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January 22, 2019 14:24
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Android: Retrieve city from current device location
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<manifest xmlns:android="http://schemas.android.com/apk/res/android" | |
package="ua.naiksoftware.citynametester"> | |
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/> | |
<uses-permission android:name="android.permission.INTERNET"/> | |
<application android:allowBackup="true" | |
android:label="@string/app_name" | |
android:icon="@mipmap/ic_launcher" | |
android:roundIcon="@mipmap/ic_launcher_round" | |
android:supportsRtl="true" | |
android:theme="@style/AppTheme"> | |
<activity android:name=".MainActivity"> | |
<intent-filter> | |
<action android:name="android.intent.action.MAIN"/> | |
<action android:name="android.intent.action.VIEW"/> | |
<category android:name="android.intent.category.LAUNCHER"/> | |
</intent-filter> | |
</activity> | |
</application> | |
</manifest> |
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import android.Manifest | |
import android.content.Context | |
import android.content.pm.PackageManager | |
import android.location.Geocoder | |
import android.location.LocationManager | |
import android.os.Bundle | |
import android.widget.TextView | |
import androidx.appcompat.app.AlertDialog | |
import androidx.appcompat.app.AppCompatActivity | |
import androidx.core.app.ActivityCompat | |
import androidx.core.content.ContextCompat | |
import java.io.IOException | |
import java.util.* | |
import android.content.Intent | |
import android.provider.Settings | |
class MainActivity : AppCompatActivity() { | |
companion object { | |
const val RC_PERMISSION_LOCATION = 1234 | |
} | |
lateinit var textView: TextView | |
lateinit var locationManager: LocationManager | |
override fun onCreate(savedInstanceState: Bundle?) { | |
super.onCreate(savedInstanceState) | |
setContentView(R.layout.activity_main) | |
textView = findViewById(R.id.text) | |
locationManager = getSystemService(Context.LOCATION_SERVICE) as LocationManager | |
} | |
override fun onStart() { | |
super.onStart() | |
requestLocationPermissions() | |
} | |
private fun requestLocationPermissions() { | |
if (!checkLocationEnabled()) return | |
if (ContextCompat.checkSelfPermission( | |
this, | |
Manifest.permission.ACCESS_FINE_LOCATION | |
) != PackageManager.PERMISSION_GRANTED | |
) { | |
if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.ACCESS_FINE_LOCATION)) { | |
AlertDialog.Builder(this) | |
.setMessage(R.string.location_request_reason) | |
.setNegativeButton(R.string.cancel, null) | |
.setPositiveButton(R.string.ok) { _, _ -> | |
ActivityCompat.requestPermissions( | |
this, | |
arrayOf(Manifest.permission.ACCESS_FINE_LOCATION), | |
RC_PERMISSION_LOCATION | |
) | |
} | |
.show() | |
} else { | |
ActivityCompat.requestPermissions( | |
this, | |
arrayOf(Manifest.permission.ACCESS_FINE_LOCATION), | |
RC_PERMISSION_LOCATION | |
) | |
} | |
} else { | |
retrieveSuggestions() | |
} | |
} | |
private fun checkLocationEnabled(): Boolean { | |
var gpsEnabled = false | |
var networkEnabled = false | |
try { | |
gpsEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER) | |
} catch (ex: Exception) { | |
} | |
try { | |
networkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER) | |
} catch (ex: Exception) { | |
} | |
if (!gpsEnabled && !networkEnabled) { | |
AlertDialog.Builder(this) | |
.setMessage(getString(R.string.enable_location_message)) | |
.setPositiveButton(R.string.ok) {_, _ -> | |
startActivity(Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS)) | |
} | |
.setNegativeButton(R.string.cancel, null).show() | |
return false | |
} | |
return true | |
} | |
override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) { | |
if (requestCode == RC_PERMISSION_LOCATION) { | |
if ((grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED)) { | |
retrieveSuggestions() | |
} else { | |
textView.setText(R.string.location_permissions_denied) | |
} | |
} | |
} | |
private fun retrieveSuggestions() { | |
val location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER) | |
if (location == null) { | |
textView.setText(R.string.last_location_empty_message) | |
} else { | |
retrieveCityName(location.latitude, location.longitude) | |
} | |
} | |
private fun retrieveCityName(lat: Double, lng: Double) { | |
val geoCoder = Geocoder(this, Locale.getDefault()) | |
val text = StringBuilder() | |
try { | |
val addresses = geoCoder.getFromLocation(lat, lng, 1) | |
if (addresses != null) { | |
text.append(addresses[0].locality) | |
} else { | |
text.append("No Address returned!") | |
} | |
} catch (e: IOException) { | |
e.printStackTrace() | |
text.append("Can not get address! " + e.toString()) | |
} | |
textView.text = text.toString() | |
} | |
} |
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