我已将谷歌地图功能添加到我的应用程序中，现在我问你，有什么办法，我怎样才能添加这个mapView路由功能。我将从我的GPS（如开始）和目的地坐标获得坐标。我想绘制路线，我应该采取完成的路线。有可能吗？
由于
答案 0 :(得分：3)
Hmyzak看到Max Gontar给出的最有希望的解决方案......它对我有用。 J2ME/Android/BlackBerry - driving directions, route between two locations
答案 1 :(得分：0)
这就是我要做的 首先在听取位置变化的同时将坐标记录到数据库中
public void startRouteTracking(){
// Acquire a reference to the system Location Manager
locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
// Define a listener that responds to location updates
locationListener = new LocationListener() {
LocationOpenHelper myLocationDb = new LocationOpenHelper(Main.this);
SQLiteDatabase locationDb = myLocationDb.getWritableDatabase();
public void onStatusChanged(String provider, int status, Bundle extras) {}
public void onProviderEnabled(String provider) {}
public void onProviderDisabled(String provider) {}
@Override
public void onLocationChanged(Location location) {
//if last location is known and the current location is newer than last location
//if ((lastLocation != null) && (location.getTime() > lastLocation.getTime())){
if ((lastLocation != null)){
ContentValues values = new ContentValues();
values.put(COLUMN_LATITUDE, location.getLatitude());
values.put(COLUMN_LONGITUDE, location.getLongitude());
values.put(COLUMN_TIME, location.getTime());
values.put(COLUMN_SPEED, location.getSpeed());
values.put(COLUMN_DISTANCE_TO_LAST_LOC, location.distanceTo(lastLocation));
locationDb.insert(LOCATION_TABLE_NAME, null, values);
statusTextView.setText("provider " + location.getProvider() + location.getLatitude() + " " + location.getLongitude() + "speed:" + location.getSpeed() + "distance: " + location.distanceTo(lastLocation));
}
lastLocation = location;
}
};
// Register the listener with the Location Manager to receive location updates
// Update every 5 seconds or 5 meters, whichever comes first
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
}
其次，从数据库中检索坐标并将数据传递到地图片段对话框
public int showMapFragment(int year, int month, int day){
GoogleMap mMap;
SupportMapFragment mMapFragment;
//myMapFragment = SupportMapFragment.newInstance(mapOptions);
ArrayList<LatLng> latLongArray = new ArrayList<LatLng> ();
ArrayList<Long> timeArray = new ArrayList<Long> ();
ArrayList<Integer> distanceToLastArray = new ArrayList<Integer> ();
ArrayList<Integer> speedArray = new ArrayList<Integer> ();
LocationOpenHelper myLocationDb = new LocationOpenHelper(this);
myLocationDb.printsomething();
SQLiteDatabase locationDb = myLocationDb.getReadableDatabase();
Calendar startDate = new GregorianCalendar();
// reset hour, minutes, seconds and millis
startDate.set(Calendar.HOUR_OF_DAY, 0);
startDate.set(Calendar.MINUTE, 0);
startDate.set(Calendar.SECOND, 0);
startDate.set(Calendar.MILLISECOND, 0);
//startDate.add(Calendar.DAY_OF_MONTH, -4);
startDate.set(Calendar.YEAR, year);
startDate.set(Calendar.MONTH, month);
startDate.set(Calendar.DAY_OF_MONTH, day);
Calendar endDate = new GregorianCalendar();
// reset hour, minutes, seconds and millis
endDate.set(Calendar.HOUR_OF_DAY, 0);
endDate.set(Calendar.MINUTE, 0);
endDate.set(Calendar.SECOND, 0);
endDate.set(Calendar.MILLISECOND, 0);
endDate.set(Calendar.YEAR, year);
endDate.set(Calendar.MONTH, month);
endDate.set(Calendar.DAY_OF_MONTH, day);
endDate.add(Calendar.DAY_OF_MONTH, 1);
String orderBy = COLUMN_TIME + " ASC";
Cursor cur = locationDb.query(LOCATION_TABLE_NAME, new String[] {COLUMN_ID, COLUMN_LATITUDE, COLUMN_LONGITUDE, COLUMN_TIME, COLUMN_SPEED, COLUMN_DISTANCE_TO_LAST_LOC},
COLUMN_TIME + " >= " + startDate.getTimeInMillis() + " AND " + COLUMN_TIME + " < " + endDate.getTimeInMillis(), null, null, null, orderBy);
int counter = 0;
cur.moveToFirst();
int nodeAdded = 1;
double latSum = 0;
double lngSum = 0;
double[] lastThreeLats = {0, 0, 0} ;
double[] lastThreeLngs = {0, 0, 0} ;
int ind = 0;
int points = 0;
double preLat = 0;
double preLng = 0;
double prePreLat = 0;
double prePreLng = 0;
double prePrePreLat = 0;
double prePrePreLng = 0;
if (cur.getCount() == 1){
prePrePreLat = cur.getDouble(1);
prePrePreLng = cur.getDouble(2);
prePreLat = cur.getDouble(1);
prePreLng = cur.getDouble(2);
preLat = cur.getDouble(1);
preLng = cur.getDouble(2);
} else if (cur.getCount() == 2){
prePrePreLat = cur.getDouble(1);
prePrePreLng = cur.getDouble(2);
cur.moveToNext();
prePreLat = cur.getDouble(1);
prePreLng = cur.getDouble(2);
preLat = cur.getDouble(1);
preLng = cur.getDouble(2);
} if (cur.getCount() == 3){
prePrePreLat = cur.getDouble(1);
prePrePreLng = cur.getDouble(2);
cur.moveToNext();
prePreLat = cur.getDouble(1);
prePreLng = cur.getDouble(2);
cur.moveToNext();
preLat = cur.getDouble(1);
preLng = cur.getDouble(2);
} else if (cur.getCount() > 3){
prePrePreLat = cur.getDouble(1);
prePrePreLng = cur.getDouble(2);
cur.moveToNext();
prePreLat = cur.getDouble(1);
prePreLng = cur.getDouble(2);
cur.moveToNext();
preLat = cur.getDouble(1);
preLng = cur.getDouble(2);
cur.moveToNext();
}
while (cur.isAfterLast() == false)
{
double currentLat = cur.getDouble(1);
double currentLng = cur.getDouble(2);
latLongArray.add(new LatLng((prePrePreLat + prePreLat + preLat + currentLat)/ 4, (prePrePreLng + prePreLng + preLng + currentLng)/4));
timeArray.add(cur.getLong(3));
distanceToLastArray.add(cur.getInt(5));
speedArray.add(cur.getInt(4));
prePrePreLat = prePreLat;
prePrePreLng = prePreLng;
prePreLat = preLat;
prePreLng = preLng;
preLat = cur.getDouble(1);
preLng = cur.getDouble(2);
cur.moveToNext();
nodeAdded++;
}
cur.close();
int rows = cur.getCount();
//shows the map only when there's records available
if (rows > 0){
DialogFragment mapFragment = MapDialogFragment.newInstance(latLongArray, timeArray, distanceToLastArray, speedArray);
mapFragment.setStyle(DialogFragment.STYLE_NORMAL, 1);
mapFragment.show(getFragmentManager(), "Dialog");
}
return rows;
}
第三，显示地图
public void onActivityCreated(Bundle savedInstanceState){
super.onActivityCreated(savedInstanceState);
int arraySize = inputLatLng.size();
final LatLng startPoint = inputLatLng.get(0);
final LatLng endPoint = inputLatLng.get(arraySize - 1);
GoogleMap map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map2)).getMap();
map.addMarker(new MarkerOptions().position(startPoint).title("Starting point"));
map.addMarker(new MarkerOptions().position(endPoint).title("Ending point"));
double latSum = 0;
double lngSum = 0;
for (int j=0; j<arraySize; j++){
latSum = inputLatLng.get(j).latitude + latSum;
lngSum = inputLatLng.get(j).longitude + lngSum;
}
LatLng center = new LatLng(latSum/arraySize, lngSum/arraySize);
map.moveCamera(CameraUpdateFactory.newLatLngZoom(center, 15));
map.animateCamera(CameraUpdateFactory.zoomTo(18), 2000, null);
ArrayList<Integer> Colors =new ArrayList<Integer> ();
Colors.add(Color.RED);
Colors.add(Color.BLACK);
Colors.add(Color.BLUE);
Colors.add(Color.GREEN);
Colors.add(Color.YELLOW);
for (int i=0; i<inputLatLng.size(); i++){
PolylineOptions plOptions = new PolylineOptions();
if ((i+1) == inputLatLng.size())
break;
//draw line every two points
plOptions.add(inputLatLng.get(i));
plOptions.add(inputLatLng.get(i+1));
plOptions.width(5);
float currentSpeed = speed.get(i);
if (currentSpeed == 0.0)
plOptions.color(Color.rgb(22, 139, 22));
else if (currentSpeed > 0.0 && currentSpeed < 1.0)
plOptions.color(Color.GREEN);
else if (currentSpeed >= 1.0 && currentSpeed < 2.0)
plOptions.color(Color.YELLOW);
else if (currentSpeed >= 2.0)
plOptions.color(Color.RED);
map.addPolyline(plOptions);
map.setMyLocationEnabled(true);
map.setMapType(GoogleMap.MAP_TYPE_NORMAL);
}
double travelledDistance = distanceTravelled(distanceToLast);
double travelledTime = timeTravelled(time);
travelledTime = Math.round(travelledTime * 100);
travelledTime = travelledTime/100;
double averageSpeed = travelledDistance / travelledTime;;
double highestSpeed = highestSpeed(speed);
setTextSize();
tvSpeed.setTextSize(averageSpeedTv);
tvDistance.setTextSize(distanceTv);
tvTime.setTextSize(timeTv);
tvHighestSpeed.setTextSize(highestSpeedTv);
tvSpeed.setText(getResources().getString(R.string.av_speed) + " " + String.format("%.2f", averageSpeed) + " km/h");
tvDistance.setText(getResources().getString(R.string.distance_travelled)+ " " + travelledDistance + " km");
tvTime.setText(getResources().getString(R.string.time_travelled) + " " + travelledTime + " h");
tvHighestSpeed.setText(getResources().getString(R.string.highest_speed) + " " + highestSpeed + " km/h");
}