Cannot capture keydown event in a modal

Environment
Provide version numbers for the following components (information can be retrieved by running tns info in your project folder or by inspecting the package.json of the project):

• CLI: 14
• Cross-platform modules:
• Android Runtime: 8.2
• iOS Runtime:
• Plugin(s):
• NativeScript-Angular: 13
• Angular: 13.2

Describe the bug
I am unable to capture the keydown event in a modal dialog.

The key press is coming from a hardware keyboard, not the onscreen one.

I can accomplish this in any other component using:

application.on('KEYCODE_DPAD_DOWN', (() => {
	console.log('Keyboard Down Arrow Pressed');
}));

And it works fine.

This is after extending activity.android.ts, and adding:

public dispatchKeyEvent(event) {
    let keyCode = event.getKeyCode();

    switch (keyCode) {
        case android.view.KeyEvent.KEYCODE_DPAD_LEFT:
        case android.view.KeyEvent.KEYCODE_DPAD_UP:
            application.notify({
                eventName: 'KEYCODE_DPAD_UP',
            })
            return true;
        case android.view.KeyEvent.KEYCODE_DPAD_RIGHT:
        case android.view.KeyEvent.KEYCODE_DPAD_DOWN:
            application.notify({
                eventName: 'KEYCODE_DPAD_DOWN',
            })
            return true;
        default:
            return super.dispatchKeyEvent(event);
    }
}

I have tried every manner of capturing the keypress in a modal that I could, none work.

To Reproduce
Extend android activity to capture a keypress, try to capture a keypress in a non-fullscreen modal.

Expected behavior
Should be able to capture the keypress and console log it, similar to how it is in a component.

Sample project

Additional context
In my modal, I have a dropdown. If I open the dropdown and then press the up/down arrow keys, it navigates through the selections, so the buttons work in the modal, I just don't know how to capture and console log them.

Please let me know if additional info is required.

从扩展后的 activity.android.ts dispatchKeyEvent 实现入手，使用包含 dropdown 的非全屏 modal 重现该问题。将 modal 中的按键处理与正常工作的组件情况进行比较，并验证可以捕获和记录箭头键事件，同时不会破坏 dropdown 导航。