如何使用Google Maps Android API在MapFragment中的两点之间绘制路线 [英] How to draw route between two points in MapFragment using Google Maps Android API
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问题描述
我的目标是在一堂课中完成以下任务.
My target is to complete the following tasks in one single class.
我想在Google Android Map API中的两个指针(导航抽屉中的当前位置和前缀位置)之间给出方向.
I want to give direction between two pointers (current location & prefixed location in navigation drawer) in Google Android Map API.
-
是否可以，或者我需要Directions API?不能在Android Maps API本身中完成导航吗?
Is it possible or do I need Directions API? Can't direction be done in Android Maps API itself?
我的目标是仅使用一个活动或java文件来完成所有任务，例如获取当前位置并在地图中显示目标指针(我已完成).现在，我想提供这两个指针的路由，并且当使用的前缀指针或位置更改时，路由必须更改.
My goal is to use only one activity or java file for all tasks like fetch current location and show the destination pointer in map (which I have done). Now I want to give the route for these two pointers and the route must change when the prefixed pointer or location is changed by the used.
以前缀开头，是指我在onNavigationItemSelected()的if else中已经给出的位置.
By prefixed, I mean the location I have already given in the if else in onNavigationItemSelected().
请参考以下代码，即MainActivity.java-我的目标是在一个Java类本身中完成所有任务.
Please refer the below code which is the MainActivity.java - My target is to complete all the tasks in one java class itself.
public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener, OnMapReadyCallback, LocationListener, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {
private GoogleMap mMap;
private GoogleApiClient client;
Location location;
LocationManager locationManager;
Marker marker;
String title;
String subTitle;
LatLng latLon;
double latitude;
double longitude;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
isConnectionAvailable();
isGpsAvailable();
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build();
}
private boolean isConnectionAvailable() {
boolean netCon = false;
try {
//Internet & network information "Object" initialization
ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
//Internet enable & connectivity checking
if ("WIFI".equals(networkInfo.getTypeName()) || "MOBILE".equals(networkInfo.getTypeName()) && networkInfo != null && networkInfo.isAvailable() && networkInfo.isConnectedOrConnecting()) {
netCon = true;
}
} catch (Exception e) {
new AlertDialog.Builder(this)
.setIcon(android.R.drawable.ic_dialog_alert)
.setTitle("No Network Connection!")
.setMessage("Please connect your device to either WiFi or switch on Mobile Data, operator charges may apply!")
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
finish();
}
}).show();
}
return netCon;
}
private boolean isGpsAvailable() {
boolean gpsCon = false;
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
Toast.makeText(this, "GPS is Enabled.", Toast.LENGTH_SHORT).show();
gpsCon = true;
} else {
new AlertDialog.Builder(this)
.setIcon(android.R.drawable.ic_dialog_alert)
.setTitle("GPS is disabled!")
.setMessage("Without GPS this application will not work! Would you like to enable the GPS?")
.setCancelable(false)
.setPositiveButton("Enable GPS", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Intent callGpsSetting = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(callGpsSetting);
}
})
.setNegativeButton("Exit.", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
finish();
}
})
.show();
}
return gpsCon;
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
client.disconnect();
super.onBackPressed();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.redBuilding){
latitude = 13.0827;
longitude = 80.2707;
title = "Chennai";
subTitle = "TN";
latLon = new LatLng(latitude, longitude);
}
mMap.clear();
mMap.addMarker(new MarkerOptions().position(latLon).title(title).snippet(subTitle)).showInfoWindow();
CameraPosition cameraPosition = new CameraPosition.Builder().target(latLon).tilt(30).zoom(20).build();
mMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
if (id == R.id.nav_share) {
} else if (id == R.id.nav_send) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
mMap.setMyLocationEnabled(true);
buildGoogleApiClient();
}
private synchronized void buildGoogleApiClient() {
client = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
client.connect();
}
public Action getIndexApiAction() {
Thing object = new Thing.Builder()
.setName("CEG") // TODO: Define a title for the content shown.
// TODO: Make sure this auto-generated URL is correct.
.setUrl(Uri.parse("http://[ENTER-YOUR-URL-HERE]"))
.build();
return new Action.Builder(Action.TYPE_VIEW)
.setObject(object)
.setActionStatus(Action.STATUS_TYPE_COMPLETED)
.build();
}
@Override
public void onStart() {
super.onStart();
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
client.connect();
AppIndex.AppIndexApi.start(client, getIndexApiAction());
}
@Override
public void onStop() {
super.onStop();
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
if (client.isConnected()) {
AppIndex.AppIndexApi.end(client, getIndexApiAction());
client.disconnect();
}
}
@Override
public void onConnected(Bundle bundle) {
location = LocationServices.FusedLocationApi.getLastLocation(client);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
LatLng latLon = new LatLng(latitude, longitude);
mMap.addMarker(new MarkerOptions().position(latLon)
.title("You are here.").snippet("Choose destination from menu to navigate.")
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA))
).showInfoWindow();
CameraPosition cameraPosition = new CameraPosition.Builder().target(latLon).tilt(30).zoom(20).build();
mMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onLocationChanged(Location location) {
location = location;
//Place current location marker
LatLng latLon = new LatLng(location.getLatitude(), location.getLongitude());
mMap.clear();
mMap.addMarker(new MarkerOptions().position(latLon)
.title("You are here.").snippet("Choose destination from menu to navigate.")
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA))
).showInfoWindow();
CameraPosition cameraPosition = new CameraPosition.Builder().target(latLon).tilt(30).zoom(20).build();
mMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
//stop location updates
if (client != null) {
LocationServices.FusedLocationApi.removeLocationUpdates(client, this);
}
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
public static final int MY_PERMISSIONS_REQUEST_LOCATION = 0;
public boolean checkLocationPermission() {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)!= PackageManager.PERMISSION_GRANTED) {
// Asking user if explanation is needed
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.
//Prompt the user once explanation has been shown
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, MY_PERMISSIONS_REQUEST_LOCATION);
} else {
// No explanation needed, we can request the permission.
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, MY_PERMISSIONS_REQUEST_LOCATION);
}
return false;
} else {
return true;
}
}
@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. Do the
// contacts-related task you need to do.
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
if (client == null) {
buildGoogleApiClient();
}
mMap.setMyLocationEnabled(true);
}
} else {
// Permission denied, 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.
// You can add here other case statements according to your requirement.
}
}
}
尽管有可用的解决方案，我还是想从类似的问题中重复一个原因是-我的目标是仅使用一个Java类，有些解决方案使用多个Java类和文件.
I would like to iterate the reason from my similar question in spite of available solutions is that - my target is to use only one java class, there are solutions using multiple java classes and files.
推荐答案
您将需要Direction api. 这是一个很好的教程:
You will need direction api. Here is good tutorial:
您可以将所有代码放在一个类中.但是最好使用多个类.
You can put all code in one class. But it is better to use multiple class.
这篇关于如何使用Google Maps Android API在MapFragment中的两点之间绘制路线的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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