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Retrieving data with pagination

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When you have a huge JSON database, adding a value event listener doesn’t make sense. It will return the huge JSON and parsing it would be time consuming. In such cases we can use pagination and fetch part of data and display or process it. Kind of like lazy loading or like fetching old chats when user clicks on show older chat. In this case Query can used.

Let’s take the our old example in previous sections. The user base contains 3 users, if it grows to say 3 hundred thousand user and you want to fetch the user list in batches of 50: 

// class level
final int limit = 50;
int start = 0;

// event level
Query userListQuery = userDBRef.orderByChild("email").limitToFirst(limit)
        .startAt(start)
userListQuery.addValueEventListener(new ValueEventListener() {
    @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
        // Do something
        start += (limit+1);
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {
        // Do something about the error
    });

Here value or child events can be added and listened to. Call query again to fetch next 50. Make sure to add the orderByChild() method, this will not work without that. Firebase needs to know the order by which you are paginating.

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Firebase Realtime Database:
* Firebase Realtime DataBase
* Quick setup
* Firebase Realtime DataBase event handler
* Designing and understanding how to retrieve realtime data from the Firebase Database
* Denormalization Flat Database Structure
* Understanding firebase JSON database
* Retrieving data from firebase
* Listening for child updates
* Retrieving data with pagination
Table Of Contents
0 Getting Started
1 Layouts
2 Gradle
3 RecyclerView onClickListeners
4 NavigationView
5 Intent
6 JSON handling with org.json
7 Android Studio
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9 Data Binding Library
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88 Text to Speech (TTS)
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96 Enhancing Performance Using Icon Fonts
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99 Firebase
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101 Check Internet Connectivity
102 Facebook SDK
103 Unzip File
104 Android Places API
105 Creating your own libraries
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107 Device Display Metrics
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110 Building Backwards Compatible Apps
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135 Swipe to Refresh
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142 Firebase Realtime Database
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144 Email Validation
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154 Displaying Google Ads
155 Vk SDK
156 Localized DateTime
157 Count Down Timer
158 Reading Barcode and QR codes
159 Otto Event Bus
160 TransitionDrawable
161 Port Mapping using Cling
162 Creating Overlay always-on-top Windows
163 ExoPlayer
164 Inter-app UI testing with UIAutomator
165 MediaSession
166 Speech to Text Conversion
167 FileProvider
168 Publish .aar file to Apache Archive with Gradle
169 XMPP
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172 AudioManager
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174 Accounts and AccountManager
175 OpenCV
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184 ORMLite
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187 Retrofit2 with RxJava
188 DayNight Theme AppCompat
189 ShortcutManager
190 LruCache
191 Using Jenkins CI
192 Zip files
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194 Fastlane
195 Define step value for RangeSeekBar
196 Getting started with OpenGL ES 2.0
197 Check Data Connection
198 Java Native Interface (JNI)
199 FileIO
200 Perfomance Optimization
201 Robolectric
202 Moshi
203 Strick Mode Policy
204 Internalization and localization
205 Retrolambda
206 SparseArray
207 Firebase Cloud Messaging
208 Shared Element Transitions
209 Android Things
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212 Dependency Injection with Dagger 2
213 Formatting phone numbers
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215 Android Kernel Optimization
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219 Create Android Custom ROMs
220 Java on Android
221 Pagination in RecyclerVi
222 Genymotion for Android
223 Handling touch and motion events
224 Creating Splash screen
225 ConstraintSet
226 CleverTap
227 Publish library to Maven repositories
228 ADB shell
229 Ping ICMP
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231 Using Kotlin
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234 Context
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236 Secure SharedPreferences
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241 Design Patterns
242 Okio
243 Google SignIn integration
244 TensorFlow
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247 Bluetooth Low Energy (LE)
248 Leak Canary
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250 SQLite using ContentValues
251 Enhancing Alert Dialogs
252 Hardware Button Events, Intents PTT
253 SpannableString
254 Looper
255 Optimized VideoView
256 Google Drive API
257 Animated AlertDialog Box
258 Annotation Processor
259 SyncAdapter with periodically do sync of data
260 Singleton Class for Toast Message
261 Fastjson
262 Android Architecture Components
263 Jackson
264 Play Store
265 Loading Bitmaps Effectively
266 Getting system font names
267 Smartcard
268 Convert vietnamese string to english
269 Contributors