problem:
My flutter app did not launch or more precise was stuck in launch screen because I had to many other apps in the background e.g. Gallery, Camera, Browser etc. and so on. After closing those sleeping background tasks my flutter app launched like expected.
Questions:
A) Is it possible to e.g. open a dialog and inform the user of the nature of the problem. E.g. close some apps, please. Your cell phone ran out of Memory? If so, how? There are alot „change splash screen“ tutorials, would this be the correct place to implement such logic or is another widget preferable?
B) I know closing other apps is not possible due to android OS restrictions. But may be someone has another idea to atleast inform the user about the issue?
Best regards
Hugo
I am an android developer and i created an android app which has a background service running.
I have basically created an app which shows chat heads whenever a notification arrives. user can tap on that chat head and reply to that message without opening native messaging app. (Just Like Facebook Messenger with chat heads).
My app runs very smooth in some devices like Vivo, Oppo. But it lags very much in some devices like Samsung and MI. I don't know what is going on here. My app has clean code and never crashes, it just lags and make the phone slower. on the other hand it runs very smooth in some deices.
I tried google but did not find any useful tips. I just want to know that if there is any way to detect the main cause of this lagging issue in some devices. App never crashes, never got any exceptions, don't have any error in code, but still it makes some deice slower and lags.
If anyone can help me finding the main cause of this lagging issue, then it would be a great help.
Thank you in advance.
you can use android studio profiler option to check whats causing lag in your app:
https://developer.android.com/studio/profile/android-profiler
ref tutorials:
https://heartbeat.fritz.ai/profiling-your-app-with-android-studio-7accc268cb98
Samsung Galaxy S6 with Android 6.0.0 and 6.0.1
My app runs fine, code analysis shows no mem leaks. SmartManager shows that the app uses ~40MB of memory. I kill the app (using the "currently running apps" overview--- not sure how that's called in English, sorry. The key on the bottom left of the phone, that shows a list of miniatures of all running apps...), then start it again.
Now SmartManager no longer shows ~40MB of memory for my app, but ... more. 50. 100. 400. It varies, but growing each time. After awhile, my app actually crashes with an OutOfMemoryException. Sometimes even with "out-of-memory while trying to throw an OutOfMemoryException"...
I have to de-install and re-install the app in order to reset its memory consumption. The same APK behaves correctly on all other phones I've tested with (e.g. S5 with Android 5.0). No idea what's causing this. No idea what could be causing this! Any help/hints/suggestions...?
Edit: Same behaviour on S5 with Android 6.0.1, but not on S5 with Android 5.0!
Edit2: Thanks, everyone who contributed. I still don't have an answer that I'm satisfied with, but a few ideas were mentioned that I will look into. Most people were focusing on the MemLeak issue, and while that sounds reasonable I'd like to stress that there is no leak occuring on Android 4 or 5, only 6. (I have yet to test 7.) Also, the leak only occurs when I forcefully kill the app (which I need to do at times to test proper shutdown and re-start behaviour), and only without a debugger attached (which makes testing/debugging this behaviour a pain in the backside).
The app starts one service as a bound service. Bound to the application context--- which according to the docs should clean itself up when the app stops.
Unfortunetely, time for this bounty is running out. So far, the above mentioned service seems to be the most likely source of my problem. As such, I will award Qamar the bounty, as he was the first to mention this both in the comments and his answer. The rest of you, a big THANK YOU and up-vote.
In Android Studio, click Android Monitor at the bottom of your screen. Click the tab Monitors. You see a graph of the memory that your app uses. Now click the item Dump Java Heap which is next to the garbage van. The system starts collecting the info and creates a dump file. You can open the file in the Analyze Tasks tab in the upper right of your Android Studio window. Press the green arrow to find classes that leak memory. When you click a leaking activity, you'll see a window Reference Tree. Go through the tree, finding the member that has depth zero. That's the memory leak.
Analyse your code and images if anything wrong you are doing itself. Like very large images of drawables. make sure you correctly implement recycler or list views.
The following links may helpful to you.
Use leakcanary library to detect and make sure there is not leaks
Detect when user kill app from reccent apps
Invoke gc from memory monitor comes with Android Studio for correct value of memory usage cause gc not run frequently.
Use large heap size. <application android:largeHeap="true" in manifest
Use app context to start servicesstartService(new Intent(getApplicationContext(),MyService.class));
Your application has some threads are timer tasks that are creating again and again and they are utilizing many resources related to networks so your heap size is consistently increasing and at sometime your app is out of memory and crashes.
Some people think that task killers are important on Android. By closing apps running in the background, you’ll get improved performance and battery life – that’s the idea, anyway. In reality, task killers can reduce your performance.Android isn’t Windows and doesn’t manage processes like Windows does. Unlike on Windows, where there’s an obvious way to close applications, there’s no obvious way to “close” an Android application. This is by design and isn’t a problem.When you leave an Android app, going back to your home screen or switching to another app, the app stays “running” in the background. In most cases, the app will be paused in the background, taking up no CPU or network resources. Some apps will continue using CPU and network resources in the background, of course – for example, music players, file-downloading programs, or apps that sync in the background.When you go back to an app you were recently using, Android “unpauses” that app and you resume where you left off. This is fast because the app is still stored in your RAM and ready to be used again,hence consuming no further resources.
Task killers like smart manager think they know better than Android. They run in the background, automatically quitting apps and removing them from Android’s memory. They may also allow you to force-quit apps on your own, but you shouldn’t have to do this normally.If a task killer removes an app from your RAM and you open that app again, the app will be slower to load as Android is forced to load it from your device’s storage.Further s6 has Smart Manager and could be used as a widget or shortcut to battery and storage settings,however you should avoid using the Clean All optimization feature. This feature is said to improve device performance – as the Clean Master app aims to do – but its actual impact is questionable.
Meaning while still sometimes you kill an app it can still leave the traces on heap so next time when you start it ,it will show varyingly more amount of storage used which also fails the notion of default maxMemory() and the app ultimately might crash.Further such leaks are difficult to track as they aren't directly associated to app you killed in first instance.But still sometimes even after killing app, certain features like resources attained may keep running in background without even the app even knowing about them.i.e unnoticeable leaks.Thus you may want to use maxMemory()
which can be invoked (e.g., in your main activity's onCreate() method) as follows:
Runtime rt = Runtime.getRuntime();
long maxMemory = rt.maxMemory();
Log.v("onCreate", "maxMemory:" + Long.toString(maxMemory));
This method tells you how many total bytes of heap your app is allowed to use.
Optimal Behaviour:
An app can stay "running" in the background without any processes eating up your phone's resources. Android keeps the app in its memory so it launches more quickly and returns to its prior state. When your phone runs out of memory, Android will automatically start killing tasks on its own, starting with ones that you haven't used in awhile.
What You Should Do Instead
That said, not all apps are created equal. Many of you have used task killers in the past and actually found that after freeing up memory, your phone works a bit better. It's more likely that this is because you've killed a bad app that was poorly coded, and (for example) keeps trying to connect to the internet even when it shouldn't. Any performance increase you experience is more likely because you killed the right app, not because you freed up loads of memory (or, in many cases, it's just placebo). Instead of killing all those apps, find out which ones are actually causing the problems.using a task killer to deal with a misbehaving app is like using a shotgun to kill a fly – you may fix your problem, but you’re inflicting a lot of other damage in the process.Now
since S6 has 3 gigs of ram,it should'nt have problems,however implementation of smart manager can cause problems with some apps and isnt necessarily android version dependent.Also bare that heapsize tends to be based more on screen resolution, as higher-resolution screens tend to want to manipulate larger bitmaps.
Instead of using a task killer in this situation, you should identify the bad app and uninstall it,or debug it, replacing it with an app that works properly. To pin down the app that’s misbehaving, you can try the
Watchdog Task Manager app
– it will show you which apps are actually using CPU in the background, not which apps are harmlessly being stored in memory.
Captivating Fact:
CyanogenMod, the popular community-developed Android ROM, won’t even
accept bug reports from users using task killers, saying that they
cause more problems than they solve.
A probable cause of issue
if you can try following at once,first of all go to settings >sounds and notifications > App notifications > select smart manager and select hide content on lock screen
then again back to settings go to lockscreen and security >Device security >Disable KNOX active protection and deactivate the anti malware option below KNOX active protection
in lock screen and security go to other security settings > disable send security reports and go down to ussage data access> disable smart manager so after that restart your device.Now see if the app works Also see performace concerns with s6
I just learned Android from scratch and built an app with simple process using Android Studio.
The app has one process with repeating Alarm manager which will toast a message after 10 mins. That's it.
However, once I install it on a real device, after an hour or so, the device will ask to Share Bug Report. When I do share it,(via e-mail to my self), it is just a blank black screen..!
This happens with any device. I tried it on 3 devices so far. It is like:
Device before my app: Normal functioning.
Device after installing my app (after an hour or 2): A pop up comes
up with 'Share bug report'.
PS: I have not written any code to call or share bug report or any popup.
Has anyone come across this strange behavior?? Any idea on what is happening here??
EDIT 1: It is not just a blank screen but there is a word doc with lengthy set of code. It basically contains the entire lump of data of entire system. Not just my app..!
Probably your app is freezing or stops responding.
Analyze your app logs, you will find the cause.
Did you read these threads ?
What does it mean with bug report captured in android tablet?
http://android-developers.blogspot.com/2010/05/google-feedback-for-android.html
I've started Android Development and I'm using Eclipse for the first time in years, coming from a Visual Studio background. When I click Run in Visual Studio I begin to get feedback immediately. Using Eclipse however, I get very little feedback and it's only after a few clicks of the run button.
It normally takes a few minutes for the app to run after making even only the littlest changes to the UI XML, and I will see nothing in the LogCat or Console tabs. I'll click run.... nothing, click run again after a few minutes.... nothing, click it again after a few minutes.... and finally it'll give me some feedback that it's launching the app.
Is there any way to improve the responsiveness / feedback I'm getting?
Yeah....just waiting. You don´t have to push the run button many times. I would be happy if there where another solution, but fact is, that the emulator is terrifying slow. Even this depends on the properties from which You created your AVD. There are some setting when creating a new one, internal storage and ram size. The lower these values are the faster it creates an emulator. This depends on what You need, if You don´t need sd card storage, disable it. If you don´t need much ram size, set the minimum. Even there are some tricks to speed up a little bit:
http://developer.android.com/tools/devices/emulator.html#acceleration
It seems that there is a faster alternative emulator, but I hadn´t tried it:
http://enisgeeks.wordpress.com/2013/03/21/an-amazing-alternative-to-android-emulator/