非常新手在入門，做的是安卓TV，想判斷按了遙控器的確認鍵。但是發(fā)現(xiàn)，其他鍵都能進入onKeyDown事件，唯獨是確認鍵不會進入onKeyDown事件，如果確實沒辦法，只能在dispatchKeyEvent攔截了。

 override fun dispatchKeyEvent(event: KeyEvent): Boolean {
        Log.d("dispatchKeyEvent", "dispatchKeyEvent(), action=" + event.action + " keycode=" + event.keyCode)
        return super.dispatchKeyEvent(event)
    }

    override fun onKeyDown(keyCode: Int, event: KeyEvent?): Boolean {
        when (keyCode) {
            KeyEvent.KEYCODE_DPAD_CENTER ->
                Toast.makeText(this, "你按下中間鍵", Toast.LENGTH_SHORT).show()

            KeyEvent.KEYCODE_DPAD_DOWN ->
                Toast.makeText(this, "你按下下間鍵", Toast.LENGTH_SHORT).show()

            KeyEvent.KEYCODE_DPAD_LEFT ->
                Toast.makeText(this, "你按下左方向鍵", Toast.LENGTH_SHORT).show()

            KeyEvent.KEYCODE_DPAD_RIGHT ->
                Toast.makeText(this, "你按下右方向鍵", Toast.LENGTH_SHORT).show()

            KeyEvent.KEYCODE_DPAD_UP ->
                Toast.makeText(this, "你按下上方向鍵", Toast.LENGTH_SHORT).show()

            KeyEvent.KEYCODE_BACK ->
                Toast.makeText(this, "你按下后退鍵", Toast.LENGTH_SHORT).show()
        }
        return super.onKeyDown(keyCode, event)
    }