我正在尝试像ola这样的地图应用程序。我画了一条折线，但是当标记移动时我无法更新相机。此外，我没有得到适当的解决方案动画标记与折线。建议我妥善解决我的问题。
以下是代码：
公共类MainActivity扩展AppCompatActivity实现OnMapReadyCallback，View.OnClickListener {
private Context context;
GoogleMap googleMap;
Button btn_start;
Marker marker;
Polyline line;
List<LatLng> list;
LatLng startLatLng = new LatLng(43.182821, -99.292304);
LatLng endLatLng = new LatLng(44.959263, -97.580412);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
context = MainActivity.this;
btn_start = (Button) findViewById(R.id.btn_start);
String urlTopass = makeURL(startLatLng.latitude,
startLatLng.longitude, endLatLng.latitude,
endLatLng.longitude);
new connectAsyncTask(urlTopass).execute();
btn_start.setOnClickListener(this);
SupportMapFragment mapFragment =
(SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
@Override
public void onMapReady(GoogleMap mMap) {
googleMap = mMap;
CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(startLatLng, 9);
googleMap.animateCamera(cameraUpdate);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_start:
setAnimation(googleMap, list, ResourceUtils.getBitmap(context, R.drawable.ic_car_yellow_btg));
break;
default:
break;
}
}
private class connectAsyncTask extends AsyncTask<Void, Void, String> {
private ProgressDialog progressDialog;
String url;
connectAsyncTask(String urlPass) {
url = urlPass;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
progressDialog = new ProgressDialog(context);
progressDialog.setMessage("Fetching route, Please wait...");
progressDialog.setIndeterminate(true);
progressDialog.show();
}
@Override
protected String doInBackground(Void... params) {
JSONParser jParser = new JSONParser();
return jParser.getJSONFromUrl(url);
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
progressDialog.hide();
if (result != null) {
drawPath(result);
}
}
}
public String makeURL(double sourcelat, double sourcelog, double destlat,
double destlog) {
StringBuilder urlString = new StringBuilder();
urlString.append("http://maps.googleapis.com/maps/api/directions/json");
urlString.append("?origin=");// from
urlString.append(Double.toString(sourcelat));
urlString.append(",");
urlString.append(Double.toString(sourcelog));
urlString.append("&destination=");// to
urlString.append(Double.toString(destlat));
urlString.append(",");
urlString.append(Double.toString(destlog));
urlString.append("&sensor=true&mode=driving&alternatives=true");
Log.e("url ", " " + urlString);
return urlString.toString();
}
public class JSONParser {
InputStream is = null;
JSONObject jObj = null;
String json = "";
public JSONParser() {
}
public String getJSONFromUrl(String url) {
try {
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(
new InputStreamReader(is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line).append("\n");
}
json = sb.toString();
is.close();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
return json;
}
}
public void drawPath(String result) {
if (line != null) {
googleMap.clear();
}
googleMap.addMarker(new MarkerOptions().position(startLatLng).icon(
BitmapDescriptorFactory.fromBitmap(ResourceUtils.getBitmap(context, R.drawable.ic_car_yellow_btg))));
/*googleMap.addMarker(new MarkerOptions().position(startLatLng).icon(
BitmapDescriptorFactory.fromResource(R.drawable.car_red)));*/
try {
final JSONObject json = new JSONObject(result);
JSONArray routeArray = json.getJSONArray("routes");
JSONObject routes = routeArray.getJSONObject(0);
JSONObject overviewPolylines = routes
.getJSONObject("overview_polyline");
String encodedString = overviewPolylines.getString("points");
list = decodePoly(encodedString);
for (int z = 0; z < list.size() - 1; z++) {
LatLng src = list.get(z);
LatLng dest = list.get(z + 1);
line = googleMap.addPolyline(new PolylineOptions()
.add(new LatLng(src.latitude, src.longitude),
new LatLng(dest.latitude, dest.longitude))
.width(10).color(Color.BLUE).geodesic(true));
}
} catch (Exception e) {
e.printStackTrace();
}
}
private List<LatLng> decodePoly(String encoded) {
List<LatLng> poly = new ArrayList<>();
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 p = new LatLng((((double) lat / 1E5)), (((double) lng / 1E5)));
poly.add(p);
Log.e("coords", "LatLng " + p);
}
return poly;
}
public static void setAnimation(GoogleMap myMap, final List<LatLng> directionPoint, final Bitmap bitmap) {
Marker marker = myMap.addMarker(new MarkerOptions()
.icon(BitmapDescriptorFactory.fromBitmap(bitmap))
.position(directionPoint.get(0))
.flat(true));
/*PolylineOptions rectLine = new PolylineOptions().width(3).color(Color.RED);
for (int i = 0; i < directionPoint.size(); i++) {
rectLine.add(directionPoint.get(i));
}
myMap.moveCamera(CameraUpdateFactory.newLatLngBounds(builder.build(), 50));*/
animateMarker(myMap, marker, directionPoint, false);
}
private static void animateMarker(GoogleMap myMap, final Marker marker, final List<LatLng> directionPoint,
final boolean hideMarker) {
final Handler handler = new Handler();
final long start = SystemClock.uptimeMillis();
Projection proj = myMap.getProjection();
final long duration = 60000;
final Interpolator interpolator = new LinearInterpolator();
handler.post(new Runnable() {
int i = 0;
@Override
public void run() {
long elapsed = SystemClock.uptimeMillis() - start;
float t = interpolator.getInterpolation((float) elapsed
/ duration);
if (i < directionPoint.size())
marker.setPosition(directionPoint.get(i));
i++;
if (t < 1.0) {
handler.postDelayed(this, 24);
} else {
if (hideMarker) {
marker.setVisible(false);
} else {
marker.setVisible(true);
}
}
}
});
}
}
答案 0 :(得分：1)
首先你需要这个课程：
public interface LatLngInterpolator {
LatLng interpolate(float fraction, LatLng a, LatLng b);
class Linear implements LatLngInterpolator {
@Override
public LatLng interpolate(float fraction, LatLng a, LatLng b) {
double lat = (b.latitude - a.latitude) * fraction + a.latitude;
double lng = (b.longitude - a.longitude) * fraction + a.longitude;
return new LatLng(lat, lng);
}
}
class LinearFixed implements LatLngInterpolator {
@Override
public LatLng interpolate(float fraction, LatLng a, LatLng b) {
double lat = (b.latitude - a.latitude) * fraction + a.latitude;
double lngDelta = b.longitude - a.longitude;
// Take the shortest path across the 180th meridian.
if (Math.abs(lngDelta) > 180) {
lngDelta -= Math.signum(lngDelta) * 360;
}
double lng = lngDelta * fraction + a.longitude;
return new LatLng(lat, lng);
}
}
class Spherical implements LatLngInterpolator {
/* From github.com/googlemaps/android-maps-utils */
@Override
public LatLng interpolate(float fraction, LatLng from, LatLng to) {
// http://en.wikipedia.org/wiki/Slerp
double fromLat = toRadians(from.latitude);
double fromLng = toRadians(from.longitude);
double toLat = toRadians(to.latitude);
double toLng = toRadians(to.longitude);
double cosFromLat = cos(fromLat);
double cosToLat = cos(toLat);
// Computes Spherical interpolation coefficients.
double angle = computeAngleBetween(fromLat, fromLng, toLat, toLng);
double sinAngle = sin(angle);
if (sinAngle < 1E-6) {
return from;
}
double a = sin((1 - fraction) * angle) / sinAngle;
double b = sin(fraction * angle) / sinAngle;
// Converts from polar to vector and interpolate.
double x = a * cosFromLat * cos(fromLng) + b * cosToLat * cos(toLng);
double y = a * cosFromLat * sin(fromLng) + b * cosToLat * sin(toLng);
double z = a * sin(fromLat) + b * sin(toLat);
// Converts interpolated vector back to polar.
double lat = atan2(z, sqrt(x * x + y * y));
double lng = atan2(y, x);
return new LatLng(toDegrees(lat), toDegrees(lng));
}
private double computeAngleBetween(double fromLat, double fromLng, double toLat, double toLng) {
// Haversine's formula
double dLat = fromLat - toLat;
double dLng = fromLng - toLng;
return 2 * asin(sqrt(pow(sin(dLat / 2), 2) +
cos(fromLat) * cos(toLat) * pow(sin(dLng / 2), 2)));
}
}
}
然后您可以使用此类为标记设置动画：
public class MarkerAnimation {
private static final String TAG = MarkerAnimation.class.getSimpleName();
public static ArrayList<GetDirectionsAsync> getDirectionsAsyncs = new ArrayList<>();
static boolean isAnimationRunning = false;
public static void animateMarkerToGB(final Marker marker, final LatLng finalPosition, final LatLngInterpolator latLngInterpolator) {
final LatLng startPosition = marker.getPosition();
final Handler handler = new Handler();
final long start = SystemClock.uptimeMillis();
final Interpolator interpolator = new AccelerateDecelerateInterpolator();
final float durationInMs = 3000;
handler.post(new Runnable() {
long elapsed;
float t;
float v;
@Override
public void run() {
// Calculate progress using interpolator
elapsed = SystemClock.uptimeMillis() - start;
t = elapsed / durationInMs;
v = interpolator.getInterpolation(t);
marker.setPosition(latLngInterpolator.interpolate(v, startPosition, finalPosition));
// Repeat till progress is complete.
if (t < 1) {
// Post again 16ms later.
handler.postDelayed(this, 16);
}
}
});
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public static void animateMarkerToHC(final Marker marker, final LatLng finalPosition, final LatLngInterpolator latLngInterpolator) {
final LatLng startPosition = marker.getPosition();
ValueAnimator valueAnimator = new ValueAnimator();
valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
float v = animation.getAnimatedFraction();
LatLng newPosition = latLngInterpolator.interpolate(v, startPosition, finalPosition);
marker.setPosition(newPosition);
}
});
valueAnimator.setFloatValues(0, 1); // Ignored.
valueAnimator.setDuration(3000);
valueAnimator.start();
}
@TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
public static void animateMarkerToICS(Marker marker, LatLng finalPosition, final LatLngInterpolator latLngInterpolator) {
// List<LatLng> list = new ArrayList<>();
// list.add(finalPosition);
// animateMarkerToICSRecursive(marker, list, latLngInterpolator, true);
try {
animateMarkerToICSRecursive(marker, finalPosition, latLngInterpolator, true);
//if(MapUtils.distance(marker.getPosition(), finalPosition)
//< 100
// || MapUtils.distance(marker.getPosition(),
//finalPosition) > 500){
// List<LatLng> list = new ArrayList<>();
// animateMarkerToICSRecursive(marker, finalPosition,
//latLngInterpolator, true);
// }
// else{
// getDirectionsAsyncs.add(new
//GetDirectionsAsync(marker, finalPosition, latLngInterpolator));
// if(getDirectionsAsyncs.size() == 1){
// getDirectionsAsyncs.get(0).execute();
// }
// }
} catch (Exception e) {
e.printStackTrace();
try {
marker.setPosition(finalPosition);
} catch (Exception e1) {
e1.printStackTrace();
}
}
}
private static void checkAndExecute() {
if (getDirectionsAsyncs.size() > 0) {
getDirectionsAsyncs.get(0).execute();
}
}
@TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
public static void animateMarkerToICSRecursive(final Marker marker, final List<LatLng> list,
final LatLngInterpolator latLngInterpolator, final boolean rotation) {
if (list.size() > 0) {
final LatLng finalPosition = list.remove(0);
TypeEvaluator<LatLng> typeEvaluator = new TypeEvaluator<LatLng>() {
@Override
public LatLng evaluate(float fraction, LatLng startValue, LatLng endValue) {
return latLngInterpolator.interpolate(fraction, startValue, endValue);
}
};
Property<Marker, LatLng> property = Property.of(Marker.class, LatLng.class, "position");
ObjectAnimator animator = ObjectAnimator.ofObject(marker, property, typeEvaluator, finalPosition);
animator.setDuration((long) (10.0d * MapUtils.distance(marker.getPosition(), finalPosition)));
animator.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animator) {
isAnimationRunning = true;
}
@Override
public void onAnimationEnd(Animator animator) {
marker.setPosition(finalPosition);
isAnimationRunning = false;
if (list.size() > 0) {
animateMarkerToICSRecursive(marker, list, latLngInterpolator, rotation);
}
}
@Override
public void onAnimationCancel(Animator animator) {
}
@Override
public void onAnimationRepeat(Animator animator) {
}
});
if (rotation) {
//marker.setRotation((float) MapUtils.getBearing(marker.getPosition(), finalPosition));
MapUtils.rotateMarker(marker, (float) MapUtils.getBearing(marker.getPosition(), finalPosition));
}
if (!isAnimationRunning) {
animator.start();
}
}
}
@TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
public static void animateMarkerToICSRecursive(final Marker marker, final LatLng finalPosition,
final LatLngInterpolator latLngInterpolator, final boolean rotation) {
TypeEvaluator<LatLng> typeEvaluator = new TypeEvaluator<LatLng>() {
@Override
public LatLng evaluate(float fraction, LatLng startValue, LatLng endValue) {
return latLngInterpolator.interpolate(fraction, startValue, endValue);
}
};
Property<Marker, LatLng> property = Property.of(Marker.class, LatLng.class, "position");
ObjectAnimator animator = ObjectAnimator.ofObject(marker, property, typeEvaluator, finalPosition);
animator.setDuration((long) (1000));
animator.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animator) {
isAnimationRunning = true;
}
@Override
public void onAnimationEnd(Animator animator) {
marker.setPosition(finalPosition);
isAnimationRunning = false;
}
@Override
public void onAnimationCancel(Animator animator) {
}
@Override
public void onAnimationRepeat(Animator animator) {
}
});
if (rotation) {
//marker.setRotation((float) MapUtils.getBearing(marker.getPosition(), finalPosition));
MapUtils.rotateMarker(marker, (float) MapUtils.getBearing(marker.getPosition(), finalPosition));
}
if (!isAnimationRunning) {
animator.start();
}
}
static class GetDirectionsAsync extends AsyncTask<String, String, String> {
LatLng source, destination;
Marker marker;
LatLngInterpolator latLngInterpolator;
public GetDirectionsAsync(Marker marker, LatLng destination, LatLngInterpolator latLngInterpolator) {
this.source = marker.getPosition();
this.destination = destination;
this.marker = marker;
this.latLngInterpolator = latLngInterpolator;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected String doInBackground(String... strings) {
try {
Response response = RestClient.getGoogleApiServices().getDirections(source.latitude + "," + source.longitude,
destination.latitude + "," + destination.longitude, false, "driving", false);
String responseStr = new String(((TypedByteArray) response.getBody()).getBytes());
return responseStr;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
if (result != null) {
final List<LatLng> list = MapUtils.getLatLngListFromPath(result);
animateMarkerToICSRecursive(marker, list, latLngInterpolator, true);
}
getDirectionsAsyncs.remove(0);
checkAndExecute();
}
}
}
您需要传递上述类中路径的所有LatLng列表，如下所示：
MarkerAnimation.animateMarkerToICS(driverLocationMarker, destinationLatLng, new LatLngInterpolator.Spherical());
希望这有帮助
编辑：
这是标记旋转的代码： d public static void rotateMarker（final marker marker，final float toRotation）{ final Handler handler = new Handler（）; final long start = SystemClock.uptimeMillis（）; final float startRotation = marker.getRotation（）; 最后的持续时间= 700;
final Interpolator interpolator = new LinearInterpolator();
handler.post(new Runnable() {
@Override
public void run() {
long elapsed = SystemClock.uptimeMillis() - start;
float t = interpolator.getInterpolation((float) elapsed / duration);
float rot = t * toRotation + (1 - t) * startRotation;
marker.setRotation(-rot > 180 ? rot / 2 : rot);
if (t < 1.0) {
// Post again 16ms later.
handler.postDelayed(this, 16);
}
}
});
}