at the moment it only I can send data between the mobile and wear app while the app is already open on both the mobile and the wear app. Is there any way that I can start up the wear app from the mobile app instead?
You have to implement a Message Listener Service,
check this question and my answer
How to launch android wear activity from mobile
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I am working on a WearOS application. This app is connected to an android device via bluetooth. I have created an app in that android device too. I want to launch that android app from my watch app by a button. I don't know how can I make my WearOS app to launch an specific app that I created in the android device.
I have learned to launch implicit intent using androidx.wear.remote.interactions.RemoteActivityHelper but it seems to work only with implicit intents.
I want to create an app for Wear OS to replace the default Messages app for handling SMS/MMS messages. To start with, my app will get messages from the phone, relying on the phone to communicate with the cellular carrier. What does my replacement app need to do to send and receive SMS/MMS messages from the phone?
Can my app communicate with the default Google messaging app on the phone (so I don't have to write a phone app too)? Is that protocol/API documented somewhere?
Does my app need to register with the watch to become the default message handler and disable the default app? If so, how do I do that?
Does anyone know if it's possible to control a smartwatch app (Android Wear) through a smartphone app. An example would be to switch to another page in the smartwatch app by clicking a button in the smartphone app.
Yes it is possible, there are API's to communicate wearable. For example you can send messages between phone and wearable using the MessageApi. Check this training page for how. Or you can use BusWear library for sending events between phone and wearable.
I want to send a notification to an android app based on some changes in the watch accelerometer, the watch is gear 2 running tizen. I can send notifications from android to the watch but not vice versa. How would I proceed with this ?
You can create Producer-Consumer (Companion) App using Accessory SDK. One for Android and one for Tizen gear. Add listeners in Tizen app and send data to android app when there is change in accelerometer reading.
You can refer Accessory SDK for more developing conpanion apps.
I am developing a package manager application which shows checkboxes to turn off notifications from different applications installed on the Android device.
Since Android 4.1, users can turn off notifications of an app from application manager. Can I turn on/off notifications from an app programatically? Is there an API for doing that?
No, you cannot do that from your code. Perhaps on rooted devices you could do some magic, but that shall not really count for wider audience.
If you are App dev, you should manage that on server side, having a webservice (REST API) allowing the user to unsubscribe to the notifications.
Then implement a Settings section in your App where user can uncheck a notification box and that call this service.
Then, your server will not send the notification to this user.