I have an app that listens for notifications via NotificationListenerService. My app survives both the Doze mode and app stand by on almost any phone (if properly set-up e.g. exception or a foreground service).
Then come the Huawei and Xiaomi with their own modifications of Android to "improve battery life". These can mess with background running apps so badly that after a week or two the app must be reinstalled. Even clearing data will not "unfreeze" the app. Even exceptions to their own "optimizations" does not reliably fix this. Only completely disabling all their optimizations e.g. enabling "high performance mode" might fix this. But users do not want to disable these options.
How do you deal with these cases? And how can we stop manufacturers to stop messing with core Android? Not to mention the funny ANRs & crashes in Zygote :(
Then come the Huawei and Xiaomi with their own modifications of Android to "improve battery life".
Yes Xiaomi, Huawei and a few other manufacturers have their own layer of "Battery Saver" or "Security" that kills or restricts background running apps in order to improve security/battery backup, unless user white-lists your app in the relevant device settings.
What i found out about Xiaomi is that they white-list well known apps like Facebook, Whatsapp, etc. But you cannot request Xiaomi to white-list your app.
These can mess with background running apps so badly that after a week or two the app must be reinstalled. Even clearing data will not "unfreeze" the app.
These manufacturer apps simply terminate your app process. So your app should behave in such a way that termination at any moment should not create inconsistent state.
Also, you can always show a popup to user after installation asking him/her to go and white-list your app in battery saver. In Xiaomi, the user will need to select 'Do not restrict background activity' and also enable 'Auto Start' for your app. As far as i know, there is no other solution.
Let me know if you find one ;)
Related
We have a podcast player app, which works great on most phones, but some Samsung users are reporting that the stream stops playing when the screen turns off. We are using foreground services and notifications for playback with ExoPlayer.
After some investigation, it turns out that if you disable 'Put app to sleep' for our app in Settings -> Device Care -> Battery, it will work as expected.
Is it possible to automatically disable put app to sleep for our app?
I have read about the Samsung Knox API ApplicationPolicy.addPackageToBatteryOptimizationWhiteList(), but that requires requesting device admin rights for our app, which would be scary for the users.
From the documentation
An app holding the REQUEST_IGNORE_BATTERY_OPTIMIZATIONS permission can trigger a system dialog to let the user add the app to the whitelist directly, without going to settings. The app fires a ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS Intent to trigger the dialog.
Before asking the user to add your app to the whitelist, make sure the app matches the acceptable use cases for whitelisting.
By the way, shouldn't the 'Put app to sleep' be off by default for all apps? At least that's the case on my S8.
I have an open source gps tracking application that has been around for many years. Recently, I have been getting complaints that in android nougat, instead of getting updates once a minute, people are getting updates from the phone once every five minutes when the phone is unplugged.
There is something going on with the power saver mode even though we tried turning it off.
Is there a way to force a phone to get gps updates at a specified time when unplugged?
Here is the code if anyone wants to see it but I don't think it's a problem with the code. It has been very stable for years.
https://github.com/nickfox/GpsTracker/blob/master/phoneClients/android/app/src/main/java/com/websmithing/gpstracker/LocationService.java
thanks.
One change in Android 7/Nougat was that the Doze is now "more aggressive". In Android 6/Marshmallow the doze mode kicked in when the screen was off, the device was running on battery and it was stationary.
(This is documented in Optimizing for Doze and App Standby)
Now in Android 7 the conditions are just screen off and running on battery.
(This is documented in Android 7.0 Behavior Changes)
Apps can be white-listed to be exempt of the restrictions if they break the core functionalility of it. In your case they do as the GPS tracker needs to record coordinates in real time.
There's a list of Acceptable Use Cases for Whitelisting
This includes:
Task automation app | App's core function is scheduling automated
actions, such as for instant messaging, voice calling, new photo
management, or location actions.
Users can white list an app manually on their own in the device settings or whitelisting can be requested by the app and approved or rejected by the user.
This is covered in Support for Other Use Cases
Quoting:
An app can fire the ACTION_IGNORE_BATTERY_OPTIMIZATION_SETTINGS intent
to take the user directly to the Battery Optimization, where they can
add the app.
An app holding the REQUEST_IGNORE_BATTERY_OPTIMIZATIONS permission can
trigger a system dialog to let the user add the app to the whitelist
directly, without going to settings. The app fires a
ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS Intent to trigger the
dialog.
The user can manually remove apps from the whitelist as needed.
The last point is important of course, but luckily the whitelisting status can be checked programmatically:
An app can check whether it is currently on the exemption whitelist by
calling isIgnoringBatteryOptimizations().
So, dealing with the Doze mode is one thing to study at least.
Another issue is keeping the Service running in general. But the Service getting killed by the system might result in more random time intervals. There are of course the classic things like using START_STICKY or running as a foreground service.
I have a foreground notification service that continuously monitors user's actions, using ActivityRecognition, and writes them to AWS anytime user's state changes. It works good for some time. However I noticed when user is idle for longer time, such as user is sleeping overnight, then the app (activity and service) silently dies. I assume this is because of doze mode (because I whitelisted the same app on a different phone and it is working fine for over 2 days now)
How to WhiteList app in Doze mode Android 6.0 gives good overview on how to disable doze mode with user intervention. But #commonsware blog below suggests about Google 'possibly' banning the apps that show the corresponding popup box
https://commonsware.com/blog/2015/11/11/google-anti-trust-issues.html
Note: Google Play policies prohibit apps from requesting direct exemption from Power Management features in Android 6.0+ (Doze and App Standby) unless the core function of the app is adversely affected.
Can someone help me in understanding what features can possibly comprise "core functions", so Google would not ban my app. We know doze mode doesn't affect some apps like WhatsApp
EDIT
I see this on Samsung phones with 6.0.1
Android does not kill services in the background with Doze. Per the ActivityRecognitionApi documentation:
To conserve battery, activity reporting may stop when the device is 'STILL' for an extended period of time. It will resume once the device moves again. This only happens on devices that support the Sensor.TYPE_SIGNIFICANT_MOTION hardware.
Therefore it is entirely expected to have a significant period of time where you won't get any activity recognition callbacks. In those cases, you can assume that the last received activity (STILL) is still applicable.
I am trying to do a list of Android task killers that are installed by default on the operating system. The problem is that Android is modified by the phone's manufacturer and it is hard to keep up with what everyone is doing. So far I have found this:
Smart manager - On Samsung phones. Could not call alarm manager but you can avoid this if your package name contains "alarm" or "alert"
Doze - On Android 6. should not interrupt the app but it may delay alarm manager or network processes(especially if your app is not active and your phone is not charging).
Xiaomi , AutoStart . If AutoStart is disabled it seems that your application is completely shut down - no alarm, no broadcast receiver. I could not find a fix for this. The only way to do anything would be just to inform the user to whitelist your app. If you have another solution please share.
My question is if you encountered other task killer like these and how would be the best way to ensure that your application survives(without startforeground)
Thanks
consider also "Protected Apps" in Huawei phones
Unfortunately, there doesn't seem to be any solution for it. But what you can do is to identify such device manufacturers with "Battery Saver" apps or "Background Killer" apps. And display notifications to the users owning these smartphones (along with intstructions) to enable your app to process in the background manually.
A small tip for AlarmManager: you would have to reset all the alarms once again after the app is excluded from the blocked list.
So, far I have identified these manufacturers: Samsung, Asus, Xiaomi, Huawei.
Here is how to exclude the app from being disabled: https://stackoverflow.com/a/40992179/5129047
Okay, I'm pretty sure that this is not possible but a client had asked me to do so in one of our Android application we developed for her.
What she had wanted is that if our application is running, and user navigate to:
Settings > Manage Application > [Our Application]
, the button for "Force Stop" is disabled.
Is this possible? If it is possible, could someone point me out which way I should walk, or if it is not possible, how, using a valid argument based on facts, should I break the news to her.
Update:
She just sent me a screenshot that, in her opinion, validates her request that there's an Android application that disables "Force Stop" button. How am I supposed to explain this to her?
How to disable the "Force Stop" button
Short answer: Use the Device Administration API.
How to explain this to my client?
Show this to your client. It is a nice slideshow providing an easy-to-understand overview of the Device Administration API and its uses.
How do I demonstrate that it works?
Yes, back to your job. Use the API link provided above and the Api Demos included in Google's sample
collection to figure out how to integrate this into your app.
Build the demo and run it on your device.
Choose API Demos->App->Device Admin->General->Enable admin.
Choose Activate once the Device Administration API prompts you with its enabling screen.
Exit the app and attempt to manage the app via your device's settings menu (specifics for this step varies by device).
When viewing the Api Demo's "app info" screen, you should see both Force Stop and Uninstall are disabled.
How do I do this in my own app?
Review DeviceAdminSample.java in the Api Demos app for inspiration. You will need the following:
The following code is what brings up the activation screen:
// Launch the activity to have the user enable our admin.
Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, mDeviceAdminSample);
intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION,
mActivity.getString(R.string.add_admin_extra_app_text));
startActivityForResult(intent, REQUEST_CODE_ENABLE_ADMIN);
However, there are a few other pieces you will need to get this to work:
A broadcast receiver that derives from DeviceAdminReceiver.
Entries in your manifest file that refer to the above broadcast receiver.
Permissions in your manifest for using the Device Administrator API.
An xml file stating what policies your app can access.
All of this can be found in the above links. Good luck with your client!
This is not remotely possible, for great reason.
You should tell her that making this possible would be a huge security disaster. Imagine what would happen if you could create apps which just ate at your processor time by holding a wake lock, and you couldn't kill them. This would be horrible.
In general, if you're wondering if you can modify the "extra-app" behavior of the device, the answer is usually *no*. You should take the viewpoint that nothing on the device is yours to control besides your app and (to a limited extent) the resources to which you're granted access.
No other app has this kind of control, so it's not reasonable to expect that your client's would either. However, the fact that she's asking for this control usually implies something else: that they are worried the user will stop the app and then something bad will happen (the locations will stop being synced, data will stop being sent out to the net, etc...). This would imply that you should look into improving the resilience of the app to different situations. Remember, your app can even be killed off at any time by Android (for example, in the case of low memory).
I think the device screen shot has confused us. Even I can show my application that is installed on the device and the "Force Stop" button is disabled. Where as I have not done any thing specific to that.
The reason of the "Force Stop" button being disabled is, that particular application is NOT running currently. Hence there is not meaning in having the button enabled.
#Rhama you can ask your client to start the application once, press the home button of the device, and goto the settings and see. Surely the "Force Stop" button will be enabled this time.
Regards,
Rajan
From ICS, disabling Force stop is possible. If your app has an active device admin then the framework will not allow user to kill the process
Hey I think it is quite possible to disable the "Force Stop" button...check Kaspersky
Parental Control from the market it is doing the same.
Its service is running in the background then also the force stop button is disabled.
The application service is running in background
you can disable the forcestop when the app has admin rights. but soon as those admin rights are revoked then it is back to normal. however in android 4, an application called applock (domobile) was able to prevent that by asking a password when you tried to change admin rights. It could only be done by installing an extra program that applock asked you to. And I guess this might even be seen as a security flaw, infact it no longer works in Android 5.