想画任意两个位置之间的直线的Android

问题描述：

这是我main活动想画任意两个位置之间的直线的Android

import java.net.HttpURLConnection; 
import java.net.URL; 
import javax.xml.parsers.DocumentBuilder; 
import javax.xml.parsers.DocumentBuilderFactory; 
import org.w3c.dom.Document; 
import org.w3c.dom.Node; 
import org.w3c.dom.NodeList; 
import android.os.Bundle; 
import android.util.Log; 
import com.google.android.maps.GeoPoint; 
import com.google.android.maps.MapActivity; 
import com.google.android.maps.MapController; 
import com.google.android.maps.MapView; 

public class DrawActivity extends MapActivity { 
MapView myMapView = null; 
MapController myMC = null; 
GeoPoint geoPoint = null; 
    String pairs[]=null; 
/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 


    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    myMapView = (MapView) findViewById(R.id.mapview); 
    geoPoint = null; 
    myMapView.setSatellite(false); 
    System.out.println("before pairs"); 
    String pairs[] = getDirectionData("Hyderabad","hyderguda"); 

    System.out.println("pairs:"+pairs[1]); 
    String[] lngLat = pairs[0].split(","); 

    // STARTING POINT 
    GeoPoint startGP = new GeoPoint(
    (int) (Double.parseDouble(lngLat[1]) * 1E6), (int) (Double 
     .parseDouble(lngLat[0]) * 1E6)); 

    myMC = myMapView.getController(); 
    geoPoint = startGP; 
    myMC.setCenter(geoPoint); 
    myMC.setZoom(15); 
    myMapView.getOverlays().add(new DirectionPathOverlay(startGP, startGP)); 

    // NAVIGATE THE PATH 

    GeoPoint gp1; 
    GeoPoint gp2 = startGP; 

    for (int i = 1; i < pairs.length; i++) { 
    lngLat = pairs[i].split(","); 
    gp1 = gp2; 
    // watch out! For GeoPoint, first:latitude, second:longitude 

    gp2 = new GeoPoint((int) (Double.parseDouble(lngLat[1]) * 1E6), 
    (int) (Double.parseDouble(lngLat[0]) * 1E6)); 
    myMapView.getOverlays().add(new DirectionPathOverlay(gp1, gp2)); 
    Log.d("xxx", "pair:" + pairs[i]); 
    } 

    // END POINT 
    myMapView.getOverlays().add(new DirectionPathOverlay(gp2, gp2)); 

    myMapView.getController().animateTo(startGP); 
    myMapView.setBuiltInZoomControls(true); 
    myMapView.displayZoomControls(true); 

} 

@Override 
protected boolean isRouteDisplayed() { 
    // TODO Auto-generated method stub 
    return false; 
} 

private String[] getDirectionData(String srcPlace, String destPlace) { 




    String urlString = "http://maps.google.com/maps?f=d&hl=en&saddr=" 
    + srcPlace + "&daddr=" + destPlace 
    + "&ie=UTF8&0&om=0&output=kml"; 

    Log.d("URL", urlString); 
    Document doc = null; 
    HttpURLConnection urlConnection = null; 
    URL url = null; 
    String pathConent = ""; 

    try { 

    url = new URL(urlString.toString()); 
    urlConnection = (HttpURLConnection) url.openConnection(); 
    urlConnection.setRequestMethod("GET"); 
    urlConnection.setDoOutput(true); 
    urlConnection.setDoInput(true); 
    urlConnection.connect(); 
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); 
    DocumentBuilder db = dbf.newDocumentBuilder(); 
    doc = db.parse(urlConnection.getInputStream()); 

//The above code "doc" is getting null value so thats why its getting crashed here itself not going further execution and returning as `nullpointerexception` 
    } catch (Exception e) { 
    } 

    NodeList nl = doc.getElementsByTagName("LineString"); 
    for (int s = 0; s < nl.getLength(); s++) { 
    Node rootNode = nl.item(s); 
    NodeList configItems = rootNode.getChildNodes(); 
    for (int x = 0; x < configItems.getLength(); x++) { 
    Node lineStringNode = configItems.item(x); 
    NodeList path = lineStringNode.getChildNodes(); 
    pathConent = path.item(0).getNodeValue(); 
    } 
    } 
    String[] tempContent = pathConent.split(" "); 
    return tempContent; 
} 

}

和我的代码包com.hands另一部分;上述

import android.graphics.Canvas; 
import android.graphics.Color; 
import android.graphics.Paint; 
import android.graphics.Point; 

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

public class DirectionPathOverlay extends Overlay { 

private GeoPoint gp1; 
private GeoPoint gp2; 

public DirectionPathOverlay(GeoPoint gp1, GeoPoint gp2) { 
    this.gp1 = gp1; 
    this.gp2 = gp2; 
} 

@Override 
public boolean draw(Canvas canvas, MapView mapView, boolean shadow, 
     long when) { 
    // TODO Auto-generated method stub 
    Projection projection = mapView.getProjection(); 
    if (shadow == false) { 

     Paint paint = new Paint(); 
     paint.setAntiAlias(true); 
     Point point = new Point(); 
     projection.toPixels(gp1, point); 
     paint.setColor(Color.BLUE); 
     Point point2 = new Point(); 
     projection.toPixels(gp2, point2); 
     paint.setStrokeWidth(2); 
     canvas.drawLine((float) point.x, (float) point.y, (float) point2.x, 
       (float) point2.y, paint); 
    } 
    return super.draw(canvas, mapView, shadow, when); 
} 

@Override 
public void draw(Canvas canvas, MapView mapView, boolean shadow) { 
    // TODO Auto-generated method stub 

    super.draw(canvas, mapView, shadow); 
} 

}

是我的完整源代码plz帮助我从这个问题

答

您正在使用output=kml，这个参数不再适用。您会收到错误消息，因为此网址现在会检索不是KML文件的网页。

这种从Google分析KML文件中提取Google路线的方式自2012年7月27日起不再可用（因为Google已更改检索Google路线的结构，现在只能通过JSON或XML获取）现在是时候将您的代码迁移到JSON而不是KML。

请参阅我自己的问题here的答案。

想画任意两个位置之间的直线的Android

相关推荐