获取片段内的当前位置

Question

我需要获取用户的当前位置并将其值存储在单独的经度和纬度变量中。现在，在下面的代码中，我已经对其进行了静态设置。

这是我的位置片段：（我的所有片段都使用viewpager显示在活动中）

package com.example.atry.MakeComplaint

import Retrofit.INodeJS
import Retrofit.Observables
import Retrofit.RetrofitClient
import android.app.Activity
import android.content.ContentValues.TAG
import android.content.Context
import android.content.Context.*
import android.content.Intent
import android.content.IntentSender
import android.content.pm.PackageManager
import android.location.*
import android.net.Uri
import android.os.Bundle
import android.util.Log
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import com.google.android.gms.maps.MapView

import android.widget.LinearLayout
import androidx.appcompat.app.AppCompatActivity
import androidx.core.app.ActivityCompat
import androidx.core.content.ContextCompat
import com.example.atry.R
import com.google.android.gms.common.GooglePlayServicesNotAvailableException
import com.google.android.gms.common.api.ResolvableApiException
import com.google.android.gms.dynamic.SupportFragmentWrapper
import com.google.android.gms.location.*
import com.google.android.gms.maps.*
import com.google.android.gms.maps.model.*
import io.reactivex.disposables.CompositeDisposable
import kotlinx.android.synthetic.main.fragment_complaint_details.view.*
import kotlinx.android.synthetic.main.fragment_location.*
import kotlinx.android.synthetic.main.fragment_location.view.*
import retrofit2.Call
import retrofit2.Response
import java.io.IOException
import java.util.Observer
import java.util.Optional.empty
import javax.security.auth.callback.Callback


class LocationFragment : Fragment(), OnMapReadyCallback, GoogleMap.OnMarkerClickListener {

    override fun onMarkerClick(p0: Marker?)= false

    private lateinit var map: GoogleMap
    private lateinit var mapView : MapView
//    lateinit var typeName: String
    lateinit var myAPI: INodeJS
    var MyCategory: Observables.ComplaintType?=null


    private var listener: OnLocationFragmentInteractionListener? = null


    var objectComplaint =
        Observables.Complaint(
        1 , "dummy problem" ,
        "url" ,
        Observables.Location("78.4","17.4"),
        Observables.ComplaintType("Smell", "null"),
        Observables.Status(2 , "Unresolved")

    )






    //for updating user's location/ for current location

    private lateinit var fusedLocationClient: FusedLocationProviderClient
    private lateinit var lastLocation: Location
    private lateinit var locationCallback: LocationCallback
    private lateinit var locationRequest: LocationRequest
    private var locationUpdateState = false

    companion object {
        private const val LOCATION_PERMISSION_REQUEST_CODE = 1

        private const val REQUEST_CHECK_SETTINGS = 2  //For updating user's location as they move

    }







    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val permissions = arrayOf(android.Manifest.permission.ACCESS_FINE_LOCATION, android.Manifest.permission.ACCESS_COARSE_LOCATION)
        requestPermissions( permissions,0)
        arguments?.let {

        }

        //INIT API

        val retrofit = RetrofitClient.instanc
        myAPI = retrofit.create(INodeJS::class.java)

        //static way of bringing category names

//        if(arguments!!.getString("typeName") !=null){
//
//            typeName =arguments!!.getString("typeName")
//            Log.d("got it!!",typeName)
//
//        }




    }


    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        val v = inflater.inflate(com.example.atry.R.layout.fragment_location, container, false)
        mapView = v.findViewById(R.id.maps)
        mapView.onCreate(savedInstanceState)
        mapView.onResume()




       try {
        MapsInitializer.initialize(getActivity()!!.getApplicationContext());
    } catch (sendEx: IntentSender.SendIntentException) {
        sendEx.printStackTrace();
    }

        mapView.getMapAsync(this)




        v.backToList.setOnClickListener {
            backFragment()

        }

        v.forwardToDescription.setOnClickListener{
            getAllData()


        }

        return v
    }

    override public fun onResume() {
    super.onResume();
    mapView.onResume();
}

override public fun onPause() {
    super.onPause();
    mapView.onPause();
}

override public fun onDestroy() {
    super.onDestroy();
    mapView.onDestroy();
}

override public fun onLowMemory() {
    super.onLowMemory();
    mapView.onLowMemory()
}

    override fun onMapReady(googleMap: GoogleMap?) {
        map = googleMap!!
        map.uiSettings?.isZoomControlsEnabled = true
        map.isMyLocationEnabled = true
//        var criteria = Criteria()
//        var locationManager = context!!.getSystemService(LOCATION_SERVICE) as LocationManager
//        var provider = locationManager.getBestProvider(criteria, true)
//        var location = locationManager.getLastKnownLocation(provider)
//        var latitude = location.latitude
//        var longitude = location.longitude




//         latitude and longitude
        val latitude = 17.385044
        val longitude = 78.486671

        val marker = MarkerOptions().position(LatLng(latitude,longitude)).title("hello maps")

        marker.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED))

        map.addMarker(marker)

        val cameraPosition = CameraPosition.builder().target(LatLng(latitude,longitude)).zoom(12f).build()
        map.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition))


    }

    private fun backFragment() {
        val manager = (context as AppCompatActivity).supportFragmentManager
        manager.popBackStackImmediate()
    }


    fun sendCategoryItem(category: Observables.ComplaintType) {


        this.MyCategory = category
        Log.d("here", "i am here 1")
        Log.d("here", MyCategory.toString())


    }


    fun getAllData(){

        val latitude = 17.4
        val longitude = 78.4

//        LocationUtils().getInstance(appContext)
//        LocationUtils().getLocation().observe(this, Observer {loc: Location? ->
//            location = loc!!
//            // Yay! location recived. Do location related work here
//            Log.i(TAG,"Location: ${location.latitude}  ${location.longitude}")
//
//        })

        var typename = MyCategory!!.typeName.toString()


        val call = myAPI.checkExistingComplain(typename,longitude.toString(), latitude.toString() )
        Log.d("T", typename)
        Log.d("Lo", longitude.toString())
        Log.d("La", latitude.toString())




        call.enqueue(object : retrofit2.Callback<Observables.checkExistingResult> {
            override fun onFailure(call: Call<Observables.checkExistingResult>?, t: Throwable?) {

                Log.d("NO", t!!.message)


            }

            override fun onResponse(call: Call<Observables.checkExistingResult>?, response: Response<Observables.checkExistingResult>?) {

                if(response?.body()?.Complain ==null) {

                    setExistingData(response!!.body()!!.Complain)
                    descriptionFragment()
//                    notifyDataSetChanged()

                }

                else if(response!!.code() == 200){



                    Log.d("YES", "200")
                    Log.d("response", response.body().toString())


                    objectComplaint = response.body()!!.Complain

                    Log.d("got the complaint",objectComplaint.toString())
                    setExistingData(objectComplaint)



                    existPopup()
                }

                else if(response!!.code() == 201){

                    Log.d("response", response.body().toString())

//                    alreadyMadeComplaintPopup()
                }

                else{
                    descriptionFragment()
                }

                val item = objectComplaint

                listener?.onLocationFragmentInteraction(item)

            }
        })
    }


    interface OnLocationFragmentInteractionListener {
        // TODO: Update argument type and name
        fun onLocationFragmentInteraction(item: Observables.Complaint?)
    }

    override fun onAttach(context: Context) {
        super.onAttach(context)
        if (context is OnLocationFragmentInteractionListener) {
            listener = context as OnLocationFragmentInteractionListener
        } else {
            throw RuntimeException("$context must implement OnLocationFragmentInteractionListener")
        }
    }

    fun setExistingData(test: Observables.Complaint) {
        objectComplaint = test
    }

    //opening up the checkExisting popup

    private fun existPopup(){
        val fm = activity!!.supportFragmentManager
        val dialog = PopupDialog() // creating new object
        dialog.show(fm, "dialog")
    }



    private fun descriptionFragment() {
        val dFragment= Category_Description()
        val lFragment = LocationFragment()
        val manager = (context as AppCompatActivity).supportFragmentManager
        val transaction =  manager.beginTransaction()
        transaction.replace(
            R.id.location_screen,
            dFragment
        ) // give your fragment container id in first parameter
        transaction.show(dFragment)
        transaction.hide(lFragment)
        transaction.isAddToBackStackAllowed
        transaction.addToBackStack(lFragment.fragmentManager.toString())  // if written, this transaction will be added to backstack
        transaction.commit()
    }



}

如果有人可以帮助我，我将非常感激。

Answer 1

这里看这个例子：GpsUtils

它很容易说明。只需从片段中调用GpsUtils.getInstance（）。findDeviceLocation（activity），然后访问GpsUtils类中的静态纬度和经度变量即可为您提供当前位置。注意：关于此类的设计，还有很多改进的余地，但确实做得很好。