add a toggle for using english

app/src/main/AndroidManifest.xml

@@ -19,6 +19,7 @@
         tools:node="remove"/>
 
     <application
+        android:name=".App"
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_launcher_name"

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

@@ -0,0 +1,17 @@
+package com.simplemobiletools.camera
+
+import android.app.Application
+import com.simplemobiletools.camera.extensions.config
+import java.util.*
+
+class App : Application() {
+    override fun onCreate() {
+        super.onCreate()
+
+        if (config.useEnglish) {
+            val conf = resources.configuration
+            conf.locale = Locale.ENGLISH
+            resources.updateConfiguration(conf, resources.displayMetrics)
+        }
+    }
+}

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

@@ -66,6 +66,49 @@ class MainActivity : SimpleActivity(), PreviewListener, PhotoProcessor.MediaSave
         setupOrientationEventListener()
     }
 
+    override fun onResume() {
+        super.onResume()
+        if (hasStorageAndCameraPermissions()) {
+            resumeCameraItems()
+            setupPreviewImage(mIsInPhotoMode)
+            scheduleFadeOut()
+            mFocusRectView.setStrokeColor(config.primaryColor)
+
+            if (mIsVideoCaptureIntent && mIsInPhotoMode) {
+                handleTogglePhotoVideo()
+                checkButtons()
+            }
+            toggleBottomButtons(false)
+        }
+        window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
+        if (hasStorageAndCameraPermissions()) {
+            mOrientationEventListener.enable()
+        }
+    }
+
+    override fun onPause() {
+        super.onPause()
+        window.clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
+        if (!hasStorageAndCameraPermissions() || isAskingPermissions) {
+            return
+        }
+
+        mFadeHandler.removeCallbacksAndMessages(null)
+
+        hideTimer()
+        mPreview?.releaseCamera()
+        mOrientationEventListener.disable()
+
+        if (mPreview?.isWaitingForTakePictureCallback == true) {
+            toast(R.string.photo_not_saved)
+        }
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        mPreview?.releaseCamera()
+    }
+
     private fun initVariables() {
         mRes = resources
         mIsInPhotoMode = false
@@ -418,26 +461,6 @@ class MainActivity : SimpleActivity(), PreviewListener, PhotoProcessor.MediaSave
         })
     }
 
-    override fun onResume() {
-        super.onResume()
-        if (hasStorageAndCameraPermissions()) {
-            resumeCameraItems()
-            setupPreviewImage(mIsInPhotoMode)
-            scheduleFadeOut()
-            mFocusRectView.setStrokeColor(config.primaryColor)
-
-            if (mIsVideoCaptureIntent && mIsInPhotoMode) {
-                handleTogglePhotoVideo()
-                checkButtons()
-            }
-            toggleBottomButtons(false)
-        }
-        window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
-        if (hasStorageAndCameraPermissions()) {
-            mOrientationEventListener.enable()
-        }
-    }
-
     private fun resumeCameraItems() {
         showToggleCameraIfNeeded()
         if (mPreview?.setCamera(mCurrCameraId) == true) {
@@ -456,24 +479,6 @@ class MainActivity : SimpleActivity(), PreviewListener, PhotoProcessor.MediaSave
         toggle_camera.beInvisibleIf(Camera.getNumberOfCameras() <= 1)
     }
 
-    override fun onPause() {
-        super.onPause()
-        window.clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
-        if (!hasStorageAndCameraPermissions() || isAskingPermissions) {
-            return
-        }
-
-        mFadeHandler.removeCallbacksAndMessages(null)
-
-        hideTimer()
-        mPreview?.releaseCamera()
-        mOrientationEventListener.disable()
-
-        if (mPreview?.isWaitingForTakePictureCallback == true) {
-            toast(R.string.photo_not_saved)
-        }
-    }
-
     private fun hasStorageAndCameraPermissions() = hasPermission(PERMISSION_WRITE_STORAGE) && hasPermission(PERMISSION_CAMERA)
 
     private fun setupOrientationEventListener() {
@@ -563,11 +568,6 @@ class MainActivity : SimpleActivity(), PreviewListener, PhotoProcessor.MediaSave
         }
     }
 
-    override fun onDestroy() {
-        super.onDestroy()
-        mPreview?.releaseCamera()
-    }
-
     private fun checkWhatsNewDialog() {
         arrayListOf<Release>().apply {
             add(Release(33, R.string.release_33))

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

@@ -7,12 +7,15 @@ import com.simplemobiletools.camera.BuildConfig
 import com.simplemobiletools.camera.R
 import com.simplemobiletools.camera.extensions.config
 import com.simplemobiletools.commons.dialogs.FilePickerDialog
+import com.simplemobiletools.commons.extensions.beVisibleIf
 import com.simplemobiletools.commons.extensions.humanizePath
 import com.simplemobiletools.commons.extensions.updateTextColors
+import com.simplemobiletools.commons.extensions.useEnglishToggled
 import com.simplemobiletools.commons.helpers.LICENSE_GLIDE
 import com.simplemobiletools.commons.helpers.LICENSE_KOTLIN
 import kotlinx.android.synthetic.main.activity_settings.*
 import java.io.File
+import java.util.*
 
 class SettingsActivity : SimpleActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -24,6 +27,7 @@ class SettingsActivity : SimpleActivity() {
         super.onResume()
 
         setupCustomizeColors()
+        setupUseEnglish()
         setupSavePhotosFolder()
         setupShowPreview()
         setupSound()
@@ -56,6 +60,16 @@ class SettingsActivity : SimpleActivity() {
         }
     }
 
+    private fun setupUseEnglish() {
+        settings_use_english_holder.beVisibleIf(config.wasUseEnglishToggled || Locale.getDefault().language != "en")
+        settings_use_english.isChecked = config.useEnglish
+        settings_use_english_holder.setOnClickListener {
+            settings_use_english.toggle()
+            config.useEnglish = settings_use_english.isChecked
+            useEnglishToggled()
+        }
+    }
+
     private fun setupSavePhotosFolder() {
         settings_save_photos.text = getLastPart(config.savePhotosFolder)
         settings_save_photos_holder.setOnClickListener {

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

@@ -30,6 +30,26 @@
 
         </RelativeLayout>
 
+        <RelativeLayout
+            android:id="@+id/settings_use_english_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_use_english"
+                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/use_english_language"/>
+
+        </RelativeLayout>
+
         <RelativeLayout
             android:id="@+id/settings_save_photos_holder"
             android:layout_width="match_parent"