I am creating an e-mail client in android. I want to receive the report when my e-mail is been opened at the receivers end. Eg. In outlook we have a read message request, if we use this option the sender will be notified about the message being opened at the receivers end. I used the eclient app from github to start with. I want to be strong on reporting side. any help would be appreciated..
You'd need the app to be installed on both ends. There's no way to know otherwise- you need to be able to run a program on the recipient's computer. Which is why everyone I know has stopped even trying read receipts in Outlook- if the recipient uses any other mail reader it won't send anything. Given the extreme unlikeliness of that happening for all possible recipients of email, this only makes even remote sense if you're in a locked down corporate environment where only your app is allowed to access email on any device.
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Im building a service that will send an invitation to an event through a WhatsApp group using whatsapp API.
Of course, it will require me to interact with the request to select the group and so on, which is OK, but there is no way (without expending money) for my app to "read" who will join.
I though in sending a link, which on tap, will generate an request on the guest to send me back an SMS, and then my app to "listen" and generate a database of those who agree to be in meeting (my app later will send another message to the group to confirm o cancel the meet according to the amount of people who get involved).
I think i can ask the people to send, but if i ask them to write the sms, they will not do it (lazy people).
There is a way i can write a link like "sms:myphonenumber?ImIn!" to send, so the device will build the SMS for them?
I know from a web u can do something like href:...., and will do the work for them, but not sure otherwise.
My app is using Google's C2DM (push notification) to notify users about new activity from friends. Once they install the app I register the device with C2DM servers and store user's phone number. So I know that the user is using my app and I can send him/her the push notifications. But what happens if users uninstalls my app, is there a way to catch it in my app? Or the only way is to catch an error on my server when I send a C2DM and it's unreachable, then mark a user as inactive?
I would love to notify users when their friends are using an app and when they no longer do.
What's is the best solution for this scenario?
The GCM documentation explains this situation here:
https://developers.google.com/cloud-messaging/registration#how-uninstalled-client-app-unregistration-works
"An application can be automatically unregistered after it is uninstalled from the device. However, this process does not happens right away, as Android does not provide an uninstall callback."
Basically when GCM tries to send the next push notification, the device will tell GCM the receiving application was uninstalled.
As for notifying friends that their friends aren't using the app any more, GCM will send a NotRegistered error to your notification server when this failure occurs; it won't be immediate, but could you use that?
Unfortunately the ACTION_PACKAGE_REMOVED intent will be sent out to all receivers except for your own. This is confirmed here.
Some questions for your C2DM plan, since I'm not very familiar with it. If the user just leaves their device off for a long period of time, will that trigger the error condition you use? How does C2DM actually report an "unreachable" device? Is that a condition that only occurs when it attempts to send the push notification and fails or is it when it somehow determines it reaches the device but fails to be handled properly? Obviously in the second scenario your plan would work, but I can see some "false positives" occurring otherwise.
Older SO question for reference: android not receiving Intent ACTION_PACKAGE_REMOVED in the removed package
Yes, but it is quite hacky.
The method is based on the fact that the first thing android does when uninstalling your app is deleting your data file. So you could use a file watcher to detect the deletion.
Also you need to write this in native code. If you write your code in java, your app will be uninstalled before it could execute any code.
please see this demo : https://github.com/sevenler/Uninstall_Statics
Google C2DM service is working in passive mode when it comes to detecting uninstalled applications.
First push notification after uninstalling your application (without unregistering from C2DM!!!) will NOT return any error in response. However, the second push notification will return an "invalid registration" or "not registered" error codes where you can realize the application was uninstalled.
The reason is that C2DM servers return the response code immediately and only then tries to push the client. When client respond that an application was uninstalled, it is deleted from C2DM servers. Next push attempt will return an error code immediately.
I have some points to tell you ,
Android community recommends you to use GCM instead of C2DM as it's no longer available.
In android there is no way for applications to get itself notified that app is getting uninstalled.
in GCM if you want to stop sending messages to uninstalled apps you can refer this
When you send messages to GCM from your server you will get response string.In that if you are getting error as "NotRegistered, you should remove the registration ID from your server database because the application was uninstalled from the device or it does not have a broadcast receiver configured to receive com.google.android.c2dm.intent.RECEIVE intents."
I know only one way with server response 200 with "NotRegistered" message in body.
NotRegistered — The registration_id is no longer valid, for example user has uninstalled the application or turned off notifications. Sender should stop sending messages to this device.
Look into this GCM doc:
GCM Unregistration
You should never unregister your app. This is taken care from server side.
To detect app uninstallation using Google Play Services, you can use the App Uninstallation Reporting API. This API allows you to receive notifications when your app is uninstalled by users. #ThanksChatGPT
My app is using Google's C2DM (push notification) to notify users about new activity from friends. Once they install the app I register the device with C2DM servers and store user's phone number. So I know that the user is using my app and I can send him/her the push notifications. But what happens if users uninstalls my app, is there a way to catch it in my app? Or the only way is to catch an error on my server when I send a C2DM and it's unreachable, then mark a user as inactive?
I would love to notify users when their friends are using an app and when they no longer do.
What's is the best solution for this scenario?
The GCM documentation explains this situation here:
https://developers.google.com/cloud-messaging/registration#how-uninstalled-client-app-unregistration-works
"An application can be automatically unregistered after it is uninstalled from the device. However, this process does not happens right away, as Android does not provide an uninstall callback."
Basically when GCM tries to send the next push notification, the device will tell GCM the receiving application was uninstalled.
As for notifying friends that their friends aren't using the app any more, GCM will send a NotRegistered error to your notification server when this failure occurs; it won't be immediate, but could you use that?
Unfortunately the ACTION_PACKAGE_REMOVED intent will be sent out to all receivers except for your own. This is confirmed here.
Some questions for your C2DM plan, since I'm not very familiar with it. If the user just leaves their device off for a long period of time, will that trigger the error condition you use? How does C2DM actually report an "unreachable" device? Is that a condition that only occurs when it attempts to send the push notification and fails or is it when it somehow determines it reaches the device but fails to be handled properly? Obviously in the second scenario your plan would work, but I can see some "false positives" occurring otherwise.
Older SO question for reference: android not receiving Intent ACTION_PACKAGE_REMOVED in the removed package
Yes, but it is quite hacky.
The method is based on the fact that the first thing android does when uninstalling your app is deleting your data file. So you could use a file watcher to detect the deletion.
Also you need to write this in native code. If you write your code in java, your app will be uninstalled before it could execute any code.
please see this demo : https://github.com/sevenler/Uninstall_Statics
Google C2DM service is working in passive mode when it comes to detecting uninstalled applications.
First push notification after uninstalling your application (without unregistering from C2DM!!!) will NOT return any error in response. However, the second push notification will return an "invalid registration" or "not registered" error codes where you can realize the application was uninstalled.
The reason is that C2DM servers return the response code immediately and only then tries to push the client. When client respond that an application was uninstalled, it is deleted from C2DM servers. Next push attempt will return an error code immediately.
I have some points to tell you ,
Android community recommends you to use GCM instead of C2DM as it's no longer available.
In android there is no way for applications to get itself notified that app is getting uninstalled.
in GCM if you want to stop sending messages to uninstalled apps you can refer this
When you send messages to GCM from your server you will get response string.In that if you are getting error as "NotRegistered, you should remove the registration ID from your server database because the application was uninstalled from the device or it does not have a broadcast receiver configured to receive com.google.android.c2dm.intent.RECEIVE intents."
I know only one way with server response 200 with "NotRegistered" message in body.
NotRegistered — The registration_id is no longer valid, for example user has uninstalled the application or turned off notifications. Sender should stop sending messages to this device.
Look into this GCM doc:
GCM Unregistration
You should never unregister your app. This is taken care from server side.
To detect app uninstallation using Google Play Services, you can use the App Uninstallation Reporting API. This API allows you to receive notifications when your app is uninstalled by users. #ThanksChatGPT
Polling for mail uses up battery life and can't be done too often. I have written a Qt program to run on my always on server and use the IMAP IDLE command to notice mail nearly instantly and send me a SMS message when mail shows up in my account. That allows me to see the text message in a timely fashion and then go read mail and manually sync to actually fetch the message (very handy for the mail account I have setup for things like traffic alerts). I can then save battery life by turning off sync on my mail account.
The next obvious step is to get a mail client that looks for the specially formatted text messages and pulls the mail down itself. Any mail client developers out there who'd like to add a poll via sms option to their client? (Just curious).
What you're looking for is the Android C2DM (Cloud to Devices Messaging). It's the in-house push-notification framework that Android uses for gmail (and almost everything else Google-related).
It differs from SMS in that the C2DM message does not have the burden of guaranteed delivery and its payload is much smaller than an SMS message -- so very little content can be delivered on it, only a reference to the content can be delivered through it.
It's been rolled out to third party developers through a limited Beta (if a developer attended Google I/O, they'll have priority to get into that Beta program), but Google has been delaying the official launch of C2DM to everyone else in the developer community repeatedly for quite a while now.
I would like my Android application to react to an incoming email from specific address.
I've heard that you can do it with incoming SMS, but emails are cheaper. Unfortunately, I am not an expert on Android's "intents", so would be really grateful for your help.
There are no documented broadcast Intents for the receipt of emails. As such, what you are trying to do is not possible without either writing your own email client, or contributing to another one (e.g., K9).