itemView.findViewById(R.id.txtDifferenece);
business_id = (TextView)itemView.findViewById(R.id.business_id);
image_url = (ImageView)itemView.findViewById(R.id.thumbnail);
locality= (TextView)itemView.findViewById(R.id.txtLocality);
}
public void bind(ServiceModel model) {
businessName.setText(model.getBusinessname());
}
}
}
Please help me, How to set notifyDataSetChanged() to the adapter. it is not working in my code. I already checked all answers which is posted on the stackoverflow.
you are setting the new list to the RecyclerView Adapter , set the list in the Adapter:
make a method setItems(list) in adapter and call it before notifyDataSetChanged() and in adapter do
this.persons = new ArrayList<>(persons);
in setItems
add this method in adapter:
public void setItems(List<ServiceModel> persons) {
this.persons = persons;
}
and call it before notifyDataSetChanged() like this:
adapter.setItems(list);
adapter.notifyDataSetChanged();
Issue is in these lines..
adapter = new RVAdapter(RecyclerViewActivity.this, list);
rv.setAdapter(adapter);
adapter.notifyDataSetChanged();
You are initialising your adapter every time. No need to reinitialize it.
Just update your arraylist and invoking to adapter.notifyDataSetChanged(); will make it work.
Like #Beena mentioned, you are creating and setting new adapter ever time, in your success response.
One approach would be to create an adapter and set it to the recycler view only for the first time, and then onSuceess() of your api callback, call a method of your adapter.
In, them adapter method, just add that new data in your main arraylist and do notifyItemInserted() instead of notifyDataSetChanged, in this way you will also see the default adding animation of recyclerView.
Every time you fill your list call the method below:
if (adapter != null) // it works second time and later
adapter.notifyDataSetChanged();
else { // it works first time
adapter = new AdapterClass(context,list);
listView.setAdapter(adapter);
}
I solved this with added method in RVAdapter that call notifyDataSetChanged().
Simply in RVAdapter:
public void refreshList(){
notifyDataSetChanged();
}
and call this method in MainActivity when need:
rVAdapter.refreshList();
Related
I am trying to display posts from a server in listView. So I used recycle-view to achieve that. Everything is working fine except that ll items are displaying twice.
I counted the total fetched items from server, and the count is 5, but adapter.getItemCount is showing 10.
After searching hours on the internet, I tried following :
#Override
public long getItemId(int position) {
return position;
}
#Override
public int getItemViewType(int position) {
return position;
}
and
homeFragmentAdapter.setHasStableIds(true);
Below is my fragment...
package com.example.projectName;
import static android.content.Context.MODE_PRIVATE;
import static android.webkit.ConsoleMessage.MessageLevel.LOG;
import static com.bumptech.glide.load.resource.drawable.DrawableTransitionOptions.withCrossFade;
public class HomeFollowersFragment extends Fragment implements InfiniteScrollListener.OnLoadMoreListener, RecyclerViewItemListener {
private static final String TAG = "HomeFollowersFragment";
private static final String URL = "https://api.androidhive.info/json/movies_2017.json";
private RecyclerView recyclerView;
private ProgressBar postLoader;
FFmpeg ffmpeg;
// private List<Movie> movieList;
// private HomeAdapter mAdapter;
private List<PostList> postListGlobal = new ArrayList<>();
List<VerticalDataModal> verticalDataModals;
List<HorizontalDataModal> horizontalDataModals;
private SwipeRefreshLayout swipeMore;
private InfiniteScrollListener infiniteScrollListener;
private HomeFragmentAdapter homeFragmentAdapter;
SharedPreferences sharedPreferences;
private Boolean isLoggedIn = false;
private String email = "";
private String token = "";
private String userId = "";
private Dialog customLoader;
SkeletonScreen skeletonScreen;
private int pastVisiblesItems, visibleItemCount, totalItemCount;
private boolean loading = false;
private EndlessScrollListener scrollListener;
SharedPreferences sp;
SharedPreferences.Editor Ed;
public HomeFollowersFragment() {
//super();
}
/**
* #return A new instance of fragment HomeFollowersFragment.
*/
public static HomeFollowersFragment newInstance() {
return new HomeFollowersFragment();
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_home, container, false);
// ((AppCompatActivity) getActivity()).getSupportActionBar().show();
try{
sharedPreferences = getActivity().getSharedPreferences("Login", MODE_PRIVATE);
email = sharedPreferences.getString("email", null);
token = sharedPreferences.getString("token", null);
isLoggedIn = sharedPreferences.getBoolean("isLoggedIn", false);
userId = sharedPreferences.getString("id", null);
}catch (Exception e){
e.printStackTrace();
Log.d("StackError", "StackError: "+e);
}
sp = getActivity().getSharedPreferences("Posts", MODE_PRIVATE);
if(!isLoggedIn || token == null || userId == null){
Intent intent = new Intent(getActivity(), RegisterActivity.class);
intent.putExtra("loginFrom", "profile");
startActivity(intent);
}
recyclerView = view.findViewById(R.id.recycler_view);
postLoader = view.findViewById(R.id.post_loader);
swipeMore = view.findViewById(R.id.swipe_layout);
homeFragmentAdapter = new HomeFragmentAdapter(postListGlobal, this, "home");
if(sp.contains("postListGlobal"))
skeletonScreen = Skeleton.bind(recyclerView)
.adapter(homeFragmentAdapter)
.shimmer(true)
.angle(20)
.frozen(false)
.duration(1200)
.count(10)
.load(R.layout.item_skelton_home_page)
.show(); //default count is 10
RecyclerView.LayoutManager mLayoutManager = new GridLayoutManager(getActivity(), 2);
StaggeredGridLayoutManager sLayoutManager = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL);
recyclerView.setLayoutManager(sLayoutManager);
homeFragmentAdapter.setHasStableIds(true);
recyclerView.setAdapter(homeFragmentAdapter);
recyclerView.setNestedScrollingEnabled(false);
customLoader = new Dialog(getActivity(), R.style.crystal_range_seek_bar);
customLoader.setCancelable(false);
View loaderView = getLayoutInflater().inflate(R.layout.custom_loading_layout, null);
customLoader.getWindow().getAttributes().windowAnimations = R.style.crystal_range_seek_bar;
customLoader.getWindow().setBackgroundDrawableResource(R.color.translucent_black);
ImageView imageLoader = loaderView.findViewById(R.id.logo_loader);
Glide.with(this).load(R.drawable.logo_loader).into(imageLoader);
customLoader.setContentView(loaderView);
if(homeFragmentAdapter.getItemCount() == 0 && !loading){
// server fetchdata
Log.d(TAG, "no item available..");
postLoader.setVisibility(View.VISIBLE);
loading = true;
fetchStoreItems();
}else{
postLoader.setVisibility(View.GONE);
}
swipeMore.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
Log.d(TAG, "on refresh...");
fetchStoreItems();
}
});
return view;
}
#Override
public void onItemClicked(int position) {
Log.d(TAG, "click position: "+position);
Toast.makeText(getActivity(),postListGlobal.get(position).getTitle(),Toast.LENGTH_SHORT).show();
// Toast.makeText(getActivity(),""+position, Toast.LENGTH_SHORT).show();
}
public int getLastVisibleItem(int[] lastVisibleItemPositions) {
int maxSize = 0;
for (int i = 0; i < lastVisibleItemPositions.length; i++) {
if (i == 0) {
maxSize = lastVisibleItemPositions[i];
}
else if (lastVisibleItemPositions[i] > maxSize) {
maxSize = lastVisibleItemPositions[i];
}
}
return maxSize;
}
#Override
public void onLoadMore() {
homeFragmentAdapter.addNullData();
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
homeFragmentAdapter.removeNull();
Toast.makeText(getContext(), "load more here...", Toast.LENGTH_LONG).show();
// fetchStoreItems();
swipeMore.setRefreshing(false);
}
}, 2000);
}
private void fetchStoreItems() {
RequestQueue queue = Volley.newRequestQueue(getActivity());
Log.d(TAG, "Post Data Followers: "+Constant.FETCH_POSTS_API);
CacheRequest cacheRequest = new CacheRequest(0, Constant.FETCH_POSTS_API, new Response.Listener<NetworkResponse>() {
#Override
public void onResponse(NetworkResponse response) {
try {
final String jsonString = new String(response.data,
HttpHeaderParser.parseCharset(response.headers));
if (response == null) {
Toast.makeText(getActivity(), "Couldn't fetch the store items! Pleas try again.", Toast.LENGTH_LONG).show();
loading = false;
return;
}
JSONObject postObj = new JSONObject(jsonString);
System.out.println("post full data... : " + postObj);
if (postObj.getBoolean("Status")) {
try {
postLoader.setVisibility(View.GONE);
JSONArray arrayResponse = postObj.optJSONArray("Data");
int dataArrLength = arrayResponse.length();
if(dataArrLength == 0){
Toast.makeText(getActivity(), "No posts available at this time, you can create yout own post by clicking on mic button", Toast.LENGTH_SHORT).show();
}
postListGlobal.clear();
Log.d(TAG, "Total Posts count: "+dataArrLength);
for(int i=0; i<dataArrLength; i++) {
try {
JSONObject dataListObj = arrayResponse.optJSONObject(i);
System.out.println("post full data... : " + dataListObj);
JSONObject postDetailObj = dataListObj.optJSONObject("post_detail");
JSONObject followDtatusObj = dataListObj.optJSONObject("follow_status");
JSONArray postFilesArr = dataListObj.optJSONArray("post_files");
JSONObject userDatasObj = postDetailObj.optJSONObject("user");
String userId = userDatasObj.optString("id");
String userName = userDatasObj.optString("email");
String userImage = userDatasObj.optString("email");
boolean followStatus = followDtatusObj.optBoolean("follow");
String postId = postDetailObj.optString("id");
String postTitle = postDetailObj.optString("post_title");
String postDescription = postDetailObj.optString("post_description");
String postCoverUrl = postDetailObj.optString("post_coverurl", "1");
String postViewType = postDetailObj.optString("view_type", "1");
String postAllowComment = postDetailObj.optString("allow_comments", "1");
String postAllowDownload = postDetailObj.optString("allow_download", "1");
String postTotalPost = postDetailObj.optString("total_post", "1");
String postPostSection = postDetailObj.optString("post_section", "image");
String postActiveStatus = postDetailObj.optString("is_active", "1");
String postTotalViews = postDetailObj.optString("total_watched","0");
String postTotalShare = postDetailObj.optString("total_share","0");
String postTotalDownload = postDetailObj.optString("total_download","0");
String postTotalReaction = postDetailObj.optString("total_reaction","0");
String postTotalLike = postDetailObj.optString("total_like","0");
String postTotalSmile = postDetailObj.optString("smile_reaction","0");
String postTotalLaugh = postDetailObj.optString("laugh_reaction","0");
String postTotalSad = postDetailObj.optString("sad_reaction","0");
String postTotalLove = postDetailObj.optString("love_reaction","0");
String postTotalShock = postDetailObj.optString("shock_reaction","0");
int totalPostFiles = Integer.parseInt(postTotalPost);
int postArrLength = postFilesArr.length();
String postImageUrl = null;
String postMusicUrl = null;
String commonUrl = "http://serverName.com/";
if(postArrLength >= 1){
JSONObject dataFilesListObj = postFilesArr.optJSONObject(0);
// System.out.println("post files full data... : " + dataFilesListObj);
String postFileId = dataFilesListObj.optString("id");
postImageUrl = dataFilesListObj.optString("image_file_path");
postMusicUrl = dataFilesListObj.optString("music_file_path");
System.out.println("post files full data... : " + dataFilesListObj);
}
System.out.println("post files full data... : " + commonUrl+postMusicUrl);
System.out.println("post files full data... : " + commonUrl+postImageUrl);
PostList postList = new PostList();
postList.setId(postId);
postList.setTitle(postTitle);
postList.setTotalPost(""+dataArrLength);
postList.setTotalView(postTotalViews);
postList.setTotalReaction(postTotalReaction);
postList.setMusicPath(commonUrl+postMusicUrl);
postList.setImagePath(commonUrl+postImageUrl);
if(postImageUrl == null){
postList.setImagePath("https://amazonBucket.s3.location.amazonaws.com/images/pic1.jpg");
}
postList.setUserId(userId);
postList.setUserName(userName);
postList.setPostDataObject(arrayResponse);
postListGlobal.add(postList);
Log.d(TAG, "Total Posts: "+dataListObj);
} catch (Exception e) {
e.printStackTrace();
Log.d(TAG, "Post Data Error1: "+e);
Toast.makeText(getActivity(), "File now found", Toast.LENGTH_LONG).show();
loading = false;
}
}
} catch (Exception e){
e.printStackTrace();
Log.d(TAG, "Post Data Error2: "+e);
Toast.makeText(getActivity(), R.string.server_error, Toast.LENGTH_LONG).show();
loading = false;
}
}else{
try {
Toast.makeText(getActivity(), new JSONObject(jsonString).getString("Message"), Toast.LENGTH_LONG).show();
} catch (JSONException ex) {
ex.printStackTrace();
Log.d(TAG, "Post Data Error3: "+ex);
Toast.makeText(getActivity(), R.string.server_error, Toast.LENGTH_SHORT).show();
}
loading = false;
}
// refreshing recycler view
homeFragmentAdapter.removeNull();
homeFragmentAdapter.addData(postListGlobal);
homeFragmentAdapter.notifyDataSetChanged();
// save in local memory
// saveArrayList(postListGlobal, "postListGlobal");
} catch (Exception e) {
e.printStackTrace();
Log.d(TAG, "Post Data Error4: "+e);
}
loading = true;
homeFragmentAdapter.notifyDataSetChanged();
swipeMore.setRefreshing(false);
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getActivity(), "onErrorResponse: "+ error, Toast.LENGTH_SHORT).show();
swipeMore.setRefreshing(false);
loading = true;
homeFragmentAdapter.notifyDataSetChanged();
postLoader.setVisibility(View.VISIBLE);
loading = false;
Log.d(TAG, "Post Data Error5: "+error);
}
}){
#Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String, String> params = new HashMap<String, String>();
String finalToken = "Bearer "+token;
params.put("Authorization", finalToken);
params.put("Content-Type", "application/json");
return params;
}
};
// Add the request to the RequestQueue.
queue.add(cacheRequest);
}
private class CacheRequest extends Request<NetworkResponse> {
private final Response.Listener<NetworkResponse> mListener;
private final Response.ErrorListener mErrorListener;
public CacheRequest(int method, String url, Response.Listener<NetworkResponse> listener, Response.ErrorListener errorListener) {
super(method, url, errorListener);
this.mListener = listener;
this.mErrorListener = errorListener;
}
#Override
protected Response<NetworkResponse> parseNetworkResponse(NetworkResponse response) {
Cache.Entry cacheEntry = HttpHeaderParser.parseCacheHeaders(response);
if (cacheEntry == null) {
cacheEntry = new Cache.Entry();
}
final long cacheHitButRefreshed = 3 * 60 * 1000; // in 3 minutes cache will be hit, but also refreshed on background
final long cacheExpired = 24 * 60 * 60 * 1000; // in 24 hours this cache entry expires completely
long now = System.currentTimeMillis();
final long softExpire = now + cacheHitButRefreshed;
final long ttl = now + cacheExpired;
cacheEntry.data = response.data;
cacheEntry.softTtl = softExpire;
cacheEntry.ttl = ttl;
String headerValue;
headerValue = response.headers.get("Date");
if (headerValue != null) {
cacheEntry.serverDate = HttpHeaderParser.parseDateAsEpoch(headerValue);
}
headerValue = response.headers.get("Last-Modified");
if (headerValue != null) {
cacheEntry.lastModified = HttpHeaderParser.parseDateAsEpoch(headerValue);
}
cacheEntry.responseHeaders = response.headers;
return Response.success(response, cacheEntry);
}
#Override
protected void deliverResponse(NetworkResponse response) {
mListener.onResponse(response);
}
#Override
protected VolleyError parseNetworkError(VolleyError volleyError) {
Log.d(TAG, "Post Data volleyError: "+volleyError);
return super.parseNetworkError(volleyError);
}
#Override
public void deliverError(VolleyError error) {
mErrorListener.onErrorResponse(error);
}
}
}
and Adapter Class
package com.example.ProjectName;
public class HomeFragmentAdapter extends RecyclerView.Adapter <HomeFragmentAdapter.HomeViewHolder>{
// private ArrayList<Integer> dataList;
private List<PostList> postListGlobal;
int VIEW_TYPE_LOADING;
int VIEW_TYPE_ITEM;
Context context;
private RecyclerViewItemListener callback;
FFmpeg ffmpeg;
String callingPage;
public HomeFragmentAdapter(List<PostList> postListGlobal, RecyclerViewItemListener callback, String callingPage) {
this.postListGlobal = postListGlobal;
this.callback = callback;
this.callingPage = callingPage;
// setHasStableIds(true);
}
#NonNull
#Override
public HomeFragmentAdapter.HomeViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View root = null;
context = parent.getContext();
root = LayoutInflater.from(parent.getContext()).inflate(R.layout.adapter_home_tile_list, parent, false);
return new DataViewHolder(root);
}
#Override
public void onBindViewHolder(#NonNull HomeFragmentAdapter.HomeViewHolder holder, int position) {
if (holder instanceof DataViewHolder) {
final PostList postList = postListGlobal.get(position);
holder.postTitle.setText(postList.getTitle());
holder.postWatch.setText(postList.getTotalView());
holder.postReaction.setText(postList.getTotalReaction());
String imageUrl = postList.getImagePath();
// String imageUrl = Constant.SERVER_URL+"/"+postList.getImagePath();
String musicUrl = postList.getMusicPath();
// String musicUrl = Constant.SERVER_URL+"/"+postList.getMusicPath();
Log.d(TAG, "Post url: "+imageUrl+" -- "+musicUrl);
// int totalMusicTime = getDurationVal(musicUrl, "second");
holder.postTime.setText(postList.getTotalPost());
holder.thumbnail.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
callback.onItemClicked(position);
Log.d("homeView", "screenName : "+callingPage);
if(callingPage.equals("home")){
Log.d("homeView", "screenName : "+position);
Intent intent = new Intent(context, MainViewActivity.class);
intent.putExtra("loginFrom", "homeView");
intent.putExtra("postDataObj", postList.getPostDataObject().toString());
intent.putExtra("postPosition", ""+position);
intent.putExtra("tabId", "1");
context.startActivity(intent);
}
}
});
Drawable mDefaultBackground = context.getResources().getDrawable(R.drawable.influencers);
CircularProgressDrawable circularProgressDrawable = new CircularProgressDrawable(context);
circularProgressDrawable.setStrokeWidth(5f);
Glide.with(context)
.load(imageUrl)
.listener(new RequestListener<Drawable>() {
#Override
public boolean onLoadFailed(#Nullable GlideException e, Object model, Target<Drawable> target, boolean isFirstResource) {
// progressBar.setVisibility(View.GONE);
return false;
}
#Override
public boolean onResourceReady(Drawable resource, Object model, Target<Drawable> target, DataSource dataSource, boolean isFirstResource) {
// progressBar.setVisibility(View.GONE);
return false;
}
})
.error(mDefaultBackground)
.into(holder.thumbnail);
}else{
//Do whatever you want. Or nothing !!
}
}
#Override
public int getItemCount() {
return postListGlobal.size();
}
class DataViewHolder extends HomeViewHolder {
public DataViewHolder(View itemView) {
super(itemView);
}
}
class ProgressViewHolder extends HomeViewHolder {
public ProgressViewHolder(View itemView) {
super(itemView);
}
}
class HomeViewHolder extends RecyclerView.ViewHolder {
public TextView postTitle, postTime, postWatch, postReaction;
public ImageView thumbnail;
public HomeViewHolder(View itemView) {
super(itemView);
postTitle = itemView.findViewById(R.id.post_title);
postTime = itemView.findViewById(R.id.total_time);
postWatch = itemView.findViewById(R.id.total_watch);
postReaction = itemView.findViewById(R.id.total_reaction);
thumbnail = itemView.findViewById(R.id.thumbnail);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public int getItemViewType(int position) {
return position;
}
public void addNullData() {
}
public void removeNull() {
notifyItemRemoved(postListGlobal.size());
}
public void addData(List<PostList> postLists) {
postListGlobal.addAll(postLists);
notifyDataSetChanged();
}
}
After trying everything, I was still not able to resolve the issue. Any help/suggestions are welcome. Let me know If I left out any needed code--if so I can update it here.
`postListGlobal.add(postList);` below this line add ` homeFragmentAdapter.notifyDataSetChanged();` and remove ` homeFragmentAdapter.removeNull(); homeFragmentAdapter.addData(postListGlobal);homeFragmentAdapter.notifyDataSetChanged();` this code.Because in this case list added twice without notifying datasetchange check with your code by removing this.
postListGlobal.clear(); just clear tha arraylist before add .
postListGlobal.clear() before adding new list to the adapter.
And then notifyDataSetChanged() to let adapter know of the changes.
Hi guys I dont have much experience with AsyncTask and this is my first time using RecyclerView besides a couple of tutorials I done to learn about it.
If I use dummy data in EventActivity everything works fine and a list shown on the screen. But when I create an ArrayList of EventItems and pass that to the adapter it's just a blank screen. The JSON from localhost is being parsed and sent to the EventItem class. I have tried several things to get it to work but as my experience with AsyncTask and RecyclerView are limited I end up just crashing the app and getting a null pointer exception.
I think that the RecyclerView is being created before the JSON has been retrieved from localhost and this is what's causing the blank screen or null pointer exception but I'm not 100% sure and dont know how to fix the issue if I am correct.
Any help is appreciated.
EventActivity
public class EventActivity extends AppCompatActivity {
private RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_event);
fetchEvents();//call EventBackgroundWorker
//ArrayList<EventItem> eventList = new EventItem().getRecyclerList();//causes java null pointer exception
ArrayList<EventItem> eventList = new ArrayList<>();
//Dummie data
// eventList.add(new EventItem (1, "Title1", "Date", "endDate", "Location1", 5, 1111));
// eventList.add(new EventItem (R.drawable.ic_favourite, "Title2", "11/07/2018", "11/07/2018", "Wales", 10, 5));
// eventList.add(new EventItem (R.drawable.ramspeed_custom, "Title3", "11/01/2018", "11/09/2018", "Paris, France", 0, 90));
// eventList.add(new EventItem (R.drawable.ramspeed_custom, "Title4", "12/01/2018", "11/09/2018", "New York", 20, 500));
// eventList.add(new EventItem (R.drawable.ic_favourite, "Title5", "Mon 11/05/2015", "11/09/2018", "London, England", 5, 500));
// eventList.add(new EventItem (R.drawable.biker, "Title6", "Mon 11/05/2018", "20/07/2018", "Swords Dublin", 0, 500));
mRecyclerView = (RecyclerView) findViewById(R.id.event_recycler_view);
mRecyclerView.setHasFixedSize(true);//increase performance of app if recyclerView does not increase in size
mLayoutManager = new LinearLayoutManager(this);
// mAdapter = new EventAdapter(eventList);
mAdapter = new EventAdapter(eventList);//context added for testing //////////////////////////////
// mAdapter = new EventAdapter(new ArrayList<EventItem>(0));
mRecyclerView.setLayoutManager(mLayoutManager);
mRecyclerView.setAdapter(mAdapter);
// buildRecyclerView();
}
//run background thread
private void fetchEvents(){
// String username = "user";
// String userPassword = "password";
String startConnectionCondition = "event";
//this passes the context
EventBackgroundWorker backgroundWorker = new EventBackgroundWorker(this);
backgroundWorker.execute(startConnectionCondition, null);
}
/* private void buildRecyclerView(){
ArrayList<EventItem> eventList = new EventItem().getRecyclerList();
mRecyclerView = (RecyclerView) findViewById(R.id.event_recycler_view);
mRecyclerView.setHasFixedSize(true);//increase performance of app if recyclerView does not increase in size
mLayoutManager = new LinearLayoutManager(this);
// mAdapter = new EventAdapter(eventList);
mAdapter = new EventAdapter(eventList);//context added for testing
// mAdapter = new EventAdapter(new ArrayList<EventItem>(0));
mRecyclerView.setLayoutManager(mLayoutManager);
mRecyclerView.setAdapter(mAdapter);
}
*/
/* public void showEventList(boolean b){
ArrayList<EventItem> eventList = new ArrayList<>();
for(int i =0; i< eventList.size(); i++){
eventList.get(i);
Log.d("tag","eventList from main " + eventList);
}
mAdapter = new EventAdapter(eventList);
mRecyclerView.setLayoutManager(mLayoutManager);
mRecyclerView.setAdapter(mAdapter);
}*/
}//MainActivity
EventAdapter
public class EventAdapter extends RecyclerView.Adapter<EventAdapter.EventViewHolder> {
private ArrayList<EventItem> mEventList;
Context context;
//constructor for EventAdapter
public EventAdapter(ArrayList<EventItem> eventList){
// context =c;
mEventList = eventList;
Log.d("tag","EventAdapter eventlist variable called from constructor " + eventList);
}
public static class EventViewHolder extends RecyclerView.ViewHolder{
public ImageView mPromoImage;
public TextView mTitle;
public TextView mStartDate;
public TextView mEndDate;
public TextView mLocation;
public TextView mFee;
public ImageView mFavourite;
//constructor for EventViewHolder class
public EventViewHolder(View itemView) {
super(itemView);
// mPromoImage = (ImageView) itemView.findViewById(R.id.event_promotional_image);
mTitle = (TextView) itemView.findViewById(R.id.event_title_textView);
mStartDate = (TextView) itemView.findViewById(R.id.event_start_textView);
mEndDate = (TextView) itemView.findViewById(R.id.event_end_textView);
mLocation = (TextView) itemView.findViewById(R.id.event_location_textView);
mFee = (TextView) itemView.findViewById(R.id.event_fee_textView);
// mFavourite = (ImageView) itemView.findViewById(R.id.event_favourite_image);
Log.d("tag", "EventViewHolder being called");
}
}//EventViewHolder class
#Override
public EventViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_event, parent, false);
//create view holder
EventViewHolder viewHolder = new EventViewHolder(v);
return viewHolder;
}
//pass values to inflated XML Views in item_event.xml
#Override
public void onBindViewHolder(EventViewHolder holder, int position) {
EventItem currentEvent = mEventList.get(position);
// holder.mPromoImage.setImageResource(currentEvent.getEventPromoImage());
holder.mTitle.setText(currentEvent.getEventTitle());
holder.mStartDate.setText(currentEvent.getEventStartDate());
holder.mEndDate.setText(currentEvent.getEventEndDate());
holder.mLocation.setText(currentEvent.getEventLocation());
holder.mFee.setText(String.valueOf(currentEvent.getEventFee()));//int value passed
// holder.mFavourite.setImageResource(currentEvent.getEventFavourite());
//Log.d("tag", "position" + position );
Log.d("tag","eventAdapter " + currentEvent.getEventTitle());
}
//how many items there will be
#Override
public int getItemCount() {
return mEventList.size();
}
}
EventItem
public class EventItem {
private int mEventPromoImage;
private int mId;
private String mEventTitle;
private String mEventStartDate;
private String mEventEndDate;
private String mEventLocation;
private int mEventFee;
private int mEventViews;
// public EventItem(){}
public EventItem(int id, String eventTitle, String eventStartDate,
String eventEndDate, String eventLocation, int eventFee, int eventViews){
// mEventPromoImage = eventPromoImage;
mId = id;
mEventTitle = eventTitle;
mEventStartDate = eventStartDate;
mEventEndDate = eventEndDate;
mEventLocation = eventLocation;
mEventFee = eventFee;
mEventViews = eventViews;
Log.d("tag","EVENTITEM title EventItem" + mEventTitle);
// Log.d("tag","EVENTITEM startDate EventItem" + mEventStartDate );
// Log.d("tag","EVENTITEM endDate EventItem" + mEventEndDate );
// Log.d("tag","EVENTITEM address EventItem" + mEventLocation);
// Log.d("tag","EVENTITEM fee EventItem" + mEventFee);
}
public int getEventPromoImage() {
return mEventPromoImage;
}
public void setEventPromoImage(int mEventPromoImage) {
this.mEventPromoImage = mEventPromoImage;
}
public int getEventId() {
return mId;
}
public void setEventId(int mId){
this.mId = mId;
}
public String getEventTitle() {
Log.d("tag","getEventTitle() " + mEventTitle);
return mEventTitle;
}
public void setEventTitle(String mEventTitle) {
this.mEventTitle = mEventTitle;
}
public String getEventStartDate() {
return mEventStartDate;
}
public void setEventStartDate(String mEventStartDate) {
this.mEventStartDate = mEventStartDate;
}
public String getEventEndDate(){
return mEventEndDate;
}
public void setEventEndDate(String mEventEndDate){
this.mEventEndDate = mEventEndDate;
}
public String getEventLocation() {
return mEventLocation;
}
public void setEventLocation(String mEventLocation) {
this.mEventLocation = mEventLocation;
}
public int getEventFee() {
return mEventFee;
}
public void setEventFee(int mEventFee) {
this.mEventFee = mEventFee;
}
public int getEventViews(){
return mEventViews;
}
public void getEventViews(int mEventViews) {
this.mEventViews = mEventViews;
}
public ArrayList<EventItem> getRecyclerList(){
ArrayList event = new ArrayList();
event.add(mEventTitle);
event.add(mEventStartDate);
event.add(mEventEndDate);
event.add(mEventLocation);
event.add(mEventFee);
event.add(mEventViews);
return event;
}
}
EventBackgroundWorker
public class EventBackgroundWorker extends AsyncTask<String, Void, String> {
Context context;
AlertDialog alert;
public static final String REQUEST_URL = "http://10.0.2.2/m/event/";
public EventBackgroundWorker(Context ctxt) {
context = ctxt;
}
//Invoked on UI thread before doInBackground is called
#Override
protected void onPreExecute() {
alert = new AlertDialog.Builder(context).create();
alert.setTitle("Result from server");
}
#Override
protected String doInBackground(String... params) {
String type = params[0];//eventList
//String login_url = "http://10.0.2.2/m/event/";
if(type.equals("event")){
try {
String user_name = params[1];
URL url = new URL(REQUEST_URL);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
httpURLConnection.connect();//works without this connect Find out why
OutputStream outputStream = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
String post_data = URLEncoder.encode("getEvents", "UTF-8");
bufferedWriter.write(post_data);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
//read response
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "iso-8859-1"));
String result = "";
String line;
while((line = bufferedReader.readLine()) != null){
result += line;
}
//parse JSON event Array
// Create an empty ArrayList that we can start adding events to
ArrayList<EventItem> eventArray = new ArrayList<>();
JSONArray baseJsonResponse = new JSONArray(result);
for(int i =0; i < baseJsonResponse.length(); i++){
JSONObject event = baseJsonResponse.getJSONObject(i);
int id = event.getInt("id");
String title = event.getString("title");
String address = event.getString("address");
String startDate = event.getString("startDate");
String endDate = event.getString("endDate");
int fee = event.getInt("fee");
int views = event.getInt("views");
//Send data to eventItem Object
EventItem eventObject = new EventItem(id,title,address,startDate,endDate,fee,views);
eventArray.add(eventObject);
/* Log.d("tag", "JSON id " + id);
Log.d("tag", "JSON title " + title);
Log.d("tag", "JSON address " + address);
Log.d("tag", "JSON startDate " + startDate);
Log.d("tag", "JSON endDate " + endDate);
Log.d("tag", "JSON fee " + fee);
Log.d("tag", "JSON views " + views);*/
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
return result;
} catch (MalformedURLException e) {//added for URL object
e.printStackTrace();
} catch (IOException e) {
//HTPURLConnection
} catch (JSONException e) {
e.printStackTrace();
}
}
return null;
}
#Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
//results from doInBackground are passed here
#Override
protected void onPostExecute(String result) {
Log.d("tag", "onPostExecute called" + result);
alert.setMessage(result);
alert.show();
}
}
The AsyncTask creates eventArray but does nothing with it. doInBackground() should return the eventArray and onPostExecute() should set it as adapter content (by a Callback or by setting the Adapter instance at the AsyncTask object). Your Adapter should have a setter for the content which should call notifyDataSetChanged().
Please help me out to load more data from the server upon scrolling my RecyclerView . Here I have successfully created RecyclerView by loading data from my Mysql server by using volley string request.
Here is my code.
private void populateRecycleView() {
if (Utility.checkNetworkConnection(this)) {
final ProgressDialog progressDialog = new ProgressDialog(this);
progressDialog.setTitle("Searching...");
progressDialog.setMessage("Searching for the blood donor. Please wait a moment.");
progressDialog.setCancelable(false);
progressDialog.show();
StringRequest stringRequest = new StringRequest(Request.Method.POST, Constants.GET_DONORS_URL,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
progressDialog.dismiss();
try {
JSONArray jsonArray = new JSONArray(response);
int count = 0;
while (count < jsonArray.length()) {
JSONObject jsonObject = jsonArray.getJSONObject(count);
String firstName = jsonObject.getString("fName");
String secondName = jsonObject.getString("sName");
String email = jsonObject.getString("emailid");
String password = jsonObject.getString("pass");
String mobile = jsonObject.getString("mobile");
String bloodRt = jsonObject.getString("blood");
String age = jsonObject.getString("age");
String gender = jsonObject.getString("gender");
String country = jsonObject.getString("country");
String location = jsonObject.getString("location");
String latitude = jsonObject.getString("latitude");
String longitude = jsonObject.getString("longitude");
String profilePicFIleName = jsonObject.getString("picname");
String profilePicURL = jsonObject.getString("pic");
Donor donor = new Donor(firstName, secondName, email, password, mobile, bloodRt, age, gender,
country, location, latitude, longitude, profilePicFIleName, profilePicURL);
donorsList.add(donor);
count++;
}
donorsAdapter = new DonorsAdapter(FindDonorResult.this, donorsList);
recyclerView = (RecyclerView) findViewById(R.id.rv_search_result_donor);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(FindDonorResult.this));
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setAdapter(donorsAdapter);
donorsAdapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
progressDialog.dismiss();
Toast.makeText(FindDonorResult.this, "Active data network is not available.", Toast.LENGTH_LONG).show();
}
}
) {
#Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("bloodGroup", bloodGroup);
return params;
}
};
NetworkRequestSingleTon.getOurInstance(this).addToRequestQue(stringRequest);
} else {
Utility.checkNetworkConnectionFound(this);
}
}
And this is my RecyclerView adapter...
public class DonorsAdapter extends RecyclerView.Adapter<DonorsAdapter.CustomViewHolder> {
private Context context;
private ArrayList<Donor> donorList;
private String bloodGroup;
public DonorsAdapter(Context context, ArrayList<Donor> donorList) {
this.context = context;
this.donorList = donorList;
}
#Override
public CustomViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.rv_blood_donors_result,
parent, false);
return new CustomViewHolder(view);
}
#Override
public void onBindViewHolder(CustomViewHolder holder, int position) {
final Donor donor = donorList.get(position);
String displayName = donor.getFirstName() + " " + donor.getSecondName();
holder.tvDisplayName.setText(displayName);
holder.tvEmailID.setText(donor.getEmail());
String userProfileURL = donor.getProfilePicURL();
if (!userProfileURL.equals("")) {
Picasso.with(context).load(userProfileURL).resize(80, 80).centerCrop().
into(holder.ivProfilePic);
} else {
holder.ivProfilePic.setImageResource(R.drawable.ic_person_white_24dp);
}
bloodGroup = donor.getBloodGroup();
if (bloodGroup.equals("A+"))
holder.ivBloodTypeDisplay.setImageResource(R.drawable.a_);
else if (bloodGroup.equals("A-"))
holder.ivBloodTypeDisplay.setImageResource(R.drawable.a_negative);
else if (bloodGroup.equals("B+"))
holder.ivBloodTypeDisplay.setImageResource(R.drawable.b_positive);
else if (bloodGroup.equals("B-"))
holder.ivBloodTypeDisplay.setImageResource(R.drawable.b_negative);
else if (bloodGroup.equals("O+"))
holder.ivBloodTypeDisplay.setImageResource(R.drawable.o_positive);
else if (bloodGroup.equals("O-"))
holder.ivBloodTypeDisplay.setImageResource(R.drawable.o_negative);
else if (bloodGroup.equals("AB+"))
holder.ivBloodTypeDisplay.setImageResource(R.drawable.ab_positive);
else if (bloodGroup.equals("AB-"))
holder.ivBloodTypeDisplay.setImageResource(R.drawable.ab_negative);
if(Utility.isNetworkEnabled){
holder.constraintLayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(context, DisplayDonorDetails.class);
intent.putExtra("donor", donor);
context.startActivity(intent);
}
});
}else {
Toast.makeText(context, "Network not available.", Toast.LENGTH_SHORT).show();
}
}
#Override
public int getItemCount() {
if(donorList != null){
return donorList.size();
}else {
return 0;
}
}
public class CustomViewHolder extends RecyclerView.ViewHolder {
ImageView ivProfilePic, ivBloodTypeDisplay, ivArrow;
TextView tvDisplayName;
TextView tvEmailID;
ConstraintLayout constraintLayout;
public CustomViewHolder(View itemView) {
super(itemView);
ivProfilePic = (ImageView) itemView.findViewById(R.id.civ_user_profile_picture);
ivBloodTypeDisplay = (ImageView) itemView.findViewById(R.id.civ_user_blood_type_display);
ivArrow = (ImageView) itemView.findViewById(R.id.civ_arrow);
tvDisplayName = (TextView) itemView.findViewById(R.id.tvUserNameOnRV);
tvEmailID = (TextView) itemView.findViewById(R.id.tvEmailDisplayOnRV);
constraintLayout = (ConstraintLayout) itemView.findViewById(R.id.recycle_view_item_container);
}
}
}
Populate your donorsAdapter only with the 50 first elements of your donorsList, create a function that save the position of the latest element displayed and add other 50 donors to your adapter starting from the latest position saved when you need it.
Hope it helps.
EDIT
First create an emptyList:
List<Donor> subElements = new ArrayList<>();
and pass it to your adapter:
donorsAdapter = new DonorsAdapter(FindDonorResult.this, subElements);
Now you can create a method like this (you can call in onClick event for example):
private int LAST_POSITION = 0;
private int DONORS_NUM_TOSHOW = 50;
public void showMoreDonors(){
if(donarsList.size() > Last_postion+50){
List<Donor> tempList = new ArrayList<Donor>(donorsList.subList(Last_postion,Last_postion+DONORS_NUM_TOSHOW));
for(Donor a : tempList){
subElements.add(a);
}
Last_postion += DONORS_NUM_TOSHOW;
donorsAdapter.notifyDataSetChanged();
}else{
List<Donor> tempList = new ArrayList<Donor>(donorsList.subList(Last_postion,donorsList.size()));
for(Donor a : tempList){
subElements.add(a);
}
donorsAdapter.notifyDataSetChanged();
}
}
Remember to check when donorsList is over.
I didn't test it, but i hope it is usefull to understand the idea.
Finally, I sort this out. I have got an awesome tutorial from this blog.
http://android-pratap.blogspot.in/2015/06/endless-recyclerview-with-progress-bar.html.
I made some changes to populate the list because my data is on a remote server and by using volley library I fetched the data into the list. Remaining things are same.
I need to add my Items one by one to my RcyclerView for example add first item to recyclerView and show then add another item....
I have a volley that connect to a service then get me some data, in this volley I call a method :
private void makeJsonArryReq(String uri) {
userPointList = new ArrayList<>();
orginal = new ArrayList<>();
final JsonArrayRequest req = new JsonArrayRequest(uri,
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
orginal = MarketingPoints_JSONParser.FeedOriginal(response.toString(), mUser_Code, ReportActivity.this);
userPointList = MarketingPoints_JSONParser.parseFeed(response.toString(), mUser_Code, ReportActivity.this);
FillList();
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d("Custom Log Error", "Error: " + error.getMessage());
}
});
AppController.getInstance().addToRequestQueue(req, tag_json_arry);
}
when I call this method FillList(); it fill and show first item on RecyclerView,How can I listen to adapter for finalized and call FillList(); again for next item .
My FillList():
public void FillList() {
Geocoder geocoder = new Geocoder(activity, Locale.getDefault());
List<Address> addresses;
StepModel stp = null;
List<StepModel> Step = new ArrayList<>();
if (check < userPointList.size()) {
try {
addresses = geocoder.getFromLocation(userPointList.get(check).getLat(), userPointList.get(check).getLng(), 1);
stp = new StepModel();
stp.setsCity(addresses.get(0).getAdminArea());
stp.setsStreet(addresses.get(0).getThoroughfare());
stp.setSlat(userPointList.get(check).getLat());
stp.setSlng(userPointList.get(check).getLng());
stp.setSdate(userPointList.get(check).getDate());
stp.setStime(userPointList.get(check).getTime());
stp.setsCounts(userPointList.get(check).getCounts());
stp.setSprofilePhoto(userPointList.get(check).getProfilePhoto());
stp.setsUserCode(userPointList.get(check).getUserCode());
Step.add(stp);
} catch (IOException e) {
e.printStackTrace();
}
pointAdapter = new PointsList_Adapter(Step, ReportActivity.this,this, city, street);
Points_Recycler.setAdapter(pointAdapter);
pointAdapter.notifyDataSetChanged();
check++;
}else {
return;
}
}
Explain :
I connect to a service then I get a json then I convert it and store in a List.In my json I have two specific data (Lat and lng) that I should get name country and name street(For example 100 lat lng) then show on recyclerView but it get long time because I should fill recyclerView on by one.
My adapter :
public class PointsList_Adapter extends RecyclerView.Adapter<PointsList_Adapter.ViewHolder> {
int count = 0;
private List<StepModel> mpList;
public static Activity activity;
public static boolean flagItem = true;
public static boolean flagToast = true;
private mstep Mstep;
public PointsList_Adapter(List<StepModel> userCodeList, Activity activity) {
this.mpList = userCodeList;
this.activity = activity;
}
#Override
public PointsList_Adapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
// create a new view
View itemLayoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.listpoints_cardview, null);
// create ViewHolder
ViewHolder viewHolder = new ViewHolder(itemLayoutView);
return viewHolder;
}
#Override
public void onBindViewHolder(PointsList_Adapter.ViewHolder viewHolder, final int position) {
String dateValue = mpList.get(position).getDate();
final String countValue = String.valueOf(mpList.get(position).getCounts());
final Double lat = mpList.get(position).getLat();
final Double lng = mpList.get(position).getLng();
final String userCode = mpList.get(position).getUserCode();
final String time = mpList.get(position).getTime();
final int counts = mpList.get(position).getCounts();
final String city = mpList.get(position).getCity();
final String street = mpList.get(position).getStreet();
viewHolder.txtDate.setText(dateValue);
viewHolder.txtPoints.setText(lat + " , " + lng);
viewHolder.txtTime.setText(time);
viewHolder.txtAddress.setText(city + " , " + street);
viewHolder.txtCount.setText(countValue);
}
#Override
public int getItemCount() {
return mpList.size();
}
public static class ViewHolder extends RecyclerView.ViewHolder {
public TextView txtDate, txtPoints, txtTime, txtAddress, txtCount;
public LinearLayout lLstPoints;
public ViewHolder(View itemLayoutView) {
super(itemLayoutView);
txtDate = (TextView) itemLayoutView.findViewById(R.id.txtDate);
txtPoints = (TextView) itemLayoutView.findViewById(R.id.txtPoints);
txtTime = (TextView) itemLayoutView.findViewById(R.id.txtTime);
txtAddress = (TextView) itemLayoutView.findViewById(R.id.txtAddress);
txtCount = (TextView) itemLayoutView.findViewById(R.id.txtCount);
lLstPoints = (LinearLayout) itemLayoutView.findViewById(R.id.lLstPoints);
}
}
}
Please add below method in your adapter:
public reloadList(ArrayList<String> mpList) {
this.mpList.addAll(mpList);
}
When you want to update list or want to add one more item in your listview, use below code:
public void FillList() {
Geocoder geocoder = new Geocoder(activity, Locale.getDefault());
List<Address> addresses;
StepModel stp = null;
List<StepModel> Step = new ArrayList<>();
if (check < userPointList.size()) {
try {
addresses = geocoder.getFromLocation(userPointList.get(check).getLat(), userPointList.get(check).getLng(), 1);
stp = new StepModel();
stp.setsCity(addresses.get(0).getAdminArea());
stp.setsStreet(addresses.get(0).getThoroughfare());
stp.setSlat(userPointList.get(check).getLat());
stp.setSlng(userPointList.get(check).getLng());
stp.setSdate(userPointList.get(check).getDate());
stp.setStime(userPointList.get(check).getTime());
stp.setsCounts(userPointList.get(check).getCounts());
stp.setSprofilePhoto(userPointList.get(check).getProfilePhoto());
stp.setsUserCode(userPointList.get(check).getUserCode());
Step.add(stp);
} catch (IOException e) {
e.printStackTrace();
}
// Just update your list and call notifyDataSetChanged()
pointAdapter .reloadList(Step);
pointAdapter .notifyDataSetChanged();
check++;
}else {
return;
}
}
Initialize your adapter as below:
ArrayList<StepModel> userCodeList = new ArrayList<StepModel>();
pointAdapter = new PointsList_Adapter(userCodeList , activity) ;
Thank You.
After retrieving all data from server at once, inside Filllist() method you should use for, while or do..while loops to iterate your code.You have used if conditional loop that will run only once.
Else, you can create a method inside adapter to add item to your list and then call notifydatasetchanged() method there.
public void add(Object obj){
mArraylist.add(obj);
notifyDataSetChanged();
}
I've this adapter class :
public class NoteFeedListAdapter extends RecyclerView.Adapter<feedItemsHolder>{
private Activity activity;
private LayoutInflater inflater;
private List<NoteFeedItem> feedItems;
private List<CommentModel> commentItems;
private NoteCommentListAdapter adapter;
private RecyclerView mRecyclerView;
ImageLoader imageLoader = NoteAppController.getInstance().getImageLoader();
private static final String URL_LIST_VIEW_COMMENT = "http://url.com";
private int level = 0;
private Context mContext;
public NoteFeedListAdapter(Context context, List<NoteFeedItem> feedItems) {
this.feedItems = feedItems;
this.mContext = context;
}
public feedItemsHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.feed_item, null);
feedItemsHolder mh = new feedItemsHolder(v);
return mh;
}
public void onBindViewHolder(final feedItemsHolder fItemsHolder, final int i) {
final NoteFeedItem item = feedItems.get(i);
fItemsHolder.setLevel(item.getLevel());
if (item.getName2() != null) {
fItemsHolder.mHiddenComment.setText(item.getName2()+": "+item.getComment2());
fItemsHolder.feedImageView.setVisibility(View.VISIBLE);
and Inside onBindViewHolder :
int jComment = Integer.parseInt(item.getJumlahComment().toString());
if( jComment > 0){
fItemsHolder.mHiddenComment.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//this code is what I used to call asyntask but result from asynctask cannot be shown in this adapter
commentItems = new ArrayList<CommentModel>();
adapter = new NoteCommentListAdapter(mContext, commentItems);
mRecyclerView = new RecyclerView(mContext);
getListViewComments(item.getUserid(), item.getId(),fItemsHolder,i, commentItems, adapter, mRecyclerView);
commentItems = new ArrayList<CommentModel>();
adapter = new NoteCommentListAdapter(mContext, commentItems);
mRecyclerView.setAdapter(adapter);
}
});
}
...
} else {
fItemsHolder.mHiddenComment.setVisibility(View.GONE);
fItemsHolder.mLinearHiddenComment.setVisibility(View.GONE);
}
if(item.getLevel() == Level.LEVEL_ONE){
level = Level.LEVEL_TWO;
}else if(item.getLevel() == Level.LEVEL_TWO){
level = Level.LEVEL_THREE;
}
}
public int getItemCount() {
return (null != feedItems ? feedItems.size() : 0);
}
private void getListViewComments(final String userid, String id_note,final feedItemsHolder feedItemsHolder, int i, final List<CommentModel> commentItems, final NoteCommentListAdapter adapter, final RecyclerView mRecyclerView) {
class ambilComment extends AsyncTask<String, Void, String> {
ProgressDialog loading;
com.android.personal.asynctask.profileSaveDescription profileSaveDescription = new profileSaveDescription();
String result = "";
InputStream inputStream = null;
#Override
protected void onPreExecute() {
feedItemsHolder.mLoading.setVisibility(View.GONE);
feedItemsHolder.mHiddenComment.setVisibility(View.GONE);
feedItemsHolder.mLinearHiddenComment.setVisibility(View.GONE);
feedItemsHolder.mLoading.setVisibility(View.VISIBLE);
super.onPreExecute();
}
#Override
protected String doInBackground(String... params) {
HashMap<String, String> data = new HashMap<String,String>();
data.put("userid", params[0]);
data.put("id_note", params[1]);
String result = profileSaveDescription.sendPostRequest(URL_LIST_VIEW_COMMENT,data);
return result;
}
protected void onPostExecute(String s) {
JSONArray dataJsonArr = null;
if(s.equals(null)){
Toast.makeText(mContext, "Internet Problem.", Toast.LENGTH_SHORT).show();
}else{
try{
JSONObject json = new JSONObject(s);
String id_note = json.getString("id_note");
Toast.makeText(mContext, id_note, Toast.LENGTH_SHORT).show();
dataJsonArr = json.getJSONArray("data");
for (int i = 0; i < dataJsonArr.length(); i++) {
JSONObject c = dataJsonArr.getJSONObject(i);
String id_comment = c.getString("id_comment");
String uid = c.getString("userid");
String profile_name = c.getString("profile_name");
String profile_photo = c.getString("profile_photo");
String amount_of_like = c.getString("amount_of_like");
String amount_of_dislike = c.getString("amount_of_dislike");
String amount_of_comment = c.getString("amount_of_comment");
String content_comment = c.getString("content_comment");
String tgl_comment = c.getString("tgl_comment");
String parent_id = c.getString("parent_id");
CommentModel citem = new CommentModel();
citem.setId_note(id_note);
citem.setId_comment(id_comment);
citem.setUserid(uid);
citem.setProfileName(profile_name);
String pPhoto = c.isNull("profile_photo") ? null : c.getString("profile_photo");
citem.setProfile_photo(pPhoto);
citem.setJumlahLove(amount_of_like);
citem.setJumlahNix(amount_of_dislike);
citem.setJumlahComment(amount_of_comment);
citem.setContent_comment(content_comment);
citem.setTimeStamp(tgl_comment);
String prntID = c.isNull("parent_id") ? null : c.getString("parent_id");
citem.setParent_id(prntID);
citem.setLevel(level);
commentItems.add(citem);
}
adapter.notifyDataSetChanged();
}catch(JSONException e){
e.printStackTrace();
Log.w("getListNotesComment", "exception");
}
}
/* iH.mHiddenComment.setText("");*/
}
}
ambilComment ru = new ambilComment();
ru.execute(userid, id_note);
}
The problem is that I wanna add data from Asynctask and shown on another adapter. But how can i do that? please help. view from another adapter couldn't show with this code.