convert mediaadapter to kotlin

app/src/main/kotlin/com/simplemobiletools/gallery/adapters/MediaAdapter.kt

@@ -0,0 +1,72 @@
+package com.simplemobiletools.gallery.adapters
+
+import android.content.Context
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.BaseAdapter
+import android.widget.ImageView
+import com.bumptech.glide.Glide
+import com.bumptech.glide.load.engine.DiskCacheStrategy
+import com.bumptech.glide.signature.StringSignature
+import com.simplemobiletools.gallery.R
+import com.simplemobiletools.gallery.models.Medium
+import kotlinx.android.synthetic.main.photo_video_item.view.*
+import kotlinx.android.synthetic.main.photo_video_tmb.view.*
+
+class MediaAdapter(private val mContext: Context, private val mMedia: MutableList<Medium>) : BaseAdapter() {
+    private val mInflater: LayoutInflater
+
+    init {
+        mInflater = mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
+    }
+
+    override fun getView(position: Int, view: View?, parent: ViewGroup): View {
+        var convertView = view
+        val medium = mMedia[position]
+        val viewHolder: ViewHolder
+        if (convertView == null) {
+            convertView = mInflater.inflate(R.layout.photo_video_item, parent, false)
+            viewHolder = ViewHolder(convertView)
+            convertView!!.tag = viewHolder
+        } else {
+            viewHolder = convertView.tag as ViewHolder
+        }
+
+        viewHolder.playOutline.visibility = if (medium.isVideo) View.VISIBLE else View.GONE
+
+        val path = medium.path
+        val timestampSignature = StringSignature(medium.timestamp.toString())
+        if (medium.isGif) {
+            Glide.with(mContext).load(path).asGif().diskCacheStrategy(DiskCacheStrategy.NONE).signature(timestampSignature).into(viewHolder.photoThumbnail)
+        } else {
+            Glide.with(mContext).load(path).diskCacheStrategy(DiskCacheStrategy.NONE).signature(timestampSignature)
+                    .placeholder(R.color.tmb_background).centerCrop().crossFade().into(viewHolder.photoThumbnail)
+        }
+
+        return convertView
+    }
+
+    override fun getCount(): Int {
+        return mMedia.size
+    }
+
+    override fun getItem(position: Int): Any {
+        return mMedia[position]
+    }
+
+    override fun getItemId(position: Int): Long {
+        return 0
+    }
+
+    fun updateItems(newPhotos: List<Medium>) {
+        mMedia.clear()
+        mMedia.addAll(newPhotos)
+        notifyDataSetChanged()
+    }
+
+    internal class ViewHolder(view: View) {
+        val photoThumbnail: ImageView = view.medium_thumbnail
+        val playOutline: View = view.play_outline
+    }
+}