谷歌地图中的方向
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【中文标题】谷歌地图中的方向【英文标题】：directions in google map 【发布时间】：2021-10-02 02:14:07 【问题描述】：我想在谷歌地图（android studio，java）中显示方向
package com.example.travel;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import android.Manifest;
import android.app.FragmentManager;
import android.content.DialogInterface;
import android.content.pm.PackageManager;
import android.location.Address;
import android.location.Geocoder;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import com.directions.route.AbstractRouting;
import com.directions.route.Route;
import com.directions.route.RouteException;
import com.directions.route.Routing;
import com.directions.route.RoutingListener;
import com.example.travel.items.SavePathInput;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.maps.CameraUpdate;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
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.maps.model.PolylineOptions;
import com.google.maps.DirectionsApiRequest;
import com.google.maps.GeoApiContext;
import com.google.maps.PendingResult;
import com.google.maps.internal.PolylineEncoding;
import com.google.maps.model.DirectionsResult;
import com.google.maps.model.DirectionsRoute;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;
import static androidx.constraintlayout.motion.utils.Oscillator.TAG;
public class MapActivity extends AppCompatActivity implements OnMapReadyCallback,RoutingListener,GoogleApiClient.OnConnectionFailedListener
private FragmentManager fragmentManager;
private MapFragment mapFragment;
private String email = MainActivity.useremail;
private GoogleMap mMap;
private Geocoder geocoder;
private Button button , bt_searchpath , bt_savepath;
private EditText editText;
Polyline polyline = null;
List<LatLng> latLngList = new ArrayList<>();
private ArrayList<UserLocation> clickedPath = new ArrayList<>();
private List<Polyline> polylines = null;
private String place;
private Retrofit retrofit;
private RetrofitInterface retrofitInterface;
public static String BASE_URL ;
private GeoApiContext mGeoApiContext = null;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map);
editText = (EditText) findViewById(R.id.editText);
button=(Button)findViewById(R.id.button);
bt_searchpath = (Button)findViewById(R.id.bt_pathsearch);
bt_savepath = (Button)findViewById(R.id.bt_pathsave);
retrofit = new Retrofit.Builder()
.baseUrl(BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.build();
retrofitInterface = retrofit.create(RetrofitInterface.class);
Intent intent = getIntent();
place = intent.getStringExtra("place");
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
if(mGeoApiContext == null)
mGeoApiContext = new GeoApiContext.Builder()
.apiKey(GoogleApikey)
.build();
bt_searchpath.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
if(latLngList.size() >= 3)
for (int i = 0; i < latLngList.size() - 2; i++)
//calculateDirections(latLngList.get(i) , latLngList.get(i+1));
else if(latLngList.size() == 2)
calculateDirections(latLngList.get(0) , latLngList.get(1));
else if(latLngList.size() == 1)
Toast.makeText(MapActivity.this, "click at least two places", Toast.LENGTH_SHORT).show();
);
private void calculateDirections(LatLng start , LatLng end)
Log.d(TAG, "calculateDirections: calculating directions.");
com.google.maps.model.LatLng destination = new com.google.maps.model.LatLng(
end.latitude,
end.longitude
);
DirectionsApiRequest directions = new DirectionsApiRequest(mGeoApiContext);
directions.alternatives(true);
directions.origin(
new com.google.maps.model.LatLng(
start.latitude,
start.longitude
)
);
Log.d(TAG, "calculateDirections: destination: " + destination.toString());
directions.destination(destination).setCallback(new PendingResult.Callback<DirectionsResult>()
@Override
public void onResult(DirectionsResult result)
Log.d(TAG, "onResult: routes: " + result.routes[0].toString());
Log.d(TAG, "onResult: duration :" + result.routes[0].legs[0].duration);
Log.d(TAG, "onResult: distance :" +result.routes[0].legs[0].distance);
Log.d(TAG, "onResult: geocodedWayPoints: " + result.geocodedWaypoints[0].toString());
addPolylinesToMap(result);
@Override
public void onFailure(Throwable e)
Log.e(TAG, "onFailure: " + e.getMessage() );
);
private void addPolylinesToMap(final DirectionsResult result)
new Handler(Looper.getMainLooper()).post(new Runnable()
@Override
public void run()
Log.d(TAG, "run: result routes: " + result.routes.length);
for(DirectionsRoute route: result.routes)
Log.d(TAG, "run: leg: " + route.legs[0].toString());
List<com.google.maps.model.LatLng> decodedPath = PolylineEncoding.decode(route.overviewPolyline.getEncodedPath());
List<LatLng> newDecodedPath = new ArrayList<>();
for(com.google.maps.model.LatLng latLng: decodedPath)
newDecodedPath.add(new LatLng(
latLng.lat,
latLng.lng
));
Polyline polyline = mMap.addPolyline(new PolylineOptions().addAll(newDecodedPath));
polyline.setColor(R.color.colorPrimaryDark);
polyline.setClickable(true);
);
@Override
public void onMapReady(GoogleMap googleMap)
mMap = googleMap;
geocoder = new Geocoder(this);
button.setOnClickListener(new Button.OnClickListener()
@Override
public void onClick(View v)
String str = editText.getText().toString();
List<Address> addressList = null;
try
addressList = geocoder.getFromLocationName(
str,
10);
catch (IOException e)
e.printStackTrace();
System.out.println(addressList.get(0).toString());
String []splitStr = addressList.get(0).toString().split(",");
String address = splitStr[0].substring(splitStr[0].indexOf("\"") + 1,splitStr[0].length() - 2);
System.out.println(address);
String latitude = splitStr[10].substring(splitStr[10].indexOf("=") + 1);
String longitude = splitStr[12].substring(splitStr[12].indexOf("=") + 1);
System.out.println(latitude);
System.out.println(longitude);
LatLng point = new LatLng(Double.parseDouble(latitude), Double.parseDouble(longitude));
MarkerOptions mOptions2 = new MarkerOptions();
mOptions2.title(str);
mOptions2.snippet(address);
mOptions2.position(point);
mMap.addMarker(mOptions2);
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(point,15));
UserLocation location = new UserLocation(str , latitude , longitude);
clickedPath.add(location);
LatLng latLng = new LatLng(Double.parseDouble(latitude), Double.parseDouble(longitude));
latLngList.add(latLng);
);
List<Address> addressList = null;
try
addressList = geocoder.getFromLocationName(
place,
10);
catch (IOException e)
e.printStackTrace();
String []splitStr = addressList.get(0).toString().split(",");
String latitude = splitStr[10].substring(splitStr[10].indexOf("=") + 1);
String longitude = splitStr[12].substring(splitStr[12].indexOf("=") + 1);
LatLng startCity = new LatLng(Double.parseDouble(latitude), Double.parseDouble(longitude));
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(startCity,13));
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.travel">
<uses-permission android:name="android:permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="@drawable/travel"
android:label="@string/app_name"
android:roundIcon="@drawable/travel"
android:supportsRtl="true"
android:theme="@style/Theme.Travel"
android:usesCleartextTraffic="true">
<activity android:name=".SplashActivity">
</activity>
<activity android:name=".OtherPathActivity" />
<activity android:name=".MapActivity" />
<activity android:name=".UserPathActivity" />
<activity android:name=".UserPlaceActivity" />
<activity android:name=".MainActivity" />
<activity android:name=".LoginActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<meta-data
android:name="com.google.android.geo.API_KEY"
android:value="my api key" />
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
</application>
</manifest>
plugins
id 'com.android.application'
android
compileSdkVersion 30
buildToolsVersion "30.0.3"
defaultConfig
applicationId "com.example.travel"
minSdkVersion 26
targetSdkVersion 30
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
buildTypes
release
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
compileOptions
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
dependencies
implementation 'com.github.jd-alexander:library:1.1.0'
implementation 'androidx.appcompat:appcompat:1.3.0'
implementation 'com.google.android.material:material:1.4.0'
implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
implementation 'com.google.android.gms:play-services-maps:17.0.1'
implementation 'com.google.android.libraries.places:places:2.4.0'
implementation 'com.google.maps.android:android-maps-utils:2.2.5'
implementation 'com.google.android.gms:play-services-location:18.0.0'
testImplementation 'junit:junit:4.+'
androidTestImplementation 'androidx.test.ext:junit:1.1.3'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
//google directions
implementation 'com.google.maps:google-maps-services:0.18.2'
implementation 'org.slf4j:slf4j-simple:1.7.25'
// Retrofit
implementation 'com.squareup.retrofit2:retrofit:2.6.2' //
implementation 'com.squareup.retrofit2:converter-gson:2.6.2'
implementation 'com.google.code.gson:gson:2.8.5' //GSON
implementation 'com.github.john990:WaveView:v0.9'
implementation 'com.github.bumptech.glide:glide:4.11.0'
在这个活动中，用户选择了两个以上的地方，这些地方被添加到 List latLngList 中。 单击“bt_searchpath”时，会调用“calculateDirections(LatLng start, LatLng end)”。 但是我看不到 direction.destination(destination).setCallback(new PendingResult.Callback() 中的日志，当然当我运行应用程序时，方向不会出现。
如何解决这个问题？ 感谢您的回答。
【问题讨论】：
你好，你找到解决办法了吗？ @pljni613 【参考方案1】：您是否已生成并连接了路线的 google api 密钥？并为此付出了代价？
【讨论】：
是的，我生成了 google api 密钥，它还包含方向 api（没有 API 密钥限制）。我没有付费，因为我注册了免费试用版。 我们可以免费创建和生成 api 密钥，但我们无法访问它，除非我们创建一个计费帐户.. 更多信息请参阅此处cloud.google.com/maps-platform/pricing***.com/questions/57313285/…***.com/questions/58665836/…以上是关于谷歌地图中的方向的主要内容，如果未能解决你的问题，请参考以下文章