Error inflating class fragment 报错

报错内容：

E/AndroidRuntime: FATAL EXCEPTION: mainProcess: com.example.testproject, PID: 7076java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.testproject/com.example.testproject.MainActivity}: android.view.InflateException: Binary XML file line #9 in com.example.testproject:layout/activity_main: Binary XML file line #9 in com.example.testproject:layout/activity_main: Error inflating class fragmentat android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3685)at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3842)at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:103)at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2252)at android.os.Handler.dispatchMessage(Handler.java:106)at android.os.Looper.loopOnce(Looper.java:201)at android.os.Looper.loop(Looper.java:288)at android.app.ActivityThread.main(ActivityThread.java:7842)at java.lang.reflect.Method.invoke(Native Method)at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)Caused by: android.view.InflateException: Binary XML file line #9 in com.example.testproject:layout/activity_main: Binary XML file line #9 in com.example.testproject:layout/activity_main: Error inflating class fragmentCaused by: android.view.InflateException: Binary XML file line #9 in com.example.testproject:layout/activity_main: Error inflating class fragmentCaused by: java.lang.IllegalArgumentException: Binary XML file line #9: Must specify unique android:id, android:tag, or have a parent with an id for androidx.navigation.fragment.NavHostFragmentat androidx.fragment.app.FragmentLayoutInflaterFactory.onCreateView(FragmentLayoutInflaterFactory.java:76)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 android.view.LayoutInflater.inflate(LayoutInflater.java:485)at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:699)at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:195)at com.example.testproject.MainActivity.onCreate(MainActivity.kt:9)at android.app.Activity.performCreate(Activity.java:8054)at android.app.Activity.performCreate(Activity.java:8034)at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1341)at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3666)at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3842)at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:103)at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2252)at android.os.Handler.dispatchMessage(Handler.java:106)at android.os.Looper.loopOnce(Looper.java:201)at android.os.Looper.loop(Looper.java:288)at android.app.ActivityThread.main(ActivityThread.java:7842)
E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Native Method)at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)

经过查资料，有说引入路径不对，包名不对的；

我的包为 androidx.fragment.app.Fragment;

如果调用Fragment的Activity继承的父类不要再使用Activity，即

public class XXXActivity extends Activity

要修改为以下：
1）public class XXXActivity extends FragmentActivity
2）public class XXXActivity extends AppCompatActivity
这样修改，再运行程序就OK了。

为啥两个都可以呢？其实
public class AppCompatActivity extends FragmentActivity

经检查我的继承是正确的

class MainActivity : AppCompatActivity() {

最终原因：未给 <fragment/> 赋值 ID

错以为fragment可以像一些文字、按钮组件一样不用id也可以，实际不可以；

参考博客：

Error inflating class fragment解决方案_CrazyPotatooo的博客-CSDN博客

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Error inflating class fragment 报错

经检查我的继承是正确的

最终原因：未给 <fragment/> 赋值 ID

参考博客：

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