Develop Reference

How to retrieve values from FireBase to JSONArray?

I got a source code of a food delivery app from git. he is parsing a website and displaying the menu items, I guess to see the
instead of this I have created a fire-base database and stored one food item for testing
I want to display my item from the fire-base to the app menu I will show the code of all food item fragment,
package com.example.guanzhuli.foody.HomePage.fragment;
public class AllTabFragment extends Fragment {
private String baseUrl = "http://rjtmobile.com/ansari/fos/fosapp/fos_food_loc.php?city=";
private String TAG = "ALLFOOD";
private StorageReference mStorageRef;
FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference mDatabase = FirebaseDatabase.getInstance().getReference("menu");
ArrayList<Food> foods = new ArrayList<>();
private RecyclerView mRecyclerView;
private AllFoodAdapter adapter;
private RecyclerView.LayoutManager layoutManager;
String foodName;
public AllTabFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_all_tab, container, false);
mDatabase.addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
foodName = snapshot.child("name").getValue().toString();
String foodPrice = snapshot.child("prize").getValue().toString();
Toast.makeText(getActivity(), foodName, Toast.LENGTH_SHORT).show();
}
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
// Request Data From Web Service
if (foods.size() == 0) {
objRequestMethod();
}
mRecyclerView = (RecyclerView) view.findViewById(R.id.recyclerview_all);
mRecyclerView.setHasFixedSize(false);
mRecyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
adapter = new AllFoodAdapter(getActivity(), foods);
adapter.setOnItemClickListener(new AllFoodAdapter.OnRecyclerViewItemClickListener() {
#Override
public void onItemClick(View view, String data) {
Bundle itemInfo = new Bundle();
for (int i = 0; i < foods.size(); i++) {
if (foods.get(i).getId() == Integer.valueOf(data)) {
itemInfo.putInt("foodId", foods.get(i).getId());
itemInfo.putString("foodName", foods.get(i).getName());
// itemInfo.putString("foodName", foodName);
itemInfo.putString("foodCat", foods.get(i).getCategory());
itemInfo.putString("foodRec", foods.get(i).getRecepiee());
itemInfo.putDouble("foodPrice", foods.get(i).getPrice());
itemInfo.putString("foodImage", foods.get(i).getImageUrl());
break;
}
}
FoodDetailFragment foodDetailFragment = new FoodDetailFragment();
foodDetailFragment.setArguments(itemInfo);
getActivity().getSupportFragmentManager()
.beginTransaction()
.setCustomAnimations(R.anim.fade_in, R.anim.fade_out, R.anim.fade_in, R.anim.fade_out)
.replace(R.id.main_fragment_container, foodDetailFragment)
.addToBackStack(AllTabFragment.class.getName())
.commit();
}
});
mRecyclerView.setAdapter(adapter);
return view;
}
private void objRequestMethod() {
HomePageActivity.showPDialog();
JsonObjectRequest jsonObjReq = new JsonObjectRequest(Request.Method.GET, buildUrl(), null, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject jsonObject) {
Log.d(TAG, jsonObject.toString());
try {
JSONArray foodsJsonArr = jsonObject.getJSONArray("Food");
for (int i = 0; i < foodsJsonArr.length(); i++) {
JSONObject c = foodsJsonArr.getJSONObject(i);
String id = c.getString("FoodId");
String name = c.getString("FoodName");
String recepiee = c.getString("FoodRecepiee");
String price = c.getString("FoodPrice");
String category = c.getString("FoodCategory");
String thumb = c.getString("FoodThumb");
final Food curFood = new Food();
curFood.setCategory(category);
curFood.setName(name);
curFood.setRecepiee(recepiee);
curFood.setPrice(Double.valueOf(price));
curFood.setId(Integer.valueOf(id));
curFood.setImageUrl(thumb);
foods.add(curFood);
// Log.e("Current Food", curFood.getName());
ImageLoader imageLoader = VolleyController.getInstance().getImageLoader();
imageLoader.get(thumb, new ImageLoader.ImageListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.e(TAG, "Image Load Error: " + error.getMessage());
}
#Override
public void onResponse(ImageLoader.ImageContainer response, boolean arg1) {
if (response.getBitmap() != null) {
curFood.setImage(response.getBitmap());
// Log.e("SET IMAGE", curFood.getName());
adapter.notifyData(foods);
}
}
});
foods.get(i).setImage(curFood.getImage());
}
} catch (Exception e) {
System.out.println(e);
}
HomePageActivity.disPDialog();
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError volleyError) {
VolleyLog.d(TAG, "ERROR" + volleyError.getMessage());
Toast.makeText(getActivity(), volleyError.getMessage(),
Toast.LENGTH_SHORT).show();
HomePageActivity.disPDialog();
}
});
VolleyController.getInstance().addToRequestQueue(jsonObjReq);
}
private String buildUrl() {
return baseUrl + HomePageActivity.City;
}
}
I got food name from fire-base and stored in the string called "foodname" Now I want to display it in the menu, how can I do it?
if my question is wrong please forgive me, please help me
package com.example.guanzhuli.foody.HomePage.adapter;
public class AllFoodAdapter extends RecyclerView.Adapter<AllHolder> implements
View.OnClickListener {
private Context mContext;
ArrayList<Food> foods;
public String TAG = "ALLFOOD";
//
// public AllFoodAdapter(Context context) {
// mContext = context;
// }
public AllFoodAdapter(Context context, ArrayList<Food> foods) {
mContext = context;
this.foods = foods;
}
#Override
public AllHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(mContext).inflate(R.layout.cardview_food, parent, false);
AllHolder allHolder = new AllHolder(v);
v.setOnClickListener(this);
return allHolder;
}
#Override
public void onBindViewHolder(AllHolder holder, int position) {
holder.mTextId.setText(String.valueOf(foods.get(position).getId()));
holder.mTextName.setText(foods.get(position).getName());
holder.mTextPrice.setText(String.valueOf(foods.get(position).getPrice()));
holder.mTextCategory.setText(foods.get(position).getCategory());
holder.mImageView.setImageBitmap(foods.get(position).getImage());
holder.itemView.setTag(foods.get(position).getId());
}
#Override
public int getItemCount() {
return foods.size();
}
public void notifyData(ArrayList<Food> foods) {
// Log.d("notifyData ", foods.size() + "");
this.foods = foods;
notifyDataSetChanged();
}
public static interface OnRecyclerViewItemClickListener {
void onItemClick(View view, String data);
}
private OnRecyclerViewItemClickListener mOnItemClickListener = null;
public void setOnItemClickListener(OnRecyclerViewItemClickListener listener) {
this.mOnItemClickListener = listener;
}
#Override
public void onClick(View view) {
if (mOnItemClickListener != null) {
mOnItemClickListener.onItemClick(view, String.valueOf(view.getTag()));
} else {
Log.e("CLICK", "ERROR");
}
}
}
class AllHolder extends RecyclerView.ViewHolder {
NetworkImageView mImage;
ImageView mImageView;
TextView mTextId, mTextName, mTextCategory, mTextPrice;
public AllHolder(View itemView) {
super(itemView);
// mImage = (NetworkImageView) itemView.findViewById(R.id.food_img);
mImageView = (ImageView) itemView.findViewById(R.id.food_img);
mTextId = (TextView) itemView.findViewById(R.id.food_id);
mTextName = (TextView) itemView.findViewById(R.id.food_name);
mTextPrice = (TextView) itemView.findViewById(R.id.food_price);
mTextId = (TextView) itemView.findViewById(R.id.food_id);
mTextCategory = (TextView) itemView.findViewById(R.id.food_category);
}
}
Please help me, because it is an important project for me

If you want to display the strings you have received from firebase in a new activity as a list, you can declare an ArrayList and then add those strings to it and then with an adapter set it to display.
In code it looks something like this:
private ArrayList array;
private ListView listView;
private FirebaseAuth mAuth = FirebaseAuth.getInstance();
private String curName;
//set them
listView = findViewById(R.id.list1);
array = new ArrayList<String>();
DatabaseReference ref = FirebaseDatabase.getInstance().getReference().child("menu");
ref.addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
for (DataSnapshot ds : dataSnapshot.getChildren()) {
array.add(ds.child("name").getValue(String.class));
}
ArrayAdapter adapter = new ArrayAdapter(Main6Activity.this, android.R.layout.simple_list_item_1, array);
listView.setAdapter(adapter);
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
}
});

stackoverflow was not conceived to get complete code solutions. We can only help you on some point. Other than that, you need to think to use the Food class for read and write values on your db. When you retrive the values, get it as a Food object casting it by method dataSnapshot.getValue("object class");...
In your case you need a code like this:
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
Food food = snapshot.getValue(Food.class);
//here you need to add the food object to a list and after the for diplay it with adapter.
//for example foodsList.add(food);
}
foodsList.setAdapter(myAdepter); //ecc
}
If you need help, please tell us more

You seem to be loading the food items from the database, and reading the values from them. All that's left to do, is add each item to the foods array, and tell the adapter that its data has changed:
mDatabase.addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
String foodName = snapshot.child("name").getValue(String.class);
String foodPrice = snapshot.child("prize").getValue(String.class);
Food food = new Food();
food.setName(name);
food.setPrice(Double.valueOf(price));
foods.add(food);
}
adapter.notifyDataSetChanged();
}
#Override
public void onCancelled(DatabaseError databaseError) {
throw databaseError.toException();
}
});

Unable to display all images from firebase database and I want to show all images from one id into grid view

This is my firebase storage image and I want to display all images from url into gridview by taking the current user id
This is my main activity onstart() that leads to adapter class.
I want to show all the images under current user id like grid view.
How to display all user image posts in grid view from firebase above image.
#Override
protected void onStart() {
super.onStart();
FirebaseUser currentUser = mAuth.getCurrentUser();
uploads = new ArrayList<Blog>();
if (currentUser != null && !currentUser.isAnonymous()) {
mUserf.child("online").setValue("true");
mProgressbar.setMessage("Welcome.....");
mProgressbar.show();
mProgressbar.dismiss();
ConnectivityManager check = (ConnectivityManager)getSystemService(CONNECTIVITY_SERVICE);
NetworkInfo info = check.getActiveNetworkInfo(); //for checking whether app is connected to a network or not..
if(info!=null && info.isConnected()) {
//Toast.makeText(MainActivity.this, "network available", Toast.LENGTH_SHORT).show();
firebaseAuth.addAuthStateListener(authStateListener);
mProgressbar.setMessage("Fetching Blogs.....");
mProgressbar.show();
mProgressbar.dismiss();
list = new ArrayList<>();
adapter = new MyCustomAdapter(this,list,firebaseAuth,mdatabaseReference,likesdatabaseReference);
recyclerView = (RecyclerView) findViewById(R.id.blog_list);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setAdapter(adapter);
alpha = FirebaseDatabase.getInstance().getReference().child("Blog").child(mAuth.getCurrentUser().getUid());
mchildEventListener = new ChildEventListener() {
#Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
mProgressbar.dismiss();
String j = dataSnapshot.getKey();
Log.v("GETKEYZZZ", j);
Blog friendlyMessage = dataSnapshot.getValue(Blog.class);
friendlyMessage.setPostkey(j);
list.add(friendlyMessage);
adapter.notifyDataSetChanged();
}
public void onChildChanged(DataSnapshot dataSnapshot, String s) {}
public void onChildRemoved(DataSnapshot dataSnapshot){}
public void onChildMoved(DataSnapshot dataSnapshot, String s) {}
public void onCancelled(DatabaseError databaseError) {}
};
mquery.addChildEventListener(mchildEventListener);
} else {
//Toast.makeText(MainActivity.this, "No network available", Toast.LENGTH_SHORT).show();
Toast.makeText(getApplicationContext(),"Please Check Your Internet Connection", Toast.LENGTH_LONG).show();
}
// mDatabseUsers.child("online").setValue("true");
} else {
Intent user1 = new Intent(MainActivity.this, LoginActivity.class);
startActivity(user1);
}
}
This is my adapter class where
public class MyCustomAdapter extends RecyclerView.Adapter<MyCustomAdapter.myviewholder> {
Context context;
ArrayList<Blog> list;
List <String> imageUrls;
//List<String> imageUrls ;
LayoutInflater inflator;
int lastPosition = 1;
boolean mprogressLike = true,mprogressview = true;
DatabaseReference likeDatabaseReference;
FirebaseAuth firebaseAuth;
DatabaseReference blogDatabaseReference;
public MyCustomAdapter(Context context, ArrayList<Blog> list,FirebaseAuth firebaseAuth,DatabaseReference blogDatabaseReference, DatabaseReference likeDatabaseReference) {
this.context=context;
this.list=list;
inflator=LayoutInflater.from(context);
this.likeDatabaseReference=likeDatabaseReference;
this.firebaseAuth=firebaseAuth;
this.blogDatabaseReference=blogDatabaseReference;
}
#Override
public myviewholder onCreateViewHolder(ViewGroup parent, int position) {
View v=inflator.inflate(R.layout.posts,parent,false);//this view will contain appearance of each layout i.e each row..
myviewholder holder=new myviewholder(v);// we are passing the view of each row to the myviewholder class
return holder;
}
#Override
public void onBindViewHolder(final myviewholder holder, int position) {//here we will inflate datas in the widgets i.e image and title..
//It is called for each row..so every row is inflated here..
final Blog p=list.get(position);
holder.title.setText(p.getTitle());
holder.username.setText(p.getUsername());
holder.viewno.setText(p.getTimestamp());
/*int count = 0;
for(HospitalModel.Images images: hospitalModelList.get(position).getImagesList()) {
count += images.size();
}*/
for(Blog model : list) {
imageUrls = new ArrayList<>();;
imageUrls.addAll(model.getUrl());
Log.v("IMURLSSS", String.valueOf(imageUrls));
Picasso.with(context).load(imageUrls.get(position)).into(holder.imageview);
Log.v("IMGGPOS", imageUrls.get(position));
}
Picasso.with(context).load(p.getImage()).into(holder.userdp);
}
#Override
public int getItemCount() {
return list.size();
}
public class myviewholder extends RecyclerView.ViewHolder implements View.OnClickListener {
// It contains the elements in each row that we will inflate in the recyclerView..
TextView title,desc,username,likeno,viewno;
ImageView imageview,userdp, over, comments, likes;
ImageButton likebtn,viewbtn;
public myviewholder(View itemView) {
super(itemView);
title = (TextView) itemView.findViewById(R.id.blog_desc);//here we link with the elements of each view i.e each row and
// desc = (TextView) itemView.findViewById(R.id.postdesc);//here we link with the elements of each view i.e each row and
username = (TextView) itemView.findViewById(R.id.blog_user_name);
viewno = (TextView) itemView.findViewById(R.id.blog_date);
likeno = (TextView) itemView.findViewById(R.id.blog_like_count);
userdp = (ImageView) itemView.findViewById(R.id.blog_user_image);
imageview = (ImageView) itemView.findViewById(R.id.blog_image);
comments = (ImageView) itemView.findViewById(R.id.blog_comment_icon);
//here we link with the elements of each view i.e each row and
// likebtn = (ImageButton)itemView.findViewById(R.id.likebtn);
// viewbtn = (ImageButton)itemView.findViewById(R.id.viewbtn);
comments.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
mprogressview = true;
int pos = getAdapterPosition();
Blog b = list.get(pos);
Intent intent = new Intent(context,CommentBox.class);
Bundle bundle = new Bundle();
bundle.putString("post_key",b.getUid().toString());
intent.putExtras(bundle);
context.startActivity(intent);
}
});
over = (ImageView) itemView.findViewById(R.id.overflow);
over.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
showFilterPopup(v);
}
});
});
itemView.setOnClickListener(this);
}
}

To display all those url's, please use the following lines of code:
String uid = FirebaseAuth.getInstance().getCurrentUser().getUid();
DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference urlRef = rootRef.child("Blog").child(uid).child("url");
ValueEventListener valueEventListener = new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
for(DataSnapshot ds : dataSnapshot.getChildren()) {
String url = ds.getValue(String.class);
Log.d("TAG", url);
}
}
#Override
public void onCancelled(DatabaseError databaseError) {}
};
urlRef.addListenerForSingleValueEvent(valueEventListener);
And here is a recommended way in which you can retrieve data from a Firebase Realtime database and display it in a RecyclerView using FirebaseRecyclerAdapter.
Edit:
String uid = FirebaseAuth.getInstance().getCurrentUser().getUid();
DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference uidRef = rootRef.child("Blog").child(uid);
ValueEventListener valueEventListener = new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
String uid = dataSnapshot.child("uid").getValue(String.class);
String title = dataSnapshot.child("title").getValue(String.class);
String timestamp = dataSnapshot.child("timestamp").getValue(String.class);
Log.d("TAG", uid + " / " + title + " / " + timestamp);
for(DataSnapshot ds : dataSnapshot.child("url").getChildren()) {
String url = ds.getValue(String.class);
Log.d("TAG", url);
}
}
#Override
public void onCancelled(DatabaseError databaseError) {}
};
uidRef.addListenerForSingleValueEvent(valueEventListener);

cannot fetch values from firebase database

Main activity.java
public class activity_3 extends AppCompatActivity {
TextView question,option_1,option_2,option_3,description,winnner;
NumberProgressBar option_progress1, option_progress2,option_progress3;
int val_1;
int val_2;
int val_3;
DatabaseReference Polldata_3;
String optionOne;
String optionTwo;
String optionThree;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_3);
final String que = getIntent().getExtras().getString("que");
final String des = getIntent().getExtras().getString("des");
optionOne = getIntent().getExtras().getString("option1");
optionTwo = getIntent().getExtras().getString("option2");
optionThree = getIntent().getExtras().getString("option3");
final String id_user = getIntent().getExtras().getString("id");
val_1 = getIntent().getExtras().getInt("val1");
val_2 = getIntent().getExtras().getInt("val2");
val_2 = getIntent().getExtras().getInt("val3");
option_progress1 = (NumberProgressBar) findViewById(R.id.option1_progressbar);
option_progress2 = (NumberProgressBar) findViewById(R.id.option2_progressbar);
option_progress3 = (NumberProgressBar) findViewById(R.id.option3_progressbar);
Polldata_3 = FirebaseDatabase.getInstance().getReference("POll").child("poll_3");
final DatabaseReference answsersave = Polldata_3.child(id_user);
question = (TextView) findViewById(R.id.question_showpoll);
option_1 = (TextView) findViewById(R.id.option_1);
option_2 = (TextView) findViewById(R.id.option_2);
option_3 = (TextView) findViewById(R.id.option_3);
description = (TextView) findViewById(R.id.description_user_3);
winnner = (TextView) findViewById(R.id.winner);
option_1.setText(optionOne);
option_2.setText(optionTwo);
option_3.setText(optionThree);
question.setText(que);
description.setText(des);
option_progress1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
option_progress1.setProgress(val_1+1);
option_progress1.setEnabled(false);
option_progress2.setEnabled(false);
option_progress3.setEnabled(false);
val_1++;
answsersave.child("option_1_value").setValue(val_1);
//winnerdeclare();
}
});
option_progress2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
option_progress2.setProgress(val_2+1);
option_progress1.setEnabled(false);
option_progress2.setEnabled(false);
option_progress3.setEnabled(false);
val_2++;
answsersave.child("option_2_value").setValue(val_2);
// winnerdeclare();
}
});
option_progress3.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
option_progress3.setProgress(val_3+1);
option_progress1.setEnabled(false);
option_progress2.setEnabled(false);
option_progress3.setEnabled(false);
val_3++;
// winnerdeclare();
answsersave.child("option_3_value").setValue(val_3);
}
});
}
}
ADAPTER CLASS
public class listview_3 extends AppCompatActivity {
ListView listviewpoll3;
private DatabaseReference Poll_data_3;
List<addpoll_3> addpoll_3List;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_listview_3);
listviewpoll3 = (ListView) findViewById(R.id.poll_listview_3);
Poll_data_3 = FirebaseDatabase.getInstance().getReference("POll").child("poll_3");
addpoll_3List = new ArrayList<>();
listviewpoll3.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> adapter, View v, int position, long id) {
Intent intent = new Intent(listview_3.this, activity_3.class);
addpoll_3 poll = addpoll_3List.get(position);
final String optionone = poll.getOption_1();
final String optiontwo = poll.getOption_2();
final String optionthree = poll.getOption_3();
final String id_user = poll.getId();
final int value_1 = poll.getOption_1_value();
final int value_2 = poll.getOption_2_value();
final int value_3 = poll.getOption_3_value();
final String question = poll.getQuestion();
final String desp = poll.getDescription();
intent.putExtra("option1",optionone);
intent.putExtra("option2",optiontwo);
intent.putExtra("option3",optionthree);
intent.putExtra("id",id_user);
intent.putExtra("val1",value_1);
intent.putExtra("val2",value_2);
intent.putExtra("val3",value_3);
intent.putExtra("que",question);
intent.putExtra("descp",desp);
startActivity(intent);
}
});
}
#Override
protected void onStart() {
super.onStart();
Poll_data_3.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
addpoll_3List.clear();
for(DataSnapshot pollSnapshot: dataSnapshot.getChildren())
{
addpoll_3 poll = pollSnapshot.getValue(addpoll_3.class);
addpoll_3List.add(poll);
}
poll_list_3 adapter = new poll_list_3(listview_3.this,addpoll_3List);
listviewpoll3.setAdapter(adapter);
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
}
list class
public class poll_list_3 extends ArrayAdapter<addpoll_3> {
private Activity context;
private List<addpoll_3> addpoll_3List;
public poll_list_3(Activity context, List<addpoll_3> addpoll_3List) {
super(context, R.layout.list_layout, addpoll_3List);
this.context = context;
this.addpoll_3List = addpoll_3List;
}
#NonNull
#Override
public View getView(int position, #Nullable View convertView, #NonNull ViewGroup parent) {
LayoutInflater inflater = context.getLayoutInflater();
View viewitem = inflater.inflate(R.layout.list_layout,null);
TextView textViewName = (TextView) viewitem.findViewById(R.id.tv);
TextView textViewDesp = (TextView) viewitem.findViewById(R.id.tv1);
final addpoll_3 poll1 = addpoll_3List.get(position);
textViewName.setText(poll1.getQuestion());
textViewDesp.setText(poll1.getDescription());
return viewitem;
}
}
I am making a polling app where user can create a poll which is then stored in the firebase database and retrieved into listview of the app
when the user clicks on the list view he is directed to the the activity where there are number of progressbars
i have added a ON-click listener o the progress bar, So when user clicks on the progressbar the val of that option gets incremented in the database. so when a different user vote on the same poll the value from the database is fetched and value of the current user is added displaying the winner,but problem is the value of the progressbar1 gets the value from the database but the other two keep progress bar values start from 0 every time user clicks on the other two progress bar (ie 2 and 3).
please help
addpoll_3.java
public class addpoll_3 {
String id;
String question;
String description;
String option_1;
String option_2;
String option_3;
int option_1_value;
int option_2_value;
int option_3_value;
public addpoll_3(){}
public addpoll_3(String id, String question, String description, String option_1, String option_2, String option_3, int option_1_value, int option_2_value, int option_3_value) {
this.id = id;
this.question = question;
this.description = description;
this.option_1 = option_1;
this.option_2 = option_2;
this.option_3 = option_3;
this.option_1_value = option_1_value;
this.option_2_value = option_2_value;
this.option_3_value = option_3_value;
}
public String getId() {
return id;
}
public String getQuestion() {
return question;
}
public String getDescription() {
return description;
}
public String getOption_1() {
return option_1;
}
public String getOption_2() {
return option_2;
}
public String getOption_3() {
return option_3;
}
public int getOption_1_value() {
return option_1_value;
}
public int getOption_2_value() {
return option_2_value;
}
public int getOption_3_value() {
return option_3_value;
}
}

code:
Activity_3.java
val_1 = getIntent().getExtras().getInt("val1");
val_2 = getIntent().getExtras().getInt("val2");
val_3 = getIntent().getExtras().getInt("val3");
These were changes to be made

//Read from the database
myRef.addValueEventListener(new ValueEventListener()
{
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
// This method is called once with the initial value and again
// whenever data at this location is updated.
String value = dataSnapshot.getValue(String.class);
Log.d(TAG, "Value is: " + value);
}
#Override
public void onCancelled(DatabaseError error) {
// Failed to read value
Log.w(TAG, "Failed to read value.", error.toException());
}
});

Android - Firebase on data change refreshes the page

I'm kinda newbie to Android.
I have a recyclerview that I store in Firebase database.
My recyclerview are made of cardviews.
Inside each cardview I have a button that updates the node info in Firebase.
Each time the above is happening, my page refreshes (I guess to load the new data).
My mainactivity code relevant code(called on onCreate) :
private void loadRecyclerViewData() {
databaseReference.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (posts.size() > 0) {
posts.clear();
}
for (DataSnapshot ds : dataSnapshot.getChildren()) {
Post post = ds.getValue(Post.class);
//Getting a specific user's information (nickname purposes)
if (post.getSubGenreType().equals(SubGenreString)) {
posts.add(post);
Collections.reverse(posts);
}
}
adapter = new RecyclerAdapter(posts, getApplicationContext());
recyclerView.setAdapter(adapter);
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
my adapter :
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ViewHolder> {
public static Boolean isAyed = false;
private FirebaseAuth firebaseAuth;
private List<Post> posts;
private Context context;
private String userTryToAyeEmail;
public RecyclerAdapter(List<Post> posts, Context context) {
this.posts = posts;
this.context = context;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
firebaseAuth = FirebaseAuth.getInstance();
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.recycle_card, parent, false);
return new ViewHolder(v);
}
#RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
#Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
final Post post = posts.get(position);
holder.imageButton.setVisibility(View.GONE);
holder.editText.setVisibility(View.GONE);
String colorString = post.getPostColor();
int color = Color.parseColor(colorString);
int newNumOfLikes = post.getPostLikes();
int currentNumOfLikes = post.getPostLikes();
// holder.cardView.setCardBackgroundColor(color);
holder.textViewHead.setText(post.getPostContent());
holder.textViewNickname.setText(post.getPostNickname());
holder.textViewTimeStamp.setText(post.getPostTimeStamp());
holder.ayeButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Boolean userLiked = false;
if (firebaseAuth.getCurrentUser() != null) {
String currentUserEmail = firebaseAuth.getCurrentUser().getEmail();
List<String> currentLikedPost = post.getUserLikedList();
for (int i = 0; i < currentLikedPost.size(); i++) {
if (currentUserEmail.equals(currentLikedPost.get(i))) {
currentLikedPost.remove(i);
int newNumOfLikes = post.getPostLikes() - 1;
updateLikes(post.getId(), newNumOfLikes, post.getPostNickname(), post.getPostTimeStamp(), post.getPostContent(), post.getPostColor(), post.getSubGenreType(), post.getUserLikedList());
userLiked = true;
break;
}
}
if (!userLiked) {
currentLikedPost.add(currentUserEmail);
int newNumOfLikes = post.getPostLikes() + 1;
updateLikes(post.getId(), newNumOfLikes, post.getPostNickname(), post.getPostTimeStamp(), post.getPostContent(), post.getPostColor(), post.getSubGenreType(), post.getUserLikedList());
}
}
}
});
if (firebaseAuth.getCurrentUser() != null) {
String currentUserEmail = firebaseAuth.getCurrentUser().getEmail();
List<String> usersLikedPost = post.getUserLikedList();
for (int i = 0; i < usersLikedPost.size(); i++) {
if (currentUserEmail.equals(usersLikedPost.get(i))) {
holder.ayeButton.setTextColor(Color.parseColor("#FF0000"));
break;
}
}
}
holder.ayeTextView.setText(Integer.toString(newNumOfLikes));
holder.cardView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent myIntent = new Intent(context, SinglePostActivity.class);
myIntent.putExtra("postID", post.getId());
myIntent.putExtra("postNickname", post.getPostNickname());
myIntent.putExtra("postTimeStamp", post.getPostTimeStamp());
myIntent.putExtra("postContent", post.getPostContent());
myIntent.putExtra("postColor", post.getPostColor());
context.startActivity(myIntent);
}
});
}
private void updateLikes(String id, int newNumOfLikes, String postNickname, String postTimeStamp, String postContent, String postColor, String SubGenre, List<String> userLikedPostList) {
DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference("posts").child(id);
Post post = new Post(postColor, postContent, postNickname, postTimeStamp, id, newNumOfLikes, SubGenre, userLikedPostList);
databaseReference.setValue(post);
}
#Override
public int getItemCount() {
return posts.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
public TextView textViewHead;
public TextView textViewNickname;
public TextView textViewTimeStamp;
public TextView ayeButton;
public TextView ayeTextView;
public CardView cardView;
public LinearLayout linearLayout;
public EditText editText;
public ImageButton imageButton;
public ViewHolder(View itemView) {
super(itemView);
textViewHead = (TextView) itemView.findViewById(R.id.textViewHead);
textViewNickname = (TextView) itemView.findViewById(R.id.textViewNickname);
textViewTimeStamp = (TextView) itemView.findViewById(R.id.textViewTimeStamp);
ayeButton = (TextView) itemView.findViewById(R.id.ayeButton);
ayeTextView = (TextView) itemView.findViewById(R.id.ayeTextView);
cardView = (CardView) itemView.findViewById(R.id.cardViewID);
linearLayout = (LinearLayout) itemView.findViewById(R.id.cardLinearLayout);
editText = (EditText) itemView.findViewById(R.id.addCommentEditText);
imageButton = (ImageButton) itemView.findViewById(R.id.addCommentImageButton);
}
}
}
I wish the page to stay in place, how can I do that ??
Thank you all.

Set your adapter in onCreate and notify it from onDataChange
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.your_layout);
//initialize
.
.
//set adapter
adapter = new RecyclerAdapter(posts, getApplicationContext());
recyclerView.setAdapter(adapter);
}
private void loadRecyclerViewData() {
databaseReference.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (posts.size() > 0) {
posts.clear();
}
for (DataSnapshot ds : dataSnapshot.getChildren()) {
Post post = ds.getValue(Post.class);
//Getting a specific user's information (nickname purposes)
if (post.getSubGenreType().equals(SubGenreString)) {
posts.add(post);
Collections.reverse(posts);
}
}
adapter.notifyDataSetChanged(); //notify
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}

Sorting FirebaseRecyclerAdapter on Client Side

I want to sort FirebaseRecyclerAdapter on the TIME BASIS. I'm working on That Application so whenever new Message comes then That Dialog goes on The Top of the Layout, it also contain time of Sending the Message so The message which is new Then that should be in The Top of the Recyclerview. So So How Can i sort The FirebaseRecyclerAdapter on the Time Basis
Here is me Code
madapter = new FirebaseRecyclerAdapter<user, contact.UserViewHolder>(user.class, R.layout.activity_dialogs_list, contact.UserViewHolder.class, muserref) {
#Override
protected void populateViewHolder(final UserViewHolder viewHolder, user model, final int position) {
final String ais = model.getName();
viewHolder.setName(model.getName());
final String b = model.groupId;
//Toast.makeText(contact.this,viewHolder.getLayoutPosition(),LENGTH_SHORT).show();
mref = FirebaseDatabase.getInstance().getReference().child("LastMessage").child(b);
mref.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot childSnapShot : dataSnapshot.getChildren()) {
val=lmlm;
HashMap<String, Object> hashmap = (HashMap) dataSnapshot.getValue();
val = (String) hashmap.get("lastm");
Long role = (Long) hashmap.get("timestampCreated");
String lastsender = (String) hashmap.get("LastmessageSender");
getTimeago getTimeAgo = new getTimeago();
String lastSeenTime = getTimeAgo.getTimeAgo(role);
//SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yy HH:mm:ss");
//String dateAsString = sdf.format (role);
//change(position);
// swape(viewHolder.getAdapterPosition());
if (val.length() > 40) {
String nawa = val.substring(0, 40);
viewHolder.setLastmessage((nawa + "..."));
viewHolder.setLastTime(lastSeenTime);
} else {
viewHolder.setLastmessage(val);
viewHolder.setLastTime(lastSeenTime);
}
//viewHolder.setLastmessage(val);
}
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
mimage = FirebaseDatabase.getInstance().getReference().child("Image").child(b);
mimage.keepSynced(true);
mimage.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot childSnapShot : dataSnapshot.getChildren()) {
HashMap<String, Object> hashmap = (HashMap) dataSnapshot.getValue();
final String vala = (String) hashmap.get("image");
viewHolder.setImage(vala, getApplicationContext());
/// //viewHolder.setImage(val,getApplicationContext());
//viewHolder.setImage(vala);
}
}
#Override
public void onCancelled(DatabaseError databaseError) {
Toast.makeText(contact.this,"Something Went wrong",LENGTH_SHORT).show();
}
});
}
});
}
};
mUserlist.setAdapter(madapter);
madapter.notifyDataSetChanged();
And Here is My Holder
`
public static class UserViewHolder extends RecyclerView.ViewHolder {
View mview;
ImageLoader imageLoader;
public UserViewHolder(View itemView) {
super(itemView);
mview = itemView;
}
public void setName(String name) {
TextView username = (TextView) mview.findViewById(R.id.dialogName);
username.setText(name);
}
public void setLastmessage(String lastmessage) {
TextView set = (TextView) mview.findViewById(R.id.dialogLastMessage);
set.setText(lastmessage);
}
public void setLastTime(String lastTime) {
TextView time = (TextView) mview.findViewById(R.id.dialogDate);
time.setText(lastTime);
}
public void setImage(final String vala, final Context applicationContext) {
final CircleImageView cm = (CircleImageView) mview.findViewById(R.id.dialogAvatar);
Picasso.with(applicationContext).load(vala).networkPolicy(NetworkPolicy.OFFLINE).into(cm, new Callback() {
#Override
public void onSuccess() {
Picasso.with(applicationContext).load(vala).into(cm);
}
#Override
public void onError() {
Picasso.with(applicationContext).load(vala).into(cm);
}
});
}
`
So if new Message comes in SE Comps then that Dialog Show goes on The Top of RecyclerViewSo How can i get that please Help

Did you try orderByChild function to sort firebase list data?
ref.orderByChild('< time_key >')
OrderByChild will work with ChildEventListner
check this link