Android™ Application Development - Bahar Ali Khan

Chapter 5: Intents, Broadcast Receivers, Adapters, and the Internet
Creating an Earthquake Viewer
148
In the following example, you’ll create a tool that uses a USGS earthquake feed to display a list of recent
earthquakes.
You will return to this Earthquake application several times, fi rst in Chapter 6 to save and share the
earthquake data with a Content Provider, and again in Chapters 7 and 8 to add mapping support and to
move the earthquake updates into a background Service.
In this example, you will create a list-based Activity that connects to an earthquake feed and displays
the location, magnitude, and time of the earthquakes it contains. You’ll use an Alert Dialog to provide a
detail window that includes a linkifi ed Text View with a link to the USGS web site.
1. Start by creating an Earthquake project featuring an Earthquake Activity. Modify the main.xml
layout resource to include a List View control — be sure to name it so you can reference it from
the Activity code.
2. Create a new public Quake class. This class will be used to store the details (date, details, location,
magnitude, and link) of each earthquake. Override the toString method to provide the
string that will be used for each quake in the List View.
package com.paad.earthquake;
import java.util.Date;
import java.text.SimpleDateFormat;
import android.location.Location;
public class Quake {
private Date date;
private String details;
private Location location;
private double magnitude;
private String link;
public Date getDate() { return date; }
public String getDetails() { return details; }
public Location getLocation() { return location; }
public double getMagnitude() { return magnitude; }
public String getLink() { return link; }
public Quake(Date _d, String _det, Location _loc, double _mag,
String _link) {
date = _d;