简单防止多次点击，例如防止弹出两个相同popwidow

1、调用封装方法

if (ClickFilter.isFastClick()) {    return;}

2、具体的封装方法

public class ClickFilter {    private static long lastClickTime;    public synchronized static boolean isFastClick() {        long time = System.currentTimeMillis();        if ( time - lastClickTime < 500) {            return true;        }        lastClickTime = time;        return false;    }}