show the next/prev video player buttons only when appropriate

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

@@ -30,7 +30,6 @@ import java.io.File
 import java.io.FileInputStream
 
 open class PhotoVideoActivity : SimpleActivity(), ViewPagerFragment.FragmentListener {
-
     private var mMedium: Medium? = null
     private var mIsFullScreen = false
     private var mIsFromGallery = false
@@ -177,6 +176,10 @@ open class PhotoVideoActivity : SimpleActivity(), ViewPagerFragment.FragmentList
             val mimeType = getUriMimeType(mUri.toString(), newUri)
             Intent(applicationContext, VideoPlayerActivity::class.java).apply {
                 setDataAndType(newUri, mimeType)
+                if (intent.extras != null) {
+                    putExtras(intent.extras!!)
+                }
+
                 startActivity(this)
             }
         }
@@ -292,4 +295,6 @@ open class PhotoVideoActivity : SimpleActivity(), ViewPagerFragment.FragmentList
     override fun goToPrevItem() {}
 
     override fun goToNextItem() {}
+
+    override fun launchViewVideoIntent(path: String) {}
 }

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

@@ -161,8 +161,12 @@ open class VideoPlayerActivity : SimpleActivity(), SeekBar.OnSeekBarChangeListen
         video_curr_time.setOnClickListener { skip(false) }
         video_duration.setOnClickListener { skip(true) }
         video_toggle_play_pause.setOnClickListener { togglePlayPause() }
-        video_next_file.setOnClickListener { }
+
-        video_prev_file.setOnClickListener { }
+        video_next_file.beVisibleIf(intent.getBooleanExtra(SHOW_NEXT_ITEM, false))
+        video_next_file.setOnClickListener { handleNextFile() }
+
+        video_prev_file.beVisibleIf(intent.getBooleanExtra(SHOW_PREV_ITEM, false))
+        video_prev_file.setOnClickListener { handlePrevFile() }
 
         video_player_holder.setOnTouchListener { view, event ->
             handleEvent(event)
@@ -542,6 +546,14 @@ open class VideoPlayerActivity : SimpleActivity(), SeekBar.OnSeekBarChangeListen
         }
     }
 
+    private fun handleNextFile() {
+
+    }
+
+    private fun handlePrevFile() {
+
+    }
+
     private fun resetPlayWhenReady() {
         mExoPlayer?.playWhenReady = false
         mPlayWhenReadyHandler.removeCallbacksAndMessages(null)

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

@@ -32,6 +32,7 @@ import com.simplemobiletools.commons.dialogs.RenameItemDialog
 import com.simplemobiletools.commons.extensions.*
 import com.simplemobiletools.commons.helpers.*
 import com.simplemobiletools.commons.models.FileDirItem
+import com.simplemobiletools.gallery.pro.BuildConfig
 import com.simplemobiletools.gallery.pro.R
 import com.simplemobiletools.gallery.pro.adapters.MyPagerAdapter
 import com.simplemobiletools.gallery.pro.asynctasks.GetMediaAsynctask
@@ -53,6 +54,8 @@ import java.io.OutputStream
 import java.util.*
 
 class ViewPagerActivity : SimpleActivity(), ViewPager.OnPageChangeListener, ViewPagerFragment.FragmentListener {
+    private val REQUEST_VIEW_VIDEO = 1
+
     private var mPath = ""
     private var mDirectory = ""
     private var mIsFullScreen = false
@@ -917,6 +920,8 @@ class ViewPagerActivity : SimpleActivity(), ViewPager.OnPageChangeListener, View
             if (resultCode == Activity.RESULT_OK) {
                 toast(R.string.wallpaper_set_successfully)
             }
+        } else if (requestCode == REQUEST_VIEW_VIDEO) {
+
         }
         super.onActivityResult(requestCode, resultCode, resultData)
     }
@@ -1098,6 +1103,34 @@ class ViewPagerActivity : SimpleActivity(), ViewPager.OnPageChangeListener, View
         checkOrientation()
     }
 
+    override fun launchViewVideoIntent(path: String) {
+        Thread {
+            val newUri = getFinalUriFromPath(path, BuildConfig.APPLICATION_ID) ?: return@Thread
+            val mimeType = getUriMimeType(path, newUri)
+            Intent().apply {
+                action = Intent.ACTION_VIEW
+                setDataAndType(newUri, mimeType)
+                addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+                putExtra(IS_FROM_GALLERY, true)
+                putExtra(REAL_FILE_PATH, path)
+                putExtra(SHOW_PREV_ITEM, view_pager.currentItem != 0)
+                putExtra(SHOW_NEXT_ITEM, view_pager.currentItem != mMediaFiles.size - 1)
+
+                if (resolveActivity(packageManager) != null) {
+                    try {
+                        startActivityForResult(this, REQUEST_VIEW_VIDEO)
+                    } catch (e: NullPointerException) {
+                        showErrorToast(e)
+                    }
+                } else {
+                    if (!tryGenericMimeType(this, mimeType, newUri)) {
+                        toast(R.string.no_app_found)
+                    }
+                }
+            }
+        }.start()
+    }
+
     private fun checkSystemUI() {
         if (mIsFullScreen) {
             hideSystemUI(true)

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

@@ -129,7 +129,7 @@ class VideoFragment : ViewPagerFragment() {
     }
 
     private fun launchVideoPlayer() {
-        activity!!.openPath(mMedium.path, false)
+        listener?.launchViewVideoIntent(mMedium.path)
     }
 
     private fun toggleFullscreen() {

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

@@ -28,6 +28,8 @@ abstract class ViewPagerFragment : Fragment() {
         fun goToPrevItem()
 
         fun goToNextItem()
+
+        fun launchViewVideoIntent(path: String)
     }
 
     fun getMediumExtendedDetails(medium: Medium): String {

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

@@ -92,6 +92,8 @@ const val FAVORITES = "favorites"
 const val RECYCLE_BIN = "recycle_bin"
 const val SHOW_FAVORITES = "show_favorites"
 const val SHOW_RECYCLE_BIN = "show_recycle_bin"
+const val SHOW_NEXT_ITEM = "show_next_item"
+const val SHOW_PREV_ITEM = "show_prev_item"
 const val MAX_COLUMN_COUNT = 20
 const val SHOW_TEMP_HIDDEN_DURATION = 300000L
 const val CLICK_MAX_DURATION = 150

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

@@ -16,7 +16,8 @@
         android:layout_marginTop="@dimen/activity_margin"
         android:background="?attr/selectableItemBackgroundBorderless"
         android:padding="@dimen/normal_margin"
-        android:src="@drawable/ic_prev_outline"/>
+        android:src="@drawable/ic_prev_outline"
+        android:visibility="invisible"/>
 
     <ImageView
         android:id="@+id/video_toggle_play_pause"
@@ -38,7 +39,8 @@
         android:layout_marginEnd="@dimen/small_margin"
         android:background="?attr/selectableItemBackgroundBorderless"
         android:padding="@dimen/normal_margin"
-        android:src="@drawable/ic_next_outline"/>
+        android:src="@drawable/ic_next_outline"
+        android:visibility="invisible"/>
 
     <TextView
         android:id="@+id/video_curr_time"