如何使用 android 应用程序在后台跟踪位置？

Question

我是一个完整的初学者，并使用 android 工作室为项目制作 GPS 跟踪应用程序。 即使应用程序关闭，我也需要该应用程序能够跟踪用户的位置。 类似于 Uber 应用程序如何在应用程序未打开的情况下跟踪您的位置。 我该怎么做这样的事情？

Answer 1

在您的清单中添加：

   <uses-permission android:name="android.permission.INTERNET"></uses-permission>
   <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"></uses-permission>
   <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>

在清单中声明服务

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

在您的活动中执行以下步骤

   private static final int REQUEST_PERMISSIONS = 100;
   Double latitude,longitude;
   Geocoder geocoder;
   boolean isPermissionAllowed;

创建：

    geocoder = new Geocoder(this, Locale.getDefault());
    Location_permission();

   if (isPermissionAllowed) {
    Intent intent = new Intent(getApplicationContext(), LocationService.class);
    startService(intent);
    }


  private void Location_permission() {
    if ((ContextCompat.checkSelfPermission(getApplicationContext(), android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED)) {

        if ((ActivityCompat.shouldShowRequestPermissionRationale(MainActivity.this, android.Manifest.permission.ACCESS_FINE_LOCATION))) {


        } else {
            ActivityCompat.requestPermissions(MainActivity.this, new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION

                    },
                    REQUEST_PERMISSIONS);

        }
    } else {
        isPermissionAllowed = true;
    }
}

 @Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);

    switch (requestCode) {
        case REQUEST_PERMISSIONS: {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                isPermissionAllowed = true;

            } else {
                Toast.makeText(getApplicationContext(), "Please allow the permission", Toast.LENGTH_LONG).show();

            }
        }
    }
}

位置服务.java

  public class LocationService extends Service implements LocationListener{

boolean isGPSEnable = false;
boolean isNetworkEnable = false;
double latitude,longitude;
LocationManager locationManager;
Location location;
private Handler mHandler = new Handler();
private Timer mTimer = null;
long notify_interval = 1000;
public static String str_receiver = "servicetutorial.service.receiver";
Intent intent;




public LocationService() {

}

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

@Override
public void onCreate() {
    super.onCreate();

    mTimer = new Timer();
    mTimer.schedule(new TimerTaskToGetLocation(),5,notify_interval);
    intent = new Intent(str_receiver);
}

@Override
public void onLocationChanged(Location location) {
 **//you can get updated location here**
}

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

}

@Override
public void onProviderEnabled(String provider) {

}

@Override
public void onProviderDisabled(String provider) {

}

private void fn_getlocation(){
    locationManager = (LocationManager)getApplicationContext().getSystemService(LOCATION_SERVICE);
    isGPSEnable = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
    isNetworkEnable = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);

    if (!isGPSEnable && !isNetworkEnable){

    }else {

        if (isNetworkEnable){
            location = null;
            locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,1000,0,this);
            if (locationManager!=null){
                location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                if (location!=null){

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

                    latitude = location.getLatitude();
                    longitude = location.getLongitude();
                    fn_update(location);
                }
            }

        }


        if (isGPSEnable){
            location = null;
            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,1000,0,this);
            if (locationManager!=null){
                location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
                if (location!=null){
                    Log.e("latitude",location.getLatitude()+"");
                    Log.e("longitude",location.getLongitude()+"");
                    latitude = location.getLatitude();
                    longitude = location.getLongitude();
                    fn_update(location);
                }
            }
        }


    }

}

private class TimerTaskToGetLocation extends TimerTask{
    @Override
    public void run() {

        mHandler.post(new Runnable() {
            @Override
            public void run() {
                fn_getlocation();
            }
        });

    }
}

private void fn_update(Location location){

    intent.putExtra("latutide",location.getLatitude()+"");
    intent.putExtra("longitude",location.getLongitude()+"");
    sendBroadcast(intent);
}

}