public class MessageAdapter extends RecyclerView.Adapter<MessageAdapter.MessageAdapterViewHolder> {
    private Context context;
    private List<Message> messages;
    public static final int MSG_TYPE_LEFT = 0;
    public static final int MSG_TYPE_RIGHT = 1;
    public MessageAdapter(Context context, List<Message> messages) {
        this.context = context;
        this.messages = messages;
    }
    @Override
    public int getItemViewType(int position) {
        FirebaseUser firebaseUser = FirebaseAuth.getInstance().getCurrentUser();
        assert firebaseUser != null;
        if (messages.get(position).getName().equals(firebaseUser.getDisplayName())) {
            return MSG_TYPE_RIGHT;
        } else {
            return MSG_TYPE_LEFT;
        }
    }
    @NonNull
    @Override
    public MessageAdapterViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        if (viewType == MSG_TYPE_RIGHT) {
            View view = LayoutInflater.from(context).inflate(R.layout.fragment_chat_message_sent, parent, false);
            return new MessageAdapterViewHolder(view);
        } else {
            View view = LayoutInflater.from(context).inflate(R.layout.fragment_chat_message_received, parent, false);
            return new MessageAdapterViewHolder(view);
        }
    }
    @Override
    public void onBindViewHolder(@NonNull final MessageAdapterViewHolder holder, final int position) {
        final Message message = messages.get(position);
        ConstraintLayout constraintLayoutMessageSent;
        int viewType = holder.getItemViewType();
        if (viewType == MSG_TYPE_LEFT) {
            holder.textViewChatName.setText(message.getName());
            holder.textViewChatMessage.setText(message.getMessage());
            holder.textViewChatMessageDate.setText(message.getHourminute());
            holder.imageViewChatUserProfile.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Intent intent = new Intent(context, UserProfileActivity.class);
                    intent.putExtra("username", message.getName());
                    context.startActivity(intent);
                }
            });
        } else {
            constraintLayoutMessageSent = holder.itemView.findViewById(R.id.constraintLayoutMessageSent);
            holder.textViewChatMessage.setText(message.getMessage());
            holder.textViewChatMessageDate.setText(message.getHourminute());
            holder.imageViewChatMessageStatus.setImageDrawable(ResourcesCompat.getDrawable(context.getResources(), R.drawable.ic_message_sent, null));
            constraintLayoutMessageSent.setOnLongClickListener(new View.OnLongClickListener() {
                @Override
                public boolean onLongClick(View v) {
                    AlertDialog.Builder builder = new AlertDialog.Builder(holder.itemView.getContext());
                    builder.setMessage(R.string.delete_message)
                            .setPositiveButton(R.string.yes, new DialogInterface.OnClickListener() {
                                @Override
                                public void onClick(DialogInterface dialogInterface, int i) {
                                    deleteMessage(position);
                                }
                            }).setNegativeButton(R.string.no, new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialogInterface, int which) {
                            dialogInterface.dismiss();
                        }
                    });
                    builder.create();
                    builder.show();
                    return false;
                }
            });
        }
    }
    private void deleteMessage(int position) {
        String messageKey = messages.get(position).getKey();
        DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference("Messages");
        databaseReference.child(messageKey).removeValue();
    }
    @Override
    public int getItemCount() {
        return messages.size();
    }
    public static class MessageAdapterViewHolder extends RecyclerView.ViewHolder {
        private TextView textViewChatMessage;
        private TextView textViewChatName;
        private TextView textViewChatMessageDate;
        private ImageView imageViewChatMessageStatus;
        private ImageView imageViewChatUserProfile;
        public MessageAdapterViewHolder(@NonNull final View itemView) {
            super(itemView);
            textViewChatName = itemView.findViewById(R.id.textViewChatName);
            textViewChatMessage = itemView.findViewById(R.id.textViewChatMessage);
            textViewChatMessageDate = itemView.findViewById(R.id.textViewChatMessageDate);
            imageViewChatMessageStatus = itemView.findViewById(R.id.imageViewChatMessageStatus);
            imageViewChatUserProfile = itemView.findViewById(R.id.imageViewChatUserProfile);
        }
    }
}

    public class UserProfileActivity extends AppCompatActivity {
private Context context;
private Toolbar toolbar;
private String username = "";
private ImageView imageViewUserProfileProfile;
private TextView textViewUserProfileName;
private TextView textViewUserProfileDescription;
private ConstraintLayout loadingLayout;
private LottieAnimationView lottieAnimationViewLoading;
private RecyclerView recyclerViewUserProfileComments;
private TextView textViewUserProfileNoComments;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_user_profile);
username = getIntent().getStringExtra("username");
context = getApplicationContext();
toolbar = findViewById(R.id.toolbarUserProfile);
// TODO set the title of the user profile visiting.
setSupportActionBar(toolbar);
Objects.requireNonNull(getSupportActionBar()).setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
onBackPressed();
}
});
bindUI();
}
private void bindUI() {
loadingLayout = findViewById(R.id.loadingLayout);
lottieAnimationViewLoading = findViewById(R.id.lottieAnimationViewLoading);
imageViewUserProfileProfile = findViewById(R.id.imageViewUserProfileProfile);
textViewUserProfileName = findViewById(R.id.textViewUserProfileName);
textViewUserProfileDescription = findViewById(R.id.textViewUserProfileDescription);
recyclerViewUserProfileComments = findViewById(R.id.recyclerViewUserProfileComments);
textViewUserProfileNoComments = findViewById(R.id.textViewUserProfileNoComments);
getUserInformation();
getUserComments();
}
private void getUserInformation() {
loadingLayout.setVisibility(View.VISIBLE);
Thread thread = new Thread() {
@Override
public void run() {
try {
String description = "";
String gender = "";
String profile_picture = "";
Response response = HttpRequests.getUserInformation(username);
String responseBody = Objects.requireNonNull(response.body()).string();
responseBody = responseBody.replace("\r\n", "");
JSONArray responseArray = new JSONArray(responseBody);
for (int i = 0; i < responseArray.length(); i++) {
JSONObject jsonobject = responseArray.getJSONObject(i);
description = jsonobject.getString("description");
gender = jsonobject.getString("gender");
profile_picture = jsonobject.getString("profile_picture");
updateUI(description, gender, profile_picture);
}
} catch (IOException | JSONException e) {
showErrors();
e.printStackTrace();
}
}
};
thread.start();
}
private void getUserComments() {
loadingLayout.setVisibility(View.VISIBLE);
Thread thread = new Thread() {
@Override
public void run() {
try {
List<Message> userMessageList = new ArrayList<>();
String name = "";
String comment = "";
Response response = HttpRequests.getUserComments(username);
String responseBody = Objects.requireNonNull(response.body()).string();
responseBody = responseBody.replace("\r\n", "");
JSONArray responseArray = new JSONArray(responseBody);
for (int i = 0; i < responseArray.length(); i++) {
Message message = new Message();
JSONObject jsonobject = responseArray.getJSONObject(i);
name = jsonobject.getString("from_user");
comment = jsonobject.getString("comment");
if (!name.isEmpty() && !comment.isEmpty()) {
message.setName(name);
message.setMessage(comment);
userMessageList.add(message);
}
}
if (userMessageList.size() > 0) {
updateComments(userMessageList);
}else{
updateCommentSection();
}
} catch (IOException | JSONException e) {
showErrors();
updateCommentSection();
e.printStackTrace();
}
}
};
thread.start();
}
private void showErrors() {
Thread thread = new Thread() {
public void run() {
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(context, getString(R.string.generic_error), Toast.LENGTH_LONG).show();
}
});
}
};
thread.start();
}
private void updateUI(final String description, final String gender, final String pictureURL) {
Thread thread = new Thread() {
public void run() {
runOnUiThread(new Runnable() {
public void run() {
//Picasso.get()
//        .load(pictureURL)
//        .memoryPolicy(MemoryPolicy.NO_CACHE, MemoryPolicy.NO_STORE)
//        .into(imageViewUserProfileProfile);
toolbar.setTitle(username + " - " + getString(R.string.user_profile));
textViewUserProfileName.setText(username);
if (description.equals("null")) {
textViewUserProfileDescription.setText("");
} else {
textViewUserProfileDescription.setText(description);
}
loadingLayout.setVisibility(View.GONE);
lottieAnimationViewLoading.cancelAnimation();
}
});
}
};
thread.start();
}
private void updateComments(final List<Message> userMessageList) {
Thread thread = new Thread() {
public void run() {
runOnUiThread(new Runnable() {
public void run() {
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(context);
linearLayoutManager.setStackFromEnd(true);
recyclerViewUserProfileComments.setLayoutManager(linearLayoutManager);
MessageAdapter messageAdapter = new MessageAdapter(context, userMessageList);
recyclerViewUserProfileComments.setAdapter(messageAdapter);
messageAdapter.notifyDataSetChanged();
recyclerViewUserProfileComments.scrollToPosition(userMessageList.size() - 1);
loadingLayout.setVisibility(View.GONE);
}
});
}
};
thread.start();
}
private void updateCommentSection() {
Thread thread = new Thread() {
public void run() {
runOnUiThread(new Runnable() {
public void run() {
recyclerViewUserProfileComments.setVisibility(View.GONE);
textViewUserProfileNoComments.setVisibility(View.VISIBLE);
loadingLayout.setVisibility(View.GONE);
}
});
}
};
thread.start();
}
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/linearLayoutChatParent"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="6dp"
android:layout_marginEnd="16dp"
android:layout_marginBottom="6dp"
android:orientation="horizontal">
<ImageView
android:id="@+id/imageViewChatUserProfile"
android:layout_width="50sp"
android:layout_height="50sp"
android:layout_marginEnd="5dp"
android:background="@drawable/circle"
android:padding="5dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="@drawable/ic_person_blue" />
<androidx.constraintlayout.widget.ConstraintLayout
android:id="@+id/constraintLayoutMessageItem"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/message_received_background"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<TextView
android:id="@+id/textViewChatName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:fontFamily="@font/among_us_font"
android:padding="5dp"
android:textAppearance="?attr/textAppearanceListItem"
android:textColor="@android:color/black"
android:textStyle="bold"
app:layout_constraintBottom_toTopOf="@+id/textViewChatMessage"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:text="Administrator" />
<TextView
android:id="@+id/textViewChatMessage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="4dp"
android:layout_marginBottom="8dp"
android:fontFamily="@font/among_us_font"
android:padding="5dp"
android:textAppearance="?attr/textAppearanceListItem"
android:textColor="@android:color/black"
app:layout_constrainedWidth="true"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@+id/textViewChatMessageDate"
app:layout_constraintStart_toStartOf="@+id/textViewChatName"
app:layout_constraintTop_toBottomOf="@+id/textViewChatName"
tools:text="This is a test message This is a test This is a test message" />
<TextView
android:id="@+id/textViewChatMessageDate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:fontFamily="@font/among_us_font"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:text="12:20" />
</androidx.constraintlayout.widget.ConstraintLayout>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/constraintLayoutMessageSent"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="16dp"
android:layout_marginBottom="8dp">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/message_sent_background"
android:fontFamily="@font/among_us_font"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent">
<TextView
android:id="@+id/textViewChatMessage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="4dp"
android:layout_marginBottom="8dp"
android:fontFamily="@font/among_us_font"
android:padding="5dp"
android:textAppearance="?attr/textAppearanceListItem"
android:textColor="@android:color/black"
app:layout_constrainedWidth="true"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@+id/textViewChatMessageDate"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:text="Test message sent!" />
<TextView
android:id="@+id/textViewChatMessageDate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="4dp"
android:fontFamily="@font/among_us_font"
app:layout_constraintBottom_toBottomOf="@+id/imageViewChatMessageStatus"
app:layout_constraintEnd_toStartOf="@+id/imageViewChatMessageStatus"
app:layout_constraintStart_toEndOf="@+id/textViewChatMessage"
app:layout_constraintTop_toTopOf="@+id/imageViewChatMessageStatus"
tools:text="12:02" />
<ImageView
android:id="@+id/imageViewChatMessageStatus"
android:layout_width="18sp"
android:layout_height="18sp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="@drawable/ic_message_waiting" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.constraintlayout.widget.ConstraintLayout>