如果 30 秒未按下电源键，则重置计数器

Question

我正在开发一个应用程序，如果按四次电源键，它就会开始发送消息。我已经使用广播服务和接收器来完成这项工作。

现在的问题是早上按电源键两次，晚上按电源键两次，还是有提示。

我想限制电源键按下的时间间隔。

这是我的接收器的样子。

private static int countPowerOff=0;

    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
            screenOff = true;
            countPowerOff++;
            if(countPowerOff==3) {
                countPowerOff = 0;
                SendMessage sms = new SendMessage(context);
                try {
                    sms.sendSMS();
                } catch (PackageManager.NameNotFoundException e) {
                    e.printStackTrace();
                }
                catch (IOException ie)
                {
                    ie.printStackTrace();
                }
            }
        } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
            screenOff = false;
            countPowerOff++;
            if (countPowerOff == 3) {
                countPowerOff = 0;
                SendMessage sms = new SendMessage(context);
                try {
                    sms.sendSMS();
                } catch (PackageManager.NameNotFoundException e) {
                    e.printStackTrace();
                } catch (IOException ie) {
                    ie.printStackTrace();
                }
            }
        }

Answer 1

创建一个 CountDownTimer 以在特定时间间隔后将计数器重置为 0。参考 CountDownTimer

Answer 2

每次接收时只需存储时间戳

private final static int INTERVAL = 30000; //interval you want int ms

private final static List<Long> times = new ArrayList<Long>();

public boolean shouldSendMessage(){
    long current = System.currentTimeMillis();
    Iterator<Long> it = times.iterator();
    while(it.hasNext()){
        Long time = it.next();
        if(time<current-INTERVAL){
            it.remove(); // remove old times.
        }else{
            break;
        }
    }
    times.add(current); // add current time
    return times.size()==4;
}

并将您的 countPowerOff==3 替换为 shouldSendMessage()

如果 30 秒未按下电源键，则重置计数器

Reset the counter if the power key is not pressed for 30 seconds

android

broadcastreceiver