使用导航组件删除后台堆栈中的片段

Question

我的应用正在使用导航组件。在这种情况下，我有四个片段加载顺序是 A->B->C->D。在片段 D 中，当我全部完成后，我想直接返回片段 A，同时删除片段 B、C、D。有人对此案有解决方案吗？感谢您的回复！

Answer 1

您可以通过检查解决文档中的目标情况。

With each navigation action, a destination is added to the back stack. If you were to navigate repeatedly through this flow, your back stack would then contain multiple sets of each destination (A, B, C, A, B, C, A, and so on). To avoid this repetition, you can specify app:popUpTo and app:popUpToInclusive in the action that takes you from destination C to destination A, as shown in the following example:

<fragment
android:id="@+id/c"
android:name="com.example.myapplication.C"
android:label="fragment_c"
tools:layout="@layout/fragment_c">

<action
    android:id="@+id/action_c_to_a"
    app:destination="@id/a"
    app:popUpTo="@+id/a"
    app:popUpToInclusive="true"/>

After reaching destination C, the back stack contains one instance of each destination (A, B, C). When navigating back to destination A, we also popUpTo A, which means that we remove B and C from the stack while navigating. With app:popUpToInclusive="true", we also pop that first A off of the stack, effectively clearing it. Notice here that if you don't use app:popUpToInclusive, your back stack would contain two instances of destination A.

使用导航组件删除后台堆栈中的片段

Remove fragment in backstack with navigation component

navigation

android

fragment