Question

我知道有很多问题已经被问到这个问题，而且我几天都在经历所有这些问题，但却无法找到合理的答案。我是android和php的新手所以我不知道如何完成任务。

所以基本上首先我想知道如何在后台运行gps作为服务，就像安装应用程序时它启动并定期将坐标发送到Web服务器？

Answer 1

只需创建一个始终在后台运行的服务。

例如： -

<强> AndroidLocationServices

public class AndroidLocationServices extends Service {

WakeLock wakeLock;

private LocationManager locationManager;

public AndroidLocationServices() {
    // TODO Auto-generated constructor stub
}

@Override
public IBinder onBind(Intent arg0) {
    // TODO Auto-generated method stub
    return null;
}

@Override
public void onCreate() {
    // TODO Auto-generated method stub
    super.onCreate();

    PowerManager pm = (PowerManager) getSystemService(this.POWER_SERVICE);

    wakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "DoNotSleep");

    // Toast.makeText(getApplicationContext(), "Service Created",
    // Toast.LENGTH_SHORT).show();

    Log.e("Google", "Service Created");

}

@Override
@Deprecated
public void onStart(Intent intent, int startId) {
    // TODO Auto-generated method stub
    super.onStart(intent, startId);

    Log.e("Google", "Service Started");

    locationManager = (LocationManager) getApplicationContext()
            .getSystemService(Context.LOCATION_SERVICE);

    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
            5000, 5, listener);

}

private LocationListener listener = new LocationListener() {

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

        Log.e("Google", "Location Changed");

        if (location == null)
            return;

        if (isConnectingToInternet(getApplicationContext())) {
            JSONArray jsonArray = new JSONArray();
            JSONObject jsonObject = new JSONObject();

            try {
                Log.e("latitude", location.getLatitude() + "");
                Log.e("longitude", location.getLongitude() + "");

                jsonObject.put("latitude", location.getLatitude());
                jsonObject.put("longitude", location.getLongitude());

                jsonArray.put(jsonObject);

                Log.e("request", jsonArray.toString());

                new LocationWebService().execute(new String[] {
                        Constants.TRACK_URL, jsonArray.toString() });
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

        }

    }

    @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 void onDestroy() {
    // TODO Auto-generated method stub
    super.onDestroy();

    wakeLock.release();

}

public static boolean isConnectingToInternet(Context _context) {
    ConnectivityManager connectivity = (ConnectivityManager) _context
            .getSystemService(Context.CONNECTIVITY_SERVICE);
    if (connectivity != null) {
        NetworkInfo[] info = connectivity.getAllNetworkInfo();
        if (info != null)
            for (int i = 0; i < info.length; i++)
                if (info[i].getState() == NetworkInfo.State.CONNECTED) {
                    return true;
                }

    }
    return false;
}

}

<强> LocationWebService

public class LocationWebService extends AsyncTask<String, String, Boolean> {

public LocationWebService() {
    // TODO Auto-generated constructor stub
}

@Override
protected Boolean doInBackground(String... arg0) {

    ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
    nameValuePairs.add(new BasicNameValuePair("location", arg0[1]));

    HttpClient httpclient = new DefaultHttpClient();
    HttpPost httppost = new HttpPost(arg0[0]);
    HttpParams httpParameters = new BasicHttpParams();

    httpclient = new DefaultHttpClient(httpParameters);

    try {
        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

        HttpResponse response;
        response = httpclient.execute(httppost);
        StatusLine statusLine = response.getStatusLine();
        if (statusLine.getStatusCode() == HttpStatus.SC_OK) {

            Log.e("Google", "Server Responded OK");

        } else {

            response.getEntity().getContent().close();
            throw new IOException(statusLine.getReasonPhrase());
        }
    } catch (Exception e) {
        e.printStackTrace();
    }

    return null;
}
}

您可以在此github项目中找到包含Android App和相应WebFiles的示例项目androidbackgroundgps

运行Gps作为后台服务并将坐标发送到Web服务器（PHP）

1 个答案: