main_java_com_example_harsh_freechat_FriendsFragment.java

package com.example.harsh.freechat;


import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.AlertDialog;

import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import com.firebase.ui.database.FirebaseRecyclerAdapter;
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;


/**
 * A simple {@link Fragment} subclass.
 */
public class FriendsFragment extends Fragment {

    private RecyclerView mFriendsList;

    private DatabaseReference mFriendsDatabase;
     private DatabaseReference mUsersDatabase;

    private FirebaseAuth mAuth;

    private String mCurrent_user_id;

    private View mMainView;


    public FriendsFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        mMainView = inflater.inflate(R.layout.fragment_friends, container, false);

        mFriendsList = (RecyclerView) mMainView.findViewById(R.id.friends_list);
        mAuth = FirebaseAuth.getInstance();

        mCurrent_user_id = mAuth.getCurrentUser().getUid();

        mFriendsDatabase = FirebaseDatabase.getInstance().getReference().child("Friends").child(mCurrent_user_id);
         mFriendsDatabase.keepSynced(true);
         mUsersDatabase = FirebaseDatabase.getInstance().getReference().child("Users");
         mUsersDatabase.keepSynced(true);


        mFriendsList.setHasFixedSize(true);
        mFriendsList.setLayoutManager(new LinearLayoutManager(getContext()));

        // Inflate the layout for this fragment
        return mMainView;

    }

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

        FirebaseRecyclerAdapter<Friends, FriendsViewHolder> friendsRecyclerViewAdapter = new FirebaseRecyclerAdapter<Friends, FriendsViewHolder>(

                Friends.class,
                R.layout.users_single_layout,
                FriendsViewHolder.class,
                mFriendsDatabase


        ) {
            @Override
            protected void populateViewHolder(final FriendsViewHolder friendsViewHolder, final Friends friends, int i) {

                friendsViewHolder.setDate(friends.getDate());
                final String list_user_id=getRef(i).getKey();
                mUsersDatabase.child(list_user_id).addValueEventListener(new ValueEventListener() {
                    @Override
                    public void onDataChange(DataSnapshot dataSnapshot) {

                        final String userName = dataSnapshot.child("name").getValue().toString();
                        String userThumb = dataSnapshot.child("thumb_image").getValue().toString();

                        if (dataSnapshot.hasChild("online")) {

                            String userOnline = dataSnapshot.child("online").getValue().toString();
                            friendsViewHolder.setUserOnline(userOnline);
                        }

                        friendsViewHolder.setName(userName);
                        friendsViewHolder.setUserImage(userThumb, getContext());

                        friendsViewHolder.mView.setOnClickListener(new View.OnClickListener() {
                            @Override
                            public void onClick(View view) {

                                CharSequence options[]=new CharSequence[]{"Open Profile","Send Message"};
                                AlertDialog.Builder builder= new AlertDialog.Builder(getContext());
                                builder.setTitle("Select Options");
                                builder.setItems(options, new DialogInterface.OnClickListener() {
                                    @Override
                                    public void onClick(DialogInterface dialogInterface, int i) {

                                        //Click Event
                                        if(i==0){
                                            Intent profile_Intent=new Intent(getContext(),ProfileActivity.class);
                                            profile_Intent.putExtra("user_id", list_user_id);
                                            startActivity(profile_Intent);
                                        }
                                        if(i==1){

                                            Intent chat_Intent=new Intent(getContext(),ChatActivity.class);
                                            chat_Intent.putExtra("user_id", list_user_id);
                                            chat_Intent.putExtra("user_name",userName);
                                            startActivity(chat_Intent);
                                        }
                                    }
                                });
                                builder.show();
                            }
                        });

                    }

                    @Override
                    public void onCancelled(DatabaseError databaseError) {

                    }
                });





            }
        };
        mFriendsList.setAdapter(friendsRecyclerViewAdapter);
    }

            public static class FriendsViewHolder extends RecyclerView.ViewHolder {

                 View mView;

                public FriendsViewHolder(View itemView) {
                    super(itemView);

                    mView = itemView;

                }

                public void setDate(String date) {

                    TextView userStatusView = (TextView) mView.findViewById(R.id.users_single_status);
                    userStatusView.setText(date);

                }

                public void setName(String name) {

                    TextView userNameView=mView.findViewById(R.id.users_single_name);
                    userNameView.setText(name);
                }

                public  void setUserImage(String thumb_image, Context ctx)
                {
                    CircleImageView userImageView=mView.findViewById(R.id.users_single_image);
                    Picasso.with(ctx).load(thumb_image).placeholder(R.drawable.avatar).into(userImageView);
                }

                public void setUserOnline(String online_status)
                {
                    ImageView userOnlineView=mView.findViewById(R.id.user_single_online_icon);
                    if(online_status.equals("true"))
                    {
                        userOnlineView.setVisibility(View.VISIBLE);
                    }
                    else
                    {
                        userOnlineView.setVisibility(View.INVISIBLE);
                    }

                }



            }


        }