Thread.sleep()是java提供的函数。在调用该函数的过程中可能会发生InterruptedException异常。
SystemClock.sleep()是android提供的函数。在调用该函数的过程中不会发生InterruptedException异常，中断事件将要被延迟直到下一个中断事件。
Use this function for delays if you do not useThread.interrupt(), as it will preserve the interrupted state of the thread.
SystemClock.sleep(long ms)源码
/**
* Waits a given number of milliseconds (of uptimeMillis) before returning.
* Similar to {@link java.lang.Thread#sleep(long)}, but does not throw
* {@link InterruptedException}; {@link Thread#interrupt()} events are
* deferred until the next interruptible operation. Does not return until
* at least the specified number of milliseconds has elapsed.
*
* @param ms to sleep before returning, in milliseconds of uptime.
*/
public static void sleep(long ms)
{
long start = uptimeMillis();
long duration = ms;
boolean interrupted = false;
do {
try {
Thread.sleep(duration);
}
catch (InterruptedException e) {
interrupted = true;
}
duration = start + ms - uptimeMillis();
} while (duration > 0);
if (interrupted) {
// Important: we don't want to quietly eat an interrupt() event,
// so we make sure to re-interrupt the thread so that the next
// call to Thread.sleep() or Object.wait() will be interrupted.
Thread.currentThread().interrupt();
}
}有源码可知SystemClock.sleep还是调用Thread.sleep
/**
* Causes the currently executing thread to sleep (temporarily cease
* execution) for the specified number of milliseconds, subject to
* the precision and accuracy of system timers and schedulers. The thread
* does not lose ownership of any monitors.
*
* @param millis
* the length of time to sleep in milliseconds
*
* @throws IllegalArgumentException
* if the value of {@code millis} is negative
*
* @throws InterruptedException
* if any thread has interrupted the current thread. The
* <i>interrupted status</i> of the current thread is
* cleared when this exception is thrown.
*/
public static void sleep(long millis) throws InterruptedException {
Thread.sleep(millis, 0);
}最终调用到调用到底层
native void sleep(Object lock, long millis, int nanos) throws InterruptedException;
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