在后台服务中使用融合位置获取GPS更新前（15分钟）？

Question

我是android开发的新手需要在后台服务中获取gps位置而无需用户交互，例如每15分钟需要获取坐标并将结果发送到服务器我该如何实现这一点。然后我尝试融合位置api syncadapter组合。它工作，我得到坐标，但我需要在专用的android-service中使用该位置类如何实现这个需要使该服务运行15分钟获取坐标并发送结果到服务器让我发布我的谷歌API客户端类。请检查下面我试过的代码。

import android.content.Context;
import android.location.Location;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.util.Log;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.PendingResult;
import com.google.android.gms.common.api.Status;
import com.google.android.gms.location.FusedLocationProviderApi;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;

import java.text.DateFormat;
import java.util.Date;

/**
 * Created by 4264 on 14-10-2016.
 */

public class Locationlistener implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener,LocationListener  {


    LocationRequest mLocationRequest;
    GoogleApiClient mGoogleApiClient;
    Location mCurrentLocation;
    String mLastUpdateTime;
    private Context context;
    private static final long INTERVAL = 1000 * 10;
    private static final long FASTEST_INTERVAL = 1000 * 5;
    public Locationlistener(Context c)
    {
        context=c;
        //show error dialog if GoolglePlayServices not available
        createLocationRequest();
        mGoogleApiClient = new GoogleApiClient.Builder(context)
                .addApi(LocationServices.API)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .build();
        mGoogleApiClient.connect();
    }
    protected void createLocationRequest() {
        mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(INTERVAL);
        mLocationRequest.setFastestInterval(FASTEST_INTERVAL);
        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    }
    public String lat(){
        String lat=null;
        if(mCurrentLocation==null){
            Log.d("is null","null");
        }
        else {
            lat=String.valueOf(mCurrentLocation.getLatitude());
        }
        return lat;
    }

    protected void startLocationUpdates() {
        PendingResult<Status> pendingResult = LocationServices.FusedLocationApi.requestLocationUpdates(
                mGoogleApiClient, mLocationRequest, this);
        Log.d("started", "Location update started ..............: ");
    }
    public void updateUI() {
        Log.d("updated", "UI update initiated .............");
        if (null != mCurrentLocation) {
            String lat = String.valueOf(mCurrentLocation.getLatitude());
            String lng = String.valueOf(mCurrentLocation.getLongitude());
            Log.e("latw",lat);
            Log.e("Long",lng);

        } else {
            Log.d("", "location is null ...............");
        }
    }


    @Override
    public void onConnected(Bundle bundle) {
        Log.d("connected", "onConnected - isConnected ...............: " + mGoogleApiClient.isConnected());
        startLocationUpdates();
    }


    @Override
    public void onConnectionSuspended(int i) {

    }




    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
        Log.d("failed", "Connection failed: " + connectionResult.toString());
    }

    @Override
    public void onLocationChanged(Location location) {
        Log.d("locationchanged", "Firing onLocationChanged..............................................");
        mCurrentLocation = location;
        mLastUpdateTime = DateFormat.getTimeInstance().format(new Date());
        updateUI();
    }
}

它适用于syncadapter，但我需要在服务中如何实现这一点和另一个疑问，如果用户关闭gps我怎么能得到位置是可能的网络位置更新提前感谢!!

Answer 1

我建议您尽快使用AlarmManager唤醒设备并接收位置（间隔0），然后每15分钟继续睡眠。所以这种方法比不间断服务更好。

如果用户关闭gps，您仍将获得（网络提供商）位置更新但由于位置设置不充分而不准确。另外要解决这个问题，你可以使用SettingsApi

在向位置服务发出请求时，设备的系统设置可能处于阻止应用程序获取其所需位置数据的状态。例如，可以关闭GPS或Wi-Fi扫描。