标签：cpu work roi -o oid 参考资料 star form ini
PARTIAL_WAKE_LOCK:保持CPU 运转，屏幕和键盘灯有可能是关闭的。
SCREEN_DIM_WAKE_LOCK：保持CPU 运转，允许保持屏幕显示但有可能是灰的，允许关闭键盘灯
SCREEN_BRIGHT_WAKE_LOCK：保持CPU 运转，允许保持屏幕高亮显示，允许关闭键盘灯
FULL_WAKE_LOCK：保持CPU 运转，保持屏幕高亮显示，键盘灯也保持亮度
ACQUIRE_CAUSES_WAKEUP：强制使屏幕亮起，这种锁主要针对一些必须通知用户的操作.
ON_AFTER_RELEASE：当锁被释放时，保持屏幕亮起一段时间**
方法（一）
1 [BroadcastReceiver(Enabled = true)] 2 public class AlarmService : BroadcastReceiver 3 { 4 //public event EventHandler WakeLockStatusChanged; 5 public override void OnReceive(Context context, Intent intent) 6 { 7 PowerManager pm = (PowerManager)context.GetSystemService(Context.PowerService); 8 PowerManager.WakeLock wl = pm.NewWakeLock(WakeLockFlags.Partial, "MyWakelockTag"); 9 wl.Acquire(); 10 //if (wl.IsHeld) 11 //{ 12 // wl.Release(); 13 //} 14 } 15 }
1 private void InitBroadcastReceiver() 2 { 3 _alarmService = new AlarmService(); 4 Application.Context.RegisterReceiver(_alarmService, new IntentFilter(ConnectivityManager.ConnectivityAction)); 5 } 6 7 protected override void OnStart() 8 { 9 base.OnStart(); 10 InitBroadcastReceiver(); 11 } 12 13 protected override void OnStop() 14 { 15 base.OnStop(); 16 17 if (_alarmService != null) 18 { 19 Application.Context.UnregisterReceiver(_alarmService); 20 _alarmService = null; 21 } 22 23 }
方法（二）
1 //获取电源锁，保持该服务在屏幕熄灭时仍然获取CPU时，保持运行 2 private void AcquireWakeLock() 3 { 4 if (null == _wakeLock) 5 { 6 PowerManager pm = (PowerManager)GetSystemService(Context.PowerService); 7 _wakeLock = pm.NewWakeLock(WakeLockFlags.Partial | WakeLockFlags.OnAfterRelease, "MyWakelockTag"); 8 if (_wakeLock != null) 9 { 10 _wakeLock.Acquire(); 11 } 12 } 13 } 14 15 //释放设备电源锁 16 private void ReleaseWakeLock() 17 { 18 if (null != _wakeLock || _wakeLock.IsHeld) 19 { 20 _wakeLock.Release(); 21 _wakeLock = null; 22 } 23 }
参考资料：
https://docs.microsoft.com/zh-cn/dotnet/api/Android.OS.PowerManager.NewWakeLock?view=xamarin-android-sdk-9#Android_OS_PowerManager_NewWakeLock_Android_OS_WakeLockFlags_System_String_
https://stackoverflow.com/questions/54532221/prevent-app-from-going-on-onpause-when-turning-screen-off-using-partial-wakelock/54548392?r=SearchResults#54548392
http://www.itgo.me/a/x9010099145016859770/xamarin-forms-broadcast-receiver-not-working-when-app-is-closed
xamarin/xamarin.forms 在锁屏电源唤醒时保持后台运行
标签：cpu work roi -o oid 参考资料 star form ini
原文地址：https://www.cnblogs.com/mschen/p/11294665.html
