当手机中有其它应用占用camera时，在open时会导致崩溃

[dragonxiang]

java.lang.RuntimeException: Fail to connect to camera service at android.hardware.Camera.native_setup(Native Method) at android.hardware.Camera.(Camera.java:362) at android.hardware.Camera.open(Camera.java:320) at com.qingmei2.library.zxing.OpenCameraInterface.open(OpenCameraInterface.java) at com.qingmei2.library.zxing.CameraManager.openDriver(CameraManager.java) at com.qingmei2.library.view.QRCodeScannerView.surfaceCreated(QRCodeScannerView.java) at android.view.SurfaceView.updateWindow(SurfaceView.java:593) at android.view.SurfaceView.access$000(SurfaceView.java:93) at android.view.SurfaceView$4.setFormat(SurfaceView.java:777) at com.qingmei2.library.view.QRCodeScannerView.surfaceCreated(QRCodeScannerView.java) at android.view.SurfaceView.updateWindow(SurfaceView.java:593) at android.view.SurfaceView.access$000(SurfaceView.java:93) at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:184) at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:847) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1951) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1053) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5959) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:780) at android.view.Choreographer.doCallbacks(Choreographer.java:593) at android.view.Choreographer.doFrame(Choreographer.java:562) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:766) at android.os.Handler.handleCallback(Handler.java:733) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:136) at android.app.ActivityThread.main(ActivityThread.java:5356) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:515) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:864) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:680) at dalvik.system.NativeStart.main(Native Method)

建议在open前做一下camera的释放，如下： try{ camera.stopPreview(); camera.release(); camera = null; }catch (Exception e){ return; }