Sometimes I get a NullPointerException and the app crashes

[andreagobetti]

I got this error using this plugin (v 1.3.2) in an Apache Cordova app, running on a Asus ZenFone 2 Laser (ZE500KL) with Android 6.0

java.lang.NullPointerException: at org.cloudsky.cordovaPlugins.ZBarScannerActivity.onConfigurationChanged (ZBarScannerActivity.java:329) at android.app.ActivityThread.performConfigurationChanged (ActivityThread.java:4192) at android.app.ActivityThread.handleActivityConfigurationChanged (ActivityThread.java:4311) at android.app.ActivityThread$H.handleMessage (ActivityThread.java:1477) at android.os.Handler.dispatchMessage (Handler.java:102) at android.os.Looper.loop (Looper.java:148) at android.app.ActivityThread.main (ActivityThread.java:5451) at java.lang.reflect.Method.invoke (Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:616)

[andreagobetti]

I checked the file ZBarScannerActivity.java at line 329, which contains this code: camera.setDisplayOrientation(rotation);
so I think this issue is related with #95

[andreagobetti]

Today I've registered a new, more detailed, crash:

Exception java.lang.NullPointerException: Attempt to invoke virtual method 'void android.hardware.Camera.setDisplayOrientation(int)' on a null object reference
org.cloudsky.cordovaPlugins.ZBarScannerActivity.setCameraDisplayOrientation (ZBarScannerActivity.java:247) org.cloudsky.cordovaPlugins.ZBarScannerActivity.tryStartPreview (ZBarScannerActivity.java:525) org.cloudsky.cordovaPlugins.ZBarScannerActivity.surfaceChanged (ZBarScannerActivity.java:301) android.view.SurfaceView.updateWindow (SurfaceView.java:608) android.view.SurfaceView.setFrame (SurfaceView.java:315) android.view.View.layout (View.java:16648) android.widget.FrameLayout.layoutChildren (FrameLayout.java:336) android.widget.FrameLayout.onLayout (FrameLayout.java:273) android.view.View.layout (View.java:16652) android.view.ViewGroup.layout (ViewGroup.java:5438) android.widget.FrameLayout.layoutChildren (FrameLayout.java:336) android.widget.FrameLayout.onLayout (FrameLayout.java:273) android.view.View.layout (View.java:16652) android.view.ViewGroup.layout (ViewGroup.java:5438) android.widget.LinearLayout.setChildFrame (LinearLayout.java:1743) android.widget.LinearLayout.layoutVertical (LinearLayout.java:1586) android.widget.LinearLayout.onLayout (LinearLayout.java:1495) android.view.View.layout (View.java:16652) android.view.ViewGroup.layout (ViewGroup.java:5438) android.widget.FrameLayout.layoutChildren (FrameLayout.java:336) android.widget.FrameLayout.onLayout (FrameLayout.java:273) com.android.internal.policy.PhoneWindow$DecorView.onLayout (PhoneWindow.java:2678) android.view.View.layout (View.java:16652) android.view.ViewGroup.layout (ViewGroup.java:5438) android.view.ViewRootImpl.performLayout (ViewRootImpl.java:2176) android.view.ViewRootImpl.performTraversals (ViewRootImpl.java:1936) android.view.ViewRootImpl.doTraversal (ViewRootImpl.java:1112) android.view.ViewRootImpl$TraversalRunnable.run (ViewRootImpl.java:6035) android.view.Choreographer$CallbackRecord.run (Choreographer.java:858) android.view.Choreographer.doCallbacks (Choreographer.java:670) android.view.Choreographer.doFrame (Choreographer.java:606) android.view.Choreographer$FrameDisplayEventReceiver.run (Choreographer.java:844) android.os.Handler.handleCallback (Handler.java:739) android.os.Handler.dispatchMessage (Handler.java:95) android.os.Looper.loop (Looper.java:148) android.app.ActivityThread.main (ActivityThread.java:5451) java.lang.reflect.Method.invoke (Method.java) com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:726) com.android.internal.os.ZygoteInit.main (ZygoteInit.java:616)

Free VM: 3.74MB
Total VM: 21.79MB
Max VM: 128MB
Battery level: 92%
Charge state: Non in charge
Connection state: Wwan

Device Model: ASUS_Z00ED
Motherboard: Msm8916
Android API: 23
Android OS: 6.0.1
RAM: 1.85GB
Device orientation: Landscape

[phongphan]

I have encountered this. Sometimes surfaceChanged is called before onResume.
This happened after onPause is called (the camera has been released), hence NPE

The #125 should address this. The camera will resume only when onResume is called. Not sure if it's affected UX though.