Fragment NavHostFragment 没有创建视图 [英] Fragment NavHostFragment did not create a view

问题描述

我个人无法发现这个问题，但 Firebase Crashlytics 上有很多这样的错误

I couldn’t catch this problem personally, but there are a lot of such errors on Firebase Crashlytics

我用 StackOverflow 尝试了所有答案，但没有任何帮助

I tried all the answers with StackOverflow but nothing helped

我的 R.layout.activity_main

My R.layout.activity_main

<fragment
    android:id="@+id/nav_host_fragment"
    android:name="androidx.navigation.fragment.NavHostFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:defaultNavHost="true"
    app:navGraph="@navigation/main_graph"/>

我的导航/main_graph

My navigation/main_graph

<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tols"
    xmlns:tools2="http://schemas.android.com/tools"
    android:id="@+id/main_graph"
    app:startDestination="@id/ordersFragment">

    <fragment
        android:id="@+id/ordersFragment"
        android:name="com.app.package.ui.orders.view.OrdersFragment"
        android:label="@string/menu_orders"
        tools:layout="@layout/fragment_orders">
    <action
        android:id="@+id/action_ordersFragment_to_orderFragment"
        app:destination="@id/orderFragment" />
    <action
        android:id="@+id/action_ordersFragment_to_problemFragment"
        app:destination="@id/problemFragment" />
    <action
        android:id="@+id/action_ordersFragment_to_settingsFragment"
        app:destination="@id/settingsFragment" />
    </fragment>

    <fragment
        android:id="@+id/problemFragment"
        android:name="com.app.package.ui.problem.ProblemFragment"
        android:label="@string/menu_problems" />

    <fragment
        android:id="@+id/orderFragment"
        android:name="com.app.package.ui.order.view.OrderFragment"
        android:label="OrderFragment">
    <action
        android:id="@+id/action_orderFragment_to_compositionFragment"
        app:destination="@id/compositionFragment" />
    <action
        android:id="@+id/action_orderFragment_to_selectCheckDialog"
        app:destination="@id/selectCheckDialog" />
    </fragment>

    <fragment
        android:id="@+id/compositionFragment"
        android:name="com.app.package.ui.composition.CompositionFragment"
        android:label="fragment_composition"
        tools2:layout="@layout/fragment_composition" />

    <fragment
        android:id="@+id/settingsFragment"
        android:name="com.app.package.ui.settings.SettingsFragment"
        android:label="fragment_settings"
        tools2:layout="@layout/fragment_settings" />

    <fragment
        android:id="@+id/selectCheckDialog"
        android:name="com.app.package.ui.order.view.SelectCheckDialog"
        android:label="dialog_select_check"
        tools2:layout="@layout/dialog_select_check" />
</navigation>

我的毕业证

implementation 'androidx.navigation:navigation-fragment:2.2.0'
implementation 'androidx.navigation:navigation-ui:2.2.0'

我尝试了不同的解决方案，但没有任何帮助.从 Firebase Crashlytics 来看，342 位用户发生了 963 次崩溃.

I tried different solutions but nothing helped. Judging by Firebase Crashlytics 963 crash in 342 users.

推荐答案

在使用应用程序时尝试旋转手机时遇到此问题.

Encountered this when tried to rotate the phone, while using the application.

这发生在我身上，因为我在 onCreate 中使用了 Fragment 事务，即使 nav_graph.xml 为我们处理.

This happened to me because I was using Fragment transactions in onCreate, even though nav_graph.xml handles that for us.

我刚刚改变了:

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.main_activity)
    if (savedInstanceState == null) {
        supportFragmentManager.beginTransaction()
            .replace(R.id.container, MainFragment.newInstance())
            .commitNow()
    }
}

到:

 override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.main_activity)
}

这篇关于Fragment NavHostFragment 没有创建视图的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！