add sorting button to the menu

app/src/main/java/com/simplemobiletools/gallery/activities/MainActivity.java

@@ -102,6 +102,8 @@ public class MainActivity extends SimpleActivity
     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
         switch (item.getItemId()) {
+            case R.id.sort:
+                return true;
             case R.id.camera:
                 startActivity(new Intent(MediaStore.INTENT_ACTION_STILL_IMAGE_CAMERA));
                 return true;

app/src/main/java/com/simplemobiletools/gallery/activities/MediaActivity.java

@@ -124,6 +124,22 @@ public class MediaActivity extends SimpleActivity
         setTitle(dirName);
     }
 
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        getMenuInflater().inflate(R.menu.menu_media, menu);
+        return true;
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+            case R.id.sort:
+                return true;
+            default:
+                return super.onOptionsItemSelected(item);
+        }
+    }
+
     private void deleteDirectoryIfEmpty() {
         final File file = new File(mPath);
         if (file.isDirectory() && file.listFiles().length == 0) {
@@ -364,7 +380,7 @@ public class MediaActivity extends SimpleActivity
     @Override
     public boolean onCreateActionMode(ActionMode mode, Menu menu) {
         final MenuInflater inflater = mode.getMenuInflater();
-        inflater.inflate(R.menu.media_menu, menu);
+        inflater.inflate(R.menu.cab_media, menu);
         return true;
     }
 

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

@@ -1,6 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
 <menu xmlns:android="http://schemas.android.com/apk/res/android"
       xmlns:app="http://schemas.android.com/apk/res-auto">
+    <item
+        android:id="@+id/sort"
+        android:icon="@mipmap/sort"
+        android:title="@string/sort_by"
+        app:showAsAction="ifRoom"/>
     <item
         android:id="@+id/camera"
         android:icon="@mipmap/camera"

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

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+      xmlns:app="http://schemas.android.com/apk/res-auto">
+    <item
+        android:id="@+id/sort"
+        android:icon="@mipmap/sort"
+        android:title="@string/sort_by"
+        app:showAsAction="ifRoom"/>
+</menu>