您好我使用报警管理器的特定时间间隔为3分钟,我开始监控。它有时工作,突然我注意到有不规则的时间间隔,这是不正确的!您可以在附加日志中看到 “2016年7月20日12:22:03” 时间变化!我连接了手机并关闭了屏幕并进行了监控!每3分钟,我点击服务器并获得响应为1.但是,有一次,它需要5分钟才能到达服务器!这个奇怪的问题为何发生?
这是代码。
public void startAt3() {
Intent alarmIntent = new Intent(ActivityTracking.this, AlarmReceiver.class);
pendingIntent = PendingIntent.getBroadcast(ActivityTracking.this, 0, alarmIntent, 0);
AlarmManager manager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
/* Set the alarm */
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
/* Repeating on every 3 minute interval */
manager.setInexactRepeating(AlarmManager.RTC_WAKEUP,
calendar.getTimeInMillis(),
180000L, pendingIntent);
String mydate = java.text.DateFormat.getDateTimeInstance().format(Calendar.getInstance().getTime());
Log.e("alarm",mydate);
}
AlarmReceiver:
public class AlarmReceiver extends WakefulBroadcastReceiver {//AlarmReceiver class
@Override
public void onReceive(Context context, Intent intent) {//onReceive method
String mydate = java.text.DateFormat.getDateTimeInstance().format(Calendar.getInstance().getTime());
Log.e("alarm",mydate);
Intent service = new Intent(context, SimpleWakefulService.class);//intent to call another class
// Start the service, keeping the device awake while it is launching.
startWakefulService(context, service);//service started
}
SimpleWakefulService:
public class SimpleWakefulService extends IntentService {
public SimpleWakefulService() {
super("SimpleWakefulService");//instantiates simpleWakefulService
}
@Override
protected void onHandleIntent(Intent intent) {
Log.e("simpleWakeful","simpleWakeful");
serviceCall(this); //here is downloadTaskMethod called and getting response as 1.
}
答案 0 :(得分:6)
请勿使用setInexactRepeating
。顾名思义,这并不会安排警报在确切的时间发生。
您可以使用以下内容:
public void scheduleSingleAlarm(Context context) {
Intent intent = new Intent(context, NotificationReceiver.class);
PendingIntent pendingUpdateIntent = PendingIntent.getBroadcast(context,
SINGLE_ALARM_ID, intent, PendingIntent.FLAG_CANCEL_CURRENT);
Calendar futureDate = Calendar.getInstance();
futureDate.add(Calendar.MINUTE, 3);
setSingleExactAlarm(futureDate.getTime().getTime(), pendingUpdateIntent);
}
@SuppressLint("NewApi")
private void setSingleExactAlarm(long time, PendingIntent pIntent) {
if (android.os.Build.VERSION.SDK_INT >= 19) {
mAlarmManager.setExact(AlarmManager.RTC_WAKEUP, time, pIntent);
} else {
mAlarmManager.set(AlarmManager.RTC_WAKEUP, time, pIntent);
}
}
当您收到来自闹钟的呼叫时,请在另外三分钟内安排另一个闹钟响起。我在博客上写了here
答案 1 :(得分:0)
从Android版本19(KitKat)开始,您可以从AlarmManager的官方文档中看到,即使它们已被标记为精确(即使您已经有不精确的重复()),预定的警报也将是不准确的。
警报将与系统事件捆绑在一起,以最大限度地减少设备唤醒和电池使用,这是您所看到的。这是设计的。