Question

我在minD中对我从给定的一些答案中检索到的一段代码存有疑问，这些答案用来避免用户多次单击同一按钮。有人可以向我解释此部分代码的作用和示例吗？

代码是

private long mLastClickTime = 0;

//Avoid the user clicking more than one
                if (SystemClock.elapsedRealtime() - mLastClickTime < 1000){
                    return;
                }
                mLastClickTime = SystemClock.elapsedRealtime();

如果条件放置在每个按钮下方。setonclicklistener

我只想了解这段代码仅做的事情：）

Answer 1

elapsedRealtime（）和elapsedRealtimeNanos（）返回自系统启动以来的时间，并包括深度睡眠。保证该时钟是单调的，即使CPU处于省电模式，该时钟也继续滴答作响，因此通用间隔定时的推荐基础也是这样。

进一步检查此方法

https://developer.android.com/reference/android/os/SystemClock.html#elapsedRealtime()

Answer 2

我将使用更详细的变量名称进行解释。

private long mLastClickTime = 0;
private long theUserCannotClickTime = 1000; // milliseconds. the time that must pass before the user's click become valid


long currentTime = SystemClock.elapsedRealtime(); // not necessarily the current realworld time, and it doesn't matter. You can even use System.currentTimeMillis()
long elapsedTime = currentTime - mLastClickTime; // the time that passed after the last time the user clicked the button

if (elapsedTime < theUserCannotClickTime)
    return; // 1000 milliseconds hasn't passed yet. ignore the click
}
// over 1000 milliseconds has passed. do something with the click

// record the time the user last clicked the button validly
mLastClickTime = currentTime;

什么是SystemClock.elapsedRealtime-毫秒？

2 个答案: