AndroidStudio：膨胀类片段时出错(加载活动\主ui时程序崩溃)

j13ufse2  于 2021-09-13  发布在  Java
关注(0)|答案(0)|浏览(351)

我是一个初学者，在一个小项目中使用android studio。我已经查过这个问题，但我在解决这个问题上遇到了困难。下面是日志和代码。
问题似乎与主窗体上的ui有关，我只是在尝试对某些对象或“图像”设置约束以防止它们在程序运行时四处移动后才遇到问题。
守则：

  1. <?xml version="1.0" encoding="utf-8"?>
  2. <androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
  3.     xmlns:app="http://schemas.android.com/apk/res-auto"
  4.     xmlns:tools="http://schemas.android.com/tools"
  5.     android:layout_width="match_parent"
  6.     android:layout_height="match_parent"
  7.     tools:context=".MainActivity">
  9.     <com.google.android.material.appbar.AppBarLayout
  10.         android:layout_width="match_parent"
  11.         android:layout_height="wrap_content"
  12.         android:theme="@style/Theme.IAdmin.AppBarOverlay">
  14.         <androidx.appcompat.widget.Toolbar
  15.             android:id="@+id/toolbar"
  16.             android:layout_width="match_parent"
  17.             android:layout_height="?attr/actionBarSize"
  18.             android:background="?attr/colorPrimary"
  19.             app:popupTheme="@style/Theme.IAdmin.PopupOverlay" />
  21.     </com.google.android.material.appbar.AppBarLayout>
  23.     <include layout="@layout/content_main" />
  25.     <com.google.android.material.floatingactionbutton.FloatingActionButton
  26.         android:id="@+id/fab"
  27.         android:layout_width="wrap_content"
  28.         android:layout_height="wrap_content"
  29.         android:layout_gravity="bottom|end"
  30.         android:layout_margin="@dimen/fab_margin"
  31.         app:srcCompat="@android:drawable/ic_dialog_email" />
  33. </androidx.coordinatorlayout.widget.CoordinatorLayout>

以及日志（仅包括出错的地方）：

  1. E/AndroidRuntime: FATAL EXCEPTION: main
  2.     Process: com.example.iadmin, PID: 10646
  3.     java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.iadmin/com.example.iadmin.MainActivity}: android.view.InflateException: Binary XML file line #23 in com.example.iadmin:layout/activity_main: Binary XML file line #18 in com.example.iadmin:layout/content_main: Error inflating class fragment
  4.         at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3449)
  5.         at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3601)
  6.         at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)
  7.         at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
  8.         at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
  9.         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066)
  10.         at android.os.Handler.dispatchMessage(Handler.java:106)
  11.         at android.os.Looper.loop(Looper.java:223)
  12.         at android.app.ActivityThread.main(ActivityThread.java:7656)
  13.         at java.lang.reflect.Method.invoke(Native Method)
  14.         at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
  15.         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
  16.      Caused by: android.view.InflateException: Binary XML file line #23 in com.example.iadmin:layout/activity_main: Binary XML file line #18 in com.example.iadmin:layout/content_main: Error inflating class fragment
  17.      Caused by: android.view.InflateException: Binary XML file line #18 in com.example.iadmin:layout/content_main: Error inflating class fragment
  18.      Caused by: java.lang.NullPointerException: Missing required view with ID: com.example.iadmin:id/wrap_content
  19.         at com.example.iadmin.databinding.FragmentFirstBinding.bind(FragmentFirstBinding.java:132)
  20.         at com.example.iadmin.databinding.FragmentFirstBinding.inflate(FragmentFirstBinding.java:77)
  21.         at com.example.iadmin.FirstFragment.onCreateView(FirstFragment.java:24)
  22.         at androidx.fragment.app.Fragment.performCreateView(Fragment.java:2963)
  23.         at androidx.fragment.app.FragmentStateManager.createView(FragmentStateManager.java:518)
  24.         at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:282)
  25.         at androidx.fragment.app.FragmentStore.moveToExpectedState(FragmentStore.java:112)
  26.         at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1647)
  27.         at androidx.fragment.app.FragmentManager.dispatchStateChange(FragmentManager.java:3128)
  28.         at androidx.fragment.app.FragmentManager.dispatchViewCreated(FragmentManager.java:3065)
  29.         at androidx.fragment.app.Fragment.performViewCreated(Fragment.java:2988)
  30.         at androidx.fragment.app.FragmentStateManager.ensureInflatedView(FragmentStateManager.java:392)
  31.         at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:281)
  32.         at androidx.fragment.app.FragmentLayoutInflaterFactory.onCreateView(FragmentLayoutInflaterFactory.java:140)
  33.         at androidx.fragment.app.FragmentController.onCreateView(FragmentController.java:135)
  34.         at androidx.fragment.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:319)
  35.         at androidx.fragment.app.FragmentActivity.onCreateView(FragmentActivity.java:298)
  36.         at android.view.LayoutInflater.tryCreateView(LayoutInflater.java:1067)
  37.         at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:995)
  38.         at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:959)
  39.         at android.view.LayoutInflater.rInflate(LayoutInflater.java:1121)
  40.         at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1082)
  41.         at android.view.LayoutInflater.parseInclude(LayoutInflater.java:1261)
  42.         at android.view.LayoutInflater.rInflate(LayoutInflater.java:1117)
  43.         at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1082)
  44.         at android.view.LayoutInflater.inflate(LayoutInflater.java:680)
  45.         at android.view.LayoutInflater.inflate(LayoutInflater.java:532)
  46.         at com.example.iadmin.databinding.ActivityMainBinding.inflate(ActivityMainBinding.java:49)
  47.         at com.example.iadmin.databinding.ActivityMainBinding.inflate(ActivityMainBinding.java:43)
  48.         at com.example.iadmin.MainActivity.onCreate(MainActivity.java:30)
  49.         at android.app.Activity.performCreate(Activity.java:8000)
  50.         at android.app.Activity.performCreate(Activity.java:7984)
  51.         at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1309)
  52.         at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3422)
  53.         at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3601)
  54.         at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)
  55.         at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
  56.         at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
  57.         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066)
  58.         at android.os.Handler.dispatchMessage(Handler.java:106)
  59.         at android.os.Looper.loop(Looper.java:223)
  60.         at android.app.ActivityThread.main(ActivityThread.java:7656)
  61.         at java.lang.reflect.Method.invoke(Native Method)
  62.         at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
  63.         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
  64. W/System: A resource failed to call close.

感谢您的帮助。

Javaandroiduser-interfaceandroid-layout

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