迫切需要向 android 项目添加说明

Question

我已经为此思考和上网天，但在 0 一周左右的生产力之后，我决定问这个模糊的问题。我的问题 - 谁能告诉我如何在我的 android 项目中实施指导？

为了详细说明，我在这里要求的确切功能在下一段中突出显示。

我的项目的目标：每当用户在一个位置键入内容（它会在单击“开始”后隐藏键盘），它会转到该位置并在那里放置一个标记。 然后它会显示当前位置和标记之间的最短旅行时间的路线。我不知道如何限制用户可以搜索位置的国家，但我很漂亮肯定会很容易。我已经有了我最终目标的点点滴滴，但不是我真正需要的。

最后这是我的 MainActivity。我已经引用了一些类我没有在这里添加所以，只需询问您是否需要它们运行在您自己的编译器中或其他地方使用此代码：

public class MainActivity extends FragmentActivity
        implements GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener {

    @SuppressWarnings("unused")
    private static final int CONNECTION_FAILURE_RESOLUTION_REQUEST = 9002;
    @SuppressWarnings("unused")
    private static final String LOGTAG = "Maps";

    private static final int GPS_ERRORDIALOG_REQUEST = 9001;
    private static final float DEFAULTZOOM = 15;
    private GoogleApiClient mGoogleApiClient;
    private LocationListener mListener;
    private Marker marker;

    ArrayList<LatLng> mMarkerPoints;
    GoogleMap mMap;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        if (servicesOK()) {
            setContentView(R.layout.activity_main);

            if (initMap()) {
                mGoogleApiClient = new GoogleApiClient.Builder(this)
                        .addApi(LocationServices.API)
                        .addConnectionCallbacks(this)
                        .addOnConnectionFailedListener(this)
                        .build();
            } else {
                Toast.makeText(this, "Hmmm. Maps didn't load.", Toast.LENGTH_SHORT).show();
            }
        } else {
            Toast.makeText(this, "There's something wrong with your play services", Toast.LENGTH_SHORT).show();
        }

        UiSettings config = mMap.getUiSettings();
        config.setMapToolbarEnabled(false);
        config.setZoomControlsEnabled(false);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {

            case R.id.legal:
                Intent intent = new Intent(this, LicenseActivity.class);
                startActivity(intent);
                break;

            default:
                break;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    protected void onStart() {
        super.onStart();
        mGoogleApiClient.connect();
    }

    @Override
    protected void onPause() {
        super.onPause();
        LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, mListener);
    }

    @Override
    protected void onResume() {
        super.onResume();
        MapStateManager mgr = new MapStateManager(this);
        CameraPosition position = mgr.getSavedCameraPosition();
        if (position != null) {
            CameraUpdate update = CameraUpdateFactory.newCameraPosition(position);
            mMap.moveCamera(update);
            mMap.setMapType(mgr.getSavedMapType());
        }
    }

    @Override
    protected void onStop() {
        super.onStop();
        MapStateManager mgr = new MapStateManager(this);
        mgr.saveMapState(mMap);
        if (mGoogleApiClient.isConnected()) {
            mGoogleApiClient.disconnect();
        }
    }

    public boolean servicesOK() {
        int isAvailable = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);

        if (isAvailable == ConnectionResult.SUCCESS) {
            return true;
        } else if (GooglePlayServicesUtil.isUserRecoverableError(isAvailable)) {
            Dialog dialog = GooglePlayServicesUtil.getErrorDialog(isAvailable, this, GPS_ERRORDIALOG_REQUEST);
            dialog.show();
        } else {
            Toast.makeText(this, "Can't connect to Google Play services", Toast.LENGTH_SHORT).show();
        }
        return false;
    }

    private boolean initMap() {
        if (mMap == null) {
            MapFragment mapFrag =
                    (MapFragment) getFragmentManager().findFragmentById(R.id.map);
            mMap = mapFrag.getMap();
        }
        return (mMap != null);
    }

    @SuppressWarnings("unused")
    private void gotoLocation(double lat, double lng) {
        LatLng ll = new LatLng(lat, lng);
        CameraUpdate update = CameraUpdateFactory.newLatLng(ll);
        mMap.moveCamera(update);
    }

    private void gotoLocation(double lat, double lng,
                              float zoom) {
        LatLng ll = new LatLng(lat, lng);
        CameraUpdate update = CameraUpdateFactory.newLatLngZoom(ll, zoom);
        mMap.moveCamera(update);
    }

    public void geoLocate(View v) throws IOException {

        EditText et = (EditText) findViewById(R.id.editText1);
        String location = et.getText().toString();
        if (location.length() == 0) {
            Toast.makeText(this, "Please enter a location", Toast.LENGTH_SHORT).show();
            return;
        }

        hideSoftKeyboard(v);

        Geocoder gc = new Geocoder(this);
        List<Address> list = gc.getFromLocationName(location, 1);
        Address add = list.get(0);
        String locality = add.getLocality();
        Toast.makeText(this, locality, Toast.LENGTH_LONG).show();

        double lat = add.getLatitude();
        double lng = add.getLongitude();

        gotoLocation(lat, lng, DEFAULTZOOM);

        if (marker != null) {
            marker.remove();
        }

        MarkerOptions options = new MarkerOptions()
                .position(new LatLng(lat, lng));
        marker = mMap.addMarker(options);
    }

    private void hideSoftKeyboard(View v) {
        InputMethodManager imm = (InputMethodManager) getSystemService(INPUT_METHOD_SERVICE);
        imm.hideSoftInputFromWindow(v.getWindowToken(), 0);
    }

    public void showCurrentLocation(MenuItem item) {
        int permCheck = ContextCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION);
        if (permCheck != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION}, 1);
        } else {
            Location currentlocation = LocationServices.FusedLocationApi
                    .getLastLocation(mGoogleApiClient);
            if (currentlocation == null) {
                Toast.makeText(this, "Couldn't find you!", Toast.LENGTH_SHORT).show();
            } else {
                LatLng latlng = new LatLng(
                        currentlocation.getLatitude(),
                        currentlocation.getLongitude()
                );
                CameraUpdate update = CameraUpdateFactory.newLatLngZoom(
                        latlng, 15
                );
                mMap.animateCamera(update);
            }
        }
    }

    @Override
    public void onConnected(@Nullable Bundle bundle) {
        int permCheck = ContextCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION);
        if (permCheck != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION}, 1);
        } else {
            Toast.makeText(this, "Go go go!", Toast.LENGTH_SHORT).show();

            mListener = new LocationListener() {
                @Override
                public void onLocationChanged(Location location) {
                    gotoLocation(location.getLatitude(), location.getLongitude(), 15);
                }
            };

            LocationRequest request = LocationRequest.create();
            request.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
            request.setInterval(20000);
            request.setFastestInterval(0);
            LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, request, mListener
            );
        }
    }

    @Override
    public void onConnectionSuspended(int i) {

    }

    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {

    }
}

Answer 1

在 github 上查看此图书馆：

jd-alexander/Google-Directions-Android

我在我的项目中使用它，您可以克隆它并根据您的特定需求进行修改。

乍一看，您在问题中的逻辑似乎很合理，但为了限制搜索位置，我可能只接受搜索框中的任何查询并进行比较，看看它是否在指定范围内 LatLngBounds你提供。

迫切需要向 android 项目添加说明

Desperately need to add directions to android project

android

google-maps

google-maps-markers

google-maps-api-2

google-directions-api