我是Android新手,尝试使用EventBus将消息从Fragment发送到其容器Activity。 不过,我得到错误:Kotlin不能正常工作的EventBus
D/EventBus: No subscribers registered for event class com.app.todo.controllers.task.TaskListFragment$TaskCreateSelectEvent
以下是有关EventBus活动类的代码:
public class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
}
@Subscribe(threadMode = ThreadMode.MAIN)
fun onTaskCreateSelectEvent(event: TaskListFragment.TaskCreateSelectEvent) {
Log.d("TAG", "On Main Activity")
}
fun addFragment(fragment: Fragment) {
val transaction = supportFragmentManager.beginTransaction()
transaction.setCustomAnimations(R.anim.enter, R.anim.exit, R.anim.pop_enter, R.anim.pop_exit)
transaction.add(R.id.task_fragment_container, fragment)
transaction.addToBackStack(fragment.javaClass.simpleName)
transaction.commit()
}
public override fun onStart() {
super.onStart()
EventBus.getDefault().register(this)
}
public override fun onStop() {
super.onStop()
EventBus.getDefault().unregister(this)
}
}
以下是在片段类
public class TaskListFragment : Fragment() {
private var fab: FloatingActionButton? = null
public class TaskCreateSelectEvent {
var fab: FloatingActionButton? = null
}
override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?, savedInstanceState: Bundle?): View? {
var view = inflater!!.inflate(R.layout.task_list_fragment, container, false)
fab = view.findViewById<FloatingActionButton>(R.id.fab)
fab!!.setOnClickListener {
val selectEvent = TaskCreateSelectEvent()
EventBus.getDefault().post(selectEvent)
}
return view
}
}
这是库如何添加在build.gradle
文件中。
apply plugin: 'kotlin-kapt'
dependencies {
compile 'org.greenrobot:eventbus:3.0.0'
kapt 'org.greenrobot:eventbus-annotation-processor:3.0.1' }
kapt {
arguments {
arg('eventBusIndex', 'com.app.todo.controllers.MyEventBusIndex')
}
}
任何想法我做错了什么?
你在哪里调用'addFragment'方法? – Raghunandan
'''addFragment'''尚未被调用。我曾打算调用它来添加更多片段。但目前,坚持要获得活动。 – Khawar
我只是想澄清,如果任务列表片段是附加到活动。你的代码似乎很好,并尝试它自己工作 – Raghunandan