Android Studio应用反复闪退 提示未设置NavController

上次打开项目时应用可正常运行，确认未手动修改任何代码的前提下，当前应用启动即持续闪退，无法正常打开，崩溃日志如下：

2022-06-07 21:06:18.942 7244-7244/com.example.labactivity01layoutsandactivity E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.labactivity01layoutsandactivity, PID: 7244
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.labactivity01layoutsandactivity/com.example.labactivity01layoutsandactivity.MainActivity}: java.lang.IllegalStateException: Activity com.example.labactivity01layoutsandactivity.MainActivity@661d5fe does not have a NavController set on 2131231012
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)
    at android.app.ActivityThread.-wrap12(ActivityThread.java)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:154)
    at android.app.ActivityThread.main(ActivityThread.java:6077)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)
 Caused by: java.lang.IllegalStateException: Activity com.example.labactivity01layoutsandactivity.MainActivity@661d5fe does not have a NavController set on 2131231012
    at androidx.navigation.Navigation.findNavController(Navigation.java:61)
    at androidx.navigation.ActivityKt.findNavController(Activity.kt:30)
    at com.example.labactivity01layoutsandactivity.MainActivity.onCreate(MainActivity.kt:26)
    at android.app.Activity.performCreate(Activity.java:6662)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2599)

核心报错是MainActivity 没有在ID为2131231012的视图上绑定NavController，触发点在MainActivity.kt第26行的onCreate方法里，属于Jetpack Navigation组件的关联异常。既然确认没改代码，90%以上是Android Studio增量编译缓存错乱、资源ID映射失效导致的，剩下10%是意外的布局文件改动、代码执行顺序问题。

按以下顺序排查，基本都能解决：

• 先做最省事的缓存清理：在Android Studio顶部菜单栏依次点Build -> Clean Project，执行完成后再点Build -> Rebuild Project，重新编译运行，大部分无代码改动的突发崩溃都是增量编译的锅，这步就能解决
• 如果清理重编没用，先检查MainActivity的onCreate方法代码顺序：必须先调用setContentView()加载完布局文件，再执行findNavController()相关逻辑，不能在布局加载完成前就获取NavController
• 接着检查布局文件里的导航宿主配置：报错里的ID 2131231012对应的是你放NavHostFragment的容器，确认这个控件没有被误删、ID没有写错，且NavHostFragment已经通过app:navGraph属性正确关联了你的导航图xml文件
• 以上操作都无效的话，直接关闭Android Studio，删除项目根目录下的.gradle文件夹和app模块下的build文件夹，重启IDE重新同步Gradle后再编译即可

内容的提问来源于stack exchange，提问作者Nihilopis R.R