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我正在开发一个应用程序，其中一个活动定位当前的纬度和经度，然后从当前位置绘制一条折线到给定（硬编码）位置。但问题是该活动在 Android 4.x 上运行良好但不是即使我已正确包含支持库并使用了支持地图片段，姜饼也是如此。

当我在 4.x 以上运行我的活动时，它工作正常，但在姜饼上，活动开始，然后有时会出现标记，然后重新启动应用程序，有时甚至标记不会出现，并且在尝试 4-5 次后出现致命错误（不是总是）由操作系统显示（活动崩溃）。

我无法在此处发布我的 logcat，因为我无法使用 eclipse 调试我的应用程序，因为我找不到适用于我的设备的有效驱动程序。

代码片段是：

我的活动代码是

package si.scrolls2013;

import java.util.ArrayList;

import org.w3c.dom.Document;

import android.graphics.Color;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.widget.Toast;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.maps.model.PolylineOptions;

public class NavigationActivity extends FragmentActivity {

    // Google Map
    private GoogleMap googleMap;
    GMapV2Direction md;

    //Document
    Document doc;

    //location
    GPSTracker gps;

    LatLng fromPosition;
    LatLng toPosition = new LatLng(28.675751, 77.502818);
    double latitude;
    double longitude;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.map_activity);

        try {
            // Loading map
            initilizeMap();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    /**
     * function to load map. If map is not created it will create it for you
     * */
    private void initilizeMap() {

        md = new GMapV2Direction();
        googleMap = ((SupportMapFragment)getSupportFragmentManager()
                .findFragmentById(R.id.map)).getMap();

        gps = new GPSTracker(NavigationActivity.this);

        // check if GPS enabled     
        if(gps.canGetLocation()){

            latitude = gps.getLatitude();
            longitude = gps.getLongitude();
            Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show();    


        }else{
            // can't get location
            // GPS or Network is not enabled
            // Ask user to enable GPS/network in settings
            gps.showSettingsAlert();
        }

            fromPosition= new LatLng(latitude, longitude);

        LatLng coordinates = new LatLng(latitude, longitude);       
        googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(coordinates, 14));

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

        new MapDraw().execute();

    }




    @Override
    protected void onResume() {
        super.onResume();
        initilizeMap();
    }

    class MapDraw extends AsyncTask<String, String, String>
    {



        @Override
        protected String doInBackground(String... params) {
            doc = md.getDocument(fromPosition, toPosition, GMapV2Direction.MODE_DRIVING);
            md.getDurationValue(doc);
            md.getDistanceText(doc);
            md.getStartAddress(doc);
            md.getCopyRights(doc);

            return null;
        }

        protected void onPostExecute(String url)
        {
            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));
            }

            googleMap.addPolyline(rectLine);

        }
    }


}

清单文件是：

    <?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="si.scrolls2013"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />
         />



    <permission
        android:name="si.scrolls2013.permission.MAPS_RECEIVE"
        android:protectionLevel="signature" />

    <uses-permission android:name="si.scrolls2013.permission.MAPS_RECEIVE" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission                android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <!-- Required to show current location -->
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

    <!-- Required OpenGL ES 2.0. for Maps V2 -->
    <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="si.scrolls2013.MainActivity"
            android:label="@string/app_name" >
        </activity>
        <activity
            android:name="si.scrolls2013.Details"
            android:label="@string/app_name" >
        </activity>
        <activity
            android:name="si.scrolls2013.QueryActivity"
            android:label="@string/app_name" >
        </activity>
        <activity
            android:name="si.scrolls2013.TopicsActivity"
            android:label="@string/app_name" >
        </activity>
        <activity
            android:name="si.scrolls2013.NavigationActivity"
            android:label="@string/app_name" >
        </activity>
        <activity
            android:name="si.scrolls2013.IdCardDetails"
            android:label="@string/app_name" >
        </activity>
        <activity
            android:name="si.scrolls2013.IdCardActivity"
            android:label="@string/app_name" >
        </activity>
        <activity
            android:name="si.scrolls2013.Scrolls"
            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="xxxxx" />

        <uses-library
            android:name="com.google.android.maps"
            android:required="true" />
    </application>

</manifest>

导航活动的布局文件是：

        <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

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

</RelativeLayout>

编辑：

是否发现如果出现问题

新的 MapDraw().execute();

在活动中执行，如果我将其注释掉，则其他事情正常：

GMapV2Direction 类的代码是：

        package si.scrolls2013;

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

import android.content.Context;
import android.util.Log;

public class GMapV2Direction {
    public final static String MODE_DRIVING = "driving";
    public final static String MODE_WALKING = "walking";

    public GMapV2Direction() { }

    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;
    }

}

那么他们与 GMapV2Direction 类有什么兼容性问题吗？
`

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