Firebase Reatime Database

Firebase

Firebase is realtime  database hosted on cloud. It is no SQL database, It means data is store in the form of json and synchronised in realtime with every connected client.Firebase also supports offline mode, writing database changes to a local database before sending them off to the firebase server for synchronization with other devices.

When to use :

When the situation comes to save data on a Realtime basis to a server. We have to create server side database(MySQL, Oracle) with programming language(PHP,Java, .Net etc.) and have to create  APIs  to store and retrieve data from database.

Why we use :

• No need to extra code and easy to implement
• Directly communicate with firebase without any APIs
• Automatically update the database

Creating Firebase Project

 1) First got to https://firebase.google.com/  and  click "GET STARTED FOR FREE" make an                  account and create your first project.

 2) After creating account it redirects you to firebase console. click on "Add Project". A dialog will          open and enter project name and country. click on "Create Project".

3) After creating project, it redirect to firebase console page and click there on "Add firebase to your       android app"

4) Here enter the package name of firebase app and you can also enter the nickname and SHA1 but it     is not compulsory.

5) Click on REGISTER APP and download google-service.json file.

6) click on FINISH.

Create Android Studio Project

1. create a new project in Android studio. File -> New Project use the same package name that you         have put in firebase app.
2. Copy the google-services.json file that you have download from firebase console  paste it in app           folder.
3. Open the build.gradle of project level and add the google dependency
 

build.gradle

dependencies {         classpath 'com.android.tools.build:gradle:2.2.0'         classpath 'com.google.gms:google-services:3.0.0'         // NOTE: Do not place your application dependencies here; they belong         // in the individual module build.gradle files     } 4. Open app->build.gradle and add firebase database dependency.At the very bottom of the file, apply plugin dependencies {     // Adding support library for this demo app     compile 'com.android.support:design:24.2.1'     compile 'com.google.firebase:firebase-database:9.6.1' } apply plugin: 'com.google.gms.google-services'

Rules for Firebase Database

Firebase console provide you to set a set of rules to secure the database.

You can set the rules if you want to read and write the data only authorised user.

{

  "rules": {

    ".read": "auth != null",

    ".write": "auth != null"

  }

}




You can set the rules if you want to read and write the data all the  user.

{ "rules": { ".read": true, ".write": true } }

Initialize  the Firebase database

First you have to initilialize the DatabaseReference  reference. This will gives you reference to database JSON top node. From here you can use your child node names. 

DatabaseReference databasePlayers;

databasePlayers = FirebaseDatabase.getInstance().getReference("players");

Insert Data in Database

The are two method to insert data to firebase. push() and setValue().

push() - push() method is used to generate unique Id, it creates an empty node with unique key.

setValue() - setValue() method used to inset data as child node in top level JSON. To get the reference of top node you can get by child() method, then  you use setValue() method to store the user data.



String id =databasePlayers.push().getKey();
databasePlayers.child(id).setValue(model);



Retrieve the data from Firebase

To retrieve the data from database, you have to add ValueEventListener to database reference. Tis event will triggered when you change the value in realtime database. OnDatachanged()  method will call.

	databasePlayers.addValueEventListener(new ValueEventListener() { @Override
	public void onDataChange(DataSnapshot snapshot) {
	playerlist.clear();
	for (DataSnapshot postSnapshot : snapshot.getChildren()) {
	if(postSnapshot != null) {
	String parentid = postSnapshot.getKey();
	PlayerModel model = postSnapshot.getValue(PlayerModel.class);
	/////parse the single parameters//////////////
	int p_id = model.getP_id();
	String image = model.getPlayerImage();
	String name = model.getPlayer_name();
	String match = model.getPlayer_match();
	String inning = model.getPlayer_inning();
	String run = model.getPlayer_run();
	String wicket = model.getPlayer_wicket();
	String bestRun = model.getPlayer_bestRun();
	String bestBowling = model.getPlayer_bestBowling();
	String avg = model.getAverage();
	model.setParentid(parentid);
	playerlist.add(model);
	adapter = new PlayerRecyclerAdapter(MainActivity.this,playerlist);
	recyclerView.setAdapter(adapter);
	}

Update the data from firebase database

To update the value you  have use setValue() method with database reference and child method to find the node and setValue() method add the value in that node.

databasePlayers.child(id).setValue(model);


Delete the data from Firebase database

To delete the value you have to use removeValue() method.

Complete project code

layout/activity_main.xml

	<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	xmlns:tools="http://schemas.android.com/tools"
	android:id="@+id/activity_main"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:orientation="vertical"
	tools:context="com.androdheight.firebase.MainActivity">
	<LinearLayout
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:orientation="vertical">
	<TextView
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:text="Enter the Player details"
	/>
	<LinearLayout
	android:layout_width="match_parent"
	android:layout_height="wrap_content">
	<android.support.design.widget.TextInputLayout
	android:id="@+id/playername"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:layout_weight="1">
	<EditText
	android:id="@+id/etplayername"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:hint="Player Name" />
	</android.support.design.widget.TextInputLayout>
	<android.support.design.widget.TextInputLayout
	android:id="@+id/playermatch"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:layout_weight="1">
	<EditText
	android:id="@+id/etplayermatch"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:hint="Match" />
	</android.support.design.widget.TextInputLayout>
	</LinearLayout>
	<LinearLayout
	android:layout_width="match_parent"
	android:layout_height="wrap_content">
	<android.support.design.widget.TextInputLayout
	android:id="@+id/playerinning"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:layout_weight="1">
	<EditText
	android:id="@+id/etplayerinning"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:hint="Inning" />
	</android.support.design.widget.TextInputLayout>
	<android.support.design.widget.TextInputLayout
	android:id="@+id/playerrun"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:layout_weight="1">
	<EditText
	android:id="@+id/etplayerrun"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:hint="Run" />
	</android.support.design.widget.TextInputLayout>
	<android.support.design.widget.TextInputLayout
	android:id="@+id/playerwicket"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:layout_weight="1">
	<EditText
	android:id="@+id/etplayerwicket"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:hint="Wicket" />
	</android.support.design.widget.TextInputLayout>
	</LinearLayout>
	<LinearLayout
	android:layout_width="match_parent"
	android:layout_height="wrap_content">
	<android.support.design.widget.TextInputLayout
	android:id="@+id/playerBestRun"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:layout_weight="1">
	<EditText
	android:id="@+id/etplayerBestRun"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:hint="Best Run" />
	</android.support.design.widget.TextInputLayout>
	<android.support.design.widget.TextInputLayout
	android:id="@+id/playerbestbowling"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:layout_weight="1">
	<EditText
	android:id="@+id/etplayerbestbowling"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:hint="Best Bowling" />
	</android.support.design.widget.TextInputLayout>
	<android.support.design.widget.TextInputLayout
	android:id="@+id/playerAvg"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:layout_weight="1">
	<EditText
	android:id="@+id/etplayerAvg"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:hint="Average" />
	</android.support.design.widget.TextInputLayout>
	</LinearLayout>
	<Button
	android:id="@+id/btnSubmit"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:layout_gravity="center"
	android:text="Submit"/>
	</LinearLayout>
	<android.support.v7.widget.RecyclerView
	android:id="@+id/rvPlayerlist"
	android:layout_width="match_parent"
	android:layout_height="match_parent"/>
	</LinearLayout>

layout/player_item_list.xml

	<TableLayout android:stretchColumns="*" android:layout_height="wrap_content"
	android:layout_width="fill_parent"
	xmlns:android="http://schemas.android.com/apk/res/android">
	<TableRow android:layout_height="wrap_content"
	android:layout_width="wrap_content"
	android:paddingBottom="5dp"
	android:paddingTop="5dp"
	android:background="#EAE9E9"
	android:layout_margin="1px"
	android:id="@+id/tableRow1">
	<TextView android:layout_height="wrap_content"
	android:layout_width="0dp"
	android:id="@+id/tv_Name"
	android:text="N"
	android:textColor="#333333"
	android:textSize="11sp"
	android:gravity="center"
	android:textStyle="bold"
	android:layout_weight="1"/>
	<TextView android:layout_height="wrap_content"
	android:layout_width="0dp"
	android:id="@+id/tv_Match"
	android:text="M"
	android:textColor="#333333"
	android:textSize="11sp"
	android:gravity="center"
	android:textStyle="bold"
	android:layout_weight="1"/>
	<TextView android:layout_height="wrap_content"
	android:layout_width="0dp"
	android:id="@+id/tv_Inning"
	android:text="I"
	android:textColor="#333333"
	android:textSize="11sp"
	android:gravity="center"
	android:textStyle="bold"
	android:layout_weight="1"/>
	<TextView android:layout_height="wrap_content"
	android:layout_width="0dp"
	android:id="@+id/tv_Run"
	android:text="R"
	android:textColor="#333333"
	android:textSize="11sp"
	android:gravity="center"
	android:textStyle="bold"
	android:layout_weight="1"/>
	<TextView android:layout_height="wrap_content"
	android:layout_width="0dp"
	android:id="@+id/tv_Wicket"
	android:text="W"
	android:textColor="#333333"
	android:textSize="11sp"
	android:gravity="center"
	android:textStyle="bold"
	android:layout_weight="1"/>
	<TextView android:layout_height="wrap_content"
	android:layout_width="0dp"
	android:id="@+id/tv_BestRun"
	android:text="BR"
	android:textColor="#333333"
	android:textSize="11sp"
	android:gravity="center"
	android:textStyle="bold"
	android:layout_weight="1"/>
	<TextView android:layout_height="wrap_content"
	android:layout_width="0dp"
	android:id="@+id/tv_BestBowling"
	android:text="BB"
	android:textColor="#333333"
	android:textSize="11sp"
	android:gravity="center"
	android:textStyle="bold"
	android:layout_weight="1"/>
	<TextView android:layout_height="wrap_content"
	android:layout_width="0dp"
	android:id="@+id/tv_Average"
	android:text="A"
	android:textColor="#333333"
	android:textSize="11sp"
	android:gravity="center"
	android:textStyle="bold"
	android:layout_weight="1"/>
	</TableRow>
	</TableLayout>

layout/player_item_list_header.xml

	<TableLayout android:stretchColumns="*" android:layout_height="wrap_content"
	android:layout_width="fill_parent"
	xmlns:android="http://schemas.android.com/apk/res/android">
	<TableRow android:layout_height="wrap_content"
	android:layout_width="wrap_content"
	android:paddingBottom="5dp"
	android:paddingTop="5dp"
	android:background="#EAE9E9"
	android:layout_margin="1px"
	android:id="@+id/tableRow1">
	<TextView android:layout_height="wrap_content"
	android:layout_width="0dp"
	android:id="@+id/tv_RowHeader1"
	android:text="N"
	android:textColor="#333333"
	android:textSize="11sp"
	android:gravity="center"
	android:textStyle="bold"
	android:layout_weight="1"/>
	<TextView android:layout_height="wrap_content"
	android:layout_width="0dp"
	android:id="@+id/tv_RowHeader2"
	android:text="M"
	android:textColor="#333333"
	android:textSize="11sp"
	android:gravity="center"
	android:textStyle="bold"
	android:layout_weight="1"/>
	<TextView android:layout_height="wrap_content"
	android:layout_width="0dp"
	android:id="@+id/tv_RowHeader3"
	android:text="I"
	android:textColor="#333333"
	android:textSize="11sp"
	android:gravity="center"
	android:textStyle="bold"
	android:layout_weight="1"/>
	<TextView android:layout_height="wrap_content"
	android:layout_width="0dp"
	android:id="@+id/tv_RowHeader4"
	android:text="R"
	android:textColor="#333333"
	android:textSize="11sp"
	android:gravity="center"
	android:textStyle="bold"
	android:layout_weight="1"/>
	<TextView android:layout_height="wrap_content"
	android:layout_width="0dp"
	android:id="@+id/tv_RowHeader5"
	android:text="W"
	android:textColor="#333333"
	android:textSize="11sp"
	android:gravity="center"
	android:textStyle="bold"
	android:layout_weight="1"/>
	<TextView android:layout_height="wrap_content"
	android:layout_width="0dp"
	android:id="@+id/tv_RowHeader6"
	android:text="BR"
	android:textColor="#333333"
	android:textSize="11sp"
	android:gravity="center"
	android:textStyle="bold"
	android:layout_weight="1"/>
	<TextView android:layout_height="wrap_content"
	android:layout_width="0dp"
	android:id="@+id/tv_RowHeader7"
	android:text="BB"
	android:textColor="#333333"
	android:textSize="11sp"
	android:gravity="center"
	android:textStyle="bold"
	android:layout_weight="1"/>
	<TextView android:layout_height="wrap_content"
	android:layout_width="0dp"
	android:id="@+id/tv_RowHeader8"
	android:text="A"
	android:textColor="#333333"
	android:textSize="11sp"
	android:gravity="center"
	android:textStyle="bold"
	android:layout_weight="1"/>
	</TableRow>
	</TableLayout>

model/PlayerModel.java  

	package com.androdheight.firebase.model; import java.io.Serializable;
	/**
	* Created by prabhakar on 11/04/17.
	*/
	public class PlayerModel implements Serializable{
	private String playerImage;
	private String parentid;
	private int p_id;
	private String player_name;
	private String player_match;
	private String player_inning;
	private String player_run;
	private String player_wicket;
	private String player_bestRun;
	private String player_bestBowling;
	private String average;
	public int getP_id() {
	return p_id;
	}
	public void setP_id(int p_id) {
	this.p_id = p_id;
	}
	public String getPlayer_name() {
	return player_name;
	}
	public void setPlayer_name(String player_name) {
	this.player_name = player_name;
	}
	public String getPlayer_match() {
	return player_match;
	}
	public void setPlayer_match(String player_match) {
	this.player_match = player_match;
	}
	public String getPlayer_inning() {
	return player_inning;
	}
	public void setPlayer_inning(String player_inning) {
	this.player_inning = player_inning;
	}
	public String getPlayer_run() {
	return player_run;
	}
	public void setPlayer_run(String player_run) {
	this.player_run = player_run;
	}
	public String getPlayer_wicket() {
	return player_wicket;
	}
	public void setPlayer_wicket(String player_wicket) {
	this.player_wicket = player_wicket;
	}
	public String getPlayer_bestRun() {
	return player_bestRun;
	}
	public void setPlayer_bestRun(String player_bestRun) {
	this.player_bestRun = player_bestRun;
	}
	public String getPlayer_bestBowling() {
	return player_bestBowling;
	}
	public void setPlayer_bestBowling(String player_bestBowling) {
	this.player_bestBowling = player_bestBowling;
	}
	public String getAverage() {
	return average;
	}
	public void setAverage(String average) {
	this.average = average;
	}
	public String getPlayerImage() {
	return playerImage;
	}
	public void setPlayerImage(String playerImage) {
	this.playerImage = playerImage;
	}
	public String getParentid() {
	return parentid;
	}
	public void setParentid(String parentid) {
	this.parentid = parentid;
	}
	}

Adapter/PlayerRecyclerAdapter.java

	package com.androdheight.firebase.adapter; import android.content.Context;
	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.androdheight.firebase.MainActivity;
	import com.androdheight.firebase.R;
	import com.androdheight.firebase.model.PlayerModel;
	import java.util.ArrayList;
	/**
	* Created by prabhakar on 11/04/17.
	*/
	public class PlayerRecyclerAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
	private static final int TYPE_HEADER = 0;
	private static final int TYPE_ITEM = 1;
	private ArrayList<PlayerModel> playerlist;
	Context context;
	static OnListItemClickListener listItemClickListener;
	public interface OnListItemClickListener{
	public void onItemClickL(View view, int position);
	}
	public class MyViewHolder extends RecyclerView.ViewHolder {
	TextView tv_Name,tv_Match,tv_Inning,tv_Run,tv_Wicket,tv_BestRun,tv_BestBowling,tv_Average;
	public MyViewHolder(final View itemView) {
	super(itemView);
	tv_Name = (TextView) itemView.findViewById(R.id.tv_Name);
	tv_Match = (TextView) itemView.findViewById(R.id.tv_Match);
	tv_Inning = (TextView) itemView.findViewById(R.id.tv_Inning);
	tv_Run = (TextView) itemView.findViewById(R.id.tv_Run);
	tv_Wicket = (TextView) itemView.findViewById(R.id.tv_Wicket);
	tv_BestRun = (TextView) itemView.findViewById(R.id.tv_BestRun);
	tv_BestBowling = (TextView) itemView.findViewById(R.id.tv_BestBowling);
	tv_Average = (TextView) itemView.findViewById(R.id.tv_Average);
	itemView.setOnClickListener(new View.OnClickListener() {
	@Override
	public void onClick(View view) {
	listItemClickListener.onItemClickL(itemView,getAdapterPosition());
	}
	});
	}
	}
	class MyViewHolderHeader extends RecyclerView.ViewHolder{
	public MyViewHolderHeader(View itemView) {
	super(itemView);
	}
	}
	private PlayerModel getItem (int position) {
	return playerlist.get (position);
	}
	public PlayerRecyclerAdapter(Context context,ArrayList<PlayerModel> playerlist) {
	listItemClickListener= (MainActivity) context;
	this.context = context;
	this.playerlist = playerlist;
	}
	@Override
	public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent,
	int viewType) {
	if (viewType == TYPE_HEADER) {
	View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.player_item_list_header, parent, false);
	return new MyViewHolderHeader(v);
	} else if (viewType == TYPE_ITEM) {
	View view = LayoutInflater.from(parent.getContext())
	.inflate(R.layout.player_item_list, parent, false);
	MyViewHolder myViewHolder = new MyViewHolder(view);
	return myViewHolder;
	}
	return null;
	}
	@Override
	public void onBindViewHolder( RecyclerView.ViewHolder viewHolder, int listPosition) {
	if(viewHolder instanceof MyViewHolder) {
	// PlayerModel currentItem = getItem (listPosition - 1);
	MyViewHolder holder = (MyViewHolder) viewHolder;
	holder.tv_Name.setText(playerlist.get(listPosition-1).getPlayer_name());
	holder.tv_Match.setText(playerlist.get(listPosition-1).getPlayer_match());
	holder.tv_Inning.setText(playerlist.get(listPosition-1).getPlayer_inning());
	holder.tv_Run.setText(playerlist.get(listPosition-1).getPlayer_run());
	holder.tv_Wicket.setText(playerlist.get(listPosition-1).getPlayer_wicket());
	holder.tv_BestRun.setText(playerlist.get(listPosition-1).getPlayer_bestRun());
	holder.tv_BestBowling.setText(playerlist.get(listPosition-1).getPlayer_bestBowling());
	holder.tv_Average.setText(playerlist.get(listPosition-1).getAverage());
	}
	}
	@Override
	public int getItemViewType (int position) {
	if(isPositionHeader (position)) {
	return TYPE_HEADER;
	}
	return TYPE_ITEM;
	}
	private boolean isPositionHeader (int position) {
	return position == 0;
	}
	@Override
	public int getItemCount() {
	return playerlist.size()+1;
	}
	}

MainActivity.java

	package com.androdheight.firebase; import android.content.Intent;
	import android.support.v7.app.AppCompatActivity;
	import android.os.Bundle;
	import android.support.v7.widget.LinearLayoutManager;
	import android.support.v7.widget.RecyclerView;
	import android.view.View;
	import android.widget.Button;
	import android.widget.EditText;
	import android.widget.TextView;
	import android.widget.Toast;
	import com.androdheight.firebase.adapter.PlayerRecyclerAdapter;
	import com.androdheight.firebase.model.PlayerModel;
	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 java.util.ArrayList;
	public class MainActivity extends AppCompatActivity implements PlayerRecyclerAdapter.OnListItemClickListener{
	private static RecyclerView.Adapter adapter;
	private RecyclerView.LayoutManager layoutManager;
	private static RecyclerView recyclerView;
	private static ArrayList<PlayerModel> playerlist;
	private EditText etplayername,etplayermatch,etplayerinning,etplayerrun,
	etplayerwicket,playerBestRun,etplayerbestbowling,etplayerAvg;
	private Button btnSubmit;
	DatabaseReference databasePlayers;
	String id;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_main);
	databasePlayers = FirebaseDatabase.getInstance().getReference("players");
	initilize();
	playerlist = new ArrayList<PlayerModel>();
	btnSubmit.setOnClickListener(new View.OnClickListener() {
	@Override
	public void onClick(View v) {
	getFieldsValue();
	}
	});
	// specify an adapter (see also next example)
	}
	private void initilize(){
	etplayername = (EditText)findViewById(R.id.etplayername);
	etplayermatch = (EditText)findViewById(R.id.etplayermatch);
	etplayerinning = (EditText)findViewById(R.id.etplayerinning);
	etplayerrun = (EditText)findViewById(R.id.etplayerrun);
	etplayerwicket = (EditText)findViewById(R.id.etplayerwicket);
	playerBestRun = (EditText)findViewById(R.id.etplayerBestRun);
	etplayerbestbowling = (EditText)findViewById(R.id.etplayerbestbowling);
	etplayerAvg = (EditText)findViewById(R.id.etplayerAvg);
	btnSubmit =(Button)findViewById(R.id.btnSubmit);
	recyclerView = (RecyclerView)findViewById(R.id.rvPlayerlist);
	recyclerView.setHasFixedSize(true);
	// use a linear layout manager
	layoutManager = new LinearLayoutManager(this);
	recyclerView.setLayoutManager(layoutManager);
	//////////////////retrieve the value//////////////
	databasePlayers.addValueEventListener(new ValueEventListener() {
	@Override
	public void onDataChange(DataSnapshot snapshot) {
	playerlist.clear();
	for (DataSnapshot postSnapshot : snapshot.getChildren()) {
	if(postSnapshot != null) {
	String parentid = postSnapshot.getKey();
	PlayerModel model = postSnapshot.getValue(PlayerModel.class);
	/////parse the single parameters//////////////
	int p_id = model.getP_id();
	String image = model.getPlayerImage();
	String name = model.getPlayer_name();
	String match = model.getPlayer_match();
	String inning = model.getPlayer_inning();
	String run = model.getPlayer_run();
	String wicket = model.getPlayer_wicket();
	String bestRun = model.getPlayer_bestRun();
	String bestBowling = model.getPlayer_bestBowling();
	String avg = model.getAverage();
	model.setParentid(parentid);
	playerlist.add(model);
	adapter = new PlayerRecyclerAdapter(MainActivity.this,playerlist);
	recyclerView.setAdapter(adapter);
	}
	}
	}
	@Override
	public void onCancelled(DatabaseError databaseError) {
	System.out.println("The read failed: " + databaseError.getMessage());
	}
	});
	}
	private void getFieldsValue(){
	int p_id = playerlist.size();
	String name = etplayername.getText().toString();
	String match = etplayermatch.getText().toString();
	String inning = etplayerinning.getText().toString();
	String run = etplayerrun.getText().toString();
	String wicket = etplayerwicket.getText().toString();
	String bestRun = playerBestRun.getText().toString();
	String bestBowling = etplayerbestbowling.getText().toString();
	String avg = etplayerAvg.getText().toString();
	//////////insert the value in firebase database////////////////////
	id =databasePlayers.push().getKey();
	PlayerModel model = new PlayerModel();
	model.setPlayerImage("");
	model.setPlayer_name(name);
	model.setPlayer_match(match);
	model.setPlayer_inning(inning);
	model.setPlayer_run(run);
	model.setPlayer_wicket(wicket);
	model.setPlayer_bestRun(bestRun);
	model.setPlayer_bestBowling(bestBowling);
	model.setAverage(avg);
	model.setParentid(id);
	databasePlayers.child(id).setValue(model);
	Toast.makeText(this,"Playes added",Toast.LENGTH_LONG).show();
	////retrieve data from firebase database//////////////
	//Value event listener for realtime data update
	/*adapter = new PlayerRecyclerAdapter(this,playerlist);
	recyclerView.setAdapter(adapter);*/
	}
	@Override
	public void onItemClickL(View view, int position) {
	Bundle bundle = new Bundle();
	bundle.putSerializable("player",playerlist.get(position-1));
	Intent i= new Intent(MainActivity.this,UpdatePlayerActivity.class);
	i.putExtras(bundle);
	startActivity(i);
	}
	}

Screenshot

  

Get the full source code from Github

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