[英]Calculating the distance between two markers in Android
对于我当前正在使用的应用程序,我想设置一个按钮来查找google maps活动上两个标记之间的距离,当您单击该按钮时,它会显示您当前位置与另一个我不知道的标记之间的距离我的java类中没有用于按钮的任何代码,但是此刻,我只是想知道如何实际找到当前位置和设置标记之间的距离。 这是我用于查找用户当前位置的代码,它在随机位置中设置了标记。
package dashpage.example.com.myapplication;
import android.content.IntentSender;
import android.location.Location;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.util.Log;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
public class MapsActivity extends FragmentActivity implements
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
LocationListener {
public static final String TAG = MapsActivity.class.getSimpleName();
private final static int CONNECTION_FAILURE_RESOLUTION_REQUEST = 9000;
private GoogleMap mMap; // Might be null if Google Play services APK is not available.
private GoogleApiClient mGoogleApiClient;
private LocationRequest mLocationRequest;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
setUpMapIfNeeded();
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
// Create the LocationRequest object
mLocationRequest = LocationRequest.create()
.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
.setInterval(10 * 1000) // 10 seconds, in milliseconds
.setFastestInterval(1 * 1000); // 1 second, in milliseconds
}
@Override
protected void onResume() {
super.onResume();
setUpMapIfNeeded();
mGoogleApiClient.connect();
}
@Override
protected void onPause() {
super.onPause();
if (mGoogleApiClient.isConnected()) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
mGoogleApiClient.disconnect();
}
}
private void setUpMapIfNeeded() {
// Do a null check to confirm that we have not already instantiated the map.
if (mMap == null) {
// Try to obtain the map from the SupportMapFragment.
mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
.getMap();
// Check if we were successful in obtaining the map.
if (mMap != null) {
setUpMap();
}
}
}
private void setUpMap() {
mMap.addMarker(new MarkerOptions().position(new LatLng(53.3835, 6.5996)).title("Marker"));
}
private void handleNewLocation(Location location) {
Log.d(TAG, location.toString());
double currentLatitude = location.getLatitude();
double currentLongitude = location.getLongitude();
LatLng latLng = new LatLng(currentLatitude, currentLongitude);
//mMap.addMarker(new MarkerOptions().position(new LatLng(currentLatitude, currentLongitude)).title("Current Location"));
MarkerOptions options = new MarkerOptions()
.position(latLng)
.title("I am here!");
mMap.addMarker(options);
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
}
@Override
public void onConnected(Bundle bundle) {
Location location = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
if (location == null) {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
else {
handleNewLocation(location);
}
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
if (connectionResult.hasResolution()) {
try {
// Start an Activity that tries to resolve the error
connectionResult.startResolutionForResult(this, CONNECTION_FAILURE_RESOLUTION_REQUEST);
/*
* Thrown if Google Play services canceled the original
* PendingIntent
*/
} catch (IntentSender.SendIntentException e) {
// Log the error
e.printStackTrace();
}
} else {
/*
* If no resolution is available, display a dialog to the
* user with the error.
*/
Log.i(TAG, "Location services connection failed with code " + connectionResult.getErrorCode());
}
}
@Override
public void onLocationChanged(Location location) {
handleNewLocation(location);
}
}
我也知道,要在Android Studio中查找两个标记之间的距离,您可以使用类似
Location loc1 = new Location("");
loc1.setLatitude(lat1);
loc1.setLongitude(lon1);
Location loc2 = new Location("");
loc2.setLatitude(lat2);
loc2.setLongitude(lon2);
float distanceInMeters = loc1.distanceTo(loc2);
因此,我只是想知道是否有人能够帮助我实现用于查找距离的代码,因为我不确定该距离在我的课堂中应该走到哪里,还是我是否必须重做该课程的某些部分才能制作出距离?远程工作
尝试查找标记之间的距离时,建议将它们转换回Location
对象,以便能够使用内置的Android计算距离的方法。
给定您已设置的一些Marker marker
,并可以通过onMarkerClick()
或已经保存的Marker marker
以及当前位置Location currentLocation
,在Button
onClick(View v)
方法中:
LatLng markerLatLng = marker.getPosition();
Location markerLocation = new Location("");
markerLocation.setLatitude(markerLatLng.latitude);
markerLocation.setLongitude(markerLatLng.longitude);
currentLocation.distanceTo(markerLocation);
嗨,我举了一个例子,就像您的qquestion一样,但是您必须为自己的构建进行自定义。您可以使用Collections类,它简单而完美地工作。
Comparator<Sinemalar> comparator=new Comparator<Sinemalar>() {
@Override
public int compare(Sinemalar left, Sinemalar right) {
return (int)(left.getDistance()-right.getDistance());
}
};
Collections.sort(sinemalarList, comparator);
我希望为你工作
public float distanceCounter(String value, Context context) {
Location cinemaLocation = new Location("CinemaLocation");
String s = new String(value);
String[] result = s.split(",");
List<String> elephantList = Arrays.asList(s.split(","));
String longitude = elephantList.get(1);
String latitude = elephantList.get(0);
cinemaLocation.setLatitude(Double.parseDouble(latitude));
cinemaLocation.setLongitude(Double.parseDouble(longitude));
float distance = getCurrrentLocation(context).distanceTo(cinemaLocation)/1000 ;
return distance;
}
字符串值= 34.54665、23.54546
您可以在此处使用完整的代码。很抱歉,我忘记了。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.