我想显示当前位置标记和搜索后将指向的标记之间的路线（折线），但是我不知道该怎么做。
此刻，下面的代码就是我正在使用的代码。
用户搜索位置后，第二个标记将出现，然后出现第二个标记。
MapActivity类
package com.lrtapp.ardentmap;
import android.Manifest;
import android.content.pm.PackageManager;
import android.location.Location;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.AutoCompleteTextView;
import android.widget.ImageView;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.Status;
import com.google.android.gms.location.FusedLocationProviderClient;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.location.places.AutocompleteFilter;
import com.google.android.gms.location.places.Place;
import com.google.android.gms.location.places.ui.PlaceAutocompleteFragment;
import com.google.android.gms.location.places.ui.PlaceSelectionListener;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptor;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.LatLngBounds;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.maps.model.Polyline;
import com.google.android.gms.tasks.OnCompleteListener;
import java.util.List;
public class MapActivity extends AppCompatActivity implements OnMapReadyCallback,
GoogleApiClient.OnConnectionFailedListener{
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
@Override
public void onMapReady(GoogleMap googleMap) {
Toast.makeText(this, "map is ready", Toast.LENGTH_SHORT).show();
Log.d(TAG, "onMapReady: map is ready");
mMap = googleMap;
if (mLocationPermissionGranted) {
getDeviceLocation();
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
mMap.setMyLocationEnabled(true);
mMap.getUiSettings().setMyLocationButtonEnabled(false);
init();
}
}
private static final String TAG = "MapActivity";
private static final String FINE_LOCATION = Manifest.permission.ACCESS_FINE_LOCATION;
private static final String COURSE_LOCATION = Manifest.permission.ACCESS_COARSE_LOCATION;
private static final int LOCATION_PERMISSION_REQUEST_CODE = 1234;
private static final float DEFAULT_ZOOM = 15f;
private static final LatLngBounds LAT_LNG_BOUNDS = new LatLngBounds(
new LatLng(-40, -168), new LatLng(71, 136));
//widgets
private AutoCompleteTextView mSearchText;
private ImageView mGps;
Marker marker;
//vars
private boolean mLocationPermissionGranted = false;
private GoogleMap mMap;
private FusedLocationProviderClient mFusedLocationProviderClient;
//private PlaceAutocompleteAdapter mPlaceAutoCompleteAdapter;
private GoogleApiClient mGoogleApiClient;
PlaceAutocompleteFragment placeAutoComplete;
private List<Polyline> polylines;
private static final int[] COLORS = new int[]{R.color.primary_dark_material_light};
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map);
//mSearchText = (AutoCompleteTextView) findViewById(R.id.input_search);
mGps = (ImageView) findViewById(R.id.ic_gps);
getLocationPermission();
placeAutoComplete = (PlaceAutocompleteFragment) getFragmentManager().findFragmentById(R.id.place_autocomplete);
placeAutoComplete.setFilter(new AutocompleteFilter.Builder().setCountry("PH").build());
placeAutoComplete.setOnPlaceSelectedListener(new PlaceSelectionListener() {
@Override
public void onPlaceSelected(Place place) {
final LatLng latLngLoc = place.getLatLng();
//Log.d("Maps", "Place selected: " + place.getName());
if (marker!=null){
marker.remove();
}
marker = mMap.addMarker(new MarkerOptions().position(latLngLoc).title(place.getName().toString()));
mMap.animateCamera(CameraUpdateFactory.zoomTo(12), 2000, null);
}
@Override
public void onError(Status status) {
//Log.d("Maps", "An error occurred: " + status);
Toast.makeText(MapActivity.this, ""+status.toString(), Toast.LENGTH_SHORT).show();
}
});
init();
}
private void init(){
Log.d(TAG, "init: Initializing");
mGps.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.d(TAG, "onClick: clicked gps icon");
getDeviceLocation();
}
});
}
private void getDeviceLocation(){
Log.d(TAG, "getDeviceLocation: getting the device's current location.");
mFusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(this);
try {
if (mLocationPermissionGranted){
final com.google.android.gms.tasks.Task location = mFusedLocationProviderClient.getLastLocation();
location.addOnCompleteListener(new OnCompleteListener() {
@Override
public void onComplete(@NonNull com.google.android.gms.tasks.Task task) {
if(task.isSuccessful()){
Log.d(TAG, "Found Location");
Location currentLocation = (Location) task.getResult();
moveCamera(new LatLng(currentLocation.getLatitude(), currentLocation.getLongitude()),
DEFAULT_ZOOM,
"My Location");
}else{
Log.d(TAG, "onComplete: current Location is null");
Toast.makeText(MapActivity.this, "unable to get current location", Toast.LENGTH_SHORT).show();
}
}
});
}
}catch (SecurityException e){
Log.e(TAG, "getDeviceLocation: SecurityException: " + e.getMessage());
}
}
@Override
protected void finalize() throws Throwable {
super.finalize();
}
private void moveCamera(LatLng latLng, float zoom, String title){
BitmapDescriptor icon = BitmapDescriptorFactory.fromResource(R.mipmap.ic_testingonly);
Log.d(TAG, "moving the camera to: lat: " + latLng.latitude + ", lng: " +latLng.longitude);
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng,zoom));
if(!title.equals("My Location")){
MarkerOptions options = new MarkerOptions()
.position(latLng)
.title(title);
mMap.addMarker(options);
}
//hideSoftKeyboard();
}
private void initMap(){
Log.d(TAG, "initMap: initializing map");
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(MapActivity.this);
}
private void getLocationPermission(){
Log.d(TAG, "getLocationPermission: getting location permissions");
String[] permissions = {Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION};
if(ContextCompat.checkSelfPermission(this.getApplicationContext(), FINE_LOCATION) == PackageManager.PERMISSION_GRANTED){
if(ContextCompat.checkSelfPermission(this.getApplicationContext(), COURSE_LOCATION) == PackageManager.PERMISSION_GRANTED){
mLocationPermissionGranted = true;
initMap();
}else{
ActivityCompat.requestPermissions(this, permissions, LOCATION_PERMISSION_REQUEST_CODE);
}
}else{
ActivityCompat.requestPermissions(this, permissions, LOCATION_PERMISSION_REQUEST_CODE);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
Log.d(TAG, "onRequestPermissionsResult: called.");
mLocationPermissionGranted = false;
switch (requestCode){
case LOCATION_PERMISSION_REQUEST_CODE:{
if(grantResults.length > 0){
for(int i = 0; i < grantResults.length; i++){
if(grantResults[i] != PackageManager.PERMISSION_GRANTED){
mLocationPermissionGranted = false;
Log.d(TAG, "onRequestPermissionsResult: permission failed.");
return;
}
}
mLocationPermissionGranted = true;
Log.d(TAG, "onRequestPermissionsResult: permission granted.");
//initializing map
initMap();
}
}
}
}
}
我仍然是编程的初学者，并且在大多数时候，我坚持使用教程。
另一个问题：