我有2个动作
措施1
<action
android:id="@+id/actionBaseFragmentToAskForLocation"
app:destination="@+id/introAskForLocationFragment"
app:enterAnim="@anim/slide_in_right"
app:exitAnim="@anim/slide_out_left"
app:popEnterAnim="@anim/slide_in_left"
app:popExitAnim="@anim/slide_out_right" />
措施2
<action
android:id="@+id/actionIntroAskLocationToLogin"
app:destination="@id/loginFragment"
app:enterAnim="@anim/slide_in_right"
app:exitAnim="@anim/slide_out_left"
app:popEnterAnim="@anim/slide_in_right"
app:popExitAnim="@anim/fade_out"
app:popUpTo="@+id/app_main_navigation" />
我想要的是当第二个动作被触发时我想要清除后台堆栈并且只设置loginFragment以保留在堆栈中.
只有一个问题是当我执行Action2时,’slide_out_right’作为退出动画执行
我知道如果我们从堆栈弹出片段,将触发action1的’popExitAnim’而不是action2的’exitAnim’.
但我想知道如何让片段执行slide_out_left动画以退出并将其弹出堆栈.
最佳答案 由于NavOptions由将抽屉绑定到导航图所使用的便利方法在内部处理,因此这有点难以解决.我最初使用设置菜单和onOptionsItemSelected测试了这个解决方案,但基本的想法也应该在这里工作.
首先,确保您的菜单项ID与导航片段的ID相对应:
<menu xmlns:android="http://schemas.android.com/apk/res/android">
...
<item android:id="@+id/example_id" ... />
</menu>
<navigation xmlns:android="http://schemas.android.com/apk/res/android" ... >
...
<fragment android:id="@+id/example_id" ... />
</navigation>
现在,不要在NavHost活动中使用现成的方法来实现connecting the drawer to your NavController实现NavigationView.OnNavigationItemSelectedListener,并覆盖onNavigationItemSelected方法,如下所示:
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
NavHost navHost = Navigation.findNavController(this, R.id.your_nav_host_fragment);
return NavigationUI.onNavDestinationSelected(item, navHost);
}
这会将选择转发为图表中的导航.将your_nav_host_fragment替换为您在其上设置app的片段ID:defaultNavHost =“true”.
您会注意到,虽然这有效,但它仍然默认为幻灯片动画.这是因为NavigationUI
call internally creates its own NavOptions
具有以下设置:
NavOptions.Builder builder = new NavOptions.Builder()
.setLaunchSingleTop(true)
.setEnterAnim(R.anim.nav_default_enter_anim)
.setExitAnim(R.anim.nav_default_exit_anim)
.setPopEnterAnim(R.anim.nav_default_pop_enter_anim)
.setPopExitAnim(R.anim.nav_default_pop_exit_anim);
不幸的是,该方法尚未将NavOptions.Builder作为参数,但您可以基于Android源代码创建一个实用程序类来模拟该功能:
public class NavigationUIHelper {
public static boolean onNavDestinationSelected(@NonNull MenuItem item,
@NonNull NavController navController,
@NonNull NavOptions.Builder builder) {
if ((item.getOrder() & Menu.CATEGORY_SECONDARY) == 0) {
NavDestination destination = findStartDestination(navController.getGraph());
builder.setPopUpTo(destination.getId(), false);
}
NavOptions options = builder.build();
try {
navController.navigate(item.getItemId(), null, options);
return true;
} catch (IllegalArgumentException e) {
return false;
}
}
// Need to copy this private method as well
private static NavDestination findStartDestination(@NonNull NavGraph graph) {
NavDestination startDestination = graph;
while (startDestination instanceof NavGraph) {
NavGraph parent = (NavGraph) startDestination;
startDestination = parent.findNode(parent.getStartDestination());
}
return startDestination;
}
}
最后,在您的活动中,您现在可以将NavigationUI的调用替换为NavigationUIHelper中实现的调用:
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
NavHost navHost = Navigation.findNavController(this, R.id.your_nav_host_fragment);
NavOptions.Builder builder = new NavOptions.Builder()
.setLaunchSingleTop(true)
.setEnterAnim(R.anim.custom_enter)
.setExitAnim(R.anim.custom_exit)
.setPopEnterAnim(R.anim.custom_pop_enter)
.setPopExitAnim(R.anim.custom_pop_exit);
return NavigationUIHelper.onNavDestinationSelected(item, navHost, builder);
}
这应该允许您根据自己的喜好更改抽屉过渡动画,而无需替换导航组件.