Android之开源中国客户端源码分析（二）

1、 加载动画圈实现

<ProgressBar 
        android:id="@+id/main_head_progress" 
        style="@style/loading_small"
        android:layout_toRightOf="@id/main_head_title"
        android:layout_centerVertical="true"
        android:layout_marginLeft="5.0dip"
        android:visibility="gone"/>

@style/loading_small

<item name="android:indeterminateDrawable">@anim/loading</item>

@anim/loading

<?xml version="1.0" encoding="UTF-8"?>
<animation-list android:oneshot="false"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:duration="100" android:drawable="@drawable/loading_0" />
    <item android:duration="100" android:drawable="@drawable/loading_1" />
    <item android:duration="100" android:drawable="@drawable/loading_2" />
    <item android:duration="100" android:drawable="@drawable/loading_3" />
    <item android:duration="100" android:drawable="@drawable/loading_4" />
    <item android:duration="100" android:drawable="@drawable/loading_5" />
    <item android:duration="100" android:drawable="@drawable/loading_6" />
    <item android:duration="100" android:drawable="@drawable/loading_7" />
</animation-list> 

显示：Progress.setVisibility(ProgressBar.VISIBLE);

消失：Progress.setVisibility(ProgressBar.GONE);

工具类StringUtil：

public class StringUtils 
{
    private final static Pattern emailer = Pattern.compile("\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*");
    //private final static SimpleDateFormat dateFormater = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    //private final static SimpleDateFormat dateFormater2 = new SimpleDateFormat("yyyy-MM-dd");
    
    private final static ThreadLocal<SimpleDateFormat> dateFormater = new ThreadLocal<SimpleDateFormat>() {
        @Override
        protected SimpleDateFormat initialValue() {
            return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        }
    };

    private final static ThreadLocal<SimpleDateFormat> dateFormater2 = new ThreadLocal<SimpleDateFormat>() {
        @Override
        protected SimpleDateFormat initialValue() {
            return new SimpleDateFormat("yyyy-MM-dd");
        }
    };
    
    /**
     * 将字符串转位日期类型
     * @param sdate  sdate的样式：2013-09-23 17:10:35

     * @return
     */
    public static Date toDate(String sdate) {
        try {
            return dateFormater.get().parse(sdate);
        } catch (ParseException e) {
            return null;
        }
    }
    
    /**
     * 以友好的方式显示时间
     * @param sdate
     * @return
     */
    public static String friendly_time(String sdate) {
        Date time = toDate(sdate);
        if(time == null) {
            return "Unknown";
        }
        String ftime = "";
        Calendar cal = Calendar.getInstance();
        
        //判断是否是同一天
        String curDate = dateFormater2.get().format(cal.getTime());
        String paramDate = dateFormater2.get().format(time);
        if(curDate.equals(paramDate)){
            int hour = (int)((cal.getTimeInMillis() - time.getTime())/3600000);
            if(hour == 0)
                ftime = Math.max((cal.getTimeInMillis() - time.getTime()) / 60000,1)+"分钟前";
            else 
                ftime = hour+"小时前";
            return ftime;
        }
        
        long lt = time.getTime()/86400000;
        long ct = cal.getTimeInMillis()/86400000;
        int days = (int)(ct - lt);        
        if(days == 0){
            int hour = (int)((cal.getTimeInMillis() - time.getTime())/3600000);
            if(hour == 0)
                ftime = Math.max((cal.getTimeInMillis() - time.getTime()) / 60000,1)+"分钟前";
            else 
                ftime = hour+"小时前";
        }
        else if(days == 1){
            ftime = "昨天";
        }
        else if(days == 2){
            ftime = "前天";
        }
        else if(days > 2 && days <= 10){ 
            ftime = days+"天前";            
        }
        else if(days > 10){            
            ftime = dateFormater2.get().format(time);
        }
        return ftime;
    }
    
    /**
     * 判断给定字符串时间是否为今日
     * @param sdate
     * @return boolean
     */
    public static boolean isToday(String sdate){
        boolean b = false;
        Date time = toDate(sdate);
        Date today = new Date();
        if(time != null){
            String nowDate = dateFormater2.get().format(today);
            String timeDate = dateFormater2.get().format(time);
            if(nowDate.equals(timeDate)){
                b = true;
            }
        }
        return b;
    }
    
    /**
     * 判断给定字符串是否空白串。
     * 空白串是指由空格、制表符、回车符、换行符组成的字符串
     * 若输入字符串为null或空字符串，返回true
     * @param input
     * @return boolean
     */
    public static boolean isEmpty( String input ) 
    {
        if ( input == null || "".equals( input ) )
            return true;
        
        for ( int i = 0; i < input.length(); i++ ) 
        {
            char c = input.charAt( i );
            if ( c != ' ' && c != '	' && c != '
' && c != '
' )
            {
                return false;
            }
        }
        return true;
    }

    /**
     * 判断是不是一个合法的电子邮件地址
     * @param email
     * @return
     */
    public static boolean isEmail(String email){
        if(email == null || email.trim().length()==0) 
            return false;
        return emailer.matcher(email).matches();
    }
    /**
     * 字符串转整数
     * @param str
     * @param defValue
     * @return
     */
    public static int toInt(String str, int defValue) {
        try{
            return Integer.parseInt(str);
        }catch(Exception e){}
        return defValue;
    }
    /**
     * 对象转整数
     * @param obj
     * @return 转换异常返回 0
     */
    public static int toInt(Object obj) {
        if(obj==null) return 0;
        return toInt(obj.toString(),0);
    }
    /**
     * 对象转整数
     * @param obj
     * @return 转换异常返回 0
     */
    public static long toLong(String obj) {
        try{
            return Long.parseLong(obj);
        }catch(Exception e){}
        return 0;
    }
    /**
     * 字符串转布尔值
     * @param b
     * @return 转换异常返回 false
     */
    public static boolean toBool(String b) {
        try{
            return Boolean.parseBoolean(b);
        }catch(Exception e){}
        return false;
    }
}