android - 使用 Google Maps Android API v2 在 Google Maps 上绘制路线

Question

我有一个应用程序，我在其中使用 Google Plays map 新服务 API 持续跟踪用户的位置。我每秒钟都在更新位置，我也在检查用户 Activity ，如 STILL、TILTING、IN VEHICLE 等，以获得更好的位置跟踪。我可以使用我的代码绘制路径，但它不准确并且与用户实际驾驶/步行的道路有很大不同。它总是在远离实际用户路径的地方画线。

我的服务:-

public class MyService extends Service implements LocationListener {

    private final Context mContext;
    private static MyService mInstance = null;
    private final static String TAG = "RidingTimerService";

    boolean isGPSEnabled = false;

    private long mStartTime = 0L;
    private long timeInMilliseconds = 0L;
    private long timeSwapBuff = 0L;
    private long updatedTime = 0L;
    private Handler mHandler = null;
    private int mHours = 0;

    // Declaring a Location Manager
    private LocationManager mLocationManager = null;
    private Location mCurrentLocation = null; // location
    private double[][] positions;
    private long[] times;
    private final Integer data_points = 2; // how many data points to calculate
    private double mTravelledDistance = 0.0f;

    private SharedPreferences mPreferences = null;
    private ArrayList<LatLng> mDirectionsPoints = new ArrayList<LatLng>();

    public boolean mIsPhoneMoving = false;
    public int mActivityType = -1;
    int counter = 0;

    private IntentFilter mBroadcastFilter;
    private DetectionRequester mDetectionRequester;
    private DetectionRemover mDetectionRemover;

    public MyService() {
        mContext = this;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        mInstance = this;
        // two arrays for position and time.
        positions = new double[data_points][2];
        times = new long[data_points];

        mStartTime = SystemClock.uptimeMillis();
        mHandler = new Handler();
        mHandler.postDelayed(countDownTimerThread, 0);
        mPreferences = getSharedPreferences(MyPreferences.PREFERENCES,
                Context.MODE_PRIVATE);
        // Create a new Intent filter for the broadcast receiver
        mBroadcastFilter = new IntentFilter(
                MyConstants.ACTION_REFRESH_STATUS_LIST);
        mBroadcastFilter.addCategory(MyConstants.CATEGORY_LOCATION_SERVICES);

        // Get detection requester and remover objects
        mDetectionRequester = new DetectionRequester(this);
        mDetectionRemover = new DetectionRemover(this);
        mDirectionsPoints.clear();
    }

    /**
     * Pause the timer
     */
    public void pauseRide() {
        timeSwapBuff += timeInMilliseconds;
        mHandler.removeCallbacks(countDownTimerThread);
        mLocationManager.removeUpdates(this);
    }

    /**
     * Restart the timer
     */
    public void reStartRide() {
        mStartTime = SystemClock.uptimeMillis();
        mHandler.postDelayed(countDownTimerThread, 0);
        mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
                0, 0, this);
    }

    @Override
    public void onDestroy() {
        mHandler.removeCallbacks(countDownTimerThread);
        mLocationManager.removeUpdates(this);
        super.onDestroy();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        getLocation();
        return super.onStartCommand(intent, flags, startId);
    }

    /**
     * Timer thread
     */
    private final Runnable countDownTimerThread = new Runnable() {

        public void run() {
            mHours = 0;
            timeInMilliseconds = SystemClock.uptimeMillis() - mStartTime;
            updatedTime = timeSwapBuff + timeInMilliseconds;
            int secs = (int) (updatedTime / 1000);
            final int mins = secs / 60;
            mHours = mins / 60;
            secs = secs % 60;

            final Message msg = new Message();
            final Bundle bundle = new Bundle();
            bundle.putInt(MyPreferences.BROADCAST_CODES, 300);
            bundle.putString(
                    "time",
                    String.format("%02d", mHours) + ":"
                            + String.format("%02d", mins) + ":"
                            + String.format("%02d", secs));
            msg.setData(bundle);
            final Intent intent = new Intent(MyConstants.BROADCAST_INTENT);
            intent.putExtras(bundle);
            sendBroadcast(intent);
            mHandler.postDelayed(this, 1000);
        }
    };

    @Override
    public IBinder onBind(final Intent intent) {
        return null;
    }

    @Override
    public void onLocationChanged(final Location location) {
        if (location != null) {
            LocationUtils.sLatitude = location.getLatitude();
            LocationUtils.sLongitude = location.getLongitude();

            mDirectionsPoints.add(new LatLng(LocationUtils.sLatitude,
                    LocationUtils.sLongitude));
            riderLocation(location);
        } else {
            Log.i(TAG, "Location is not available.");
        }
    }

    /**
     * Calculate speed, distance and average speed. Send Broadcast which
     * received by activities
     * 
     * @param location
     */
    private void riderLocation(final Location location) {
        DecimalFormat formatter = new DecimalFormat("#0.00");
        double distance = 0.0;
        Double speed = 0.0;
        long t1 = 0l;
        final float[] results = new float[3];

        positions[counter][0] = location.getLatitude();
        positions[counter][1] = location.getLongitude();
        times[counter] = location.getTime();

        final Bundle bundle = new Bundle();
        bundle.putInt(MyPreferences.BROADCAST_CODES, 200);

        distance = calculateDistance(positions[counter][0],
                positions[counter][1], positions[(counter + (data_points - 1))
                        % data_points][0],
                positions[(counter + (data_points - 1)) % data_points][1]);

        Location.distanceBetween(positions[counter][0], positions[counter][1],
                positions[(counter + (data_points - 1)) % data_points][0],
                positions[(counter + (data_points - 1)) % data_points][1],
                results);

        mTravelledDistance += results[0] / 1000;
        LocationUtils.sDistance = formatter
                .format((mTravelledDistance * 100.0) / 100.0);

        final double averageSpeed = mTravelledDistance / mHours;
        LocationUtils.sAverageSpeed = formatter
                .format((averageSpeed * 100.0) / 100.0);

        if (location.hasSpeed()) {
            speed = location.getSpeed() * 3.6;
            LocationUtils.sSpeed = speed.intValue();
        } else {
            try {
                t1 = times[counter]
                        - times[(counter + (data_points - 1)) % data_points];
            } catch (final NullPointerException e) {
                // all good, just not enough data yet.
            }

            speed = (distance / t1) * 3.6;
            LocationUtils.sSpeed = speed.intValue();
            counter = (counter + 1) % data_points;
        }

        LocationUtils.sLatitude = location.getLatitude();
        LocationUtils.sLongitude = location.getLongitude();

        final Intent intent = new Intent(MyConstants.BROADCAST_INTENT);
        intent.putExtras(bundle);
        sendBroadcast(intent);
    }

    public void onProviderDisabled(final String arg0) {
        Toast.makeText(getApplicationContext(), "Gps Disabled",
                Toast.LENGTH_LONG).show();
    }

    public void onProviderEnabled(final String arg0) {
        Toast.makeText(getApplicationContext(), "Gps Enabled",
                Toast.LENGTH_SHORT).show();
    }

    /**
     * @return location
     */
    public Location getLocation() {
        try {
            mLocationManager = (LocationManager) getSystemService(LOCATION_SERVICE);

            // getting GPS status
            isGPSEnabled = mLocationManager
                    .isProviderEnabled(LocationManager.GPS_PROVIDER);

            if (!isGPSEnabled) {
                // no network provider is enabled
                showSettingsAlert();
            } else {
                // if GPS Enabled get lat/long using GPS Services
                if (isGPSEnabled) {
                    mLocationManager.requestLocationUpdates(
                            LocationManager.GPS_PROVIDER, 0, 0, this);
                    Log.d(TAG, "GPS Enabled");
                    if (mCurrentLocation == null) {
                        if (mLocationManager != null) {
                            mCurrentLocation = mLocationManager
                                    .getLastKnownLocation(LocationManager.GPS_PROVIDER);

                            if (mCurrentLocation != null) {
                                LocationUtils.sLatitude = mCurrentLocation
                                        .getLatitude();
                                LocationUtils.sLongitude = mCurrentLocation
                                        .getLongitude();
                            }
                        }
                    } else {
                        LocationUtils.sLatitude = mCurrentLocation
                                .getLatitude();
                        LocationUtils.sLongitude = mCurrentLocation
                                .getLongitude();
                    }
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

        return mCurrentLocation;
    }

    /**
     * @fn public static RidingTimerService getInstance()
     * @brief returns instance of the service.
     * @return RidingTimerService instance
     */
    public static MyService getInstance() {
        return mInstance;
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
    }

    /**
     * Reset all the values stored in Preferences
     */
    public void resetAllText() {
        mPreferences.edit().putString(MyPreferences.LATITUDE, "0.0").commit();
        mPreferences.edit().putString(MyPreferences.LONGITUDE, "0.0")
                .commit();
        mPreferences.edit().putString(MyPreferences.SPEED, "0.0").commit();
        mPreferences.edit().putString(MyPreferences.AVERAGE_SPEED, "0.0")
                .commit();
        mPreferences.edit().putString(MyPreferences.DISTANCE, "0.0").commit();
    }

    /**
     * Respond to "Start" button by requesting activity recognition updates.
     * 
     * @param view
     *            The view that triggered this method.
     */
    public void onStartUpdates() {
        // Pass the update request to the requester object
        mDetectionRequester.requestUpdates();
    }

    /**
     * Respond to "Stop" button by canceling updates.
     * 
     * @param view
     *            The view that triggered this method.
     */
    public void onStopUpdates() {
        // Pass the remove request to the remover object
        mDetectionRemover.removeUpdates(mDetectionRequester
                .getRequestPendingIntent());

        /*
         * Cancel the PendingIntent. Even if the removal request fails,
         * canceling the PendingIntent will stop the updates.
         */
        mDetectionRequester.getRequestPendingIntent().cancel();
    }

    /**
     * Function to show settings alert dialog On pressing Settings button will
     * lauch Settings Options
     * */
    public void showSettingsAlert() {
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
        alertDialog.setTitle("GPS");
        alertDialog.setMessage("GPS is not enabled. Do you want to enable it?");

        // On pressing Settings button
        alertDialog.setPositiveButton("Settings",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        Intent intent = new Intent(
                                Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                        mContext.startActivity(intent);
                    }
                });

        // on pressing cancel button
        alertDialog.setNegativeButton("Cancel",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.cancel();
                    }
                });

        // Showing Alert Message
        alertDialog.show();
    }

    /**
     * @return List of Direction points
     */
    public ArrayList<LatLng> getDirectionsPoints() {
        if (mDirectionsPoints != null) {
            return mDirectionsPoints;
        } else {
            mDirectionsPoints = new ArrayList<LatLng>();
            return mDirectionsPoints;
        }
    }

    /**
     * Calculate distance
     * 
     * @param lat1
     * @param lon1
     * @param lat2
     * @param lon2
     * @return
     */
    private double calculateDistance(final double lat1, final double lon1,
            final double lat2, final double lon2) {
        // haversine great circle distance approximation, returns meters
        final double theta = lon1 - lon2;
        double dist = Math.sin(deg2rad(lat1)) * Math.sin(deg2rad(lat2))
                + Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2))
                * Math.cos(deg2rad(theta));
        dist = Math.acos(dist);
        dist = rad2deg(dist);
        dist = dist * 60; // 60 nautical miles per degree of seperation
        dist = dist * 1852; // 1852 meters per nautical mile
        return dist;
    }

    private double deg2rad(final double deg) {
        return (deg * Math.PI / 180.0);
    }

    private double rad2deg(final double rad) {
        return (rad * 180.0 / Math.PI);
    }
}

我每 1 秒更新一次位置，每 3 秒更新一次 Activity 识别。我能够获取位置，但在 Google map 中未正确绘制路径。

绘制路径的代码:-

public class MapsActivity extends FragmentActivity {

    private static GoogleMap mGoogleMap = null;
    private static final String TAG = "MapsActivity";
    private Button mBtnStartRide, mBtnPauseRide, mBtnStopRide = null;
    private static TextView mTxtLatLong, mTxtTimer, mTxtTotalSize,
            mTxtSpeed = null;
    private static PolylineOptions mPolyLineOptions = null;
    // Storing the directions returned by the direcction api
    private SharedPreferences mPreferences = null;
    private MapsBroadcastReceiver receiver = null;

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

        receiver = new MapsBroadcastReceiver();
        mPreferences = getSharedPreferences(TestPreferences.PREFERENCES,
                Context.MODE_PRIVATE);

        mTxtLatLong = (TextView) findViewById(R.id.txtLatLong);
        mTxtTimer = (TextView) findViewById(R.id.txtTimer);
        mTxtTotalSize = (TextView) findViewById(R.id.txtDirectionsSize);
        mTxtSpeed = (TextView) findViewById(R.id.txtSpeed);

        mBtnStartRide = (Button) findViewById(R.id.btn_start_ride);
        mBtnPauseRide = (Button) findViewById(R.id.btn_pause_ride);
        mBtnStopRide = (Button) findViewById(R.id.btn_stop_ride);

        final Button mBtnCenter = (Button) findViewById(R.id.btn_center);
        mBtnCenter.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                animateCameraTo();
            }
        });

        mBtnStartRide.setOnClickListener(btnStartRideClickListener);
        mBtnPauseRide.setOnClickListener(btnPauseRideClickListener);
        mBtnStopRide.setOnClickListener(btnStopRideClickListener);

        initilizeMap();
    }

    /**
     * Start Ride Button Click Listener
     */
    private OnClickListener btnStartRideClickListener = new OnClickListener() {

        @Override
        public void onClick(View v) {
            if (mPreferences.getBoolean(TestPreferences.IS_RIDE_PAUSE, false)) {
                if (MyService.getInstance() != null) {
                    MyService.getInstance().reStartRide();
                }
            } else {
                startService(new Intent(MapsActivity.this,
                        MyService.class));
            }

            mPreferences.edit().putBoolean(TestPreferences.IS_RIDE_START, true)
                    .commit();
            mPreferences.edit().remove(TestPreferences.IS_RIDE_PAUSE).commit();
            mPreferences.edit().remove(TestPreferences.IS_RIDE_STOPPED)
                    .commit();

            mBtnStartRide.setVisibility(View.GONE);
            mBtnPauseRide.setVisibility(View.VISIBLE);
            mBtnStopRide.setVisibility(View.VISIBLE);
        }
    };

    /**
     * Start Ride Button Click Listener
     */
    private OnClickListener btnPauseRideClickListener = new OnClickListener() {

        @Override
        public void onClick(View v) {
            MyService.getInstance().pauseRide();

            mPreferences.edit().putBoolean(TestPreferences.IS_RIDE_PAUSE, true)
                    .commit();
            mPreferences.edit()
                    .putBoolean(TestPreferences.IS_RIDE_START, false).commit();
            mBtnStartRide.setVisibility(View.VISIBLE);
            mBtnPauseRide.setVisibility(View.GONE);
            mBtnStopRide.setVisibility(View.VISIBLE);
        }
    };

    /**
     * Stop Ride Button Click Listener
     */
    private OnClickListener btnStopRideClickListener = new OnClickListener() {

        @Override
        public void onClick(View v) {
            stopService(new Intent(MapsActivity.this, MyService.class));
            mPreferences.edit().remove(TestPreferences.IS_RIDE_PAUSE).commit();
            mPreferences.edit()
                    .putBoolean(TestPreferences.IS_RIDE_START, false).commit();
            mPreferences.edit()
                    .putBoolean(TestPreferences.IS_RIDE_STOPPED, true).commit();
            mBtnStartRide.setVisibility(View.VISIBLE);
            mBtnPauseRide.setVisibility(View.GONE);
            mBtnStopRide.setVisibility(View.GONE);
        }
    };

    @Override
    protected void onResume() {
        super.onResume();
        registerReceiver(receiver, new IntentFilter(
                MyConstants.BROADCAST_INTENT));
        initilizeMap();

        if (mPreferences.getBoolean(TestPreferences.IS_RIDE_START, false)) {
            mBtnStartRide.setVisibility(View.GONE);
            mBtnPauseRide.setVisibility(View.VISIBLE);
            mBtnStopRide.setVisibility(View.VISIBLE);
        } else if (mPreferences
                .getBoolean(TestPreferences.IS_RIDE_PAUSE, false)) {
            mBtnStartRide.setVisibility(View.VISIBLE);
            mBtnPauseRide.setVisibility(View.GONE);
            mBtnStopRide.setVisibility(View.VISIBLE);
        } else if (mPreferences.getBoolean(TestPreferences.IS_RIDE_STOPPED,
                false)) {
            // Show start button and gone Pause & Stop both
            mBtnStartRide.setVisibility(View.VISIBLE);
            mBtnPauseRide.setVisibility(View.GONE);
            mBtnStopRide.setVisibility(View.GONE);
        } else {
            // Show start button and gone Pause & Stop both
            mBtnStartRide.setVisibility(View.VISIBLE);
            mBtnPauseRide.setVisibility(View.GONE);
            mBtnStopRide.setVisibility(View.GONE);
        }

        setAllText();
    }

    @Override
    protected void onPause() {
        super.onPause();
        unregisterReceiver(receiver);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        mGoogleMap = null;
    }

    /**
     * Function to load map. If map is not created it will create it for you
     * */
    private void initilizeMap() {
        if (mGoogleMap == null) {
            mGoogleMap = ((MapFragment) getFragmentManager().findFragmentById(
                    R.id.map)).getMap();
            // check if map is created successfully or not
            if (mGoogleMap == null) {
                Toast.makeText(getApplicationContext(),
                        "Sorry! unable to create maps", Toast.LENGTH_SHORT)
                        .show();
            } else {
                mPolyLineOptions = new PolylineOptions().width(6).color(
                        Color.BLUE);
                mGoogleMap.setTrafficEnabled(true);
                mGoogleMap.getUiSettings().setMyLocationButtonEnabled(true);
                mGoogleMap.getUiSettings().setRotateGesturesEnabled(true);
                mGoogleMap.getUiSettings().setCompassEnabled(true);
                mGoogleMap.getUiSettings().setZoomGesturesEnabled(true);
                mGoogleMap.getUiSettings().setZoomControlsEnabled(true);

                if (MyService.getInstance() != null
                        && MyService.getInstance().getDirectionsPoints() != null
                        && !MyService.getInstance().getDirectionsPoints()
                                .isEmpty()
                        && MyService.getInstance().getDirectionsPoints()
                                .size() >= 1) {
                    mGoogleMap.addMarker(new MarkerOptions()
                            .position(
                                    MyService.getInstance()
                                            .getDirectionsPoints().get(0))
                            .anchor(0.8f, 1.0f).title("Your Location"));

                    animateCameraTo(MyService.getInstance()
                            .getDirectionsPoints().get(0).latitude,
                            MyService.getInstance().getDirectionsPoints()
                                    .get(0).longitude);
                }
            }
        } else {
            mPolyLineOptions = new PolylineOptions().width(6).color(Color.BLUE);
            mGoogleMap.getUiSettings().setMyLocationButtonEnabled(true);
            mGoogleMap.getUiSettings().setRotateGesturesEnabled(true);
            mGoogleMap.getUiSettings().setCompassEnabled(true);
            mGoogleMap.getUiSettings().setZoomGesturesEnabled(true);
            mGoogleMap.getUiSettings().setZoomControlsEnabled(true);

            if (MyService.getInstance() != null
                    && MyService.getInstance().getDirectionsPoints() != null
                    && !MyService.getInstance().getDirectionsPoints()
                            .isEmpty()
                    && MyService.getInstance().getDirectionsPoints().size() >= 1) {

                Log.i(TAG, "Lat long in resume2222222222 = "
                        + MyService.getInstance().getDirectionsPoints()
                                .get(0).latitude
                        + ", "
                        + MyService.getInstance().getDirectionsPoints()
                                .get(0).longitude);

                mGoogleMap.addMarker(new MarkerOptions()
                        .position(
                                MyService.getInstance().getDirectionsPoints()
                                        .get(0)).anchor(0.8f, 1.0f)
                        .title("Your Location"));

                animateCameraTo(MyService.getInstance().getDirectionsPoints()
                        .get(0).latitude, MyService.getInstance()
                        .getDirectionsPoints().get(0).longitude);
            }
        }
    }

    /**
     * @author Scorpion
     * 
     */
    private class MapsBroadcastReceiver extends BroadcastReceiver {

        @Override
        public void onReceive(Context context, Intent intent) {

            switch (intent.getExtras().getInt(TestPreferences.BROADCAST_CODES)) {
            case 100:
                showErrorDialog(intent.getExtras().getInt(
                        TestPreferences.BROADCAST_CODES));
                break;

            case 200:
                setAllText();
                break;

            case 300:
                if (intent.getExtras().getString("time") != null) {
                    mTxtTimer.setText("Timer - "
                            + intent.getExtras().getString("time"));
                } else {
                    mTxtTimer.setText("Timer - 00:00:00");
                }
                break;

            default:
                break;
            }

            if (MyService.getInstance() != null
                    && !MyService.getInstance().getDirectionsPoints()
                            .isEmpty()
                    && MyService.getInstance().getDirectionsPoints().size() == 1) {
                mGoogleMap.addMarker(new MarkerOptions()
                        .position(
                                MyService.getInstance().getDirectionsPoints()
                                        .get(0)).anchor(0.8f, 1.0f)
                        .title("Your Location"));
            }

        }
    }

    /**
     * 
     */
    public void setAllText() {
        mTxtLatLong.setText("Lat - " + LocationUtils.sLatitude + ", Lng - "
                + LocationUtils.sLongitude);

        mTxtSpeed.setText("Speed - " + LocationUtils.sSpeed);
        mTxtTotalSize.setText("Distance - " + LocationUtils.sDistance);
    }

    /**
     * Animate to position on Google Maps
     * 
     * @param lat
     * @param lng
     */
    private void animateCameraTo() {
        // Saving the points in a polyline

        if (MyService.getInstance() != null
                && MyService.getInstance().getDirectionsPoints() != null
                && !MyService.getInstance().getDirectionsPoints().isEmpty()) {
            mPolyLineOptions.geodesic(true);
            mPolyLineOptions.addAll(MyService.getInstance()
                    .getDirectionsPoints());

            // Drawing the path on the map Polyline route =
            mGoogleMap.addPolyline(mPolyLineOptions);

            int index = MyService.getInstance().getDirectionsPoints().size() - 1;
            CameraPosition cameraPosition = new CameraPosition.Builder()
                    .target(MyService.getInstance().getDirectionsPoints()
                            .get(index)).zoom(20).build();

            mGoogleMap.animateCamera(CameraUpdateFactory
                    .newCameraPosition(cameraPosition));
        }

    }

    /**
     * Animate to position on Google Maps
     * 
     * @param lat
     * @param lng
     */
    private void animateCameraTo(final double lat, final double lng) {
        // Saving the points in a polyline
        if (MyService.getInstance() != null
                && MyService.getInstance().getDirectionsPoints() != null
                && !MyService.getInstance().getDirectionsPoints().isEmpty()) {
            mPolyLineOptions.geodesic(true);
            mPolyLineOptions.addAll(MyService.getInstance()
                    .getDirectionsPoints());

            // Drawing the path on the map
            mGoogleMap.addPolyline(mPolyLineOptions);
            CameraPosition cameraPosition = new CameraPosition.Builder()
                    .target(new LatLng(lat, lng)).zoom(20).build();

            mGoogleMap.animateCamera(CameraUpdateFactory
                    .newCameraPosition(cameraPosition));
        }

    }

    /**
     * Show a dialog returned by Google Play services for the connection error
     * code
     * 
     * @param errorCode
     *            An error code returned from onConnectionFailed
     */
    private void showErrorDialog(int errorCode) {

        // Get the error dialog from Google Play services
        Dialog errorDialog = GooglePlayServicesUtil.getErrorDialog(errorCode,
                MapsActivity.this,
                LocationUtils.CONNECTION_FAILURE_RESOLUTION_REQUEST);

        // If Google Play services can provide an error dialog
        if (errorDialog != null) {

            // Create a new DialogFragment in which to show the error dialog
            ErrorDialogFragment errorFragment = new ErrorDialogFragment();

            // Set the dialog in the DialogFragment
            errorFragment.setDialog(errorDialog);

            // Show the error dialog in the DialogFragment
            errorFragment.show(getSupportFragmentManager(),
                    LocationUtils.APPTAG);
        }
    }
}

从位置提供者获得的坐标结果:-23.030392522689674, 72.5570888165469, 23.030408166940184, 72.55708600340783, 23.030451207802273, 72.55708215400317, 23.030448342522195, 72.5570607428365, 23.03045605637773, 72.55702903413072, 23.03046687434995, 72.55702007867455, 23.030481227996425, 72.55702017125606, 23.03049188235562, 72.55701618151457, 23.030501580461667, 72.55701051075931, 23.030506644074638, 72.55700568837983, 23.030510243171772, 72.55699463185964, 23.03051656621021, 72.55698811382064, 23.030523584332027, 72.55698589863236, 23.030527893257556, 72.5569835596, 23.03052731568596, 72.55698681171178, 23.030533706759005, 72.55699683791043, 23.03053795413862, 72.5570022232021, 23.03054422659466, 72.55700788646914, 23.030550353227323, 72.5570133047868, 23.03056167617575, 72.5570171806126, 23.030572274532982, 72.55702744953462, 23.03057623596164, 72.55703687229187, 23.03058756510295, 72.55703589208271, 23.030591797598742, 72.5570396833694, 23.030597556470788, 72.55703954449652, 23.030602030769657, 72.55704359454182, 23.030 606735158617, 72.55704993131606, 23.030611670633565, 72.55705060538087,23.030618875802222, 72.55705181604097, 23.030629137631596, 72.55705043471286, 23.030651405170016, 72.55705440295588, 23.03066642161307, 72.55705285209174, 23.030690454277963, 72.55703884780276, 23.030708214416187, 72.55703489882957, 23.03072341369183, 72.5570340196122, 23.030737371000015, 72.55703289416898, 23.03075088423441, 72.55703750535102, 23.030767572625837, 72.55704489874579, 23.030794398930176, 72.55703870239826, 23.03081655932613, 72.55702474270966, 23.030827505666753, 72.5570121351611, 23.03083720431765, 72.55700390084714, 23.03084624667527, 72.55700122660554, 23.030859495795887, 72.55699948514881, 23.030870357210333, 72.55699625144317, 23.030881843633054

Answer 1

这段代码可以工作

GoogleMap map;
   // ... get a map.
   // Add a thin red line from London to New York.
   Polyline line = map.addPolyline(new PolylineOptions()
       .add(new LatLng(51.5, -0.1), new LatLng(40.7, -74.0))
       .width(5)
       .color(Color.RED));