0

私の英語でごめんなさい。

領域検出に関するアプリケーションを開発しています。GPSを介してAndroidデバイスの位置を検出したいのですが、ポリライン上にある場合、ユーザーに警告します。そのため、ポリラインをローカル ストレージに保持したいと考えています。

しかし、私はそれを維持する方法がわかりませんか？

私の解決策は次のとおりです。

  • データベースに始点と終点 (緯度、経度) を保持し、引数を maps.google.com に送信してノードにアクセスし、ドキュメントを作成してドキュメントからポリラインを作成します。

間違い - "Risk Zone" をクリックした後、実行できません。マップ上にマーカーのみが表示され、ポリラインは表示されません。そして、それはクラッシュします。

主な活動

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.protocol.HttpContext;

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

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.UiSettings;
import com.google.android.gms.maps.GoogleMap.OnMarkerClickListener;
import com.google.android.gms.maps.GoogleMapOptions;
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.GroundOverlayOptions;
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.PolylineOptions;

import android.R.color;
import android.content.Context;
import android.graphics.BitmapFactory.Options;
import android.graphics.Color;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;

import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends FragmentActivity {

    GoogleMap mMap;  
    GoogleMapOptions option;
    double lat=0;
    double lng=0;   
    Direction md;
    LatLng fromPosition = new LatLng(13.687140112679154, 100.53525868803263);
    LatLng toPosition = new LatLng(13.683660045847258, 100.53900808095932);
    PolylineOptions rectLine;   



    @Override
    protected void onCreate(Bundle savedInstanceState) {


        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);



        mMap = ((SupportMapFragment)getSupportFragmentManager()
                        .findFragmentById(R.id.map)).getMap();





        Button buttonNormal = (Button) findViewById(R.id.button1);
        buttonNormal.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
            }
        });

        Button buttonSatellite = (Button) findViewById(R.id.button2);
        buttonSatellite.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                mMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
            }
        });

        Button buttonTerrain = (Button) findViewById(R.id.button3);
        buttonTerrain.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                mMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN);
            }
        });

        Button buttonHybrid = (Button) findViewById(R.id.button4);
        buttonHybrid.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
            }
        });

        Button buttonLocate = (Button) findViewById(R.id.button7);
        buttonLocate.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                Criteria criteria = new Criteria();
                LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
                String provider = locationManager.getBestProvider(criteria, false);
                Location location = locationManager.getLastKnownLocation(provider);
                double lat =  location.getLatitude();
                double lng = location.getLongitude();
                LatLng coordinate = new LatLng(lat, lng);

                mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(
                        (coordinate), 15));
                mMap.addMarker(new MarkerOptions()
                        .position(coordinate)
                        .title("Prove")
                        .snippet("Family")
                        .draggable(true)
                        .icon(BitmapDescriptorFactory
                                .defaultMarker(BitmapDescriptorFactory.HUE_GREEN)));                

                mMap.setOnMarkerClickListener(new OnMarkerClickListener() {

                    @Override
                    public boolean onMarkerClick(Marker arg0) {
                        // TODO Auto-generated method stub
                        arg0.remove();
                        Toast.makeText(getApplicationContext(),
                                "Remove Marker" + String.valueOf(arg0.getId()),
                                Toast.LENGTH_SHORT).show();
                        return false;
                    }
                });

            }
        });


        /*Button buttonPoly = (Button) findViewById(R.id.button6);
        buttonPoly.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                PolylineOptions rectLine = new PolylineOptions().add(
                        new LatLng(lat, lng))
                        .add(new LatLng(lat + 0.00001, lng + 0.0001));

                mMap.addPolyline(rectLine);
            }
        });*/

        Button buttonDest = (Button) findViewById(R.id.button5);
        buttonDest.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {

                LatLng coordinates = new LatLng(13.685400079263206, 100.537133384495975);       
                mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(coordinates, 15));

                mMap.addMarker(new MarkerOptions().position(fromPosition).title("Start"));
                mMap.addMarker(new MarkerOptions().position(toPosition).title("End"));

                md=new Direction();         

                Document doc = md.getDocument(fromPosition, toPosition, md.MODE_DRIVING);
                int duration = md.getDurationValue(doc);
                String distance = md.getDistanceText(doc);
                String start_address = md.getStartAddress(doc);
                String copy_right = md.getCopyRights(doc);

                ArrayList<LatLng> directionPoint = md.getDirection(doc);
                PolylineOptions rectLine = new PolylineOptions().width(3).color(Color.RED);

                for(int i = 0 ; i < directionPoint.size() ; i++) {          
                    rectLine.add(directionPoint.get(i));
                }

                mMap.addPolyline(rectLine);


            }
        });




    }
}

方向.java

import java.io.InputStream;
import java.util.ArrayList;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.protocol.HttpContext;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import android.util.Log;

import com.google.android.gms.maps.model.LatLng;

public class Direction {
    public final static String MODE_DRIVING = "driving";
    public final static String MODE_WALKING = "walking";

    public Direction(){

    }

    public Document getDocument(LatLng start, LatLng end, String mode) {
        String url = "http://maps.googleapis.com/maps/api/directions/xml?" 
                + "origin=" + start.latitude + "," + start.longitude  
                + "&destination=" + end.latitude + "," + end.longitude 
                + "&sensor=false&units=metric&mode=driving";

        try {
            HttpClient httpClient = new DefaultHttpClient();
            HttpContext localContext = new BasicHttpContext();
            HttpPost httpPost = new HttpPost(url);
            HttpResponse response = httpClient.execute(httpPost, localContext);
            InputStream in = response.getEntity().getContent();
            DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
            Document doc = builder.parse(in);
            return doc;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public String getDurationText (Document doc) {
        NodeList nl1 = doc.getElementsByTagName("duration");
        Node node1 = nl1.item(0);
        NodeList nl2 = node1.getChildNodes();
        Node node2 = nl2.item(getNodeIndex(nl2, "text"));
        Log.i("DurationText", node2.getTextContent());
        return node2.getTextContent();
    }

    public int getDurationValue (Document doc) {
        NodeList nl1 = doc.getElementsByTagName("duration");
        Node node1 = nl1.item(0);
        NodeList nl2 = node1.getChildNodes();
        Node node2 = nl2.item(getNodeIndex(nl2, "value"));
        Log.i("DurationValue", node2.getTextContent());
        return Integer.parseInt(node2.getTextContent());
    }

    public String getDistanceText (Document doc) {
        NodeList nl1 = doc.getElementsByTagName("distance");
        Node node1 = nl1.item(0);
        NodeList nl2 = node1.getChildNodes();
        Node node2 = nl2.item(getNodeIndex(nl2, "text"));
        Log.i("DistanceText", node2.getTextContent());
        return node2.getTextContent();
    }

    public int getDistanceValue (Document doc) {
        NodeList nl1 = doc.getElementsByTagName("distance");
        Node node1 = nl1.item(0);
        NodeList nl2 = node1.getChildNodes();
        Node node2 = nl2.item(getNodeIndex(nl2, "value"));
        Log.i("DistanceValue", node2.getTextContent());
        return Integer.parseInt(node2.getTextContent());
    }

    public String getStartAddress (Document doc) {
        NodeList nl1 = doc.getElementsByTagName("start_address");
        Node node1 = nl1.item(0);
        Log.i("StartAddress", node1.getTextContent());
        return node1.getTextContent();
    }

    public String getEndAddress (Document doc) {
        NodeList nl1 = doc.getElementsByTagName("end_address");
        Node node1 = nl1.item(0);
        Log.i("StartAddress", node1.getTextContent());
        return node1.getTextContent();
    }

    public String getCopyRights (Document doc) {
        NodeList nl1 = doc.getElementsByTagName("copyrights");
        Node node1 = nl1.item(0);
        Log.i("CopyRights", node1.getTextContent());
        return node1.getTextContent();
    }

    public ArrayList<LatLng> getDirection (Document doc) {
        NodeList nl1, nl2, nl3;
        ArrayList<LatLng> listGeopoints = new ArrayList<LatLng>();
        nl1 = doc.getElementsByTagName("step");
        if (nl1.getLength() > 0) {
            for (int i = 0; i < nl1.getLength(); i++) {
                Node node1 = nl1.item(i);
                nl2 = node1.getChildNodes();

                Node locationNode = nl2.item(getNodeIndex(nl2, "start_location"));
                nl3 = locationNode.getChildNodes();
                Node latNode = nl3.item(getNodeIndex(nl3, "lat"));
                double lat = Double.parseDouble(latNode.getTextContent());
                Node lngNode = nl3.item(getNodeIndex(nl3, "lng"));
                double lng = Double.parseDouble(lngNode.getTextContent());
                listGeopoints.add(new LatLng(lat, lng));

                locationNode = nl2.item(getNodeIndex(nl2, "polyline"));
                nl3 = locationNode.getChildNodes();
                latNode = nl3.item(getNodeIndex(nl3, "points"));
                ArrayList<LatLng> arr = decodePoly(latNode.getTextContent());
                for(int j = 0 ; j < arr.size() ; j++) {
                    listGeopoints.add(new LatLng(arr.get(j).latitude, arr.get(j).longitude));
                }

                locationNode = nl2.item(getNodeIndex(nl2, "end_location"));
                nl3 = locationNode.getChildNodes();
                latNode = nl3.item(getNodeIndex(nl3, "lat"));
                lat = Double.parseDouble(latNode.getTextContent());
                lngNode = nl3.item(getNodeIndex(nl3, "lng"));
                lng = Double.parseDouble(lngNode.getTextContent());
                listGeopoints.add(new LatLng(lat, lng));
            }
        }

        return listGeopoints;
    }

    private int getNodeIndex(NodeList nl, String nodename) {
        for(int i = 0 ; i < nl.getLength() ; i++) {
            if(nl.item(i).getNodeName().equals(nodename))
                return i;
        }
        return -1;
    }

    private ArrayList<LatLng> decodePoly(String encoded) {
        ArrayList<LatLng> poly = new ArrayList<LatLng>();
        int index = 0, len = encoded.length();
        int lat = 0, lng = 0;
        while (index < len) {
            int b, shift = 0, result = 0;
            do {
                b = encoded.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 = encoded.charAt(index++) - 63;
                result |= (b & 0x1f) << shift;
                shift += 5;
            } while (b >= 0x20);
            int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
            lng += dlng;

            LatLng position = new LatLng((double) lat / 1E5, (double) lng / 1E5);
            poly.add(position);
        }
        return poly;
    }
}

activity_main.xml

<RelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"



    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <fragment     
        android:id="@+id/map"
        android:layout_width="match_parent"
        android:layout_height="match_parent"

        class="com.google.android.gms.maps.SupportMapFragment"/>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical" >

        <Button
            android:id="@+id/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/btn_normal"
            android:textSize="@dimen/textsize" />

        <Button
            android:id="@+id/button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/btn_satellite"
            android:textSize="@dimen/textsize" />

        <Button
            android:id="@+id/button3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/btn_terrain"
            android:textSize="@dimen/textsize" />

        <Button
            android:id="@+id/button4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/btn_hybrid"
            android:textSize="@dimen/textsize" />

        <Button
            android:id="@+id/button7"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:text="@string/btn_locate"
            android:textSize="@dimen/textsize" />

        <Button
            android:id="@+id/button5"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="@string/btn_destination"
            android:textSize="@dimen/textsize" />

    </LinearLayout>

</RelativeLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="app.Disthanitian.thaistyle.EmerMez"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission 
            android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
    <uses-permission android:name="com.example.googlemapsv2.permission.MAPS_RECEIVE"/>

    <permission 
        android:name="com.example.googlemapsv2.permission.MAPS_RECEIVE"
        android:protectionLevel="signature"/>

    <uses-feature android:glEsVersion="0x00020000" android:required="true"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme">
        <activity
            android:name="app.Disthanitian.thaistyle.EmerMez.MainActivity"
            android:label="@string/app_name" >
            <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.maps.v2.API_KEY"
           android:value="AIzaSyBzRmlT-LnuOeDHpxByJJVq8cxc39JTDGg"/>
    </application>

</manifest>

ログキャット

      06-06 10:35:34.032: I/ADM(1710): 2:   825935789: [INFO] hw_handler_u8500:849 Query: SELECT * FROM HW_Settings WHERE (Platform = 'AB8500') AND ('REF_Speaker_Playback_Music' IN (Dev1, Dev2, Dev3, Dev4, Dev5, Dev6))ORDER BY rowid LIMIT 1
06-06 10:35:34.052: W/System.err(6196): android.os.NetworkOnMainThreadException
06-06 10:35:34.052: W/System.err(6196):     at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1118)
06-06 10:35:34.052: W/System.err(6196):     at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
06-06 10:35:34.052: W/System.err(6196):     at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
06-06 10:35:34.062: W/System.err(6196):     at java.net.InetAddress.getAllByName(InetAddress.java:214)
06-06 10:35:34.062: W/System.err(6196):     at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
06-06 10:35:34.062: W/System.err(6196):     at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
06-06 10:35:34.062: W/System.err(6196):     at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
06-06 10:35:34.062: W/System.err(6196):     at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
06-06 10:35:34.062: W/System.err(6196):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
06-06 10:35:34.062: W/System.err(6196):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
06-06 10:35:34.072: W/System.err(6196):     at app.Disthanitian.thaistyle.EmerMez.Direction.getDocument(Direction.java:41)
06-06 10:35:34.072: W/System.err(6196):     at app.Disthanitian.thaistyle.EmerMez.MainActivity$6.onClick(MainActivity.java:175)
06-06 10:35:34.072: W/System.err(6196):     at android.view.View.performClick(View.java:4162)
06-06 10:35:34.072: W/System.err(6196):     at android.view.View$PerformClick.run(View.java:17082)
06-06 10:35:34.072: W/System.err(6196):     at android.os.Handler.handleCallback(Handler.java:615)
06-06 10:35:34.072: W/System.err(6196):     at android.os.Handler.dispatchMessage(Handler.java:92)
06-06 10:35:34.072: W/System.err(6196):     at android.os.Looper.loop(Looper.java:137)
06-06 10:35:34.072: W/System.err(6196):     at android.app.ActivityThread.main(ActivityThread.java:4867)
06-06 10:35:34.072: W/System.err(6196):     at java.lang.reflect.Method.invokeNative(Native Method)
06-06 10:35:34.082: W/System.err(6196):     at java.lang.reflect.Method.invoke(Method.java:511)
06-06 10:35:34.082: W/System.err(6196):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1007)
06-06 10:35:34.082: W/System.err(6196):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:774)
06-06 10:35:34.082: W/System.err(6196):     at dalvik.system.NativeStart.main(Native Method)
06-06 10:35:34.082: D/AndroidRuntime(6196): Shutting down VM
06-06 10:35:34.082: W/dalvikvm(6196): threadid=1: thread exiting with uncaught exception (group=0x41c612a0)
06-06 10:35:34.092: E/AndroidRuntime(6196): FATAL EXCEPTION: main
06-06 10:35:34.092: E/AndroidRuntime(6196): java.lang.NullPointerException
06-06 10:35:34.092: E/AndroidRuntime(6196):     at app.Disthanitian.thaistyle.EmerMez.Direction.getDurationValue(Direction.java:62)
06-06 10:35:34.092: E/AndroidRuntime(6196):     at app.Disthanitian.thaistyle.EmerMez.MainActivity$6.onClick(MainActivity.java:176)
06-06 10:35:34.092: E/AndroidRuntime(6196):     at android.view.View.performClick(View.java:4162)
06-06 10:35:34.092: E/AndroidRuntime(6196):     at android.view.View$PerformClick.run(View.java:17082)
06-06 10:35:34.092: E/AndroidRuntime(6196):     at android.os.Handler.handleCallback(Handler.java:615)
06-06 10:35:34.092: E/AndroidRuntime(6196):     at android.os.Handler.dispatchMessage(Handler.java:92)
06-06 10:35:34.092: E/AndroidRuntime(6196):     at android.os.Looper.loop(Looper.java:137)
06-06 10:35:34.092: E/AndroidRuntime(6196):     at android.app.ActivityThread.main(ActivityThread.java:4867)
06-06 10:35:34.092: E/AndroidRuntime(6196):     at java.lang.reflect.Method.invokeNative(Native Method)
06-06 10:35:34.092: E/AndroidRuntime(6196):     at java.lang.reflect.Method.invoke(Method.java:511)
06-06 10:35:34.092: E/AndroidRuntime(6196):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1007)
06-06 10:35:34.092: E/AndroidRuntime(6196):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:774)
06-06 10:35:34.092: E/AndroidRuntime(6196):     at dalvik.system.NativeStart.main(Native Method)
06-06 10:35:34.092: I/ADM(1710): 8:   825995695: [INFO] hw_handler_u8500:961 ste_adm_hw_handler_u8500: Found matching HW-settings: devices = ('REF_Speaker_Playback_Music', '', '', '', '', ''), d2dlogical-connections = ('', '', '', '').
06-06 10:35:34.162: I/ADM(1710): 7:   826061094: [INFO] dev:429 Device Speaker is OUTPUT
06-06 10:35:34.162: I/ADM(1710): 9:   826061186: [INFO] dev_omx:1276 Enter dev_omx_setup_graph - device=Speaker, samplerate=44100, format=2, alloc_buffers=0, is_vc=0, bufsz=0
06-06 10:35:34.162: E/android.os.Debug(2035): !@Dumpstate > dumpstate -k -t -z -d -o /data/log/dumpstate_app_error
4

2 に答える 2

1

あなたの Direction.java は f9 のようです...しかし、ボタンのクリックで実行しようとしているコードであるMainActivityを変更する必要があります.. AsynTask を介して実行し (つまり、AsyncTask を拡張する必要があるプライベート クラスを作成します)、execute を呼び出します() ボタンをクリックすると、この非同期クラスの...!!!

これにより、 06-06 10:35:34.052: W/System.err(6196): android.os.NetworkOnMainThreadException エラーが確実に解決されます 。うまくいけば、この wud は「java.lang.NullPointerException」などの例外も解決します。コードが NetworkException をスローすると、「doc」オブジェクト自体が null になる可能性があり、さらに null 応答が返されるため、例外が発生する可能性があります。 「doc」 -obj 依存関係があります...!!!

以下に、同じことを参照できるコードスニペットを添付しました..!! 詳細をフォローアップしたい場合は、この「google-maps v2 でルートを表示」を参照してください。

 private class showRoute extends AsyncTask<Void, Void, Document>{       
            Document doc; 
            PolylineOptions rectLine;       

                    @Override
            protected Document doInBackground(Void... params) {    
            doc = md.getDocument(fromPosition, toPosition, GMapV2Direction.MODE_DRIVING);    
        ArrayList<LatLng> directionPoint = md.getDirection(doc);
            rectLine = new PolylineOptions().width(3).color(Color.RED);

            for(int i = 0 ; i < directionPoint.size() ; i++) {              
               rectLine.add(directionPoint.get(i));
            }           
               return null;
            }

            @Override
            protected void onPostExecute(Document result) {         
              mMap.addPolyline(rectLine);
            }   

        }
于 2013-10-04T17:12:37.097 に答える