我正在编写一个应用程序，每十分钟记录一次新的 GPS 位置。

我尝试过位置轮询器、将位置监听器放入服务中以及将位置监听器放入 Activity 中，但这些方法都不适合我。

我需要一种方法在开始记录我的位置数据前 2 分钟打开 gps 位置监听器(让 gps 有足够的时间找到位置或确定没有信号)。我一直在通过使用在我调用 updatelocation 类之前 2 分钟调用我的 gpsActivity 的警报来执行此操作。然后，我的 updatelocation 类采用 gpsActivity 的位置管理器并从中提取位置。

理论上这应该可行，但是当我把它放在手机上时，我总是收到错误数据(准确度太低或根本没有信号)

如果有人能帮助我，我将不胜感激。

谢谢

警报在更新位置前 2 分钟调用此类

public class GPSActivity extends Activity {

    public static LocationListener loc_listener = null;
    public static LocationManager locationManager = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
        getGPS();
    }

    public static void getGPS() {
        if (loc_listener == null) {
            loc_listener = new LocationListener() {

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

                @Override
                public void onProviderEnabled(String provider) {}

                @Override
                public void onProviderDisabled(String provider) {}

                @Override
                public void onLocationChanged(Location location) {}
            };
        }
        locationManager.requestLocationUpdates(
                LocationManager.GPS_PROVIDER, 0, 0, loc_listener);
    }

    public static void killGPS() {
        if (locationManager != null && loc_listener != null) {
            locationManager.removeUpdates(loc_listener);
        }
    }
}

然后两分钟后这个服务被调用

public class UpdateLocation extends IntentService {

    public static final String id = "";
    public static int retryCount = 0;
    int notificationID = 1;
    // gets the location manager from the GPSActivity
    LocationManager locationManager = GPSActivity.locationManager;

    @Override
    public void onDestroy() {
        super.onDestroy();
    }

    public UpdateLocation() {
        super("UpdateLocation");
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        locationManager = GPSActivity.locationManager;
        SharedPreferences prefs = getSharedPreferences("Settings", 0);
        final String id = prefs.getString("ID", "");
        HttpParams httpParams = new BasicHttpParams();
        // 30seconds and it stops
        HttpConnectionParams.setConnectionTimeout(httpParams, 30000);
        HttpConnectionParams.setSoTimeout(httpParams, 30000);
        DefaultHttpClient httpclient = new DefaultHttpClient(httpParams);
        HttpPost httpost = new HttpPost(
                "http://iphone-radar.com/gps/gps_locations");
        JSONObject holder = new JSONObject();
        try {
            holder.put("id", id);
            Location location = getLocation();
            if (location != null && (location.getAccuracy() < 25)) {
                retryCount = 0;
                Calendar c = Calendar.getInstance();
                SimpleDateFormat sdf = new SimpleDateFormat(
                        "hh:mmaa MM/dd/yyyy");
                holder.put("time", sdf.format(c.getTime()));
                holder.put("time_since_epoch",
                        System.currentTimeMillis() / 1000);
                holder.put("lat", location.getLatitude());
                holder.put("lon", location.getLongitude());
                StringEntity se = new StringEntity(holder.toString());
                httpost.setEntity(se);
                httpost.setHeader("Accept", "application/json");
                httpost.setHeader("Content-type", "application/json");
                ResponseHandler responseHandler = new BasicResponseHandler();
                String response = httpclient.execute(httpost,
                        responseHandler);
                org.json.JSONObject obj;
                obj = new org.json.JSONObject(response);
                SimpleDateFormat sdf2 = new SimpleDateFormat(
                        "yyyy-MM-dd hh:mm:ssaa");
                addHistory(
                        sdf2.format(c.getTime()),
                        "Background GPS",
                        "Latitude: "
                            + String.format("%.6g%n",
                                    location.getLatitude())
                            + "\n"
                            + "Longitude: "
                            + String.format("%.6g%n",
                                    location.getLongitude()));
                SharedPreferences.Editor editor = prefs.edit();
                editor.putString("LastUpdatedTime", sdf.format(c.getTime()));
                editor.commit();
                Intent setAlarm = new Intent(UpdateLocation.this,
                        UpdateLocation.class);
                PendingIntent pendingIntent = PendingIntent.getService(
                        UpdateLocation.this, 0, setAlarm, 0);
                AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
                Calendar calendar = Calendar.getInstance();
                calendar.setTimeInMillis(System.currentTimeMillis());
                int UPDATE_TIME = prefs.getInt("Update_time", 10);
                calendar.add(Calendar.MINUTE, UPDATE_TIME);
                alarmManager.set(AlarmManager.RTC_WAKEUP,
                        calendar.getTimeInMillis(), pendingIntent);
                // sets an alarm for the next time we need to record a
                // location
                GPSActivity.killGPS();
                // turns off the gps location listener
                Intent setAlarm2 = new Intent(UpdateLocation.this,
                        GPSActivity.class);
                PendingIntent pendingIntent2 = PendingIntent.getService(
                        UpdateLocation.this, 0, setAlarm2, 0);
                Calendar calendar2 = Calendar.getInstance();
                calendar2.add(Calendar.MINUTE, UPDATE_TIME - 2);
                alarmManager.set(AlarmManager.RTC_WAKEUP,
                        calendar2.getTimeInMillis(), pendingIntent2);
                // sets an alarm to turn on the gpsActivity 2mins before the
                // next time updatelocation needs to record some data
            }
        } finally {
        }
    }
}

最佳答案

同时使用接收器和服务。为此，您可以在 this link 中找到完整的示例.里面有一个听众。 Listener 可用于您的 Activity ，以通知您已准备好新位置。

关于android - 如何在 Android 中定期查找 gps 位置，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/7740132/