store/restore last used camera lens

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

@@ -0,0 +1,11 @@
+package com.simplemobiletools.camera.extensions
+
+import androidx.camera.core.CameraSelector
+
+fun CameraSelector.toLensFacing(): Int {
+    return if (this == CameraSelector.DEFAULT_FRONT_CAMERA) {
+        CameraSelector.LENS_FACING_FRONT
+    } else {
+        CameraSelector.LENS_FACING_BACK
+    }
+}

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

@@ -1,5 +1,6 @@
 package com.simplemobiletools.camera.extensions
 
+import androidx.camera.core.CameraSelector
 import androidx.camera.core.ImageCapture
 import com.simplemobiletools.camera.helpers.FLASH_AUTO
 import com.simplemobiletools.camera.helpers.FLASH_OFF
@@ -23,3 +24,12 @@ fun Int.toAppFlashMode(): Int {
         else -> throw IllegalArgumentException("Unknown mode: $this")
     }
 }
+
+fun Int.toCameraSelector(): CameraSelector {
+    return if (this == CameraSelector.LENS_FACING_FRONT) {
+        CameraSelector.DEFAULT_FRONT_CAMERA
+    } else {
+        CameraSelector.DEFAULT_BACK_CAMERA
+    }
+}
+

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

@@ -2,6 +2,7 @@ package com.simplemobiletools.camera.helpers
 
 import android.content.Context
 import android.os.Environment
+import androidx.camera.core.CameraSelector
 import com.simplemobiletools.commons.helpers.BaseConfig
 import java.io.File
 
@@ -37,6 +38,10 @@ class Config(context: Context) : BaseConfig(context) {
         get() = prefs.getString(LAST_USED_CAMERA, "0")!!
         set(cameraId) = prefs.edit().putString(LAST_USED_CAMERA, cameraId).apply()
 
+    var lastUsedCameraLens: Int
+        get() = prefs.getInt(LAST_USED_CAMERA_LENS, CameraSelector.LENS_FACING_BACK)
+        set(lens) = prefs.edit().putInt(LAST_USED_CAMERA_LENS, lens).apply()
+
     var initPhotoMode: Boolean
         get() = prefs.getBoolean(INIT_PHOTO_MODE, true)
         set(initPhotoMode) = prefs.edit().putBoolean(INIT_PHOTO_MODE, initPhotoMode).apply()

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

@@ -10,6 +10,7 @@ const val SOUND = "sound"
 const val VOLUME_BUTTONS_AS_SHUTTER = "volume_buttons_as_shutter"
 const val FLIP_PHOTOS = "flip_photos"
 const val LAST_USED_CAMERA = "last_used_camera_2"
+const val LAST_USED_CAMERA_LENS = "last_used_camera_lens"
 const val FLASHLIGHT_STATE = "flashlight_state"
 const val INIT_PHOTO_MODE = "init_photo_mode"
 const val BACK_PHOTO_RESOLUTION_INDEX = "back_photo_resolution_index_2"

app/src/main/kotlin/com/simplemobiletools/camera/implementations/CameraXPreview.kt

@@ -43,10 +43,11 @@ import com.bumptech.glide.load.ImageHeaderParser.UNKNOWN_ORIENTATION
 import com.simplemobiletools.camera.R
 import com.simplemobiletools.camera.extensions.config
 import com.simplemobiletools.camera.extensions.toAppFlashMode
+import com.simplemobiletools.camera.extensions.toCameraSelector
 import com.simplemobiletools.camera.extensions.toCameraXFlashMode
+import com.simplemobiletools.camera.extensions.toLensFacing
 import com.simplemobiletools.camera.helpers.MediaSoundHelper
 import com.simplemobiletools.camera.helpers.PinchToZoomOnScaleGestureListener
-import com.simplemobiletools.camera.helpers.ZoomCalculator
 import com.simplemobiletools.camera.interfaces.MyPreview
 import com.simplemobiletools.commons.extensions.showErrorToast
 import com.simplemobiletools.commons.extensions.toast
@@ -110,7 +111,7 @@ class CameraXPreview(
         get() = cameraProvider?.availableCameraInfos?.size ?: 0
 
     private val frontCameraInUse: Boolean
-        get() = lensFacing == CameraSelector.DEFAULT_FRONT_CAMERA
+        get() = cameraSelector == CameraSelector.DEFAULT_FRONT_CAMERA
 
     private var preview: Preview? = null
     private var cameraProvider: ProcessCameraProvider? = null
@@ -119,7 +120,7 @@ class CameraXPreview(
     private var camera: Camera? = null
     private var currentRecording: Recording? = null
     private var recordingState: VideoRecordEvent? = null
-    private var lensFacing = CameraSelector.DEFAULT_BACK_CAMERA
+    private var cameraSelector = config.lastUsedCameraLens.toCameraSelector()
     private var flashMode = config.flashlightState.toCameraXFlashMode()
     private var isPhotoCapture = config.initPhotoMode
 
@@ -161,7 +162,7 @@ class CameraXPreview(
         cameraProvider.unbindAll()
         camera = cameraProvider.bindToLifecycle(
             activity,
-            lensFacing,
+            cameraSelector,
             preview,
             captureUseCase,
         )
@@ -332,11 +333,13 @@ class CameraXPreview(
     }
 
     override fun toggleFrontBackCamera() {
-        lensFacing = if (frontCameraInUse) {
+        val newCameraSelector = if (frontCameraInUse) {
             CameraSelector.DEFAULT_BACK_CAMERA
         } else {
             CameraSelector.DEFAULT_FRONT_CAMERA
         }
+        cameraSelector = newCameraSelector
+        config.lastUsedCameraLens = newCameraSelector.toLensFacing()
         startCamera()
     }