导航到Android中的另一个片段后如何清除导航堆栈 [英] How to clear navigation Stack after navigating to another fragment in Android
问题描述
我正在使用新的 导航架构组件 ,在进入新片段后,我被困在清除导航堆栈中.
I am using The new Navigation Architecture Component in android and I am stuck in clearing the navigation stack after moving to a new fragment.
示例: 我在loginFragment中,当我导航到home片段时,我希望从堆栈中清除此片段,以便当用户按下后退按钮时,用户不会返回到loginFragment.
Example: I am in the loginFragment and I want this fragment to be cleared from the stack when I navigate to the home fragment so that the user will not be returned back to the loginFragment when he presses the back button.
I am using a simple NavHostFragment.findNavController(Fragment).navigate(R.id.homeFragment) to navigate.
当前代码:
mAuth.signInWithCredential(credential)
.addOnCompleteListener(getActivity(), new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if (task.isSuccessful()) {
NavHostFragment.findNavController(LoginFragment.this).navigate(R.id.homeFragment);
} else {
Log.w(TAG, "signInWithCredential:failure", task.getException());
}
}
});
I tried using the NavOptions in the navigate(), but the back button is still sending me back to the loginFragment
NavOptions.Builder navBuilder = new NavOptions.Builder();
NavOptions navOptions = navBuilder.setPopUpTo(R.id.homeFragment, false).build();
NavHostFragment.findNavController(LoginFragment.this).navigate(R.id.homeFragment, null, navOptions);
推荐答案
首先,将app:popUpTo='your_nav_graph_id'
和app:popUpToInclusive="true"
属性添加到动作标签.
First, add attributes app:popUpTo='your_nav_graph_id'
and app:popUpToInclusive="true"
to the action tag.
<fragment
android:id="@+id/signInFragment"
android:name="com.glee.incog2.android.fragment.SignInFragment"
android:label="fragment_sign_in"
tools:layout="@layout/fragment_sign_in" >
<action
android:id="@+id/action_signInFragment_to_usersFragment"
app:destination="@id/usersFragment"
app:launchSingleTop="true"
app:popUpTo="@+id/main_nav_graph"
app:popUpToInclusive="true" />
</fragment>
第二,使用上述操作作为参数,导航到目的地.
Second, navigate to the destination, using above action as parameter.
findNavController(fragment).navigate(
SignInFragmentDirections.actionSignInFragmentToUserNameFragment())
有关详细信息,请参见文档.
See the docs for more information.
注意:如果使用方法navigate(@IdRes int resId)
导航,则不会获得所需的结果.因此,我使用了方法navigate(@NonNull NavDirections directions)
.
NOTE: If you navigate using method navigate(@IdRes int resId)
, you won't get the desired result. Hence, I used method navigate(@NonNull NavDirections directions)
.
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