android - 如何根据来自api的位置在android中的谷歌地图上移动标记

Question

我想放置另一个标记来显示不断移动的人的位置。我想随着人在谷歌地图上的移动更新标记，我已经从 https://stackoverflow.com/a/33885379/5324829 尝试过链接，但我无法在预定义位置为标记设置动画，有人可以帮我解决这个问题吗？提前致谢，这是我的代码..

    GoogleMap mGoogleMap;
    SupportMapFragment mapFrag;
    LocationRequest mLocationRequest;
    GoogleApiClient mGoogleApiClient;
    Location mLastLocation;
    Marker mCurrLocationMarker;
    boolean isFirstTime = true;
    private ArrayList<LatLng> markerPoints;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

//        getSupportActionBar().setTitle("Map Location Activity");
        //check for internet

        mapFrag = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
        mapFrag.getMapAsync(this);

        markerPoints = new ArrayList<LatLng>();


        //call web service to fetch location
         //on response call direction api
        //
    }

    @Override
    public void onPause() {
        super.onPause();

        //stop location updates when Activity is no longer active
        if (mGoogleApiClient != null) {
            LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
        }
    }

    @Override
    public void onMapReady(GoogleMap googleMap)
    {
        mGoogleMap=googleMap;
        mGoogleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);



        //Initialize Google Play Services
        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if (ContextCompat.checkSelfPermission(this,
                    Manifest.permission.ACCESS_FINE_LOCATION)
                    == PackageManager.PERMISSION_GRANTED) {
                //Location Permission already granted
                buildGoogleApiClient();
                mGoogleMap.setMyLocationEnabled(true);

                mGoogleMap.setOnMyLocationButtonClickListener(new GoogleMap.OnMyLocationButtonClickListener() {
                    @Override
                    public boolean onMyLocationButtonClick() {
                        LatLng latLng = new LatLng(mLastLocation.getLatitude(), mLastLocation.getLongitude());
                        CameraUpdate center =
                                CameraUpdateFactory.newLatLng(latLng);
                        CameraUpdate zoom = CameraUpdateFactory.zoomTo(15.0f);

                        mGoogleMap.moveCamera(center);
                        mGoogleMap.animateCamera(zoom);
                        return false;
                    }
                });

            } else {
                //Request Location Permission
                checkLocationPermission();
            }
        }
        else {
            buildGoogleApiClient();
            mGoogleMap.setMyLocationEnabled(true);
        }
    }

    protected synchronized void buildGoogleApiClient() {
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();
        mGoogleApiClient.connect();
    }

    @Override
    public void onConnected(Bundle bundle) {
        mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(1000);
        mLocationRequest.setFastestInterval(1000);
        mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
        if (ContextCompat.checkSelfPermission(this,
                Manifest.permission.ACCESS_FINE_LOCATION)
                == PackageManager.PERMISSION_GRANTED) {
            LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
        }
    }

    @Override
    public void onConnectionSuspended(int i) {}

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {}

    @Override
    public void onLocationChanged(Location location)
    {
        mLastLocation = location;
        if (mCurrLocationMarker != null) {
            mCurrLocationMarker.remove();
        }

        /*this condition is to set the map to the current location only for the first time,
        after onLocationChanged() method is called every second so it will move us to current location every second*/
        if (isFirstTime) {
            //Place current location marker
            LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
            /*MarkerOptions markerOptions = new MarkerOptions();
            markerOptions.position(latLng);
            markerOptions.title("Current Position");
            markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA));
            mCurrLocationMarker = mGoogleMap.addMarker(markerOptions);
            */

            CameraUpdate center =
                    CameraUpdateFactory.newLatLng(latLng);
            CameraUpdate zoom = CameraUpdateFactory.zoomTo(16.0f);

            mGoogleMap.moveCamera(center);
            mGoogleMap.animateCamera(zoom);
            //move map camera
            // mGoogleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng,15.0f));
            isFirstTime = false;
            markerPoints.add(new LatLng(23.0515539,72.5158113));
            markerPoints.add(new LatLng(23.0504289,72.5153713));
            markerPoints.add(new LatLng(23.0491435,72.5159617));
            markerPoints.add(new LatLng(23.0482305,72.5155917));
            markerPoints.add(new LatLng(23.0473917,72.5154952));

            Bitmap Icon = BitmapFactory.decodeResource(getResources(), R.mipmap.bus);
            setAnimation(mGoogleMap,markerPoints,Icon);
        }


    }

    public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;
    private void checkLocationPermission() {
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
                != PackageManager.PERMISSION_GRANTED) {

            // Should we show an explanation?
            if (ActivityCompat.shouldShowRequestPermissionRationale(this,
                    Manifest.permission.ACCESS_FINE_LOCATION)) {

                // Show an explanation to the user *asynchronously* -- don't block
                // this thread waiting for the user's response! After the user
                // sees the explanation, try again to request the permission.
                new AlertDialog.Builder(this)
                        .setTitle("Location Permission Needed")
                        .setMessage("This app needs the Location permission, please accept to use location functionality")
                        .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialogInterface, int i) {
                                //Prompt the user once explanation has been shown
                                ActivityCompat.requestPermissions(MainActivity.this,
                                        new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
                                        MY_PERMISSIONS_REQUEST_LOCATION );
                            }
                        })
                        .create()
                        .show();


            } else {
                // No explanation needed, we can request the permission.
                ActivityCompat.requestPermissions(this,
                        new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
                        MY_PERMISSIONS_REQUEST_LOCATION );
            }
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode,
                                           String permissions[], int[] grantResults) {
        switch (requestCode) {
            case MY_PERMISSIONS_REQUEST_LOCATION: {
                // If request is cancelled, the result arrays are empty.
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                    // permission was granted, yay! Do the
                    // location-related task you need to do.
                    if (ContextCompat.checkSelfPermission(this,
                            Manifest.permission.ACCESS_FINE_LOCATION)
                            == PackageManager.PERMISSION_GRANTED) {

                        if (mGoogleApiClient == null) {
                            buildGoogleApiClient();
                        }
                        mGoogleMap.setMyLocationEnabled(true);
                    }

                } else {

                    // permission denied, boo! Disable the
                    // functionality that depends on this permission.
                    Toast.makeText(this, "permission denied", Toast.LENGTH_LONG).show();
                }
                return;
            }

            // other 'case' lines to check for other
            // permissions this app might request
        }
    }



    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));

        myMap.animateCamera(CameraUpdateFactory.newLatLngZoom(directionPoint.get(0), 16));

        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 = 30000;

        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) {
                    // Post again 16ms later.
                    handler.postDelayed(this, 5);
                } else {
                    if (hideMarker) {
                        marker.setVisible(false);
                    } else {
                        marker.setVisible(true);
                    }
                }
            }
        });
    }

Answer 1

您可以将它用作从位置更改监听器中删除代码并将其放在按钮之类的地方只是为了检查目的，稍后您可以将它放在您的后台服务中。

btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                markerPoints.clear();

                markerPoints.add(new LatLng(23.049543, 72.517195));
                markerPoints.add(new LatLng(23.048457, 72.516787));
                markerPoints.add(new LatLng(23.048989, 72.516973));
                markerPoints.add(new LatLng(23.048263, 72.516667));
                markerPoints.add(new LatLng(23.047409, 72.516281));
                markerPoints.add(new LatLng(23.046219, 72.515696));

                Bitmap Icon = BitmapFactory.decodeResource(getResources(), R.mipmap.bus);
                setAnimation(mGoogleMap,markerPoints,Icon);
            }
        });


public static void setAnimation(GoogleMap myMap, final List<LatLng> directionPoint, final Bitmap bitmap) {

        myMap.clear();
        Marker marker = myMap.addMarker(new MarkerOptions()
                .icon(BitmapDescriptorFactory.fromBitmap(bitmap))
                .position(directionPoint.get(0))
                .flat(true));

        myMap.animateCamera(CameraUpdateFactory.newLatLngZoom(directionPoint.get(0), 16));

        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 = 30000;

        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) {
                    // Post again 16ms later.
                    handler.postDelayed(this, 150);
                } else {
                    if (hideMarker) {
                        marker.setVisible(false);
                    } else {
                        marker.setVisible(true);
                    }
                }
            }
        });
    }