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Open the camera on your Nexus 7 tablet

I developed a camera app in android. It captures an image using a surface view. Below is the code I used to open the camera

try { // attempt to get a Front Camera instance c = Camera.open(Camera.CameraInfo.CAMERA_FACING_FRONT); } catch (Exception e) { // TODO Auto-generated catch block System.out .println("fail to connect to Front Camera"); } if (c == null) { try { // attempt to get a Back Camera instance c = Camera.open(1); } catch (Exception e) { // TODO: handle exception System.out .println("fail to connect to Camera with id = 1"); } } if (c == null) { try { // attempt to get a Back Camera instance c = Camera.open(0); } catch (Exception e) { // TODO: handle exception System.out .println("fail to connect to Camera with id = 0"); } } if (c == null) { try { // attempt to get a Back Camera instance c = Camera.open(); } catch (Exception e) { // TODO: handle exception System.out .println("fail to connect to Back Camera"); return c; }

Where c is the camera object.

It works fine in other phones except the Nexus 7 tablet. In Nexus 7, the code throws an exception in all cases except the last one, i.e. c = Camera.open(); but still the object c is null .

Here is the stack trace

 11-22 12:36:57.559 W/System.err(7621): java.lang.NullPointerException 11-22 12:36:57.559 W/System.err(7621): at com.MyPackage.OpenCamera.getFrontCameraInstance(OpenCamera.java:238) 11-22 12:36:57.559 W/System.err(7621): at com.MyPackage.OpenCamera.onCreate(OpenCamera.java:123) 11-22 12:36:57.559 W/System.err(7621): at android.app.Activity.performCreate(Activity.java:5104) 11-22 12:36:57.559 W/System.err(7621): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 11-22 12:36:57.559 W/System.err(7621): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 11-22 12:36:57.559 W/System.err(7621): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 11-22 12:36:57.559 W/System.err(7621): at android.app.ActivityThread.access$600(ActivityThread.java:141) 11-22 12:36:57.559 W/System.err(7621): at android.app.ActivityThread $H.handleMessage(ActivityThread.java:1234) 11-22 12:36:57.559 W/System.err(7621): at android.os.Handler.dispatchMessage(Handler.java:99) 11-22 12:36:57.559 W/System.err(7621): at android.os.Looper.loop (Looper.java:137) 11-22 12:36:57.559 W/System.err(7621): at android.app.ActivityThread.main (ActivityThread.java:5039) 11-22 12:36:57.559 W/System.err(7621): at java.lang.reflect.Method.invokeNative(Native Method) 11-22 12:36:57.559 W/System.err(7621): at java.lang.reflect.Method.invoke (Method.java:511) 11-22 12:36:57.559 W/System.err(7621): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:793) 11-22 12:36:57.559 W/System.err(7621): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 11-22 12:36:57.559 W/System.err(7621): at dalvik.system.NativeStart.main (Native Method) 11-22 12:36:57.559 I/System.out(7621): Error in setting Parameter 11-22 12:36:57.609 I/ActivityManager(480): Displayed 11-22 12:36:57.679 W/System.err(7621): at android.location.Geocoder.getFromLocation(Geocoder.java:136) 11-22 12:36:57.679 W/System.err(7621): at com.MyPackage.OpenCamera. $MyTimmer$1.run(OpenCamera.java:336) 11-22 12:36:57.679 W/System.err(7621): java.lang.NullPointerException 11-22 12:36:57.679 W/System.err(7621): at com.MyPackage.OpenCamera. $MyTimmer$1.run(OpenCamera.java:344)

Therefore, I cannot use it to capture an image. Any solution ???

Thanks...

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2 answers

When using the following code on Nexus 7: int cameraId = CameraInfo.CAMERA_FACING_FRONT; However, CameraId is 1, as you saw, using 1, since the parameter leads to an error. I found that using 0 instead of 1 works, but the camera should be released after each use, so I go and call Camera.open (cameraId) .release (); I understand that this is ugly, but it seems to be a problem with Nexus 7.

  int cameraId = -1; boolean errorFound = false; boolean hasFeatCamera = getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA); if (hasFeatCamera) { try{ cameraId = CameraInfo.CAMERA_FACING_BACK; Camera.open(cameraId).release(); }catch(Exception e){ Camera.open(0).release(); } } else if(CameraInfo.CAMERA_FACING_FRONT>-1){ try{ cameraId = CameraInfo.CAMERA_FACING_FRONT; Camera.open(cameraId).release(); }catch(Exception e){ errorFound = true; } if(errorFound){ try{ Camera.open(0).release(); // Put in for Nexus 7 as CameraInfo.CAMERA_FACING_FRONT= 1 but it only loads if the id is actually 0 cameraId = 0; }catch(Exception e){ cameraId = -1; } } } if(cameraId<0){ Toast.makeText(this, "No camera found.", Toast.LENGTH_LONG).show(); }
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A little late, but maybe this helps someone. I had the same problem and could not get the Nexus 7 camera to work with any index supplied in getCamera (idx).

I installed the Kamera Nexus 7 camera app from the game store. I did not have a camera application after reset / update. This application worked, and after I used it once, I could get a cam using Camera.getCamera (0);

So, maybe there is an additional “unlock requirement” that is not addressed here in the answers? (They did not work for me, before installing the application)

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