Have you tried restarting your phone and directly starting the stock /
default camera app? Can you reproduce the problem then without starting
your own app? If in that case the screen turns black again you probably
have a faulty camera driver on your phone.
But in my own experience is probably related to a misuse or
misconfiguration of the Camera object. On some devices the camera can be
really fragile. Some drivers cannot cope with faulty settings or certain
conditions. They crash and do not recover anymore unless you restart your
phone.
First of all it is important to check the available features and
resolutions returned by the Camera object. Do not set anything else than
what is supported and provided by the camera.
Another important issue is the correct sequence of events according to your
activity life cycle:
- Activity.onResume
- Camera.open
- SurfaceHolder.Callback.surfaceCreated
- camera.setPreviewDisplay
- SurfaceHolder.Callback.surfaceChanged
- camera.setParameters (only set a valid, available preview
size<http://developer.android.com/reference/android/hardware/Camera.Parameters.html#getSupportedPreviewSizes()>
)
- camera.startPreview
- Activity.onPause
- camera.stopPreview
- camera.release
It is important to use onResume and onPause for opening and releasing the
Camera object in order to avoid that these operations intersect with the
life cycle of another Activity. If you release your camera in onStop or
onDestroy for example a different Activity could already have executed
onStart and do something with the camera at the same time.
On Tuesday, January 22, 2013 6:41:28 AM UTC-6, sameer khan wrote:
>
> I have developed the camera app to capture the image and it is working
> fine.
> Someimes when we perform multiple clicks(4-5 times) on cam icon to capture
> the image followed by home button, App unable to start the camera on
> device. Same issue is reflected in default camera app as well.
>
>
>
>
> <https://lh6.googleusercontent.com/-9cR1VC3vkZI/UP6IpmQhdOI/AAAAAAAAABY/K5hQJOpTPxA/s1600/scanfront.png>
>
>
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