我想为当前的GPS位置跟踪器创建应用。现在我想要的是如何在用户当前位置添加标记，我还想将当前的本地名称显示为标题。我怎么能实现这个目标呢？
活动代码 -
public class MyActivity extends FragmentActivity implements LocationListener {
GoogleMap googleMap;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//show error dialog if GoolglePlayServices not available
if (!isGooglePlayServicesAvailable()) {
finish();
}
setContentView(R.layout.activity_my);
SupportMapFragment supportMapFragment =
(SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.googleMap);
googleMap = supportMapFragment.getMap();
googleMap.setMyLocationEnabled(true);
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
Criteria criteria = new Criteria();
String bestProvider = locationManager.getBestProvider(criteria, true);
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.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;
}
Location location = locationManager.getLastKnownLocation(bestProvider);
if (location != null) {
onLocationChanged(location);
}
locationManager.requestLocationUpdates(bestProvider, 20000, 0, this);
}
@Override
public void onLocationChanged(Location location) {
TextView locationTv = (TextView) findViewById(R.id.latlongLocation);
double latitude = location.getLatitude();
double longitude = location.getLongitude();
LatLng latLng = new LatLng(latitude, longitude);
googleMap.addMarker(new MarkerOptions().position(latLng).icon(BitmapDescriptorFactory.fromResource(R.mipmap.ic_launcher)));
googleMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
googleMap.animateCamera(CameraUpdateFactory.zoomTo(15));
locationTv.setText("Latitude:" + latitude + ", Longitude:" + longitude);
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
private boolean isGooglePlayServicesAvailable() {
int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
if (ConnectionResult.SUCCESS == status) {
return true;
} else {
GooglePlayServicesUtil.getErrorDialog(status, this, 0).show();
return false;
}
}
}
Xml文件代码 -
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MyActivity">
<fragment
android:id="@+id/googleMap"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.SupportMapFragment"
android:layout_above="@+id/latlongLocation" />
<TextView
android:id="@+id/latlongLocation"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="bottom"
android:layout_alignParentBottom="true"
android:background="#ff058fff"
android:paddingTop="5dp"
android:paddingBottom="5dp"
android:textColor="#ffffffff"
android:paddingLeft="5dp"
android:paddingRight="5dp" />
</RelativeLayout>
答案 0 :(得分：0)
在onLocationChanged方法中添加以下代码：
mMap.addMarker(new MarkerOptions().position(new LatLng(Double.valueOf(geoPoint[0]), Double.valueOf(geoPoint[1]))).title("Place1").icon(BitmapDescriptorFactory.fromResource(R.drawable.pin_icon)));
它可能对你有帮助。
对于完整的项目你可以参考以下链接： 完整项目可在github.com/josuadas/LocationDemo
中找到答案 1 :(得分：0)
除了@kgsharathkumar answer您还可以使用以下代码获取当地名称：
private String getAddressOfLatLng() {
String addressStr = "";
List<Address> addresses = null;
Geocoder geocoder = new Geocoder(this.getActivity(), Locale.US);
try {
addresses = geocoder.getFromLocation(mLastSeenMarker.getPosition().latitude,
mLastSeenMarker.getPosition().longitude, 1);
if (addresses != null & addresses.size() > 0) {
Address address = addresses.get(0);
for (int i = 0; i < address.getMaxAddressLineIndex() - 1; i++) {
if (!TextUtils.isEmpty(address.getAddressLine(i))) {
addressStr += address.getAddressLine(i) + "\n";
}
}
int lastIndex = address.getMaxAddressLineIndex() - 1;
if (lastIndex >= 0 && lastIndex < address.getMaxAddressLineIndex()) {
addressStr += address.getAddressLine(lastIndex);
}
} else {
addressStr = getString(R.string.unknown);
}
} catch (IOException e) {
addressStr = getString(R.string.unknown);
}
return addressStr;
}
并以这种方式使用它：
Marker marker = mGoogleMap.addMarker(new MarkerOptions()
.position(new LatLng(latitude, longitude))
.title(getAddressOfLatLng(latitude, longitude))
.icon(<your_marker_icon>));
答案 2 :(得分：0)
Try this
markerOptions = new MarkerOptions();
userCurrentLat = "Your latitude";
userCurrentLong = "Your longitude";
googleMap.getUiSettings().setMapToolbarEnabled(false);
googleMap.setMyLocationEnabled(true);
Geocoder geo = new Geocoder(ActivityMapFullScreenView.this);
List<Address> addresses = null;
addresses = geo.getFromLocation(Double.parseDouble(userCurrentLat), Double.parseDouble(userCurrentLong), 1);
if (addresses.isEmpty()) {
Toast.makeText(context, "Waiting for Location", Toast.LENGTH_SHORT).show();
}
if (addresses.size() > 0) {
if (addresses.get(0).getAddressLine(3) == null) {
currentAddress = addresses.get(0).getAddressLine(0) + " " + addresses.get(0).getAddressLine(1) + " " + addresses.get(0).getAddressLine(2);
} else if (addresses.get(0).getAddressLine(2) == null) {
currentAddress = addresses.get(0).getAddressLine(0) + " " + addresses.get(0).getAddressLine(1);
} else {
currentAddress = addresses.get(0).getAddressLine(0) + " " + addresses.get(0).getAddressLine(1) + " " + addresses.get(0).getAddressLine(2).replace("null", "") + " " + addresses.get(0).getAddressLine(3);
}
// yourtextfieldname.setText(addresses.get(0).getFeatureName() + ", " + addresses.get(0).getLocality() +", " + addresses.get(0).getAdminArea() + ", " + addresses.get(0).getCountryName());
//String address = addresses.get(0).getSubLocality();
}
currentAddress.replace("null", "");
LatLng latLng = new LatLng(Double.parseDouble(userCurrentLat), Double.parseDouble(userCurrentLong));
googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, 16));
markerOptions.position(latLng);
googleMap.setInfoWindowAdapter(new CustomInfoWindowAdapter(ActivityMapFullScreenView.this));
googleMap.addMarker(markerOptions.title(getResources().getString(R.string.share_this_loc)).icon(BitmapDescriptorFactory.fromResource(R.drawable.map_green_pin))).showInfoWindow();
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