Android中的Earthquake(地震显示器) 项目 详解

环境: Android Studio 0.5.2, Gradle 1.11, kindle fire

时间: 2014-3-24

修正位置信息异常: http://blog.csdn.net/caroline_wendy/article/details/24465487

Earthquake项目, 主要是读取USGS(United States Geological Survey, 美国地址勘探局)提供的feeds(订阅源), 进行显示数据;

需要读取互联网的数据, 进行格式解析(parse), 数据类型是atom类型, 类似XML.

订阅源地址: 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的具体设计:

新建项目: Earthquake

1. 新建Quake(Quake.java)类, 显示地震数据.

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;
    }  

}

详解:

1. 显示的类型: date, 日期; details, 详细信息, 地点; location, 位置; magnitude, 震级; link, 链接;

2. get()方法, 返回信息; 构造函数, 赋初值; toString(), 默认输出信息;

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, 指定实现(.java)文件位置.

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