try prefetching directories after install, before first app launch

app/src/main/AndroidManifest.xml

@@ -174,5 +174,13 @@
                 android:name="android.support.FILE_PROVIDER_PATHS"
                 android:resource="@xml/provider_paths"/>
         </provider>
+
+        <receiver
+            android:name=".receivers.InstallReceiver"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="com.android.vending.INSTALL_REFERRER"/>
+            </intent-filter>
+        </receiver>
     </application>
 </manifest>

app/src/main/kotlin/com/simplemobiletools/gallery/asynctasks/GetDirectoriesAsynctask.kt

@@ -20,6 +20,9 @@ class GetDirectoriesAsynctask(val context: Context, val isPickVideo: Boolean, va
     var shouldStop = false
 
     override fun doInBackground(vararg params: Void): ArrayList<Directory> {
+        if (!context.hasWriteStoragePermission())
+            return ArrayList()
+
         val media = ArrayList<Medium>()
         val showMedia = config.showMedia
         val fileSorting = config.fileSorting

app/src/main/kotlin/com/simplemobiletools/gallery/receivers/InstallReceiver.kt

@@ -0,0 +1,16 @@
+package com.simplemobiletools.gallery.receivers
+
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import com.google.gson.Gson
+import com.simplemobiletools.gallery.asynctasks.GetDirectoriesAsynctask
+import com.simplemobiletools.gallery.extensions.config
+
+class InstallReceiver : BroadcastReceiver() {
+    override fun onReceive(context: Context, intent: Intent) {
+        GetDirectoriesAsynctask(context, false, false) {
+            context.config.directories = Gson().toJson(it)
+        }.execute()
+    }
+}