android Firebase Realtime database Query combinig orderbychild() with Start()
0
My database looks like this
What I want to do is I want to load first 6 item followed by next 5 item using below code
DatabaseReference noticeRefu = FirebaseDatabase.getInstance().getReference().child("noticeboard").child("posts");
Query noticeQuery = noticeRefu.orderByChild("timestamp").startAt("-1542128676980").limitToFirst(15);
if(!LastPostKey.equals(Lastmostkey))
noticeDatas.clear();
noticeQuery.addChildEventListener(new ChildEventListener()
@Override
public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
NoticeData n = dataSnapshot.getValue(NoticeData.class);
noticeDatas.add(n);
Log.d("texting","this is working inside"+ noticeDatas.size());
noticeAdapter.notifyDataSetChanged();
LastPostKey = dataSnapshot.getKey();
Log.d("texting","current Key after Change: "+ LastPostKey);
@Override
public void onChildChanged(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onChildRemoved(@NonNull DataSnapshot dataSnapshot)
@Override
public void onChildMoved(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onCancelled(@NonNull DatabaseError databaseError)
);
else
Toast.makeText(DashBoardActivity.this,"No more notice to load",Toast.LENGTH_LONG).show();
But nothing is showing up when I click loadmoredata button
Here is the full code
package com.nadim.csedashboard;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.design.widget.FloatingActionButton;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.AbsListView;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.Toast;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.ChildEventListener;
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.messaging.FirebaseMessaging;
import com.nadim.csedashboard.adapters.NoticeAdapter;
import com.nadim.csedashboard.dataset.NoticeData;
import java.util.ArrayList;
import java.util.List;
public class DashBoardActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener
String username = "";
String LastPostKey = "", Lastmostkey = "";
List<NoticeData> noticeDatas = new ArrayList<>();
NoticeAdapter noticeAdapter;
final int item = 5;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dash_board);
new InternetCheck(new InternetCheck.Consumer()
@Override
public void accept(Boolean internet)
if(internet)
FirebaseMessaging.getInstance().subscribeToTopic("notice").addOnSuccessListener(new OnSuccessListener<Void>()
@Override
public void onSuccess(Void aVoid)
Toast.makeText(getApplicationContext(),"subs to notice Success",Toast.LENGTH_LONG).show();
);
Toast.makeText(DashBoardActivity.this,"Internet Found", Toast.LENGTH_LONG).show();
else
Toast.makeText(DashBoardActivity.this,"Internet not Found", Toast.LENGTH_LONG).show();
);
FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
if (user != null)
username = "SignOut ("+user.getEmail()+")";
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
final ListView listViewnotice = findViewById(R.id.listView_notice);
DatabaseReference noticeRef = FirebaseDatabase.getInstance().getReference().child("noticeboard").child("posts");
Query noticeQuery = noticeRef.orderByChild("timestamp").limitToFirst(6);
noticeQuery.addChildEventListener(new ChildEventListener()
@Override
public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
NoticeData n = dataSnapshot.getValue(NoticeData.class);
noticeDatas.add(n);
noticeAdapter.notifyDataSetChanged();
LastPostKey = dataSnapshot.getKey();
//Toast.makeText(DashBoardActivity.this,"Current Key:"+LastPostKey,Toast.LENGTH_LONG).show();
Log.d("texting","current Key: "+ LastPostKey);
@Override
public void onChildChanged(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onChildRemoved(@NonNull DataSnapshot dataSnapshot)
@Override
public void onChildMoved(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onCancelled(@NonNull DatabaseError databaseError)
);
Query lastKey = noticeRef.orderByKey().limitToFirst(1);
lastKey.addChildEventListener(new ChildEventListener()
@Override
public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
Lastmostkey = dataSnapshot.getKey();
Log.d("texting","Last Key: "+ Lastmostkey);
@Override
public void onChildChanged(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onChildRemoved(@NonNull DataSnapshot dataSnapshot)
@Override
public void onChildMoved(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onCancelled(@NonNull DatabaseError databaseError)
);
noticeAdapter = new NoticeAdapter(this,noticeDatas);
listViewnotice.setAdapter(noticeAdapter);
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View loadMore = inflater.inflate(R.layout.more, null);
listViewnotice.addFooterView(loadMore);
Button loadmoredata = loadMore.findViewById(R.id.button_loadmore);
loadmoredata.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
Log.d("texting","this but is working inside"+ noticeDatas.size());
Log.d("texting","current Key after click: "+ LastPostKey);
Log.d("texting","last Key after click: "+ Lastmostkey);
DatabaseReference noticeRefu = FirebaseDatabase.getInstance().getReference().child("noticeboard").child("posts");
Query noticeQuery = noticeRefu.orderByChild("timestamp").startAt("-1542128676980").limitToFirst(noticeDatas.size() + 5 );
if(!LastPostKey.equals(Lastmostkey))
noticeQuery.addChildEventListener(new ChildEventListener()
@Override
public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
NoticeData n = dataSnapshot.getValue(NoticeData.class);
noticeDatas.add(n);
Log.d("texting","this is working inside"+ noticeDatas.size());
noticeAdapter.notifyDataSetChanged();
LastPostKey = dataSnapshot.getKey();
Log.d("texting","current Key after Change: "+ LastPostKey);
@Override
public void onChildChanged(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onChildRemoved(@NonNull DataSnapshot dataSnapshot)
@Override
public void onChildMoved(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onCancelled(@NonNull DatabaseError databaseError)
);
else
Toast.makeText(DashBoardActivity.this,"No more notice to load",Toast.LENGTH_LONG).show();
);
listViewnotice.setOnItemClickListener(new AdapterView.OnItemClickListener()
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l)
Intent intent = new Intent(DashBoardActivity.this,NoticeActivity.class);
intent.putExtra("dlimage",noticeDatas.get(i).getNotice_picture());
intent.putExtra("ntitle",noticeDatas.get(i).getNoticetitle());
startActivity(intent);
);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
Intent svc = new Intent(DashBoardActivity.this, ViewClass.class);
svc.putExtra("batchname","8thBatch");
//startService(svc);
startActivity(svc);
/*Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();*/
);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
@Override
public void onBackPressed()
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START))
drawer.closeDrawer(GravityCompat.START);
else
finishAffinity();
System.exit(0);
@Override
public boolean onCreateOptionsMenu(Menu menu)
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.dash_board, menu);
return true;
@Override
public boolean onPrepareOptionsMenu(Menu menu)
menu.findItem(R.id.action_logout).setTitle(username);
return super.onPrepareOptionsMenu(menu);
@Override
public boolean onOptionsItemSelected(MenuItem item)
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings)
Intent intent = new Intent(DashBoardActivity.this,UserProfile.class);
startActivity(intent);
return true;
if (id == R.id.action_logout)
FirebaseAuth.getInstance().signOut();
Intent intent = new Intent(DashBoardActivity.this,LoginActivity.class);
startActivity(intent);
Toast.makeText(DashBoardActivity.this, "Signed Out.",
Toast.LENGTH_LONG).show();
return true;
if (id == R.id.action_back)
onBackPressed();
return true;
return super.onOptionsItemSelected(item);
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item)
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_camera)
// Handle the camera action
else if (id == R.id.nav_gallery)
else if (id == R.id.nav_slideshow)
else if (id == R.id.nav_manage)
else if (id == R.id.nav_share)
else if (id == R.id.nav_send)
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
What should I do? Is there any way to load first 6 item followed by next 5 items? using timestamp child
java
android firebase edited Nov 14 '18 at 8:36
KENdi
5,8192821
asked Nov 13 '18 at 20:46
smnadim21smnadim21
11
add a comment |
0
My database looks like this
What I want to do is I want to load first 6 item followed by next 5 item using below code
DatabaseReference noticeRefu = FirebaseDatabase.getInstance().getReference().child("noticeboard").child("posts");
Query noticeQuery = noticeRefu.orderByChild("timestamp").startAt("-1542128676980").limitToFirst(15);
if(!LastPostKey.equals(Lastmostkey))
noticeDatas.clear();
noticeQuery.addChildEventListener(new ChildEventListener()
@Override
public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
NoticeData n = dataSnapshot.getValue(NoticeData.class);
noticeDatas.add(n);
Log.d("texting","this is working inside"+ noticeDatas.size());
noticeAdapter.notifyDataSetChanged();
LastPostKey = dataSnapshot.getKey();
Log.d("texting","current Key after Change: "+ LastPostKey);
@Override
public void onChildChanged(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onChildRemoved(@NonNull DataSnapshot dataSnapshot)
@Override
public void onChildMoved(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onCancelled(@NonNull DatabaseError databaseError)
);
else
Toast.makeText(DashBoardActivity.this,"No more notice to load",Toast.LENGTH_LONG).show();
But nothing is showing up when I click loadmoredata button
Here is the full code
package com.nadim.csedashboard;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.design.widget.FloatingActionButton;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.AbsListView;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.Toast;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.ChildEventListener;
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.messaging.FirebaseMessaging;
import com.nadim.csedashboard.adapters.NoticeAdapter;
import com.nadim.csedashboard.dataset.NoticeData;
import java.util.ArrayList;
import java.util.List;
public class DashBoardActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener
String username = "";
String LastPostKey = "", Lastmostkey = "";
List<NoticeData> noticeDatas = new ArrayList<>();
NoticeAdapter noticeAdapter;
final int item = 5;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dash_board);
new InternetCheck(new InternetCheck.Consumer()
@Override
public void accept(Boolean internet)
if(internet)
FirebaseMessaging.getInstance().subscribeToTopic("notice").addOnSuccessListener(new OnSuccessListener<Void>()
@Override
public void onSuccess(Void aVoid)
Toast.makeText(getApplicationContext(),"subs to notice Success",Toast.LENGTH_LONG).show();
);
Toast.makeText(DashBoardActivity.this,"Internet Found", Toast.LENGTH_LONG).show();
else
Toast.makeText(DashBoardActivity.this,"Internet not Found", Toast.LENGTH_LONG).show();
);
FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
if (user != null)
username = "SignOut ("+user.getEmail()+")";
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
final ListView listViewnotice = findViewById(R.id.listView_notice);
DatabaseReference noticeRef = FirebaseDatabase.getInstance().getReference().child("noticeboard").child("posts");
Query noticeQuery = noticeRef.orderByChild("timestamp").limitToFirst(6);
noticeQuery.addChildEventListener(new ChildEventListener()
@Override
public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
NoticeData n = dataSnapshot.getValue(NoticeData.class);
noticeDatas.add(n);
noticeAdapter.notifyDataSetChanged();
LastPostKey = dataSnapshot.getKey();
//Toast.makeText(DashBoardActivity.this,"Current Key:"+LastPostKey,Toast.LENGTH_LONG).show();
Log.d("texting","current Key: "+ LastPostKey);
@Override
public void onChildChanged(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onChildRemoved(@NonNull DataSnapshot dataSnapshot)
@Override
public void onChildMoved(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onCancelled(@NonNull DatabaseError databaseError)
);
Query lastKey = noticeRef.orderByKey().limitToFirst(1);
lastKey.addChildEventListener(new ChildEventListener()
@Override
public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
Lastmostkey = dataSnapshot.getKey();
Log.d("texting","Last Key: "+ Lastmostkey);
@Override
public void onChildChanged(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onChildRemoved(@NonNull DataSnapshot dataSnapshot)
@Override
public void onChildMoved(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onCancelled(@NonNull DatabaseError databaseError)
);
noticeAdapter = new NoticeAdapter(this,noticeDatas);
listViewnotice.setAdapter(noticeAdapter);
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View loadMore = inflater.inflate(R.layout.more, null);
listViewnotice.addFooterView(loadMore);
Button loadmoredata = loadMore.findViewById(R.id.button_loadmore);
loadmoredata.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
Log.d("texting","this but is working inside"+ noticeDatas.size());
Log.d("texting","current Key after click: "+ LastPostKey);
Log.d("texting","last Key after click: "+ Lastmostkey);
DatabaseReference noticeRefu = FirebaseDatabase.getInstance().getReference().child("noticeboard").child("posts");
Query noticeQuery = noticeRefu.orderByChild("timestamp").startAt("-1542128676980").limitToFirst(noticeDatas.size() + 5 );
if(!LastPostKey.equals(Lastmostkey))
noticeQuery.addChildEventListener(new ChildEventListener()
@Override
public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
NoticeData n = dataSnapshot.getValue(NoticeData.class);
noticeDatas.add(n);
Log.d("texting","this is working inside"+ noticeDatas.size());
noticeAdapter.notifyDataSetChanged();
LastPostKey = dataSnapshot.getKey();
Log.d("texting","current Key after Change: "+ LastPostKey);
@Override
public void onChildChanged(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onChildRemoved(@NonNull DataSnapshot dataSnapshot)
@Override
public void onChildMoved(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onCancelled(@NonNull DatabaseError databaseError)
);
else
Toast.makeText(DashBoardActivity.this,"No more notice to load",Toast.LENGTH_LONG).show();
);
listViewnotice.setOnItemClickListener(new AdapterView.OnItemClickListener()
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l)
Intent intent = new Intent(DashBoardActivity.this,NoticeActivity.class);
intent.putExtra("dlimage",noticeDatas.get(i).getNotice_picture());
intent.putExtra("ntitle",noticeDatas.get(i).getNoticetitle());
startActivity(intent);
);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
Intent svc = new Intent(DashBoardActivity.this, ViewClass.class);
svc.putExtra("batchname","8thBatch");
//startService(svc);
startActivity(svc);
/*Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();*/
);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
@Override
public void onBackPressed()
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START))
drawer.closeDrawer(GravityCompat.START);
else
finishAffinity();
System.exit(0);
@Override
public boolean onCreateOptionsMenu(Menu menu)
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.dash_board, menu);
return true;
@Override
public boolean onPrepareOptionsMenu(Menu menu)
menu.findItem(R.id.action_logout).setTitle(username);
return super.onPrepareOptionsMenu(menu);
@Override
public boolean onOptionsItemSelected(MenuItem item)
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings)
Intent intent = new Intent(DashBoardActivity.this,UserProfile.class);
startActivity(intent);
return true;
if (id == R.id.action_logout)
FirebaseAuth.getInstance().signOut();
Intent intent = new Intent(DashBoardActivity.this,LoginActivity.class);
startActivity(intent);
Toast.makeText(DashBoardActivity.this, "Signed Out.",
Toast.LENGTH_LONG).show();
return true;
if (id == R.id.action_back)
onBackPressed();
return true;
return super.onOptionsItemSelected(item);
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item)
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_camera)
// Handle the camera action
else if (id == R.id.nav_gallery)
else if (id == R.id.nav_slideshow)
else if (id == R.id.nav_manage)
else if (id == R.id.nav_share)
else if (id == R.id.nav_send)
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
What should I do? Is there any way to load first 6 item followed by next 5 items? using timestamp child
java
android firebase edited Nov 14 '18 at 8:36
KENdi
5,8192821
asked Nov 13 '18 at 20:46
smnadim21smnadim21
11
First 6 items followed by next 5 items. Can you explain this a bit more and why not first 11 would work for you in this?
– PradyumanDixit
Nov 14 '18 at 3:55
i am making a notice Board android app in which each notice have a title and an image. day by day number of notice will be more and more in numbers. I want to load first 6 notice with respect to child "timestamp". and when some one press load more button next 5 item will load followed by first 6. I want this to save bandwidth of both user and firebase. Can you help me to solve this?
– smnadim21
Nov 14 '18 at 7:56
If you want at some point to try Cloud Firestore, this is a recommended way in which you can load more data on button click.
– Alex Mamo
Nov 14 '18 at 12:41
thank you @AlexMamo :)
– smnadim21
Nov 15 '18 at 14:24
add a comment |
0
0
0
My database looks like this
What I want to do is I want to load first 6 item followed by next 5 item using below code
DatabaseReference noticeRefu = FirebaseDatabase.getInstance().getReference().child("noticeboard").child("posts");
Query noticeQuery = noticeRefu.orderByChild("timestamp").startAt("-1542128676980").limitToFirst(15);
if(!LastPostKey.equals(Lastmostkey))
noticeDatas.clear();
noticeQuery.addChildEventListener(new ChildEventListener()
@Override
public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
NoticeData n = dataSnapshot.getValue(NoticeData.class);
noticeDatas.add(n);
Log.d("texting","this is working inside"+ noticeDatas.size());
noticeAdapter.notifyDataSetChanged();
LastPostKey = dataSnapshot.getKey();
Log.d("texting","current Key after Change: "+ LastPostKey);
@Override
public void onChildChanged(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onChildRemoved(@NonNull DataSnapshot dataSnapshot)
@Override
public void onChildMoved(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onCancelled(@NonNull DatabaseError databaseError)
);
else
Toast.makeText(DashBoardActivity.this,"No more notice to load",Toast.LENGTH_LONG).show();
But nothing is showing up when I click loadmoredata button
Here is the full code
package com.nadim.csedashboard;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.design.widget.FloatingActionButton;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.AbsListView;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.Toast;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.ChildEventListener;
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.messaging.FirebaseMessaging;
import com.nadim.csedashboard.adapters.NoticeAdapter;
import com.nadim.csedashboard.dataset.NoticeData;
import java.util.ArrayList;
import java.util.List;
public class DashBoardActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener
String username = "";
String LastPostKey = "", Lastmostkey = "";
List<NoticeData> noticeDatas = new ArrayList<>();
NoticeAdapter noticeAdapter;
final int item = 5;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dash_board);
new InternetCheck(new InternetCheck.Consumer()
@Override
public void accept(Boolean internet)
if(internet)
FirebaseMessaging.getInstance().subscribeToTopic("notice").addOnSuccessListener(new OnSuccessListener<Void>()
@Override
public void onSuccess(Void aVoid)
Toast.makeText(getApplicationContext(),"subs to notice Success",Toast.LENGTH_LONG).show();
);
Toast.makeText(DashBoardActivity.this,"Internet Found", Toast.LENGTH_LONG).show();
else
Toast.makeText(DashBoardActivity.this,"Internet not Found", Toast.LENGTH_LONG).show();
);
FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
if (user != null)
username = "SignOut ("+user.getEmail()+")";
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
final ListView listViewnotice = findViewById(R.id.listView_notice);
DatabaseReference noticeRef = FirebaseDatabase.getInstance().getReference().child("noticeboard").child("posts");
Query noticeQuery = noticeRef.orderByChild("timestamp").limitToFirst(6);
noticeQuery.addChildEventListener(new ChildEventListener()
@Override
public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
NoticeData n = dataSnapshot.getValue(NoticeData.class);
noticeDatas.add(n);
noticeAdapter.notifyDataSetChanged();
LastPostKey = dataSnapshot.getKey();
//Toast.makeText(DashBoardActivity.this,"Current Key:"+LastPostKey,Toast.LENGTH_LONG).show();
Log.d("texting","current Key: "+ LastPostKey);
@Override
public void onChildChanged(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onChildRemoved(@NonNull DataSnapshot dataSnapshot)
@Override
public void onChildMoved(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onCancelled(@NonNull DatabaseError databaseError)
);
Query lastKey = noticeRef.orderByKey().limitToFirst(1);
lastKey.addChildEventListener(new ChildEventListener()
@Override
public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
Lastmostkey = dataSnapshot.getKey();
Log.d("texting","Last Key: "+ Lastmostkey);
@Override
public void onChildChanged(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onChildRemoved(@NonNull DataSnapshot dataSnapshot)
@Override
public void onChildMoved(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onCancelled(@NonNull DatabaseError databaseError)
);
noticeAdapter = new NoticeAdapter(this,noticeDatas);
listViewnotice.setAdapter(noticeAdapter);
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View loadMore = inflater.inflate(R.layout.more, null);
listViewnotice.addFooterView(loadMore);
Button loadmoredata = loadMore.findViewById(R.id.button_loadmore);
loadmoredata.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
Log.d("texting","this but is working inside"+ noticeDatas.size());
Log.d("texting","current Key after click: "+ LastPostKey);
Log.d("texting","last Key after click: "+ Lastmostkey);
DatabaseReference noticeRefu = FirebaseDatabase.getInstance().getReference().child("noticeboard").child("posts");
Query noticeQuery = noticeRefu.orderByChild("timestamp").startAt("-1542128676980").limitToFirst(noticeDatas.size() + 5 );
if(!LastPostKey.equals(Lastmostkey))
noticeQuery.addChildEventListener(new ChildEventListener()
@Override
public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
NoticeData n = dataSnapshot.getValue(NoticeData.class);
noticeDatas.add(n);
Log.d("texting","this is working inside"+ noticeDatas.size());
noticeAdapter.notifyDataSetChanged();
LastPostKey = dataSnapshot.getKey();
Log.d("texting","current Key after Change: "+ LastPostKey);
@Override
public void onChildChanged(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onChildRemoved(@NonNull DataSnapshot dataSnapshot)
@Override
public void onChildMoved(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onCancelled(@NonNull DatabaseError databaseError)
);
else
Toast.makeText(DashBoardActivity.this,"No more notice to load",Toast.LENGTH_LONG).show();
);
listViewnotice.setOnItemClickListener(new AdapterView.OnItemClickListener()
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l)
Intent intent = new Intent(DashBoardActivity.this,NoticeActivity.class);
intent.putExtra("dlimage",noticeDatas.get(i).getNotice_picture());
intent.putExtra("ntitle",noticeDatas.get(i).getNoticetitle());
startActivity(intent);
);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
Intent svc = new Intent(DashBoardActivity.this, ViewClass.class);
svc.putExtra("batchname","8thBatch");
//startService(svc);
startActivity(svc);
/*Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();*/
);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
@Override
public void onBackPressed()
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START))
drawer.closeDrawer(GravityCompat.START);
else
finishAffinity();
System.exit(0);
@Override
public boolean onCreateOptionsMenu(Menu menu)
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.dash_board, menu);
return true;
@Override
public boolean onPrepareOptionsMenu(Menu menu)
menu.findItem(R.id.action_logout).setTitle(username);
return super.onPrepareOptionsMenu(menu);
@Override
public boolean onOptionsItemSelected(MenuItem item)
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings)
Intent intent = new Intent(DashBoardActivity.this,UserProfile.class);
startActivity(intent);
return true;
if (id == R.id.action_logout)
FirebaseAuth.getInstance().signOut();
Intent intent = new Intent(DashBoardActivity.this,LoginActivity.class);
startActivity(intent);
Toast.makeText(DashBoardActivity.this, "Signed Out.",
Toast.LENGTH_LONG).show();
return true;
if (id == R.id.action_back)
onBackPressed();
return true;
return super.onOptionsItemSelected(item);
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item)
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_camera)
// Handle the camera action
else if (id == R.id.nav_gallery)
else if (id == R.id.nav_slideshow)
else if (id == R.id.nav_manage)
else if (id == R.id.nav_share)
else if (id == R.id.nav_send)
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
What should I do? Is there any way to load first 6 item followed by next 5 items? using timestamp child
java
android firebase edited Nov 14 '18 at 8:36
KENdi
5,8192821
asked Nov 13 '18 at 20:46
smnadim21smnadim21
11
My database looks like this
What I want to do is I want to load first 6 item followed by next 5 item using below code
DatabaseReference noticeRefu = FirebaseDatabase.getInstance().getReference().child("noticeboard").child("posts");
Query noticeQuery = noticeRefu.orderByChild("timestamp").startAt("-1542128676980").limitToFirst(15);
if(!LastPostKey.equals(Lastmostkey))
noticeDatas.clear();
noticeQuery.addChildEventListener(new ChildEventListener()
@Override
public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
NoticeData n = dataSnapshot.getValue(NoticeData.class);
noticeDatas.add(n);
Log.d("texting","this is working inside"+ noticeDatas.size());
noticeAdapter.notifyDataSetChanged();
LastPostKey = dataSnapshot.getKey();
Log.d("texting","current Key after Change: "+ LastPostKey);
@Override
public void onChildChanged(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onChildRemoved(@NonNull DataSnapshot dataSnapshot)
@Override
public void onChildMoved(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onCancelled(@NonNull DatabaseError databaseError)
);
else
Toast.makeText(DashBoardActivity.this,"No more notice to load",Toast.LENGTH_LONG).show();
But nothing is showing up when I click loadmoredata button
Here is the full code
package com.nadim.csedashboard;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.design.widget.FloatingActionButton;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.AbsListView;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.Toast;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.ChildEventListener;
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.messaging.FirebaseMessaging;
import com.nadim.csedashboard.adapters.NoticeAdapter;
import com.nadim.csedashboard.dataset.NoticeData;
import java.util.ArrayList;
import java.util.List;
public class DashBoardActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener
String username = "";
String LastPostKey = "", Lastmostkey = "";
List<NoticeData> noticeDatas = new ArrayList<>();
NoticeAdapter noticeAdapter;
final int item = 5;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dash_board);
new InternetCheck(new InternetCheck.Consumer()
@Override
public void accept(Boolean internet)
if(internet)
FirebaseMessaging.getInstance().subscribeToTopic("notice").addOnSuccessListener(new OnSuccessListener<Void>()
@Override
public void onSuccess(Void aVoid)
Toast.makeText(getApplicationContext(),"subs to notice Success",Toast.LENGTH_LONG).show();
);
Toast.makeText(DashBoardActivity.this,"Internet Found", Toast.LENGTH_LONG).show();
else
Toast.makeText(DashBoardActivity.this,"Internet not Found", Toast.LENGTH_LONG).show();
);
FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
if (user != null)
username = "SignOut ("+user.getEmail()+")";
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
final ListView listViewnotice = findViewById(R.id.listView_notice);
DatabaseReference noticeRef = FirebaseDatabase.getInstance().getReference().child("noticeboard").child("posts");
Query noticeQuery = noticeRef.orderByChild("timestamp").limitToFirst(6);
noticeQuery.addChildEventListener(new ChildEventListener()
@Override
public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
NoticeData n = dataSnapshot.getValue(NoticeData.class);
noticeDatas.add(n);
noticeAdapter.notifyDataSetChanged();
LastPostKey = dataSnapshot.getKey();
//Toast.makeText(DashBoardActivity.this,"Current Key:"+LastPostKey,Toast.LENGTH_LONG).show();
Log.d("texting","current Key: "+ LastPostKey);
@Override
public void onChildChanged(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onChildRemoved(@NonNull DataSnapshot dataSnapshot)
@Override
public void onChildMoved(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onCancelled(@NonNull DatabaseError databaseError)
);
Query lastKey = noticeRef.orderByKey().limitToFirst(1);
lastKey.addChildEventListener(new ChildEventListener()
@Override
public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
Lastmostkey = dataSnapshot.getKey();
Log.d("texting","Last Key: "+ Lastmostkey);
@Override
public void onChildChanged(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onChildRemoved(@NonNull DataSnapshot dataSnapshot)
@Override
public void onChildMoved(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onCancelled(@NonNull DatabaseError databaseError)
);
noticeAdapter = new NoticeAdapter(this,noticeDatas);
listViewnotice.setAdapter(noticeAdapter);
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View loadMore = inflater.inflate(R.layout.more, null);
listViewnotice.addFooterView(loadMore);
Button loadmoredata = loadMore.findViewById(R.id.button_loadmore);
loadmoredata.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
Log.d("texting","this but is working inside"+ noticeDatas.size());
Log.d("texting","current Key after click: "+ LastPostKey);
Log.d("texting","last Key after click: "+ Lastmostkey);
DatabaseReference noticeRefu = FirebaseDatabase.getInstance().getReference().child("noticeboard").child("posts");
Query noticeQuery = noticeRefu.orderByChild("timestamp").startAt("-1542128676980").limitToFirst(noticeDatas.size() + 5 );
if(!LastPostKey.equals(Lastmostkey))
noticeQuery.addChildEventListener(new ChildEventListener()
@Override
public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
NoticeData n = dataSnapshot.getValue(NoticeData.class);
noticeDatas.add(n);
Log.d("texting","this is working inside"+ noticeDatas.size());
noticeAdapter.notifyDataSetChanged();
LastPostKey = dataSnapshot.getKey();
Log.d("texting","current Key after Change: "+ LastPostKey);
@Override
public void onChildChanged(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onChildRemoved(@NonNull DataSnapshot dataSnapshot)
@Override
public void onChildMoved(@NonNull DataSnapshot dataSnapshot, @Nullable String s)
@Override
public void onCancelled(@NonNull DatabaseError databaseError)
);
else
Toast.makeText(DashBoardActivity.this,"No more notice to load",Toast.LENGTH_LONG).show();
);
listViewnotice.setOnItemClickListener(new AdapterView.OnItemClickListener()
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l)
Intent intent = new Intent(DashBoardActivity.this,NoticeActivity.class);
intent.putExtra("dlimage",noticeDatas.get(i).getNotice_picture());
intent.putExtra("ntitle",noticeDatas.get(i).getNoticetitle());
startActivity(intent);
);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
Intent svc = new Intent(DashBoardActivity.this, ViewClass.class);
svc.putExtra("batchname","8thBatch");
//startService(svc);
startActivity(svc);
/*Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();*/
);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
@Override
public void onBackPressed()
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START))
drawer.closeDrawer(GravityCompat.START);
else
finishAffinity();
System.exit(0);
@Override
public boolean onCreateOptionsMenu(Menu menu)
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.dash_board, menu);
return true;
@Override
public boolean onPrepareOptionsMenu(Menu menu)
menu.findItem(R.id.action_logout).setTitle(username);
return super.onPrepareOptionsMenu(menu);
@Override
public boolean onOptionsItemSelected(MenuItem item)
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings)
Intent intent = new Intent(DashBoardActivity.this,UserProfile.class);
startActivity(intent);
return true;
if (id == R.id.action_logout)
FirebaseAuth.getInstance().signOut();
Intent intent = new Intent(DashBoardActivity.this,LoginActivity.class);
startActivity(intent);
Toast.makeText(DashBoardActivity.this, "Signed Out.",
Toast.LENGTH_LONG).show();
return true;
if (id == R.id.action_back)
onBackPressed();
return true;
return super.onOptionsItemSelected(item);
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item)
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_camera)
// Handle the camera action
else if (id == R.id.nav_gallery)
else if (id == R.id.nav_slideshow)
else if (id == R.id.nav_manage)
else if (id == R.id.nav_share)
else if (id == R.id.nav_send)
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
What should I do? Is there any way to load first 6 item followed by next 5 items? using timestamp child
java
android firebase java
android firebase edited Nov 14 '18 at 8:36
KENdi
5,8192821
asked Nov 13 '18 at 20:46
smnadim21smnadim21
11
edited Nov 14 '18 at 8:36
KENdi
5,8192821
asked Nov 13 '18 at 20:46
smnadim21smnadim21
11
edited Nov 14 '18 at 8:36
KENdi
5,8192821
edited Nov 14 '18 at 8:36
KENdi
5,8192821
edited Nov 14 '18 at 8:36
KENdi
5,8192821
5,8192821
asked Nov 13 '18 at 20:46
smnadim21smnadim21
11
asked Nov 13 '18 at 20:46
smnadim21smnadim21
11
asked Nov 13 '18 at 20:46
smnadim21smnadim21
11
11
First 6 items followed by next 5 items. Can you explain this a bit more and why not first 11 would work for you in this?
– PradyumanDixit
Nov 14 '18 at 3:55
i am making a notice Board android app in which each notice have a title and an image. day by day number of notice will be more and more in numbers. I want to load first 6 notice with respect to child "timestamp". and when some one press load more button next 5 item will load followed by first 6. I want this to save bandwidth of both user and firebase. Can you help me to solve this?
– smnadim21
Nov 14 '18 at 7:56
If you want at some point to try Cloud Firestore, this is a recommended way in which you can load more data on button click.
– Alex Mamo
Nov 14 '18 at 12:41
thank you @AlexMamo :)
– smnadim21
Nov 15 '18 at 14:24
add a comment |
First 6 items followed by next 5 items. Can you explain this a bit more and why not first 11 would work for you in this?
– PradyumanDixit
Nov 14 '18 at 3:55
i am making a notice Board android app in which each notice have a title and an image. day by day number of notice will be more and more in numbers. I want to load first 6 notice with respect to child "timestamp". and when some one press load more button next 5 item will load followed by first 6. I want this to save bandwidth of both user and firebase. Can you help me to solve this?
– smnadim21
Nov 14 '18 at 7:56
If you want at some point to try Cloud Firestore, this is a recommended way in which you can load more data on button click.
– Alex Mamo
Nov 14 '18 at 12:41
thank you @AlexMamo :)
– smnadim21
Nov 15 '18 at 14:24
First 6 items followed by next 5 items. Can you explain this a bit more and why not first 11 would work for you in this?
– PradyumanDixit
Nov 14 '18 at 3:55
First 6 items followed by next 5 items. Can you explain this a bit more and why not first 11 would work for you in this?
– PradyumanDixit
Nov 14 '18 at 3:55
i am making a notice Board android app in which each notice have a title and an image. day by day number of notice will be more and more in numbers. I want to load first 6 notice with respect to child "timestamp". and when some one press load more button next 5 item will load followed by first 6. I want this to save bandwidth of both user and firebase. Can you help me to solve this?
– smnadim21
Nov 14 '18 at 7:56
i am making a notice Board android app in which each notice have a title and an image. day by day number of notice will be more and more in numbers. I want to load first 6 notice with respect to child "timestamp". and when some one press load more button next 5 item will load followed by first 6. I want this to save bandwidth of both user and firebase. Can you help me to solve this?
– smnadim21
Nov 14 '18 at 7:56
If you want at some point to try Cloud Firestore, this is a recommended way in which you can load more data on button click.
– Alex Mamo
Nov 14 '18 at 12:41
If you want at some point to try Cloud Firestore, this is a recommended way in which you can load more data on button click.
– Alex Mamo
Nov 14 '18 at 12:41
thank you @AlexMamo :)
– smnadim21
Nov 15 '18 at 14:24
thank you @AlexMamo :)
– smnadim21
Nov 15 '18 at 14:24
add a comment |
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First 6 items followed by next 5 items. Can you explain this a bit more and why not first 11 would work for you in this?
– PradyumanDixit
Nov 14 '18 at 3:55
i am making a notice Board android app in which each notice have a title and an image. day by day number of notice will be more and more in numbers. I want to load first 6 notice with respect to child "timestamp". and when some one press load more button next 5 item will load followed by first 6. I want this to save bandwidth of both user and firebase. Can you help me to solve this?
– smnadim21
Nov 14 '18 at 7:56
If you want at some point to try Cloud Firestore, this is a recommended way in which you can load more data on button click.
– Alex Mamo
Nov 14 '18 at 12:41
thank you @AlexMamo :)
– smnadim21
Nov 15 '18 at 14:24