service - Android Key logger

Question

Intro: I want to create a POC on Android Security which requires to identify if there is any KeyLogger running on Android device or not. And if it is running or installed on device then, disable it throughout my Android application.

Queries:

1.) Is this possible to create Android keyloggers which intercepts keyboard events and running in background as services?

2.) Is this possible to identify if any of the background process handelling keyboard events?

3.) Can I stop any other background service (not owned by me) by my application code?

Please help me with suitable links if you have.

Answer 1

I know this question already has an accepted answer but I disagree with the accepted answer!
This can be done in android via the accessibility APIs.
Take a look at the below program :

Type Machine

It uses the accessibility APIs, and correctly stores every key stroke you type in any application which is essentially what a key logger does!
EDIT : I am not exactly sure what TypeMachine uses but you should be able to get the text from accessibility service using this method. For Example, the following code can be used to get a new text:

void onViewTextChanged(AccessibilityEvent accessibilityEvent, AccessibilityNodeInfo accessibilityNodeInfo) {
     List text = accessibilityEvent.getText();
     CharSequence latestText = (CharSequence) text.get(0);
     Log.i(MY_TAG, latestText.toString());
}