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 android 中，在移动到新片段后，我一直在清除导航堆栈.

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，我希望在导航到 home 片段时从堆栈中清除此片段，以便用户在按下后退按钮时不会返回到 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.

我正在使用一个简单的 NavHostFragment.findNavController(Fragment).navigate(R.id.homeFragment) 进行导航.

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());
                    }
                }
            });

我尝试使用 NavOptions 在 navigate()，但后退按钮仍然让我回到 loginFragment

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，添加属性 app:popUpTo='your_nav_graph_id' 和 app:popUpToInclusive="true"到操作标签.

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，导航到目的地，使用上述动作作为参数.

Second, navigate to the destination, using above action as parameter.

findNavController(fragment).navigate(
     SignInFragmentDirections.actionSignInFragmentToUserNameFragment())

有关详细信息，请参阅文档.

See the docs for more information.

注意:如果您使用方法 navigate(@IdRes int resId) 进行导航，您将不会得到想要的结果.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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