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我在嘗試驗證使用Google地圖API的可點擊路線功能。手柄點擊路線
我使用地圖API在兩個座標之間建立了路線顯示。
爲了實現這一點，我使用了基本解析KML文件（谷歌地圖方向請求的響應）的以下教程http://csie-tw.blogspot.com/2009/06/android-driving-direction-route-path.html, ，並使用自定義地圖疊加繪製路線。
自定義背景畫面：
package com.test.route;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.RectF;
import android.util.Log;
import android.view.MotionEvent;
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 MyOverLay extends Overlay
{
private GeoPoint gp1;
private GeoPoint gp2;
private int mRadius=6;
private int mode=0;
private int defaultColor;
private String text="";
private Bitmap img = null;
public MyOverLay(GeoPoint gp1,GeoPoint gp2,int mode) // GeoPoint is a int. (6E)
{
this.gp1 = gp1;
this.gp2 = gp2;
this.mode = mode;
defaultColor = 999; // no defaultColor
}
public MyOverLay(GeoPoint gp1,GeoPoint gp2,int mode, int defaultColor)
{
this.gp1 = gp1;
this.gp2 = gp2;
this.mode = mode;
this.defaultColor = defaultColor;
}
public void setText(String t)
{
this.text = t;
}
public void setBitmap(Bitmap bitmap)
{
this.img = bitmap;
}
public int getMode()
{
return mode;
}
@Override
public boolean draw
(Canvas canvas, MapView mapView, boolean shadow, long when)
{
Projection projection = mapView.getProjection();
if (shadow == false)
{
Paint paint = new Paint();
paint.setAntiAlias(true);
Point point = new Point();
projection.toPixels(gp1, point);
// mode=1¡Gstart
if(mode==1)
{
if(defaultColor==999)
paint.setColor(Color.BLUE);
else
paint.setColor(defaultColor);
RectF oval=new RectF(point.x - mRadius, point.y - mRadius,
point.x + mRadius, point.y + mRadius);
// start point
canvas.drawOval(oval, paint);
}
// mode=2¡Gpath
else if(mode==2)
{
if(defaultColor==999)
paint.setColor(Color.RED);
else
paint.setColor(defaultColor);
Point point2 = new Point();
projection.toPixels(gp2, point2);
paint.setStrokeWidth(5);
paint.setAlpha(120);
canvas.drawLine(point.x, point.y, point2.x,point2.y, paint);
}
/* mode=3¡Gend */
else if(mode==3)
{
/* the last path */
if(defaultColor==999)
paint.setColor(Color.GREEN);
else
paint.setColor(defaultColor);
Point point2 = new Point();
projection.toPixels(gp2, point2);
paint.setStrokeWidth(5);
paint.setAlpha(120);
canvas.drawLine(point.x, point.y, point2.x,point2.y, paint);
RectF oval=new RectF(point2.x - mRadius,point2.y - mRadius,
point2.x + mRadius,point2.y + mRadius);
/* end point */
paint.setAlpha(255);
canvas.drawOval(oval, paint);
}
/* mode=4¡Gcar */
else if(mode==4)
{
if(defaultColor==999)
paint.setColor(Color.GREEN);
else
paint.setColor(defaultColor);
Point point2 = new Point();
projection.toPixels(gp2, point2);
paint.setTextSize(20);
paint.setAntiAlias(true);
canvas.drawBitmap(img, point2.x, point2.y,paint);
canvas.drawText(this.text, point2.x, point2.y, paint);
}
else if(mode==5)
{
if(defaultColor==999)
paint.setColor(Color.GREEN);
else
paint.setColor(defaultColor);
Point point2 = new Point();
projection.toPixels(gp2, point2);
paint.setTextSize(20);
paint.setAntiAlias(true);
canvas.drawBitmap(img, point2.x, point2.y,paint);
}
}
return super.draw(canvas, mapView, shadow, when);
}
@Override
public boolean onTouchEvent(MotionEvent event, MapView mapView)
{
Log.i("Map", "Clicked");
return false;
}
}
測試地圖的活動：
package com.test.route;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.xml.sax.SAXException;
import android.content.Intent;
import android.graphics.Color;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import com.dailymates.carmate.utils.MyOverLay;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapView;
public class TestMap extends MapActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.map);
MapView mapView = (MapView) findViewById(R.id.mapview);
/*
* Defining the starting and end point of the route (latitude/longitude)
* Oh Paris
*
*/
final double src_lat = 48.847378;
final double src_long = 2.340417;
final double dest_lat = 48.931466;
final double dest_long = 2.504525;
GeoPoint srcGeoPoint = new GeoPoint((int) (src_lat * 1E6),
(int) (src_long * 1E6));
GeoPoint destGeoPoint = new GeoPoint((int) (dest_lat * 1E6),
(int) (dest_long * 1E6));
DrawPath(srcGeoPoint, destGeoPoint, Color.GREEN, mapView);
mapView.getController().animateTo(srcGeoPoint);
mapView.getController().setZoom(12);
}
protected boolean isRouteDisplayed() {
return false;
}
private void DrawPath(GeoPoint src, GeoPoint dest, int color, MapView mMapView01) {
StringBuilder urlString = new StringBuilder();
urlString.append("http://maps.google.com/maps?f=d&hl=en");
urlString.append("&saddr=");
urlString.append(Double.toString((double) src.getLatitudeE6()/1.0E6));
urlString.append(",");
urlString.append(Double.toString((double) src.getLongitudeE6()/1.0E6));
urlString.append("&daddr=");// to
urlString.append(Double.toString((double) dest.getLatitudeE6()/1.0E6));
urlString.append(",");
urlString.append(Double.toString((double) dest.getLongitudeE6()/1.0E6));
urlString.append("&ie=UTF8&0&om=0&output=kml");
Log.d("xxx", "URL=" + urlString.toString());
Document doc = null;
HttpURLConnection urlConnection = null;
URL url = null;
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());
if (doc.getElementsByTagName("GeometryCollection").getLength() > 0) {
String path = doc.getElementsByTagName("GeometryCollection")
.item(0).getFirstChild().getFirstChild()
.getFirstChild().getNodeValue();
Log.d("xxx", "path=" + path);
String[] pairs = path.split(" ");
String[] lngLat = pairs[0].split(",");
// lngLat[0]=longitude
// lngLat[1]=latitude
// lngLat[2]=height
GeoPoint startGP = new GeoPoint((int) (Double.parseDouble(lngLat[1]) * 1E6),
(int) (Double.parseDouble(lngLat[0]) * 1E6));
mMapView01.getOverlays().add(new MyOverLay(startGP, startGP, 1));
GeoPoint gp1;
GeoPoint gp2 = startGP;
for (int i = 1; i < pairs.length; i++)
{
lngLat = pairs[i].split(",");
gp1 = gp2;
gp2 = new GeoPoint(
(int) (Double.parseDouble(lngLat[1]) * 1E6),
(int) (Double.parseDouble(lngLat[0]) * 1E6));
mMapView01.getOverlays().add(
new MyOverLay(gp1, gp2, 2, color));
Log.d("xxx", "pair:" + pairs[i]);
}
mMapView01.getOverlays().add(new MyOverLay(dest, dest, 3));
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
}
}
}
所以，正如我所說，我得到正確的路線圖。 但是，我怎麼能處理這些繪製的路線上的點擊事件？
的信息，我在想一些東西，很可能是低效的，但我會告訴你，我們永遠不知道:)
由於路線丁祖泉是basicaly一個beetween 2個geopoints（段）圖紙繼承，我們可以預先處理這種點擊路線：
- 使用地圖疊加的
onTouchEvent方法，我們可以獲取與點擊關聯的地址點。 - 然後我們嘗試確定點擊的地理點是否是路段的一部分。
最後一條信息：在同一時刻將在地圖上繪製多條路線，因此點擊必須關聯到唯一路線，而不是全部。
謝謝。