Cloud Firestore Android codelab
Home Page: https://codelabs.developers.google.com/codelabs/firestore-android
License: Apache License 2.0
This is the source code that accompanies the Firestore Android Codelab: https://codelabs.developers.google.com/codelabs/firestore-android
The codelab will walk you through developing an Android restaurant recommendation app powered by Cloud Firestore.
If you don't want to do the codelab and would rather view the completed sample code, see the Firebase Android Quickstart repository: https://github.com/firebase/quickstart-android
In the Step - "Display data from Firestore", the provided code does not handle the case of propagating the Listen errors to the protected method onError() of FirestoreAdapter. If propagated, then only the user will be able to see a Snackbar in case of any Listen errors occurring due to improper Query, in the onEvent() callback of EventListener. This onError() method is overidden by subclasses of FirestoreAdapter to provide their own implementation for handling the FirebaseFirestoreException error passed to it.
Device: Android Studio/Emulator
Project: friendlyeats-android
compileSdkVersion 29
buildToolsVersion '29.0.2'
applicationId 'com.google.firebase.example.fireeats'
minSdkVersion 16
targetSdkVersion 29
Problem:
Tutorial Step 4: Write Data to Firestore
Adding the suggested code to MainActivity onAddItemsClicked() does not recognize the Restaurant class.
Error:
error: cannot find symbol
Restaurant restaurant = RestaurantUtil.getRandom(this);
What steps will reproduce the problem:
What is the expected result?
The app builds and runs on the emulator. Sample data is loaded into the restaurants collection in firestore.
What happens instead of that?
Build error:
error: cannot find symbol
Restaurant restaurant = RestaurantUtil.getRandom(this);
ERROR: This version of Android Studio cannot open this project, please retry with Android Studio 4.0 or newer.
Android beginner trying to learn FIrestore here.
When trying to run this app with all the dependencies updated to the latest available version, I am unable to to sign in. I enter my email and click on next but the home screen is only shown for a second and it immediately switches back to the Sign in screen asking me to enter my email. The tutorial says I should be able to sign in and see the home screen without changing any code. Please forgive me if this issue is because I did something wrong. Thanks!
P.S. I have tried running the app as is, with all the included outdated dependencies and I still face the same issue.
startActivityForResult is depricated and app doesnot sign in
The description of step 8 states:
...updates to a restaurant document can only change the ratings, not the name or any other immutable data.
However, the update rule only makes sure the user is authenticated and the restaurant name is unchanged - any other change to the restaurant object would be possible.
match /databases/{database}/documents {
// Restaurants:
// - Authenticated user can read
// - Authenticated user can create/update (for demo)
// - Validate updates
// - Deletes are not allowed
match /restaurants/{restaurantId} {
allow read, create: if request.auth != null;
allow update: if request.auth != null
&& request.resource.data.name == resource.data.name
allow delete: if false;
`نْحّـنُ الـنّْآر الصّْغّرى نْحّنُ منّ تَـحدَى أَعآلي الْجِبّـآل وجَبّروُتْ القِمّمْ
It Throws an error when I re-open the FilterDialogFragment, this occurs when I hit Add Random Items then clicking back again the filter dialog.
The restaurant recommendation app https://codelabs.developers.google.com/codelabs/firestore-android/#0 needs to be update when defining gradle dependencies as documented in this stackoverflow post. The dependency is mandatory now:
implementation 'com.google.firebase:firebase-firestore:17.0.4'
implementation 'com.google.firebase:firebase-core:16.0.1'
I have added Composite index yet it fires warning
For those of who have set up issue like dependencies and deprecated code. Change it as follows.
// FirebaseUI (for authentication) implementation 'com.firebaseui:firebase-ui-auth:4.0.0'
// ButterKnife (for sample code brevity) implementation "com.jakewharton:butterknife:8.8.0" annotationProcessor "com.jakewharton:butterknife-compiler:8.8.0"
...
// Android architecture components implementation 'android.arch.lifecycle:extensions:1.1.0' implementation 'android.arch.lifecycle:runtime:1.1.0' annotationProcessor 'android.arch.lifecycle:compiler:1.1.0'
implementation 'me.zhanghai.android.materialratingbar:library:1.3.1'
and change the AuthUI.EMAIL...
new AuthUI.IdpConfig.EmailBuilder().build()
I am not sure it works for those of who have same problem. But it works for me.
For learning the resources, I want to collect the php files with this projects. Could you help me?
Not really a bug, but maybe a logical bug.
Logic allows for unlimited review submissions.
Would be nice to limit to 1 review per user.
I enjoyed this codelab!
I think many people stuck on this moment "Open the FirestoreAdapter class, which has been partially implemented already. First, let's make the adapter implement EventListener and define the onEvent function so that it can receive updates to a Firestore query:"
because of...
and there is no onEvent
logcat output, etc.Unknown
Thanks for the Code lab.
In step 5 "Sort and filter data" there´s a text: "In the logs you will notice some warnings:"
I think there should be an explanation on where this log is located?
ImageDataModel.kt
class ImageDataModel @Inject constructor(private val firebaseFirestore: FirebaseFirestore) : ViewModel() {
var isLoading = MutableLiveData<Boolean>()
var isPagerLoading = MutableLiveData<Boolean>()
var apiError = MutableLiveData<String>()
var imgResponse = MutableLiveData<QuerySnapshot>()
fun getPhotosByOrder(orderBy: String){
isLoading.value = true
var query: Query
query = firebaseFirestore.collection(DBConstant.PHOTO.tableNm)
.orderBy(orderBy)
.limit(12)
query.get()
.addOnSuccessListener { documentSnapshots ->
// Get the last visible document
if(documentSnapshots != null){
isLoading.value = false
imgResponse.value = documentSnapshots
}else{
isLoading.value = false
apiError.value = Constant.SERVER_CONNECTION_ERROR
}
}
.addOnFailureListener {
isLoading.value = false
apiError.value = it.message
}
}
fun getPhotosByOrderPagination(orderBy: String, lastVisible: DocumentSnapshot?){
isPagerLoading.value = true
var query: Query
query = firebaseFirestore.collection(DBConstant.PHOTO.tableNm)
.orderBy(orderBy)
.startAfter(lastVisible)
.limit(6)
query.get()
.addOnSuccessListener { documentSnapshots ->
// Get the last visible document
if(documentSnapshots != null){
isPagerLoading.value = false
imgResponse.value = documentSnapshots
}else{
isPagerLoading.value = false
apiError.value = Constant.SERVER_CONNECTION_ERROR
}
}
.addOnFailureListener {
isPagerLoading.value = false
apiError.value = it.message
}
}
}
Activity class:
private var lastVisible: DocumentSnapshot?= null
private fun bindObservers(){
imageDataModel.isLoading.observe(this, androidx.lifecycle.Observer {
if(it){
llPbLoading.visibility = View.VISIBLE
rvListFragBrowse.visibility = View.GONE
}else{
llPbLoading.visibility = View.GONE
rvListFragBrowse.visibility = View.VISIBLE
}
})
imageDataModel.apiError.observe(this, androidx.lifecycle.Observer {
toast(it, activity!!)
})
imageDataModel.imgResponse.observe(this, androidx.lifecycle.Observer {
photosList.clear()
if(it.size() > 0){
lastVisible = it.documents[it.size() - 1]
Log.e("BrowseFrag","Last Item Name: "+lastVisible!!)
for(item in it){
var photoData = item.toObject(PhotosData::class.java)
photoData.id = item.id
photosList.add(photoData)
mAdapterBrowse.notifyDataSetChanged()
}
}
})
}
private fun getPhotosByOrder(orderBy: String){
if(lastVisible == null){
imageDataModel.getPhotosByOrder(orderBy)
}else{
imageDataModel.getPhotosByOrderPagination(orderBy, lastVisible)
}
}
I am getting below error log:
java.lang.IllegalArgumentException: Invalid data. Unsupported type: com.google.firebase.firestore.QueryDocumentSnapshot at com.google.firebase.firestore.core.UserData$ParseContext.createError(com.google.firebase:firebase-firestore@@17.1.5:293) at com.google.firebase.firestore.UserDataConverter.parseScalarValue(com.google.firebase:firebase-firestore@@17.1.5:405) at com.google.firebase.firestore.UserDataConverter.parseData(com.google.firebase:firebase-firestore@@17.1.5:254) at com.google.firebase.firestore.UserDataConverter.parseQueryValue(com.google.firebase:firebase-firestore@@17.1.5:186) at com.google.firebase.firestore.Query.boundFromFields(com.google.firebase:firebase-firestore@@17.1.5:669) at com.google.firebase.firestore.Query.startAfter(com.google.firebase:firebase-firestore@@17.1.5:517) at com.firestoredemo.viewmodel.ImageDataModel.getPhotosByOrderPagination(ImageDataModel.kt:64) at com.firestoredemo.ui.fragment.BrowseFragment.getPhotosByOrder(BrowseFragment.kt:228) at com.firestoredemo.ui.fragment.BrowseFragment.access$getPhotosByOrder(BrowseFragment.kt:44) at com.firestoredemo.ui.fragment.BrowseFragment$setListener$2.onLoadMore(BrowseFragment.kt:153) at com.firestoredemo.adapter.BrowseResultAdapter$1.onScrolled(BrowseResultAdapter.kt:57)
I was trying to implement a filter for querying data from firebase firestore just like the one in the codelab but i could not have it work well , the only way to make that query is by concatenating whereEqaulTo into a single statement otherwise it will not work, in fact ,if you set many whereEqualTo on the query object each one in a separate statement only the first statement whereEqualTo method is applied . the rest are ignored.
Firebase database have limited abilities when it comes to fetching and filtering data that is because it is no-sql database , having such issue make it even worse for someone who is looking for flexible and complex queries. I hope that you firebase team will find a solution for this issue soon.
Thanks for the Code lab.
In step 5 "Sort and filter data" user learns to create an index in the Firestore. The index talked about is price and numRating. However there is no explanation why in the demo app user can filer on food and city without creating this Firestore index?
Further explanation:
If I search for city Miami I get two hits. This does not require a Firestore index right.
There are two Miami one with coffee and one with pizza.
If I search for city Miami and food pizza I get one result. This should require a Firestore index or??
Following warning is reported by our custom FirestoreAdapter, when a user chooses to filter by a particular price and then sorts the results by price in the Filter Dialog-
2021-03-21 23:29:04.761 7574-7574/? W/FirestoreAdapter: onEvent:error
com.google.firebase.firestore.o: INVALID_ARGUMENT: Order by clause cannot contain a field with an equality filter price
at com.google.firebase.firestore.p0.b0.k(Unknown Source:22)
at com.google.firebase.firestore.k0.o.b(Unknown Source:30)
at com.google.firebase.firestore.k0.o0.r(Unknown Source:41)
at com.google.firebase.firestore.k0.o0.c(Unknown Source:83)
at com.google.firebase.firestore.k0.g0$b.c(Unknown Source:6)
at com.google.firebase.firestore.o0.m0.D(Unknown Source:69)
at com.google.firebase.firestore.o0.m0.s(Unknown Source:55)
at com.google.firebase.firestore.o0.m0.d(Unknown Source:0)
at com.google.firebase.firestore.o0.m0$a.e(Unknown Source:2)
at com.google.firebase.firestore.o0.t0.u(Unknown Source:21)
at com.google.firebase.firestore.o0.t0.n(Unknown Source:2)
at com.google.firebase.firestore.o0.b$c.g(Unknown Source:42)
at com.google.firebase.firestore.o0.d.run(Unknown Source:4)
at com.google.firebase.firestore.o0.b$a.a(Unknown Source:21)
at com.google.firebase.firestore.o0.b$c.d(Unknown Source:6)
at com.google.firebase.firestore.o0.t$a.c(Unknown Source:2)
at e.a.k1.p$e$b.b(Unknown Source:40)
at e.a.k1.p$e$b.a(Unknown Source:18)
at e.a.k1.x.run(Unknown Source:6)
at e.a.k1.z1.run(Unknown Source:11)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:462)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:301)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at com.google.firebase.firestore.p0.g$c$b.run(Unknown Source:15)
at java.lang.Thread.run(Thread.java:929)
Caused by: e.a.e1: INVALID_ARGUMENT: Order by clause cannot contain a field with an equality filter price
at e.a.d1.c(Unknown Source:2)
at com.google.firebase.firestore.p0.b0.k(Unknown Source:0)
at com.google.firebase.firestore.k0.o.b(Unknown Source:30)
at com.google.firebase.firestore.k0.o0.r(Unknown Source:41)
at com.google.firebase.firestore.k0.o0.c(Unknown Source:83)
at com.google.firebase.firestore.k0.g0$b.c(Unknown Source:6)
at com.google.firebase.firestore.o0.m0.D(Unknown Source:69)
at com.google.firebase.firestore.o0.m0.s(Unknown Source:55)
at com.google.firebase.firestore.o0.m0.d(Unknown Source:0)
at com.google.firebase.firestore.o0.m0$a.e(Unknown Source:2)
at com.google.firebase.firestore.o0.t0.u(Unknown Source:21)
at com.google.firebase.firestore.o0.t0.n(Unknown Source:2)
at com.google.firebase.firestore.o0.b$c.g(Unknown Source:42)
at com.google.firebase.firestore.o0.d.run(Unknown Source:4)
at com.google.firebase.firestore.o0.b$a.a(Unknown Source:21)
at com.google.firebase.firestore.o0.b$c.d(Unknown Source:6)
at com.google.firebase.firestore.o0.t$a.c(Unknown Source:2)
at e.a.k1.p$e$b.b(Unknown Source:40)
at e.a.k1.p$e$b.a(Unknown Source:18)
at e.a.k1.x.run(Unknown Source:6)
at e.a.k1.z1.run(Unknown Source:11)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:462)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:301)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at com.google.firebase.firestore.p0.g$c$b.run(Unknown Source:15)
at java.lang.Thread.run(Thread.java:929)
Looks like we need to disable the sort option on price when a particular price is selected by the user.
logcat output, etc.// TODO(you): code here to reproduce the problem
There should be instruction link for this sentence: If you don't have npm or you experience an error, read the installation instructions to get a standalone binary for your platform.
I have followed the steps up until Step 6, but none of the restaurant data is being stored in the Firestore. My user account gets stored in the Authentication tab, but nothing changes in Firestore.
The Emulator is running.
The Logcat shows no errors.
This is a snippet of the Logcat after clicking Add Random Items. The objects are created and they send off a com.google.firestore.v1.WriteRequest and there is a WriteResponse (the latter is in the picture above).
I have restarted this project a couple of times and I can't for the life of me figure out the issue
Thanks for the codelab its fun to learn this coming from Firebase real time databas.
In the FirestoreAdapter class javadoc I read:
/**
* RecyclerView adapter for displaying the results of a Firestore {@link Query}.
*
* Note that this class forgoes some efficiency to gain simplicity. For example, the result of
* {@link DocumentSnapshot#toObject(Class)} is not cached so the same object may be deserialized
* many times as the user scrolls.
*/
First I was thinking that efficiency explanation should be in the RestaurantAdapter but could you explain some more how this works if this is some Cloud Firestore feature or RecyclerView?
What about that all objects are cashed on Android and never read twice unless they are changed? What does this mean "many times as the user scrolls." scroll happens in RestaurantAdapter which read the already loaded DocumentSnapshot´s objects or??
Hi, I've been playing with the code and I was wondering why do you need the listener on the Restaurant collection? Let's say I want to remove the listener as there won't be any changes to my restaurant collection, how will you do that?
It's year 2024 and we have a modern Jetpack Compose available. It's time to rewrite this codelab in modern Jetpack Compose Kotlin language.
2021-10-29 14:31:04.158 10248-10274/? E/Bugle: RcsUtils. Error getting default configuration value for fallback setting
2021-10-29 14:31:04.158 10248-10274/? E/Bugle: com.google.android.rcs.client.e: Jibe SDK Service not available. Is the Jibe SDK service running? Did you call connect() and wait for the notification before calling an API function?
at com.google.android.rcs.client.a.c(SourceFile:76)
at com.google.android.rcs.client.profile.RcsProfileService.getRcsConfig(SourceFile:67)
at com.google.android.apps.messaging.shared.sms.al.i(SourceFile:772)
at com.google.android.apps.messaging.shared.analytics.RecurringTelemetryUploaderAction.doBackgroundWork(SourceFile:208)
at com.google.android.apps.messaging.shared.datamodel.action.ActionExecutorImpl$BackgroundWorkerRunnable.run(SourceFile:12)
at android.os.Handler.handleCallback(Handler.java:790)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:164)
at com.google.android.apps.messaging.shared.datamodel.action.c.run(SourceFile:10)
I am using this example, but am not able to paginate the data in this list according to the filters applied. I learn to paginate the list with filters in android. The other one I already know how to do it, by simply applying the FirestorePagingAdapter.
Goals
In this codelab you will build a restaurant recommendation app on Android backed by Cloud # irestore. You will learn how to:
I am having issue to start to Firebase Emulator UI. Firebase initialization complete! code appears but I face with a problem when try to start the emulators.
Could you please help me to solve the issue?
Thanks.
Please see the complete UI code like below:
###################################################################################################################################################################################################################
Welcome to...
######## #### ######## ######## ######## ### ###### ######## ##
## ## ## ## ## ## ## ## ## ## ## ##
###### ## ######## ###### ######## ######### ###### ###### ##
## ## ## ## ## ## ## ## ## ## ##
## #### ## ## ######## ######## ## ## ###### ######## ##
###################################################################################################################################################################################################################
~ Let's make sure your Firebase CLI is ready...
~ Looks like your CLI needs to be set up.
~ This may take a moment
+ Alright, your CLI is set up!
Already logged in as **********@gmail.com
+ You can now use the 'firebase' or 'npm' commands!
~ For more help see https://firebase.google.com/docs/cli/
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> firebase init emulators
######## #### ######## ######## ######## ### ###### ########
## ## ## ## ## ## ## ## ## ## ##
###### ## ######## ###### ######## ######### ###### ######
## ## ## ## ## ## ## ## ## ## ##
## #### ## ## ######## ######## ## ## ###### ########
You're about to initialize a Firebase project in this directory:
C:\Users\******\AndroidStudioProjects\friendlyeats-android
Before we get started, keep in mind:
* You are initializing within an existing Firebase project directory
? Are you ready to proceed? Yes
=== Project Setup
First, let's associate this project directory with a Firebase project.
You can create multiple project aliases by running firebase use --add,
but for now we'll just set up a default project.
i Using project friendly-eats-b308b (Friendly Eats)
=== Emulators Setup
? Which Firebase emulators do you want to set up? Press Space to select emulators, then Enter to confirm your choices. Authentication Emulator, Functions Emulator, Firestore Emulator, Database Emulator, Hosting
Emulator, Pub/Sub Emulator, Storage Emulator
i Port for auth already configured: 9099
i Port for functions already configured: 5001
i Port for firestore already configured: 8080
i Port for database already configured: 9000
i Port for hosting already configured: 5000
i Port for pubsub already configured: 8085
i Port for storage already configured: 9199
i Emulator UI already enabled with port: (automatic)
? Would you like to download the emulators now? Yes
i firestore: downloading cloud-firestore-emulator-v1.14.3.jar...
Progress: ========================================================================================================================================================================================> (100% of 61MB)
i database: downloading firebase-database-emulator-v4.8.0.jar...
Progress: ========================================================================================================================================================================================> (100% of 34MB)
i pubsub: downloading pubsub-emulator-0.1.0.zip...
Progress: ========================================================================================================================================================================================> (100% of 37MB)
i storage: downloading cloud-storage-rules-runtime-v1.0.2.jar...
Progress: ========================================================================================================================================================================================> (100% of 36MB)
i ui: downloading ui-v1.7.0.zip...
i Writing configuration info to firebase.json...
i Writing project information to .firebaserc...
+ Firebase initialization complete!
> firebase emulators:start
i emulators: Starting emulators: auth, functions, firestore, database, hosting, pubsub, storage
! functions: The functions emulator is configured but there is no functions source directory. Have you run firebase init functions?
i firestore: Firestore Emulator logging to firestore-debug.log
! database: Did not find a Realtime Database rules file specified in a firebase.json config file. The emulator will default to allowing all reads and writes. Learn more about this option: https://firebase.google.com/docs/emulator-suite/install_and_configure#security_rules_configuration.
i database: Database Emulator logging to database-debug.log
i pubsub: Pub/Sub Emulator logging to pubsub-debug.log
i emulators: Shutting down emulators.
i database: Stopping Database Emulator
! Database Emulator has exited upon receiving signal: SIGINT
i firestore: Stopping Firestore Emulator
! Firestore Emulator has exited upon receiving signal: SIGINT
i pubsub: Stopping Pub/Sub Emulator
! Pub/Sub Emulator has exited upon receiving signal: SIGINT
i auth: Stopping Authentication Emulator
i hub: Stopping emulator hub
Error: Cannot start the Storage emulator without rules file specified in firebase.json: run 'firebase init' and set up your Storage configuration
>
logcat output, etc.
The screen below also pops up when the error occurs.
Could you please help me to solve this problem? Thanks.
firebase.json =>
{
"firestore": {
"rules": "firestore.rules",
"indexes": "firestore.indexes.json"
},
"emulators": {
"auth": {
"port": 9099
},
"firestore": {
"port": 8080
},
"ui": {
"enabled": true
},
"functions": {
"port": 5001
},
"database": {
"port": 9000
},
"hosting": {
"port": 5000
},
"pubsub": {
"port": 8085
},
"storage": {
"port": 9199
}
}
}
firestore.rules =>
rules_version = '2';
service cloud.firestore {
match /databases/{database}/documents {
match /{document=**} {
//
// WARNING: These rules are insecure! We will replace them with
// more secure rules later in the codelab
//
allow read, write: if request.auth != null;
}
}
}
firestore.indexes.json =>
{
"indexes": [
{
"collectionId": "restaurants",
"queryScope": "COLLECTION",
"fields": [
{ "fieldPath": "city", "mode": "ASCENDING" },
{ "fieldPath": "avgRating", "mode": "DESCENDING" }
]
},
{
"collectionId": "restaurants",
"queryScope": "COLLECTION",
"fields": [
{ "fieldPath": "category", "mode": "ASCENDING" },
{ "fieldPath": "avgRating", "mode": "DESCENDING" }
]
},
{
"collectionId": "restaurants",
"queryScope": "COLLECTION",
"fields": [
{ "fieldPath": "price", "mode": "ASCENDING" },
{ "fieldPath": "avgRating", "mode": "DESCENDING" }
]
},
{
"collectionId": "restaurants",
"queryScope": "COLLECTION",
"fields": [
{ "fieldPath": "city", "mode": "ASCENDING" },
{ "fieldPath": "numRatings", "mode": "DESCENDING" }
]
},
{
"collectionId": "restaurants",
"queryScope": "COLLECTION",
"fields": [
{ "fieldPath": "category", "mode": "ASCENDING" },
{ "fieldPath": "numRatings", "mode": "DESCENDING" }
]
},
{
"collectionId": "restaurants",
"queryScope": "COLLECTION",
"fields": [
{ "fieldPath": "price", "mode": "ASCENDING" },
{ "fieldPath": "numRatings", "mode": "DESCENDING" }
]
},
{
"collectionId": "restaurants",
"queryScope": "COLLECTION",
"fields": [
{ "fieldPath": "city", "mode": "ASCENDING" },
{ "fieldPath": "price", "mode": "ASCENDING" }
]
},
{
"collectionId": "restaurants",
"fields": [
{ "fieldPath": "category", "mode": "ASCENDING" },
{ "fieldPath": "price", "mode": "ASCENDING" }
]
}
],
"fieldOverrides": []
}
it says : method does not override method from it superclass
The project is using an incompatible version (AGP 8.2.0) of the Android Gradle plugin. Latest supported version is AGP 8.1.4
See Android Studio & AGP compatibility options.
Hi,
I'm practicing with your FirebaseAdapter and I'm trying to implement the load more function, I mean, when you scroll down and you reach the end of the screen, the App should load more documents automatically.
This is called "pagination" according to the documentation here.
I have modified this:
public abstract class FirestoreAdapter.......... {
.....
........
private DocumentSnapshot mLastVisible;
@Override
public void onEvent(QuerySnapshot documentSnapshots, FirebaseFirestoreException e) {
....
..
...
..
..
...............
...
onDataChanged();
// Get the last visible document
mLastVisible = documentSnapshots.getDocuments().get(documentSnapshots.size() - 1);
}
public void setQueryForLoadMore(Query query) {
mQuery = query;
notifyDataSetChanged();
}
public DocumentSnapshot getLastVisible() {
return mLastVisible;
}
MainActivity:
mAdapter.setQueryForLoadMore(loadMoreQuery());
private Query loadMoreQuery() {
// Return ${LIMIT} documents after the last visible document from first query
return mFirestore.collection("posts")
.orderBy("timestamp", Query.Direction.DESCENDING)
.startAfter(mAdapter.getLastVisible())
.limit(LIMIT);
}
The new documents seems to be inserted correctly but, is not showing it on the screen.
If I do this:
public void setQueryForLoadMore(Query query) {
// Stop listening
//stopListening(); I commented this because this method is clearing mSnapshots
// Clear existing data
//mSnapshots.clear(); I commented this because I want to maintain the previous documents
notifyDataSetChanged();
// Listen to new query
mQuery = query;
startListening(); // If I comment this, still nothing appears after the previous documents
}
Still the new documents are not showing up.
Any idea how can I get the new documents to be added right after the previous documents?
logcat output, etc.// TODO(you): code here to reproduce the problem
I'm going to study Firebase using "Friendly Eats" sample source.
https://firebase.google.com/codelabs/firestore-android#2
I'm proceeding with the explanation number 5(Run the app).
The local emulator ran well.
You also created a account on the Authentication tab at http://localhost:4000/.
When logging in with the email generated from the login screen, the login process is not progressing due to a network error.
What should I do?
Error:(171, 9) error: cannot find symbol class CollectionReference
mRegistration = mQuery.addSnapshotListener(this);
"this" is getting me this error.
Error:(58, 56) error: incompatible types: FirestoreAdapter<VH> cannot be converted to EventListener<QuerySnapshot> where VH is a type-variable: VH extends ViewHolder declared in class FirestoreAdapter
NOTE: the interface EventLister is empty , so I just have to comment the
//@OverRide
public void onEvent(QuerySnapshot documentSnapshots, FirebaseFirestoreException e) {
Code bellow
/**
* Copyright 2017 Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.firebase.example.fireeats.adapter;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import com.google.firebase.firestore.DocumentChange;
import com.google.firebase.firestore.DocumentSnapshot;
import com.google.firebase.firestore.FirebaseFirestoreException;
import com.google.firebase.firestore.ListenerRegistration;
import com.google.firebase.firestore.Query;
import com.google.firebase.firestore.QuerySnapshot;
import java.util.ArrayList;
import java.util.EventListener;
/**
* RecyclerView adapter for displaying the results of a Firestore {@link Query}.
*
* Note that this class forgoes some efficiency to gain simplicity. For example, the result of
* {@link DocumentSnapshot#toObject(Class)} is not cached so the same object may be deserialized
* many times as the user scrolls.
*
* See the adapter classes in FirebaseUI (https://github.com/firebase/FirebaseUI-Android/tree/master/firestore) for a
* more efficient implementation of a Firestore RecyclerView Adapter.
*/
public abstract class FirestoreAdapter<VH extends RecyclerView.ViewHolder>
extends RecyclerView.Adapter<VH> implements EventListener {
private static final String TAG = "Firestore Adapter";
private Query mQuery;
private ListenerRegistration mRegistration;
private ArrayList<DocumentSnapshot> mSnapshots = new ArrayList<>();
public FirestoreAdapter(Query query) {
mQuery = query;
}
public void startListening() {
// TODO(developer): Implement
if (mQuery != null && mRegistration == null) {
mRegistration = mQuery.addSnapshotListener(this);
}
}
public void stopListening() {
if (mRegistration != null) {
mRegistration.remove();
mRegistration = null;
}
mSnapshots.clear();
notifyDataSetChanged();
}
public void setQuery(Query query) {
// Stop listening
stopListening();
// Clear existinkodig data
mSnapshots.clear();
notifyDataSetChanged();
// Listen to new query
mQuery = query;
startListening();
}
//@Override
public void onEvent(QuerySnapshot documentSnapshots, FirebaseFirestoreException e) {
// Handle errors
if (e != null) {
Log.w(TAG, "onEvent:error", e);
return;
}
// Dispatch the event
for (DocumentChange change : documentSnapshots.getDocumentChanges()) {
// Snapshot of the changed document
DocumentSnapshot snapshot = change.getDocument();
switch (change.getType()) {
case ADDED:
// TODO: handle document added
onDocumentAdded(change);
break;
case MODIFIED:
// TODO: handle document modified
onDocumentModified(change);
break;
case REMOVED:
// TODO: handle document removed
onDocumentRemoved(change);
break;
}
}
onDataChanged();
}
protected void onDocumentAdded(DocumentChange change){
mSnapshots.add(change.getNewIndex(), change.getDocument());
notifyItemInserted(change.getNewIndex());
}
protected void onDocumentModified(DocumentChange change){
if (change.getOldIndex() == change.getNewIndex()) {
mSnapshots.set(change.getOldIndex(), change.getDocument());
notifyItemChanged(change.getOldIndex());
} else {
mSnapshots.remove(change.getOldIndex());
mSnapshots.add(change.getNewIndex(), change.getDocument());
notifyItemMoved(change.getOldIndex(), change.getNewIndex());
}
}
protected void onDocumentRemoved(DocumentChange change){
mSnapshots.remove(change.getOldIndex());
notifyItemRemoved(change.getOldIndex());
}
@Override
public int getItemCount() {
return mSnapshots.size();
}
protected DocumentSnapshot getSnapshot(int index) {
return mSnapshots.get(index);
}
protected void onError(FirebaseFirestoreException e) {};
protected void onDataChanged() {}
}WARNING: The option setting 'android.enableBuildCache=false' is experimental and unsupported.
The current default is 'true'.
Affected Modules: app
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
An Open Source Machine Learning Framework for Everyone
Django
The Web framework for perfectionists with deadlines.
Laravel
A PHP framework for web artisans
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
Some thing interesting about web. New door for the world.
A server is a program made to process requests and deliver data to clients.
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
Some thing interesting about visualization, use data art
Some thing interesting about game, make everyone happy.
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
Microsoft
Open source projects and samples from Microsoft.
Google
Google ❤️ Open Source for everyone.
Alibaba
Alibaba Open Source for everyone
D3
Data-Driven Documents codes.
Tencent
China tencent open source team.