Android开发 Fragment里监听返回键

方式一

override fun onResume() {
    super.onResume()
    view?.isFocusableInTouchMode = true
    view?.requestFocus()
    view?.setOnKeyListener(View.OnKeyListener { view, i, keyEvent ->
        if (keyEvent.action == KeyEvent.ACTION_DOWN && i == KeyEvent.KEYCODE_BACK) {
            Toast.makeText(context, "当前设备绑定中，请不要退出", Toast.LENGTH_SHORT).show()
            return@OnKeyListener true
        }
        false
    })
}

end