Add scan button to folder toolbar

app/src/main/java/com/kabouzeid/gramophone/ui/fragments/mainactivity/folders/FoldersFragment.java

@@ -265,6 +265,12 @@ public class FoldersFragment extends AbsMainActivityFragment implements MainActi
             case R.id.action_go_to_start_directory:
                 setCrumb(new BreadCrumbLayout.Crumb(tryGetCanonicalFile(PreferenceUtil.getInstance(getActivity()).getStartDirectory())), true);
                 return true;
+            case R.id.action_scan:
+                BreadCrumbLayout.Crumb crumb = getActiveCrumb();
+                if (crumb != null) {
+                    new ListPathsAsyncTask(getActivity(), paths -> scanPaths(paths)).execute(new ListPathsAsyncTask.LoadingInfo(crumb.getFile(), getFileFilter()));
+                }
+                return true;
         }
         return super.onOptionsItemSelected(item);
     }

app/src/main/res/drawable/ic_scanner_white_24dp.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android" android:height="24dp" android:viewportHeight="24.0" android:viewportWidth="24.0" android:width="24dp">
+    <path android:fillColor="#FFFFFF" android:pathData="M19.8,10.7L4.2,5l-0.7,1.9L17.6,12L5,12c-1.1,0 -2,0.9 -2,2v4c0,1.1 0.9,2 2,2h14c1.1,0 2,-0.9 2,-2v-5.5c0,-0.8 -0.5,-1.6 -1.2,-1.8zM7,17L5,17v-2h2v2zM19,17L9,17v-2h10v2z"/>
+</vector>

app/src/main/res/menu/menu_folders.xml

@@ -2,6 +2,12 @@
 <menu xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto">
 
+    <item
+        android:id="@+id/action_scan"
+        android:icon="@drawable/ic_scanner_white_24dp"
+        android:title="@string/action_scan_directory"
+        app:showAsAction="ifRoom" />
+
     <item
         android:id="@+id/action_go_to_start_directory"
         android:icon="@drawable/ic_bookmark_music_white_24dp"

app/src/main/res/values/strings.xml

@@ -295,4 +295,5 @@
     <string name="library_categories">Library categories</string>
     <string name="pref_summary_library_categories">Configure visibility and order of library categories.</string>
     <string name="you_have_to_select_at_least_one_category">You have to select at least one category.</string>
+    <string name="action_scan_directory">Scan directory</string>
 </resources>