Android TV - Switch to HDMI input programatically

Is there a way to switch to an HDMI input programmatically on Android TV? I.e. a Smart TV, not a separate box.

What I was trying is to send a key event, but nothing happens when I run this:

# `someButton` is a button on the `activity_main.xml`
val inputConnection = BaseInputConnection(someButton.rootView, true);
inputConnection.sendKeyEvent(
    KeyEvent(
        KeyEvent.ACTION_DOWN,
        KeyEvent.KEYCODE_TV_INPUT_HDMI_4,
    )
)
inputConnection.sendKeyEvent(
    KeyEvent(
        KeyEvent.ACTION_UP,
        KeyEvent.KEYCODE_TV_INPUT_HDMI_4,
    )
)

Should this work, but I am doing something wrong? Is there another way to do this?

Running it via adb from my computer works:

adb connect MY_TV
adb shell input keyevent 246

For reference, what I tried so far:

• Found this old post asking the same question, but no answer: Android TV switch HDMI input port programmatically
• Got the idea with sendKeyEvent from here, but as mentioned did not work: How can I send key events in android?
• From the above post, I also unsuccessfully tried the exec("input keycode 246") and instrumentation.sendKeyDownUpSync(...). It did not work, but as I understand it, those need special privileges anyway.