BottomSheetDialogFragment单击以打开另一个BottomSheetDialogFragment android

Question

我有一个ChatRoomActivity和一个NavHostFragment。默认片段是ConversatioFragment，它可以打开MessageChoicesFragment，也就是BottomSheetDialogFragment。我们有3个选择，1)复制消息，2)从3)删除消息读取。

如果我单击Read from (在其中我可以看到收件人已经读取了消息)，我希望关闭MessageChoicesFragment并打开MessageReadDialogFragment BottomSheetFragment。

所以我想要的流是

ChatRoomActivity {

ConversationFragment --onClick-- MessageChoicesFragment --onClick-->

MessageReadDialogFragment

}

还有更多细节。navGraph的ChatRoomActivity如下所示

<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/chat_room_nav_menu"
    app:startDestination="@id/conversationFragment">

    <fragment
        android:id="@+id/conversationFragment"
        android:name="com.example.ui.fragments.chatroom.ConversationFragment"
        android:label="conversation_fragment"
        tools:layout="@layout/conversation_fragment" >
        <action
            android:id="@+id/action_conversationFragment_to_messageChoicesFragment"
            app:destination="@id/messageChoicesFragment" />
        <action
            android:id="@+id/action_conversationFragment_to_messageReadDialogFragment"
            app:destination="@id/messageReadDialogFragment" />
    </fragment>
    <dialog
        android:id="@+id/messageReadDialogFragment"
        android:name="com.example.ui.dialogs.chatroom.MessageReadDialogFragment"
        android:label="MessageReadDialogFragment"
        tools:layout="@layout/message_read_panel"/>
    <dialog
        android:id="@+id/messageChoicesFragment"
        android:name="com.example.ui.dialogs.chatroom.MessageChoicesFragment"
        android:label="fragment_message_choices"
        tools:layout="@layout/fragment_message_choices" />
</navigation>

当消息上的用户longPress打开MessageChoicesFragment时

override fun onRowLongClicked() {     
   findNavController().navigate(R.id.action_conversationFragment_to_messageChoicesFragment)
}

MessageChoicesFragment有3个按钮。当我按下"Read“按钮时，我想关闭MessageChoicesFragment并打开MessageReadDialogFragment

binding.readFromLayout.setOnClickListener {     
 findNavController().navigate(R.id.action_conversationFragment_to_messageReadDialogFragment)
 dialog?.dismiss()
}

但是，这不起作用，因为当前目的地无法找到从另一个目的地到“某处”的操作。

java.lang.IllegalArgumentException: Navigation action/destination com.example:id/action_conversationFragment_to_messageReadDialogFragment cannot be found from the current destination Destination(com.example:id/messageChoicesFragment) label=fragment_message_choices

那我该怎么解决呢？

Answer 1

或者您可以使用委托函数。在您的openReadFromBottomSHeet()函数中调用bottomSheetDialogFragment。它将在ConversatioFragment触发您的函数。然后，取消先前的底部页，打开一个选项ReadFrom的新底部。

ConversationFragment{
     
     lateinit var messageChoicesDialogFragmentObj:     MessageChoicesDialogFragment()

     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        messageChoicesDialogFragmentObj.onReadFromClick = {
            messageChoicesDialogFragmentObj.dismiss()
            openReadFrom()
        }
    }

    fun openMessageChoicesFragment(){
        // opens MessageChoicesDialogFragment
        messageChoicesDialogFragmentObj = MessageChoicesDialogFragment()
        messageChoicesDialogFragmentObj.show(childFragmentManager, "")
    }
    fun openReadFrom(){
        // opens ReadFromBottomSheetDialogFragment
    }
}

MessageChoicesDialogFragment{
    
    private val onReadFromClick: () -> Unit,

    fun onReadFromButtonClicked(){
          onReadFromClick.invoke()
    }
}

差不多是这样的。对不起，我不能写所有的代码。这只是为了你的理解。各代表团对此很有帮助。我希望它能帮到你。