avoid initializing the first 3 fragments unnecessarily

app/build.gradle

@@ -61,7 +61,7 @@ android {
 }
 
 dependencies {
-    implementation 'com.simplemobiletools:commons:5.12.17'
+    implementation 'com.simplemobiletools:commons:5.12.22'
     implementation 'com.theartofdev.edmodo:android-image-cropper:2.8.0'
     implementation 'androidx.multidex:multidex:2.0.1'
     implementation 'it.sephiroth.android.exif:library:1.0.1'

app/src/main/kotlin/com/simplemobiletools/gallery/pro/activities/ViewPagerActivity.kt

@@ -366,8 +366,10 @@ class ViewPagerActivity : SimpleActivity(), ViewPager.OnPageChangeListener, View
     private fun updatePagerItems(media: MutableList<Medium>) {
         val pagerAdapter = MyPagerAdapter(this, supportFragmentManager, media)
         if (!isDestroyed) {
+            pagerAdapter.shouldInitFragment = mPos < 5
             view_pager.apply {
                 adapter = pagerAdapter
+                pagerAdapter.shouldInitFragment = true
                 currentItem = mPos
                 removeOnPageChangeListener(this@ViewPagerActivity)
                 addOnPageChangeListener(this@ViewPagerActivity)

app/src/main/kotlin/com/simplemobiletools/gallery/pro/adapters/MyPagerAdapter.kt

@@ -12,16 +12,20 @@ import com.simplemobiletools.gallery.pro.fragments.PhotoFragment
 import com.simplemobiletools.gallery.pro.fragments.VideoFragment
 import com.simplemobiletools.gallery.pro.fragments.ViewPagerFragment
 import com.simplemobiletools.gallery.pro.helpers.MEDIUM
+import com.simplemobiletools.gallery.pro.helpers.SHOULD_INIT_FRAGMENT
 import com.simplemobiletools.gallery.pro.models.Medium
 
 class MyPagerAdapter(val activity: ViewPagerActivity, fm: FragmentManager, val media: MutableList<Medium>) : FragmentStatePagerAdapter(fm) {
     private val fragments = HashMap<Int, ViewPagerFragment>()
+    var shouldInitFragment = true
+
     override fun getCount() = media.size
 
     override fun getItem(position: Int): Fragment {
         val medium = media[position]
         val bundle = Bundle()
         bundle.putSerializable(MEDIUM, medium)
+        bundle.putBoolean(SHOULD_INIT_FRAGMENT, shouldInitFragment)
         val fragment = if (medium.isVideo()) {
             VideoFragment()
         } else {

app/src/main/kotlin/com/simplemobiletools/gallery/pro/fragments/PhotoFragment.kt

@@ -40,10 +40,7 @@ import com.simplemobiletools.gallery.pro.R
 import com.simplemobiletools.gallery.pro.activities.PanoramaPhotoActivity
 import com.simplemobiletools.gallery.pro.activities.PhotoActivity
 import com.simplemobiletools.gallery.pro.extensions.*
-import com.simplemobiletools.gallery.pro.helpers.MEDIUM
+import com.simplemobiletools.gallery.pro.helpers.*
-import com.simplemobiletools.gallery.pro.helpers.PATH
-import com.simplemobiletools.gallery.pro.helpers.PicassoDecoder
-import com.simplemobiletools.gallery.pro.helpers.PicassoRegionDecoder
 import com.simplemobiletools.gallery.pro.models.Medium
 import com.simplemobiletools.gallery.pro.svg.SvgSoftwareLayerSetter
 import com.squareup.picasso.Callback
@@ -90,7 +87,12 @@ class PhotoFragment : ViewPagerFragment() {
     private lateinit var mMedium: Medium
 
     override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
-        mView = (inflater.inflate(R.layout.pager_photo_item, container, false) as ViewGroup).apply {
+        mView = (inflater.inflate(R.layout.pager_photo_item, container, false) as ViewGroup)
+        if (!arguments!!.getBoolean(SHOULD_INIT_FRAGMENT)) {
+            return mView
+        }
+
+        mView.apply {
             subsampling_view.setOnClickListener { photoClicked() }
             gestures_view.setOnClickListener { photoClicked() }
             gif_view.setOnClickListener { photoClicked() }

app/src/main/kotlin/com/simplemobiletools/gallery/pro/fragments/VideoFragment.kt

@@ -28,10 +28,7 @@ import com.simplemobiletools.gallery.pro.R
 import com.simplemobiletools.gallery.pro.activities.PanoramaVideoActivity
 import com.simplemobiletools.gallery.pro.activities.VideoActivity
 import com.simplemobiletools.gallery.pro.extensions.*
-import com.simplemobiletools.gallery.pro.helpers.Config
+import com.simplemobiletools.gallery.pro.helpers.*
-import com.simplemobiletools.gallery.pro.helpers.MEDIUM
-import com.simplemobiletools.gallery.pro.helpers.MIN_SKIP_LENGTH
-import com.simplemobiletools.gallery.pro.helpers.PATH
 import com.simplemobiletools.gallery.pro.models.Medium
 import com.simplemobiletools.gallery.pro.views.MediaSideScroll
 import kotlinx.android.synthetic.main.bottom_video_time_holder.view.*
@@ -125,6 +122,10 @@ class VideoFragment : ViewPagerFragment(), TextureView.SurfaceTextureListener, S
             }
         }
 
+        if (!arguments!!.getBoolean(SHOULD_INIT_FRAGMENT)) {
+            return mView
+        }
+
         storeStateVariables()
         mMedium = arguments!!.getSerializable(MEDIUM) as Medium
         Glide.with(context!!).load(mMedium.path).into(mView.video_preview)

app/src/main/kotlin/com/simplemobiletools/gallery/pro/helpers/Constants.kt

@@ -119,6 +119,7 @@ const val GET_ANY_INTENT = "get_any_intent"
 const val SET_WALLPAPER_INTENT = "set_wallpaper_intent"
 const val IS_VIEW_INTENT = "is_view_intent"
 const val PICKED_PATHS = "picked_paths"
+const val SHOULD_INIT_FRAGMENT = "should_init_fragment"
 
 // rotations
 const val ROTATE_BY_SYSTEM_SETTING = 0