重复的 id，标签为 null，另一个片段用于 androidx.navigation.fragment.NavHostFragment

Question

问题 我试图在活动中添加一个片段以及导航。但我看到以下错误

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.app.myapp/com.app.myapp.HomeMainActivity}: android.view.InflateException: Binary XML file line #12: Binary XML file line #12: Error inflating class fragment
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2927)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2988)
    at android.app.ActivityThread.-wrap14(ActivityThread.java)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1631)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:154)
    at android.app.ActivityThread.main(ActivityThread.java:6682)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410)
 Caused by: android.view.InflateException: Binary XML file line #12: Binary XML file line #12: Error inflating class fragment
 Caused by: android.view.InflateException: Binary XML file line #12: Error inflating class fragment
 Caused by: java.lang.IllegalArgumentException: Binary XML file line #12: Duplicate id 0x7f0900ed, tag null, or parent id 0xffffffff with another fragment for androidx.navigation.fragment.NavHostFragment

代码

1. activity_home_new.xml

       <?xml version="1.0" encoding="utf-8"?>
      <layout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
         xmlns:tools="http://schemas.android.com/tools">
         <androidx.constraintlayout.widget.ConstraintLayout
           android:layout_width="match_parent"
           android:layout_height="match_parent"
           android:background="@color/colorPrimaryDark"
           tools:context=".HomeMainActivity">
   
           <fragment
           android:id="@+id/my_nav_host_fragment"
           android:name="androidx.navigation.fragment.NavHostFragment"
           android:layout_width="0dp"
           android:layout_height="0dp"
           app:defaultNavHost="true"
           app:layout_constraintBottom_toBottomOf="parent"
           app:layout_constraintEnd_toEndOf="parent"
           app:layout_constraintStart_toStartOf="parent"
           app:layout_constraintTop_toTopOf="parent"
           app:navGraph="@navigation/nav_graph" />
          </androidx.constraintlayout.widget.ConstraintLayout>
   
          </layout>
   

Fragment 和 Activity 类没有变化。

我试过的解决方案

我尝试在 ctivity_home_new.xml 中将片段更改为 framelayout 和 FragmentContainerView 该应用程序没有；碰撞。

我对车祸的看法

崩溃与“androidx.navigation.fragment.NavHostFragment”有关。与 MapFragment 相关的类似问题很少。

不找代码，只想知道崩溃的根本原因

Answer 1

看来NavHostFragment只是一个巧合的passwalker。此问题与两次膨胀 XML 内容有关。

就我而言，我在做什么：

override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        binding = ActivitySigninBinding.inflate(layoutInflater)
        setContentView(R.layout.activity_signin)
}

它一直在工作，直到我将我的内容分成更多片段。修复是：

 override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        binding = ActivitySigninBinding.inflate(layoutInflater)
        setContentView(binding.root) // Notice the binding root
}

希望能帮到你，花点时间弄明白。