fix #76, add a toggle for always opening the back camera at startup

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

@@ -77,4 +77,8 @@ class Config(context: Context) : BaseConfig(context) {
     var keepSettingsVisible: Boolean
         get() = prefs.getBoolean(KEEP_SETTINGS_VISIBLE, false)
         set(keepSettingsVisible) = prefs.edit().putBoolean(KEEP_SETTINGS_VISIBLE, keepSettingsVisible).apply()
+
+    var alwaysOpenBackCamera: Boolean
+        get() = prefs.getBoolean(ALWAYS_OPEN_BACK_CAMERA, false)
+        set(alwaysOpenBackCamera) = prefs.edit().putBoolean(ALWAYS_OPEN_BACK_CAMERA, alwaysOpenBackCamera).apply()
 }

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

@@ -20,6 +20,7 @@ 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 FLASH_OFF = 0
 val FLASH_ON = 1

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

@@ -56,6 +56,9 @@ class MainActivity : SimpleActivity(), PreviewListener, PhotoProcessor.MediaSave
         super.onCreate(savedInstanceState)
         requestWindowFeature(Window.FEATURE_NO_TITLE)
         window.addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN)
+        if (config.alwaysOpenBackCamera)
+            config.lastUsedCamera = Camera.CameraInfo.CAMERA_FACING_BACK
+
         initVariables()
         tryInitCamera()
         supportActionBar?.hide()

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

@@ -32,6 +32,7 @@ class SettingsActivity : SimpleActivity() {
         setupTurnFlashOffAtStartup()
         setupFlipPhotos()
         setupKeepSettingsVisible()
+        setupAlwaysOpenBackCamera()
         updateTextColors(settings_holder)
     }
 
@@ -126,4 +127,12 @@ class SettingsActivity : SimpleActivity() {
             config.keepSettingsVisible = settings_keep_settings_visible.isChecked
         }
     }
+
+    private fun setupAlwaysOpenBackCamera() {
+        settings_always_open_back_camera.isChecked = config.alwaysOpenBackCamera
+        settings_always_open_back_camera_holder.setOnClickListener {
+            settings_always_open_back_camera.toggle()
+            config.alwaysOpenBackCamera = settings_always_open_back_camera.isChecked
+        }
+    }
 }

app/src/main/res/layout/activity_settings.xml

@@ -204,5 +204,25 @@
                 android:text="@string/keep_settings_visible"/>
 
         </RelativeLayout>
+
+        <RelativeLayout
+            android:id="@+id/settings_always_open_back_camera_holder"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="@dimen/medium_margin"
+            android:background="?attr/selectableItemBackground"
+            android:padding="@dimen/activity_margin">
+
+            <com.simplemobiletools.commons.views.MySwitchCompat
+                android:id="@+id/settings_always_open_back_camera"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:background="@null"
+                android:clickable="false"
+                android:paddingLeft="@dimen/medium_margin"
+                android:paddingStart="@dimen/medium_margin"
+                android:text="@string/always_open_back_camera"/>
+
+        </RelativeLayout>
     </LinearLayout>
 </ScrollView>