需要你的帮助!! ..我正在使用谷歌 API V2 构建一个Android应用程序。我已设法在地图上放置两个标记，并到达那里。我现在主要想做的是像在Google地图中一样计算它们的距离和时间，并在它们之间绘制路径。我怎样才能做到这一点？
a-）我可以不使用JSON吗？我只知道JAVA不是java脚本所以请帮助。
b-）谁回答过，请尽可能详细说明代码注释中采取的步骤？
这是我的地图活动
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import android.app.ProgressDialog;
import android.content.Intent;
import android.content.IntentSender;
import android.graphics.Color;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.os.AsyncTask;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.util.Log;
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.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.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 com.google.android.gms.maps.model.Polyline;
import com.google.android.gms.maps.model.PolylineOptions;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
public class MapsActivity extends FragmentActivity implements
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,LocationListener,GoogleMap.OnMarkerClickListener, GoogleMap.OnInfoWindowClickListener, GoogleMap.OnMapLongClickListener, GoogleMap.OnMarkerDragListener {
private GoogleApiClient mGoogleApiClient;
private GoogleMap mMap; // Might be null if Google Play services APK is not available.
public static final String TAG = MapsActivity.class.getSimpleName();
private final static int CONNECTION_FAILURE_RESOLUTION_REQUEST = 9000;
private LocationRequest mLocationRequest;
private LocationRequest LocationDrop;
// TextView currentloc;
String filterAddress = "";
String DropoffAdress = "";
String DraggedDroppOff= "";
String dragendaddress = "";
// TextView dropOffaddress;
double currentLatitude;
double currentLongitude;
double draglat;
double draglng;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
setUpMapIfNeeded();
// tvLocInfo = (TextView) findViewById(R.id.locinfo);
mMap.setOnMapLongClickListener(this);
mMap.setOnMarkerDragListener(this);
mMap.setOnMarkerClickListener(this);
// LocationDrop = LocationRequest.create().setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY).setInterval(10 * 1000).setFastestInterval(1 * 1000);
mGoogleApiClient = new GoogleApiClient.Builder(this).addConnectionCallbacks(this).addOnConnectionFailedListener(this).addApi(LocationServices.API).build();
// Create the LocationRequest object
mLocationRequest = LocationRequest.create()
.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
.setInterval(10 * 1000) // 10 seconds, in milliseconds
.setFastestInterval(1 * 1000); // 1 second, in milliseconds
}
@Override
protected void onResume() {
super.onResume();
setUpMapIfNeeded();
mGoogleApiClient.connect();
}
protected void onPause() {
super.onPause();
if (mGoogleApiClient.isConnected()) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
mGoogleApiClient.disconnect();
}
}
/**
* Sets up the map if it is possible to do so (i.e., the Google Play services APK is correctly
* installed) and the map has not already been instantiated.. This will ensure that we only ever
* call {@link #setUpMap()} once when {@link #mMap} is not null.
* <p>
* If it isn't installed {@link SupportMapFragment} (and
* {@link com.google.android.gms.maps.MapView MapView}) will show a prompt for the user to
* install/update the Google Play services APK on their device.
* <p>
* A user can return to this FragmentActivity after following the prompt and correctly
* installing/updating/enabling the Google Play services. Since the FragmentActivity may not
* have been completely destroyed during this process (it is likely that it would only be
* stopped or paused), {@link #onCreate(Bundle)} may not be called again so we should call this
* method in {@link #onResume()} to guarantee that it will be called.
*/
private void setUpMapIfNeeded() {
// Do a null check to confirm that we have not already instantiated the map.
if (mMap == null) {
// Try to obtain the map from the SupportMapFragment.
mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
.getMap();
// Check if we were successful in obtaining the map.
if (mMap != null) {
setUpMap();
}
}
}
/**
* This is where we can add markers or lines, add listeners or move the camera. In this case, we
* just add a marker near Africa.
* <p>
* This should only be called once and when we are sure that {@link #mMap} is not null.
*/
private void setUpMap() {
// mMap.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title("Pick Me").snippet(filterAddress));
}
@Override
public void onConnected(Bundle bundle) {
Log.i(TAG, "Location services connected.");
Location location = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
if (location != null) {
// LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
handleNewLocation(location);
}
else {
handleNewLocation(location);
}
}
private void handleNewLocation(Location location) {
Log.d(TAG, location.toString());
currentLatitude = location.getLatitude();
currentLongitude = location.getLongitude();
LatLng latLng = new LatLng(currentLatitude, currentLongitude);
MarkerOptions optionsA = new MarkerOptions().position(latLng).title("Pick Me").snippet(filterAddress).icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE));
mMap.addMarker(optionsA).setDraggable(false);
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
CameraUpdate zoom=CameraUpdateFactory.zoomTo(15);
// mMap.moveCamera(center);
mMap.animateCamera(zoom);
// mMap.setOnMarkerDragListener();
Geocoder geoCoder = new Geocoder(getBaseContext(), Locale.getDefault());
try {
List<Address> addresses = geoCoder.getFromLocation(currentLatitude,currentLongitude,1);
// List<Address> dropaddress = geoCoder.getFromLocation(laterLongitut,laterlatitude,1);
if (addresses.size() > 0) {
for (int i = 0; i < addresses.get(0).getMaxAddressLineIndex(); i++)
filterAddress += addresses.get(0).getAddressLine(i) + " ";
Log.e("My current address is 2", filterAddress );
}
}catch (IOException ex){
ex.printStackTrace();
}catch (Exception e2){
e2.printStackTrace();
}
// currentloc = (TextView) findViewById(R.id.txmarker);
// currentloc.setText("Address" + filterAddress);
Log.e("My current address is 1", filterAddress);
// Log.e("My later address is 2", DropoffAdress );
Toast.makeText(getBaseContext(),filterAddress,Toast.LENGTH_LONG).show();
}
@Override
public void onConnectionSuspended(int i) {
Log.i(TAG, "Location services suspended. Please reconnect.");
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
if (connectionResult.hasResolution()) {
try {
// Start an Activity that tries to resolve the error
connectionResult.startResolutionForResult(this, CONNECTION_FAILURE_RESOLUTION_REQUEST);
} catch (IntentSender.SendIntentException e) {
e.printStackTrace();
}
} else {
Log.i(TAG, "Location services connection failed with code " + connectionResult.getErrorCode());
}
}
@Override
public void onLocationChanged(Location location) {
handleNewLocation(location);
}
public void onBackPressed(){
Intent intent = new Intent(this,TurnOnGps.class);
startActivity(intent);
setContentView(R.layout.activity_turn_on_gps);
}
@Override
public void onInfoWindowClick(Marker marker) {
marker.setTitle(filterAddress);
}
@Override
public void onMapLongClick(LatLng latLng) {
MarkerOptions options2 = new MarkerOptions();
options2.position(latLng);
options2.title("Drop ME").snippet("Dragg Me ");
options2.draggable(true);
mMap.addMarker(options2);
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
CameraUpdate zoom=CameraUpdateFactory.zoomTo(15);
Toast.makeText(getBaseContext(),"Please Drag Marker to set your Drop OFF",Toast.LENGTH_LONG).show();
// mMap.moveCamera(center);
mMap.animateCamera(zoom);
/* double updateddroplat = latLng.latitude;
double updateddroplng = latLng.longitude;
//Converting the latlngs to a string through geoencoder
LatLng latLng1 = new LatLng(updateddroplat,updateddroplng);
Geocoder geoCoder = new Geocoder(getBaseContext(), Locale.getDefault());
try {
List<Address> addresses = geoCoder.getFromLocation(updateddroplat,updateddroplng,1);
if(addresses.size() > 0){
for (int i=0; i < addresses.get(0).getMaxAddressLineIndex(); i++)
DropoffAdress += addresses.get(0).getAddressLine(i) + "";
Log.e("My DroppOff Location is" , DropoffAdress);
}
}catch (IOException ex){
ex.printStackTrace();
}catch (Exception e2){
e2.printStackTrace();
}
Log.e("My DropOff Location is" , DropoffAdress);
Toast.makeText(getBaseContext(),DropoffAdress,Toast.LENGTH_LONG).show();
*/
}
@Override
public void onMarkerDragStart(Marker marker) {
marker.setSnippet("Please Drag me to set your Drop OFF");
}
@Override
public void onMarkerDrag(Marker marker) {
}
@Override
public void onMarkerDragEnd(Marker marker) {
DropoffAdress = dragendaddress;
Log.e("My DroppOff Location is" , DraggedDroppOff);
LatLng dragposition = marker.getPosition();
draglat = dragposition.latitude;
draglng = dragposition.longitude;
LatLng latLng1 = new LatLng(draglat, draglng);
marker.getId();
// marker.getSnippet();
marker.setSnippet(dragendaddress);
marker.setTitle("Drop ME");
Geocoder geoCoder = new Geocoder(getBaseContext(), Locale.getDefault());
try {
List<Address> addresses = geoCoder.getFromLocation(draglat,draglng,1);
if(addresses.size() > 0){
for (int i=0; i < addresses.get(0).getMaxAddressLineIndex(); i++){
dragendaddress += addresses.get(0).getAddressLine(i) + "";
Log.e("My DroppOff Location is", dragendaddress);
}
Toast.makeText(getBaseContext(),dragendaddress,Toast.LENGTH_LONG).show();
}
}catch (IOException ex){
ex.printStackTrace();
}catch (Exception e2){
e2.printStackTrace();
}
}
@Override
public boolean onMarkerClick(Marker marker ) {
Log.e("am in markerclick event","");
String Title = marker.getTitle();
String Snippet = marker.getSnippet();
Log.e("I am in onMarkerClick", Title);
if(Title.equals("Pick Me")){
marker.setSnippet(filterAddress);
Toast.makeText(getBaseContext(),filterAddress,Toast.LENGTH_LONG).show();
Log.e("I am in onMarkerClick", Title);
}else if(Title.equals("Drop ME")){
marker.setSnippet(dragendaddress);
Toast.makeText(getBaseContext(),dragendaddress,Toast.LENGTH_LONG).show();
}
try {
Polyline polyline = mMap.addPolyline(new PolylineOptions().add(new LatLng(currentLatitude, currentLongitude), new LatLng(draglat, draglng)).width(10).color(Color.RED));
}catch (Exception e){
e.printStackTrace();
}
return false;
}
答案 0 :(得分：0)
计算距离::
public float distance (LatLng point1, LatLng point2 )
{
double earthRadius = 3958.75;
double latDiff = Math.toRadians(point2.latitude - point1.latitude);
double lngDiff = Math.toRadians(point2.longitude - point2.longitude);
double a = Math.sin(latDiff /2) * Math.sin(latDiff /2) +
Math.cos(Math.toRadians(point1.latitude)) * Math.cos(Math.toRadians(point2.latitude)) *
Math.sin(lngDiff /2) * Math.sin(lngDiff /2);
double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
double distance = earthRadius * c;
int meterConversion = 1609;
return new Float(distance).floatValue();
}
并绘制一条线将点添加到列表中然后使用折线函数。
答案 1 :(得分：0)
好首先要感谢你们所有人的支持。我终于得到了解决我的问题的祝福和一些我自己的RND .. http://wptrafficanalyzer.in/blog/route-between-two-locations-with-waypoints-in-google-map-android-api-v2/
这大大解决了Direction Parsing问题。 我模拟了我的代码并添加了Maps活动和JSON类中的方法。 这解决了这个问题。 快乐:) 感谢您抽出宝贵的时间.. +任何一个有相同问题的人可以在评论中发布问题我会尝试回答它。通过解决这个问题我学到了很多东西。
答案 2 :(得分：-1)
您可以使用代码here。在此代码中，class Foo {
private String name;
private String id;
@Override
public int hashCode() {
return Objects.hash(name,id);
}
@Override
public boolean equals(Object obj) {
if (obj instanceof Foo) {
Foo right = (Foo) obj;
return Objects.equals(name,right.name) && Objects.equals(id,right.id);
}
return false;
}
}
给出了两点之间的距离，distanceText给出了旅行时间。