remeasure the screen if the width and height are set to 0 at fullscreen view

app/build.gradle

@@ -47,7 +47,7 @@ ext {
 }
 
 dependencies {
-    implementation 'com.simplemobiletools:commons:4.6.0'
+    implementation 'com.simplemobiletools:commons:4.6.3'
     implementation 'com.theartofdev.edmodo:android-image-cropper:2.7.0'
     implementation 'com.android.support:multidex:1.0.3'
     implementation 'it.sephiroth.android.exif:library:1.0.1'

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

@@ -2,6 +2,7 @@ package com.simplemobiletools.gallery.activities
 
 import android.animation.Animator
 import android.animation.ValueAnimator
+import android.annotation.SuppressLint
 import android.annotation.TargetApi
 import android.app.Activity
 import android.content.Intent
@@ -965,9 +966,10 @@ class ViewPagerActivity : SimpleActivity(), ViewPager.OnPageChangeListener, View
         initBottomActionsLayout()
     }
 
+    @SuppressLint("NewApi")
     private fun measureScreen() {
         val metrics = DisplayMetrics()
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
+        if (isJellyBean1Plus()) {
             windowManager.defaultDisplay.getRealMetrics(metrics)
             screenWidth = metrics.widthPixels
             screenHeight = metrics.heightPixels

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

@@ -1,5 +1,6 @@
 package com.simplemobiletools.gallery.fragments
 
+import android.annotation.SuppressLint
 import android.content.Intent
 import android.content.res.Configuration
 import android.graphics.Bitmap
@@ -11,6 +12,7 @@ import android.media.ExifInterface.*
 import android.net.Uri
 import android.os.Bundle
 import android.os.Handler
+import android.util.DisplayMetrics
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
@@ -19,6 +21,7 @@ import com.davemorrissey.labs.subscaleview.ImageSource
 import com.davemorrissey.labs.subscaleview.SubsamplingScaleImageView
 import com.simplemobiletools.commons.extensions.*
 import com.simplemobiletools.commons.helpers.OTG_PATH
+import com.simplemobiletools.commons.helpers.isJellyBean1Plus
 import com.simplemobiletools.commons.helpers.isLollipopPlus
 import com.simplemobiletools.gallery.R
 import com.simplemobiletools.gallery.activities.PanoramaActivity
@@ -39,7 +42,7 @@ import java.io.FileOutputStream
 
 class PhotoFragment : ViewPagerFragment() {
     private val DEFAULT_DOUBLE_TAP_ZOOM = 2f
-    private val ZOOMABLE_VIEW_LOAD_DELAY = 500L
+    private val ZOOMABLE_VIEW_LOAD_DELAY = 300L
 
     private var isFragmentVisible = false
     private var isFullscreen = false
@@ -78,6 +81,10 @@ class PhotoFragment : ViewPagerFragment() {
             }
         }
 
+        if (ViewPagerActivity.screenWidth == 0 || ViewPagerActivity.screenHeight == 0) {
+            measureScreen()
+        }
+
         storeStateVariables()
         if (!isFragmentVisible && activity is PhotoActivity) {
             isFragmentVisible = true
@@ -167,6 +174,20 @@ class PhotoFragment : ViewPagerFragment() {
         }
     }
 
+    @SuppressLint("NewApi")
+    private fun measureScreen() {
+        val metrics = DisplayMetrics()
+        if (isJellyBean1Plus()) {
+            activity!!.windowManager.defaultDisplay.getRealMetrics(metrics)
+            ViewPagerActivity.screenWidth = metrics.widthPixels
+            ViewPagerActivity.screenHeight = metrics.heightPixels
+        } else {
+            activity!!.windowManager.defaultDisplay.getMetrics(metrics)
+            ViewPagerActivity.screenWidth = metrics.widthPixels
+            ViewPagerActivity.screenHeight = metrics.heightPixels
+        }
+    }
+
     private fun gifFragmentVisibilityChanged(isVisible: Boolean) {
         if (isVisible) {
             gifDrawable?.start()