show a "Set as Wallpaper" menu item at images

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

@@ -134,6 +134,7 @@ public class ViewPagerActivity extends SimpleActivity
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         getMenuInflater().inflate(R.menu.viewpager_menu, menu);
+        menu.findItem(R.id.menu_set_as_wallpaper).setVisible(getCurrentMedium().isImage());
         return true;
     }
 
@@ -141,6 +142,8 @@ public class ViewPagerActivity extends SimpleActivity
     public boolean onOptionsItemSelected(MenuItem item) {
         deleteFile();
         switch (item.getItemId()) {
+            case R.id.menu_set_as_wallpaper:
+                return true;
             case R.id.menu_share:
                 shareMedium();
                 return true;
@@ -385,6 +388,7 @@ public class ViewPagerActivity extends SimpleActivity
     public void onPageSelected(int position) {
         updateActionbarTitle();
         mPos = position;
+        supportInvalidateOptionsMenu();
     }
 
     @Override

app/src/main/java/com/simplemobiletools/gallery/models/Medium.java

@@ -39,6 +39,10 @@ public class Medium implements Serializable, Comparable {
         return getPath().endsWith(".gif");
     }
 
+    public boolean isImage() {
+        return !isGif() && !getIsVideo();
+    }
+
     @Override
     public int compareTo(Object object) {
         final Medium medium = (Medium) object;

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

@@ -1,6 +1,10 @@
 <?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/menu_set_as_wallpaper"
+        android:title="@string/set_as_wallpaper"
+        app:showAsAction="never"/>
     <item
         android:id="@+id/menu_edit"
         android:icon="@mipmap/edit"

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

@@ -28,6 +28,7 @@
     <string name="descending">Descending</string>
     <string name="ok">OK</string>
     <string name="cancel">Cancel</string>
+    <string name="set_as_wallpaper">Set as Wallpaper</string>
 
     <plurals name="folders_deleted">
         <item quantity="one">1 cartella eliminata</item>

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

@@ -28,6 +28,7 @@
     <string name="descending">Descending</string>
     <string name="ok">OK</string>
     <string name="cancel">Cancel</string>
+    <string name="set_as_wallpaper">Set as Wallpaper</string>
 
     <plurals name="folders_deleted">
         <item quantity="one">1 フォルダーを削除しました</item>

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

@@ -28,6 +28,7 @@
     <string name="descending">Descending</string>
     <string name="ok">OK</string>
     <string name="cancel">Cancel</string>
+    <string name="set_as_wallpaper">Set as Wallpaper</string>
 
     <plurals name="folders_deleted">
         <item quantity="one">1 mapp borttagen</item>

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

@@ -28,6 +28,7 @@
     <string name="descending">Descending</string>
     <string name="ok">OK</string>
     <string name="cancel">Cancel</string>
+    <string name="set_as_wallpaper">Set as Wallpaper</string>
 
     <plurals name="folders_deleted">
         <item quantity="one">1 folder deleted</item>