Question

我创建了一个使用LocationListener和location.getSpeed()来计算Android设备速度的应用。我使用短信OSA 55设置了速度限制。此处OSA为Over Speed Alert，55为kmph中的速度限制。当设备行进超过55 kmph超过10秒时，它将以当前速度和当前纬度和经度向移动号码发送短信。我使用以下代码完成了这项工作。

private void sendOverSpeedAlert() {
    Toast.makeText(MainPage.this,"Over Speed Alert Set",Toast.LENGTH_LONG).show();
    final SharedPreferences account=getSharedPreferences("admins",MODE_PRIVATE);

    String overSpeed=account.getString("osa", "");
    double overSpeedKm=Double.parseDouble(overSpeed);
    final DecimalFormat dFormat = new DecimalFormat("#");
    String overSpeedFormat=dFormat.format(overSpeedKm);
    final double overSpeedDouble=Double.parseDouble(overSpeedFormat);

    LocationManager locationManager=(LocationManager)getSystemService(Context.LOCATION_SERVICE);
    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, new LocationListener() {
        @Override
        public void onLocationChanged(final Location location) {
            double currentSpeed=(location.getSpeed())*3.6;
            String currentSpeedString=dFormat.format(currentSpeed);
            final double currentSpeedDouble=Double.parseDouble(currentSpeedString);
            if (currentSpeedDouble>overSpeedDouble){
                CountDownTimer countDownTimer=new CountDownTimer(10000,1000) {
                    @Override
                    public void onTick(long millisUntilFinished) {

                    }

                    @Override
                    public void onFinish() {
                        double latitude=location.getLatitude();
                        double longitude=location.getLongitude();
                        DecimalFormat decimalFormat=new DecimalFormat("#.####");
                        Date date=new Date();
                        SimpleDateFormat sdf=new SimpleDateFormat("kk:mm");
                        String time=sdf.format(date);

                        SmsManager smsManager=SmsManager.getDefault();
                        String sms=" 'ALERT-OVER SPEED'\n\n'!+"+decimalFormat.format(latitude)+",+"+decimalFormat.format(longitude)+","+time+"'\n\nSpeed='"+currentSpeedDouble+"'Km/Hr('"+overSpeedDouble+"')";
                        smsManager.sendTextMessage(logPreferences.getString("admin1",""),null,sms,null,null);

                        MediaPlayer media = new MediaPlayer();
                        media = MediaPlayer.create(MainPage.this, R.raw.buzzer);
                        media.setAudioStreamType(AudioManager.STREAM_MUSIC);
                        media.setLooping(false);
                        media.start();
                    }
                }.start();
            }
        }

        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {

        }

        @Override
        public void onProviderEnabled(String provider) {

        }

        @Override
        public void onProviderDisabled(String provider) {

        }
    });

}

我的问题是，当位置以小数点变化时，它会收听速度，如果它高于极限速度则会发送短信。它今天通过发送数百个短信来干掉我的短信限制。我不想向每个纬度和经度变化发送警报。我只想在设备超出限制时发送单个警报。然后设备必须达到20 kmph以收听下一个警报。来人帮帮我。谢谢。

Android GPS Over Speed Alert

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