Add uses-feature to the manifest.
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index bcf1dce..22d2533 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -21,6 +21,8 @@
     xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.android.wallpaper">
 
+    <uses-feature android:name="android.software.live_wallpaper" />
+
     <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
     <uses-permission android:name="android.permission.CAMERA" />