八、使用谷歌的定位服务


name="app_name">LocationAlarm
name="title_activity_maps">Map
name="Settings">Settings
name="PREFS_NAME">LocationAlarmFile


val sharedPref = this?.getSharedPreferences(getString(R.string.PREFS_NAME),Context.MODE_PRIVATE) ?: return with(sharedPref.edit()){ putString("userLat", Lat?.text.toString())
putString("userLang",Lang?.text.toString())
commit()


val sharedPref =
this?.getSharedPreferences(getString(R.string.PREFS_NAME),
Context.MODE_PRIVATE) ?: return AlarmLat =
java.lang.Double.parseDouble(sharedPref.getString("userLat",
"13.07975"))
AlarmLong =
java.lang.Double.parseDouble(sharedPref.getString("userLang",
"80.1798347"))


dependencies {
compile 'com.google.android.gms:play-services-location:11.8.0'
}


private fun checkLocation(): Boolean {
if(!isLocationEnabled())
Toast.makeText(this,"Please enable Location and grant permission for this app for Location",Toast.LENGTH_LONG).show()
return isLocationEnabled();
}
private fun isLocationEnabled(): Boolean {
locationManager = getSystemService(Context.LOCATION_SERVICE) as
LocationManager
return locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER) || locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)
}


class MapsActivity : AppCompatActivity(), OnMapReadyCallback ,GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, com.google.android.gms.location.LocationListener {


private lateinit var mMap: GoogleMap
private var newLat: Double? = null
private var newLang: Double? = null
private var chennai: LatLng? = null
private var AlarmLat: Double? = null
private var AlarmLong: Double? = null
private var UserLat: Double? = null
private var UserLong: Double? = null
//location variablesprivate val TAG = "MapsActivity" private lateinit var mGoogleApiClient: GoogleApiClient
private var mLocationManager: LocationManager? = null
lateinit var mLocation: Location
private var mLocationRequest: LocationRequest? = null


private val UPDATE_INTERVAL = 10000.toLong() // 10 seconds rate at
// which we would like to receive the updates
private val FASTEST_INTERVAL: LOng= 5000 // 5 seconds - rate at
// which app can handle the update lateinit var locationManager: LocationManager


override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.*activity_maps*)
// Obtain the SupportMapFragment and get notified when the map
is ready to be used. val mapFragment = *supportFragmentManager
* .findFragmentById(R.id.*map*) as SupportMapFragment
mapFragment.getMapAsync(this)
mGoogleApiClient = GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build()
mLocatiOnManager=
this.getSystemService(Context.LOCATION_SERVICE) as
LocationManager
checkLocation()
}


override fun onStart() {
super.onStart();
if (mGoogleApiClient != null) {
mGoogleApiClient.connect();
}
}


override fun onStop() {
super.onStop();
if (mGoogleApiClient.isConnected()) {
mGoogleApiClient.disconnect();
}
}


override fun onConnectionSuspended(p0: Int) {
Log.i(TAG, "Connection Suspended");
mGoogleApiClient.connect();
}


override fun onConnectionFailed(connectionResult:
ConnectionResult) {
Log.i(TAG, "Connection failed. Error: " +
connectionResult.getErrorCode());
}


override fun onConnected(p0: Bundle?) {
if (ActivityCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION) !=
PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_COARSE_LOCATION) !=
PackageManager.PERMISSION_GRANTED) {
return;
}
startLocationUpdates();


var fusedLocationProviderClient :
FusedLocationProviderClient =
LocationServices.getFusedLocationProviderClient(this);
fusedLocationProviderClient .getLastLocation()
.addOnSuccessListener(this, OnSuccessListener<Location> {
location ->
if (location != null) {
mLocation = location;
} }) }


protected fun startLocationUpdates() {
// Create the location request mLocationRequest = LocationRequest.create()
.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
.setInterval(UPDATE_INTERVAL)
.setFastestInterval(FASTEST_INTERVAL);
// Request location updates if (ActivityCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION) !=
PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_COARSE_LOCATION) !=
PackageManager.PERMISSION_GRANTED) {
return;
}
LocationServices.FusedLocationApi.requestLocationUpdates(
mGoogleApiClient, mLocationRequest, this);
}


override fun onLocationChanged(location: Location) {
val sharedPref =
this?.getSharedPreferences(getString(R.string.*PREFS_NAME*),
Context.*MODE_PRIVATE*)
?: return
AlarmLat =
java.lang.Double.parseDouble(sharedPref.getString("userLat",
"13.07975"))
AlarmLong =
java.lang.Double.parseDouble(sharedPref.getString("userLang",
"80.1798347"))
UserLat = location.latitude
UserLong = location.longitude
val AlarmLat1 = AlarmLat val AlarmLong1 = AlarmLong
val UserLat1 = UserLat
val UserLong1 = UserLong
if(AlarmLat1 != null && AlarmLong1 != null && UserLat1 != null
&& UserLong1 != null){
checkAlarmLocation(AlarmLat1,AlarmLong1,UserLat1,UserLong1)
}
}


fun checkAlarmLocation(AlarmLat : Double, AlarmLong : Double, UserLat : Double,UserLong : Double) {
Toast.makeText(this,"Check Alarm Called" + AlarmLat + "," + AlarmLong + "," + UserLat + "," + UserLong,Toast.*LENGTH_LONG* ).show()
var LatAlarm: Double
var LongAlarm: Double
var LatUser: Double
var LongUser: Double
LatAlarm = Math.round(AlarmLat * 100.0) / 100.0;
LongAlarm = Math.round(AlarmLong * 100.0) / 100.0;
LatUser = Math.round(UserLat * 100.0) / 100.0;
LongUser = Math.round(UserLong * 100.0) / 100.0;
Toast.makeText(this,"Check Alarm Called" + LatAlarm + "," + LongAlarm + "," + LatUser + "," + LongUser,Toast.*LENGTH_LONG* ).show()
if (LatAlarm == LatUser && LongAlarm == LongUser) {
Toast.makeText(this, "User has reached the area for which
alarm has been set", Toast.LENGTH_LONG).show();
}
}