What happens to the execution flow when the queue remains empty in the context of Looper?

In Android, when the message queue (MessageQueue) in the Looper is empty, the execution thread does not terminate or actively idle. Instead, the Looper calls the loop() method, which blocks and waits for new messages or events in the queue. Thus, the thread enters a waiting (blocking) state, conserving resources, and only wakes up when new messages arrive for processing. This allows efficient handling of asynchronous tasks in a single thread, such as the main UI thread.