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POHow to implement an api call in a java class in an Android project?
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  1. POHow to implement an api call in a java class in an Android project?
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    copied!<p>In my Android project I call Google api for getting a xml to get directions between two points. I have a class named Getdirections.java in which I create an instance of GMapV2Direction.java class. In GMapV2Direction.java, I call the Google api and parse the xml. In devices below android 2.3, its working fine but in android 4, its getting NetworkOnManinThreadException. Here is My GMapV2Direction.java file. </p> <pre><code>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.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 + "&amp;destination=" + end.latitude + "," + end.longitude + "&amp;sensor=false&amp;units=metric&amp;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&lt;LatLng&gt; getDirection (Document doc) { NodeList nl1, nl2, nl3; ArrayList&lt;LatLng&gt; listGeopoints = new ArrayList&lt;LatLng&gt;(); nl1 = doc.getElementsByTagName("step"); if (nl1.getLength() &gt; 0) { for (int i = 0; i &lt; 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&lt;LatLng&gt; arr = decodePoly(latNode.getTextContent()); for(int j = 0 ; j &lt; 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 &lt; nl.getLength() ; i++) { if(nl.item(i).getNodeName().equals(nodename)) return i; } return -1; } private ArrayList&lt;LatLng&gt; decodePoly(String encoded) { ArrayList&lt;LatLng&gt; poly = new ArrayList&lt;LatLng&gt;(); int index = 0, len = encoded.length(); int lat = 0, lng = 0; while (index &lt; len) { int b, shift = 0, result = 0; do { b = encoded.charAt(index++) - 63; result |= (b &amp; 0x1f) &lt;&lt; shift; shift += 5; } while (b &gt;= 0x20); int dlat = ((result &amp; 1) != 0 ? ~(result &gt;&gt; 1) : (result &gt;&gt; 1)); lat += dlat; shift = 0; result = 0; do { b = encoded.charAt(index++) - 63; result |= (b &amp; 0x1f) &lt;&lt; shift; shift += 5; } while (b &gt;= 0x20); int dlng = ((result &amp; 1) != 0 ? ~(result &gt;&gt; 1) : (result &gt;&gt; 1)); lng += dlng; LatLng position = new LatLng((double) lat / 1E5, (double) lng / 1E5); poly.add(position); } return poly; } </code></pre> <p>}</p> <p>This is my Getdirection.java file from where i instantiate GMapV2Direction.java.</p> <pre><code>public class GetDirectionsActivity extends FragmentActivity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.getdirections); .... .... .... Document doc = md.getDocument(userLocation, toPosition, GMapV2Direction.MODE_DRIVING); ArrayList&lt;LatLng&gt; directionPoint = md.getDirection(doc); PolylineOptions rectLine = new PolylineOptions().width(3).color( Color.RED); for (int i = 0; i &lt; directionPoint.size(); i++) { rectLine.add(directionPoint.get(i)); } map.addPolyline(rectLine); .... .... .... } } </code></pre> <p>Kindly give a suggestion so that I can handle this exception. Any edit in my file is welcome!</p>
 

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