I wonder there is any way when user completely uninstall my app ,few days later a push notification asks user install new apps.
Is it possible?
You cannot perform operations after your app has been removed. Unfortunately there is currently no way for an Android package to execute code when it is removed. However, you can register a BroadcastReceiver for ACTION_PACKAGE_REMOVED in a different package that will be called when packages are removed from the phone.
Also see this question.
No there is no way except the client has installed two of your apps. But however don't do that!
Related
I'm trying to understand what exactly happens after my app gets updated on the users devices.
As of course the 'MainActivity' isn't launched, I am wondering about the services.
I have one START_STICKY service and one which is not, does the START_STICKY auto-start after the update, what about the other ?
Is there any way of testing this behavior without waiting for a real Play Store update ?
I looked for a documentation regarding this issue but couldn't find anything related.
I just did a quick test. Not sure how close this is to an actual update on the Play Store or if it is in any way comparable, but here goes:
I have created a simple app that starts two services on the click of a button, one START_STICKY one START_NOT_STICKY.
Both services create a notification in onStartCommand() and show a version number.
I create one release APK, change the version number in Manifest and notification, and create another release APK. I've copied the two APKs onto the phone and disconnected the phone.
I've manually installed the first APK on the phone, started the app, clicked the button, two notifications appear. Installed the second APK, without starting the app. The two notifications disappeared and did not re-appear either. Opened the app, clicked the button, both notifications appeared with the new version number.
From this it appears that neither service will be restarted automatically after an app update.
You could also publish your app on Google Play as an Alpha version and test an update of your app without annoying general users.
I am building a android application and I want to run this application in such a way that once it is installed in a device, that particular device should not be allowed to install any other applications. Basically restrict app installation to just one application(i.e mine).
I have looked at few options such a home launcher and tried but this allows me to install other applications as well. Is there a methodology where I can block other apps from getting installed in my device? Thank you.
You should take a look at this page:
http://developer.android.com/reference/android/content/Intent.html#ACTION_PACKAGE_ADDED
When a package has been installed, you should receive a new broadcast event with this intent.
Basically, you have to force uninstall or lock the app with that package id. You'll probably need to be root on the device if you want to avoid a new activity to show up.
I have created an app. Works great, but I want some same functionality as gmail uses:
When I receive a new email, I get a notification. I inspected my phone and saw no services or applications running that look like the gmail-app.
I have investigated the AlarmManager and services, but as soon as I stop the app both don't work anymore.
Could someone give me a hint how to accomplish this?
Thanks in advance
I inspected my phone and saw no services or applications running that look like the gmail-app.
Partly, that is because Gmail gets such notifications via broadcast Intents from the OS, via the subsystem we see as C2DM (which is why you do not see a process). Partly, that is because Gmail is part of the firmware and may get some extra benefits as a result, in terms of resisting the normal behaviors that befall an app that is force-stopped.
Could someone give me a hint how to accomplish this?
You can't. Particularly on Android 3.1+, if your app is force-stopped, it will not run again until the user manually runs one of your activities (e.g., from the launcher).
I have an android app, I want to run some process or show some message to user if he is uninstalling app, how to do that in android...
You could have a second app set up to receive a PACKAGE_REMOVED broadcast when the original app is removed. I don't think you can affect the first app being removed, but you at least you can react to it (to clean up files, etc.). That would only work, of course, if the second app was not removed first.
Not possible. If your user wants to uninstall your app, why do you think it would be OK to have anything pop up before they can do that?
Is there a way to get a system notification when an app has been uninstalled?
I would like to maintain a table of all clients' info currently using my app. However, that seems impossible if there is no way to detect this event.
The first solution I can think of is to have an always running service in the background listening for android.intent.action.PACKAGE_REMOVED. But then would that service be killed once the uninstallation process has ended, or would it be stopped just before the process has kicked off? Also even if this is a solution it's has the potential to put off a lot of people when they realise that part of the app is running in the background.
Any suggestions? Thanks!
You could simply do it the other way round and maintain a table of users actively using your app. Just call a webservice at a point in the program that show it is active. If an app isn't used for a certain time mark it as inactive.
The documentation for the PACKAGE_REMOVED action says the following:
The package that is being uninstalled does not receive this Intent.
So you can monitor for other applications being uninstalled but not your own.
So you'll probably need track who is still using your application, not who has stopped using it. If you don't want the overhead of having your own server to do this you could use a free service like Flurry.
From Android document, the app uninstalled by user can't not get
Intent.ACTION_PACKAGE_REMOVE
But we can use other method to implement this feature. We all know that there is a directory named with your package name under the /data/data directory after your app installed by user. If your app is uninstalled by user, the root directory of your app(/data/data/com.example.yourappname) will be removed by system. The remove action happen immediately when user click "uninstall", and the directory will be removed by framework package manager system.
So, we can monitor the existence of your app data directory(which usually /data/data/com.example.yourappname) to detect if your app uninstalled by user.
In order to monitor this directory, we have to fork a detached process from JNI.
In this new fork process, we can use Linux system api inotify(7) or access(3) to determine the existence of app's data directory.
Here is a workable implementation. But it got the permission problem when try to send an intent to start system browser on high version Android device. I have no idea how to bypass this. However the example above is enough for your question.
Hope it will be helpful!
Android doesn't provide an inbuilt function for tracking the app uninstall.
Notification can be used as an alternate way to track the app uninstall. For this send notification on the app and track the status of the notification. Count the number of undelivered notification for a particular time period. If status of undelivered notification doesn't change in that particular time period, then consider that the app has been uninstalled from the device.
For example, i have used a cron script which run every 3 days and check the status of last 10 notifications delivered to the device (2 notifications are sent in a day). If all of these 10 notifications have status "undelivered", then the app is considered to be uninstalled from the device.