Add method to set activity header subtitle

Author: pranavpandey

dynamic-support/src/main/java/com/pranavpandey/android/dynamic/support/activity/DynamicActivity.java

@@ -956,6 +956,16 @@ public void onAddHeader(@Nullable View view) {
         }
     }
 
+    /**
+     * Try to set header subtitle if added.
+     *
+     * @param subtitle The subtitle to be set.
+     */
+    public void setHeaderSubtitle(@Nullable CharSequence subtitle) {
+        DynamicMotion.getInstance().beginDelayedTransition(getFrameHeader());
+        Dynamic.set(findViewById(R.id.ads_header_appbar_subtitle), subtitle);
+    }
+
     /**
      * Set the visibility of app bar progress.
      *

dynamic-support/src/main/java/com/pranavpandey/android/dynamic/support/permission/activity/DynamicPermissionsActivity.java

@@ -130,9 +130,8 @@ public void updateSubtitle(@Nullable String[] permissions) {
             return;
         }
 
-        Dynamic.set(findViewById(R.id.ads_header_appbar_subtitle),
-                getString(permissions.length == 1 ? R.string.ads_permissions_subtitle_single
-                        : R.string.ads_permissions_subtitle));
+        setHeaderSubtitle(getString(permissions.length == 1
+                ? R.string.ads_permissions_subtitle_single : R.string.ads_permissions_subtitle));
     }
 
     @Override