Cannot capture keypressed event in modal on Android

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: 8.2.0
• Cross-platform modules:
• Android Runtime: 6.3.1
• iOS Runtime: N/A
• Plugin(s):
• NativeScript-Angular: 8.2.1
• Angular: 8.2.0

Describe the bug
Same as title, 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.

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 和复现步骤中描述的非全屏模态框开始。跟踪模态框及其下拉菜单打开时 dispatchKeyEvent 和应用通知的行为，然后验证是否可以在模态框中捕获并记录硬件箭头键事件。