这是我的android项目。该应用程序显示有关当前位置的信息 但是，应用程序始终显示该位置为空。我已经搜索了很多，但仍然无法找到解决方案或者无法实现解决方案。
这是我的MainActivity代码，
package com.learning.pranavjain.hikerswatch;
import android.Manifest;
import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.location.Address;
import android.location.Criteria;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.WindowManager;
import android.widget.TextView;
import java.io.IOException;
import java.util.List;
import java.util.Locale;
public class MainActivity extends Activity implements LocationListener {
LocationManager locationManager;
String provider;
String sLatitude;
String sLongitude;
String sAccuracy;
String sSpeed;
String sAltitude;
TextView addressTV;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//Hiding the status bar
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
provider = locationManager.getBestProvider(new Criteria(),false);
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
locationManager.requestLocationUpdates(provider,400,1,this);
location = locationManager.getLastKnownLocation(provider);
if(location==null){
Log.i("Location1","NULL1");
Toast.makeText(this,"Location not found",Toast.LENGTH_SHORT).show();
}
if(location!=null) {
onLocationChanged(location);
Log.i("Location1","Reached here");
}
}
@Override
protected void onResume() {
super.onResume();
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
locationManager.requestLocationUpdates(provider, 400, 1, this);
}
@Override
public void onLocationChanged(Location location) {
Double lat = location.getLatitude();
Double lng = location.getLongitude();
Float acc = location.getAccuracy();
Float spe = location.getSpeed();
Double alt = location.getAltitude();
Log.i("Location","reached here");
TextView latitude = (TextView) findViewById(R.id.latitude);
TextView longitude = (TextView) findViewById(R.id.longitude);
TextView accuracy = (TextView) findViewById(R.id.accuracy);
TextView speed = (TextView) findViewById(R.id.speed);
TextView altitude = (TextView) findViewById(R.id.altitude);
addressTV = (TextView) findViewById(R.id.address);
sLatitude = latitude.getText().toString();
sLongitude = longitude.getText().toString();
sAccuracy = accuracy.getText().toString();
sSpeed = speed.getText().toString();
sAltitude = altitude.getText().toString();
sLatitude += Double.toString(lat);
sLongitude += Double.toString(lng);
sAccuracy += Double.toString(acc);
sSpeed += Double.toString(spe);
sAltitude += Double.toString(alt);
latitude.setText(sLatitude);
longitude.setText(sLongitude);
accuracy.setText(sAccuracy);
speed.setText(sSpeed);
altitude.setText(sAltitude);
Geocoder geocoder = new Geocoder(getApplicationContext(), Locale.getDefault());
try {
List<Address> listAddresses = geocoder.getFromLocation(lat, lng, 1);
if (listAddresses != null && listAddresses.size() > 0 ) {
Log.i("PlaceInfo", listAddresses.get(0).toString());
String addressHolder = "";
for (int i = 0; i <= listAddresses.get(0).getMaxAddressLineIndex(); i++) {
addressHolder += listAddresses.get(0).getAddressLine(i) + "\n";
}
addressTV.setText("Address:\n" + addressHolder);
}
} catch (IOException e) {
e.printStackTrace();
}
Log.i("Location:", String.valueOf(lat));
Log.i("Location:", lng.toString());
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
protected void onPause() {
super.onPause();
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
locationManager.removeUpdates(this);
}
}
这是我的清单代码，
<?xml version="1.0" encoding="utf-8"?>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-feature android:name="android.hardware.location.network" />
<uses-feature android:name="android.hardware.location.gps" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
整个项目可在here (GitHub)
找到答案 0 :(得分：0)
getLastKnownLocation返回缓存值。它不会启用位置跟踪。因此，除非其他应用程序最近启用了位置跟踪功能，否则它将无法为您提供良好的价值并返回null。如果您想要有保证的价值，则需要通过requestLocationUpdates或requestSingleUpdate开启位置跟踪功能。这些中的任何一个都会告诉操作系统找出你当前的位置，并在完成后给你一个回调。请注意，回调可能需要一些时间才能调用 - 尤其是GPS。如果手机无法获取网络信息/ GPS卫星数据，那么它将永远不会进行回叫。
答案 1 :(得分：0)
您可以查看RxGpsService（Android服务以检索GPS位置并使用RxJava路由统计信息）。它检索RouteStats对象，其中包含当前速度，距离，经过的时间和航点。
答案 2 :(得分：-1)
为什么要尝试使用 getLastKnownLocation 。它会返回您之前的纬度和经度，并且可能需要一些时间来更新上次知道的位置。 很可能它会在您所在位置后退回null。
我只是引用你 google Fused api 获取任何类型的更新或当前位置。它非常准确。
如何在项目中融合api。请参阅我的小例子。
步骤1.将此类设为GoogleLocationService.java
public class GoogleLocationService {
private GoogleServicesCallbacks callbacks = new GoogleServicesCallbacks();
LocationUpdateListener locationUpdateListener;
Context activity;
protected GoogleApiClient mGoogleApiClient;
protected LocationRequest mLocationRequest;
public static final long UPDATE_INTERVAL_IN_MILLISECONDS = 30000;
public GoogleLocationService(Context activity, LocationUpdateListener locationUpdateListener) {
this.locationUpdateListener = locationUpdateListener;
this.activity = activity;
buildGoogleApiClient();
}
protected synchronized void buildGoogleApiClient() {
//Log.i(TAG, "Building GoogleApiClient");
mGoogleApiClient = new GoogleApiClient.Builder(activity)
.addConnectionCallbacks(callbacks)
.addOnConnectionFailedListener(callbacks)
.addApi(LocationServices.API)
.build();
createLocationRequest();
mGoogleApiClient.connect();
}
protected void createLocationRequest() {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(UPDATE_INTERVAL_IN_MILLISECONDS);
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
}
private class GoogleServicesCallbacks implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, LocationListener {
@Override
public void onConnected(Bundle bundle) {
startLocationUpdates();
}
@Override
public void onConnectionSuspended(int i) {
mGoogleApiClient.connect();
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
if (connectionResult.getErrorCode() == ConnectionResult.SERVICE_VERSION_UPDATE_REQUIRED) {
Toast.makeText(activity, "Google play service not updated", Toast.LENGTH_LONG).show();
}
locationUpdateListener.cannotReceiveLocationUpdates();
}
@Override
public void onLocationChanged(Location location) {
if (location.hasAccuracy()) {
if (location.getAccuracy() < 30) {
locationUpdateListener.updateLocation(location);
}
}
}
}
private static boolean locationEnabled(Context context) {
boolean gps_enabled = false;
LocationManager lm = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
try {
gps_enabled = lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
} catch (Exception ex) {
ex.printStackTrace();
}
return gps_enabled;
}
private boolean servicesConnected(Context context) {
return isPackageInstalled(GooglePlayServicesUtil.GOOGLE_PLAY_STORE_PACKAGE, context);
}
private boolean isPackageInstalled(String packagename, Context context) {
PackageManager pm = context.getPackageManager();
try {
pm.getPackageInfo(packagename, PackageManager.GET_ACTIVITIES);
return true;
} catch (PackageManager.NameNotFoundException e) {
e.printStackTrace();
return false;
}
}
public void startUpdates() {
/*
* Connect the client. Don't re-start any requests here; instead, wait
* for onResume()
*/
if (servicesConnected(activity)) {
if (locationEnabled(activity)) {
locationUpdateListener.canReceiveLocationUpdates();
startLocationUpdates();
} else {
locationUpdateListener.cannotReceiveLocationUpdates();
Toast.makeText(activity, "Unable to get your location.Please turn on your device Gps", Toast.LENGTH_LONG).show();
}
} else {
locationUpdateListener.cannotReceiveLocationUpdates();
Toast.makeText(activity, "Google play service not available", Toast.LENGTH_LONG).show();
}
}
//stop location updates
public void stopUpdates() {
stopLocationUpdates();
}
//start location updates
private void startLocationUpdates() {
if (checkSelfPermission(activity, ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && checkSelfPermission(activity, ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
if (mGoogleApiClient.isConnected()) {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, callbacks);
}
}
public void stopLocationUpdates() {
if (mGoogleApiClient.isConnected()) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, callbacks);
}
}
public void startGoogleApi() {
mGoogleApiClient.connect();
}
public void closeGoogleApi() {
mGoogleApiClient.disconnect();
}
}
<强>第二步。制作这个界面 LocationUpdateListener.java
public interface LocationUpdateListener {
/**
* Called immediately the service starts if the service can obtain location
*/
void canReceiveLocationUpdates();
/**
* Called immediately the service tries to start if it cannot obtain location - eg the user has disabled wireless and
*/
void cannotReceiveLocationUpdates();
/**
* Called whenever the location has changed (at least non-trivially)
* @param location
*/
void updateLocation(Location location);
/**
* Called when GoogleLocationServices detects that the device has moved to a new location.
* @param localityName The name of the locality (somewhere below street but above area).
*/
void updateLocationName(String localityName, Location location);
}
步骤3.在想要获取位置的地方使用这段代码
public class MainActivity extends ActionBarActivity {
private GoogleLocationService googleLocationService;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
googleLocationService = new GoogleLocationService(context, new LocationUpdateListener() {
@Override
public void canReceiveLocationUpdates() {
}
@Override
public void cannotReceiveLocationUpdates() {
}
//update location to our servers for tracking purpose
@Override
public void updateLocation(Location location) {
if (location != null ) {
Timber.e("updated location %1$s %2$s", location.getLatitude(), location.getLongitude());
}
}
@Override
public void updateLocationName(String localityName, Location location) {
googleLocationService.stopLocationUpdates();
}
});
googleLocationService.startUpdates();
}
@Override
public void onDestroy() {
super.onDestroy();
if (googleLocationService != null) {
googleLocationService.stopLocationUpdates();
}
}
}
希望这会对你有所帮助。
答案 3 :(得分：-1)
您可以使用此代码
<强> MainActivity.java
import android.Manifest;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentSender;
import android.content.pm.PackageManager;
import android.location.Location;
import android.net.Uri;
import android.provider.Settings;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.PendingResult;
import com.google.android.gms.common.api.ResultCallback;
import com.google.android.gms.common.api.Status;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.location.LocationSettingsRequest;
import com.google.android.gms.location.LocationSettingsResult;
import com.google.android.gms.location.LocationSettingsStates;
import com.google.android.gms.location.LocationSettingsStatusCodes;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import java.text.DateFormat;
import java.util.Date;
public class MainActivity extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener, LocationListener, OnMapReadyCallback {
private GoogleApiClient mGoogleApiClient;
private LocationRequest mLocationRequest;
private Location mCurrentLocation;
private String mLocationUpdatedDate;
private TextView mLatitude;
private TextView mLongitude;
private TextView mDateText;
private GoogleMap mMap;
private Marker mCurrentMarker;
private final int MY_PERMISSIONS_REQUEST_READ_LOCATION = 100;
private final int REQUEST_CHECK_SETTINGS = 101;
private final int REQUEST_PERMISSION_SETTING = 102;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mLatitude = (TextView) findViewById(R.id.latText);
mLongitude = (TextView) findViewById(R.id.longText);
mDateText = (TextView) findViewById(R.id.dateText);
if (mGoogleApiClient == null) {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
createLocationRequest();
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
private void fetchLocation() {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED
&& ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
mCurrentLocation = LocationServices.FusedLocationApi.getLastLocation(
mGoogleApiClient);
}
}
private void updateUI() {
if (mCurrentLocation != null) {
mLatitude.setText(String.valueOf(mCurrentLocation.getLatitude()));
mLongitude.setText(String.valueOf(mCurrentLocation.getLongitude()));
mDateText.setText(mLocationUpdatedDate);
}
}
protected void onStart() {
mGoogleApiClient.connect();
super.onStart();
}
protected void onStop() {
mGoogleApiClient.disconnect();
super.onStop();
}
@Override
public void onConnected(@Nullable Bundle bundle) {
if (ActivityCompat.checkSelfPermission(MainActivity.this,
Manifest.permission.ACCESS_COARSE_LOCATION)
!= PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(MainActivity.this,
Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this,
new String[]{Manifest.permission.ACCESS_COARSE_LOCATION},
MY_PERMISSIONS_REQUEST_READ_LOCATION);
} else {
fetchLocation();
updateUI();
startLocationUpdates();
}
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
protected void createLocationRequest() {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(10000);
mLocationRequest.setFastestInterval(5000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder()
.addLocationRequest(mLocationRequest);
PendingResult<LocationSettingsResult> result =
LocationServices.SettingsApi.checkLocationSettings(mGoogleApiClient,
builder.build());
result.setResultCallback(new ResultCallback<LocationSettingsResult>() {
@Override
public void onResult(@NonNull LocationSettingsResult result) {
final Status status = result.getStatus();
// final LocationSettingsStates = result.getLocationSettingsStates();
switch (status.getStatusCode()) {
case LocationSettingsStatusCodes.SUCCESS:
// All location settings are satisfied. The client can
// initialize location requests here.
break;
case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:
// Location settings are not satisfied, but this can be fixed
// by showing the user a dialog.
try {
// Show the dialog by calling startResolutionForResult(),
// and check the result in onActivityResult().
status.startResolutionForResult(
MainActivity.this,
REQUEST_CHECK_SETTINGS);
} catch (IntentSender.SendIntentException e) {
// Ignore the error.
}
break;
case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
// Location settings are not satisfied. However, we have no way
// to fix the settings so we won't show the dialog.
break;
}
}
});
}
protected void startLocationUpdates() {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED
&& ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
LocationServices.FusedLocationApi.requestLocationUpdates(
mGoogleApiClient, mLocationRequest, this);
}
}
protected void stopLocationUpdates() {
LocationServices.FusedLocationApi.removeLocationUpdates(
mGoogleApiClient, this);
}
@Override
protected void onPause() {
if (!mGoogleApiClient.isConnected())
stopLocationUpdates();
super.onPause();
}
@Override
protected void onResume() {
if (mGoogleApiClient.isConnected()) {
startLocationUpdates();
}
super.onResume();
}
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case MY_PERMISSIONS_REQUEST_READ_LOCATION: {
// If request is cancelled, the result arrays are empty.
// String permission = permissions[0];
for (int i = 0, len = permissions.length; i < len; i++) {
String permission = permissions[0];
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
fetchLocation();
updateUI();
} else {
if (!ActivityCompat.shouldShowRequestPermissionRationale(MainActivity.this, permission)) {
// user denied WITH never ask again
showSettingDialog();
} else if (Manifest.permission.ACCESS_COARSE_LOCATION.equals(permission)) {
showPermissionDialog();
// user denied WITHOUT never ask again
// this is a good place to explain the user
// why you need the permission and ask if he want
// to accept it (the rationale)
}
}
return;
}
}
// other 'case' lines to check for other
// permissions this app might request
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_PERMISSION_SETTING) {
// updateUI(fetchLocation());
Toast.makeText(MainActivity.this, "RequestCode = " + requestCode + " ResultCode = " + resultCode, Toast.LENGTH_SHORT).show();
}
}
@Override
public void onLocationChanged(Location location) {
mCurrentLocation = location;
mLocationUpdatedDate = DateFormat.getTimeInstance().format(new Date());
updateUI();
if (mCurrentMarker != null) {
mCurrentMarker.remove();
}
if (mMap != null) {
/* LatLng currentPosition = new LatLng(mCurrentLocation.getLatitude(), mCurrentLocation.getLongitude());
mMap.addMarker(new MarkerOptions().position(currentPosition).title("Myself"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(currentPosition));*/
LatLng latLng = new LatLng(mCurrentLocation.getLatitude(), mCurrentLocation.getLongitude());
mCurrentMarker = mMap.addMarker(new MarkerOptions().position(latLng).title("Abhishek").icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_BLUE)));
// Showing the current location in Google Map
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
// Zoom in the Google Map
mMap.animateCamera(CameraUpdateFactory.zoomTo(20));
}
}
private void showPermissionDialog() {
final AlertDialog dialog = new AlertDialog.Builder(MainActivity.this).create();
dialog.setButton(AlertDialog.BUTTON_POSITIVE, "Ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialog.cancel();
ActivityCompat.requestPermissions(MainActivity.this,
new String[]{Manifest.permission.ACCESS_COARSE_LOCATION},
MY_PERMISSIONS_REQUEST_READ_LOCATION);
}
});
dialog.setButton(AlertDialog.BUTTON_NEGATIVE, "Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialog.cancel();
}
});
dialog.setTitle("Location explaination");
dialog.setMessage("Location permission is taken so that we can provide you with better service");
dialog.show();
}
private void showSettingDialog() {
final AlertDialog dialog = new AlertDialog.Builder(MainActivity.this).create();
dialog.setButton(AlertDialog.BUTTON_POSITIVE, "Ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
Uri uri = Uri.fromParts("package", getPackageName(), null);
intent.setData(uri);
startActivityForResult(intent, REQUEST_PERMISSION_SETTING);
dialog.cancel();
}
});
dialog.setButton(AlertDialog.BUTTON_NEGATIVE, "Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialog.cancel();
}
});
dialog.setTitle("Permission Denied");
dialog.setMessage("Please enable location from your app setting screen");
dialog.show();
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
mMap.setMyLocationEnabled(true);
}
// Add a marker in Sydney and move the camera
if(mCurrentLocation != null) {
LatLng currentPosition = new LatLng(mCurrentLocation.getLatitude(), mCurrentLocation.getLongitude());
mMap.addMarker(new MarkerOptions().position(currentPosition).title("Myself"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(currentPosition));
}
}
}
<强> activity_main
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="abhishek.com.testing.MainActivity">
<fragment
android:id="@+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="abhishek.com.testing.MapsActivity" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:gravity="center_horizontal"
android:weightSum="3">
<TextView
android:id="@+id/latText"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="1"
android:text="Latitude" />
<TextView
android:id="@+id/longText"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="1"
android:text="Longitude" />
<TextView
android:id="@+id/dateText"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="1"
android:text="Updated at"/>
</LinearLayout>
</RelativeLayout>