从我的位置绘制路线到目的地和Lat Lng目的地这是来自SQLite的坐标 这段代码Map.java
public class Map extends FragmentActivity implements LocationListener {
SQLiteDatabase SQL;
GoogleMap map;
myDBClass DB;
Cursor cursor;
ArrayList<LatLng> MarkerPoint;
double latitude = 0;
double longtitude = 0;
GMapV2Direction md;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.show_map);
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
.permitAll().build();
StrictMode.setThreadPolicy(policy);
}
map = ((SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map)).getMap();
map.setMapType(GoogleMap.MAP_TYPE_NORMAL);
map.setMyLocationEnabled(true);
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
Criteria criteria = new Criteria();
String provider = locationManager.getBestProvider(criteria, true);
Location location = locationManager.getLastKnownLocation(provider);
if (location != null) {
onLocationChanged(location);
}
locationManager.requestLocationUpdates(provider, 5000, 0, this);
// Destination Marker from Database SQLite
if (MarkerPoint.size() > 1) {
String Name = getIntent().getStringExtra("Name");
DB = new myDBClass(this);
SQL = DB.getWritableDatabase();
cursor = SQL.rawQuery("SELECT *" + " FROM " + myDBClass.TABLE_NAME
+ " WHERE " + myDBClass.NAME + " ='" + Name + "'", null);
cursor.moveToFirst();
/**String name = cursor.getString(cursor.getColumnIndex(myDBClass.NAME));
double lat_db = cursor.getDouble(cursor.getColumnIndex(myDBClass.LAT));
double lng_db = cursor.getDouble(cursor.getColumnIndex(myDBClass.LNG));
map.addMarker(new MarkerOptions()
.position(new LatLng(lat_db, lng_db))
.title(name)
.icon(BitmapDescriptorFactory
.fromResource(R.drawable.ic_launcher)));**/
latitude = cursor.getDouble(cursor.getColumnIndex(myDBClass.LAT));
longtitude = cursor.getDouble(cursor.getColumnIndex(myDBClass.LNG));
cursor.moveToNext();
LatLng point = new LatLng(latitude, longtitude);
drawMarker(point);
}
if (MarkerPoint.size() >= 2) {
LatLng Start = MarkerPoint.get(0);
LatLng End = MarkerPoint.get(1);
map.addMarker(new MarkerOptions().position(Start).title("Start"));
map.addMarker(new MarkerOptions().position(End).title("End"));
Document doc = md.getDocument(Start, End,GMapV2Direction.MODE_DRIVING);
int duration = md.getDurationValue(doc);
String distance = md.getDistanceText(doc);
String start_address = md.getStartAddress(doc);
String copy_right = md.getCopyRights(doc);
ArrayList<LatLng> directionPoint = md.getDirection(doc);
PolylineOptions rectLine = new PolylineOptions().width(3).color(Color.RED);
for (int i = 0; i < directionPoint.size(); i++) {
rectLine.add(directionPoint.get(i));
}
map.addPolyline(rectLine);
}
}
private void drawMarker(LatLng point) {
MarkerPoint.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 (MarkerPoint.size() == 1) {
options.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_GREEN));
} else if (MarkerPoint.size() == 2) {
options.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_RED));
}
// Add new marker to the Google Map Android API V2
map.addMarker(options);
}
@Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
if (MarkerPoint.size() < 2) {
latitude = location.getLatitude();
longtitude = location.getLongitude();
LatLng point = new LatLng(latitude, longtitude);
// map.moveCamera(CameraUpdateFactory.newLatLng(point));
// map.animateCamera(CameraUpdateFactory.zoomTo(12));
drawMarker(point);
}
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
此代码Manifest.xml 我这个代码没问题因为是代码bacis。
<uses-sdk
android:minSdkVersion="9"
android:targetSdkVersion="16" />
<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.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="com.example.test.permission.MAPS_RECEIVE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<permission
android:name="com.example.test.MAPS_RECEIVE"
android:protectionLevel="signature"/>
<uses-feature android:glEsVersion="0x00020000" android:required="true"/>
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="API_Key"/>
<uses-library android:name="com.google.android.maps"/>
我已经好几天就编辑了这段代码。帮帮我。
答案 0 :(得分：0)
您应该更多地编写代码，将主要功能分开。没有活动类中的所有内容。这段代码并不完美，但也许可以帮助你重新考虑你的代码，做笔记。
助手类示例：
public class DrawRouteHelper {
/**
* PRIVATE ATTRIBUTEQ
*/
public final static String MODE_DRIVING = "driving"; // TODO: google map Driving or Walking choice
public final static String MODE_WALKING = "walking";
public Document getDocument(LatLng start, LatLng end, String mode) {
String url = "http://maps.googleapis.com/maps/api/directions/xml?" + "origin=" + start.latitude + "," + start.longitude + "&destination=" + end.latitude + "," + end.longitude
+ "&sensor=false&units=metric&mode=driving";
try {
HttpClient httpClient = new DefaultHttpClient();
HttpContext localContext = new BasicHttpContext();
HttpPost httpPost = new HttpPost(url);
HttpResponse response = httpClient.execute(httpPost, localContext);
InputStream in = response.getEntity().getContent();
DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
Document doc = builder.parse(in);
return doc;
}
catch (Exception e) {
e.printStackTrace();
}
return null;
}
public String getDurationText(Document doc) {
NodeList nl1 = doc.getElementsByTagName("duration");
Node node1 = nl1.item(0);
NodeList nl2 = node1.getChildNodes();
Node node2 = nl2.item(getNodeIndex(nl2, "text"));
Log.i("DurationText", node2.getTextContent());
return node2.getTextContent();
}
public int getDurationValue(Document doc) {
NodeList nl1 = doc.getElementsByTagName("duration");
Node node1 = nl1.item(0);
NodeList nl2 = node1.getChildNodes();
Node node2 = nl2.item(getNodeIndex(nl2, "value"));
Log.i("DurationValue", node2.getTextContent());
return Integer.parseInt(node2.getTextContent());
}
public String getDistanceText(Document doc) {
NodeList nl1 = doc.getElementsByTagName("distance");
Node node1 = nl1.item(0);
NodeList nl2 = node1.getChildNodes();
Node node2 = nl2.item(getNodeIndex(nl2, "text"));
Log.i("DistanceText", node2.getTextContent());
return node2.getTextContent();
}
public int getDistanceValue(Document doc) {
NodeList nl1 = doc.getElementsByTagName("distance");
Node node1 = nl1.item(0);
NodeList nl2 = node1.getChildNodes();
Node node2 = nl2.item(getNodeIndex(nl2, "value"));
Log.i("DistanceValue", node2.getTextContent());
return Integer.parseInt(node2.getTextContent());
}
public String getStartAddress(Document doc) {
NodeList nl1 = doc.getElementsByTagName("start_address");
Node node1 = nl1.item(0);
Log.i("StartAddress", node1.getTextContent());
return node1.getTextContent();
}
public String getEndAddress(Document doc) {
NodeList nl1 = doc.getElementsByTagName("end_address");
Node node1 = nl1.item(0);
Log.i("StartAddress", node1.getTextContent());
return node1.getTextContent();
}
public String getCopyRights(Document doc) {
NodeList nl1 = doc.getElementsByTagName("copyrights");
Node node1 = nl1.item(0);
Log.i("CopyRights", node1.getTextContent());
return node1.getTextContent();
}
public ArrayList<LatLng> getDirection(Document doc) {
NodeList nl1, nl2, nl3;
ArrayList<LatLng> listGeopoints = new ArrayList<LatLng>();
nl1 = doc.getElementsByTagName("step");
if (nl1.getLength() > 0) {
for (int i = 0; i < nl1.getLength(); i++) {
Node node1 = nl1.item(i);
nl2 = node1.getChildNodes();
Node locationNode = nl2.item(getNodeIndex(nl2, "start_location"));
nl3 = locationNode.getChildNodes();
Node latNode = nl3.item(getNodeIndex(nl3, "lat"));
double lat = Double.parseDouble(latNode.getTextContent());
Node lngNode = nl3.item(getNodeIndex(nl3, "lng"));
double lng = Double.parseDouble(lngNode.getTextContent());
listGeopoints.add(new LatLng(lat, lng));
locationNode = nl2.item(getNodeIndex(nl2, "polyline"));
nl3 = locationNode.getChildNodes();
latNode = nl3.item(getNodeIndex(nl3, "points"));
ArrayList<LatLng> arr = decodePoly(latNode.getTextContent());
for (int j = 0; j < arr.size(); j++) {
listGeopoints.add(new LatLng(arr.get(j).latitude, arr.get(j).longitude));
}
locationNode = nl2.item(getNodeIndex(nl2, "end_location"));
nl3 = locationNode.getChildNodes();
latNode = nl3.item(getNodeIndex(nl3, "lat"));
lat = Double.parseDouble(latNode.getTextContent());
lngNode = nl3.item(getNodeIndex(nl3, "lng"));
lng = Double.parseDouble(lngNode.getTextContent());
listGeopoints.add(new LatLng(lat, lng));
}
}
return listGeopoints;
}
private int getNodeIndex(NodeList nl, String nodename) {
for (int i = 0; i < nl.getLength(); i++) {
if (nl.item(i).getNodeName().equals(nodename))
return i;
}
return -1;
}
private ArrayList<LatLng> decodePoly(String encoded) {
ArrayList<LatLng> poly = new ArrayList<LatLng>();
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;
LatLng position = new LatLng((double) lat / 1E5, (double) lng / 1E5);
poly.add(position);
}
return poly;
}
}
如何使用内部类别示例：
DrawRouteHelper _drawRouteHelper = new DrawRouteHelper();
Document _document;
GoogleMap _googleMap;
private class DrawRouteTask extends AsyncTask<String, Void, String> {
private ProgressDialog Dialog;
String response = "";
@Override
protected void onPreExecute() {
Dialog = new ProgressDialog(ActivityGoogleMap.this);
Dialog.setMessage(getString(R.string.msg_loading));
Dialog.show();
}
@Override
protected String doInBackground(String... urls) {
// Get All Route values
_document = _drawRouteHelper.getDocument(_locationFrom, _locationTo, DrawRouteHelper.MODE_DRIVING);
response = "Success";
return response;
}
@Override
protected void onPostExecute(String result) {
try {
if (response.equalsIgnoreCase("Success")) {
ArrayList<LatLng> directionPoint = _drawRouteHelper.getDirection(_document);
PolylineOptions rectLine = new PolylineOptions().width(10).color(Color.RED);
for (int i = 0; i < directionPoint.size(); i++) {
rectLine.add(directionPoint.get(i));
}
// Adding route on the map
_googleMap.addPolyline(rectLine);
}
}
catch (Exception e) {
// TODO:ERROR TRACE ROUTE
}
Dialog.dismiss();
}
}