Parsing sunrise and sunset values from web service

Question

Okay, so it appears I'm stuck and could do with some help.

After successfully calling this webservice with my current longitude and latitude I am getting the entire xml file back in response.

However the only bit of the xml file I want is the sunrise and sunset times, how do I go about parsing these and only these into TextViews?

I've looked at and attempted countless tutorials on XmlPullParser, DOMParser and SAXParser and I'm now struggling.

Code as requested:

import java.io.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.protocol.HttpContext;
import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class SunriseSunset extends Activity implements OnClickListener {

    public Button getLocation;
    public TextView LongCoord;
    public TextView LatCoord;
    public double longitude;
    public double latitude;
    public LocationManager lm;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.sunrisesunset);
        findViewById(R.id.my_button).setOnClickListener(this);
        lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

        lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 1,
                new MyLocationListener());

        getLocation = (Button) findViewById(R.id.GetLocation);
        LongCoord = (TextView) findViewById(R.id.LongCoord);
        LatCoord = (TextView) findViewById(R.id.LatCoord);

        getLocation.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // When GetLocation button is clicked the showCurrentLocation
                // function is ran
                showCurrentLocation();
            }

        });
    }

    protected void showCurrentLocation() {
        // TODO Auto-generated method stub
        // This is called to find current location based on GPS data and sends
        // this to LongCoord and LatCoord TextViewsw
        Location location = lm
                .getLastKnownLocation(LocationManager.GPS_PROVIDER);
        latitude = location.getLatitude();
        longitude = location.getLongitude();

        LongCoord.setText(Double.toString(longitude));
        LatCoord.setText(Double.toString(latitude));
    }

    @Override
    public void onClick(View arg0) {
        Button b = (Button) findViewById(R.id.my_button);
        b.setClickable(false);
        new LongRunningGetIO().execute();
    }

    private class LongRunningGetIO extends AsyncTask<Void, Void, String> {

        protected String getASCIIContentFromEntity(HttpEntity entity)
                throws IllegalStateException, IOException {
            InputStream in = entity.getContent();
            StringBuffer out = new StringBuffer();
            int n = 1;
            while (n > 0) {
                byte[] b = new byte[4096];
                n = in.read(b);
                if (n > 0)
                    out.append(new String(b, 0, n));
            }
            return out.toString();
        }

        @Override
        protected String doInBackground(Void... params) {
            HttpClient httpClient = new DefaultHttpClient();
            HttpContext localContext = new BasicHttpContext();
            //Finds todays date and adds that into the URL
            Calendar c = Calendar.getInstance();
            System.out.println("Current time => " + c.getTime());
            SimpleDateFormat df = new SimpleDateFormat("dd/MM");
            String formattedDate = df.format(c.getTime());

            String finalURL = "http://www.earthtools.org/sun/"
                    + LatCoord.getText().toString().trim() + "/"
                    + LongCoord.getText().toString().trim() + "/"
                    + formattedDate + "/99/0";
            HttpGet httpGet = new HttpGet(finalURL);
            String text = null;

            try {
                HttpResponse response = httpClient.execute(httpGet,
                        localContext);
                HttpEntity entity = response.getEntity();
                text = getASCIIContentFromEntity(entity);
            } catch (Exception e) {
                return e.getLocalizedMessage();
            }
            return text;
        }

        protected void onPostExecute(String results) {
            if (results != null) {
                EditText et = (EditText) findViewById(R.id.my_edit);
                et.setText(results);
            }
            Button b = (Button) findViewById(R.id.my_button);
            b.setClickable(true);
        }
    }

    class MyLocationListener implements LocationListener {
        @Override
        public void onLocationChanged(Location location) {
            // TODO Auto-generated method stub
        }

        @Override
        public void onProviderDisabled(String provider) {
            // TODO Auto-generated method stub
        }

        @Override
        public void onProviderEnabled(String provider) {
            // TODO Auto-generated method stub
        }

        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {
            // TODO Auto-generated method stub
        }
    }
}

And here is the layout being used:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".SunriseSunset" >

    <LinearLayout
        android:id="@+id/LinearLayout02"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true" >

        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Date:"
            android:textAppearance="?android:attr/textAppearanceMedium" />

       <TextView
            android:id="@+id/Date"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Today"
            android:textAppearance="?android:attr/textAppearanceMedium" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/LinearLayout02"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true" >

        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Location:"
            android:textAppearance="?android:attr/textAppearanceMedium" />

        <TextView
            android:id="@+id/Date"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Current Location"
            android:textAppearance="?android:attr/textAppearanceMedium" />

    </LinearLayout>

    <Button
        android:id="@+id/GetLocation"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="Find Location" />

    <TextView
        android:id="@+id/LatCoord"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

    <TextView
        android:id="@+id/LongCoord"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

     <Button 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="Calculate Sunrise/Sunset Time"
        android:id="@+id/my_button"/>
    <EditText 
        android:layout_margin="20dip"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:minLines="30"
        android:maxLines="30"
        android:textSize="12sp"
        android:editable="false"
        android:id="@+id/my_edit"/>

</LinearLayout>

Thanks in advance for your help!

Answer 1

You can try replacing your onPostExecute with the one below and add this import...

import java.io.StringReader;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;


protected void onPostExecute(String results) {
        if (results != null) {
        try {

            DocumentBuilderFactory dbFactory = DocumentBuilderFactory
                    .newInstance();
            DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
            InputSource s = new InputSource(new StringReader(result));
            Document doc = dBuilder.parse(s);
            doc.getDocumentElement().normalize();
                            //EditText et = (EditText) findViewById(R.id.my_edit);
                            TextView tv = (TextView) findViewById(R.id.Date);
                            tv.setText("sunrise at "+doc.getElementsByTagName("sunrise").item(0).getTextContent() + " sunset at "+doc.getElementsByTagName("sunset").item(0).getTextContent());
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    Button b = (Button) findViewById(R.id.my_button);
    b.setClickable(true);
    }

EDIT: I'm not sure which TextView you want to set but I guess this one (R.id.Date). You can change the id if it's not the right one.

//EditText et = (EditText) findViewById(R.id.my_edit); 
TextView tv = (TextView) findViewById(R.id.Date);
tv.setText...