我正在尝试在两个纬度和经度之间绘制路径。这是我的 MapsActivity.java。

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_maps);
        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        SupportMapFragment mapFragment = (SupportMapFragment)
getSupportFragmentManager()
                .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);

        find = (Button) findViewById(R.id.btnFindPath);
        or = (EditText) findViewById(R.id.etOrigin);
        dest = (EditText) findViewById(R.id.etDestination);


        find.setOnClickListener(new View.OnClickListener() {
            @Override

            public void onClick(View view) {

            sendRequest();

            }
        });
    }

    public void sendRequest(){

        String origin = or.getText().toString();
        String destination = dest.getText().toString();

        if(origin.isEmpty()){
            Toast.makeText(this,"Please Enter the Origin" , Toast.LENGTH_SHORT).show();
        }

        if(destination.isEmpty()){
            Toast.makeText(this,"Please Enter the Destination" , Toast.LENGTH_SHORT).show();
        }

        DirectionFinder directionFinder = new DirectionFinder(origin, destination);
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;

        /*double array [] = {44.968046 ,-94.420307 ,44.33328,-89.132008, 33.755787,-116.359998,33.844843,-116.54911 ,44.92057 ,-93.44786};
        // Add a marker in Sydney and move the camera
        for ( int i = 0 ; i< array.length ; i = i+2){

            LatLng place = new LatLng( array[i], array[i+1]);
            mMap.addMarker(new MarkerOptions().position(place).title("Marker in"+  i));
            mMap.moveCamera(CameraUpdateFactory.newLatLng(place));

        }

    }
}

我的 DirectionFinder.java 是:

     public DirectionFinder( String or , String dest) {



        if(or.equals("PRAN RFL")){
            double lat1 = 23.781388 ;
            double lon1 = 90.425500 ;
            LatLng origin = new LatLng( lat1, lon1);
        }

        if(dest.equals("Gulshan")){

            double lat2 = 23.780270 ;
            double lon2 = 23.780270 ;
            LatLng destination = new LatLng( lat2, lon2);

        }

        //this.listener = listener;
       // this.origin = origin;
       // this.destination = destination;
    }

    public void execute() throws UnsupportedEncodingException {
        listener.onDirectionFinderStart();
        new DownloadRawData().execute(createUrl());
    }

    private String createUrl() throws UnsupportedEncodingException {
        String urlOrigin = URLEncoder.encode(origin, "utf-8");
        String urlDestination = URLEncoder.encode(destination, "utf-8");

        return DIRECTION_URL_API + "origin=" + urlOrigin + "&destination=" + urlDestination + "&key=" + GOOGLE_API_KEY;
    }

    private class DownloadRawData extends AsyncTask<String, Void, String> {

        @Override
        protected String doInBackground(String... params) {
            String link = params[0];
            try {
                URL url = new URL(link);
                InputStream is = url.openConnection().getInputStream();
                StringBuffer buffer = new StringBuffer();
                BufferedReader reader = new BufferedReader(new InputStreamReader(is));

                String line;
                while ((line = reader.readLine()) != null) {
                    buffer.append(line + "\n");
                }

                return buffer.toString();

            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(String res) {
            try {
                parseJSon(res);
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
    }

    private void parseJSon(String data) throws JSONException {
        if (data == null)
            return;

        List<Route> routes = new ArrayList<Route>();
        JSONObject jsonData = new JSONObject(data);
        JSONArray jsonRoutes = jsonData.getJSONArray("routes");
        for (int i = 0; i < jsonRoutes.length(); i++) {
            JSONObject jsonRoute = jsonRoutes.getJSONObject(i);
            Route route = new Route();

            JSONObject overview_polylineJson = jsonRoute.getJSONObject("overview_polyline");
            JSONArray jsonLegs = jsonRoute.getJSONArray("legs");
            JSONObject jsonLeg = jsonLegs.getJSONObject(0);
            JSONObject jsonDistance = jsonLeg.getJSONObject("distance");
            JSONObject jsonDuration = jsonLeg.getJSONObject("duration");
            JSONObject jsonEndLocation = jsonLeg.getJSONObject("end_location");
            JSONObject jsonStartLocation = jsonLeg.getJSONObject("start_location");

            route.distance = new Distance(jsonDistance.getString("text"), jsonDistance.getInt("value"));
            route.duration = new Duration(jsonDuration.getString("text"), jsonDuration.getInt("value"));
            route.endAddress = jsonLeg.getString("end_address");
            route.startAddress = jsonLeg.getString("start_address");
            route.startLocation = new LatLng(jsonStartLocation.getDouble("lat"), jsonStartLocation.getDouble("lng"));
            route.endLocation = new LatLng(jsonEndLocation.getDouble("lat"), jsonEndLocation.getDouble("lng"));
            route.points = decodePolyLine(overview_polylineJson.getString("points"));

            routes.add(route);
        }

        listener.onDirectionFinderSuccess(routes);
    }

    private List<LatLng> decodePolyLine(final String poly) {
        int len = poly.length();
        int index = 0;
        List<LatLng> decoded = new ArrayList<LatLng>();
        int lat = 0;
        int lng = 0;

        while (index < len) {
            int b;
            int shift = 0;
            int result = 0;
            do {
                b = poly.charAt(index++) - 63;
                result |= (b & 0x1f) << shift;
                shift += 5;
            } while (b >= 0x20);
            int dlat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
            lat += dlat;

            shift = 0;
            result = 0;
            do {
                b = poly.charAt(index++) - 63;
                result |= (b & 0x1f) << shift;
                shift += 5;
            } while (b >= 0x20);
            int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
            lng += dlng;

            decoded.add(new LatLng(
                    lat / 100000d, lng / 100000d
            ));
        }

        return decoded;
    }
}

我的 Activity 布局是:

 <LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:map="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context="com.pran.trackingapp.MapsActivity"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"  >

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/etOrigin"
        android:hint="Enter origin address" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Enter destination address"
        android:id="@+id/etDestination" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Find path"
            android:id="@+id/btnFindPath" />
        <ImageView
            android:layout_marginLeft="20dp"
            android:layout_marginTop="5dp"
            android:layout_width="40dp"
            android:layout_height="40dp" />
        <TextView
            android:layout_marginLeft="5dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="0 km"
            android:id="@+id/tvDistance" />

        <ImageView
            android:layout_marginLeft="20dp"
            android:layout_marginTop="5dp"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:padding="5dp" />
        <TextView
            android:layout_marginLeft="5dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="0 min"
            android:id="@+id/tvDuration" />
    </LinearLayout>


    <fragment
        android:id="@+id/map"
        android:name="com.google.android.gms.maps.SupportMapFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

但是在点击按钮 findpath 之后它产生了错误: **

E/DynamiteModule: Failed to load DynamiteLoader: java.lang.ClassNotFoundException: Didn't find class "com.google.android.gms.dynamite.DynamiteModule$DynamiteLoaderClassLoader" on path: DexPathList[[zip file "/data/app/com.pran.trackingapp-2/base.apk"],nativeLibraryDirectories

** 我的 build.gradle(模块)是:

 apply plugin: 'com.android.application'

    android {
        compileSdkVersion 25
        buildToolsVersion "25.0.0"

        defaultConfig {
            applicationId "com.pran.trackingapp"
            minSdkVersion 16
            targetSdkVersion 25
            versionCode 1
            versionName "1.0"
        }
        buildTypes {
            release {
                minifyEnabled false
                proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
            }
        }
    }

    dependencies {
        compile fileTree(dir: 'libs', include: ['*.jar'])
        testCompile 'junit:junit:4.12'
        compile 'com.android.support:appcompat-v7:25.0.0'
        compile 'com.google.android.gms:play-services:9.8.0'
    }

我的 build.gradle(Project) 是:

  // Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.0.0'
        classpath 'com.google.gms:google-services:3.0.0'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

路径未绘制。我现在可以做什么？

最佳答案

在您应用的 gradle 文件中进行以下更改。

这个用于build.gradle(Project://你的项目名)

在依赖项中添加 classpath 'com.google.gms:google-services:3.0.0'

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.2.2'
        classpath 'com.google.gms:google-services:3.0.0'
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

这个是给你的 build.gradle (Module:app) 如果您没有使用来自 google expect maps 的其他服务，请不要添加此行 只需将其添加到文件的顶部或底部 apply plugin: 'com.google.gms.google-services'

希望对您有所帮助。

关于java - 为什么我在谷歌地图 "Failed to load DynamiteLoader: java.lang.ClassNotFoundException: Didn' 上找不到类时出现此错误？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40701107/