my camera do not work on my new device (nullpointerexcepetion)

Question

after i changed my device my camera suddently stopped working and throwing out a

java.lang.NullPointerException: Attempt to invoke virtual method 'android.hardware.Camera$Parameters android.hardware.Camera.getParameters()' on a null object reference

i had tryed to change out my catch (RuntimeException ex) to finaly but that instead gaved me a

Fail to connect to camera service” exception

public void surfaceCreated(SurfaceHolder surfaceHolder) {
    String PreviewFPS;
    String Previewsize;
    String Displayor;
    PreviewFPS = setingPreferences.getString("previewfps", "");
    Previewsize = setingPreferences.getString("screensize", "");
    Displayor = setingPreferences.getString("orientation", "");
    String[] size = Previewsize.split(",");
    try {
        camera = Camera.open();
    } catch (RuntimeException ex) {
    }
    Camera.Parameters parameters;
  parameters = camera.getParameters();

    //modificer parameterene
          parameters.setPreviewFrameRate(Integer.parseInt(PreviewFPS));
        parameters.setPreviewSize(Integer.parseInt(size[0]),Integer.parseInt(size[1]));
     camera.setParameters(parameters);
    parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
   camera.setDisplayOrientation(Integer.parseInt(Displayor));
    try {
        camera.setPreviewDisplay(surfaceHolder);
        camera.startPreview();
    } catch (Exception ex) {
    }

}

manifest

 <uses-permission android:name="android.permission.CAMERA" />
    <uses-feature android:name="android.hardware.camera" />
    <uses-feature android:name="android.hardware.camera.autofocus" />

the manufactor of the device had investigated the code and told me that the reason was due to it couldn't run the scanner and camera at once

Hi Kewin Would you please share the source code to me? as we haven't tested if it can run both the camera and scanner

We checked, the scanner and camera can not be opened in same time. Best Regards,

so my fix for this was by having my camera and scanner activity running in 2 separate activites and layouts hopefully this would help someone else

try { camera = Camera.open(); } catch (RuntimeException ex) { ex.printStackTrace(); } check output logs — Jagroshan, Feb 27 '17 at 13:55
It's not supposed to fix the error, it's supposed to show you the logs of what went wrong — OneCricketeer, Feb 27 '17 at 14:00
that was not the solution.It will print logs why camera is not initialized.Due to exception here camera is still null — Jagroshan, Feb 27 '17 at 14:00
have you added permissions or runtime permission(>=M) for camera — Pavneet_Singh, Feb 27 '17 at 14:01
give us the camera object definition. obviously you didn't initialize it correctly. — Mehran Zamani, Feb 27 '17 at 14:04
it was none of thoose things that was the issue it was related to the RFID since it couldn't handle both cam and RFID at once so after i turned the RFID off my camera got fully functional again — Kewin Björk Nielsen, Feb 28 '17 at 13:49

score 0 · Answer 1 · answered Feb 27 '17 at 14:03

0

You need all the camera code in the try and you should read the stacktraces if you actually printed them

try {
    camera = Camera.open();
    Camera.Parameters parameters = camera.getParameters();

   ... 
} catch (RuntimeException ex) {
    ex.printStackTrace();
}

// camera remains null if an exception is caught...

answered Feb 27 '17 at 14:03

OneCricketeer

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thats the only thing i see in my stacktrace analyzer `System.err: at com.kewin.device.CameraActivity.surfaceCreated(CameraActivity.java:397)` and thats `camera = Camera.open();` – Kewin Björk Nielsen Feb 27 '17 at 14:17
Then I'd suggest reading the documentation for the open() method there and see if it says why any exceptions are thrown – OneCricketeer Feb 27 '17 at 14:20
@KewinBjörkNielsen ... because you obviously didn't create an object called `camera` of type `Camera`. – Phantômaxx Feb 27 '17 at 14:20
@Kewin that class is deprecated, so I don't know why you're even using it. https://developer.android.com/reference/android/hardware/Camera.html – OneCricketeer Feb 27 '17 at 14:22
i have it here android.hardware.Camera camera; – Kewin Björk Nielsen Feb 27 '17 at 14:28
That package is entirely deprecated. Read the documentation, please – OneCricketeer Feb 27 '17 at 14:30

my camera do not work on my new device (nullpointerexcepetion)

1 Answers1