自动发送每x分钟通过Android设备更新GPS坐标到Web服务器

时间:2014-04-01 06:06:57

标签: android asp.net sql-server web-services gps

我是Android开发的新手。我想构建一个Android应用程序,它使用后台服务以指定的间隔(比如15分钟)向ASP.net Webservice发送GPS坐标。我成功地将ASP.net Webservice中的坐标从Android设备获取到SQL Server 2008数据库,但是,即使我行进了50公里的距离,纬度和经度值也保持不变,更新间隔有时以秒为单位,有时以小时为单位。我引用了许多示例源代码并实现了以下代码。

public class GPSTracker extends Service implements LocationListener {

private final Context mContext;

// flag for GPS status
boolean isGPSEnabled = false;

// flag for network status
boolean isNetworkEnabled = false;

// flag for GPS status
boolean canGetLocation = false;

Location location; // location
double latitude; // latitude
double longitude; // longitude

// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters

// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute

// Declaring a Location Manager
protected LocationManager locationManager;

public GPSTracker(Context context) {
    this.mContext = context;
    getLocation();
}

public Location getLocation() {
    try {
        locationManager = (LocationManager) mContext
                .getSystemService(LOCATION_SERVICE);

        // getting GPS status
        isGPSEnabled = locationManager
                .isProviderEnabled(LocationManager.GPS_PROVIDER);

        // getting network status
        isNetworkEnabled = locationManager
                .isProviderEnabled(LocationManager.NETWORK_PROVIDER);

        if (!isGPSEnabled && !isNetworkEnabled) {
            // no network provider is enabled
        } else {
            this.canGetLocation = true;
            if (isNetworkEnabled) {
                locationManager.requestLocationUpdates(
                        LocationManager.NETWORK_PROVIDER,
                        MIN_TIME_BW_UPDATES,
                        MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                Log.d("Network", "Network");
                if (locationManager != null) {
                    location = locationManager
                            .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                    if (location != null) {
                        latitude = location.getLatitude();
                        longitude = location.getLongitude();
                    }
                }
            }
            // if GPS Enabled get lat/long using GPS Services
            if (isGPSEnabled) {
                if (location == null) {
                    locationManager.requestLocationUpdates(
                            LocationManager.GPS_PROVIDER,
                            MIN_TIME_BW_UPDATES,
                            MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                    Log.d("GPS Enabled", "GPS Enabled");
                    if (locationManager != null) {
                        location = locationManager
                                .getLastKnownLocation(LocationManager.GPS_PROVIDER);
                        if (location != null) {
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                        }
                    }
                }
            }
        }

    } catch (Exception e) {
        e.printStackTrace();
    }

    return location;
}

/**
 * Stop using GPS listener
 * Calling this function will stop using GPS in your app
 * */
public void stopUsingGPS(){
    if(locationManager != null){
        locationManager.removeUpdates(GPSTracker.this);
    }       
}

/**
 * Function to get latitude
 * */
public double getLatitude(){
    if(location != null){
        latitude = location.getLatitude();
    }

    // return latitude
    return latitude;
}

/**
 * Function to get longitude
 * */
public double getLongitude(){
    if(location != null){
        longitude = location.getLongitude();
    }

    // return longitude
    return longitude;
}

/**
 * Function to check GPS/wifi enabled
 * @return boolean
 * */
public boolean canGetLocation() {
    return this.canGetLocation;
}

/**
 * Function to show settings alert dialog
 * On pressing Settings button will lauch Settings Options
 * */
public void showSettingsAlert(){
    AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);

    // Setting Dialog Title
    alertDialog.setTitle("GPS is settings");

    // Setting Dialog Message
    alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");

    // On pressing Settings button
    alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog,int which) {
            Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
            mContext.startActivity(intent);
        }
    });

    // on pressing cancel button
    alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
            dialog.cancel();
        }
    });

    // Showing Alert Message
    alertDialog.show();
}

@Override
public void onLocationChanged(Location location) {
    // TODO Auto-generated method stub

}

@Override
public void onProviderDisabled(String provider) {
    // TODO Auto-generated method stub

}

@Override
public void onProviderEnabled(String provider) {
    // TODO Auto-generated method stub

}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
    // TODO Auto-generated method stub

}

@Override
public IBinder onBind(Intent intent) {
    // TODO Auto-generated method stub
    return null;
}
}

public class TimeServiceGPS extends Service {
// constant
public static final long NOTIFY_INTERVAL = 900 * 1000; // 15 mins
GPSTracker gps;
DatabaseAdapter dba;
final Context context = this;
private Cursor cursor;
// run on another Thread to avoid crash
private Handler mHandler = new Handler();
// timer handling
private Timer mTimer = null;
private double latitude,longitude;
public static final String PREFS_NAME = "MyPrefsFile";
private final String log = "ServiceGPS";
private static String responseJSON;
private String JSONStr;

UserSessionManager session;
HashMap<String, String> user;
Common common;

@Override
public IBinder onBind(Intent intent) {
    return null;
}

@Override
public void onCreate() {

    dba=new DatabaseAdapter(this);
    // Session class instance
            session = new UserSessionManager(getApplicationContext());
            // get user data from session
            user = session.getUserDetails();
            common= new Common(getApplicationContext());

    // cancel if already existed
    if(mTimer != null) {
        mTimer.cancel();
    } else {
        // recreate new
        mTimer = new Timer();
    }
    // schedule task
    mTimer.scheduleAtFixedRate(new TimeDisplayTimerTask(), 0, NOTIFY_INTERVAL);
}

class TimeDisplayTimerTask extends TimerTask {

    @Override
    public void run() {
        // run on another thread
        mHandler.post(new Runnable() {

            @Override
            public void run() {
                gps = new GPSTracker(TimeServiceGPS.this);      
                if(gps.canGetLocation()){

                    latitude = gps.getLatitude();
                    longitude = gps.getLongitude();

                    AsyncGPSWSCall task= new AsyncGPSWSCall();
                    task.execute();
                    //common.showToast("Your Location is - \nLat: " + latitude + "\nLong: " + longitude + "\nDate: " + dba.getDateTime()+ "\nUsername: " + user.get(UserSessionManager.KEY_USERNAME)+ "\nIMEI: " + user.get(UserSessionManager.KEY_IMEI)); 
                }
                else{
                    gps.showSettingsAlert();
                }

            }

        });
    }

    //Async Class to send Credentials
    private class AsyncGPSWSCall extends AsyncTask<String, Void, Void> {
        @Override
        protected Void doInBackground(String... params) {
            Log.i(log, "doInBackground");
            dba.openR();

            try {
                //Creation of JSON string
                JSONObject json = new JSONObject();
                json.put("latitude", latitude);
                json.put("longitude", longitude);
                json.put("username",user.get(UserSessionManager.KEY_USERNAME));
                json.put("imeino",user.get(UserSessionManager.KEY_IMEI));
                json.put("createddate",dba.getDateTime());
                JSONStr=json.toString();

            } catch (JSONException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            finally
            {
                dba.close();
            }
            if(common.isConnected())
            {
                try {
                    dba.openR();
                    cursor = dba.GetUrl();
                    if (cursor.moveToFirst()) {
                        Log.i(log,"Calling Cursor url");
                        Log.i(log,cursor.getString(cursor.getColumnIndex("URL")));
                        responseJSON = common.invokeJSONWS(JSONStr,"json","InsertGPSDetails",cursor.getString(cursor.getColumnIndex("URL")) );
                        Log.i(log,"Value of Json to Server - GPS: "+ JSONStr);
                        //Testing purpose. returns success on insert on SqlServer
                        common.showToast(responseJSON);
                        latitude=0;
                        longitude=0;
                    }                       
                } catch (Exception e) {
                    // TODO: handle exception
                    e.printStackTrace();
                } finally {cursor.close();dba.close(); }

            }
            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            Log.i(log, "onPostExecute");

        }

        @Override
        protected void onPreExecute() {
            Log.i(log, "onPreExecute");
        }

        @Override
        protected void onProgressUpdate(Void... values) {
            Log.i(log, "onProgressUpdate");
        }
    }
}

}

我正在检查我的应用仪表板活动中是否正在运行TimeServiceGPS服务。在清单文件中,我添加了<service android:name="com.example.test.TimeServiceGPS" /> 我需要做什么改变才能每隔15分钟获得该位置的实际坐标。提前谢谢。

1 个答案:

答案 0 :(得分:1)

    GPSTracker gps;         
  gps = new GPSTracker(MainActivity.this);
          if(gps.canGetLocation()){ 
         latitude = gps.getLatitude();
         longitude = gps.getLongitude(); 
          }else{
        gps.showSettingsAlert();
       }

和gpstracker类是这样的:

package com.your.package;

import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.provider.Settings;
import android.util.Log;

public class GPSTracker extends Service implements LocationListener {

    private final Context mContext;

    // flag for GPS status
    boolean isGPSEnabled = false;

    // flag for network status
    boolean isNetworkEnabled = false;

    // flag for GPS status
    boolean canGetLocation = false;

    Location location; // location
    double latitude; // latitude
    double longitude; // longitude

    // The minimum distance to change Updates in meters
    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters

    // The minimum time between updates in milliseconds
    private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute

    // Declaring a Location Manager
    protected LocationManager locationManager;

    public GPSTracker(Context context) {
        this.mContext = context;
        getLocation();
    }

    public Location getLocation() {
        try {
            locationManager = (LocationManager) mContext
                    .getSystemService(LOCATION_SERVICE);

            // getting GPS status
            isGPSEnabled = locationManager
                    .isProviderEnabled(LocationManager.GPS_PROVIDER);

            // getting network status
            isNetworkEnabled = locationManager
                    .isProviderEnabled(LocationManager.NETWORK_PROVIDER);

            if (!isGPSEnabled && !isNetworkEnabled) {
                // no network provider is enabled
            } else {
                this.canGetLocation = true;
                if (isNetworkEnabled) {
                    locationManager.requestLocationUpdates(
                            LocationManager.NETWORK_PROVIDER,
                            MIN_TIME_BW_UPDATES,
                            MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                    Log.d("Network", "Network");
                    if (locationManager != null) {
                        location = locationManager
                                .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                        if (location != null) {
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                        }
                    }
                }
                // if GPS Enabled get lat/long using GPS Services
                if (isGPSEnabled) {
                    if (location == null) {
                        locationManager.requestLocationUpdates(
                                LocationManager.GPS_PROVIDER,
                                MIN_TIME_BW_UPDATES,
                                MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                        Log.d("GPS Enabled", "GPS Enabled");
                        if (locationManager != null) {
                            location = locationManager
                                    .getLastKnownLocation(LocationManager.GPS_PROVIDER);
                            if (location != null) {
                                latitude = location.getLatitude();
                                longitude = location.getLongitude();
                            }
                        }
                    }
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

        return location;
    }

    /**
     * Stop using GPS listener
     * Calling this function will stop using GPS in your app
     * */
    public void stopUsingGPS(){
        if(locationManager != null){
            locationManager.removeUpdates(GPSTracker.this);
        }       
    }

    /**
     * Function to get latitude
     * */
    public double getLatitude(){
        if(location != null){
            latitude = location.getLatitude();
        }

        // return latitude
        return latitude;
    }

    /**
     * Function to get longitude
     * */
    public double getLongitude(){
        if(location != null){
            longitude = location.getLongitude();
        }

        // return longitude
        return longitude;
    }

    /**
     * Function to check GPS/wifi enabled
     * @return boolean
     * */
    public boolean canGetLocation() {
        return this.canGetLocation;
    }

    /**
     * Function to show settings alert dialog
     * On pressing Settings button will lauch Settings Options
     * */
    public void showSettingsAlert(){
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);

        // Setting Dialog Title
        alertDialog.setTitle("GPS is settings");

        // Setting Dialog Message
        alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");

        // On pressing Settings button
        alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog,int which) {
                Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                mContext.startActivity(intent);
            }
        });

        // on pressing cancel button
        alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
            dialog.cancel();
            }
        });

        // Showing Alert Message
        alertDialog.show();
    }

    @Override
    public void onLocationChanged(Location location) {
    }

    @Override
    public void onProviderDisabled(String provider) {
    }

    @Override
    public void onProviderEnabled(String provider) {
    }

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

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }

}

你每隔15分钟就可以使用这个功能:

 Timer myTimer;
  private boolean timerRunning = false;
  private long RETRY_TIME = 15000;
  private long START_TIME = 2000;

并在创建:

  mcont=this;
  myTimer = new Timer();
  myTimer.scheduleAtFixedRate(new Task(), START_TIME, RETRY_TIME);
  timerRunning = true;

你可以像这样触发它:

 if (!timerRunning) {
         mcont=this;
         myTimer = new Timer();
         myTimer.scheduleAtFixedRate(new Task(), START_TIME, RETRY_TIME);
         timerRunning = true;
     }

,任务类在这里:

public class Task extends TimerTask {

    @Override
    public void run() {
          //you can put your upload code here
    }
}