我正在使用CountDownTimer
,但似乎没有正常工作。我需要捕捉速度;如果它高于一定的速度,什么也不做。我只是在记录速度。但是如果它以一定的速度下降,我需要在三分钟倒数计时器后启动一个通知。使用倒数计时器
有人可以看看我的代码,看看我做错了什么吗?如果速度超过了,那很好......它不运行计时器,但问题是当它以一定的速度进行时。有时计时器工作,其他时间,不。有时它只记录0,并不显示计时器。
我知道这是在条件下,我只是一直在看它,我看不出有什么可能是错的。四只眼睛比两只好?
任何帮助表示赞赏。谢谢。
public class SpeedManagerService extends Service implements IBaseGpsListener {
private static final String TAG = "SpeedCheckerService";
public boolean vehicleStopped = false;
public boolean timer_started = true;
float nCurrentSpeed = 0;
CountDownTimer timer = new CountDownTimer(180000, 1000) {
// If speed increases again, cancel timer.
public void onTick(long millisUntilFinished) {
Log.i("Current Ride", "Timer countdown: " + millisUntilFinished/1000 +
" seconds.");
if (vehicleStopped) {
// Vehicle should have stopped, but it has started moving again
if (nCurrentSpeed > 0) {
timer.cancel();
timer_started = false;
}
} else if (nCurrentSpeed == 0) {
// If vehicle has just slowed down,
// once speed drops to zero we have stopped
vehicleStopped = true;
}
}
public void onFinish() {
Intent resultIntent = new Intent(SpeedManagerService.this, CurrentRide.class);
NotificationCompat.Builder builder = new NotificationCompat
.Builder(SpeedManagerService.this);
builder.setContentText("Click to save Current Ride info");
builder.setSmallIcon(R.mipmap.ic_launcher);
builder.setContentTitle("Did you just pay for a Ride?");
builder.setContentIntent(PendingIntent.getActivity(SpeedManagerService.this, 0,
resultIntent, 0));
NotificationManagerCompat.from(SpeedManagerService.this).notify(0,
builder.build());
timer.start();
}
}
.start();
@Override
public void onCreate() {
Log.i(TAG, "in onCreate()");
LocationManager locationManager = (LocationManager) this.
getSystemService(Context.LOCATION_SERVICE);
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission
.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this,
android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager
.PERMISSION_GRANTED) {
return;
}
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
SpeedManagerService.this.updateSpeed(null);
}
// On start, run speed service, and return sticky so if error, service will restart
// on its own
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
super.onStartCommand(intent, flags, startId);
Log.i(TAG, "Service onStartCommand");
if (nCurrentSpeed == 0) {
timer_started = false;
}
updateSpeed(null);
return Service.START_STICKY;
}
public void updateSpeed(SpeedLocation location) {
Log.i("Current Ride ", "User is in a Vehicle. Speed is: " +
Math.round(nCurrentSpeed) + " mph. ");
// If a location exists, get speed
if (location != null) {
nCurrentSpeed = location.getSpeed();
}
// In meters/second, if speed goes above 8 mph, then it will just log the
// speed as miles/hour.
if (nCurrentSpeed >= 8) {
}
// However, if speed falls below 5 mph, then countdown timer
// of 3 minutes will begin.
if (nCurrentSpeed <= 5 && !timer_started) {
// Flag to indicate if vehicle has come to a complete stop
vehicleStopped = (nCurrentSpeed == 0);
// Indicate the timer is running
timer_started = true;
timer.start();
}
}
@Override
public void onDestroy() {
timer.cancel();
Log.i(TAG, "Timer cancelled");
super.onDestroy();
}
// Binder returns null because it's not used
@Override
public IBinder onBind(Intent intent) {
return null;
}
// If location changes, update location and speed.
@Override
public void onLocationChanged(Location location) {
if (location != null) {
SpeedLocation myLocation = new SpeedLocation(location, false);
this.updateSpeed(myLocation);
}
}
// If provider is disabled, timer won't run either
@Override
public void onProviderDisabled(String provider) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onGpsStatusChanged(int event) {
}
}
这里的logcat的我得到的一部分:
07-05 17:42:17.742 17023-17023/ I/Current Ride:: User is in a Vehicle. Speed is: 3 mph.
07-05 17:42:17.752 17023-17023/ I/Current Ride: Timer countdown: 179 seconds.
07-05 17:42:17.752 17023-17023/ I/Current Ride: Timer countdown: 179 seconds.
07-05 17:42:17.762 17023-17023/ I/Current Ride: Timer countdown: 179 seconds.
07-05 17:42:17.772 17023-17023/ I/Current Ride: Timer countdown: 179 seconds.
07-05 17:42:17.772 17023-17023/ I/Current Ride: Timer countdown: 179 seconds.
07-05 17:42:17.772 17023-17023/ I/Current Ride: Timer countdown: 179 seconds.
07-05 17:42:17.772 17023-17023/ I/Current Ride: Timer countdown: 179 seconds.
07-05 17:42:17.772 17023-17023/ I/Current Ride: Timer countdown: 179 seconds.
07-05 17:42:17.772 17023-17023/ I/Current Ride: Timer countdown: 179 seconds.
07-05 17:42:17.772 17023-17023/ I/Current Ride: Timer countdown: 179 seconds.
07-05 17:42:17.772 17023-17023/ I/Current Ride: Timer countdown: 179 seconds.
07-05 17:42:17.772 17023-17023/ I/Current Ride: Timer countdown: 179 seconds.
07-05 17:42:17.772 17023-17023/ I/Current Ride: Timer countdown: 179 seconds.
,它会做到这一点像25倍所示的下一个里程之前。
您需要自己设置'setSpeed()',并且还应该使用'hasSpeed()'来验证速度是否可用。此外,如果'location == NULL','nCurrentSpeed'没有更新,所以你可能会使用一个不好的值。 –
所以我把它设置为我需要开始捕捉的速度? location.setSpeed((float)8); ? – Angel
请参阅[这个问题](https://stackoverflow.com/questions/11843801/find-out-the-speed-of-the-user-in-android-using-gps)了解更多关于如何处理' getSpeed()'。 –