create a helper function for getting the proper camera impl

app/src/main/kotlin/com/simplemobiletools/camera/activities/MainActivity.kt

@@ -16,10 +16,9 @@ import com.bumptech.glide.request.RequestOptions
 import com.simplemobiletools.camera.BuildConfig
 import com.simplemobiletools.camera.R
 import com.simplemobiletools.camera.extensions.config
+import com.simplemobiletools.camera.extensions.getMyCamera
 import com.simplemobiletools.camera.extensions.navBarHeight
 import com.simplemobiletools.camera.helpers.*
-import com.simplemobiletools.camera.implementations.MyCameraOneImpl
-import com.simplemobiletools.camera.implementations.MyCameraTwoImpl
 import com.simplemobiletools.camera.interfaces.MyCamera
 import com.simplemobiletools.camera.views.FocusCircleView
 import com.simplemobiletools.camera.views.PreviewCameraOne
@@ -121,7 +120,7 @@ class MainActivity : SimpleActivity(), PreviewListener, PhotoProcessor.MediaSave
         mCurrVideoRecTimer = 0
         mCurrCameraId = 0
         mLastHandledOrientation = 0
-        mCameraImpl = if (isLollipopPlus()) MyCameraTwoImpl(applicationContext) else MyCameraOneImpl(applicationContext)
+        mCameraImpl = getMyCamera()
 
         if (config.alwaysOpenBackCamera) {
             config.lastUsedCamera = mCameraImpl.getBackCameraId()

app/src/main/kotlin/com/simplemobiletools/camera/dialogs/ChangeResolutionDialog.kt

@@ -8,6 +8,7 @@ import com.simplemobiletools.camera.R
 import com.simplemobiletools.camera.activities.SimpleActivity
 import com.simplemobiletools.camera.extensions.config
 import com.simplemobiletools.camera.extensions.getAspectRatio
+import com.simplemobiletools.camera.extensions.getMyCamera
 import com.simplemobiletools.camera.helpers.Config
 import com.simplemobiletools.commons.dialogs.RadioGroupDialog
 import com.simplemobiletools.commons.extensions.setupDialogStuff
@@ -16,7 +17,7 @@ import kotlinx.android.synthetic.main.dialog_change_resolution.view.*
 
 class ChangeResolutionDialog(val activity: SimpleActivity, val config: Config, val camera: Camera, val callback: () -> Unit) {
     var dialog: AlertDialog
-    private val isBackCamera = activity.config.lastUsedCamera == Camera.CameraInfo.CAMERA_FACING_BACK
+    private val isBackCamera = activity.config.lastUsedCamera == activity.getMyCamera().getBackCameraId()
 
     init {
         val view = LayoutInflater.from(activity).inflate(R.layout.dialog_change_resolution, null).apply {

app/src/main/kotlin/com/simplemobiletools/camera/extensions/Activity.kt

@@ -9,7 +9,7 @@ fun Activity.getPreviewRotation(cameraId: Int): Int {
     val degrees = getDeviceRotationDegrees()
 
     var result: Int
-    if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
+    if (info.facing == getMyCamera().getFrontCameraId()) {
         result = (info.orientation + degrees) % 360
         result = 360 - result
     } else {

app/src/main/kotlin/com/simplemobiletools/camera/extensions/Context.kt

@@ -4,6 +4,11 @@ import android.content.Context
 import android.graphics.Point
 import android.view.WindowManager
 import com.simplemobiletools.camera.helpers.Config
+import com.simplemobiletools.camera.helpers.ORIENT_LANDSCAPE_LEFT
+import com.simplemobiletools.camera.helpers.ORIENT_LANDSCAPE_RIGHT
+import com.simplemobiletools.camera.implementations.MyCameraOneImpl
+import com.simplemobiletools.camera.implementations.MyCameraTwoImpl
+import com.simplemobiletools.commons.helpers.isLollipopPlus
 import java.io.File
 import java.text.SimpleDateFormat
 import java.util.*
@@ -44,3 +49,12 @@ val Context.realScreenSize: Point
     }
 
 val Context.navBarHeight: Int get() = realScreenSize.y - usableScreenSize.y
+
+fun Context.getMyCamera() = if (isLollipopPlus()) MyCameraTwoImpl(applicationContext) else MyCameraOneImpl(applicationContext)
+
+fun Context.compensateDeviceRotation(orientation: Int, currCameraId: Int) = when {
+    orientation == ORIENT_LANDSCAPE_LEFT -> 270
+    orientation == ORIENT_LANDSCAPE_RIGHT -> 90
+    currCameraId == getMyCamera().getFrontCameraId() -> 180
+    else -> 0
+}

app/src/main/kotlin/com/simplemobiletools/camera/extensions/Int.kt

@@ -1,12 +0,0 @@
-package com.simplemobiletools.camera.extensions
-
-import android.hardware.Camera
-import com.simplemobiletools.camera.helpers.ORIENT_LANDSCAPE_LEFT
-import com.simplemobiletools.camera.helpers.ORIENT_LANDSCAPE_RIGHT
-
-fun Int.compensateDeviceRotation(currCameraId: Int) = when {
-    this == ORIENT_LANDSCAPE_LEFT -> 270
-    this == ORIENT_LANDSCAPE_RIGHT -> 90
-    currCameraId == Camera.CameraInfo.CAMERA_FACING_FRONT -> 180
-    else -> 0
-}

app/src/main/kotlin/com/simplemobiletools/camera/helpers/Config.kt

@@ -1,8 +1,8 @@
 package com.simplemobiletools.camera.helpers
 
 import android.content.Context
-import android.hardware.Camera
 import android.os.Environment
+import com.simplemobiletools.camera.extensions.getMyCamera
 import com.simplemobiletools.commons.helpers.BaseConfig
 import java.io.File
 
@@ -47,7 +47,7 @@ class Config(context: Context) : BaseConfig(context) {
         set(flipPhotos) = prefs.edit().putBoolean(FLIP_PHOTOS, flipPhotos).apply()
 
     var lastUsedCamera: Int
-        get() = prefs.getInt(LAST_USED_CAMERA, Camera.CameraInfo.CAMERA_FACING_BACK)
+        get() = prefs.getInt(LAST_USED_CAMERA, context.getMyCamera().getBackCameraId())
         set(cameraId) = prefs.edit().putInt(LAST_USED_CAMERA, cameraId).apply()
 
     var flashlightState: Int

app/src/main/kotlin/com/simplemobiletools/camera/helpers/Constants.kt

@@ -1,29 +1,29 @@
 package com.simplemobiletools.camera.helpers
 
-val ORIENT_PORTRAIT = 0
-val ORIENT_LANDSCAPE_LEFT = 1
-val ORIENT_LANDSCAPE_RIGHT = 2
+const val ORIENT_PORTRAIT = 0
+const val ORIENT_LANDSCAPE_LEFT = 1
+const val ORIENT_LANDSCAPE_RIGHT = 2
 
 // shared preferences
-val SAVE_PHOTOS = "save_photos"
-val SHOW_PREVIEW = "show_preview"
-val SOUND = "sound"
-val FOCUS_BEFORE_CAPTURE = "focus_before_capture"
-val VOLUME_BUTTONS_AS_SHUTTER = "volume_buttons_as_shutter"
-val TURN_FLASH_OFF_AT_STARTUP = "turn_flash_off_at_startup"
-val FLIP_PHOTOS = "flip_photos"
-val LAST_USED_CAMERA = "last_used_camera"
-val FLASHLIGHT_STATE = "flashlight_state"
-val BACK_PHOTO_RESOLUTION_INDEX = "back_photo_resolution_index"
-val BACK_VIDEO_RESOLUTION_INDEX = "back_video_resolution_index"
-val FRONT_PHOTO_RESOLUTION_INDEX = "front_photo_resolution_index"
-val FRONT_VIDEO_RESOLUTION_INDEX = "front_video_resolution_index"
-val PHOTO_PREVIEW_HINT_SHOWN = "photo_preview_hint_shown"
-val KEEP_SETTINGS_VISIBLE = "keep_settings_visible"
-val ALWAYS_OPEN_BACK_CAMERA = "always_open_back_camera"
-val SAVE_PHOTO_METADATA = "save_photo_metadata"
-val PHOTO_QUALITY = "photo_quality"
+const val SAVE_PHOTOS = "save_photos"
+const val SHOW_PREVIEW = "show_preview"
+const val SOUND = "sound"
+const val FOCUS_BEFORE_CAPTURE = "focus_before_capture"
+const val VOLUME_BUTTONS_AS_SHUTTER = "volume_buttons_as_shutter"
+const val TURN_FLASH_OFF_AT_STARTUP = "turn_flash_off_at_startup"
+const val FLIP_PHOTOS = "flip_photos"
+const val LAST_USED_CAMERA = "last_used_camera"
+const val FLASHLIGHT_STATE = "flashlight_state"
+const val BACK_PHOTO_RESOLUTION_INDEX = "back_photo_resolution_index"
+const val BACK_VIDEO_RESOLUTION_INDEX = "back_video_resolution_index"
+const val FRONT_PHOTO_RESOLUTION_INDEX = "front_photo_resolution_index"
+const val FRONT_VIDEO_RESOLUTION_INDEX = "front_video_resolution_index"
+const val PHOTO_PREVIEW_HINT_SHOWN = "photo_preview_hint_shown"
+const val KEEP_SETTINGS_VISIBLE = "keep_settings_visible"
+const val ALWAYS_OPEN_BACK_CAMERA = "always_open_back_camera"
+const val SAVE_PHOTO_METADATA = "save_photo_metadata"
+const val PHOTO_QUALITY = "photo_quality"
 
-val FLASH_OFF = 0
-val FLASH_ON = 1
-val FLASH_AUTO = 2
+const val FLASH_OFF = 0
+const val FLASH_ON = 1
+const val FLASH_AUTO = 2

app/src/main/kotlin/com/simplemobiletools/camera/helpers/PhotoProcessor.kt

@@ -3,17 +3,13 @@ package com.simplemobiletools.camera.helpers
 import android.graphics.Bitmap
 import android.graphics.BitmapFactory
 import android.graphics.Matrix
-import android.hardware.Camera
 import android.media.ExifInterface
 import android.net.Uri
 import android.os.AsyncTask
 import android.os.Environment
 import com.simplemobiletools.camera.R
 import com.simplemobiletools.camera.activities.MainActivity
-import com.simplemobiletools.camera.extensions.compensateDeviceRotation
-import com.simplemobiletools.camera.extensions.config
-import com.simplemobiletools.camera.extensions.getOutputMediaFile
-import com.simplemobiletools.camera.extensions.getPreviewRotation
+import com.simplemobiletools.camera.extensions.*
 import com.simplemobiletools.commons.extensions.*
 import com.simplemobiletools.commons.helpers.isNougatPlus
 import java.io.File
@@ -72,7 +68,7 @@ class PhotoProcessor(val activity: MainActivity, val uri: Uri?, val currCameraId
             var image = BitmapFactory.decodeByteArray(data, 0, data.size)
             val exif = ExifInterface(photoFile.toString())
 
-            val deviceRot = deviceOrientation.compensateDeviceRotation(currCameraId)
+            val deviceRot = activity.compensateDeviceRotation(deviceOrientation, currCameraId)
             val previewRot = activity.getPreviewRotation(currCameraId)
             val orient = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_UNDEFINED)
             val imageRot = orient.degreesFromOrientation()
@@ -82,7 +78,7 @@ class PhotoProcessor(val activity: MainActivity, val uri: Uri?, val currCameraId
                 image = rotate(image, totalRotation)
             }
 
-            if (currCameraId == Camera.CameraInfo.CAMERA_FACING_FRONT && !activity.config.flipPhotos) {
+            if (currCameraId == activity.getMyCamera().getFrontCameraId() && !activity.config.flipPhotos) {
                 val matrix = Matrix()
                 if (path.startsWith(activity.internalStoragePath)) {
                     matrix.preScale(1f, -1f)

app/src/main/kotlin/com/simplemobiletools/camera/views/PreviewCameraOne.kt

@@ -735,7 +735,7 @@ class PreviewCameraOne : ViewGroup, SurfaceHolder.Callback, MediaScannerConnecti
     }
 
     private fun getVideoRotation(): Int {
-        val deviceRot = mActivity!!.mLastHandledOrientation.compensateDeviceRotation(mCurrCameraId)
+        val deviceRot = mActivity!!.compensateDeviceRotation(mActivity!!.mLastHandledOrientation, mCurrCameraId)
         val previewRot = mActivity!!.getPreviewRotation(mCurrCameraId)
         return (deviceRot + previewRot) % 360
     }