php - 尝试制作 Android 服务

Question

我正在尝试制作一个 Android 服务，该服务应该在设备启动时启动。它应该每 5 分钟通过 POST 到 php 网络服务发送位置数据到 mySQL 数据库。

它应该发送以下数据:

regID = same regId it used to register to GCM
name = a user name
latitude = the current latitude
longitude = the current longitude

我以前从未做过服务，所以我对正确的做法感到很困惑。

如果您能指导我朝着正确的方向前进，我将不胜感激。

这是我到目前为止所做的:

package servicio;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import android.app.Service;
import android.content.Intent;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;

import com.google.android.gcm.GCMRegistrar;

public class GeoService extends Service {

    LocationManager manejador;
    String proveedor;
    Location localizacion;
    LocationListener locListener;
    String latitud, longitud;
    final String regId = GCMRegistrar
            .getRegistrationId(getApplicationContext());

    // double latitud, longitud;

    @Override
    public void onCreate() {
        manejador = (LocationManager) getSystemService(LOCATION_SERVICE);

    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        Criteria req = new Criteria();
        req.setAccuracy(Criteria.ACCURACY_FINE);

        // Lista de proveedores por criterio
        proveedor = manejador.getBestProvider(req, false);
        localizacion = manejador.getLastKnownLocation(proveedor);

        // location listener
        locListener = new LocationListener() {

            @Override
            public void onLocationChanged(Location location) {
                latitud = String.valueOf(location.getLatitude());
                longitud = String.valueOf(location.getLongitude());

                Thread sendGpsPositionToDB = new Thread(new Runnable() {

                    @Override
                    public void run() {
                        String server = "http://www.grupobcn.es/aquacleanmessenger/";
                        String serverUrl = server + "addposicion.php";
                        List<NameValuePair> params = new ArrayList<NameValuePair>();
                        params.add(new BasicNameValuePair("iddevice", regId));
                        params.add(new BasicNameValuePair("latitud", latitud));
                        params.add(new BasicNameValuePair("longitud", longitud));

                        HttpClient httpclient = new DefaultHttpClient();
                        HttpPost httppost = new HttpPost(serverUrl);

                        try {
                            httppost.setEntity(new UrlEncodedFormEntity(params));
                            HttpResponse response = httpclient
                                    .execute(httppost);
                        } catch (IOException e) {
                        }
                    }

                });

                sendGpsPositionToDB.start();
            }

            @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

            }

        };

        manejador.requestLocationUpdates(LocationManager.GPS_PROVIDER, 300000,
                0, locListener);

        return START_STICKY;
    }

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

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

}

Answer 1

您可以通过注册广播接收器并定义RECEIVE_BOOT_COMPLETED 权限来实现这一点。

当用户安装应用程序时，操作系统将查看 list 并注册自动启动。每当设备启动时，操作系统都会调用您的 onReceive() 以便您可以按如下方式在那里启动您的服务:

在您的 list 中:

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

<service android:name=".GeoService" />

<receiver android:name="servicio.AutoStartGeo">  
    <intent-filter>  
        <action android:name="android.intent.action.BOOT_COMPLETED" />  
    </intent-filter>  
</receiver>

定义 AutoStartGeo 类:

public class AutoStartGeo extends BroadcastReceiver{

@Override
public void onReceive(Context context, Intent intent) {
      if (intent.getAction() != null){
    Intent startServiceIntent = new Intent(context, GeoService.class);
    context.startService(startServiceIntent);       
}
}

}

并不是说如果应用程序安装在 SD 卡上这将不起作用，因为应用程序在 android.intent.action.BOOT_COMPLETED 事件后将不可用。您必须将此通知用户或强制您的应用程序通过以下方式在内部安装:android:installLocation="internalOnly"

还有 note that在 Android 3.0 及更高版本上，用户需要至少启动应用一次，应用才能接收到 android.intent.action.BOOT_COMPLETED 事件。