B1CL0PS B1CL0PS - 6 months ago 332
Android Question

Android Camera2 API SecurityException

I'm trying to use the new Android camera2 api. I started with source from this tutorial : http://jylee-world.blogspot.com/2014/12/a-tutorial-of-androidhardwarecamera2.html . When I try to usb-debug-deploy it to any phone, I get a SecurityException from

CameraManager.openCamera(...)
.

My AndroidManifest looks like this:

<uses-feature android:name="com.android.hardware.camera2.full"/>
<uses-permission android:name="android.permission.CAMERA"/>


This seems to be what every tutorial I've been able to find does. I'm able to get permission for other actions; for example, I can make the camera vibrate just fine. I'm also able to enumerate cameras with
CameraManager.getCameraIdLists()
just fine, but I'm not sure if that actually requires permission. But I can't
openCamera
.

Are there some additional permissions I need? Am I doing something wrong?

Thanks for the help!

This is my full stack trace:

SecurityException
java.lang.SecurityException: Lacking privileges to access camera serviceat android.hardware.camera2.utils.CameraBinderDecorator.throwOnError(CameraBinderDecorator.java:108)
at android.hardware.camera2.legacy.CameraDeviceUserShim.connectBinderShim(CameraDeviceUserShim.java:336)
at android.hardware.camera2.CameraManager.openCameraDeviceUserAsync(CameraManager.java:327)
at android.hardware.camera2.CameraManager.openCamera(CameraManager.java:457)
at com.example.quinnfreedman.camera2test.MainActivity$1.onSurfaceTextureAvailable(MainActivity.java:74)
at android.view.TextureView.getHardwareLayer(TextureView.java:368)
at android.view.View.updateDisplayListIfDirty(View.java:15167)
at android.view.View.draw(View.java:15964)
at android.view.ViewGroup.drawChild(ViewGroup.java:3612)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3402)
at android.view.View.updateDisplayListIfDirty(View.java:15185)
at android.view.View.draw(View.java:15964)
at android.view.ViewGroup.drawChild(ViewGroup.java:3612)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3402)
at android.view.View.updateDisplayListIfDirty(View.java:15185)
at android.view.View.draw(View.java:15964)
at android.view.ViewGroup.drawChild(ViewGroup.java:3612)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3402)
at android.view.View.updateDisplayListIfDirty(View.java:15185)
at android.view.View.draw(View.java:15964)
at android.view.ViewGroup.drawChild(ViewGroup.java:3612)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3402)
at android.view.View.draw(View.java:16197)
at com.android.internal.policy.PhoneWindow$DecorView.draw(PhoneWindow.java:2690)
at android.view.View.updateDisplayListIfDirty(View.java:15190)
at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:281)
at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:287)
at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:322)
at android.view.ViewRootImpl.draw(ViewRootImpl.java:2627)
at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2446)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2079)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1119)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6060)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858)
at android.view.Choreographer.doCallbacks(Choreographer.java:670)
at android.view.Choreographer.doFrame(Choreographer.java:606)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844)
at android.os.Handler.handleCallback(Handler.java:746)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5443)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)

Answer

In Android M, run time permission check is required for dangerous permission. You can see dangerous permission [here][1].

Check for permission :

// Assume thisActivity is the current activity
int permissionCheck = ContextCompat.checkSelfPermission(thisActivity,
        Manifest.permission.CAMERA);

If the app has the permission, the method returns PackageManager.PERMISSION_GRANTED, and the app can proceed with the operation. If the app does not have the permission, the method returns PERMISSION_DENIED, and the app has to explicitly ask the user for permission.

For details: https://developer.android.com/training/permissions/requesting.html#perm-request

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