<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"/>

<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> 

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 != '\t' && c != '\r' && c != '\n' )

            {

                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;

    }

}