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プログラムはエラーではありませんが、インデックス配列リストに関するlogcatエラーなので、解決できません。私を助けてください。 

public class MainActivity extends MapActivity {

@Override

public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.main);

    MapView mv = (MapView) findViewById(R.id.mapview);

    mv.setBuiltInZoomControls(true);

    MapController mc = mv.getController();

    ArrayList all_geo_points = getDirections(16.821219, 100.260457, 13.913698, 100.510954);

    GeoPoint moveTo = (GeoPoint) all_geo_points.get(0);

    mc.animateTo(moveTo);

    mc.setZoom(12);

    mv.getOverlays().add(new MyOverlay(all_geo_points));

}


@Override

protected boolean isRouteDisplayed() {


    return false;

}



public static ArrayList getDirections(double lat1, double lon1, double lat2, double lon2) {

    String url = "http://maps.googleapis.com/maps/api/directions/xml?origin=" +lat1 + "," + lon1  + "&destination=" + lat2 + "," + lon2 + "&sensor=false&units=metric";

    String tag[] = { "lat", "lng" };

    ArrayList list_of_geopoints = new ArrayList();

    HttpResponse response = null;

    try {

        HttpClient httpClient = new DefaultHttpClient();

        HttpContext localContext = new BasicHttpContext();

        HttpPost httpPost = new HttpPost(url);

        response = httpClient.execute(httpPost, localContext);

        InputStream in = response.getEntity().getContent();

        DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();

        Document doc = builder.parse(in);

        if (doc != null) {

            NodeList nl1, nl2;

            nl1 = doc.getElementsByTagName(tag[0]);
            nl2 = doc.getElementsByTagName(tag[1]);

            if (nl1.getLength() > 0) {

                list_of_geopoints = new ArrayList();

                for (int i = 0; i < nl1.getLength(); i++) {

                    Node node1 = nl1.item(i);

                    Node node2 = nl2.item(i);

                    double lat = Double.parseDouble(node1.getTextContent());

                    double lng = Double.parseDouble(node2.getTextContent());

                    list_of_geopoints.add(new GeoPoint((int) (lat * 1E6), (int) (lng * 1E6)));

                }

            } else {
                // No points found
            }

        }

    } catch (Exception e) {

        e.printStackTrace();

    }

    return list_of_geopoints;

}

public class MyOverlay extends Overlay {


    private ArrayList all_geo_points;

    public MyOverlay(ArrayList allGeoPoints) {

        super();

      this.all_geo_points = allGeoPoints;

    }


    @Override

    public boolean draw(Canvas canvas, MapView mv, boolean shadow, long when) {

        super.draw(canvas, mv, shadow);

        drawPath(mv, canvas);

        return true;

    }

    public void drawPath(MapView mv, Canvas canvas) {

        int xPrev = -1, yPrev = -1, xNow = -1, yNow = -1;

        Paint paint = new Paint();

        paint.setColor(Color.BLUE);

        paint.setStyle(Paint.Style.FILL_AND_STROKE);

        paint.setStrokeWidth(4);

    paint.setAlpha(100);

        if (all_geo_points != null)

            for (int i = 0; i < all_geo_points.size() - 4; i++) {

                GeoPoint gp = (GeoPoint) all_geo_points.get(i);

                Point point = new Point();

                mv.getProjection().toPixels(gp, point);

                xNow = point.x;

                yNow = point.y;

                if (xPrev != -1) {

                    canvas.drawLine(xPrev, yPrev, xNow, yNow, paint);

               }

                xPrev = xNow;

                yPrev = yNow;

            }

    }

}

}

これはコードです グーグルマップについてはラインドライブなので、ドライバーへのウェイラインのポイント緯度と経度の2つのポイントを入力し、入力は配列です。コードではエラーは発生しませんが、コードには配列 8 に関する警告があり、配列に関するすべての警告が表示されます。プログラムを実行すると、配列インデックスに関するエラー logcat が発生します。

01-18 00:37:29.720: E/AndroidRuntime(667): 致命的な例外: メイン 01-18 00:37:29.720: E/AndroidRuntime(667): java.lang.RuntimeException: アクティビティ ComponentInfo{com を開始できません。 example.getgoogledirection/com.example.getgoogledirection.MainActivity}: java.lang.IndexOutOfBoundsException: 無効なインデックス 0、サイズは 0 01-18 00:37:29.720: E/AndroidRuntime(667): android.app.ActivityThread.performLaunchActivity で(ActivityThread.java:2059) 01-18 00:37:29.720: E/AndroidRuntime(667): android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 01-18 00:37:29.720: E/AndroidRuntime (667): android.app.ActivityThread.access$600(ActivityThread.java:130) 01-18 00:37:29.720: E/AndroidRuntime(667): android.app.ActivityThread$H.handleMessage(ActivityThread.java で:1195) 01-18 00:37:29.720: E/AndroidRuntime(667): android.os.Handler で。dispatchMessage(Handler.java:99) 01-18 00:37:29.720: E/AndroidRuntime(667): android.os.Looper.loop(Looper.java:137) 01-18 00:37:29.720: E/ AndroidRuntime(667): android.app.ActivityThread.main(ActivityThread.java:4745) 01-18 00:37:29.720: E/AndroidRuntime(667): java.lang.reflect.Method.invokeNative(ネイティブ メソッド) で01-18 00:37:29.720: E/AndroidRuntime(667): java.lang.reflect.Method.invoke(Method.java:511) 01-18 00:37:29.720: E/AndroidRuntime(667): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 01-18 00:37:29.720: E/AndroidRuntime(667): com.android.internal.os.ZygoteInit.main(ZygoteInit) で.java:553) 01-18 00:37:29.720: E/AndroidRuntime(667): dalvik.system.NativeStart.main(ネイティブ メソッド) 01-18 00:37:29.720: E/AndroidRuntime(667): 原因by: java.lang.IndexOutOfBoundsException: 無効なインデックス 0、サイズは0ですjava.util.ArrayList.get(ArrayList.java:304) 01-18 00:37:29.720: E/AndroidRuntime(667): com.example.getgoogledirection.MainActivity.onCreate(MainActivity.java:45) 01- 18 00:37:29.720: E/AndroidRuntime(667): android.app.Activity.performCreate(Activity.java:5008) 01-18 00:37:29.720: E/AndroidRuntime(667): android.app. Instrumentation.callActivityOnCreate(Instrumentation.java:1079) 01-18 00:37:29.720: E/AndroidRuntime(667): android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) でjava.util.ArrayList.get(ArrayList.java:304) 01-18 00:37:29.720: E/AndroidRuntime(667): com.example.getgoogledirection.MainActivity.onCreate(MainActivity.java:45) 01- 18 00:37:29.720: E/AndroidRuntime(667): android.app.Activity.performCreate(Activity.java:5008) 01-18 00:37:29.720: E/AndroidRuntime(667): android.app. Instrumentation.callActivityOnCreate(Instrumentation.java:1079) 01-18 00:37:29.720: E/AndroidRuntime(667): android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) でjava.util.ArrayList.get(ArrayList.java:304) 01-18 00:37:29.720: E/AndroidRuntime(667): com.example.getgoogledirection.MainActivity.onCreate(MainActivity.java:45) 01- 18 00:37:29.720: E/AndroidRuntime(667): android.app.Activity.performCreate(Activity.java:5008) 01-18 00:37:29.720: E/AndroidRuntime(667): android.app. Instrumentation.callActivityOnCreate(Instrumentation.java:1079) 01-18 00:37:29.720: E/AndroidRuntime(667): android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) でcallActivityOnCreate(Instrumentation.java:1079) 01-18 00:37:29.720: E/AndroidRuntime(667): android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) でcallActivityOnCreate(Instrumentation.java:1079) 01-18 00:37:29.720: E/AndroidRuntime(667): android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) で

4

1 に答える 1

0

logcat の出力をここに置くと、はるかに簡単に支援できます。あなたが言及したように、エラーはおそらく getDirections メソッドから発生します。

于 2013-01-17T17:27:01.297 に答える