1 package com.android.volley.toolbox; 2 3 import android.os.Looper; 4 5 final class Threads { Threads()6 private Threads() {} 7 throwIfNotOnMainThread()8 static void throwIfNotOnMainThread() { 9 if (Looper.myLooper() != Looper.getMainLooper()) { 10 throw new IllegalStateException("Must be invoked from the main thread."); 11 } 12 } 13 } 14