As now i am working on a chat application, here i have a problem that how can i display my last recent chat on the top of the recyclerview in ChatlistFragment, for example if i had recently sent my last message to any user they have to displayed at the top of my recyclerview, here is my code
package com.micoder.whatsappclone;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.firebase.ui.database.FirebaseRecyclerAdapter;
import com.firebase.ui.database.FirebaseRecyclerOptions;
import com.github.clans.fab.FloatingActionButton;
import com.github.clans.fab.FloatingActionMenu;
import com.google.firebase.auth.FirebaseAuth;
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.ValueEventListener;
import com.squareup.picasso.Picasso;
import de.hdodenhof.circleimageview.CircleImageView;
public class ChatsFragment extends Fragment {
private View PrivateChatsView;
private RecyclerView chatsList;
private DatabaseReference ChatsRef, UsersRef;
private FirebaseAuth mAuth;
private String currentUserID;
FloatingActionMenu fabMenu;
FloatingActionButton fabSettings, fabShare, fabContactDev;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
PrivateChatsView = inflater.inflate(R.layout.fragment_chats, container, false);
mAuth = FirebaseAuth.getInstance();
currentUserID = mAuth.getCurrentUser().getUid();
ChatsRef = FirebaseDatabase.getInstance().getReference().child("Messages").child(currentUserID);
UsersRef = FirebaseDatabase.getInstance().getReference().child("Users");
chatsList = (RecyclerView) PrivateChatsView.findViewById(R.id.chats_list);
chatsList.setLayoutManager(new LinearLayoutManager(getContext()));
fabOptions();
return PrivateChatsView;
}
@Override
public void onStart() {
super.onStart();
FirebaseRecyclerOptions<Contacts> options =
new FirebaseRecyclerOptions.Builder<Contacts>()
.setQuery(ChatsRef, Contacts.class)
.build();
FirebaseRecyclerAdapter<Contacts, ChatsViewHolder> adapter =
new FirebaseRecyclerAdapter<Contacts, ChatsViewHolder>(options) {
@Override
protected void onBindViewHolder(@NonNull ChatsViewHolder holder, int position, @NonNull Contacts model) {
final String usersIDs = getRef(position).getKey();
final String[] retImage = {"default_image"};
UsersRef.child(usersIDs).addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if (dataSnapshot.child("userState").hasChild("state")) {
String state = dataSnapshot.child("userState").child("state").getValue().toString();
if (state.equals("online")) {
holder.onlineIcon.setVisibility(View.VISIBLE);
}
else if (state.equals("offline")) {
holder.onlineIcon.setVisibility(View.INVISIBLE);
}
}
else {
holder.onlineIcon.setVisibility(View.INVISIBLE);
}
if (dataSnapshot.exists()) {
if (dataSnapshot.hasChild("image")) {
retImage[0] = dataSnapshot.child("image").getValue().toString();
Picasso.get().load(retImage[0]).placeholder(R.drawable.profile_image).into(holder.profileImage);
}
final String retName = dataSnapshot.child("name").getValue().toString();
holder.userName.setText(retName);
if (dataSnapshot.child("userState").hasChild("state")) {
String state = dataSnapshot.child("userState").child("state").getValue().toString();
String date = dataSnapshot.child("userState").child("date").getValue().toString();
String time = dataSnapshot.child("userState").child("time").getValue().toString();
if (state.equals("online")) {
holder.userStatus.setText("online");
}
else if (state.equals("offline")) {
holder.userStatus.setText("Last Seen: " + date + " " + time);
}
}
else {
holder.userStatus.setText("offline");
}
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent chatIntent = new Intent(getContext(), ChatActivity.class);
chatIntent.putExtra("visit_user_id", usersIDs);
chatIntent.putExtra("visit_user_name", retName);
chatIntent.putExtra("visit_image", retImage[0]);
startActivity(chatIntent);
}
});
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
@NonNull
@Override
public ChatsViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.users_display_chats_layout, viewGroup, false);
return new ChatsViewHolder(view);
}
};
chatsList.setAdapter(adapter);
adapter.startListening();
}
public static class ChatsViewHolder extends RecyclerView.ViewHolder {
CircleImageView profileImage;
TextView userName, userStatus;
ImageView onlineIcon;
public ChatsViewHolder(@NonNull View itemView) {
super(itemView);
profileImage = itemView.findViewById(R.id.users_profile_image);
userName = itemView.findViewById(R.id.user_profile_name);
userStatus = itemView.findViewById(R.id.user_status);
onlineIcon = itemView.findViewById(R.id.user_online_status);
}
}
public void fabOptions() {
//FAB
fabMenu=PrivateChatsView.findViewById(R.id.fabMenu);
fabSettings=PrivateChatsView.findViewById(R.id.fabSettings);
fabContactDev=PrivateChatsView.findViewById(R.id.fabContactDev);
fabShare=PrivateChatsView.findViewById(R.id.fabShare);
fabShare.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
try {
Intent shareIntent = new Intent(Intent.ACTION_SEND);
shareIntent.setType("text/plain");
shareIntent.putExtra(Intent.EXTRA_SUBJECT, "My application name");
String shareMessage= "\nLet me recommend you this application\n\n";
shareMessage = shareMessage + "https://play.google.com/store/apps/developer?id=MI_CODER"+"\n\n";
shareIntent.putExtra(Intent.EXTRA_TEXT, shareMessage);
startActivity(Intent.createChooser(shareIntent, "choose one"));
} catch(Exception e) {
//e.toString();
}
fabMenu.close(true);
}
});
fabSettings.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(getActivity(), "Settings", Toast.LENGTH_SHORT).show();
startActivity(new Intent(getActivity(),SettingsActivity.class));
fabMenu.close(true);
}
});
fabContactDev.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(getActivity(),"Loading...",Toast.LENGTH_SHORT).show();
Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("https://micoder-dev.github.io/Resume-Page/"));
startActivity(browserIntent);
fabMenu.close(true);
}
});
}
}
if you need to refer my complete source code you can get here => https://github.com/Micoder-dev/ChatApp-FE-UI.git
I think this will help you to make it easier to get a solution.
