基本上这段代码的工作原理是......它从初始计算开始，并在 X 分钟后使用警报管理器启动服务，该服务得到结束计算并确定两者之间的差异。在每个警报结束时，都会为相同的时间间隔设置一个新警报。当我将时间间隔设置为 10 分钟时，闹钟根本不会响起。
我假设这与手机 CPU 进入睡眠状态有关，因为这是我几天来一直在尝试解决的问题，用许多不同的方法来编写这个算法。
如果有人知道为什么会这样，任何帮助将不胜感激，因为这对我的程序的功能非常重要。作为旁注，这段代码在长达 5 分钟的短时间间隔内完美运行，一旦我插入 10，我什么也没得到。
从我的服务
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
// Set return value
int retVal = START_NOT_STICKY;
if (intent != null) {
System.out.println("Service Thread: " + Thread.currentThread().getName());
// Set up context reference for getObject
self = this;
// Set up global intent reference
theIntent = intent;
// Get data
getData();
// Enter foreground state
String title = "The service has been started...";
String subject = "Service is running.";
String body = "Monitoring your battery usage...";
Notification notification = new Notification(R.drawable.theicon, title,
System.currentTimeMillis());
if (notificationSounds)
notification.defaults |= Notification.DEFAULT_SOUND;
else
notification.sound = null;
Intent notificationIntent = new Intent(this, MainActivity3.class);
PendingIntent pendIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);
notification.setLatestEventInfo(this, subject, body, pendIntent);
startForeground(1500, notification);
// Calculate wait time (convert from minutes to ms)
int waitTime = interval * 60000;
// int waitTime = 15000; // Debug 15 second wait
// Get initial battery
int initialBatt = getBatteryPercent();
// Debug
System.out.println("Initial battery percent: " + initialBatt);
// Get current time
Calendar c = Calendar.getInstance();
Date dateNow = c.getTime();
long timeNow = dateNow.getTime(); // Time in MS
// Set up alarm manager to wait and then execute next step
AlarmManager AM = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
svcIntent1 = new Intent(Service.getObject(), AlarmReceiver.class);
svcIntent1.putExtra("timeToUse", timeToUse);
svcIntent1.putExtra("interval", interval);
svcIntent1.putExtra("rawTime", rawTime);
svcIntent1.putExtra("initialBatt", initialBatt);
svcIntent1.putExtra("sounds", notificationSounds);
pendingIntent = PendingIntent.getBroadcast(Service.getObject(), 0, svcIntent1, PendingIntent.FLAG_UPDATE_CURRENT);
// Set up the next alarm
System.out.println("The current time is " + dateNow.
SimpleDateFormat sdf = new SimpleDateFormat("MM-dd hh:mm:ss a");
Toast.makeText(this, "The current time is " + sdf.format(dateNow), Toast.LENGTH_LONG).show();
Date n = new Date();
n.setTime(timeNow+waitTime);
System.out.println("Next calculation will complete at " + sdf.format(n));
Toast.makeText(this, "Next calculation will complete at " + sdf.format(n), Toast.LENGTH_LONG).show();
AM.setExact(AlarmManager.RTC_WAKEUP, timeNow + waitTime, pendingIntent);
}
return retVal;
}
onReceive 在我的广播接收器类中
@Override
public void onReceive(Context c, Intent intent) {
if(intent != null){
// Get app context
context = Service.getObject();
Toast.makeText(context, "Alarm broadcast received.", Toast.LENGTH_SHORT).show();
// Set up the intent
theIntent = intent;
// Get the extra data
getData();
// Do calculations and get new initial battery level for next alarm
int endBatt = calculateHelper(initialBatt);
// Set up alarm manager to wait and then execute next step
AlarmManager AM = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
Intent svcIntent1 = new Intent(Service.getObject(), AlarmReceiver.class);
svcIntent1.putExtra("timeToUse", timeToUse);
svcIntent1.putExtra("interval", interval);
svcIntent1.putExtra("rawTime", rawTime);
svcIntent1.putExtra("initialBatt", endBatt);
svcIntent1.putExtra("sounds", context.notificationSounds);
PendingIntent pendingIntent = PendingIntent.getBroadcast(Service.getObject(), 0, svcIntent1, PendingIntent.FLAG_UPDATE_CURRENT);
// Get times
long timeNow = dateNow.getTime();
int waitTime = interval * 60000;
// Debug stuff
// int waitTime = 15000;
SimpleDateFormat sdf = new SimpleDateFormat("MM-dd hh:mm:ss a");
System.out.println("The current time is " + sdf.format(dateNow));
Toast.makeText(context, "The current time is " + sdf.format(dateNow), Toast.LENGTH_LONG).show();
Date n = new Date();
n.setTime(timeNow+waitTime);
System.out.println("Next calculation will complete at " + sdf.format(n));
Toast.makeText(context, "Next calculation will complete at " + sdf.format(n), Toast.LENGTH_LONG).show();
// Setting the next alarm
AM.setExact(AlarmManager.RTC_WAKEUP, timeNow + waitTime, pendingIntent);
}
else
notify0(10,"ERROR", "ERROR", "Intent is null", true);
}
在我的清单中...
<receiver
android:name=".AlarmReceiver"
android:enabled="true"
android:exported="true" >
</receiver>
我的新代码（感谢 Larry Schiefer 的建议）
我还发现，即使 WakefulBroadcastReceiver 持有 WakeLock，如果操作系统要关闭服务，它也会在没有 WakeLock 的情况下重新启动。因此，有时需要获取额外的唤醒锁以在 onStartCommand 中进行处理。就我而言，它是必需的。
在我的服务
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
// Acquire WakeLock
PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "Service WakeLock");
wl.acquire();
// Set up global intent reference
theIntent = intent;
if (theIntent != null) {
getData();
if (intent.getAction().equals("Start_Interval")) {
doStart();
}
else if(intent.getAction().equals("End_Interval")){
doEnd();
}
}
else{
Log.e("ERROR", "The intent is NULL inside of onStartCommand. Activity closed?");
cancelAlarm();
stopSelf();
}
// Release WakeLock
wl.release();
return START_STICKY;
}
而我的 onReceive - 将“扩展广播接收器”更改为“扩展 WakefulBroadcastReceiver”
@Override
public void onReceive(Context c, Intent intent) {
if(intent != null){
// Debug
Log.d("Debug","Alarm broadcast received.");
// Set up the global intent reference
theIntent = intent;
// Set up service context reference
context = Service.getObject();
// Get data from the intent
getData();
// Set up the new intent
Log.d("Debug", "Setting up new intent with context: " + c + " and class: " + Service.class);
Intent service = new Intent(c, Service.class);
service.putExtra("timeToUse", timeToUse);
service.putExtra("interval", interval);
service.putExtra("rawTime", rawTime);
service.putExtra("initialBatt", initialBatt);
service.setAction("End_Interval");
// Wake up the service and complete this interval's calculations
startWakefulService(c, service);
}
else {
context.cancelAlarm();
context.stopSelf();
}
}