I have a REST Service that paginate my requests... I need to insert on my recyclerview 20 itens and keep the 20 itens before loaded.
This is my request...
VeiculoRequestHelper.veiculosPaginatedRequest(Request.Method.GET, url, null, new Response.Listener<VeiculoPaginated>() {
#Override
public void onResponse(VeiculoPaginated response) {
AnalyticsTracker.getInstance().sendEvent(AnalyticsEnum.Category.MY_VEHICLE, AnalyticsEnum.Action.CLICK, AnalyticsEnum.Label.SUCCESS);
isLast = response.isLast();
ArrayList<Veiculo> veiculoArrayList = new ArrayList<>();
veiculoArrayList.addAll(response.getContent());
veiculos = veiculoArrayList;
mAdapter.addItem(veiculos);
mRecyclerView.setAdapter(mAdapter);
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
AnalyticsTracker.getInstance().sendEvent(AnalyticsEnum.Category.MY_VEHICLE, AnalyticsEnum.Action.CLICK, AnalyticsEnum.Label.ERROR);
Toast.makeText(getActivity(), "Erro ao realizar listagem de veículos.", Toast.LENGTH_LONG).show();
}
});
This is my adapter method to add new itens...
public void addItem(ArrayList<Veiculo> veiculosArray) {
if (veiculos != null) {
veiculos.clear();
veiculos.addAll(veiculosArray);
notifyItemInserted(veiculos.size() - 1);
} else {
veiculos = veiculosArray;
}
notifyDataSetChanged();
}
What i'm doing wrong? The itens is inserted but not keeping the old itens... Help please!
The old data will be cleared in addItem(ArrayList<Veiculo> veiculosArray):
if (veiculos != null) {
veiculos.clear(); // here they will be cleared
veiculos.addAll(veiculosArray);
notifyItemInserted(veiculos.size() - 1);
}
Remove this line to keep the old items.
in your onResponse:
ArrayList<Veiculo> veiculoArrayList = new ArrayList<>();
veiculoArrayList.addAll(response.getContent());
veiculos = veiculoArrayList;
mAdapter.addItem(veiculos);
mRecyclerView.setAdapter(mAdapter);
see what is happening, veiculoArrayList is being assigned to veiculos means new 20 items are now in it.
passing veiculos into mAdapter.addItem(veiculos);
and in your addItem method
veiculos.clear();
veiculos.addAll(veiculosArray);
means what ever was in veiculos will clear and new list veiculosArray would be added in it (means new 20 items). You just don't need to clear, add new items list and notifyDatasetChanged().
to keep focus on last item, you just need to set recyclerView.smoothScrollToPosition(position);
and obviously position would be veiculos.size() before adding new items into it.
notifyItemRangeInserted(lastListSize, newList.size());
Related
When I search for a user in my database, it populates the RecyclerView, but when I make another search, and it can't find the user, I want it to also remove the RecyclerView content, but the old users content stays in the RecyclerView until I search for an existing user, then it changes to the new users content.
#OnClick(R.id.btn_search_user)
public void onSearchBtnClicked(View view) {
Log.e(LOG_TAG, "Search button clicked");
if (!TextUtils.isEmpty(etSearchUser.getText())) {
userNameSearch = etSearchUser.getText().toString();
if (!isNetworkAvailable()) {
Toast.makeText(this, "No internet, searching offline", Toast.LENGTH_SHORT).show();
mOwner = Owner.getByUsername(userNameSearch);
if(mOwner != null) {
searchUserByUserName(userNameSearch);
} else {
// I want the RecyclerView to be empty at this point.
tvGitHubUser.setText("was not found offline");
}
} else {
loadRepository(userNameSearch);
Log.e(LOG_TAG, "Owner is empty, searching online");
}
}
}
initRecycleView()
mGithubRecyclerView = (RecyclerView) findViewById(R.id.github_repository_recyclerview);
RecyclerView.LayoutManager mGithubLayoutManager = new LinearLayoutManager(getApplicationContext());
mGithubRecyclerView.setLayoutManager(mGithubLayoutManager);
mGithubRecyclerView.setHasFixedSize(true);
Simply, call recyclerView.setAdapter(null);
If you can show me your adapter code, I can provide better method.
When a button is pressed, a dialog appears asking user for message, with the option of attaching an image (from url). The problem I'm having is once the recyclerview is filled with enough items to scroll, when the user scrolls quickly for some reason random images start popping up in seemingly random list items.
I know the problem has to come from when the image is actually placed into the imageview, since I can tell the link is added to the firebase db just fine.
When the image link is submitted, it's sent to /posts/$uid/$post-id in a HashMap. Kind of like this:
final Map<String, String> postMap = new HashMap<String, String>();
imagebutton.setOnClickListener((view) -> {
AlertDialog.Builder = new...
LayoutInflater in = ...
View dialogLayout = ...inflate(r.layout...., null);
build.setView(dialogLayout);
EditText imgText = ...
Button submit = ...
AlertDialog a = build.create();
submit.setOnClickListener((View) -> {
...
postMap.put("imgLink", imgText.getText().toString());
a.dismiss();
...
urlDialog.show();
Then a few more items are added to the map and pushed to firebase.
Firebase postRef = ref.child("posts").child(auth.getUid());
postMap.put("author", ...);
postMap.put("content", ...);
postRef.push().setValue(postMap);
But like I said, I'm almost 100% sure the problem is not in posting the information, just populating the recview
Here's my code for the list itself:
RecyclerView feed = (RecyclerView)findViewById(R.id.recycler);
if (ref.getAuth() != null) {
FirebaseRecyclerAdapter<TextPost, PostViewHolder> adapter = new FirebaseRecyclerAdapter<TextPost, PostViewHolder>(TextPost.class, R.layout.list_item, PostViewHolder.class, ref.child("posts").child(uid)) {
#Override
protected void populateViewHolder(final PostViewHolder postViewHolder, final TextPost textPost, int i) {
postViewHolder.content.setText(textPost.getContent());
postViewHolder.author.setText(textPost.getAuthor());
postViewHolder.score.setText(textPost.getScore());
postViewHolder.time.setText(textPost.getTime());
if (textPost.getImgLink() != null && !textPost.getImgLink().equals("")) {
Log.i(TAG, "Setting image");
new Thread(new Runnable() {
#Override
public void run() {
try {
final Bitmap pic = bitmapFromUrl(textPost.getImgLink());
postViewHolder.img.post(new Runnable() {
#Override
public void run() {
postViewHolder.img.setImageBitmap(pic);
}
});
} catch (Exception e) {
e.printStackTrace();
}
}
}).start();
}
...
feed.setAdapter(adapter);
I just started learning how to work with worker threads for network activities off the main UI thread so I assume I messed that up? I've gone through the logic over and over in my head and i can't seem to figure out what's going wrong here.
EDIT: I tried using AsyncTask instead of Threads and the problem persists. sos
All I had to do was set the ImageView drawable to null before populating the ImageView.
Like this:
#Override
protected void populateViewHolder(final ViewHolder v, final Object o, int i) {
//populate views
v.content.setText("...");
//Set imageview to null
v.imageview.setImageDrawable(null);*
if (o.getImageLink() != null && !o.getImageLink.equals("")) {
// Start AsyncTask to get image from link and populate imageview
new DownloadImageTask().execute(o.getImgLink(), v.imageview);
}
}
I am getting data (List) from an API and I am trying to update my AutcompleteTextView with this data.
This is how I currently do :
I have a TextWatcher which calls a the method to get the data in afterTextChanged, so every time the user stops typing the method is called, and the adapter is notified with ``notifyDataSetChanged :
//in onCreate
addressAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_dropdown_item_1line,suggestions_address);
at_address.setAdapter(addressAdapter);
...
#Override
public void afterTextChanged(Editable s) {
autoComplete(s);
addressAdapter.notifyDataSetChanged();
//suggestions_address is the updated list, and when I print it I can see the
//results so it is not empty
Log.i("addresses",suggestions_address.toString());
}
...
class SuggestionQueryListener implements ResultListener<List<String>> {
#Override
public void onCompleted(List<String> data, ErrorCode error) {
if (error != ErrorCode.NONE) {
Toast.makeText(MainActivity2.this,error.toString(),Toast.LENGTH_LONG).show();
} else {
suggestions_address.clear();
for(int i = 0;i<data.size();i++){
suggestions_address.add(data.get(i));
}
}
}
}
public void autoComplete(CharSequence s) {
try {
String term = s.toString();
TextSuggestionRequest request = null;
request = new TextSuggestionRequest(term).setSearchCenter(new GeoCoordinate(48.844900, 2.395658));
request.execute(new SuggestionQueryListener());
if (request.execute(new SuggestionQueryListener()) != ErrorCode.NONE) {
//Handle request error
//...
}
} catch (IllegalArgumentException ex) {
//
}
}
But it seems that the adapter is not really updated because it doesn't show the suggestions when I type something.
Also, before doing this with an AutoCompleteTextView I did it with a listView, with the same process, and everything worked well.
Any ideas or solutions would be really appreciated
EDIT : I noticed something really strange : the data is not binded to the adapter, because adapter#getCount always returns 0, even if the list is not empty. But when I remove at_address.setAdapter(addressAdapter), the data adapter is updated and adapter#getCount returns the right number of elements.
I am really confused right now, please help !
Instead of this:
for(int i = 0;i<data.size();i++){
suggestions_address.add(data.get(i));
}
you can use just this:
suggestions_address.addAll(data);
you are calling notifyDataSetChanged after you start the request, you should call it after you get the result and update the suggestions_address, so call notifyDataSetChanged inside onCompleted
At the beginning of the chat app user see a list off groups (listview group) available and the user have the possibility to create a new group or click on some off the available groups and then start to write messages (listview messages). The functions CreateNewMessage and CreateNewGroup pushes information to firebase correctly
Above scenarios works finne problems arise when user navigates backwards (popBackStack()) from listview with messages to GroupFragment, here should user be presented a list off available groups but the listview is empty. The ReadGroupData() function is not reading the already created groups from firebase and inserts them in the group listview. How to make this happen?
GroupFragment:
public void ReadGroupData() {
Firebase firebaserootRef = new Firebase("https://000.firebaseio.com");
firebaserootRef.addChildEventListener(new ChildEventListener() {
#Override
public void onChildAdded(DataSnapshot snapshot, String s) {
if (snapshot.getValue() != null) {
Group newGroup = new Group((String)snapshot.child("name").getValue(),
(String) snapshot.child("id").getValue());
if(!groupKeyValues.contains(newGroup.GetId())) {
groupKeyValues.add(newGroup.GetId());
AddToLstViewGroup(newGroup);
System.out.println("Read group data from firebase and
inserted in listView");
}
}
}
});
}
public void AddToLstViewGroup(Group newGroup) {
groupNameList.add(newGroup);
if(groupAdapter == null) {
groupAdapter = new GroupAdapter(getActivity(), groupNameList);
}
if (lstViewGroup == null) {
lstViewGroup = (ListView) getView().
findViewById(R.id.listView_group);
}
lstViewGroup.setOnItemClickListener(onItemClickListener);
lstViewGroup.setOnItemLongClickListener(onItemLongClickListener);
groupAdapter.notifyDataSetChanged();
lstViewGroup.setAdapter(groupAdapter);
}
ChatFragment:
public void ReadChatMessages(Firebase firebaseRootRef) {
firebaseRootRef.addChildEventListener(new ChildEventListener() {
#Override
public void onChildAdded(DataSnapshot snapshot, String s) {
if (snapshot.child(GetGroupId()).child("messages").
getChildren() != null) {
for (DataSnapshot c :
snapshot.child(GetGroupId()).child("messages").getChildren()) {
String key = c.getKey();
Message newMessage = new Message();
newMessage.SetFrom((String) c.child("from").getValue());
newMessage.SetMsg((String)
c.child("message").getValue());
newMessage.SetTime((String) c.child("time").getValue());
newMessage.SetId((String) c.child("id").getValue());
if ((!msgKeyValues.contains(key)) ||
newMessage.GetFrom() != "") {
msgKeyValues.add(key);
AddToLstViewChat(newMessage);
//Automatic scrolls to last line in listView.
lstViewChat.setSelection(chatAdapter.getCount() -1);
}
}
}
}
public void AddToLstViewChat(Message newMessage) {
chatMsgList.add(newMessage);
if (chatAdapter == null) {
chatAdapter = new ChatAdapter(getActivity(), chatMsgList);
}
if(IsMsgFromMe(newMessage)) {
lstViewChat = (ListView)
getView().findViewById(R.id.listView_chat_message_me);
} else {
lstViewChat =
(ListView)getView().findViewById(R.id.listView_chat_message_others);
}
chatAdapter.notifyDataSetChanged();
lstViewChat.setAdapter(chatAdapter);
}
ChatActivity:
#Override
public void onBackPressed() {
if (getFragmentManager().getBackStackEntryCount() > 0) {
getFragmentManager().popBackStack();
} else {
finish();
}
}
For all the code click on the link: "http://pastebin.com/97nR68Rm"
SOLUTION!
Kato thank you for you patience and help. I have now found a solution for the problem. I'm calling ReadGroupData() and ReadChatMessages() at the end (before return) in my onCreateView methods. As Kato pointed out onCreate() is not getting called on popBackStack()
In my AddToLStViewGroup the if statement for lstViewGroup is deleted so now it always sets the listView otherwise it will throw an exception for not finding the correct view, To clarifying:
Deleted this line:
if (lstViewGroup == null) {
lstViewGroup = (ListView)getView().findViewById(R.id.listView_group);
}
And replaced with:
ListView lstViewGroup=(ListView)getView().findViewById(R.id.listView_group);
Kato thank you for you patience and help. I have now found a solution for the problem. I'm calling ReadGroupData() and ReadChatMessages() at the end (before return) in my onCreateView methods. As Kato pointed out onCreate() is not getting called on popBackStack()
In my AddToLStViewGroup the if statement for listViewGroup is deleted so now it always sets the listView otherwise it will throw an exception for not finding the correct view.
To clarify:
I deleted this line:
if (lstViewGroup == null) {
lstViewGroup = (ListView)getView().findViewById(R.id.listView_group);
}
And replaced it with:
ListView lstViewGroup =(ListView)getView().findViewById(R.id.listView_group);
(The original asker posted the answer as part of the question. I'm copying it here as a matter of housekeeping.)
I have this query located in my ParseQueryBuilder object:
public ParseQuery<Event> eventsTypes() {
ParseQuery<Event> query = Event.getQuery();
query.setCachePolicy(ParseQuery.CachePolicy.CACHE_ELSE_NETWORK);
query.setMaxCacheAge(TimeUnit.DAYS.toMillis(1));
query.whereEqualTo(Event.owner, parse.getParseUser());
query.orderByDescending(Event.timesUsed);
return query;
}
I use it to populate a ParseQueryAdapter
and at some point I would like to add an Event and immediately show it:
#OnClick(R.id.add)
public void add(Button button) {
final Event new_type = new Event();
new_type.setOwner(parse.getParseUser());
new_type.setName("atest");
new_type.saveEventually(new SaveCallback() {
#Override
public void done(ParseException e) {
if (e == null) {
// on successfull save, clear cache
parseQueryBuilder.eventsTypes().clearCachedResult();
// and show newly added object
mAdapter.loadObjects();
Toast.makeText(getActivity(), new_type.getName(), Toast.LENGTH_SHORT).show();
}
}
});
}
I expected clearing the cache would result in a new network query, revealing the newly added item but no matter what I try, it seems it will only show the initially cached result.
Even if I try to restart my app, it shows the result from the first cache.