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chore: Add MyLocationDemoActivity in Kotlin (#239)
Includes region tags for: * maps_check_location_permission_result * maps_check_location_permission Also adds PermissionUtils in Kotlin Also apply following changes to Java version: * Refactor variables to remove Hungarian notation Also remove redundant schema from layout
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ApiDemos/kotlin/app/src/gms/java/com/example/kotlindemos/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.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.OnRequestPermissionsResultCallback | ||
| import androidx.core.content.ContextCompat | ||
| import com.example.kotlindemos.PermissionUtils.PermissionDeniedDialog.Companion.newInstance | ||
| import com.example.kotlindemos.PermissionUtils.isPermissionGranted | ||
| import com.example.kotlindemos.PermissionUtils.requestPermission | ||
| 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] is requested at run | ||
| * time. If the permission has not been 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 ?: return | ||
| googleMap.setOnMyLocationButtonClickListener(this) | ||
| googleMap.setOnMyLocationClickListener(this) | ||
| enableMyLocation() | ||
| } | ||
|
|
||
| /** | ||
| * Enables the My Location layer if the fine location permission has been granted. | ||
| */ | ||
| private fun enableMyLocation() { | ||
| if (!::map.isInitialized) return | ||
| // [START maps_check_location_permission] | ||
| if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) | ||
| == PackageManager.PERMISSION_GRANTED) { | ||
| map.isMyLocationEnabled = true | ||
| } else { | ||
| // Permission to access the location is missing. Show rationale and request permission | ||
| requestPermission(this, LOCATION_PERMISSION_REQUEST_CODE, | ||
| Manifest.permission.ACCESS_FINE_LOCATION, true | ||
| ) | ||
| } | ||
| // [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) { | ||
| return | ||
| } | ||
| if (isPermissionGranted(permissions, grantResults, Manifest.permission.ACCESS_FINE_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 | ||
| } | ||
| } |
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