android-studio - 无法解析符号“R”（膨胀类片段时出错）

Question

这导致我无法为片段充气。这是来自无法解析符号“R”的 androidx 库。我尝试过清理、重建甚至无效并重新启动。还要在 gradle 文件中添加这个特定的依赖项，并删除 gradle 缓存文件，让它在重启时重新下载。它永远无法修复

在 GragmentLayoutInflaterFactory.java 时显示的问题

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.wayneyong.poibrowser, PID: 5527
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.wayneyong.poibrowser/com.wayneyong.poibrowser.PoiBrowserActivity}: android.view.InflateException: Binary XML file line #121 in com.wayneyong.poibrowser:layout/activity_poi_browser: Binary XML file line #121 in com.wayneyong.poibrowser:layout/activity_poi_browser: Error inflating class fragment
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3308)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3457)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2044)
        at android.os.Handler.dispatchMessage(Handler.java:107)
        at android.os.Looper.loop(Looper.java:224)
        at android.app.ActivityThread.main(ActivityThread.java:7560)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)
     Caused by: android.view.InflateException: Binary XML file line #121 in com.wayneyong.poibrowser:layout/activity_poi_browser: Binary XML file line #121 in com.wayneyong.poibrowser:layout/activity_poi_browser: Error inflating class fragment
     Caused by: android.view.InflateException: Binary XML file line #121 in com.wayneyong.poibrowser:layout/activity_poi_browser: Error inflating class fragment
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.hardware.Camera$Parameters android.hardware.Camera.getParameters()' on a null object reference
        at com.wayneyong.poibrowser.ar.ArFragmentSupport.createCameraView(ArFragmentSupport.java:139)
        at com.wayneyong.poibrowser.ar.ArFragmentSupport.init(ArFragmentSupport.java:94)
        at com.wayneyong.poibrowser.ar.ArFragmentSupport.onCreateView(ArFragmentSupport.java:182)
        at androidx.fragment.app.Fragment.performCreateView(Fragment.java:2963)
        at androidx.fragment.app.FragmentStateManager.ensureInflatedView(FragmentStateManager.java:386)
        at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:281)
        at androidx.fragment.app.FragmentLayoutInflaterFactory.onCreateView(FragmentLayoutInflaterFactory.java:140)
        at androidx.fragment.app.FragmentController.onCreateView(FragmentController.java:135)
        at androidx.fragment.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:319)
        at androidx.fragment.app.FragmentActivity.onCreateView(FragmentActivity.java:298)
        at android.view.LayoutInflater.tryCreateView(LayoutInflater.java:1073)
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:1001)
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:965)
        at android.view.LayoutInflater.rInflate(LayoutInflater.java:1127)
        at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1088)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:686)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:538)
        at com.wayneyong.poibrowser.databinding.ActivityPoiBrowserBinding.inflate(ActivityPoiBrowserBinding.java:113)
        at com.wayneyong.poibrowser.databinding.ActivityPoiBrowserBinding.inflate(ActivityPoiBrowserBinding.java:107)
        at com.wayneyong.poibrowser.PoiBrowserActivity.onCreate(PoiBrowserActivity.java:122)
        at android.app.Activity.performCreate(Activity.java:7894)
        at android.app.Activity.performCreate(Activity.java:7881)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1307)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3283)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3457)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2044)
        at android.os.Handler.dispatchMessage(Handler.java:107)
        at android.os.Looper.loop(Looper.java:224)
        at android.app.ActivityThread.main(ActivityThread.java:7560)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)
I/Process: Sending signal. PID: 5527 SIG: 9

标签： android-studioandroid-layoutandroid-fragmentsandroidxandroid-studio-4.2