Error Java.lang.nosuchmethoderror On My Firebase Project

i tried to retrieving data from Firebase to recycler-view on my Android project. first, here's my structure database on firebase then, i write Ph class public class Ph { publ

Solution 1:

Try to remove your valueEventListener and do this instead

first Remove this listener

ValueEventListenerpostListener=newValueEventListener() {...

change this

mDatabase = FirebaseDatabase.getInstance().getReference("https://raspi-ph.firebaseio.com/Fakultas Teknik/ph");

to this

mDatabase = FirebaseDatabase.getInstance().getReference();

and then inside your onClick use that reference to access your data. With this for inside your onDataChange you can access all your values from the different keys

mDatabase.child("Fakultas Teknik").child("ph").addValueEventListener(newValueEventListener() {
        @OverridepublicvoidonDataChange(DataSnapshot dataSnapshot) {
            for(DataSnapshot childSnapshot : dataSnapshot.getChildren()){

                Ph ph = childSnapshot.getValue(Ph.class);
                String date = ph.getDate();
                Log.i("Date:",""+date);
             }
        }

        @OverridepublicvoidonCancelled(DatabaseError databaseError) {
            Toast.makeText(getApplicationContext(), databaseError.getMessage(), Toast.LENGTH_SHORT).show();

        }
    });

Or you can try to add your reference with getReferenceFromUrl()

mDatabase = FirebaseDatabase.getInstance().getReferenceFromUrl("https://raspi-ph.firebaseio.com/Fakultas Teknik/ph");

Solution 2:

this question is solve. i downloading google-service.json from firebase console and add it to project/app folder :)

Solution 3:

check your dependencies, make sure your Fire base core tally's with your fire base database.

For eExample

implementation 'com.google.firebase:firebase-core:16.0.1' implementation 'com.google.firebase:firebase-database:16.0.1'

not

implementation 'com.google.firebase:firebase-core:16.0.1' implementation 'com.google.firebase:firebase-database:10.0.1'

Solution 4:

I came across a similar error (not the same) with Firebase after implementing FirebaseAuth.

After trying a lot, I removed the FirebaseCore dependency and it worked.