CommentActivity Bleed

package info.rekayasa.donordarah.activity;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import com.firebase.ui.database.FirebaseRecyclerAdapter;
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.Query;
import com.google.firebase.database.ServerValue;
import com.google.firebase.database.ValueEventListener;

import java.security.Timestamp;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

import info.rekayasa.donordarah.R;
import info.rekayasa.donordarah.adapter.CommentViewHolder;
import info.rekayasa.donordarah.entity.Comment;

import static android.icu.lang.UCharacter.GraphemeClusterBreak.T;

public class CommentActivity extends BaseActivity {

    EditText mCommentField;
    Button mSendButton;
    TextView mNoComments;

    RecyclerView mRecyclerView;
    LinearLayoutManager mManager;

    DatabaseReference mDatabase, mRef;
    long timestamp;
    String comKey;

    String postId, fullName;
    int commentCount;

    FirebaseRecyclerAdapter<Comment, CommentViewHolder> mAdapter;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_comment);

        Bundle extras = getIntent().getExtras();
        postId = extras.getString("postKey");
        fullName = extras.getString("fullName");

        mCommentField = (EditText) findViewById(R.id.etComment);
        mSendButton = (Button) findViewById(R.id.btnSend);
        mNoComments = (TextView) findViewById(R.id.tvNoComments);

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

        mSendButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String commentTime = String.valueOf(ServerValue.TIMESTAMP);
//                System.out.println("timestamp: " + commentTime);
                final String comment = mCommentField.getText().toString();
                if (TextUtils.isEmpty(comment)) {
                    mCommentField.setError("Komentar harus berisi");
                } else {
                    comKey = mDatabase.child("comments").child(postId).push().getKey();
                    mDatabase.child("comments").child(postId).child(comKey).child("timestamp").setValue(ServerValue.TIMESTAMP);

                    final Query comCount = mDatabase.child("bleeds").child(postId).child("commentCount");
                    comCount.addValueEventListener(new ValueEventListener() {
                        @Override
                        public void onDataChange(DataSnapshot dataSnapshot) {
                            commentCount = dataSnapshot.getValue(int.class);
//                            System.out.println("commentCount: " + commentCount);
                        }

                        @Override
                        public void onCancelled(DatabaseError databaseError) {

                        }
                    });

                    Query query = mDatabase.child("comments").child(postId).child(comKey).child("timestamp");
                    query.addValueEventListener(new ValueEventListener() {
                        @Override
                        public void onDataChange(DataSnapshot dataSnapshot) {
                            timestamp = dataSnapshot.getValue(long.class);

                            // posting komentar
                            Comment com = new Comment(comment, fullName, postId, timestamp, null);
                            mDatabase.child("comments").child(postId).child(comKey).setValue(com);
                            mDatabase.child("bleeds").child(postId).child("commentCount").setValue(commentCount + 1);
                        }

                        @Override
                        public void onCancelled(DatabaseError databaseError) {

                        }
                    });
                    mCommentField.setText("");
                }
            }
        });

        mRecyclerView = (RecyclerView) findViewById(R.id.commentList);
        mRecyclerView.setHasFixedSize(true);
        mManager = new LinearLayoutManager(this);
//        mManager.setReverseLayout(true);
//        mManager.setStackFromEnd(true);
        mRecyclerView.setLayoutManager(mManager);


    }

    @Override
    protected void onStart() {
        super.onStart();
        mDatabase = FirebaseDatabase.getInstance().getReference();
        mRef = FirebaseDatabase.getInstance().getReference().child("comments").child(postId);

        mAdapter = new FirebaseRecyclerAdapter<Comment, CommentViewHolder>(Comment.class, R.layout.item_comment,
                CommentViewHolder.class, mRef) {
            @Override
            protected void populateViewHolder(CommentViewHolder viewHolder, Comment model, int position) {
                viewHolder.bindToPost(model);
//                System.out.println("model: " + model.comment);
//                if (model.comment.length() > 0){
                    mNoComments.setVisibility(View.GONE);
//                }
            }
        };
        mRecyclerView.setAdapter(mAdapter);
    }
}