对于这方面的答案，我看起来很高很低，没有人，在任何论坛问题上都能提供帮助。我搜索过这些教程。 API Guide说：
仅当启用“我的位置”图层时，“我的位置”按钮才会显示在屏幕的右上角。
所以我一直在寻找这个我的位置图层，但一直找不到任何东西。如何在Google地图上显示我的位置？
API指南完全没错（真的是谷歌吗？）。使用Maps API v2，您无需启用自己展示的图层，只需调用您使用地图创建的GoogleMaps实例即可。
Google提供的实际文档可为您提供答案。你只需要
// map is a GoogleMap object
map.isMyLocationEnabled = true
// map is a GoogleMap object
map.setMyLocationEnabled(true);
并观看魔术的发生。
只需确保您在API级别23（M）或更高级别上拥有位置权限和requested it at runtime
Java代码：
public class MapActivity extends FragmentActivity implements LocationListener {
GoogleMap googleMap;
LatLng myPosition;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map);
// Getting reference to the SupportMapFragment of activity_main.xml
SupportMapFragment fm = (SupportMapFragment)
getSupportFragmentManager().findFragmentById(R.id.map);
// Getting GoogleMap object from the fragment
googleMap = fm.getMap();
// Enabling MyLocation Layer of Google Map
googleMap.setMyLocationEnabled(true);
// Getting LocationManager object from System Service LOCATION_SERVICE
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
// Creating a criteria object to retrieve provider
Criteria criteria = new Criteria();
// Getting the name of the best provider
String provider = locationManager.getBestProvider(criteria, true);
// Getting Current Location
Location location = locationManager.getLastKnownLocation(provider);
if (location != null) {
// Getting latitude of the current location
double latitude = location.getLatitude();
// Getting longitude of the current location
double longitude = location.getLongitude();
// Creating a LatLng object for the current location
LatLng latLng = new LatLng(latitude, longitude);
myPosition = new LatLng(latitude, longitude);
googleMap.addMarker(new MarkerOptions().position(myPosition).title("Start"));
}
}
}
activity_map.xml：
<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:map="http://schemas.android.com/apk/res-auto"
android:id="@+id/map"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
class="com.google.android.gms.maps.SupportMapFragment"/>
您将获得当前位置的蓝色圆圈。
从android 6.0你需要检查用户权限，如果你想使用GoogleMap.setMyLocationEnabled(true)你将得到Call requires permission which may be rejected by user错误
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
mMap.setMyLocationEnabled(true);
} else {
// Show rationale and request permission.
}
如果您想了解更多信息，请查看google map docs
要显示“我的位置”按钮，您必须致电
map.getUiSettings().setMyLocationButtonEnabled(true);
在您的GoogleMap对象上。
在你的GoogleMap.setMyLocationEnabled(true)中调用Activity，并在Manifest中添加这两行代码：
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
在启用“我的位置”图层之前，您必须向用户请求位置许可。此示例不包含位置权限请求。
为了简化，就代码行而言，可以使用库EasyPermissions来进行位置许可的请求。
然后按照The My Location Layer官方文档的示例，我的代码对包含Google服务的所有Android版本的工作方式如下。
OnMyLocationClickListener和OnMyLocationButtonClickListener。implementation 'pub.devrel:easypermissions:2.0.1'onRequestPermissionsResult()中将结果转发给EasyPermissions
EasyPermissions.onRequestPermissionsResult(requestCode, permissions, grantResults, this);requestLocationPermission()的回复进行操作requestLocationPermission()并将监听器设置为onMapReady()。public class MapsActivity extends FragmentActivity implements
OnMapReadyCallback,
GoogleMap.OnMyLocationClickListener,
GoogleMap.OnMyLocationButtonClickListener {
private final int REQUEST_LOCATION_PERMISSION = 1;
private GoogleMap mMap;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
requestLocationPermission();
mMap.setOnMyLocationButtonClickListener(this);
mMap.setOnMyLocationClickListener(this);
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
// Forward results to EasyPermissions
EasyPermissions.onRequestPermissionsResult(requestCode, permissions, grantResults, this);
}
@SuppressLint("MissingPermission")
@AfterPermissionGranted(REQUEST_LOCATION_PERMISSION)
public void requestLocationPermission() {
String[] perms = {Manifest.permission.ACCESS_FINE_LOCATION};
if(EasyPermissions.hasPermissions(this, perms)) {
mMap.setMyLocationEnabled(true);
Toast.makeText(this, "Permission already granted", Toast.LENGTH_SHORT).show();
}
else {
EasyPermissions.requestPermissions(this, "Please grant the location permission", REQUEST_LOCATION_PERMISSION, perms);
}
}
@Override
public boolean onMyLocationButtonClick() {
Toast.makeText(this, "MyLocation button clicked", Toast.LENGTH_SHORT).show();
return false;
}
@Override
public void onMyLocationClick(@NonNull Location location) {
Toast.makeText(this, "Current location:\n" + location, Toast.LENGTH_LONG).show();
}
}