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I want to get the qna list through firebase, but I can't get the list

This is a list of qna in the firebase. I want to print this out.
But my output list doesn't show anything.
https://i.stack.imgur.com/6ctRB.png
QNA Activity
public class QnaActivity extends AppCompatActivity {
private RecyclerView qnaRv;
private ArrayList<ModelQna> qnaList;
private AdapterQna adapterQna;
private ImageButton writeBtn;
private ImageButton backbtn;
private TextView tabQnaTv;
private RelativeLayout QnaRl;
private FirebaseAuth firebaseAuth;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_qna);
getSupportActionBar().hide();
qnaRv = findViewById(R.id.qnaRv);
tabQnaTv = findViewById(R.id.tabQnaTv);
QnaRl = findViewById(R.id.QnaRl);
backbtn = findViewById(R.id.backBtn);
writeBtn = findViewById(R.id.writeBtn);
firebaseAuth = FirebaseAuth.getInstance();
loadAllQna();
showQnaUI();
backbtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
onBackPressed();
}
});
writeBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(getApplicationContext(), AddQnaActivity.class);
startActivity(intent);
}
});
tabQnaTv.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//load products
}
});
}
private void loadAllQna() {
qnaList = new ArrayList<>();
adapterQna = new AdapterQna(this, qnaList);
qnaRv.setAdapter(adapterQna);
//get all products
DatabaseReference reference = FirebaseDatabase.getInstance().getReference("Employees");
reference.child(firebaseAuth.getUid()).child("Qna").addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot snapshot) {
//before getting reset List
qnaList.clear();
for (DataSnapshot dataSnapshot : snapshot.getChildren()){
ModelQna modelQna = dataSnapshot.getValue(ModelQna.class);
qnaList.add(modelQna);
}
}
#Override
public void onCancelled(#NonNull DatabaseError databaseerror) {
}
});
}
private void showQnaUI() {
//show orders ui and hide products ui
QnaRl.setVisibility(View.GONE);
}
}
Model
public class ModelFaq {
private String faqId,faqTitle,faqContent, timestamp,uid,faqCategory;
public ModelFaq() {
}
public ModelFaq(String faqId, String faqTitle, String faqContent, String timestamp, String uid, String faqCategory) {
this.faqId = faqId;
this.faqTitle = faqTitle;
this.faqContent = faqContent;
this.timestamp = timestamp;
this.uid = uid;
this.faqCategory = faqCategory;
}
public String getFaqId() {
return faqId;
}
public void setFaqId(String faqId) {
this.faqId = faqId;
}
public String getFaqTitle() {
return faqTitle;
}
public void setFaqTitle(String faqTitle) {
this.faqTitle = faqTitle;
}
public String getFaqContent() {
return faqContent;
}
public void setFaqContent(String faqContent) {
this.faqContent = faqContent;
}
public String getTimestamp() {
return timestamp;
}
public void setTimestamp(String timestamp) {
this.timestamp = timestamp;
}
public String getUid() {
return uid;
}
public void setUid(String uid) {
this.uid = uid;
}
public String getFaqCategory() {
return faqCategory;
}
public void setFaqCategory(String faqCategory) {
this.faqCategory = faqCategory;
}
}
Qna Adapter
public class AdapterQna extends RecyclerView.Adapter<AdapterQna.HolderQna> {
private Context context;
public ArrayList<ModelQna> qnaList;
public AdapterQna(Context context, ArrayList<ModelQna> qnaList) {
this.context = context ;
this.qnaList = qnaList ;
}
#NonNull
#Override
public HolderQna onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
//inflate layout
View view = LayoutInflater.from(context).inflate(R.layout.qna_item, parent, false);
return new HolderQna(view);
}
#Override
public void onBindViewHolder(#NonNull HolderQna holder, int position) {
ModelQna modelQna = qnaList.get(position);
String id = modelQna.getQnaId();
String uid = modelQna.getUid();
String qnaContent = modelQna.getQnaContent();
String qnaTitle = modelQna.getQnaTitle();
String timestamp = modelQna.getTimestamp();
//set data
holder.titleTextView.setText(qnaTitle);
holder.ContentTextView.setText(qnaContent);
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//handle item clicks, show item details
}
});
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//handle item clicks, show item details
}
});
}
#Override
public int getItemCount() {
return qnaList.size();
}
class HolderQna extends RecyclerView.ViewHolder{
/*holds views of recyclerview*/
private TextView titleTextView, ContentTextView;
public HolderQna(#NonNull View itemView) {
super(itemView);
titleTextView = itemView.findViewById(R.id.item_post_title);
ContentTextView = itemView.findViewById(R.id.item_post_content);
}
}
}

Can you please change the code in your HolderQna to:
class HolderQna extends RecyclerView.ViewHolder{
/*holds views of recyclerview*/
private TextView titleTextView, ContentTextView;
public HolderQna(#NonNull View itemView) {
super(itemView);
titleTextView = itemView.findViewById(R.id.item_post_title);
ContentTextView = itemView.findViewById(R.id.item_post_content);
}
public void bind(qna: ModelQna){
titleTextView.setText(qna.qnaTitle);
ContentTextView.setText(qna.qnaContent);
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//handle item clicks, show item details
}
});
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//handle item clicks, show item details
}
});
}
}
And your onBindViewHolder override of the AdapterQna to:
#Override
public void onBindViewHolder(#NonNull HolderQna holder, int position) {
ModelQna modelQna = qnaList.get(position);
String id = modelQna.getQnaId();
String uid = modelQna.getUid();
String qnaContent = modelQna.getQnaContent();
String qnaTitle = modelQna.getQnaTitle();
String timestamp = modelQna.getTimestamp();
//set data
holder.bind(modelQna);
}
Finally change your loadQna() function declaration as follows:
private void loadAllQna() {
qnaList = new ArrayList<>();
//get all products
DatabaseReference reference = FirebaseDatabase.getInstance().getReference("Employees");
reference.child(firebaseAuth.getUid()).child("Qna").addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot snapshot) {
//before getting reset List
qnaList.clear();
for (DataSnapshot dataSnapshot : snapshot.getChildren()){
ModelQna modelQna = dataSnapshot.getValue(ModelQna.class);
qnaList.add(modelQna);
}
adapterQna = new AdapterQna(this, qnaList);
qnaRv.setAdapter(adapterQna);
}
#Override
public void onCancelled(#NonNull DatabaseError databaseerror) {
Log.e("QnaActivity", databaseError.toString());
}
});
}

As far as I can see in your screenshot, the Qna node it's not nested under any UID, but directly under the Employees node. So when you attach a listener to the following node:
DatabaseReference reference = FirebaseDatabase.getInstance().getReference("Employees");
reference.child(firebaseAuth.getUid()).child("Qna").addValueEventListener(/*...*/);
You will not be able to get any results, because such a reference doesn't exist. To solve this, you either create a reference that points exactly to "Qna":
DatabaseReference db = FirebaseDatabase.getInstance().getReference();
DatabaseReference qnaRef = db.child("Employees").child("Qna");
qnaRef.addValueEventListener(/*...*/);
Or you move the "Qna" node under the UID of the user, and leave the code unchanged.
Besides that, there is also another problem. The name of the fields in your ModelFaq class are different than the name of the properties in your database. You have in your ModelFaq class four fields called faqId, faqTitle, faqContent, faqCategory, all starting with faq while in the database I see that the names are different, qnaId, qnaTitle, qnaContent, qnaCategory, all are starting wiht qna, and this is not correct. So in order to be able to map a node into an object of type ModelFaq, the names must match. The only two fields that match are the timestamp and the uid.
In this case, you have two solutions. The first one would to change the name of your fieds in the ModelFaq class according to what it already exists in the database or you can use the PropertyName annotation in front of the getters like this:
#PropertyName("qnaId")
public String getFaqId() {
return faqId;
}

I have this error : "Can't convert object of type java.lang.String to type com.flashpub.flash.imageSection" and i don't know why

I've created a listView, and since i'm opening one of the item, the application need to fetch all image of the application, but it's doesn't work, i can't figure it out why that's showing me this error.
Thank you for helping !
That's my model on Firebase :
imageSection.java
package com.flashpub.flash;
import java.util.List;
public class imageSection {
String imageUrl;
public imageSection(){
}
public imageSection(String imageUrl) {
this.imageUrl = imageUrl;
}
public String getImageUrl() {
return imageUrl;
}
}
chooseSection.java
package com.flashpub.flash;
import java.util.List;
public class chooseSection {
String sectionn;
public chooseSection() {
}
public chooseSection(String sectionn) {
this.sectionn = sectionn;
}
public String getSectionn() {
return sectionn;
}
}
chooseSectionActivity.java
public class ChooseSectionActivity extends AppCompatActivity {
ListView listView;
FirebaseListAdapter<chooseSection> adapter;
chooseSection sectionChosse;
//private HashMap<Integer, String> allItemsList = new HashMap<Integer, String>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_choose_section);
listView = findViewById(R.id.listView);
FirebaseDatabase.getInstance().setPersistenceEnabled(true);
FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference myRef = database.getReference();
myRef.keepSynced(true);
Query query = FirebaseDatabase.getInstance().getReference().child("Sections");
Log.i("salut", query.toString());
FirebaseListOptions<chooseSection> options = new FirebaseListOptions.Builder<chooseSection>()
.setLayout(R.layout.section_list)
.setQuery(query,chooseSection.class)
.build();
adapter = new FirebaseListAdapter<chooseSection>(options) {
#Override
protected void populateView(#NonNull View view, #NonNull chooseSection model, int position) {
TextView sectionView = (TextView) view.findViewById(R.id.sectionView);
sectionView.setText(model.getSectionn());
chooseSection lu = sectionChosse;
//String LatLng = lu.getLocationUserLatitude() + "," + lu.getLocationUserLongitude();
//allItemsList.put(position, model.getSectionn());
}
};
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//String item = allItemsList.get(position);
Intent intent = new Intent(ChooseSectionActivity.this, PubsSectionActivity.class);
//intent.putExtra("key", item);
startActivity(intent);
}
});
listView.setAdapter(adapter);
}
#Override
protected void onStart() {
super.onStart();
adapter.startListening();
}
#Override
protected void onStop() {
super.onStop();
adapter.stopListening();
}
}
PubsSectionActivity.java
public class PubsSectionActivity extends AppCompatActivity {
ViewFlipper viewFlipp;
private DatabaseReference databaseReference;
private List<imageSection> slideLists;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pubs_section);
viewFlipp = findViewById(R.id.viewFlipper);
databaseReference = FirebaseDatabase.getInstance().getReference();
slideLists = new ArrayList<>();
}
#Override
protected void onStart() {
super.onStart();
usingFirebaseDatabase();
}
private void usingFirebaseDatabase() {
String lolipop = "Coiffeur";
databaseReference.child("Sections/Restaurant")
.addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.exists()) {
slideLists.clear();
for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
imageSection model = snapshot.getValue(imageSection.class);
slideLists.add(model);
}
Toast.makeText(PubsSectionActivity.this, "All data fetched", Toast.LENGTH_SHORT).show();
usingFirebaseImages(slideLists);
} else {
Toast.makeText(PubsSectionActivity.this, "No images in firebase", Toast.LENGTH_SHORT).show();
}
}
#Override
public void onCancelled(DatabaseError databaseError) {
Toast.makeText(PubsSectionActivity.this, "NO images found \n" + databaseError.getMessage(), Toast.LENGTH_SHORT).show();
}
});
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
}
private void usingFirebaseImages(List<imageSection> slideLists) {
for (int i = 0; i < slideLists.size(); i++) {
String downloadImageUrl = slideLists.get(i).getImageUrl();
Toast.makeText(this, downloadImageUrl, Toast.LENGTH_LONG).show();
ImageView imageView = new ImageView(this);
Picasso.get().load(downloadImageUrl).fit().centerCrop().into(imageView);
viewFlipp.addView(imageView);
viewFlipp.setInAnimation(this, android.R.anim.slide_in_left);
viewFlipp.setOutAnimation(this, android.R.anim.slide_out_right);
}
}
}
Help me please, i'm stuck !!
i don't know why there is this error...

You're attaching a listener to Sections/Restaurant. Since that is one specific restaurant, you don't need to loop over the children in onDataChange.
So:
databaseReference.child("Sections/Restaurant")
.addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.exists()) {
slideLists.clear();
imageSection model = snapshot.getValue(imageSection.class);
slideLists.add(model);
Toast.makeText(PubsSectionActivity.this, "All data fetched", Toast.LENGTH_SHORT).show();
usingFirebaseImages(slideLists);
} else {
Toast.makeText(PubsSectionActivity.this, "No images in firebase", Toast.LENGTH_SHORT).show();
}
}

Recyclerview's Onscroll is not working while fetching data from firebase

I want to add onScroll Listener, but recyclerview's addonScrollListner() method is not doing anything, I want to fetch next ten items on every recyclerview's scroll.
At first time the data is fetching fine, but when i am scrolling recyclerview then nothing is happening, i am not able to find out why is this happening.
It is my code:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_content);
MobileAds.initialize(this, new OnInitializationCompleteListener() {
#Override
public void onInitializationComplete(InitializationStatus initializationStatus) {
}
});
mAdView = findViewById(R.id.adView_con);
progressBar = findViewById(R.id.contentprogressbar);
AdRequest adRequest = new AdRequest.Builder().build();
mAdView.loadAd(adRequest);
recyclerView = findViewById(R.id.listview);
mSwipeRefreshLayout = findViewById(R.id.swipeContainer);
textView = findViewById(R.id.emptylist);
backbtncontent = findViewById(R.id.backbtncntent);
backbtncontent.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(ContentActivity.this, HomeActivity.class);
startActivity(i);
}
});
classname = getIntent().getStringExtra("classname");
if (classname.equals("A")) {
content = getIntent().getStringExtra("jokecontent");
} else if (classname.equals("B")) {
content = getIntent().getStringExtra("shayaricontent");
}
getLastKeyFromFirebase();
final LinearLayoutManager layoutManager= new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(recyclerView.getContext(), layoutManager.getOrientation());
recyclerView.addItemDecoration(dividerItemDecoration);
arrayAdapter = new NewAdapterContent(contentname,this);
recyclerView.setAdapter(arrayAdapter);
getUsers();
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrolled(#NonNull RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
total_item = layoutManager.getItemCount();
last_visible_item = layoutManager.findLastCompletelyVisibleItemPosition();
if(!isLoading && total_item<=((last_visible_item+ITEM_LOAD_COUNT))){
getUsers();
isLoading = true;
}
}
});
}
private void getUsers()
{
if (!isMaxData) {
Query query;
if (classname.equals("A")) {
if (TextUtils.isEmpty(last_nodes)) //wait content to aa n raehre
query = FirebaseDatabase.getInstance().getReference("ContentJokes")
.orderByChild("subcategory")
.equalTo(content)
.limitToFirst(ITEM_LOAD_COUNT);
else
query = FirebaseDatabase.getInstance().getReference("ContentJokes")
.orderByChild("subcategory")
//.equalTo(content)
.startAt(last_nodes)
.limitToFirst(ITEM_LOAD_COUNT);
//1 sec wait cll ari kisi ki
query.addChildEventListener(new ChildEventListener() {
#Override
public void onChildAdded(#NonNull DataSnapshot dataSnapshot, #Nullable String s) {
if (!dataSnapshot.exists()) {
//hello ?
isLoading = false;
isMaxData = true;
// progressBar.setVisibility(View.GONE);
Toast.makeText(ContentActivity.this, "There is no jokes present under this category", Toast.LENGTH_SHORT).show();
} else {
String contentdisplay = dataSnapshot.child("content").getValue(String.class);
String key = dataSnapshot.child("content").getKey();
ContentModel contentModel = new ContentModel(contentdisplay, key);
contentname.add(0, contentModel);
arrayAdapter.notifyDataSetChanged();
progressBar.setVisibility(View.GONE);
arrayAdapter.notifyItemInserted(0);
last_nodes = contentname.get(contentname.size() - 1).getId();
if (!last_nodes.equals(last_key)) {
} else
last_nodes = last_key;
isLoading = false;
}
}
#Override
public void onChildChanged(#NonNull DataSnapshot dataSnapshot, #Nullable String s) {
}
#Override
public void onChildRemoved(#NonNull DataSnapshot dataSnapshot) {
}
#Override
public void onChildMoved(#NonNull DataSnapshot dataSnapshot, #Nullable String s) {
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
}
});
} else if(classname.equals("B")){
if (TextUtils.isEmpty(last_nodes)) //wait content to aa n raehre
query = FirebaseDatabase.getInstance().getReference("ContentShayari")
.orderByChild("subcategory")
.equalTo(content)
.limitToFirst(ITEM_LOAD_COUNT);
else
query = FirebaseDatabase.getInstance().getReference("ContentShayari")
.orderByChild("subcategory")
.equalTo(content)
.startAt(last_nodes)
.limitToFirst(ITEM_LOAD_COUNT);
query.addChildEventListener(new ChildEventListener() {
#Override
public void onChildAdded(#NonNull DataSnapshot dataSnapshot, #Nullable String s) {
if (!dataSnapshot.exists()) {
isLoading = false;
isMaxData = true;
// progressBar.setVisibility(View.GONE);
Toast.makeText(ContentActivity.this, "There is no jokes present under this category", Toast.LENGTH_SHORT).show();
} else {
String contentdisplay = dataSnapshot.child("content").getValue(String.class);
String key = dataSnapshot.child("content").getKey();
ContentModel contentModel = new ContentModel(contentdisplay, key);
contentname.add(0, contentModel);
arrayAdapter.notifyDataSetChanged();
// progressBar.setVisibility(View.GONE);
arrayAdapter.notifyItemInserted(0);
last_nodes = contentname.get(contentname.size() - 1).getId();
if (!last_nodes.equals(last_key)) {
} else
last_nodes = last_key;
isLoading = false;
}
}
#Override
public void onChildChanged(#NonNull DataSnapshot dataSnapshot, #Nullable String s) {
}
#Override
public void onChildRemoved(#NonNull DataSnapshot dataSnapshot) {
}
#Override
public void onChildMoved(#NonNull DataSnapshot dataSnapshot, #Nullable String s) {
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
}
});
}
}
}
private void getLastKeyFromFirebase() {
Query getLastKey;
if (classname.equals("A")) {
getLastKey = FirebaseDatabase.getInstance().getReference()
.child("ContentJokes")
.orderByChild("subcategory").equalTo(content)
.limitToLast(1);
getLastKey.addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
for (DataSnapshot lastKey : dataSnapshot.getChildren()) {
last_key = lastKey.getKey();
Toast.makeText(ContentActivity.this, String.valueOf(last_key), Toast.LENGTH_SHORT).show();
}
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
Toast.makeText(ContentActivity.this, "cannot get last key", Toast.LENGTH_SHORT).show();
}
});
} else if (classname.equals("B")) {
getLastKey = FirebaseDatabase.getInstance().getReference()
.child("ContentShayari")
.orderByChild("subcategory").equalTo(content)
.limitToLast(1);
getLastKey.addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
for (DataSnapshot lastKey : dataSnapshot.getChildren()) {
last_key = lastKey.getKey();
Toast.makeText(ContentActivity.this, String.valueOf(last_key), Toast.LENGTH_SHORT).show();
}
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
Toast.makeText(ContentActivity.this, "cannot get last key", Toast.LENGTH_SHORT).show();
}
});
}
}
RecyclerAdapter Code:
public class NewAdapterContent extends RecyclerView.Adapter<NewAdapterContent.ViewHolder> {
ArrayList<ContentModel>contentModels;
Context context;
public NewAdapterContent(ArrayList<ContentModel>contentModels, Context context) {
this.contentModels = contentModels;
this.context = context;
}
public void addAll(ArrayList<ContentModel>contentModels){
int initSize = contentModels.size();
contentModels.addAll(contentModels);
notifyItemRangeChanged(initSize, contentModels.size());
}
public String getLastItemId(){
return contentModels.get(contentModels.size()-1).getId();
}
#NonNull
#Override
public NewAdapterContent.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.content, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull NewAdapterContent.ViewHolder holder, int position) {
holder.textView.setText(contentModels.get(position).getContent());
}
#Override
public int getItemCount() {
return contentModels.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
TextView textView;
public ViewHolder(#NonNull View itemView) {
super(itemView);
textView = itemView.findViewById(R.id.contentText);
}
}
}
Anytime of help would be appreciated. Please help.

Try it which is very easy to use that was worked for me by using the custom RecyclerView.OnScrollListener named EndlessRecyclerViewScrollListener -
EndlessRecyclerViewScrollListener scrollListener = new
EndlessRecyclerViewScrollListener(layoutManager) {
#Override
public void onLoadMore(int page, int totalItemsCount, RecyclerView view) {
if(!isLoading){
getUsers();
isLoading = true;
}
}
};
recyclerView.addOnScrollListener(scrollListener);

How to remove item from firebase list

I use firebase database and recycler view.
I add a list of items to firebase using the push (); command.
While using push(); , firebase creating a unique id for each added item.
Now, i want delete item on click delete button, but when i try removeValue(); function to my DB ref, it delete the all repository and not just the item.
That what i have now:
Fragment that read data from firebase
users.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull final DataSnapshot dataSnapshot) {
notes.clear();
for (DataSnapshot dataSnapshot1 : dataSnapshot.getChildren()) {
note = dataSnapshot1.getValue(Note.class);
notes.add(note);
}
adapter = new NotesAdapter(notes, getActivity());
RecyclerView.LayoutManager layoutManager = new GridLayoutManager(getActivity(), 3);
RVNotesList.setLayoutManager(layoutManager);
RVNotesList.setAdapter(adapter);
adapter.setOnNoteClickListener(new NotesAdapter.OnNoteClickListener() {
#Override
public void onNoteClick(final int position) {
users.addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
//TODO delete pressed item.
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
}
});
}
});
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
}
});
My onClick buttons
#Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.saveNoteBTN:
String title = ETnoteTitle.getText().toString().trim();
String desc = ETnoteDesc.getText().toString().trim();
String date = ETnoteLastDate.getText().toString().trim();
if (title.isEmpty() || desc.isEmpty() || date.isEmpty()) {
return;
}
note = new Note(title, desc, date);
users.push().setValue(note).addOnSuccessListener(new OnSuccessListener<Void>() {
#Override
public void onSuccess(Void aVoid) {
Log.d("NoteAdded", "true");
getFragmentManager().beginTransaction().
remove(getFragmentManager().findFragmentById(R.id.bottom_container)).commit();
}
}).addOnFailureListener(new OnFailureListener() {
#Override
public void onFailure(#NonNull Exception e) {
Log.d("NoteAdded", "false");
}
});
break;
case R.id.deleteNoteBTN:
getFragmentManager().beginTransaction().
remove(getFragmentManager().findFragmentById(R.id.bottom_container)).commit();
break;
}
}
Adapter
package com.enjoyapp.eventmanagement.Adapters;
import android.app.Dialog;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.cardview.widget.CardView;
import androidx.recyclerview.widget.RecyclerView;
import com.enjoyapp.eventmanagement.Models.Note;
import com.enjoyapp.eventmanagement.R;
import java.util.ArrayList;
public class NotesAdapter extends RecyclerView.Adapter<NotesAdapter.NotesViewHolder> {
private ArrayList<Note> notes;
private Context context;
private OnNoteClickListener onNoteClickListener;
public NotesAdapter(ArrayList<Note> notes, Context context) {
this.notes = notes;
this.context = context;
}
public interface OnNoteClickListener {
void onNoteClick(int position);
}
public void setOnNoteClickListener(OnNoteClickListener onNoteClickListener) {
this.onNoteClickListener = onNoteClickListener;
}
#NonNull
#Override
public NotesViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.note_list_item, parent, false);
return new NotesAdapter.NotesViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull final NotesViewHolder holder, final int position) {
final Note note = notes.get(position);
holder.mNoteTitle.setText(notes.get(position).getmTitle());
holder.mNoteDesc.setText(notes.get(position).getmDescription());
String lastDayToConfirmNote = (notes.get(position).getmDay() + "/"
+ notes.get(position).getmMonth() + "/" + notes.get(position).getmYear());
holder.mLastDay.setText(lastDayToConfirmNote);
#Override
public int getItemCount() {
return notes.size();
}
public class NotesViewHolder extends RecyclerView.ViewHolder {
private TextView mNoteTitle;
private TextView mNoteDesc;
private TextView mLastDay;
private CardView note_card;
public NotesViewHolder(#NonNull View itemView) {
super(itemView);
mNoteTitle = itemView.findViewById(R.id.note_title);
mNoteDesc = itemView.findViewById(R.id.note_description);
mLastDay = itemView.findViewById(R.id.note_last_date);
note_card = itemView.findViewById(R.id.note_card);
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (onNoteClickListener!=null){
onNoteClickListener.onNoteClick(getAdapterPosition());
}
}
});
}
}
public void removeItem(ArrayList arrayList, int position) {
arrayList.remove(arrayList.get(position));
notifyItemRemoved(position);
notifyItemRangeChanged(position, arrayList.size());
}
}

According to your code, it seems that users is your parent root and you want to delete one of the child of users. For that, you will need the id of that child. You can get id and save it in ArrayList like
ArrayList<String> ids = new ArrayList
users.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull final DataSnapshot dataSnapshot) {
notes.clear();
for (DataSnapshot dataSnapshot1 : dataSnapshot.getChildren()) {
note = dataSnapshot1.getValue(Note.class);
notes.add(note);
ids.add(dataSnapshot1.getKey());//saving id of each child
}
adapter = new NotesAdapter(notes, getActivity());
RecyclerView.LayoutManager layoutManager = new GridLayoutManager(getActivity(), 3);
RVNotesList.setLayoutManager(layoutManager);
RVNotesList.setAdapter(adapter);
adapter.setOnNoteClickListener(new NotesAdapter.OnNoteClickListener() {
#Override
public void onNoteClick(final int position) {
users.child(ids.get(position)).removeValue();
}
});
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
}
});
NOTE : You have to update ids arraylist when you will update notes arraylist.

update firebase info without redrawing listview

I'm making a voting system in an android app that uses firebase as it's backend. I'm in the process of getting the user's vote status from their history, updating the view accordingly, and responding to vote touches on the buttons. The problem I'm having is that when a user clicks on the up or down vote buttons it redraws the listview, sometimes omitting two of the options, and always moving the scrolling of the view back up to the top. Can I update the data inside of a listview without completely redrawing that listview? If so, how?
MovieActivity.java
public class MovieActivity extends AppCompatActivity {
private static final String KEY_IMDB = "KEY_IMDB";
private ImageView mPosterImageView;
private TextView mTitleTextView;
private TextView mYearTextView;
private TextView mSummaryTextView;
private ListView triggerListView;
private ArrayList<Trigger> mTriggerPrefList;
private Movie mMovie;
private LinkedList<Trigger> resultList;
DatabaseReference movieDB;
DatabaseReference userDB;
DatabaseReference thisMovieDB;
DatabaseReference triggerDB;
DatabaseReference adminDB;
FirebaseAuth mFirebaseAuth;
FirebaseUser mUser;
ArrayList<Trigger> mTriggerList;
String imdbID;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_movie);
mPosterImageView = (ImageView) findViewById(R.id.posterImageView);
mTitleTextView = (TextView) findViewById(R.id.titleTextView);
mYearTextView = (TextView) findViewById(R.id.yearTextView);
mSummaryTextView = (TextView) findViewById(R.id.summaryTextView);
triggerListView = (ListView) findViewById(R.id.triggerListView);
mFirebaseAuth = FirebaseAuth.getInstance();
mUser = mFirebaseAuth.getCurrentUser();
movieDB = FirebaseDatabase.getInstance().getReference("movies");
userDB = FirebaseDatabase.getInstance().getReference("users");
adminDB = FirebaseDatabase.getInstance().getReference("admin");
Intent intent = getIntent();
intent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
imdbID = intent.getStringExtra("ID_KEY");
final String keyTitle = intent.getStringExtra("TITLE_KEY");
final String keyYear = intent.getStringExtra("YEAR_KEY");
final String keyPoster = intent.getStringExtra("POSTER_KEY");
try {
getMovieDetails(imdbID, new Runnable() {
#Override
public void run() {
CheckForTriggerValues(new Runnable() {
#Override
public void run() {
populateTriggers(new Runnable() {
#Override
public void run() {
populatePrefs(new Runnable() {
#Override
public void run() {
reOrderList(new Runnable() {
#Override
public void run() {
Movie passMovie = new Movie();
passMovie.setImdbID(imdbID);
passMovie.setPosterURL(keyPoster);
passMovie.setYear(keyYear);
passMovie.setTitle(keyTitle);
TriggerAdapter adapter = new TriggerAdapter(MovieActivity.this, resultList, passMovie, imdbID );
triggerListView.setAdapter(adapter);
}
});
}
});
}
});
}
});
}
});
} catch (JSONException e) {
e.printStackTrace();
}
thisMovieDB = movieDB.child(imdbID);
triggerDB = thisMovieDB.child("Triggers");
}
#Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putString(KEY_IMDB, imdbID);
}
#Override
protected void onStart() {
super.onStart();
Intent intent = getIntent();
intent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
imdbID = intent.getStringExtra("ID_KEY");
}
private void getMovieDetails(String imdbID, Runnable runnable) throws JSONException {
String apiKey = OMITTED;
String theURL = "http://www.omdbapi.com/?i=" + imdbID + "&apikey=" + apiKey;
final OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder().url(theURL).build();
client.newCall(request).enqueue(new Callback() {
#Override
public void onFailure(Call call, IOException e) {
e.printStackTrace();
}
#Override
public void onResponse(Call call, Response response) throws IOException {
final String jsonData = response.body().string();
if (response.isSuccessful()) {
runOnUiThread(new Runnable() {
#Override
public void run() {
try {
Movie movie = parseMovieDetails(jsonData);
updateMovieUI(movie);
} catch (JSONException e) {
e.printStackTrace();
}
}
});
}
}
});
runnable.run();
}
private Movie parseMovieDetails(String jsonData) throws JSONException {
JSONObject jsonObject = new JSONObject(jsonData);
Movie movie = new Movie();
movie.setPosterURL(jsonObject.getString("Poster"));
movie.setTitle(jsonObject.getString("Title"));
movie.setYear(jsonObject.getString("Year"));
movie.setSummary(jsonObject.getString("Plot"));
mMovie = movie;
return movie;
}
private void updateMovieUI(Movie movie){
Context mContext = getApplicationContext();
mSummaryTextView.setText(movie.getSummary());
mYearTextView.setText(movie.getYear());
mTitleTextView.setText(movie.getTitle());
Picasso.with(mContext).load(movie.getPosterURL()).into(mPosterImageView);
}
private void populatePrefs(final Runnable runnable) {
mTriggerPrefList = new ArrayList<>();
mFirebaseAuth = FirebaseAuth.getInstance();
mUser = mFirebaseAuth.getCurrentUser();
movieDB = FirebaseDatabase.getInstance().getReference("movies");
userDB = FirebaseDatabase.getInstance().getReference("users");
adminDB = FirebaseDatabase.getInstance().getReference("admin");
thisMovieDB = movieDB.child(imdbID);
thisMovieDB.child("Details").setValue(mMovie);
triggerDB = thisMovieDB.child("Triggers");
userDB.child(mUser.getUid()).child("preferences").child("trigger").addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot triggerSnapshot : dataSnapshot.getChildren()) {
String name = String.valueOf(triggerSnapshot.child("triggerName").getValue());
Trigger trigger = new Trigger();
trigger.setTriggerName(name);
trigger.setTriggerVotesTotal(0);
trigger.setTriggerVotesYes(0);
mTriggerPrefList.add(trigger);
}
Intent intent = getIntent();
intent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
imdbID = intent.getStringExtra("ID_KEY");
runnable.run();
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
private void populateTriggers(final Runnable runnable) {
mTriggerList = new ArrayList<>();
mFirebaseAuth = FirebaseAuth.getInstance();
mUser = mFirebaseAuth.getCurrentUser();
movieDB = FirebaseDatabase.getInstance().getReference("movies");
userDB = FirebaseDatabase.getInstance().getReference("users");
adminDB = FirebaseDatabase.getInstance().getReference("admin");
thisMovieDB = movieDB.child(imdbID);
thisMovieDB.child("Details").setValue(mMovie);
triggerDB = thisMovieDB.child("Triggers");
triggerDB.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
mTriggerList.clear();
for (DataSnapshot triggerSnapshot : dataSnapshot.getChildren()) {
Trigger trigger = triggerSnapshot.getValue(Trigger.class);
mTriggerList.add(trigger);
}
runnable.run();
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
private void reOrderList(Runnable runnable) {
resultList = new LinkedList<>();
for (Trigger triggerA : mTriggerList) {
boolean found = false;
for (Trigger triggerB : mTriggerPrefList) {
if (triggerB.getTriggerName().equals(triggerA.getTriggerName())) {
found = true;
}
}
if (found) {
resultList.add(triggerA);
}
}
mTriggerList.removeAll(resultList);
resultList.addAll(mTriggerList);
runnable.run();
}
private void CheckForTriggerValues(final Runnable runnable) {
adminDB.child("triggerList").addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
GenericTypeIndicator<Map<String, Object>> genericTypeIndicator = new GenericTypeIndicator<Map<String, Object>>() {};
final Map<String, Object> triggerList = dataSnapshot.getValue(genericTypeIndicator);
triggerDB.addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (Map.Entry<String, Object> entry : triggerList.entrySet())
{
if (dataSnapshot.hasChild(entry.getKey())){
}
else {
Trigger trigger1 = new Trigger(entry.getKey(), 0, 0);
triggerDB.child(trigger1.getTriggerName()).setValue(trigger1);
}
}
runnable.run();
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
int isTrue(Boolean boolDown, Boolean boolUp) {
int x = 0;
if (boolUp) {
x = 1;
}
if (boolDown) {
x = -1;
}
return x;
}
}
TriggerAdapter.java
package me.paxana.cwnet.Adapters;
import android.app.Activity;
import android.content.Context;
import android.content.res.ColorStateList;
import android.graphics.Typeface;
import android.os.Build;
import android.provider.ContactsContract;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.TextView;
import com.andremion.counterfab.CounterFab;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.ChildEventListener;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.MutableData;
import com.google.firebase.database.Transaction;
import com.google.firebase.database.ValueEventListener;
import java.util.List;
import me.paxana.cwnet.Model.Movie;
import me.paxana.cwnet.Model.Trigger;
import me.paxana.cwnet.R;
import me.paxana.cwnet.ui.AdminPanelActivity;
import me.paxana.cwnet.ui.MovieActivity;
/**
* Created by paxie on 10/11/17.
*/
public class TriggerAdapter extends BaseAdapter {
private Context mContext;
private List<Trigger> mTriggers;
private Movie mMovie;
private String mImdbID;
private String mTitle;
private String mYear;
private String mPosterURL;
private DatabaseReference movieDB;
private DatabaseReference userDB;
private DatabaseReference triggerDB;
private DatabaseReference adminDB;
public TriggerAdapter(Context context, List<Trigger> triggerList, Movie movie, String imdbID){
mContext = context;
this.mTriggers = triggerList;
mMovie = movie;
mImdbID = imdbID;
mTitle = movie.getTitle();
mYear = movie.getYear();
mPosterURL = movie.getPosterURL();
};
public TriggerAdapter(Context context, List<Trigger> triggerList) {
mContext = context;
this.mTriggers = triggerList;
}
#Override
public int getCount() {
return this.mTriggers.size();
}
#Override
public Object getItem(int i) {
return mTriggers.get(i);
}
#Override
public long getItemId(int i) {
return 0;
}
#Override
public View getView(int i, View view, final ViewGroup viewGroup) {
final ViewHolder holder;
FirebaseAuth firebaseAuth = FirebaseAuth.getInstance();
FirebaseUser user = firebaseAuth.getCurrentUser();
movieDB = FirebaseDatabase.getInstance().getReference("movies");
userDB = FirebaseDatabase.getInstance().getReference("users");
adminDB = FirebaseDatabase.getInstance().getReference("admin");
final String mUserId = user.getUid();
final Trigger trigger = mTriggers.get(i);
if (view == null) {
view = LayoutInflater.from(mContext).inflate(R.layout.trigger_list_item, null);
holder = new ViewHolder();
holder.triggerName = view.findViewById(R.id.triggerName);
holder.upButton = view.findViewById(R.id.mTriggerButtonUp);
holder.downButton = view.findViewById(R.id.mTriggerButtonDown);
holder.total = view.findViewById(R.id.triggerCounter);
view.setTag(holder);
}
else {
holder = (ViewHolder) view.getTag();
}
holder.triggerName.setText(trigger.getTriggerName());
if (mContext instanceof AdminPanelActivity) {
holder.upButton.setVisibility(View.INVISIBLE);
holder.downButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
adminDB.child("triggerList").child(trigger.getTriggerName()).removeValue();
int i = mTriggers.indexOf(trigger);
mTriggers.remove(i);
TriggerAdapter.this.notifyDataSetChanged();
}
});
}
if (mContext instanceof MovieActivity) {
userDB.child(mUserId).child("changes").child(mImdbID).child("triggers").child(trigger.getTriggerName()).addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.getValue() != null) {
int userVote = dataSnapshot.getValue(Integer.class);
if (userVote == 0) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
holder.upButton.setBackgroundTintList(mContext.getResources().getColorStateList(R.color.colorAccent, null));
holder.downButton.setBackgroundTintList(mContext.getResources().getColorStateList(R.color.colorAccent, null));
}
else {
holder.upButton.setBackgroundTintList(mContext.getResources().getColorStateList(R.color.colorAccent));
holder.downButton.setBackgroundTintList(mContext.getResources().getColorStateList(R.color.colorAccent));
}
neitherButtonIsSelected(holder, trigger, mUserId);
}
if (userVote == 1) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
holder.upButton.setBackgroundTintList(mContext.getResources().getColorStateList(R.color.votebuttons, null));
holder.downButton.setBackgroundTintList(mContext.getResources().getColorStateList(R.color.colorAccent, null));
}
else {
holder.upButton.setBackgroundTintList(mContext.getResources().getColorStateList(R.color.votebuttons));
holder.downButton.setBackgroundTintList(mContext.getResources().getColorStateList(R.color.colorAccent));
}
upButtonIsSelected(holder, trigger, mUserId);
}
if (userVote == -1) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
holder.upButton.setBackgroundTintList(mContext.getResources().getColorStateList(R.color.colorAccent, null));
holder.downButton.setBackgroundTintList(mContext.getResources().getColorStateList(R.color.votebuttons, null));
}
else {
holder.upButton.setBackgroundTintList(mContext.getResources().getColorStateList(R.color.colorAccent));
holder.downButton.setBackgroundTintList(mContext.getResources().getColorStateList(R.color.votebuttons));
}
downButtonIsSelected(holder, trigger, mUserId);
}
}
else {
userDB.child(mUserId).child("changes").child(mImdbID).child("triggers").child(trigger.getTriggerName()).setValue(0);
}
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
holder.total.setText(String.valueOf(trigger.getTriggerVotesYes()));
holder.upButton.setCount(trigger.getTriggerVotesYes());
if (trigger.getTriggerVotesTotal() != 0){
holder.total.setText(String.valueOf(trigger.getTriggerVotesTotal()));
int downButtonCount = (trigger.getTriggerVotesTotal() - trigger.getTriggerVotesYes());
holder.downButton.setCount(downButtonCount);
}
return view;
}
private static class ViewHolder {
TextView triggerName;
CounterFab upButton;
CounterFab downButton;
TextView total;
}
private void neitherButtonIsSelected(final ViewHolder holder, final Trigger trigger, final String mUserId) {
holder.upButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
triggerDB = movieDB.child(mImdbID).child("Triggers").child(trigger.getTriggerName());
triggerDB.child("triggerVotesYes").runTransaction(new Transaction.Handler() {
#Override
public Transaction.Result doTransaction(MutableData mutableData) {
int count = mutableData.getValue(Integer.class);
mutableData.setValue(count + 1);
return Transaction.success(mutableData);
}
#Override
public void onComplete(DatabaseError databaseError, boolean b, DataSnapshot dataSnapshot) {
}
});
triggerDB.child("triggerVotesTotal").runTransaction(new Transaction.Handler() {
#Override
public Transaction.Result doTransaction(MutableData mutableData) {
int count = mutableData.getValue(Integer.class);
mutableData.setValue(count + 1);
userDB.child(mUserId).child("changes").child(mImdbID).child("triggers").child(trigger.getTriggerName()).setValue(1);
return Transaction.success(mutableData);
}
#Override
public void onComplete(DatabaseError databaseError, boolean b, DataSnapshot dataSnapshot) {
}
});
userDB.child(mUserId).child("changes").child(mImdbID).child("triggers").child(trigger.getTriggerName()).setValue(1);
}
});
holder.downButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(final View view) {
triggerDB.child("triggerVotesTotal").runTransaction(new Transaction.Handler() {
#Override
public Transaction.Result doTransaction(MutableData mutableData) {
int count = mutableData.getValue(Integer.class);
mutableData.setValue(count + 1);
userDB.child(mUserId).child("changes").child(mImdbID).child("triggers").child(trigger.getTriggerName()).setValue(1);
return Transaction.success(mutableData);
}
#Override
public void onComplete(DatabaseError databaseError, boolean b, DataSnapshot dataSnapshot) {
}
});
userDB.child(mUserId).child("changes").child(mImdbID).child("triggers").child(trigger.getTriggerName()).setValue(1);
}
});
}
private void upButtonIsSelected(final ViewHolder holder, final Trigger trigger, final String mUserId) {
holder.upButton.setOnClickListener(null);
holder.downButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(final View view) {
triggerDB = movieDB.child(mImdbID).child("Triggers").child(trigger.getTriggerName());
triggerDB.child("triggerVotesYes").runTransaction(new Transaction.Handler() {
#Override
public Transaction.Result doTransaction(MutableData mutableData) {
int count = mutableData.getValue(Integer.class);
mutableData.setValue(count - 1);
userDB.child(mUserId).child("changes").child(mImdbID).child("triggers").child(trigger.getTriggerName()).setValue(-1);
return Transaction.success(mutableData);
}
#Override
public void onComplete(DatabaseError databaseError, boolean b, DataSnapshot dataSnapshot) {
holder.downButton.getBackground().setAlpha(127);
}
});
}
});
}
private void downButtonIsSelected(final ViewHolder holder, final Trigger trigger, final String mUserId) {
holder.downButton.setOnClickListener(null);
holder.upButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(final View view) {
triggerDB = movieDB.child(mImdbID).child("Triggers").child(trigger.getTriggerName());
triggerDB.child("triggerVotesYes").runTransaction(new Transaction.Handler() {
#Override
public Transaction.Result doTransaction(MutableData mutableData) {
int count = mutableData.getValue(Integer.class);
mutableData.setValue(count + 1);
userDB.child(mUserId).child("changes").child(mImdbID).child("triggers").child(trigger.getTriggerName()).setValue(1);
return Transaction.success(mutableData);
}
#Override
public void onComplete(DatabaseError databaseError, boolean b, DataSnapshot dataSnapshot) {
holder.downButton.getBackground().setAlpha(127);
}
});
}
});
}
}

Following things might help you.
Use android:stackFromBottom="true" in the xml of your ListView
Instead of using mTriggerList.clear(); when updating, do not clear it and add the item to list only if the item does not already exist in the list.
Eg.
for(Trigger trigger: triggerSnapShot...){
if (!mTriggerList.contains(trigger)){
mTriggerList.add(trigger);
}
}
You may need to override the equals method in the Trigger class in order to make the method contains work properly.