获取从当前位置到用户输入位置的路径和距离

Question

我想要的是用户从EditText提供位置名称。 然后用户单击搜索位置按钮。 然后确定用户输入和用户当前位置，并计算从当前位置到用户搜索位置和绘制线的距离。 我做了以下代码，只显示谷歌地图。但不包括EditText。 我必须包括EditText和Button？

的AndroidManifest.xml

    <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.joshclemm.android.tutorial"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".MyMapLocationActivity"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    <!-- Make sure the uses-library line is inside the application tag -->
    <uses-library android:name="com.google.android.maps" />
    </application>
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
</manifest> 

main.xml中

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

    <com.google.android.maps.MapView
        android:id="@+id/mapview"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:apiKey="My Api key"
        android:clickable="true" />

</LinearLayout>

FixedMyLocationoverlay.java

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.Paint.Style;
import android.graphics.drawable.Drawable;
import android.location.Location;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapView;
import com.google.android.maps.MyLocationOverlay;
import com.google.android.maps.Projection;


public class FixedMyLocationOverlay extends MyLocationOverlay {

    private boolean bugged = false;

    private Drawable drawable;
    private Paint accuracyPaint;
    private Point center;
    private Point left;
    private int width;
    private int height;

    public FixedMyLocationOverlay(Context context, MapView mapView) {
        super(context, mapView);
    }

    @Override
    protected void drawMyLocation(Canvas canvas, MapView mapView,
            Location lastFix, GeoPoint myLocation, long when) {
        if (!bugged) {
            try {
                super.drawMyLocation(canvas, mapView, lastFix, myLocation, when);
            } catch (Exception e) {
                // we found a buggy phone, draw the location icons ourselves
                bugged = true;
            }
        }

        if (bugged) {
            if (drawable == null) {

                accuracyPaint = new Paint();
                accuracyPaint.setAntiAlias(true);
                accuracyPaint.setStrokeWidth(2.0f);

                drawable = mapView
                        .getContext()
                        .getResources()
                        .getDrawable(
                                R.drawable.ic_maps_indicator_current_position);
                width = drawable.getIntrinsicWidth();
                height = drawable.getIntrinsicHeight();
                center = new Point();
                left = new Point();
            }

            Projection projection = mapView.getProjection();
            double latitude = lastFix.getLatitude();
            double longitude = lastFix.getLongitude();
            float accuracy = lastFix.getAccuracy();

            float[] result = new float[1];

            Location.distanceBetween(latitude, longitude, latitude,
                    longitude + 1, result);
            float longitudeLineDistance = result[0];

            GeoPoint leftGeo = new GeoPoint(
                    (int) (latitude * 1e6),
                    (int) ((longitude - accuracy / longitudeLineDistance) * 1e6));
            projection.toPixels(leftGeo, left);
            projection.toPixels(myLocation, center);
            int radius = center.x - left.x;

            accuracyPaint.setColor(0xff6666ff);
            accuracyPaint.setStyle(Style.STROKE);
            canvas.drawCircle(center.x, center.y, radius, accuracyPaint);

            accuracyPaint.setColor(0x186666ff);
            accuracyPaint.setStyle(Style.FILL);
            canvas.drawCircle(center.x, center.y, radius, accuracyPaint);

            drawable.setBounds(center.x - width / 2, center.y - height / 2,
                    center.x + width / 2, center.y + height / 2);
            drawable.draw(canvas);
        }
    }
}

MyLocationMapActivity.java

import android.os.Bundle;
import android.widget.Toast;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapView;
import com.google.android.maps.MyLocationOverlay;

public class MyMapLocationActivity extends MapActivity {

    private MapView mapView;
    private MyLocationOverlay myLocationOverlay;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.main); 

        mapView = (MapView) findViewById(R.id.mapview);
        mapView.setBuiltInZoomControls(true);
        myLocationOverlay = new FixedMyLocationOverlay(this, mapView);
        mapView.getOverlays().add(myLocationOverlay);
        mapView.postInvalidate();
        zoomToMyLocation();
    }

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

    @Override
    protected void onPause() {
        super.onPause();
        myLocationOverlay.disableMyLocation();
    }


    private void zoomToMyLocation() {
        GeoPoint myLocationGeoPoint = myLocationOverlay.getMyLocation();
        if(myLocationGeoPoint != null) {
            mapView.getController().animateTo(myLocationGeoPoint);
            mapView.getController().setZoom(10);
        }
        else {
            Toast.makeText(this, "Cannot determine location", Toast.LENGTH_SHORT).show();
        }
    }

    @Override
    protected boolean isRouteDisplayed() {
        return false;
    }
}

帮助我。

Answer 1

你可以把EditText＆amp; main.xml里面的按钮也是。您只需要从EditText获取值，以便根据您的要求放置它。对于Direction，我在我的应用程序中使用了以下代码，它运行正常。

下面，

saddr =源地址（lat，lng）

daddr =目的地地址（lat，lng）

请注意，您也可以传递地址字符串而不是lat / lng。

public void showDirections(View view) {
        final Intent intent = new Intent(Intent.ACTION_VIEW,Uri.parse("http://maps.google.com/maps?" + "saddr="+ latitude + "," + longitude + "&daddr=" + latitude + "," + longitude));
        intent.setClassName("com.google.android.apps.maps","com.google.android.maps.MapsActivity");
        startActivity(intent);
    }

请注意，我已使用Google地图的网络服务来显示方向。

要计算距离，您必须使用 distanceTo 方法，该方法会以双倍的方式返回距离。

double distance = sourceLocation.distanceTo(destinationLocation);

希望这会对你有所帮助。

Answer 2

您可以使用以下功能获取经度和纬度。

 @Override
 public boolean onTouchEvent(MotionEvent event, MapView mapView) 
 {   
    add="";
    //---when user lifts his finger---
    if (event.getAction() == 1) {                
        GeoPoint p = mapView.getProjection().fromPixels(
            (int) event.getX(),
            (int) event.getY());

        Geocoder geoCoder = new Geocoder(
                getBaseContext(), Locale.getDefault());
        try {
            List<Address> addresses = geoCoder.getFromLocation(
                p.getLatitudeE6()  / 1E6, 
                p.getLongitudeE6() / 1E6, 1);

            lattitude=p.getLatitudeE6()  / 1E6;
            longitude=p.getLongitudeE6() / 1E6;

            if (addresses.size() > 0) 
            {
                for (int i=0; i<addresses.get(0).getMaxAddressLineIndex(); 
                     i++)
                   add += addresses.get(0).getAddressLine(i) + "\n";
            }

            Toast.makeText(getBaseContext(), add, Toast.LENGTH_SHORT).show();
        }
        catch (IOException e) {                
            e.printStackTrace();
        }   
        return true;
    }                
    else {
         return false;
    }
}        
}

使用以下函数计算用户当前lat-long与存储的lat-long之间的差值。

public static double distFrom(double lat1, double lng1, double lat2, double lng2) { 
  double earthRadius = 3958.75; 
  double dLat = Math.toRadians(lat2-lat1); 
  double dLng = Math.toRadians(lng2-lng1); 
  double a = Math.sin(dLat/2) * Math.sin(dLat/2) + 
           Math.cos(Math.toRadians(lat1)) * Math.cos(Math.toRadians(lat2)) * 
           Math.sin(dLng/2) * Math.sin(dLng/2); 
  double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); 
  double dist = earthRadius * c; 

  return dist; 
} 

Answer 3

public class MainActivity extends FragmentActivity {

GoogleMap map;
ArrayList<LatLng> markerPoints;
TextView tvDistanceDuration;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    tvDistanceDuration = (TextView) findViewById(R.id.tv_distance_time);

    // Initializing
    markerPoints = new ArrayList<LatLng>();

    // Getting reference to SupportMapFragment of the activity_main
    SupportMapFragment fm = (SupportMapFragment)getSupportFragmentManager().findFragmentById(R.id.map);

    // Getting Map for the SupportMapFragment
    map = fm.getMap();

    // Enable MyLocation Button in the Map
    map.setMyLocationEnabled(true);

    // Setting onclick event listener for the map
    map.setOnMapClickListener(new OnMapClickListener() {

        @Override
        public void onMapClick(LatLng point) {

            // Already two locations
            if(markerPoints.size()>1){
                markerPoints.clear();
                map.clear();
            }

            // Adding new item to the ArrayList
            markerPoints.add(point);

            // Creating MarkerOptions
            MarkerOptions options = new MarkerOptions();

            // Setting the position of the marker
            options.position(point);

            /**
            * For the start location, the color of marker is GREEN and
            * for the end location, the color of marker is RED.
            */
            if(markerPoints.size()==1){
                options.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN));
            }else if(markerPoints.size()==2){
                options.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
            }

            // Add new marker to the Google Map Android API V2
            map.addMarker(options);

            // Checks, whether start and end locations are captured
            if(markerPoints.size() >= 2){
                LatLng origin = markerPoints.get(0);
                LatLng dest = markerPoints.get(1);

                // Getting URL to the Google Directions API
                String url = getDirectionsUrl(origin, dest);

                DownloadTask downloadTask = new DownloadTask();

                // Start downloading json data from Google Directions API
                downloadTask.execute(url);
            }
        }
    });
}

private String getDirectionsUrl(LatLng origin,LatLng dest){

    // Origin of route
    String str_origin = "origin="+origin.latitude+","+origin.longitude;

    // Destination of route
    String str_dest = "destination="+dest.latitude+","+dest.longitude;

    // Sensor enabled
    String sensor = "sensor=false";

    // Building the parameters to the web service
    String parameters = str_origin+"&"+str_dest+"&"+sensor;

    // Output format
    String output = "json";

    // Building the url to the web service
    String url = "https://maps.googleapis.com/maps/api/directions/"+output+"?"+parameters;

    return url;
}

/** A method to download json data from url */
private String downloadUrl(String strUrl) throws IOException{
    String data = "";
    InputStream iStream = null;
    HttpURLConnection urlConnection = null;
    try{
        URL url = new URL(strUrl);

        // Creating an http connection to communicate with url
        urlConnection = (HttpURLConnection) url.openConnection();

        // Connecting to url
        urlConnection.connect();

        // Reading data from url
        iStream = urlConnection.getInputStream();

        BufferedReader br = new BufferedReader(new InputStreamReader(iStream));

        StringBuffer sb  = new StringBuffer();

        String line = "";
        while( ( line = br.readLine())  != null){
            sb.append(line);
        }

        data = sb.toString();

        br.close();

    }catch(Exception e){
        Log.d("Exception while downloading url", e.toString());
    }finally{
        iStream.close();
        urlConnection.disconnect();
    }
    return data;
}

// Fetches data from url passed
private class DownloadTask extends AsyncTask<String, Void, String>{

    // Downloading data in non-ui thread
    @Override
    protected String doInBackground(String... url) {

        // For storing data from web service
        String data = "";

        try{
            // Fetching the data from web service
            data = downloadUrl(url[0]);
        }catch(Exception e){
            Log.d("Background Task",e.toString());
        }
        return data;
    }

    // Executes in UI thread, after the execution of
    // doInBackground()
    @Override
    protected void onPostExecute(String result) {
        super.onPostExecute(result);

        ParserTask parserTask = new ParserTask();

        // Invokes the thread for parsing the JSON data
        parserTask.execute(result);
    }
}

/** A class to parse the Google Places in JSON format */
private class ParserTask extends AsyncTask<String, Integer, List<List<HashMap<String,String>>> >{

    // Parsing the data in non-ui thread
    @Override
    protected List<List<HashMap<String, String>>> doInBackground(String... jsonData) {

        JSONObject jObject;
        List<List<HashMap<String, String>>> routes = null;

        try{
            jObject = new JSONObject(jsonData[0]);
            DirectionsJSONParser parser = new DirectionsJSONParser();

            // Starts parsing data
            routes = parser.parse(jObject);
        }catch(Exception e){
            e.printStackTrace();
        }
        return routes;
    }

    // Executes in UI thread, after the parsing process
    @Override
    protected void onPostExecute(List<List<HashMap<String, String>>> result) {
        ArrayList<LatLng> points = null;
        PolylineOptions lineOptions = null;
        MarkerOptions markerOptions = new MarkerOptions();
        String distance = "";
        String duration = "";

        if(result.size()<1){
            Toast.makeText(getBaseContext(), "No Points", Toast.LENGTH_SHORT).show();
            return;
        }

        // Traversing through all the routes
        for(int i=0;i<result.size();i++){
            points = new ArrayList<LatLng>();
            lineOptions = new PolylineOptions();

            // Fetching i-th route
            List<HashMap<String, String>> path = result.get(i);

            // Fetching all the points in i-th route
            for(int j=0;j<path.size();j++){
                HashMap<String,String> point = path.get(j);

                if(j==0){    // Get distance from the list
                    distance = (String)point.get("distance");
                    continue;
                }else if(j==1){ // Get duration from the list
                    duration = (String)point.get("duration");
                    continue;
                }

                double lat = Double.parseDouble(point.get("lat"));
                double lng = Double.parseDouble(point.get("lng"));
                LatLng position = new LatLng(lat, lng);

                points.add(position);
            }

            // Adding all the points in the route to LineOptions
            lineOptions.addAll(points);
            lineOptions.width(2);
            lineOptions.color(Color.RED);
        }

        tvDistanceDuration.setText("Distance:"+distance + ", Duration:"+duration);

        // Drawing polyline in the Google Map for the i-th route
        map.addPolyline(lineOptions);
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}
}