我已经成功开发了一个程序来在用户旅行时更新标记，但文本只会说＆＃34;当前位置＆＃34;
我还想在点击时向用户填充带有地址信息的标记。下面是一些强调我的意图的代码片段，任何帮助将不胜感激！谢谢
这是我目前的MapsActivity.java
import android.Manifest;
import android.content.pm.PackageManager;
import android.graphics.Camera;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.os.Build;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.support.v4.content.ContextCompat;
import android.view.View;
import android.widget.EditText;
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.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
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.io.IOException;
import java.util.List;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
LocationListener {
private GoogleMap mMap;
private GoogleApiClient client;
private LocationRequest locationRequest;
private Location lastLocation;
private Marker currentLocationMarker;
public static final int REQUEST_LOCATION_CODE = 99;
TextView textView;
Geocoder geocoder;
List<Address> addresses;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
checkLocationPermission();
}
// 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 onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
switch(requestCode)
{
case REQUEST_LOCATION_CODE:
if(grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED)
{
//permission is granted
if(ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
if(client == null){
buildGoogleApiClient();
}
mMap.setMyLocationEnabled(true);
}
}
else {
Toast.makeText(this, "Permission Denied!", Toast.LENGTH_LONG).show();
//Permission is denied
}
return;
}
}
@Override
public void onMapReady(GoogleMap googleMap) {
Toast.makeText(this, "Click Icon in Top right for Current Location", Toast.LENGTH_LONG).show();
mMap = googleMap;
LatLng Phoenix = new LatLng(33.6056711, -112.4052378);
mMap.addMarker(new MarkerOptions().position(Phoenix).title("Default Location: Phoenix, AZ"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(Phoenix));
if(ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
buildGoogleApiClient();
mMap.setMyLocationEnabled(true);
}
}
protected synchronized void buildGoogleApiClient(){
client = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
client.connect();
}
@Override
public void onLocationChanged(Location location) {
lastLocation = location;
if(currentLocationMarker != null){
currentLocationMarker.remove();
}
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(latLng);
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE));
textView = (TextView) findViewById(R.id.textView);
geocoder = new Geocoder(this, Locale.getDefault());
try {
addresses = geocoder.getFromLocation(location.getLatitude(), location.getLongitude(), 1);
String address = addresses.get(0).getAddressLine(0);
String area = addresses.get(0).getLocality();
String city = addresses.get(0).getAdminArea();
String country = addresses.get(0).getCountryName();
String postalcode = addresses.get(0).getPostalCode();
String fullAddress = address+", "+area+", " +city+", " + country+ "," + postalcode;
textView.setText(fullAddress);
} catch (IOException e) {
e.printStackTrace();
}
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mMap.animateCamera(CameraUpdateFactory.zoomBy(10));
if(client != null){
LocationServices.FusedLocationApi.removeLocationUpdates(client, this);
}
}
@Override
public void onConnected(@Nullable Bundle bundle) {
locationRequest = new LocationRequest();
locationRequest.setInterval(1000);
locationRequest.setFastestInterval(1000);
locationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
if(ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
LocationServices.FusedLocationApi.requestLocationUpdates(client, locationRequest, this);
}
}
public boolean checkLocationPermission(){
if(ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
if(ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.ACCESS_FINE_LOCATION))
{
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_LOCATION_CODE);
}
else {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_LOCATION_CODE);
}
return false;
}
else
return true;
}
public void onZoom(View view) {
if (view.getId() == R.id.zoomIn) {
mMap.animateCamera(CameraUpdateFactory.zoomIn());
}
if (view.getId() == R.id.zoomOut) {
mMap.animateCamera(CameraUpdateFactory.zoomOut());
}
}
public void ChangeType(View view) {
if (mMap.getMapType() == GoogleMap.MAP_TYPE_NORMAL) {
mMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
Toast.makeText(this, "Satellite Map Style", Toast.LENGTH_LONG).show();
}
else if (mMap.getMapType() == GoogleMap.MAP_TYPE_SATELLITE) {
mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
Toast.makeText(this, "Hybrid Map Style", Toast.LENGTH_LONG).show();
}
else if (mMap.getMapType() == GoogleMap.MAP_TYPE_HYBRID) {
mMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN);
Toast.makeText(this, "Terrain Map Style", Toast.LENGTH_LONG).show();
}
else if (mMap.getMapType() == GoogleMap.MAP_TYPE_TERRAIN) {
mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
Toast.makeText(this, "Normal Map Style", Toast.LENGTH_LONG).show();
}
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
}
这是相应的xml文件：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/layout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/img_header" >
<fragment
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.SupportMapFragment" />
<TextView
android:id="@+id/textView"
android:layout_width="match_parent"
android:layout_height="40dp"
android:text="Test"
android:layout_centerHorizontal="true"
android:textSize="22sp"/>
</RelativeLayout>
栈跟踪
05-17 09:15:49.411 15842-15842/edu.phoenix.mbl402.week3apptt2163 E/AndroidRuntime: FATAL EXCEPTION: main
Process: edu.phoenix.mbl402.week3apptt2163, PID: 15842
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
at java.util.ArrayList.get(ArrayList.java:437)
at edu.phoenix.mbl402.week3apptt2163.MapsActivity.onLocationChanged(MapsActivity.java:139)
at com.google.android.gms.internal.location.zzay.notifyListener(Unknown Source:4)
at com.google.android.gms.common.api.internal.ListenerHolder.notifyListenerInternal(Unknown Source:8)
at com.google.android.gms.common.api.internal.ListenerHolder$zza.handleMessage(Unknown Source:16)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
最终编辑：
@Override
public void onLocationChanged(Location location) {
lastLocation = location;
if(currentLocationMarker != null){
currentLocationMarker.remove();
}
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(latLng);
markerOptions.title(getAddressForLatLng());
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE));
currentLocationMarker = mMap.addMarker((markerOptions));
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
}
public static Address getAddressForLatLng(Context context, LatLng location) {
final int MAX_RESULTS = 1;
final Geocoder geocoder = new Geocoder(context, Locale.getDefault());
Address address = new Address(Locale.getDefault());
try {
final List<Address> addresses = geocoder.getFromLocation(location.latitude, location.longitude, MAX_RESULTS);
if (addresses != null && addresses.size() != 0) {
address = addresses.get(0);
}
return address;
} catch (IOException e) {
Log.e("Geocoding", "Geocoding was not possible");
}
return address;
}
答案 0 :(得分：1)
您不必在每个位置更新中从地图中删除标记。重用现有的标记存储库引用。
Marker mMarker = mMap.addMarker(new MarkerOptions()......)
创建mMarkerObject后，在OnLocationChanged中刷新其位置
mMarker.setTitle()
mMarker.setPosition(latLng);
如果由于某种原因您仍希望实施点击操作 将接口添加到您的主要活动OnMarkerClickListener并覆盖OnMarkerClick并使用showInfoWindow或其他东西:)
编辑：对于geocrush尝试以下 - ＆gt;
public static Address getAddressForLatLng(final Context context, final LatLng location) {
final int MAX_RESULTS = 1;
final Geocoder geocoder = new Geocoder(context, Locale.getDefault());
Address address = new Address(Locale.getDefault());
try {
final List<Address> addresses = geocoder.getFromLocation(location.latitude, location.longitude, MAX_RESULTS);
if (addresses != null && addresses.size() != 0) {
address = addresses.get(0);
}
return address;
} catch (IOException e) {
Log.e("Geocoding", "Geocoding was not possible");
}
return address;
}
简化了更高效的onLocationChanged（）
版本@Override
public void onLocationChanged(Location location) {
lastLocation = location;
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
currentLocationMarker.setPosition(latLng);
// make sure following setTitle gets String from getAddressForLatLng
currentLocationMarker.setTitle(getAddressForLatLng(latLng));
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
}
答案 1 :(得分：0)
您可以使用reverse geocoding从纬度和经度中获取人类可读的地址字符串。
然后使用该地址作为标记标题，而不是"Current Location"
具体做法是：
addresses = geocoder.getFromLocation(
location.getLatitude(),
location.getLongitude(),
// In this sample, get just a single address.
1);
address = adresses[0];
markerOptions.title(address);
（遗漏错误处理等，见链接）。