用于显示行车路线的 Android 项目不起作用
Posted
技术标签:
【中文标题】用于显示行车路线的 Android 项目不起作用【英文标题】：Android project for displaing driving routes not working 【发布时间】：2012-11-29 18:30:12 【问题描述】：我正在按照本教程开发一个用于显示 2 点之间的行驶路线的 android 应用程序- http://asmncl.blogspot.co.uk/2012/04/android-draw-route-map-between-two.html ，但我的应用程序在运行后停止。 我没有使用 kml，因为我知道 Google 不再支持 kml。 但是，当我运行这段代码时，它会停止。 谁能告诉我，可能是什么原因？
编辑 原来我没有在我的androidmanfest.xml 中包含谷歌地图库。 现在，它没有显示任何错误，但在手机上安装后它崩溃了。 谁能告诉我，为什么？
谢谢
RoutePath-Main Activity
public class RoutePath extends MapActivity
MapView mapView;
private RoutePath _activity;
GeoPoint srcGeoPoint,destGeoPoint;
private static List<Overlay> mOverlays;
@Override
public void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
SharedData data = SharedData.getInstance();
mapView = new MapView(this,data.getAPIKEY());
mapView.setClickable(true);
setContentView(mapView);
_activity = this;
double src_lat = data.getSrc_lat();
double src_long = data.getSrc_lng();
double dest_lat = data.getDest_lat();
double dest_long = data.getDest_lng();
if(src_lat == -1 || src_long == -1 || dest_lat == -1 || dest_long == -1)
showAlert("Please enter source and destination points");
else
srcGeoPoint = new GeoPoint((int) (src_lat * 1E6),(int) (src_long * 1E6));
destGeoPoint = new GeoPoint((int) (dest_lat * 1E6),(int) (dest_long * 1E6));
List<Overlay> mapOverlays = mapView.getOverlays();
Drawable srcdrawable = this.getResources().getDrawable(R.drawable.pin_green);
CustomItemizedOverlay srcitemizedOverlay = new CustomItemizedOverlay(srcdrawable);
//CustomItemizedOverlay srcitemizedOverlay = new CustomItemizedOverlay(getDrawable("com/agarwal/route/pin_green.png"));
OverlayItem srcoverlayitem = new OverlayItem(srcGeoPoint, "Hello!", "This is your Location.");
Drawable destdrawable = this.getResources().getDrawable(R.drawable.pin_red);
CustomItemizedOverlay destitemizedOverlay = new CustomItemizedOverlay( destdrawable );
// CustomItemizedOverlay destitemizedOverlay = new CustomItemizedOverlay(getDrawable("com/agarwal/route/pin_red.png"));
OverlayItem destoverlayitem = new OverlayItem(destGeoPoint, "Hello!", "This is dest Location.");
srcitemizedOverlay.addOverlay(srcoverlayitem);
destitemizedOverlay.addOverlay(destoverlayitem);
mapOverlays.add(srcitemizedOverlay);
mapOverlays.add(destitemizedOverlay);
connectAsyncTask _connectAsyncTask = new connectAsyncTask();
_connectAsyncTask.execute();
mapView.setBuiltInZoomControls(true);
mapView.displayZoomControls(true);
mOverlays = mapView.getOverlays();
mapView.getController().animateTo(srcGeoPoint);
mapView.getController().setZoom(12);
//SharedData data = SharedData.getInstance();
data.setAPIKEY("APIKEY");
data.setSrc_lat(17);
data.setSrc_lng(78);
data.setDest_lat(18);
data.setDest_lng(77);
startActivity(new Intent(RoutePath.this,RoutePath.class));
@Override
protected boolean isRouteDisplayed()
// TODO Auto-generated method stub
return false;
private class connectAsyncTask extends AsyncTask<Void, Void, Void>
private ProgressDialog progressDialog;
@Override
protected void onPreExecute()
// TODO Auto-generated method stub
super.onPreExecute();
progressDialog = new ProgressDialog(_activity);
progressDialog.setMessage("Fetching route, Please wait...");
progressDialog.setIndeterminate(true);
progressDialog.show();
@Override
protected Void doInBackground(Void... params)
// TODO Auto-generated method stub
fetchData();
return null;
@Override
protected void onPostExecute(Void result)
// TODO Auto-generated method stub
super.onPostExecute(result);
if(doc!=null)
Overlay ol = new MyOverlay(_activity,srcGeoPoint,srcGeoPoint,1);
mOverlays.add(ol);
NodeList _nodelist = doc.getElementsByTagName("status");
Node node1 = _nodelist.item(0);
String _status1 = node1.getChildNodes().item(0).getNodeValue();
if(_status1.equalsIgnoreCase("OK"))
NodeList _nodelist_path = doc.getElementsByTagName("overview_polyline");
Node node_path = _nodelist_path.item(0);
Element _status_path = (Element)node_path;
NodeList _nodelist_destination_path = _status_path.getElementsByTagName("points");
Node _nodelist_dest = _nodelist_destination_path.item(0);
String _path = _nodelist_dest.getChildNodes().item(0).getNodeValue();
List<GeoPoint> _geopoints = decodePoly(_path);
GeoPoint gp1;
GeoPoint gp2;
gp2 = _geopoints.get(0);
Log.d("_geopoints","::"+_geopoints.size());
for(int i=1;i<_geopoints.size();i++) // the last one would be crash
gp1 = gp2;
gp2 = _geopoints.get(i);
Overlay ol1 = new MyOverlay(gp1,gp2,2,Color.BLUE);
mOverlays.add(ol1);
Overlay ol2 = new MyOverlay(_activity,destGeoPoint,destGeoPoint,3);
mOverlays.add(ol2);
progressDialog.dismiss();
else
showAlert("Unable to find the route");
Overlay ol2 = new MyOverlay(_activity,destGeoPoint,destGeoPoint,3);
mOverlays.add(ol2);
progressDialog.dismiss();
mapView.scrollBy(-1,-1);
mapView.scrollBy(1,1);
else
showAlert("Unable to find the route");
Document doc = null;
private void fetchData()
StringBuilder urlString = new StringBuilder();
urlString.append("http://maps.google.com/maps/api/directions/xml?origin=");
urlString.append( Double.toString((double)srcGeoPoint.getLatitudeE6()/1.0E6 ));
urlString.append(",");
urlString.append( Double.toString((double)srcGeoPoint.getLongitudeE6()/1.0E6 ));
urlString.append("&destination=");//to
urlString.append( Double.toString((double)destGeoPoint.getLatitudeE6()/1.0E6 ));
urlString.append(",");
urlString.append( Double.toString((double)destGeoPoint.getLongitudeE6()/1.0E6 ));
urlString.append("&sensor=true&mode=driving");
Log.d("url","::"+urlString.toString());
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 = (Document) db.parse(urlConnection.getInputStream());//Util.XMLfromString(response);
catch (MalformedURLException e)
e.printStackTrace();
catch (IOException e)
e.printStackTrace();
catch (ParserConfigurationException e)
e.printStackTrace();
catch (SAXException e)
// TODO Auto-generated catch block
e.printStackTrace();
private List<GeoPoint> decodePoly(String encoded)
List<GeoPoint> poly = new ArrayList<GeoPoint>();
int index = 0, len = encoded.length();
int lat = 0, lng = 0;
while (index < len)
int b, shift = 0, result = 0;
do
b = encoded.charAt(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
while (b >= 0x20);
int dlat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
lat += dlat;
shift = 0;
result = 0;
do
b = encoded.charAt(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
while (b >= 0x20);
int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
lng += dlng;
GeoPoint p = new GeoPoint((int) (((double) lat / 1E5) * 1E6),
(int) (((double) lng / 1E5) * 1E6));
poly.add(p);
return poly;
private void showAlert(String message)
AlertDialog.Builder alert = new AlertDialog.Builder(_activity);
alert.setTitle("Error");
alert.setCancelable(false);
alert.setMessage(message);
alert.setPositiveButton("Ok",new DialogInterface.OnClickListener()
public void onClick(DialogInterface dialog, int which)
// TODO Auto-generated method stub
);
alert.show();
private Drawable getDrawable(String fileName)
return Drawable.createFromStream(_activity.getClass().getClassLoader().getResourceAsStream(fileName), "pin");
我创建了另外 3 个类 -SharedData.java、CustomItemizedOverlay.java 和 MyOverrlay.java。 我通过 SharedData.java 传递我的 API_KEY。
Main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_
android:layout_ >
<com.google.android.maps.MapView
android:id="@+id/mapid"
android:layout_
android:layout_
android:enabled="true"
android:clickable="true"
android:apiKey="APIKEY"
/>
<TextView
android:layout_
android:layout_
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="@string/hello_world"
tools:context=".RoutePath" />
</RelativeLayout>
AndroidManifest.xml
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.path"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />
<application
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=".RoutePath"
android:label="@string/title_activity_path" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
</manifest>
【问题讨论】：
你没有在application标签中添加<uses-library android:name="com.google.android.maps"/>。
【参考方案1】：
您应该在布局中的 MapView 中添加您的 Google Map Api Key Debug One ...
【讨论】：
我已经在我的项目中添加了我的 APIKEY，但是应用程序在启动后关闭。它没有显示任何内容。 伙计，你错了，我认为 setContentView(mapView); , MapView 是 Layout 中的 View , 像 Button 或 ImageView , 所以 setContentView(R.layout.main);对吗？以上是关于用于显示行车路线的 Android 项目不起作用的主要内容，如果未能解决你的问题，请参考以下文章
用于选择每页显示的项目的 DataTables 菜单不起作用