add a pickAlbumActivity for picking copy destination

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

@@ -0,0 +1,53 @@
+package com.simplemobiletools.gallery.activities
+
+import android.os.Bundle
+import android.view.View
+import android.widget.AdapterView
+import com.simplemobiletools.gallery.R
+import com.simplemobiletools.gallery.Utils
+import com.simplemobiletools.gallery.adapters.DirectoryAdapter
+import com.simplemobiletools.gallery.asynctasks.GetDirectoriesAsynctask
+import com.simplemobiletools.gallery.models.Directory
+import kotlinx.android.synthetic.main.activity_main.*
+import java.util.*
+
+class PickAlbumActivity : SimpleActivity(), AdapterView.OnItemClickListener, GetDirectoriesAsynctask.GetDirectoriesListener {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+        mDirs = ArrayList<Directory>()
+    }
+
+    override fun onResume() {
+        super.onResume()
+        tryloadGallery()
+    }
+
+    private fun tryloadGallery() {
+        if (Utils.hasStoragePermission(applicationContext)) {
+            getDirectories()
+        } else {
+            Utils.showToast(applicationContext, R.string.no_permissions)
+        }
+    }
+
+    private fun getDirectories() {
+        GetDirectoriesAsynctask(applicationContext, false, false, ArrayList<String>(), this).execute()
+    }
+
+    override fun onItemClick(parent: AdapterView<*>, view: View, position: Int, id: Long) {
+        val path = mDirs!![position].path
+    }
+
+    override fun gotDirectories(dirs: ArrayList<Directory>) {
+        mDirs = dirs
+
+        val adapter = DirectoryAdapter(this, dirs)
+        directories_grid.adapter = adapter
+        directories_grid.onItemClickListener = this
+    }
+
+    companion object {
+        private var mDirs: MutableList<Directory>? = null
+    }
+}