Android中的Barcodescanner相机自动对焦例外

Question

任何人都可以知道为什么有些设备通过异常当相机通过i跟踪异常时使用条形码扫描器。它最初工作正常，但在尝试自动聚焦两到三次后，我得到一个RuntimeException：autoFocus失败：

Fatal Exception: java.lang.RuntimeException: autoFocus failed
   at android.hardware.Camera.native_autoFocus(Camera.java)
   at android.hardware.Camera.autoFocus(Camera.java:1126)
   at com.maruticourier.android.ZBarScannerActivity$1.run(ZBarScannerActivity.java:175)
   at android.os.Handler.handleCallback(Handler.java:800)
   at android.os.Handler.dispatchMessage(Handler.java:100)
   at android.os.Looper.loop(Looper.java:194)
   at android.app.ActivityThread.main(ActivityThread.java:5391)
   at java.lang.reflect.Method.invokeNative(Method.java)
   at java.lang.reflect.Method.invoke(Method.java:525)
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
   at dalvik.system.NativeStart.main(NativeStart.java)