android how to fill TextInput in another application - android

We have to test application from other vendor(out client) and we need to fullfill text input from our android app(service) and get some info back.
Only way I see now - injects like Instrumentation.sendPointerSync(motionEvent);
But how to do it, if we working from our service to different real activity? Or maybe here is any more elegant solution to send text and push buttons in other app with rooted device as basement?

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Android application for creating aliases, needed functionalities

I would like to create an android application that will allow to define and use of aliases when entering text on the keyboard by the user in the entire system/where possible. Something like the "Texpand - Text Expander" application.
For example:
If we write an SMS, after typing 'wu', a option appears above the keyboard with the option of clicking and expanding this shortcut to the one previously defined in the application, e.g. 'What's up?'.
How can we keep an eye on user keyboard's input from other components and constantly communicate with our aliased application? After installing Texpand, I can see that it uses Services, but I haven't found a way to constantly watch the inputed keyboard's text and synchronize it with the application.
Should I use WindowManager for the option that appears after entering the alias or are there any other methods?
Stack: Kotlin&Compose
I've learned about services, but is there something more needed?

scroll android programmatically in all applications

I created a background service on android and I have two buttons which appear on the top of the screen all the time. I want to use these two buttons like scroll down and scroll up. But these two buttons should work on any kind of applications like Instagram, Facebook, Twitter and so. So, it means it should work in all applications that use scrolling.
I search a week on internet but I could not find any solutions.
This is not possible, sorry. Something like this would require your Service to have access to the Views of the applications and this would be a huge security breach, because you could read values from them and so on.
You could achieve this with a custom button code broadcast (so basically your buttons would act as physical buttons on the device) but this would most probably require you to have system-level permissions and some level of cooperation with the OEMs.
Android Activity class has a method called dispatchKeyEvent(), which could let you simulate the key input (with some limitations) but this is not present in the Service class.
Sadly this is not something you can do in Android. Typically you should not be able to touch views with a background service, the point of a background service is that you do some work in it (for example upload files to your web server or get some data). You CAN send a signal from a service once you're finished doing work to tell an app that something needs to happen, however the app needs to be specifically coded to respond to this broadcasted event.
If you wanted to do this with an app that you have developed, that can be achieved by using the onReceive method of say a BroadcastReceiver, however you cannot specifically define the behaviour of other apps as this would represent a security breach in Android.

Android . Activating my application when some string was entered in some other application

I am trying to create a behavior where entering some string in any application will open my application.
I've tried looking around on how to listen for keyboard press or listening for text change, but I couldn't find my required behavior and I don't want to create a custom keyboard for this.
If this is not possible, what will be a good implementation for lunching my application as fast as possible while in the other application?
Answered before the requirement to "don't want custom keyboard"
The only viable way that I can think of is if the user was using a custom keyboard written by you. Custom keyboards can and do act as key-loggers and therefor could detect any key combination, or written word and allow you to execute your code when your conditions are met.
Rerfer to Creating an input method docs
How to open my app as fast as possible from another application?
Press home, launch your app by clicking on the launcher icon
But assuming you mean without doing that, you'll still need to monitor some event, say volume keys pressed or device being shaken for instance, or have you app be running already in the foreground such as what Facebook messenger does (or used to do, I don't know)
Related questions:
What APIs in Android is Facebook using to create Chat Heads?
Listen to volume buttons in background service?
How to detect shake event with android?
Demo of bubbles

Android: How to program changes to the standard android sms GUI

I want to write an android app that changes the android standard message sms GUI giving it an extra send button. The one send button should be the usual one and the other should be the one that uses my application to send the message. How do I add this extra button in the android standard sms message GUI? Anyone got an example code on how to do this?
Kind regards
Benjamin
Ok, this you Cannot do for phones which are in the market. You will need to grab hold of the sources and come up with a custom ROM for users to flash.
However, as another option, you can build your own SMS application and let users install so. When users need to send a SMS, they will be asked whether we default/your app needs to be used. This way is a much cleaner approach and more reachable to users.

Screen to show app output inside app in android

I'm writing an android app just to get familiar with the OS and API. I'd like to show what my app is doing to the user in a seperate screen and not via notifications. The reason is that I'd like to show the user exactly what the app is querying and how long it took etc. I saw an example of this in the superuser app which shows what the app is doing when it is updating itself.
Is there a library to do this?
Is it as simple as just showing a text box and then populating it programatically?
I would have done it so..
Just push state changes to your UI thread and display them there.
You can do that via BroadcastReceiver, which is intended to let background services communicate with UI activities, or LocalBroadcastManager which is simpler version of the previous.
Here on StackOverflow you will find dozens of questions describing how to implement it.

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