lucas houmga
19-Dec-19 22:47
I
'
m looking for a way to implement a simple list view scrolling in my Firebase app, but I am not getting any way out how to implement this. I have already tried 2-3 tutorials and documentation available on the Internet, but didn'
t the required result.
In my app I want scrolling like at starting first
10
list items load then each time on scrolling next
10
or
20
items will load until the last item appears at the bottom of the list.
So I tried retrieving first
10
items the following way :
<pre>private
void
readsposts(){
DatabaseReference reference = FirebaseDatabase.getInstance().getReference();
reference.keepSynced(
true
);
reference.child(
"
Posts"
)
.limitToLast(
10
)
.addValueEventListener(
new
ValueEventListener() {
@Override
public
void
onDataChange(DataSnapshot dataSnapshot) {
postList.clear();
for
(DataSnapshot snapshot:dataSnapshot.getChildren()){
Post post = snapshot.getValue(Post.
class
);
for
(
String
id:followingList){
if
(post.getPublisher()!=
null
&& post.getPublisher().equals(id)){
postList.
add
(post);
if
(post.getPublisher()!=
null
&& post.getPublisher().equals(firebaseUser.getUid())){
postList.
add
(post);
postAdapter.notifyDataSetChanged();
mProgressBar.setVisibility(RecyclerView.GONE);
@Override
public
void
onCancelled(DatabaseError databaseError) {
mProgressBar.setVisibility(RecyclerView.GONE);
In the above code, as you can see I am generating Log to check if data is fetched from the firebase, but I got no output Android monitor.
I have no idea how can I implement Firebase Scrolling in my Recycler view. I think this is a common problem for those who implement infinite-scroll in recycler view/ list view.
Could you please help me implementing this feature. Thanks.
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Re: Firebase infinite scroll list view Load 10 items on Scrolling using firebase realtime database "Android Project"
Exoskeletor
13-Mar-20 1:58
I have a good working code for infinite scroll that gets item from online service(parse server) but it is in xamarin, you want me to post it?
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If we're being brutally honest:
I realize that English may not be your first language, but there is quite a bit of cleanup needed in the two paragraphs (e.g., "For instance
[comma]
the plate in the center has
four
neighbors"). Individually, not necessarily a big deal, but altogether, it makes for a less-than-professional offering.
What's the former order? How do I know if I'm making progress, or simply further rearranging the "plates?"
All of the screenshots seem pointless. It reminds me of those "find the differences between thee two pictures" activities that we played as kids, except in this case, it's just colored squares.
If the game does not work when the device's orientation changes, then don't allow it. Telling the user to not rotate their device is just wrong, and comes across as amateurish.
Keep going. You'll get there.
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
modified 5-Dec-19 9:00am.
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Dont use whats new play store section to write app features, only use it for update changelog
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trying to figure out how exceptions propagate and should be handled.
My Visual Studio 2019 test solution consists of:
1. C++Dynamic Library (.so), Target API Level android-27, exceptions enabled with "-fexceptions" flag
2. Android 9.0 (Pie) test application using library above, in OnCreate method exception handling is added as follows:
AndroidEnvironment.UnhandledExceptionRaiser += (sender, e) => ...
TaskScheduler.UnobservedTaskException += (sender, e) => ...
AppDomain.CurrentDomain.UnhandledException += (sender, e) => ...
When I throw exception in the library:
Android application ends execution. No exception is caught.
What I can see in the Android Device Monitor is:
signal 6 (SIGABRT), code -6 (SI_TKILL), fault addr --------
Abort message: '/usr/local/google/buildbot/src/android/ndk-release-r16/external/libcxx/../../external/libcxxabi/src/abort_message.cpp:73: abort_message: assertion "terminating with uncaught exception of type int" failed'
So it seems that all exceptions should be handled in the C++ code.
In case of external libraries I can write a wrapper and handle exceptions.
Is this is a right way, or did I miss something?
If this is the right way I am looking for a documentation reference confirming it. Assuming there is any.
My test program can be accessed here
https://github.com/wakeup44/TestSample
wakeup
modified 27-Nov-19 4:54am.
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Hello all.
1- I register a BroadcastReciever in a service dynamically, and then start service. Now if app crashes or I stop service manually, will this also kill the BroadcastReceiver?
2- Same question for ContentObserver. I add ContentObserver for listening changes to addition/updation/deletion of contacts. Will this ContentObserver be also killed if somehow the service is destroyed
Thanks for any input.
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You could probably find the answer by running the code in the debugger and killing the service.
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Since its appearance several years ago, Kotlin has become very popular among Android developers. Google has already announced its official support. According to
Stack Overflow Developer Survey 2018
, Kotlin is the 2nd most loved language and the fourth most wanted worldwide. So, what do you think about the global migration from Java to Kotlin? Will it be?
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Quote:
Do you believe that Kotlin will become more popular than Java?
Languages come, languages go. In my—almost 7 wasted years of development with community—experience I have seen languages being introduced, and languages being left to die. When I started learning, people told me to not use Windows Forms as it was dead, guess what? It is still being used and is still available in .NET Core 3.0—a completely revamp of the framework! So it is irrelevant as to what is better or what is not.
Everything has its own place, you cannot do database programming with C#, no matter how much you improve Entity Framework (Core).
Quote:
Kotlin has become very popular among Android developers
It has, ever wondered why? The reason was that Java lacked so many important features that a programmer might require. There is no operator overloading, generics are only compile-time, static functions are available on instance functions, asynchronous support (although available with community-written module) is very poor, infact bizarre. Moreover, several of the language constructs that could have helped improve developer experience and productivity were never included up until Java 8 and beyond.
Now Java is looking at the lambda features, and is about to introduce the var keyword, which C# and others had a decade ago. Man, a decade ago!
So it is not that Kotlin is gaining popularity, rather Java is becoming a very frustrating language to work with.
Quote:
So, what do you think about the global migration from Java to Kotlin? Will it be?
It has already happened, read your own post again.
A professional tip that I would want to give you here would be, if you really want to learn something new for Android development, go learn Dart and use Flutter. I have been using several cross-platform tools and runtimes to develop apps, I have used Xamarin (and Xamarin.Forms), React Native, and Flutter. Here is one of the apps that I developed using Flutter, the development experience that I have had so far is almost unparalleled,
Afzaal Ahmad Zeeshan / cloud-storage-flutter · GitLab
, explore the source code and see how easy it is to create activities, new controls, provide state-management mechanisms, and much more.
I think Flutter has a bright future, and Dart as a language is really interesting language and provides a Java-like syntax, but amazing features as if TypeScript, C#, Java and C++ had a baby...
Flutter - Beautiful native apps in record time
No, not in that way, man. :facepalm:
The sh*t I complain about
It's like there ain't a cloud in the sky and it's raining out - Eminem
~! Firewall !~
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I am a newbie here in Android, however, I do know one thing. Whenever you install Android Studio, Kotlin is the "Default" language.
That says, GOOGLE is 100% behind Kotlin.
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No. It was not Google, rather the Android development community that was behind the Kotlin adoption. The community then led Google to officially start support for Kotlin.
Google announced Kotlin priority programming language for developing Android applications - DEV Community 👩💻👨💻
The sh*t I complain about
It's like there ain't a cloud in the sky and it's raining out - Eminem
~! Firewall !~
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Kotlin
is
fancy however regardless of whether I got why and how conclusion and scala have been made, I didn
'
t actually comprehend the motivation behind Kotlin. The Java language is at a generally excellent spot, the additional layer Kotlin gives doesn'
t appear to be relevant enough
It
is
fancy, it finishes a few things, yet the business guidelines are better on each end IMHO. I read a contention saying that it
is
extremely simple doing parallelism
in
Kotlin since java
8
is
additionally very simple getting it done.
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I'm going to attach my .jar file to an already running apk in emulator(BlueStack). I can attach .jar file to running java application on windows. But for running apk in emulator, it is not the same. Any help for me. thanks.
modified 10-Oct-19 12:50pm.
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What do you mean by
"attach my .jar file to an already running apk"
? How do you plan to attach it?
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Thanks for your reply. I have one apk, but no project of it. At running time of the apk in emulator, I want to hook some functions of apk to get some information, so I'm going to inject my .jar to it. Before I have injected my agent jar file to running java application, but in case of apk I have no idea. Please help me.
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Sorry I have no idea how that could be done. I would suggest a better idea would be to use the
Android Debug Bridge (adb) | Android Developers
[
^
].
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There are a lot of android emulators are available that help you run the apk files
in
the PC. some of them are like bluestacks ,andy,coplayer,AMyDuos.Besides that you can install andriod
in
vmware and install apps
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Hello there. I am setting a click listener on a relative layout. It works fine. But today I got couple of crashes on this
click listener
from the user. I set this click listener in the
onCreate()
function of the activity. Here is what my code looks like
@Override
protected
void
onCreate(Bundle savedInstanceState) {
layoutHomeButton = findViewById(R.id.layoutHomeButton);
layoutHomeButton.setOnClickListener(
new
View.OnClickListener() {
@Override
public
void
onClick(View view) {
And following is the exception I get
java.lang.RuntimeException:
at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:
3021
)
at android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:
3156
)
at android.app.servertransaction.LaunchActivityItem.execute (LaunchActivityItem.java:
78
)
at android.app.servertransaction.TransactionExecutor.executeCallbacks (TransactionExecutor.java:
108
)
at android.app.servertransaction.TransactionExecutor.execute (TransactionExecutor.java:
68
)
at android.app.ActivityThread$H.handleMessage (ActivityThread.java:
1864
)
at android.os.Handler.dispatchMessage (Handler.java:
106
)
at android.os.Looper.loop (Looper.java:
205
)
at android.app.ActivityThread.main (ActivityThread.java:
6991
)
at java.lang.reflect.Method.invoke (Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:
493
)
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:
884
)
Caused by: java.lang.NullPointerException:
at com.hiclass.earthlivecam.publiccam.earthcam.webcamhd.ui.activities.ActivityPlayVideo.onCreate (ActivityPlayVideo.java:
210
)
at android.app.Activity.performCreate (Activity.java:
7159
)
at android.app.Activity.performCreate (Activity.java:
7150
)
at android.app.Instrumentation.callActivityOnCreate (Instrumentation.java:
1272
)
at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:
3001
)
what am I doing wrong? Thanks
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layoutHomeButton = findViewById(R.id.layoutHomeButton);
It may be that the above line failed, so
layoutHomeButton
is null and causes the exception. Use the debugger to see if that is the case.
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Then something else must be the problem, but it is impossible to guess what. You need to look at ActivityPlayVideo.java:210 if it is available.
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layoutHomeButton = findViewById(R.id.layoutHomeButton);
if
(layoutHomeButton !=
null
)
layoutHomeButton.setOnClickListener(
new
View.OnClickListener()...
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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