手机重新启动后，出现“不幸的是应用已停止”错误。我的手机是Oreo 8，但是另一台装有Nougat 7.1.1的手机在手机重启后也出现相同的错误。我将GitHub上的James Montemagnos的MyStepCounter绑定服务代码与VS 2017（Xamarin Cross-Platform App）中的一些更改结合使用。如果手机在重启后由于此错误而启动，则该应用程序可以正常工作，否则，它不会计算步骤并且无法在后台运行。如果我在“电话设置-常规-电池-省电排除”中检查了该应用程序，则在电话重启后它可以正常工作，并且它在后台计步，而无需在Oreo手机上启动该应用程序。但是另一部手机上没有节电设置的设置
BootReceiver.cs
[BroadcastReceiver(Enabled = true, Exported = true, DirectBootAware = true)]
[IntentFilter(new string[] { Intent.ActionBootCompleted, Intent.ActionLockedBootCompleted, "android.intent.action.QUICKBOOT_POWERON", "com.htc.intent.action.QUICKBOOT_POWERON" })]
public class BootReceiver : BroadcastReceiver
{
public override void OnReceive(Context context, Intent intent)
{
var stepServiceIntent = new Intent(context, typeof(StepService));
context.StartService(stepServiceIntent);
}
}
StepServiceBinder.cs
public class StepServiceBinder : Binder
{
StepService stepService;
public StepServiceBinder(StepService service)
{
this.stepService = service;
}
public StepService StepService
{
get { return stepService; }
}
}
StepServiceConnection.cs
public class StepServiceConnection : Java.Lang.Object, IServiceConnection
{
MainActivity activity;
public StepServiceConnection(MainActivity activity)
{
this.activity = activity;
}
public void OnServiceConnected(ComponentName name, IBinder service)
{
var serviceBinder = service as StepServiceBinder;
if (serviceBinder != null)
{
activity.Binder = serviceBinder;
activity.IsBound = true;
}
}
public void OnServiceDisconnected(ComponentName name)
{
activity.IsBound = false;
}
}
StepService.cs
public class StepServiceConnection : Java.Lang.Object, IServiceConnection
{
MainActivity activity;
public StepServiceConnection(MainActivity activity)
{
this.activity = activity;
}
public void OnServiceConnected(ComponentName name, IBinder service)
{
var serviceBinder = service as StepServiceBinder;
if (serviceBinder != null)
{
activity.Binder = serviceBinder;
activity.IsBound = true;
}
}
public void OnServiceDisconnected(ComponentName name)
{
activity.IsBound = false;
}
}
StepService.cs
[Service(Enabled = true)]
[IntentFilter(new String[] { "com.PedometerApp.StepService" })]
public class StepService : Service, ISensorEventListener, INotifyPropertyChanged
{
private SensorManager sManager;
private bool isRunning;
private long stepsToday = 0;
public bool WarningState
{
get;
set;
}
public long StepsToday
{
get { return stepsToday; }
set
{
if (stepsToday == value)
return;
stepsToday = value;
OnPropertyChanged("StepsToday");
Settings.CurrentDaySteps = value;
MessagingCenter.Send<object, long>(this, "Steps", Settings.CurrentDaySteps);
}
}
public override StartCommandResult OnStartCommand(Intent intent, StartCommandFlags flags, int startId)
{
var alarmManager = ((AlarmManager)ApplicationContext.GetSystemService(AlarmService));
var intent2 = new Intent(this, typeof(StepService));
intent2.PutExtra("warning", WarningState);
var stepIntent = PendingIntent.GetService(ApplicationContext, 200, intent2, PendingIntentFlags.UpdateCurrent);
alarmManager.Set(AlarmType.Rtc, Java.Lang.JavaSystem
.CurrentTimeMillis() + 1000 * 60 * 60, stepIntent);
var warning = false;
if (intent != null)
warning = intent.GetBooleanExtra("warning", false);
Startup();
return StartCommandResult.Sticky;
}
public override void OnTaskRemoved(Intent rootIntent)
{
base.OnTaskRemoved(rootIntent);
UnregisterListeners();
var intent = new Intent(this, typeof(StepService));
intent.PutExtra("warning", WarningState);
((AlarmManager)GetSystemService(AlarmService)).Set(AlarmType.Rtc, Java.Lang.JavaSystem
.CurrentTimeMillis() + 500,
PendingIntent.GetService(this, 201, intent, 0));
}
private void Startup(bool warning = false)
{
CrunchDates(true);
if (!isRunning)
{
RegisterListeners();
WarningState = warning;
}
isRunning = true;
}
public override void OnDestroy()
{
base.OnDestroy();
UnregisterListeners();
isRunning = false;
CrunchDates();
}
void RegisterListeners()
{
sManager = GetSystemService(SensorService) as SensorManager;
sManager.RegisterListener(this, sManager.GetDefaultSensor(SensorType.StepCounter), SensorDelay.Ui);
}
void UnregisterListeners()
{
if (!isRunning)
return;
try
{
var sensorManager = (SensorManager)GetSystemService(Context.SensorService);
sensorManager.UnregisterListener(this);
isRunning = false;
}
catch (Exception ex)
{
}
}
StepServiceBinder binder;
public override Android.OS.IBinder OnBind(Android.Content.Intent intent)
{
binder = new StepServiceBinder(this);
return binder;
}
public void OnAccuracyChanged(Sensor sensor, SensorStatus accuracy)
{
//do nothing here
}
public void AddSteps(long count)
{
if (lastSteps == 0)
{
lastSteps = count;
}
newSteps = count - lastSteps;
if (newSteps < 0)
newSteps = 1;
else if (newSteps > 100)
newSteps = 1;
lastSteps = count;
CrunchDates();
Settings.TotalSteps += newSteps;
StepsToday = Settings.TotalSteps - Settings.StepsBeforeToday;
}
long newSteps = 0;
long lastSteps = 0;
public void OnSensorChanged(SensorEvent e)
{
if (lastSteps < 0)
lastSteps = 0;
var count = (long)e.Values[0];
WarningState = false;
AddSteps(count);
}
private void CrunchDates(bool startup = false)
{
if (!Utils.IsSameDay)
{
var yesterday = Settings.CurrentDay;
var dayEntry = StepEntryManager.GetStepEntry(yesterday);
if (dayEntry == null || dayEntry.Date.DayOfYear != yesterday.DayOfYear)
{
dayEntry = new StepEntry();
}
dayEntry.Date = yesterday;
dayEntry.Steps = Settings.CurrentDaySteps;
Settings.CurrentDay = DateTime.Today;
Settings.CurrentDaySteps = 0;
Settings.StepsBeforeToday = Settings.TotalSteps;
StepsToday = 0;
try
{
StepEntryManager.SaveStepEntry(dayEntry);
}
catch (Exception ex)
{
Console.WriteLine("Error {0}", ex.Message);
}
}
else if (startup)
{
StepsToday = Settings.TotalSteps - Settings.StepsBeforeToday;
}
}
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(string name)
{
if (PropertyChanged == null)
return;
PropertyChanged(this, new PropertyChangedEventArgs(name));
}
}