IndexOutOfBoundsException showing while running my android program

Issue

I am doing an Android map oriented project. I wrote some code to display the direction between two places, but it only works in lower android versions such as 2.0, 2.2, etc. It is not working on Android 4.0 and higher. When I run this code in Android 4.0 it shows an IndexOutOfBoundsException.

My class

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.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;
import android.os.Bundle;
import android.widget.Button;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;

public class LocationActivity extends MapActivity {
        MapView mv;

        MapController mc;

        Button Save, Cancel;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.map_places);
                MapView mv = (MapView)findViewById(R.id.mapView);
                mv.setBuiltInZoomControls(true);
                MapController mc = mv.getController();
                ArrayList<GeoPoint> all_geo_points = getDirections(10.154929, 76.390316, 10.015861, 76.341867);
                GeoPoint moveTo = all_geo_points.get(0);
                mc.animateTo(moveTo);
                mc.setZoom(12);
                mv.getOverlays().add(new MyOverlay(all_geo_points));
        }

        public class MyOverlay extends Overlay {
                private ArrayList<GeoPoint> all_geo_points;

                public MyOverlay(ArrayList<GeoPoint> 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 = 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;
                        }
                }
        }

        public static ArrayList<GeoPoint> 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<GeoPoint> list_of_geopoints = new ArrayList<GeoPoint>();
                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<GeoPoint>();
                                        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;
        }

        @Override
        protected boolean isRouteDisplayed() {
                // TODO Auto-generated method stub
                return true;
        }
}

My logcat

03-01 19:05:19.180: E/AndroidRuntime(2839): FATAL EXCEPTION: main
03-01 19:05:19.180: E/AndroidRuntime(2839): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.kodspider.parkon/com.kodspider.parkon.LocationActivity}: java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
03-01 19:05:19.180: E/AndroidRuntime(2839):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
03-01 19:05:19.180: E/AndroidRuntime(2839):     at android.app.ActivityThread.startActivityNow(ActivityThread.java:1900)
03-01 19:05:19.180: E/AndroidRuntime(2839):     at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:135)
03-01 19:05:19.180: E/AndroidRuntime(2839):     at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:347)
03-01 19:05:19.180: E/AndroidRuntime(2839):     at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:694)
03-01 19:05:19.180: E/AndroidRuntime(2839):     at android.widget.TabHost.setCurrentTab(TabHost.java:358)
03-01 19:05:19.180: E/AndroidRuntime(2839):     at android.widget.TabHost$2.onTabSelectionChanged(TabHost.java:150)
03-01 19:05:19.180: E/AndroidRuntime(2839):     at android.widget.TabWidget$TabClickListener.onClick(TabWidget.java:546)
03-01 19:05:19.180: E/AndroidRuntime(2839):     at android.view.View.performClick(View.java:4084)
03-01 19:05:19.180: E/AndroidRuntime(2839):     at android.view.View$PerformClick.run(View.java:16966)
03-01 19:05:19.180: E/AndroidRuntime(2839):     at android.os.Handler.handleCallback(Handler.java:615)
03-01 19:05:19.180: E/AndroidRuntime(2839):     at android.os.Handler.dispatchMessage(Handler.java:92)
03-01 19:05:19.180: E/AndroidRuntime(2839):     at android.os.Looper.loop(Looper.java:137)
03-01 19:05:19.180: E/AndroidRuntime(2839):     at android.app.ActivityThread.main(ActivityThread.java:4745)
03-01 19:05:19.180: E/AndroidRuntime(2839):     at java.lang.reflect.Method.invokeNative(Native Method)
03-01 19:05:19.180: E/AndroidRuntime(2839):     at java.lang.reflect.Method.invoke(Method.java:511)
03-01 19:05:19.180: E/AndroidRuntime(2839):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
03-01 19:05:19.180: E/AndroidRuntime(2839):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
03-01 19:05:19.180: E/AndroidRuntime(2839):     at dalvik.system.NativeStart.main(Native Method)
03-01 19:05:19.180: E/AndroidRuntime(2839): Caused by: java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
03-01 19:05:19.180: E/AndroidRuntime(2839):     at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:251)
03-01 19:05:19.180: E/AndroidRuntime(2839):     at java.util.ArrayList.get(ArrayList.java:304)
03-01 19:05:19.180: E/AndroidRuntime(2839):     at com.kodspider.parkon.LocationActivity.onCreate(LocationActivity.java:43)
03-01 19:05:19.180: E/AndroidRuntime(2839):     at android.app.Activity.performCreate(Activity.java:5008)
03-01 19:05:19.180: E/AndroidRuntime(2839):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
03-01 19:05:19.180: E/AndroidRuntime(2839):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
03-01 19:05:19.180: E/AndroidRuntime(2839):     ... 18 more

Solution

I found the answer for my question for higher version of android platforms we must use an AsyncTask class for the background thread

Answered By - Hybrid Developer