如何查找从当前位置到设置标记的距离和旅行路线

Question

我正在做计程车费计算项目，显示了我当前的位置，但我想计算距离并使用纬度显示从当前位置到其他城市的旅行路线.. 请建议n帮助...

Maps.java 包 com.example.mainproject;

  import java.util.List;

import android.content.Context;
      import android.content.Intent;
  import android.graphics.drawable.Drawable;
  import android.location.Location;
 import android.location.LocationListener;
  import android.location.LocationManager;
      import android.os.Bundle;
    import android.support.v4.app.FragmentActivity;
   import android.util.Log;
 import android.widget.Toast;

import com.example.mainproject.R;
 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.CameraPosition;
    import com.google.android.gms.maps.model.LatLng;
  import com.google.android.gms.maps.model.MarkerOptions;


 public class Maps extends FragmentActivity implements LocationListener {
// Google Map
    private GoogleMap googleMap;
    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.maps);

        try {
            // Loading map
            initilizeMap();

            // Changing map type
            googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
            // googleMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
            // googleMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
            // googleMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN);
            // googleMap.setMapType(GoogleMap.MAP_TYPE_NONE);

            // Showing / hiding your current location
            googleMap.setMyLocationEnabled(true);

            // Enable / Disable zooming controls
            googleMap.getUiSettings().setZoomControlsEnabled(false);

            // Enable / Disable my location button
            googleMap.getUiSettings().setMyLocationButtonEnabled(true);

            // Enable / Disable Compass icon
            googleMap.getUiSettings().setCompassEnabled(true);

            // Enable / Disable Rotate gesture
            googleMap.getUiSettings().setRotateGesturesEnabled(true);

            // Enable / Disable zooming functionality
            googleMap.getUiSettings().setZoomGesturesEnabled(true);

        } catch (Exception e) {
            e.printStackTrace();
        }
        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);
        googleMap.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) { }


    @Override
    protected void onResume() {
        super.onResume();
        initilizeMap();
    }

    /**
     * function to load map If map is not created it will create it for you
     * */
    private void initilizeMap() {
        if (googleMap == null) {
            googleMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(
                    R.id.map)).getMap();

            // check if map is created successfully or not
            if (googleMap == null) {
                Toast.makeText(getApplicationContext(),
                        "Sorry! unable to create maps", Toast.LENGTH_SHORT)
                        .show();
            }
        }
    }

    }

map.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >

<fragment
    android:id="@+id/map"
    android:name="com.google.android.gms.maps.SupportMapFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

 </RelativeLayout>

清单

    <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.mainproject"
android:versionCode="1"
android:versionName="1.0" >

<permission
    android:name="com.example.mainproject.permission.MAPS_RECEIVE"
    android:protectionLevel="signature" />

<uses-permission android:name="com.example.mainproject.permission.MAPS_RECEIVE" />

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="18" />

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

<!-- Required to show current location -->
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

<!-- Required OpenGL ES 2.0. for Maps V2 -->
<uses-feature
    android:glEsVersion="0x00020000"
    android:required="true" />

<!-- Requires OpenGL ES version 2 -->
<uses-feature
    android:glEsVersion="0x00020000"
    android:required="true" />    

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >

    <uses-library android:name="com.google.android.maps" />
    <activity
        android:name="com.example.mainproject.MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

        <activity class=".selectcity" android:label="selectcity"

        android:name="com.example.mainproject.selectcity">            
        </activity>

        <activity class=".About" android:label="About" 

         android:name="com.example.mainproject.About">            
        </activity>

        <activity class=".entervalues" android:label="entervalues" 
         android:name="com.example.mainproject.entervalues">         
        </activity>

        <activity class=".exit" android:label="exit" android:name="com.example.mainproject.exit">            
        </activity>

        <activity class=".Maps" android:label="Maps" android:name="com.example.mainproject.Maps">
         </activity>

        <meta-data
              android:name="com.google.android.maps.v2.API_KEY"
              android:value="AIza***************`enter code here`"/>
        <meta-data android:name="com.google.android.gms.version"  
            android:value="@integer/google_play_services_version" />
        </application>

        </manifest>

Answer 1

要从 Google 获取方向和距离，您必须执行以下操作： 将此代码写在方向按钮的单击侦听器上或您要显示方向和距离的任何地方。

String uri = "http://maps.google.com/maps?saddr="
                            + source_latitude + "," + source_longitude + "&daddr="
                            + destination_latitude + ","
                            + destination_longitude;
Intent intent = new Intent(android.content.Intent.ACTION_VIEW,
                    Uri.parse(uri));
            intent.setClassName("com.google.android.apps.maps",
                    "com.google.android.maps.MapsActivity");
            startActivity(intent);