Document that WallpaperManager.getDrawable() can return null
Bug 30164766
Change-Id: Idc03a41ea3fab3772de4f24551765dff78eb6d7f
diff --git a/core/java/android/app/WallpaperManager.java b/core/java/android/app/WallpaperManager.java
index 53da4e3..2ee92a6 100644
--- a/core/java/android/app/WallpaperManager.java
+++ b/core/java/android/app/WallpaperManager.java
@@ -417,8 +417,14 @@
* This is returned as an
* abstract Drawable that you can install in a View to display whatever
* wallpaper the user has currently set.
+ * <p>
+ * This method can return null if there is no system wallpaper available, if
+ * wallpapers are not supported in the current user, or if the calling app is not
+ * permitted to access the system wallpaper.
*
- * @return Returns a Drawable object that will draw the wallpaper.
+ * @return Returns a Drawable object that will draw the system wallpaper,
+ * or {@code null} if no system wallpaper exists or if the calling application
+ * is not able to access the wallpaper.
*/
public Drawable getDrawable() {
Bitmap bm = sGlobals.peekWallpaperBitmap(mContext, true, FLAG_SYSTEM);