我需要在每个时间段运行一段代码,即使应用程序被终止或设备休眠.
我使用AlarmManager实现这一点,它有点工作,但当设备休眠大约五分钟时,服务不再被调用…有谁知道我做错了什么?
这是我的代码:
public class Profiler extends IntentService {
public static final int ALARM_MANAGER_ID = 21436587;
public Profiler() {
super("Profiler");
}
@Override
protected void onHandleIntent(@Nullable Intent intent) {
JodaTimeAndroid.init(getApplicationContext());
System.out.println("Testing profiles");
List<Profile> profiles = MainActivity.getStoredProfiles(getApplicationContext());
if (profiles != null) {
for (Profile profile : profiles) {
if(profile.check()) {
profile.set(getApplicationContext());
}
}
}
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
Intent intent2 = new Intent(getApplicationContext(), Profiler.class);
PendingIntent pIntent = PendingIntent.getService(getApplicationContext(), ALARM_MANAGER_ID, intent2, PendingIntent.FLAG_CANCEL_CURRENT);
alarmManager.setExact(AlarmManager.RTC_WAKEUP, DateTime.now().plusSeconds(10).getMillis(), pIntent);
}
}
还有一个问题.这种调用服务的方法是否可靠?
这是日志
07-24 11:31:24.654 17689-19078/cz.fjerabek.soundprofiler I/System.out: {"type":"Time","hour":0,"minute":0}
07-24 11:31:34.671 17689-20364/cz.fjerabek.soundprofiler I/System.out: Testing profiles
07-24 11:31:34.673 17689-20364/cz.fjerabek.soundprofiler I/System.out: {"type":"Time","hour":11,"minute":15}
07-24 11:31:34.674 17689-20364/cz.fjerabek.soundprofiler I/System.out: {"type":"Time","hour":0,"minute":0}
07-24 11:31:44.692 17689-21571/cz.fjerabek.soundprofiler I/System.out: Testing profiles
07-24 11:31:44.693 17689-21571/cz.fjerabek.soundprofiler I/System.out: {"type":"Time","hour":11,"minute":15}
07-24 11:31:44.694 17689-21571/cz.fjerabek.soundprofiler I/System.out: {"type":"Time","hour":0,"minute":0}
07-24 11:31:54.704 17689-22753/cz.fjerabek.soundprofiler I/System.out: Testing profiles
07-24 11:31:54.705 17689-22753/cz.fjerabek.soundprofiler I/System.out: {"type":"Time","hour":11,"minute":15}
07-24 11:31:54.706 17689-22753/cz.fjerabek.soundprofiler I/System.out: {"type":"Time","hour":0,"minute":0}
07-24 11:32:04.717 17689-24015/cz.fjerabek.soundprofiler I/System.out: Testing profiles
07-24 11:32:04.718 17689-24015/cz.fjerabek.soundprofiler I/System.out: {"type":"Time","hour":11,"minute":15}
07-24 11:32:04.718 17689-24015/cz.fjerabek.soundprofiler I/System.out: {"type":"Time","hour":0,"minute":0}
07-24 11:35:29.032 17689-17475/cz.fjerabek.soundprofiler I/System.out: Testing profiles
07-24 11:35:29.040 17689-17475/cz.fjerabek.soundprofiler I/System.out: {"type":"Time","hour":11,"minute":15}
07-24 11:35:29.050 17689-17475/cz.fjerabek.soundprofiler I/System.out: {"type":"Time","hour":0,"minute":0}
[ 07-24 11:35:29.056 17476:17476 I/ ]
power log dlsym ok
应用程序是在11:31开始的,现在是11:40,因为你可以看到代码的最后一次执行是在11:35而在那之前的11:32它的3分钟然后看起来它每5分钟被调用一次.
我正在启动服务:
Intent bgServiceIntent = new Intent(getApplicationContext(), Profiler.class);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
if(checkNotificationPolicy(getApplicationContext())) {
startService(bgServiceIntent);
}
} else {
startService(bgServiceIntent);
}
我正在使用的设备:HUAWEI P9 lite(VNS-L21)
解决方法:
问题的原因很可能是Doze.
从其有关AlarmManager的文档:
To help with scheduling alarms, Android 6.0 (API level 23) introduces
two newAlarmManager
methods:setAndAllowWhileIdle()
and
setExactAndAllowWhileIdle()
. With these methods, you can set alarms
that will fire even if the device is in Doze.
您应该根据API级别调用相应的AlarmManager方法,以确保即使设备处于休眠状态也会发出警报:
if (Build.VERSION.SDK_INT >= 23) {
alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP,
alarmMillis, alarmIntent);
} else if (Build.VERSION.SDK_INT >= 19) {
alarmManager.setExact(AlarmManager.RTC_WAKEUP,
alarmMillis, alarmIntent);
} else {
alarmManager.set(AlarmManager.RTC_WAKEUP,
alarmMillis, alarmIntent);
}
考虑以下因素:
Neither
setAndAllowWhileIdle()
norsetExactAndAllowWhileIdle()
can
fire alarms more than once per 9 minutes, per app.
正如您所说,您正在测试华为设备.
华为(以及其他制造商)已经实施了一些可以防止警报响起的电池保护功能.您必须将应用添加到“受保护”的应用中.
建议不要以编程方式执行此操作,正确的解决方案可能是在启动时警告用户(例如使用AlertDialog),以便在电池管理器中手动使应用程序“受保护”.
标签:android,alarmmanager 来源: https://codeday.me/bug/20190622/1264532.html
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