add a toggle in Settings to set keeping last-modified value

app/build.gradle

@@ -37,7 +37,7 @@ android {
 }
 
 dependencies {
-    compile 'com.simplemobiletools:commons:2.32.6'
+    compile 'com.simplemobiletools:commons:2.32.11'
     compile 'com.davemorrissey.labs:subsampling-scale-image-view:3.6.0'
     compile 'com.theartofdev.edmodo:android-image-cropper:2.4.0'
     compile 'com.bignerdranch.android:recyclerview-multiselect:0.2'

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

@@ -3,6 +3,7 @@ package com.simplemobiletools.gallery.activities
 import android.content.Intent
 import android.content.res.Resources
 import android.os.Bundle
+import android.support.v4.content.ContextCompat.startActivity
 import com.simplemobiletools.commons.dialogs.ConfirmationDialog
 import com.simplemobiletools.commons.dialogs.RadioGroupDialog
 import com.simplemobiletools.commons.dialogs.SecurityDialog
@@ -13,6 +14,7 @@ import com.simplemobiletools.commons.helpers.PROTECTION_FINGERPRINT
 import com.simplemobiletools.commons.helpers.SHOW_ALL_TABS
 import com.simplemobiletools.commons.models.RadioItem
 import com.simplemobiletools.gallery.R
+import com.simplemobiletools.gallery.R.id.*
 import com.simplemobiletools.gallery.dialogs.ManageExtendedDetailsDialog
 import com.simplemobiletools.gallery.extensions.config
 import com.simplemobiletools.gallery.helpers.ROTATE_BY_ASPECT_RATIO
@@ -50,6 +52,7 @@ class SettingsActivity : SimpleActivity() {
         setupDeleteEmptyFolders()
         setupAllowVideoGestures()
         setupShowMediaCount()
+        setupKeepLastModified()
         setupShowExtendedDetails()
         setupManageExtendedDetails()
         updateTextColors(settings_holder)
@@ -207,6 +210,14 @@ class SettingsActivity : SimpleActivity() {
         }
     }
 
+    private fun setupKeepLastModified() {
+        settings_keep_last_modified.isChecked = config.keepLastModified
+        settings_keep_last_modified_holder.setOnClickListener {
+            settings_keep_last_modified.toggle()
+            config.keepLastModified = settings_keep_last_modified.isChecked
+        }
+    }
+
     private fun setupScreenRotation() {
         settings_screen_rotation.text = getScreenRotationText()
         settings_screen_rotation_holder.setOnClickListener {

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

@@ -348,6 +348,26 @@
 
         </RelativeLayout>
 
+        <RelativeLayout
+            android:id="@+id/settings_keep_last_modified_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_keep_last_modified"
+                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/keep_last_modified"/>
+
+        </RelativeLayout>
+
         <RelativeLayout
             android:id="@+id/settings_show_extended_details_holder"
             android:layout_width="match_parent"