Android 带有DroidX的Camera.Parameters.Flatte（）上的StringIndexOutOfBoundsException

最近，当我调用Camera.Parameters.flatte时，我从用户那里收到了一些非常奇怪的错误报告，显示了StringIndexOutOfBoundsException

我想我使用的params对象可能是空的，在调用flatte之前我不会检查它，但我希望是NPE

还有人见过类似的东西吗？我还没有收到用户的反馈，无论是一次还是每次，我开始怀疑这在运行2.2的DroidX中有多普遍

EXTRA INFO:
Error setting cam params. Current op was:
Setting camera orientation
Op trace: Starting op: Setting camera orientation

App Version: Version 1.02 - build 31
------------------------------------------------
DEVICE INFO:
Device: cdma_shadow
Manufacturer: motorola
Model: DROIDX
OS Version release: 2.2
------------------------------------------------
STACK TRACE
mobi.sense8.android.util.camera.CameraHelperException
at java.lang.AbstractStringBuilder.deleteCharAt0(AbstractStringBuilder.java:257)
at java.lang.StringBuilder.deleteCharAt(StringBuilder.java:360)
at android.hardware.Camera$Parameters.flatten(Camera.java:945)
at mobi.sense8.android.util.camera.CameraHelper.setOrientation(CameraHelper.java:120)
at mobi.sense8.android.iSnipeYou.iSnipeYou.initCameraNew(iSnipeYou.java:650)
at mobi.sense8.android.iSnipeYou.iSnipeYou.surfaceChanged(iSnipeYou.java:630)
at android.view.SurfaceView.updateWindow(SurfaceView.java:538)
at android.view.SurfaceView.onWindowVisibilityChanged(SurfaceView.java:206)
at android.view.View.dispatchWindowVisibilityChanged(View.java:3891)
at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:719)
at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:719)
at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:719)
at android.view.ViewRoot.performTraversals(ViewRoot.java:753)
at android.view.ViewRoot.handleMessage(ViewRoot.java:1736)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:143)
at android.app.ActivityThread.main(ActivityThread.java:4701)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: -1
... 22 more

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我在2.3.3版本的NexusOne上也看到了这个错误。在我的例子中，在调用flatte之前，对象不是NULL，但我还没有找到导致问题的参数。