我有一个带有RecyclerView播客的屏幕，单击该按钮时，它将带您到该特定播客的详细屏幕。使用Kodein进行ViewModel注入，如何将从列表片段中单击的播客的ID传递到详细信息片段的ViewModel，以便可以从API中获取它？
详细的ViewModel结构如下：
class PodcastDetailViewModel internal constructor(
private val podcastRepository: PodcastRepository,
podcastId: String = ""
): ViewModel() {
// viewmodel stuff
}
详细片段如下：
class PodcastDetailFragment : ScopedFragment(), KodeinAware {
override val kodein by closestKodein()
private val args: PodcastDetailFragmentArgs by navArgs()
private val viewModelFactory: PodcastDetailViewModelFactory by kodein.newInstance { PodcastDetailViewModelFactory(args.podcastId, instance()) }
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
viewModel = viewModelFactory.create(PodcastDetailViewModel::class.java)
}
// other stuff
}
这是我从列表导航到详细信息屏幕的方式：
private fun navigateToPodcastDetailFragment(podcastId: String) {
val args = Bundle()
args.putString("podcast_id", podcastId)
val directions =
TopPodcastsFragmentDirections.viewPodcastDetails(
podcastId
)
val extras = FragmentNavigatorExtras(
podcast_image to "podcastImage_$podcastId"
)
Navigation.findNavController(requireActivity(), R.id.nav_host_fragment)
.navigate(directions, extras)
}
这是我的绑定方式：
bind() from provider { PodcastDetailViewModelFactory(instance(), instance()) }
我不确定如何在ViewModelFactory构造函数中绑定该字符串参数，或者如何将数据传递到那里，因此我们将不胜感激。
答案 0 :(得分：2)
您可以使用工厂进行绑定：
bind() from factory { podcastId: String ->
PodcastDetailViewModelFactory(podcastId, instance())
}
通过以下方式现场调用：
private val viewModelFactory: PodcastDetailViewModelFactory by instance(arg = args.podcastId)
希望这会有所帮助。
答案 1 :(得分：0)
我通过切换到工厂绑定来解决此问题，就像romainbsl建议的那样，但是片段中的调用有些不同。
绑定变为：
bind() from factory { podcastId: String ->
PodcastDetailViewModelFactory(podcastId, instance())
}
，现场电话变为：
private val viewModelFactory: PodcastDetailViewModelFactory by instance(arg = args.podcastId)
答案 2 :(得分：0)
试试这个
Unable to load msg [custom_msg_python/SensorInformation]: Cannot locate message [SensorInformation]: unknown package [custom_msg_python] on search path
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],
"roslaunch":[
"/opt/ros/melodic/share/roslaunch/msg"
],
"tf2_eigen":[
"/opt/ros/melodic/share/tf2_eigen/msg"
],
"rqt_tf_tree":[
"/opt/ros/melodic/share/rqt_tf_tree/msg"
],
"gazebo_ros_control":[
"/opt/ros/melodic/share/gazebo_ros_control/msg"
],
"moveit_ros_perception":[
"/opt/ros/melodic/share/moveit_ros_perception/msg"
],
"controller_manager":[
"/opt/ros/melodic/share/controller_manager/msg"
],
"rqt_logger_level":[
"/opt/ros/melodic/share/rqt_logger_level/msg"
],
"kdl_parser":[
"/opt/ros/melodic/share/kdl_parser/msg"
],
"gennodejs":[
"/opt/ros/melodic/share/gennodejs/msg"
],
"media_export":[
"/opt/ros/melodic/share/media_export/msg"
],
"geometry_msgs":[
"/opt/ros/melodic/share/geometry_msgs/msg"
],
"urdf_parser_plugin":[
"/opt/ros/melodic/share/urdf_parser_plugin/msg"
],
"joint_limits_interface":[
"/opt/ros/melodic/share/joint_limits_interface/msg"
],
"sensor_msgs":[
"/opt/ros/melodic/share/sensor_msgs/msg"
],
"orocos_kdl":[
"/opt/ros/melodic/share/orocos_kdl/msg"
],
"rosbag":[
"/opt/ros/melodic/share/rosbag/msg"
],
"rosbag_migration_rule":[
"/opt/ros/melodic/share/rosbag_migration_rule/msg"
]
}
]
或
private val viewModel by viewModels<PodcastDetailViewModel> {
val viewModelFactory: PodcastDetailViewModelFactory by instance(arg = args.podcastId)
viewModelFactory
}