无需点击任何按钮，如何直接获取当前位置并将相机移动到该位置。
另外，我发现地图的右上方有一个按钮。单击它时，它将转到当前位置。单击该按钮时如何获取返回的位置？
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128309 次
5 回答
92
make sure you have these permissions:
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
Then make some activity and register a LocationListener
package com.example.location;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.View;
import com.actionbarsherlock.app.SherlockFragmentActivity;
import com.google.android.gms.maps.CameraUpdate;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
public class LocationActivity extends SherlockFragmentActivity implements LocationListener {
private GoogleMap map;
private LocationManager locationManager;
private static final long MIN_TIME = 400;
private static final float MIN_DISTANCE = 1000;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.map);
map = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, MIN_TIME, MIN_DISTANCE, this); //You can also use LocationManager.GPS_PROVIDER and LocationManager.PASSIVE_PROVIDER
}
@Override
public void onLocationChanged(Location location) {
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(latLng, 10);
map.animateCamera(cameraUpdate);
locationManager.removeUpdates(this);
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) { }
@Override
public void onProviderEnabled(String provider) { }
@Override
public void onProviderDisabled(String provider) { }
}
map.xml
<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.SupportMapFragment"/>
于 2012-12-16T21:51:37.523 回答
32
上面的答案不是根据 Google Doc 在 Google api v2 中引用的位置跟踪的内容。
我只是按照官方教程结束了这个类，它正在获取当前位置并在我得到它后立即将地图居中。
您可以扩展此类以使 LocationReciever 具有定期位置更新。我刚刚在 api level 7 上执行了这段代码
http://developer.android.com/training/location/retrieve-current.html
就这样吧。
import android.app.Activity;
import android.app.Dialog;
import android.content.Intent;
import android.content.IntentSender;
import android.location.Location;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.support.v4.app.FragmentActivity;
import android.util.Log;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesClient;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.location.LocationClient;
import com.google.android.gms.maps.CameraUpdate;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnMapLongClickListener;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
public class MainActivity extends FragmentActivity implements
GooglePlayServicesClient.ConnectionCallbacks,
GooglePlayServicesClient.OnConnectionFailedListener{
private SupportMapFragment mapFragment;
private GoogleMap map;
private LocationClient mLocationClient;
/*
* Define a request code to send to Google Play services
* This code is returned in Activity.onActivityResult
*/
private final static int CONNECTION_FAILURE_RESOLUTION_REQUEST = 9000;
// Define a DialogFragment that displays the error dialog
public static class ErrorDialogFragment extends DialogFragment {
// Global field to contain the error dialog
private Dialog mDialog;
// Default constructor. Sets the dialog field to null
public ErrorDialogFragment() {
super();
mDialog = null;
}
// Set the dialog to display
public void setDialog(Dialog dialog) {
mDialog = dialog;
}
// Return a Dialog to the DialogFragment.
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
return mDialog;
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
mLocationClient = new LocationClient(this, this, this);
mapFragment = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map));
map = mapFragment.getMap();
map.setMyLocationEnabled(true);
}
/*
* Called when the Activity becomes visible.
*/
@Override
protected void onStart() {
super.onStart();
// Connect the client.
if(isGooglePlayServicesAvailable()){
mLocationClient.connect();
}
}
/*
* Called when the Activity is no longer visible.
*/
@Override
protected void onStop() {
// Disconnecting the client invalidates it.
mLocationClient.disconnect();
super.onStop();
}
/*
* Handle results returned to the FragmentActivity
* by Google Play services
*/
@Override
protected void onActivityResult(
int requestCode, int resultCode, Intent data) {
// Decide what to do based on the original request code
switch (requestCode) {
case CONNECTION_FAILURE_RESOLUTION_REQUEST:
/*
* If the result code is Activity.RESULT_OK, try
* to connect again
*/
switch (resultCode) {
case Activity.RESULT_OK:
mLocationClient.connect();
break;
}
}
}
private boolean isGooglePlayServicesAvailable() {
// Check that Google Play services is available
int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
// If Google Play services is available
if (ConnectionResult.SUCCESS == resultCode) {
// In debug mode, log the status
Log.d("Location Updates", "Google Play services is available.");
return true;
} else {
// Get the error dialog from Google Play services
Dialog errorDialog = GooglePlayServicesUtil.getErrorDialog( resultCode,
this,
CONNECTION_FAILURE_RESOLUTION_REQUEST);
// If Google Play services can provide an error dialog
if (errorDialog != null) {
// Create a new DialogFragment for the error dialog
ErrorDialogFragment errorFragment = new ErrorDialogFragment();
errorFragment.setDialog(errorDialog);
errorFragment.show(getSupportFragmentManager(), "Location Updates");
}
return false;
}
}
/*
* Called by Location Services when the request to connect the
* client finishes successfully. At this point, you can
* request the current location or start periodic updates
*/
@Override
public void onConnected(Bundle dataBundle) {
// Display the connection status
Toast.makeText(this, "Connected", Toast.LENGTH_SHORT).show();
Location location = mLocationClient.getLastLocation();
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(latLng, 17);
map.animateCamera(cameraUpdate);
}
/*
* Called by Location Services if the connection to the
* location client drops because of an error.
*/
@Override
public void onDisconnected() {
// Display the connection status
Toast.makeText(this, "Disconnected. Please re-connect.",
Toast.LENGTH_SHORT).show();
}
/*
* Called by Location Services if the attempt to
* Location Services fails.
*/
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
/*
* Google Play services can resolve some errors it detects.
* If the error has a resolution, try sending an Intent to
* start a Google Play services activity that can resolve
* error.
*/
if (connectionResult.hasResolution()) {
try {
// Start an Activity that tries to resolve the error
connectionResult.startResolutionForResult(
this,
CONNECTION_FAILURE_RESOLUTION_REQUEST);
/*
* Thrown if Google Play services canceled the original
* PendingIntent
*/
} catch (IntentSender.SendIntentException e) {
// Log the error
e.printStackTrace();
}
} else {
Toast.makeText(getApplicationContext(), "Sorry. Location services not available to you", Toast.LENGTH_LONG).show();
}
}
}
于 2013-05-31T19:01:41.603 回答
10
我正在解释，假设您已经实现了map-v2 ，如何获取当前位置并直接将相机移动到当前位置。更多详细信息，您可以参考官方文档。
在 gradle 中添加位置服务
implementation "com.google.android.gms:play-services-location:11.0.1"
在清单文件中添加位置权限
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
确保您要求 RunTimePermission。我正在为此使用Ask-Permission。它易于使用。
现在参考下面的代码来获取当前位置并将其显示在地图上。
private FusedLocationProviderClient mFusedLocationProviderClient;
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mFusedLocationProviderClient = LocationServices
.getFusedLocationProviderClient(getActivity());
}
private void getDeviceLocation() {
try {
if (mLocationPermissionGranted) {
Task<Location> locationResult = mFusedLocationProviderClient.getLastLocation();
locationResult.addOnCompleteListener(new OnCompleteListener<Location>() {
@Override
public void onComplete(@NonNull Task<Location> task) {
if (task.isSuccessful()) {
// Set the map's camera position to the current location of the device.
Location location = task.getResult();
LatLng currentLatLng = new LatLng(location.getLatitude(),
location.getLongitude());
CameraUpdate update = CameraUpdateFactory.newLatLngZoom(currentLatLng,
DEFAULT_ZOOM);
googleMap.moveCamera(update);
}
}
});
}
} catch (SecurityException e) {
Log.e("Exception: %s", e.getMessage());
}
}
当用户授予位置权限时调用上述getDeviceLocation()方法
private void updateLocationUI() {
if (googleMap == null) {
return;
}
try {
if (mLocationPermissionGranted) {
googleMap.setMyLocationEnabled(true);
googleMap.getUiSettings().setMyLocationButtonEnabled(true);
getDeviceLocation();
} else {
googleMap.setMyLocationEnabled(false);
googleMap.getUiSettings().setMyLocationButtonEnabled(false);
}
} catch (SecurityException e) {
Log.e("Exception: %s", e.getMessage());
}
}
于 2017-11-10T07:15:11.577 回答
1
只需将 moveCamera 更改为 animateCamera ，如下所示
Googlemap.animateCamera(CameraUpdateFactory.newLatLngZoom(locate, 16F))
于 2019-10-04T09:36:39.877 回答
0
我的答案是针对那些在应用程序启动时正在寻找当前位置缩放动画的人。并获取当前位置的位置。
如果有什么遗漏，请在评论中告诉我。
注意：-我假设您已授予所有运行时位置权限。
@Override
public void onMapReady(GoogleMap googleMap) {
MapsInitializer.initialize(this);
mMap = googleMap;
getData(mMap);
animateCamera();
}
getData 方法返回地图中理想位置的 lat lng。所以基本上最后相机缩放动画在当前位置变得理想。所以它给出了当前位置 lat lng。
private void getData(GoogleMap mMap) {
mMap.setOnCameraIdleListener(new GoogleMap.OnCameraIdleListener() {
@Override
public void onCameraIdle() {
LatLng center = mMap.getCameraPosition().target;
String sLatitude = String.format("%.6f", center.latitude);
String sLongitude = String.format("%.6f", center.longitude);
StringBuilder mLatLng = new StringBuilder();
mLatLng.append(sLatitude);
mLatLng.append("°");
mLatLng.append(" ");
mLatLng.append(sLongitude);
mLatLng.append("°");
binding.latLng.setText(mLatLng);
}
});
private void animateCamera() {
Location location = getLastKnownLocation();
if (location != null) {
mMap.setMyLocationEnabled(true);
mMap.getUiSettings().setMyLocationButtonEnabled(true);
mMap.getUiSettings().setAllGesturesEnabled(true);
//delay is for after map loaded animation starts
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(location.getLatitude(), location.getLongitude()), 15));
}
}, 2000);
}
}
这将返回最佳位置提供者
private Location getLastKnownLocation() {
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
List<String> providers = locationManager.getProviders(true);
Location bestLocation = null;
for (String provider : providers) {
@SuppressLint("MissingPermission") Location l = locationManager.getLastKnownLocation(provider);
if (l == null) {
continue;
}
if (bestLocation == null || l.getAccuracy() < bestLocation.getAccuracy()) {
// Found best last known location: %s", l);
bestLocation = l;
}
}
return bestLocation;
}
于 2021-06-29T13:02:35.163 回答