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MyLocationDemoActivity.kt
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MyLocationDemoActivity.kt
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// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.example.kotlindemos
import android.Manifest
import android.annotation.SuppressLint
import android.content.pm.PackageManager
import android.location.Location
import android.os.Bundle
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import androidx.core.app.ActivityCompat
import androidx.core.app.ActivityCompat.OnRequestPermissionsResultCallback
import androidx.core.content.ContextCompat
import com.example.kotlindemos.PermissionUtils.PermissionDeniedDialog.Companion.newInstance
import com.example.kotlindemos.PermissionUtils.isPermissionGranted
import com.google.android.gms.maps.GoogleMap
import com.google.android.gms.maps.GoogleMap.OnMyLocationButtonClickListener
import com.google.android.gms.maps.GoogleMap.OnMyLocationClickListener
import com.google.android.gms.maps.OnMapReadyCallback
import com.google.android.gms.maps.SupportMapFragment
/**
* This demo shows how GMS Location can be used to check for changes to the users location. The
* "My Location" button uses GMS Location to set the blue dot representing the users location.
* Permission for [Manifest.permission.ACCESS_FINE_LOCATION] and [Manifest.permission.ACCESS_COARSE_LOCATION]
* are requested at run time. If either permission is not granted, the Activity is finished with an error message.
*/
class MyLocationDemoActivity : AppCompatActivity(),
OnMyLocationButtonClickListener,
OnMyLocationClickListener, OnMapReadyCallback,
OnRequestPermissionsResultCallback {
/**
* Flag indicating whether a requested permission has been denied after returning in
* [.onRequestPermissionsResult].
*/
private var permissionDenied = false
private lateinit var map: GoogleMap
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.my_location_demo)
val mapFragment =
supportFragmentManager.findFragmentById(R.id.map) as SupportMapFragment?
mapFragment?.getMapAsync(this)
}
override fun onMapReady(googleMap: GoogleMap) {
map = googleMap
googleMap.setOnMyLocationButtonClickListener(this)
googleMap.setOnMyLocationClickListener(this)
enableMyLocation()
}
/**
* Enables the My Location layer if the fine location permission has been granted.
*/
@SuppressLint("MissingPermission")
private fun enableMyLocation() {
// [START maps_check_location_permission]
// 1. Check if permissions are granted, if so, enable the my location layer
if (ContextCompat.checkSelfPermission(
this,
Manifest.permission.ACCESS_FINE_LOCATION
) == PackageManager.PERMISSION_GRANTED || ContextCompat.checkSelfPermission(
this,
Manifest.permission.ACCESS_COARSE_LOCATION
) == PackageManager.PERMISSION_GRANTED
) {
map.isMyLocationEnabled = true
return
}
// 2. If if a permission rationale dialog should be shown
if (ActivityCompat.shouldShowRequestPermissionRationale(
this,
Manifest.permission.ACCESS_FINE_LOCATION
) || ActivityCompat.shouldShowRequestPermissionRationale(
this,
Manifest.permission.ACCESS_COARSE_LOCATION
)
) {
PermissionUtils.RationaleDialog.newInstance(
LOCATION_PERMISSION_REQUEST_CODE, true
).show(supportFragmentManager, "dialog")
return
}
// 3. Otherwise, request permission
ActivityCompat.requestPermissions(
this,
arrayOf(
Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.ACCESS_COARSE_LOCATION
),
LOCATION_PERMISSION_REQUEST_CODE
)
// [END maps_check_location_permission]
}
override fun onMyLocationButtonClick(): Boolean {
Toast.makeText(this, "MyLocation button clicked", Toast.LENGTH_SHORT)
.show()
// Return false so that we don't consume the event and the default behavior still occurs
// (the camera animates to the user's current position).
return false
}
override fun onMyLocationClick(location: Location) {
Toast.makeText(this, "Current location:\n$location", Toast.LENGTH_LONG)
.show()
}
// [START maps_check_location_permission_result]
override fun onRequestPermissionsResult(
requestCode: Int,
permissions: Array<String>,
grantResults: IntArray
) {
if (requestCode != LOCATION_PERMISSION_REQUEST_CODE) {
super.onRequestPermissionsResult(
requestCode,
permissions,
grantResults
)
return
}
if (isPermissionGranted(
permissions,
grantResults,
Manifest.permission.ACCESS_FINE_LOCATION
) || isPermissionGranted(
permissions,
grantResults,
Manifest.permission.ACCESS_COARSE_LOCATION
)
) {
// Enable the my location layer if the permission has been granted.
enableMyLocation()
} else {
// Permission was denied. Display an error message
// [START_EXCLUDE]
// Display the missing permission error dialog when the fragments resume.
permissionDenied = true
// [END_EXCLUDE]
}
}
// [END maps_check_location_permission_result]
override fun onResumeFragments() {
super.onResumeFragments()
if (permissionDenied) {
// Permission was not granted, display error dialog.
showMissingPermissionError()
permissionDenied = false
}
}
/**
* Displays a dialog with error message explaining that the location permission is missing.
*/
private fun showMissingPermissionError() {
newInstance(true).show(supportFragmentManager, "dialog")
}
companion object {
/**
* Request code for location permission request.
*
* @see .onRequestPermissionsResult
*/
private const val LOCATION_PERMISSION_REQUEST_CODE = 1
}
}