adding the initial code for VideoPlayerActivity used for video playing

app/src/main/AndroidManifest.xml

@@ -122,6 +122,10 @@
             android:name=".activities.PhotoVideoActivity"
             android:configChanges="orientation|keyboardHidden|screenSize"/>
 
+        <activity
+            android:name=".activities.VideoPlayerActivity"
+            android:configChanges="orientation|keyboardHidden|screenSize"/>
+
         <activity
             android:name=".activities.PanoramaPhotoActivity"
             android:configChanges="orientation|keyboardHidden|screenSize"

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

@@ -0,0 +1,131 @@
+package com.simplemobiletools.gallery.pro.activities
+
+import android.content.pm.ActivityInfo
+import android.graphics.Color
+import android.graphics.drawable.ColorDrawable
+import android.net.Uri
+import android.os.Bundle
+import android.view.Menu
+import android.view.MenuItem
+import android.view.View
+import android.view.WindowManager
+import com.simplemobiletools.commons.extensions.getFilenameFromUri
+import com.simplemobiletools.commons.extensions.getParentPath
+import com.simplemobiletools.commons.extensions.toast
+import com.simplemobiletools.commons.helpers.PERMISSION_WRITE_STORAGE
+import com.simplemobiletools.commons.helpers.isPiePlus
+import com.simplemobiletools.gallery.pro.R
+import com.simplemobiletools.gallery.pro.extensions.*
+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.TYPE_VIDEOS
+import com.simplemobiletools.gallery.pro.models.Medium
+import kotlinx.android.synthetic.main.activity_video_player.*
+import java.io.File
+
+open class VideoPlayerActivity : SimpleActivity(), ViewPagerFragment.FragmentListener {
+
+    private var mMedium: Medium? = null
+    private var mIsFullScreen = false
+    private var mCurrentOrientation = ActivityInfo.SCREEN_ORIENTATION_SENSOR
+    private var mFragment: ViewPagerFragment? = null
+    private var mUri: Uri? = null
+
+    public override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_video_player)
+
+        handlePermission(PERMISSION_WRITE_STORAGE) {
+            if (it) {
+                checkIntent(savedInstanceState)
+            } else {
+                toast(R.string.no_storage_permissions)
+                finish()
+            }
+        }
+    }
+
+    override fun onResume() {
+        super.onResume()
+        top_shadow.layoutParams.height = statusBarHeight + actionBarHeight
+        supportActionBar?.setBackgroundDrawable(ColorDrawable(Color.TRANSPARENT))
+        window.statusBarColor = Color.TRANSPARENT
+        window.navigationBarColor = Color.TRANSPARENT
+    }
+
+    private fun checkIntent(savedInstanceState: Bundle? = null) {
+        mUri = intent.data ?: return
+        val filename = getFilenameFromUri(mUri!!)
+
+        if (isPiePlus()) {
+            window.attributes.layoutInDisplayCutoutMode = WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_SHORT_EDGES
+            window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS)
+        }
+
+        showSystemUI(true)
+        val bundle = Bundle()
+        val file = File(mUri.toString())
+        val type = TYPE_VIDEOS
+
+        mMedium = Medium(null, filename, mUri.toString(), mUri!!.path.getParentPath(), 0, 0, file.length(), type, 0, false, 0L)
+        supportActionBar?.title = mMedium!!.name
+        bundle.putSerializable(MEDIUM, mMedium)
+
+        if (savedInstanceState == null) {
+            mFragment = VideoFragment()
+            mFragment!!.listener = this
+            mFragment!!.arguments = bundle
+            supportFragmentManager.beginTransaction().replace(R.id.fragment_placeholder, mFragment!!).commit()
+        }
+
+        if (config.blackBackground) {
+            fragment_holder.background = ColorDrawable(Color.BLACK)
+        }
+
+        window.decorView.setOnSystemUiVisibilityChangeListener { visibility ->
+            val isFullscreen = visibility and View.SYSTEM_UI_FLAG_FULLSCREEN != 0
+            mFragment?.fullscreenToggled(isFullscreen)
+        }
+    }
+
+    override fun onCreateOptionsMenu(menu: Menu): Boolean {
+        menuInflater.inflate(R.menu.menu_video_player, menu)
+        return true
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
+        if (mMedium == null || mUri == null) {
+            return true
+        }
+
+        when (item.itemId) {
+            R.id.menu_force_portrait -> forceOrientation(true)
+            R.id.menu_force_landscape -> forceOrientation(false)
+            else -> return super.onOptionsItemSelected(item)
+        }
+        return true
+    }
+
+    private fun forceOrientation(portrait: Boolean) {
+
+    }
+
+    override fun fragmentClicked() {
+        mIsFullScreen = !mIsFullScreen
+        if (mIsFullScreen) {
+            hideSystemUI(true)
+        } else {
+            showSystemUI(true)
+        }
+
+        val newAlpha = if (mIsFullScreen) 0f else 1f
+        top_shadow.animate().alpha(newAlpha).start()
+    }
+
+    override fun videoEnded() = false
+
+    override fun goToPrevItem() {}
+
+    override fun goToNextItem() {}
+}

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

@@ -129,10 +129,6 @@ class ViewPagerActivity : SimpleActivity(), ViewPager.OnPageChangeListener, View
         setupRotation()
         invalidateOptionsMenu()
 
-        if (config.blackBackground) {
-            updateStatusbarColor(Color.BLACK)
-        }
-
         supportActionBar?.setBackgroundDrawable(ColorDrawable(Color.TRANSPARENT))
         window.statusBarColor = Color.TRANSPARENT
     }

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

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/fragment_holder"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <FrameLayout
+        android:id="@+id/fragment_placeholder"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"/>
+
+    <ImageView
+        android:id="@+id/top_shadow"
+        android:layout_width="match_parent"
+        android:layout_height="@dimen/default_status_action_height"
+        android:background="@drawable/gradient_background_flipped"/>
+
+</RelativeLayout>

app/src/main/res/menu/menu_video_player.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+      xmlns:app="http://schemas.android.com/apk/res-auto">
+    <item
+        android:id="@+id/menu_force_portrait"
+        android:icon="@drawable/ic_orientation_portrait"
+        android:title="@string/force_portrait"
+        app:showAsAction="ifRoom"/>
+    <item
+        android:id="@+id/menu_force_landscape"
+        android:icon="@drawable/ic_orientation_landscape"
+        android:title="@string/force_landscape"
+        app:showAsAction="ifRoom"/>
+    <item
+        android:id="@+id/menu_share"
+        android:icon="@drawable/ic_share"
+        android:title="@string/share"
+        app:showAsAction="ifRoom"/>
+    <item
+        android:id="@+id/menu_open_with"
+        android:title="@string/open_with"
+        app:showAsAction="never"/>
+</menu>