求助：play-services-code-scanner突然无法运行问题排查

架构老林

2026-7-9

Google ML Kit 条码扫描突然失效问题排查与解决

对应错误日志

1512-5684 WindowManager system_server E win=Window{6dee8ad u0 com.xxxxx.yyyyy/com.google.mlkit.vision.codescanner.internal.GmsBarcodeScanningDelegateActivity} destroySurfaces: appStopped=true cleanupOnResume=false win.mWindowRemovalAllowed=false win.mRemoveOnExit=false win.mViewVisibility=4 caller=com.android.server.wm.ActivityRecord.destroySurfaces:6535 com.android.server.wm.ActivityRecord.destroySurfaces:6516 com.android.server.wm.ActivityRecord.notifyAppStopped:6580 com.android.server.wm.ActivityRecord.activityStopped:7168 com.android.server.wm.ActivityClientController.activityStopped:258 android.app.IActivityClientController$Stub.onTransact:613 com.android.server.wm.ActivityClientController.onTransact:136

解决方法

修正扫描启动时机：日志中appStopped=true说明启动扫描时宿主Activity处于停止状态，必须在宿主Activity的onStart或onResume阶段调用startScan()，禁止在后台或onStop阶段触发扫描。
升级依赖版本：16.1.0版本存在窗口管理兼容性bug，升级到最新稳定版修复问题：
```
implementation 'com.google.android.gms:play-services-code-scanner:16.2.0'
```

主动校验相机权限：即使之前权限正常，也可能被系统或用户撤销，启动扫描前先检查权限：

val cameraPermission = Manifest.permission.CAMERA
if (ContextCompat.checkSelfPermission(this, cameraPermission) != PackageManager.PERMISSION_GRANTED) {
    ActivityCompat.requestPermissions(this, arrayOf(cameraPermission), 1001)
    return
}
barcodeScanner.startScan()