code: void stop() {
  		if (!configuration.customExecutor) {
  			((ExecutorService) taskExecutor).shutdownNow();
  		}
  		if (!configuration.customExecutorForCachedImages) {
  			((ExecutorService) taskExecutorForCachedImages).shutdownNow();
  		}
  
  		cacheKeysForImageAwares.clear();
  		uriLocks.clear();
  	}
docs: Stops engine, cancels all running and scheduled display image tasks. Clears internal data.
  <br />
  <b>NOTE:</b> This method doesn't shutdown
  {@linkplain com.nostra13.universalimageloader.core.ImageLoaderConfiguration.Builder#taskExecutor(java.util.concurrent.Executor)
  custom task executors} if you set them.