android - 获取 fragment 中的当前位置

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Activity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

它很自我解释。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，但确实可以很好地完成工作。