由于Android中的相机而崩溃

Question

We created an android native app and it is crashing under certain conditions. It has to do with the camera certainly, but not exactly sure what it could be.

I would like to highlight that I am not an android developer (I develop mostly in python) but I wonder if the android experts out there can provide some context about the error.

Here is the stack trace from the google play console:

java.lang.RuntimeException: 
  at android.hardware.Camera.native_setParameters (Native Method)
  at android.hardware.Camera.setParameters (Camera.java:1946)
  at identidata.br.camera.CameraPicturePreview.surfaceChanged (CameraPicturePreview.java:75)
  at android.view.SurfaceView.updateWindow (SurfaceView.java:611)
  at android.view.SurfaceView$3.onPreDraw (SurfaceView.java:181)
  at android.view.ViewTreeObserver.dispatchOnPreDraw (ViewTreeObserver.java:944)
  at android.view.ViewRootImpl.performTraversals (ViewRootImpl.java:2000)
  at android.view.ViewRootImpl.doTraversal (ViewRootImpl.java:1073)
  at android.view.ViewRootImpl$TraversalRunnable.run (ViewRootImpl.java:5985)
  at android.view.Choreographer$CallbackRecord.run (Choreographer.java:767)
  at android.view.Choreographer.doCallbacks (Choreographer.java:580)
  at android.view.Choreographer.doFrame (Choreographer.java:550)
  at android.view.Choreographer$FrameDisplayEventReceiver.run (Choreographer.java:753)
  at android.os.Handler.handleCallback (Handler.java:739)
  at android.os.Handler.dispatchMessage (Handler.java:95)
  at android.os.Looper.loop (Looper.java:135)
  at android.app.ActivityThread.main (ActivityThread.java:5912)
  at java.lang.reflect.Method.invoke (Native Method)
  at java.lang.reflect.Method.invoke (Method.java:372)
  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:1405)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1200)

Answer 1

Android Camera API documents that Camera.setParameters() may throw a RuntimeException if something goes wrong. Taking into account the Android fragmentation, you have a chance to trigger some hidden incompatibility with any innocent call to setParameters(). Therefore, I strongly recommend to always try … catch RuntimeException around this call.

I won't be surprised if your specific crash happens because you try to set unsupported preview size when you process the surfaceChanged() callback. This callback comes with width and height parameters, and it is a natural temptation to use these values for Camera.Parameters.setPreviewSize() . Unfortunately, this won't work. You must always choose one of the values from the list of supported Preview Sizes .