最近的项目中使用了Navigation组件,使用此组件来实现界面跳转栈,分享一个使用时遇到的一个问题
Navigation的流程图:

微信截图_20200426160606.png

从userFragment一直进入到changePasswordNextFragment,当我在栈顶的逻辑做完后,需要回到userFragment时,Navigation组件是有提供了两个弹出栈的方法

findNavController().popBackStack()
findNavController().popBackStack(@IdRes int destinationId, boolean inclusive)

由于此时的需求是要回到userFragment,因此此时需要用的就是带有参数的popBackStack(@IdRes int destinationId, boolean inclusive)
两个参数中,第一个@IdRes int destinationId不难理解,就是要到达的目标fragment的id,也就是在navigation.xml文件中Fragment的id,
第二个参数boolean inclusive是个布尔值,点进去看popBackStack的源码

     * Attempts to pop the controller's back stack back to a specific destination.
     *
     * @param destinationId The topmost destination to retain
     * @param inclusive Whether the given destination should also be popped.
     *
     * @return true if the stack was popped at least once and the user has been navigated to
     * another destination, false otherwise
     */
    public boolean popBackStack(@IdRes int destinationId, boolean inclusive) {
        boolean popped = popBackStackInternal(destinationId, inclusive);
        // Only return true if the pop succeeded and we've dispatched
        // the change to a new destination
        return popped && dispatchOnDestinationChanged();
    }

看源码最头疼的就是翻译了,当时直接对整段注释进行翻译

微信截图_20200426161855.png

java.lang.IllegalArgumentException

navigation destination com.jzit168.conferencelive:id/action_userFragment_to_updateVersionFragment is unknown to this NavController

解析原始
1 androidx.navigation.NavController.navigate(NavController.java:863)
2 androidx.navigation.NavController.navigate(NavController.java:804)
3 androidx.navigation.NavController.navigate(NavController.java:790)
4 androidx.navigation.NavController.navigate(NavController.java:778)
5 com.jzit168.conferencelive.ui.user.view.UserFragment$initListener$4.onClick(UserFragment.kt:36)
6 android.view.View.performClick(View.java:7261)
7 android.view.View.performClickInternal(View.java:7238)
8 android.view.View.access$3500(View.java:815)
9 android.view.View$PerformClick.run(View.java:27531)
10 android.os.Handler.handleCallback(Handler.java:883)
11 android.os.Handler.dispatchMessage(Handler.java:100)
12 android.os.Looper.loop(Looper.java:227)
13 android.app.ActivityThread.main(ActivityThread.java:7550)
14 java.lang.reflect.Method.invoke(Native Method)
15 com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539)
16 com.android.internal.os.ZygoteInit.main(ZygoteInit.java:953)

关键错误is unknown to this NavController
需要进入的Fragment变成未知的,找到错误日志,赶紧百度一波,结果发现搜到的错误日志差不多相似,但是产生的原因不一致,别人的说是连续点击造成的,但我的却并不是这个原因造成的啊,找来找去,找来找去,直到我看到了这样一篇文章中对页面跳转和指定页面跳转参数的解释

微信截图_20200426163121.png