Android中的Earthquake(地震顯示器) 項目 詳解

環境: Android Studio 0.5.2, Gradle 1.11, kindle fire

時間: 2014-3-24

修正位置資訊異常: http://blog.csdn.net/caroline_wendy/article/details/24465487

Earthquake項目, 主要是讀取USGS(United States Geological Survey, 美國地址勘探局)提供的feeds(訂閱源), 進行顯示資料;

需要讀取互連網的資料, 進行格式解析(parse), 資料類型是atom類型, 類似XML.

訂閱源地址: http://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/2.5_day.atom

格式:

<feed xmlns="http://www.w3.org/2005/Atom" xmlns:georss="http://www.georss.org/georss">  <title>USGS Magnitude 2.5+ Earthquakes, Past Day</title>  <updated>2014-03-24T07:56:39Z</updated>  <author>  <name>U.S. Geological Survey</name>  <uri>http://earthquake.usgs.gov/</uri>  </author>  <id>  http://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/2.5_day.atom  </id>  <link rel="self" href="http://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/2.5_day.atom" />  <icon>http://earthquake.usgs.gov/favicon.ico</icon>  <entry>  <id>urn:earthquake-usgs-gov:ci:15479569</id>  <title>M 2.9 - 9km W of Alberto Oviedo Mota, Mexico</title>  <updated>2014-03-24T07:48:34.609Z</updated>  <link rel="alternate" type="text/html" href="http://earthquake.usgs.gov/earthquakes/eventpage/ci15479569" />  <summary type="html">  <![CDATA[ <p class="quicksummary"><a href="http://earthquake.usgs.gov/earthquakes/eventpage/ci15479569#dyfi" class="mmi-I" title="Did You Feel It? maximum reported intensity (0 reports)">DYFI? - <strong class="roman">I</strong></a></p><dl><dt>Time</dt><dd>2014-03-24 07:38:10 UTC</dd><dd>2014-03-23 23:38:10 -08:00 at epicenter</dd><dt>Location</dt><dd>32.222°N 115.274°W</dd><dt>Depth</dt><dd>14.10 km (8.76 mi)</dd></dl> ]]></summary>  <georss:point>32.2215 -115.274</georss:point>  <georss:elev>-14100</georss:elev>  <category label="Age" term="Past Hour" />  <category label="Magnitude" term="Magnitude 2" />  </entry>  ......  ......

Earthquake的具體設計:

建立項目: Earthquake

1. 建立Quake(Quake.java)類, 顯示地震資料.

位置: java->package->Quake

package mzx.spike.earthquake.app;        import android.location.Location;        import java.text.SimpleDateFormat;  import java.util.Date;        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;          details = _det;          location = _loc;          magnitude = _mag;          link = _link;      }            @Override    public String toString() {          SimpleDateFormat sdf = new SimpleDateFormat("HH.mm");          String dateString = sdf.format(date);          return dateString + ": " + magnitude + " " + details;      }        }

詳解:

1. 顯示的類型: date, 日期; details, 詳細資料, 地點; location, 位置; magnitude, 震級; link, 連結;

2. get()方法, 返回資訊; 建構函式, 賦初值; toString(), 預設輸出資訊;

2. 修改activity_main.xml, 添加fragment.

位置: res->layout->activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    android:paddingBottom="@dimen/activity_vertical_margin"    tools:context="mzx.spike.earthquake.app.MainActivity">            <fragment android:name="mzx.spike.earthquake.app.EarthquakeListFragment"        android:id="@+id/EarthquakeListFragment"        android:layout_width="match_parent"        android:layout_height="match_parent"     />  </RelativeLayout>

添加Fragment, 指定實現(.java)檔案位置.