Retrieve and display data from Firebase in an EditText and edit content and save it again

Question

I want to retrieve data from Firebase and display it in an EditText and allow the user make changes to it if the need arises

This is an android note app using Firebase as the database

I want to retrieve data from Firebase and display it in an EditText and allow the user make changes to it if the need arises.

public class HomeActivity extends AppCompatActivity {

    private Toolbar mToolbar;
    private FloatingActionButton mFABCreate;

    private FirebaseAuth mFirebaseAuth;
    private RecyclerView mRecyclerView;
    private DatabaseReference mDatabaseReference;

    String mPost_Key;
    String mKey;
    String mTitle;
    String mNote;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);

        mFirebaseAuth  = FirebaseAuth.getInstance();
        FirebaseUser lFirebaseUser = mFirebaseAuth.getCurrentUser();
        assert lFirebaseUser  != null;
        String uid = lFirebaseUser.getUid();
        mDatabaseReference = FirebaseDatabase.getInstance().getReference().child("AllData").child(uid);
        mDatabaseReference.keepSynced(true);



        mRecyclerView = findViewById(R.id.recycler);

        LinearLayoutManager lLinearLayoutManager = new LinearLayoutManager(this);
        lLinearLayoutManager.setStackFromEnd(true);
        lLinearLayoutManager.setReverseLayout(true); 
        mRecyclerView.setHasFixedSize(true);
        mRecyclerView.setLayoutManager(lLinearLayoutManager);


        mToolbar = findViewById(R.id.toolbar);
        mToolbar.setTitle("Quick Note");

        FloatingActionButton fab = findViewById(R.id.Add_Data);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                finish();
                startActivity(new Intent(HomeActivity.this, AddActivity.class));
            }
        });
    }

    @Override
    protected void onStart() {
        super.onStart();

        FirebaseRecyclerAdapter<Items, RecyclerViewAdapter> lAdapter = new FirebaseRecyclerAdapter<Items, RecyclerViewAdapter>(
                Items.class,
                R.layout.show_note,
                RecyclerViewAdapter.class,
                mDatabaseReference) {
            @Override
            protected void populateViewHolder(RecyclerViewAdapter recyclerViewAdapter, final Items items, final int i) {
                recyclerViewAdapter.setTitle(items.getTitle());
                recyclerViewAdapter.setNote(items.getNote());
                recyclerViewAdapter.setDate(items.getDate());

                recyclerViewAdapter.mView.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        mPost_Key = getRef(i).getKey();
                        mTitle = items.getTitle();
                        mNote = items.getNote();

                        editData();
                    }
                });

            }
        };
        mRecyclerView.setAdapter(lAdapter);
    }


    private void editData(){
        startActivity(new Intent(getApplicationContext(), EditActivity.class));
    }


    public static class RecyclerViewAdapter extends RecyclerView.ViewHolder{
        View mView;
        public RecyclerViewAdapter(@NonNull View itemView) {
            super(itemView);
            mView = itemView;
        }
        public void setTitle (String title){
            TextView lTitle = mView.findViewById(R.id.showTitle);
            lTitle.setText(title);
        }

        public void setNote (String note){
            TextView lNote = mView.findViewById(R.id.showNote);
            lNote.setText(note);
        }

        public void setDate (String date){
            TextView lDate = mView.findViewById(R.id.showDate);
            lDate.setText(date);
        }
    }

}

public class EditActivity extends AppCompatActivity {
    private FirebaseAuth mAuth;
    private DatabaseReference mDatabaseReference;
    private FirebaseDatabase mFirebaseDatabase;
    RecyclerView mRecyclerView;

    String mPost_Key;
    String mTitle, mNote;
    String lTitleFire;
    String lNoteFire;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_edit);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        final EditText lTitle = findViewById(R.id.YourTitleEdit);
        final TextView lNote = findViewById(R.id.Your_Note_Add);
        mAuth = FirebaseAuth.getInstance();
        mFirebaseDatabase = FirebaseDatabase.getInstance();
        mDatabaseReference = mFirebaseDatabase.getReference(mAuth.getUid());
        mDatabaseReference.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                Items lGetValues  = dataSnapshot.getValue(Items.class);
                assert lGetValues != null;
                lTitle.setText(lGetValues.getTitle());
                lNote.setText(lGetValues.getNote());
            }

            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {
                Toast.makeText(getApplicationContext(), "Getting value failed", Toast.LENGTH_LONG).show();

            }
        });

    }

}

public class Items {
    String title;
    String note;
    String date;
    String id;

    public Items() {
    }

    public Items(String title, String note, String date, String id) {
        this.title = title;
        this.note = note;
        this.date = date;
        this.id = id;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getNote() {
        return note;
    }

    public void setNote(String note) {
        this.note = note;
    }

    public String getDate() {
        return date;
    }

    public void setDate(String date) {
        this.date = date;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }
}    

Firebase data:

AllData
  nakrU3ArQNShLzyn9U8X9fAFNeL2
    -LopLNpUFmepM8gvCmHS
      date:
      id:
      note:
      title: 

My aim is to set the values gotten from Firebase and display it into the "EditActivity"

Answer 1

it just display blank EditText

Assuming you get no errors, and there isn't empty strings saved in Firebase values, if you look at the data in Firebase, you have two ID values, yet you are only querying for the top one

AllData
    nakrU3ArQNShLzyn9U8X9fAFNeL2  # Uid
        -LopLNpUFmepM8gvCmHS  # a specific item 

You'll need to add another reference to the specific item, then add the value listener to that for it to show in the EditText. For example,

String itemId = ...;
mDatabaseReference.child(itemId)
    .addValueEventListener(... 

---

In order to get that id, you'll need to pass it to the next activity when you click it like so

editData(getRef(i).getKey());

Therefore, in that editData method, pass the id as an Intent extra so it can be found by the EditActivity

private void editData(String itemId) {
    Intent intent = new Intent(HomeActivity.this, EditActivity.class);
    intent.putExtra("EXTRA_ITEM_ID", itemId);
    startActivity(intent);
} 

Then over in the EditActivity, you need to get and use the item ID to query for a specific item

String itemId = getIntent().getStringExtra("EXTRA_ITEM_ID");
// wouldn't hurt to log the ID value for debugging here 
mDatabaseReference.child(itemId)
    .addValueEventListener(... 

Then keep everything else you already have

That should at least display something...

---

Then you'll want to add a save button somewhere so that you can write the value back to Firebase, as it won't save automatically as you type (unless you implement that, but I wouldn't recommend that because it'll create a lot of unnecessary network calls)

Items toSave =... 
mDatabaseReference.child(itemId).setValue(toSave);