diff --git a/core/src/main/java/android/content/res/XResources.java b/core/src/main/java/android/content/res/XResources.java
index fd89bfec..37a63af5 100644
--- a/core/src/main/java/android/content/res/XResources.java
+++ b/core/src/main/java/android/content/res/XResources.java
@@ -47,6 +47,7 @@ import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 
+import androidx.annotation.NonNull;
 import androidx.annotation.RequiresApi;
 
 import org.xmlpull.v1.XmlPullParser;
@@ -168,6 +169,8 @@ public class XResources extends XposedResources {
 	/**
 	 * Returns the name of the package that these resources belong to, or "android" for system resources.
 	 */
+	@NonNull
+	@Override
 	public String getPackageName() {
 		return mPackageName;
 	}
diff --git a/libxposed/api/src/main/java/io/github/libxposed/XposedResources.java b/libxposed/api/src/main/java/io/github/libxposed/XposedResources.java
index 01bb1311..ef8902da 100644
--- a/libxposed/api/src/main/java/io/github/libxposed/XposedResources.java
+++ b/libxposed/api/src/main/java/io/github/libxposed/XposedResources.java
@@ -5,7 +5,7 @@ import android.content.res.Configuration;
 import android.content.res.Resources;
 import android.util.DisplayMetrics;
 
-public abstract class XposedResources extends Resources {
+public abstract class XposedResources extends Resources implements XposedResourcesInterface {
     public XposedResources(AssetManager assets, DisplayMetrics metrics, Configuration config) {
         super(assets, metrics, config);
     }
diff --git a/libxposed/api/src/main/java/io/github/libxposed/XposedResourcesInterface.java b/libxposed/api/src/main/java/io/github/libxposed/XposedResourcesInterface.java
new file mode 100644
index 00000000..a19def9a
--- /dev/null
+++ b/libxposed/api/src/main/java/io/github/libxposed/XposedResourcesInterface.java
@@ -0,0 +1,7 @@
+package io.github.libxposed;
+
+import androidx.annotation.NonNull;
+
+public interface XposedResourcesInterface {
+    @NonNull String getPackageName();
+}