implement the Go home and Set home buttons

app/src/main/kotlin/com/simplemobiletools/filemanager/Config.kt

@@ -1,7 +1,9 @@
 package com.simplemobiletools.filemanager
 
 import android.content.Context
+import com.simplemobiletools.commons.extensions.getInternalStoragePath
 import com.simplemobiletools.commons.helpers.BaseConfig
+import java.io.File
 
 class Config(context: Context) : BaseConfig(context) {
     companion object {
@@ -11,4 +13,14 @@ class Config(context: Context) : BaseConfig(context) {
     var showHidden: Boolean
         get() = prefs.getBoolean(SHOW_HIDDEN, false)
         set(show) = prefs.edit().putBoolean(SHOW_HIDDEN, show).apply()
+
+    var homeFolder: String
+        get(): String {
+            var home = prefs.getString(HOME_FOLDER, "")
+            if (home.isEmpty() || !File(home).exists() || !File(home).isDirectory) {
+                home = context.getInternalStoragePath()
+            }
+            return home
+        }
+        set(homeFolder) = prefs.edit().putString(HOME_FOLDER, homeFolder).apply()
 }

app/src/main/kotlin/com/simplemobiletools/filemanager/Constants.kt

@@ -5,3 +5,4 @@ val SCROLL_STATE = "scroll_state"
 
 // shared preferences
 val SHOW_HIDDEN = "show_hidden"
+val HOME_FOLDER = "home_folder"

app/src/main/kotlin/com/simplemobiletools/filemanager/activities/MainActivity.kt

@@ -44,6 +44,7 @@ class MainActivity : SimpleActivity(), ItemsFragment.ItemInteractionListener, Br
         breadcrumbs.setListener(this)
         tryInitFileManager()
         storeStoragePaths()
+        checkWhatsNewDialog()
     }
 
     override fun onResume() {
@@ -69,7 +70,6 @@ class MainActivity : SimpleActivity(), ItemsFragment.ItemInteractionListener, Br
     private fun tryInitFileManager() {
         if (hasWriteStoragePermission()) {
             initRootFileManager()
-            checkWhatsNewDialog()
         } else {
             ActivityCompat.requestPermissions(this, arrayOf(Manifest.permission.WRITE_EXTERNAL_STORAGE), STORAGE_PERMISSION)
         }
@@ -116,13 +116,16 @@ class MainActivity : SimpleActivity(), ItemsFragment.ItemInteractionListener, Br
     }
 
     private fun goHome() {
-
+        openPath(config.homeFolder)
     }
 
     private fun setAsHome() {
-
+        config.homeFolder = getCurrenPath()
+        toast(R.string.home_folder_updated)
     }
 
+    private fun getCurrenPath() = (breadcrumbs.getChildAt(breadcrumbs.childCount - 1).tag as FileDirItem).path.trimEnd('/')
+
     private fun launchAbout() {
         startAboutActivity(R.string.app_name, LICENSE_KOTLIN or LICENSE_MULTISELECT, BuildConfig.VERSION_NAME)
     }