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Getting Record from Firebase with AsyncTask?

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0

I would like to get a object I have stored on fire-base with async task. i am passing an object array-list that will fill the ui with the adapter, array-list of string, books i want to retrieve, and an adapter that i would like to update the ui with, but the Im stuck with async within async and Im not sure what to do. since the firebase calls of retrieving the data is done after asynctask post-execute is done.

i would like to call this with a

new FetchBookWithList(bookList,bookIdList,adapter).execute()

some of my code:

protected ArrayList<Book> doInBackground(String... strings) 
 try
 DatabaseReference bookReference = FirebaseDatabase.getInstance().getReference().child("books");
 bookReference.addValueEventListener(new ValueEventListener() 
 @Override
 public void onDataChange(DataSnapshot dataSnapshot) 
 if(dataSnapshot.exists()) 
 try 
 for (DataSnapshot books : dataSnapshot.getChildren()) 
 if(bookListID.contains(books.child("bookID").getValue())) 
 Book book = books.getValue(Book.class);
 bookList.add(book);
 
 
 catch (Exception e)
 e.printStackTrace();
 
 
 
 @Override
 public void onCancelled(@NonNull DatabaseError databaseError) 
 Log.w("testing","Error: ", databaseError.toException());
 
 );
 catch (Exception e) 
 e.printStackTrace();
 
 return bookList;
 
@Override
 protected void onPostExecute(ArrayList<Book> s)
 super.onPostExecute(s);
 try 
 if(this.bookAdapter != null) 
 this.bookAdapter.notifyDataSetChanged();
 
 catch (Exception e)
 e.printStackTrace();
 

 

my full for class code: https://www.codepile.net/pile/YKYMXMK7

android firebase asynchronous

share|improve this question

asked Mar 25 at 22:26

Anjesh ShresthaAnjesh Shrestha

1544 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  There is no need to use an AsyncTask. The Firebase APIs are all already asynchronous and don't need to be invoked from another thread.
  
  – Doug Stevenson
  Mar 25 at 22:37
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Also bear in mind the onDataChange is on the UI thread so you could move the onPostExecute code after the for loop and do nothing in onPostExecute - but the best option is to just get rid of async task as previous comment states.
  
  – Andy
  Mar 25 at 23:33
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @DougStevenson how would i get about that with a one liner call, since i have to call this from multiple different classes Andy, thank you thats what I ended up going for now
  
  – Anjesh Shrestha
  Mar 27 at 16:20
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I'm not sure what your problem is here. Just make a utility function? There's really no need for AsyncTask here.
  
  – Doug Stevenson
  Mar 27 at 16:24
  

  
  
  
  

add a comment | 

0

I would like to get a object I have stored on fire-base with async task. i am passing an object array-list that will fill the ui with the adapter, array-list of string, books i want to retrieve, and an adapter that i would like to update the ui with, but the Im stuck with async within async and Im not sure what to do. since the firebase calls of retrieving the data is done after asynctask post-execute is done.

i would like to call this with a

new FetchBookWithList(bookList,bookIdList,adapter).execute()

some of my code:

protected ArrayList<Book> doInBackground(String... strings) 
 try
 DatabaseReference bookReference = FirebaseDatabase.getInstance().getReference().child("books");
 bookReference.addValueEventListener(new ValueEventListener() 
 @Override
 public void onDataChange(DataSnapshot dataSnapshot) 
 if(dataSnapshot.exists()) 
 try 
 for (DataSnapshot books : dataSnapshot.getChildren()) 
 if(bookListID.contains(books.child("bookID").getValue())) 
 Book book = books.getValue(Book.class);
 bookList.add(book);
 
 
 catch (Exception e)
 e.printStackTrace();
 
 
 
 @Override
 public void onCancelled(@NonNull DatabaseError databaseError) 
 Log.w("testing","Error: ", databaseError.toException());
 
 );
 catch (Exception e) 
 e.printStackTrace();
 
 return bookList;
 
@Override
 protected void onPostExecute(ArrayList<Book> s)
 super.onPostExecute(s);
 try 
 if(this.bookAdapter != null) 
 this.bookAdapter.notifyDataSetChanged();
 
 catch (Exception e)
 e.printStackTrace();
 

 

my full for class code: https://www.codepile.net/pile/YKYMXMK7

android firebase asynchronous

share|improve this question

asked Mar 25 at 22:26

Anjesh ShresthaAnjesh Shrestha

1544 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  There is no need to use an AsyncTask. The Firebase APIs are all already asynchronous and don't need to be invoked from another thread.
  
  – Doug Stevenson
  Mar 25 at 22:37
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Also bear in mind the onDataChange is on the UI thread so you could move the onPostExecute code after the for loop and do nothing in onPostExecute - but the best option is to just get rid of async task as previous comment states.
  
  – Andy
  Mar 25 at 23:33
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @DougStevenson how would i get about that with a one liner call, since i have to call this from multiple different classes Andy, thank you thats what I ended up going for now
  
  – Anjesh Shrestha
  Mar 27 at 16:20
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I'm not sure what your problem is here. Just make a utility function? There's really no need for AsyncTask here.
  
  – Doug Stevenson
  Mar 27 at 16:24
  

  
  
  
  

add a comment | 

I would like to get a object I have stored on fire-base with async task. i am passing an object array-list that will fill the ui with the adapter, array-list of string, books i want to retrieve, and an adapter that i would like to update the ui with, but the Im stuck with async within async and Im not sure what to do. since the firebase calls of retrieving the data is done after asynctask post-execute is done.

i would like to call this with a

new FetchBookWithList(bookList,bookIdList,adapter).execute()

some of my code:

protected ArrayList<Book> doInBackground(String... strings) 
 try
 DatabaseReference bookReference = FirebaseDatabase.getInstance().getReference().child("books");
 bookReference.addValueEventListener(new ValueEventListener() 
 @Override
 public void onDataChange(DataSnapshot dataSnapshot) 
 if(dataSnapshot.exists()) 
 try 
 for (DataSnapshot books : dataSnapshot.getChildren()) 
 if(bookListID.contains(books.child("bookID").getValue())) 
 Book book = books.getValue(Book.class);
 bookList.add(book);
 
 
 catch (Exception e)
 e.printStackTrace();
 
 
 
 @Override
 public void onCancelled(@NonNull DatabaseError databaseError) 
 Log.w("testing","Error: ", databaseError.toException());
 
 );
 catch (Exception e) 
 e.printStackTrace();
 
 return bookList;
 
@Override
 protected void onPostExecute(ArrayList<Book> s)
 super.onPostExecute(s);
 try 
 if(this.bookAdapter != null) 
 this.bookAdapter.notifyDataSetChanged();
 
 catch (Exception e)
 e.printStackTrace();
 

 

my full for class code: https://www.codepile.net/pile/YKYMXMK7

android firebase asynchronous

share|improve this question

asked Mar 25 at 22:26

Anjesh ShresthaAnjesh Shrestha

1544 bronze badges

new FetchBookWithList(bookList,bookIdList,adapter).execute()

protected ArrayList<Book> doInBackground(String... strings) 
 try
 DatabaseReference bookReference = FirebaseDatabase.getInstance().getReference().child("books");
 bookReference.addValueEventListener(new ValueEventListener() 
 @Override
 public void onDataChange(DataSnapshot dataSnapshot) 
 if(dataSnapshot.exists()) 
 try 
 for (DataSnapshot books : dataSnapshot.getChildren()) 
 if(bookListID.contains(books.child("bookID").getValue())) 
 Book book = books.getValue(Book.class);
 bookList.add(book);
 
 
 catch (Exception e)
 e.printStackTrace();
 
 
 
 @Override
 public void onCancelled(@NonNull DatabaseError databaseError) 
 Log.w("testing","Error: ", databaseError.toException());
 
 );
 catch (Exception e) 
 e.printStackTrace();
 
 return bookList;
 
@Override
 protected void onPostExecute(ArrayList<Book> s)
 super.onPostExecute(s);
 try 
 if(this.bookAdapter != null) 
 this.bookAdapter.notifyDataSetChanged();
 
 catch (Exception e)
 e.printStackTrace();
 

 

android firebase asynchronous

android firebase asynchronous

share|improve this question

asked Mar 25 at 22:26

Anjesh ShresthaAnjesh Shrestha

1544 bronze badges

share|improve this question

asked Mar 25 at 22:26

Anjesh ShresthaAnjesh Shrestha

1544 bronze badges

asked Mar 25 at 22:26

Anjesh ShresthaAnjesh Shrestha

1544 bronze badges

asked Mar 25 at 22:26

Anjesh ShresthaAnjesh Shrestha

1544 bronze badges