1 files changed, 13 insertions, 0 deletions
diff --git a/core/src/main/java/com/android/volley/toolbox/Threads.java b/core/src/main/java/com/android/volley/toolbox/Threads.java
new file mode 100644
index 0000000..66c3e41
--- /dev/null
+++ b/core/src/main/java/com/android/volley/toolbox/Threads.java
@@ -0,0 +1,13 @@
+package com.android.volley.toolbox;
+
+import android.os.Looper;
+
+final class Threads {
+    private Threads() {}
+
+    static void throwIfNotOnMainThread() {
+        if (Looper.myLooper() != Looper.getMainLooper()) {
+            throw new IllegalStateException("Must be invoked from the main thread.");
+        }
+    }
+}