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SoftInputUtil软键盘隐藏or显示

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public class SoftInputUtil {
    /**
     * 显示软键盘
     *
     * @param context
     */
    public static void showSoftInput(Context context) {
        InputMethodManager imm = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.toggleSoftInput(0, InputMethodManager.HIDE_NOT_ALWAYS);
    }

    /**
     * 显示软键盘
     *
     * @param context
     * @param view
     */
    public static void showSoftInput(Context context, View view) {
        InputMethodManager imm = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.showSoftInput(view, 0);
    }

    /**
     * 隐藏软键盘
     *
     * @param context
     * @param view
     */
    public static void hideSoftInput(Context context, View view) {
        InputMethodManager imm = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
    }
}

键盘相关代码

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CommonAdapter：listview、gridview

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import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.util.SparseArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.List;

public abstract class CommonAdapter<T> extends BaseAdapter {
    protected LayoutInflater mInflater;
    protected Context mContext;
    protected List<T> mDatas;
    protected final int mItemLayoutId;

    public CommonAdapter(Context context, List<T> mDatas, int mItemLayoutId) {
        this.mContext = context;
        this.mInflater = LayoutInflater.from(mContext);
        this.mDatas = mDatas;
        this.mItemLayoutId = mItemLayoutId;
    }

    @Override
    public int getCount() {
        return mDatas.size();
    }

    @Override
    public T getItem(int position) {
        return mDatas.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        final ViewHolder viewHolder = getViewHolder(position, convertView, parent);
        convert(viewHolder, getItem(position));
        return viewHolder.getConvertView();
    }

    protected abstract void convert(ViewHolder viewHolder, T item);

    private ViewHolder getViewHolder(int position, View convertView, ViewGroup parent) {
        return ViewHolder.get(mContext, convertView, parent, mItemLayoutId, position);
    }
}
public class ViewHolder {
    private SparseArray<View> mViews;
    private View mConvertView;
    private int mPosition;
    private Context mContext;

    private ViewHolder(Context context, ViewGroup parent, int layoutId, int position) {
        this.mViews = new SparseArray<View>();
        mPosition = position;
        mContext = context;
        mConvertView = LayoutInflater.from(context).inflate(layoutId, parent, false);
        //setTag
        mConvertView.setTag(this);
    }

    /**
     * 拿到一个ViewHolder对象
     *
     * @param context
     * @param convertView
     * @param parent
     * @param layoutId
     * @param postion
     * @return
     */
    public static ViewHolder get(Context context, View convertView, ViewGroup parent, int layoutId, int postion) {
        if (convertView == null) {
            return new ViewHolder(context, parent, layoutId, postion);
        }
        return (ViewHolder) convertView.getTag();
    }

    /**
     * 通过控件的Id获取对应的控件，如果没有则加入views
     *
     * @param viewId
     * @param <T>
     * @return
     */
    public <T extends View> T getView(int viewId) {
        View view = mViews.get(viewId);
        if (view == null) {
            view = mConvertView.findViewById(viewId);
            mViews.put(viewId, view);
        }
        return (T) view;
    }

    public View getConvertView() {
        return mConvertView;
    }

    /**
     * 为TextView 设置字符串
     *
     * @param viewId
     * @param text
     * @return
     */
    public ViewHolder setText(int viewId, String text) {
        TextView view = getView(viewId);
        view.setText(text);
        view.setTextColor(Color.BLACK);
        return this;
    }

    /**
     * 为ImageView 设置图片
     *
     * @param viewId
     * @param drawableId
     * @return
     */
    public ViewHolder setImageResource(int viewId, int drawableId) {
        ImageView view = getView(viewId);
        view.setImageResource(drawableId);
        return this;
    }

    /**
     * 为ImageView 设置图片
     *
     * @param viewId
     * @param bm
     * @return
     */
    public ViewHolder setImageBitmap(int viewId, Bitmap bm) {
        ImageView view = getView(viewId);
        view.setImageBitmap(bm);
        return this;
    }

    /**
     * 为ImageView 设置图片
     *
     * @param viewId
     * @param url
     * @return
     */
    public ViewHolder setImageByUrl(int viewId, String url) {
        //        ImageDownLoad.getDownLoadSmallImg(url, (ImageView) getView(viewId));
        PicassoUtils.getinstance().loadImageByPath(mContext, url, (ImageView) getView(viewId), PicassoUtils.PICASSO_BITMAP_SHOW_NORMAL_TYPE, -1);
        return this;
    }

    public int getPosition() {
        return mPosition;
    }
}

调用

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利用正则表达式校验邮箱、手机号等

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/**
 * 校验器：利用正则表达式校验邮箱、手机号等
 * Created by shenbinghong on 2018/1/6.
 */

public class Validator {
    /**
     * 正则表达式：验证用户名
     */
    public static final String REGEX_USERNAME = "^[a-zA-Z]\\w{5,20}$";

    /**
     * 正则表达式：验证密码
     */
    public static final String REGEX_PASSWORD = "^[a-zA-Z0-9]{6,20}$";

    /**
     * 正则表达式：验证手机号
     */
    public static final String REGEX_MOBILE = "^((17[0-9])|(14[0-9])|(13[0-9])|(15[0-9])|(18[0-9]))\\d{8}$";

    /**
     * 正则表达式：验证邮箱
     */
    public static final String REGEX_EMAIL = "^([a-z0-9A-Z]+[-|\\.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?\\.)+[a-zA-Z]{2,}$";

    /**
     * 正则表达式：验证汉字
     */
    public static final String REGEX_CHINESE = "^[\u4e00-\u9fa5],{0,}$";

    /**
     * 正则表达式：验证身份证
     */
    public static final String REGEX_ID_CARD = "(^\\d{18}$)|(^\\d{15}$)";

    /**
     * 正则表达式：验证URL
     */
    public static final String REGEX_URL = "http(s)?://([\\w-]+\\.)+[\\w-]+(/[\\w- ./?%&=]*)?";

    /**
     * 正则表达式：验证IP地址
     */
    public static final String REGEX_IP_ADDR = "(25[0-5]|2[0-4]\\d|[0-1]\\d{2}|[1-9]?\\d)";

    /**
     * 校验用户名
     *
     * @param username
     * @return 校验通过返回true，否则返回false
     */
    public static boolean isUsername(String username) {
        return Pattern.matches(REGEX_USERNAME, username);
    }

    /**
     * 校验密码
     *
     * @param password
     * @return 校验通过返回true，否则返回false
     */
    public static boolean isPassword(String password) {
        return Pattern.matches(REGEX_PASSWORD, password);
    }

    /**
     * 校验手机号
     *
     * @param mobile
     * @return 校验通过返回true，否则返回false
     */
    public static boolean isMobile(String mobile) {
        return Pattern.matches(REGEX_MOBILE, mobile);
    }

    /**
     * 校验邮箱
     *
     * @param email
     * @return 校验通过返回true，否则返回false
     */
    public static boolean isEmail(String email) {
        return Pattern.matches(REGEX_EMAIL, email);
    }

    /**
     * 校验汉字
     *
     * @param chinese
     * @return 校验通过返回true，否则返回false
     */
    public static boolean isChinese(String chinese) {
        return Pattern.matches(REGEX_CHINESE, chinese);
    }

    /**
     * 校验身份证
     *
     * @param idCard
     * @return 校验通过返回true，否则返回false
     */
    public static boolean isIDCard(String idCard) {
        return Pattern.matches(REGEX_ID_CARD, idCard);
    }

    /**
     * 校验URL
     *
     * @param url
     * @return 校验通过返回true，否则返回false
     */
    public static boolean isUrl(String url) {
        return Pattern.matches(REGEX_URL, url);
    }

    /**
     * 校验IP地址
     *
     * @param ipAddr
     * @return
     */
    public static boolean isIPAddr(String ipAddr) {
        return Pattern.matches(REGEX_IP_ADDR, ipAddr);
    }


    /**
     * 校验是否是中国身份证号
     *
     * @param sfzh
     * @return true验证通过 false不通过
     */
    public static boolean isChinaIDCard(String sfzh) {
        try {
            int flag = 1;
            // 如果长度不是15和18，则返回错误
            if (sfzh.length() != 18 && sfzh.length() != 15) {
                flag = flag * 0;
            }
            if (sfzh.length() == 18) {
                String start = sfzh.substring(0, 6);
                int year = Integer.parseInt(sfzh.substring(6, 10));
                int month = Integer.parseInt(sfzh.substring(10, 12));
                int day = Integer.parseInt(sfzh.substring(12, 14));
                int nowYear = (new Date()).getYear() + 1900;
                Log.v("sfzh year is ", year + "");
                Log.v("sfzh month is ", month + "");
                Log.v("sfzh day is ", day + "");
                Log.v("now year is ", nowYear + "");
                if (year < 1900 || year > nowYear) {
                    flag = flag * 0;
                }
                if (month < 1 || month > 12) {
                    flag = flag * 0;
                }
                if (day < 1 || day > 31) {
                    flag = flag * 0;
                }
                // 判断验证位
                String check = "";
                int a = Integer.parseInt(sfzh.substring(0, 1)) * 7 + Integer.parseInt(sfzh.substring(1, 2)) * 9 + Integer.parseInt(sfzh.substring(2, 3)) * 10 + Integer.parseInt(sfzh.substring(3, 4))
                        * 5 + Integer.parseInt(sfzh.substring(4, 5)) * 8 + Integer.parseInt(sfzh.substring(5, 6)) * 4 + Integer.parseInt(sfzh.substring(6, 7)) * 2
                        + Integer.parseInt(sfzh.substring(7, 8)) * 1 + Integer.parseInt(sfzh.substring(8, 9)) * 6 + Integer.parseInt(sfzh.substring(9, 10)) * 3
                        + Integer.parseInt(sfzh.substring(10, 11)) * 7 + Integer.parseInt(sfzh.substring(11, 12)) * 9 + Integer.parseInt(sfzh.substring(12, 13)) * 10
                        + Integer.parseInt(sfzh.substring(13, 14)) * 5 + Integer.parseInt(sfzh.substring(14, 15)) * 8 + Integer.parseInt(sfzh.substring(15, 16)) * 4
                        + Integer.parseInt(sfzh.substring(16, 17)) * 2;
                int b = a % 11;
                switch (b) {
                    case 0:
                        check = "1";
                        break;
                    case 1:
                        check = "0";
                        break;
                    case 2:
                        check = "X";
                        break;
                    case 3:
                        check = "9";
                        break;
                    case 4:
                        check = "8";
                        break;
                    case 5:
                        check = "7";
                        break;
                    case 6:
                        check = "6";
                        break;
                    case 7:
                        check = "5";
                        break;
                    case 8:
                        check = "4";
                        break;
                    case 9:
                        check = "3";
                        break;
                    case 10:
                        check = "2";
                        break;
                    default:
                        break;
                }
                Log.v("check num is ", check);
                if (!check.equals(sfzh.subSequence(17, 18))) {
                    flag = flag * 0;
                }
            }
            Log.v("flag", flag + "");
            if (flag == 1) {
                return true;
            } else {
                return false;
            }
        } catch (Exception ex) {
            ex.printStackTrace();
            return false;
        }
    }

    /**
     * 校验是否是身份证
     */
    public static boolean isPid(String str) {

        if (TextUtils.isEmpty(str)) {
            return false;
        }
        String[] arg = {str};

        // 17位加权因子，与身份证号前17位依次相乘。

        int w[] = {7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2};

        int sum = 0;// 保存级数和

        try {
            for (int i = 0; i < arg[0].length() - 1; i++) {
                sum += new Integer(arg[0].substring(i, i + 1)) * w[i];
            }
        } catch (Exception e) {
            return false;

        }

        /**
         * 校验结果，上一步计算得出的结果与11取模，得到的结果相对应的字符就是身份证最后一位 ，也就是校验位。例如：0对应下面数组第一个元素，
         * 以此类推。
         */

        String sums[] = {"1", "0", "X", "9", "8", "7", "6", "5", "4", "3", "2"};
        if (sums[(sum % 11)].equals(arg[0].substring(arg[0].length() - 1, arg[0].length()))) {// 与身份证最后一位比较
            return true;

        } else {
            return false;
        }

    }

    /**
     * 校验是否是银行卡卡号
     *
     * @param cardId
     * @return
     */
    public static boolean isBankCard(String cardId) {
        char bit = getBankCardCheckCode(cardId.substring(0, cardId.length() - 1));
        if (bit == 'N') {
            return false;
        }
        return cardId.charAt(cardId.length() - 1) == bit;
    }

    /**
     * 从不含校验位的银行卡卡号采用 Luhm 校验算法获得校验位
     *
     * @param nonCheckCodeCardId
     * @return
     */
    public static char getBankCardCheckCode(String nonCheckCodeCardId) {
        if (nonCheckCodeCardId == null || nonCheckCodeCardId.trim().length() == 0
                || !nonCheckCodeCardId.matches("\\d+")) {
            //如果传的不是数据返回N
            return 'N';
        }
        char[] chs = nonCheckCodeCardId.trim().toCharArray();
        int luhmSum = 0;
        for (int i = chs.length - 1, j = 0; i >= 0; i--, j++) {
            int k = chs[i] - '0';
            if (j % 2 == 0) {
                k *= 2;
                k = k / 10 + k % 10;
            }
            luhmSum += k;
        }
        return (luhmSum % 10 == 0) ? '0' : (char) ((10 - luhmSum % 10) + '0');
    }
}

检测服务是否在运行

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Posted on | In

Java汉字转换为拼音

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/**
 * Java汉字转换为拼音
 */
public class CharacterParser {
    private static int[] pyvalue = new int[]{-20319, -20317, -20304, -20295, -20292, -20283, -20265, -20257, -20242, -20230, -20051, -20036, -20032,
            -20026, -20002, -19990, -19986, -19982, -19976, -19805, -19784, -19775, -19774, -19763, -19756, -19751, -19746, -19741, -19739, -19728,
            -19725, -19715, -19540, -19531, -19525, -19515, -19500, -19484, -19479, -19467, -19289, -19288, -19281, -19275, -19270, -19263, -19261,
            -19249, -19243, -19242, -19238, -19235, -19227, -19224, -19218, -19212, -19038, -19023, -19018, -19006, -19003, -18996, -18977, -18961,
            -18952, -18783, -18774, -18773, -18763, -18756, -18741, -18735, -18731, -18722, -18710, -18697, -18696, -18526, -18518, -18501, -18490,
            -18478, -18463, -18448, -18447, -18446, -18239, -18237, -18231, -18220, -18211, -18201, -18184, -18183, -18181, -18012, -17997, -17988,
            -17970, -17964, -17961, -17950, -17947, -17931, -17928, -17922, -17759, -17752, -17733, -17730, -17721, -17703, -17701, -17697, -17692,
            -17683, -17676, -17496, -17487, -17482, -17468, -17454, -17433, -17427, -17417, -17202, -17185, -16983, -16970, -16942, -16915, -16733,
            -16708, -16706, -16689, -16664, -16657, -16647, -16474, -16470, -16465, -16459, -16452, -16448, -16433, -16429, -16427, -16423, -16419,
            -16412, -16407, -16403, -16401, -16393, -16220, -16216, -16212, -16205, -16202, -16187, -16180, -16171, -16169, -16158, -16155, -15959,
            -15958, -15944, -15933, -15920, -15915, -15903, -15889, -15878, -15707, -15701, -15681, -15667, -15661, -15659, -15652, -15640, -15631,
            -15625, -15454, -15448, -15436, -15435, -15419, -15416, -15408, -15394, -15385, -15377, -15375, -15369, -15363, -15362, -15183, -15180,
            -15165, -15158, -15153, -15150, -15149, -15144, -15143, -15141, -15140, -15139, -15128, -15121, -15119, -15117, -15110, -15109, -14941,
            -14937, -14933, -14930, -14929, -14928, -14926, -14922, -14921, -14914, -14908, -14902, -14894, -14889, -14882, -14873, -14871, -14857,
            -14678, -14674, -14670, -14668, -14663, -14654, -14645, -14630, -14594, -14429, -14407, -14399, -14384, -14379, -14368, -14355, -14353,
            -14345, -14170, -14159, -14151, -14149, -14145, -14140, -14137, -14135, -14125, -14123, -14122, -14112, -14109, -14099, -14097, -14094,
            -14092, -14090, -14087, -14083, -13917, -13914, -13910, -13907, -13906, -13905, -13896, -13894, -13878, -13870, -13859, -13847, -13831,
            -13658, -13611, -13601, -13406, -13404, -13400, -13398, -13395, -13391, -13387, -13383, -13367, -13359, -13356, -13343, -13340, -13329,
            -13326, -13318, -13147, -13138, -13120, -13107, -13096, -13095, -13091, -13076, -13068, -13063, -13060, -12888, -12875, -12871, -12860,
            -12858, -12852, -12849, -12838, -12831, -12829, -12812, -12802, -12607, -12597, -12594, -12585, -12556, -12359, -12346, -12320, -12300,
            -12120, -12099, -12089, -12074, -12067, -12058, -12039, -11867, -11861, -11847, -11831, -11798, -11781, -11604, -11589, -11536, -11358,
            -11340, -11339, -11324, -11303, -11097, -11077, -11067, -11055, -11052, -11045, -11041, -11038, -11024, -11020, -11019, -11018, -11014,
            -10838, -10832, -10815, -10800, -10790, -10780, -10764, -10587, -10544, -10533, -10519, -10331, -10329, -10328, -10322, -10315, -10309,
            -10307, -10296, -10281, -10274, -10270, -10262, -10260, -10256, -10254};
    public static String[] pystr = new String[]{"a", "ai", "an", "ang", "ao", "ba", "bai", "ban", "bang", "bao", "bei", "ben", "beng", "bi", "bian",
            "biao", "bie", "bin", "bing", "bo", "bu", "ca", "cai", "can", "cang", "cao", "ce", "ceng", "cha", "chai", "chan", "chang", "chao", "che",
            "chen", "cheng", "chi", "chong", "chou", "chu", "chuai", "chuan", "chuang", "chui", "chun", "chuo", "ci", "cong", "cou", "cu", "cuan",
            "cui", "cun", "cuo", "da", "dai", "dan", "dang", "dao", "de", "deng", "di", "dian", "diao", "die", "ding", "diu", "dong", "dou", "du",
            "duan", "dui", "dun", "duo", "e", "en", "er", "fa", "fan", "fang", "fei", "fen", "feng", "fo", "fou", "fu", "ga", "gai", "gan", "gang",
            "gao", "ge", "gei", "gen", "geng", "gong", "gou", "gu", "gua", "guai", "guan", "guang", "gui", "gun", "guo", "ha", "hai", "han", "hang",
            "hao", "he", "hei", "hen", "heng", "hong", "hou", "hu", "hua", "huai", "huan", "huang", "hui", "hun", "huo", "ji", "jia", "jian",
            "jiang", "jiao", "jie", "jin", "jing", "jiong", "jiu", "ju", "juan", "jue", "jun", "ka", "kai", "kan", "kang", "kao", "ke", "ken",
            "keng", "kong", "kou", "ku", "kua", "kuai", "kuan", "kuang", "kui", "kun", "kuo", "la", "lai", "lan", "lang", "lao", "le", "lei", "leng",
            "li", "lia", "lian", "liang", "liao", "lie", "lin", "ling", "liu", "long", "lou", "lu", "lv", "luan", "lue", "lun", "luo", "ma", "mai",
            "man", "mang", "mao", "me", "mei", "men", "meng", "mi", "mian", "miao", "mie", "min", "ming", "miu", "mo", "mou", "mu", "na", "nai",
            "nan", "nang", "nao", "ne", "nei", "nen", "neng", "ni", "nian", "niang", "niao", "nie", "nin", "ning", "niu", "nong", "nu", "nv", "nuan",
            "nue", "nuo", "o", "ou", "pa", "pai", "pan", "pang", "pao", "pei", "pen", "peng", "pi", "pian", "piao", "pie", "pin", "ping", "po", "pu",
            "qi", "qia", "qian", "qiang", "qiao", "qie", "qin", "qing", "qiong", "qiu", "qu", "quan", "que", "qun", "ran", "rang", "rao", "re",
            "ren", "reng", "ri", "rong", "rou", "ru", "ruan", "rui", "run", "ruo", "sa", "sai", "san", "sang", "sao", "se", "sen", "seng", "sha",
            "shai", "shan", "shang", "shao", "she", "shen", "sheng", "shi", "shou", "shu", "shua", "shuai", "shuan", "shuang", "shui", "shun",
            "shuo", "si", "song", "sou", "su", "suan", "sui", "sun", "suo", "ta", "tai", "tan", "tang", "tao", "te", "teng", "ti", "tian", "tiao",
            "tie", "ting", "tong", "tou", "tu", "tuan", "tui", "tun", "tuo", "wa", "wai", "wan", "wang", "wei", "wen", "weng", "wo", "wu", "xi",
            "xia", "xian", "xiang", "xiao", "xie", "xin", "xing", "xiong", "xiu", "xu", "xuan", "xue", "xun", "ya", "yan", "yang", "yao", "ye", "yi",
            "yin", "ying", "yo", "yong", "you", "yu", "yuan", "yue", "yun", "za", "zai", "zan", "zang", "zao", "ze", "zei", "zen", "zeng", "zha",
            "zhai", "zhan", "zhang", "zhao", "zhe", "zhen", "zheng", "zhi", "zhong", "zhou", "zhu", "zhua", "zhuai", "zhuan", "zhuang", "zhui",
            "zhun", "zhuo", "zi", "zong", "zou", "zu", "zuan", "zui", "zun", "zuo"};
    private StringBuilder buffer;
    private String resource;
    private static CharacterParser characterParser = new CharacterParser();

    public static CharacterParser getInstance() {
        return characterParser;
    }

    public String getResource() {
        return resource;
    }

    public void setResource(String resource) {
        this.resource = resource;
    }

    /**
     * 汉字转成ASCII码 * * @param chs * @return
     */
    private int getChsAscii(String chs) {
        int asc = 0;
        try {
            byte[] bytes = chs.getBytes("gb2312");
            if (bytes == null || bytes.length > 2 || bytes.length <= 0) {
                throw new RuntimeException("illegal resource string");
            }
            if (bytes.length == 1) {
                asc = bytes[0];
            }
            if (bytes.length == 2) {
                int hightByte = 256 + bytes[0];
                int lowByte = 256 + bytes[1];
                asc = (256 * hightByte + lowByte) - 256 * 256;
            }
        } catch (Exception e) {
            System.out.println("ERROR:ChineseSpelling.class-getChsAscii(String chs)" + e);
        }
        return asc;
    }

    /**
     * 单字解析 * * @param str * @return
     */
    public String convert(String str) {
        String result = null;
        int ascii = getChsAscii(str);
        if (ascii > 0 && ascii < 160) {
            result = String.valueOf((char) ascii);
        } else {
            for (int i = (pyvalue.length - 1); i >= 0; i--) {
                if (pyvalue[i] <= ascii) {
                    result = pystr[i];
                    break;
                }
            }
        }
        return result;
    }

    /**
     * 词组解析 * * @param chs * @return
     */
    public String getSelling(String chs) {
        String key, value;
        buffer = new StringBuilder();
        for (int i = 0; i < chs.length(); i++) {
            key = chs.substring(i, i + 1);
            if (key.getBytes().length >= 2) {
                value = (String) convert(key);
                if (value == null) {
                    value = "unknown";
                }
            } else {
                value = key;
            }
            buffer.append(value);
        }
        return buffer.toString();
    }

    public String getSpelling() {
        return this.getSelling(this.getResource());
    }

}

调用：

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泛化各种关系的强弱顺序

各种关系的强弱顺序：

1
泛化(继承) = 实现(接口) > 组合() > 聚合() > 关联(拥有) > 依赖(使用)
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监听app切换前后台

ActivityLifecycleCallbacks使用要求API 14+ （Android 4.0+）。

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public class ForegroundCallbacks implements Application.ActivityLifecycleCallbacks {
    public static final long CHECK_DELAY = 500;
    public static final String TAG = ForegroundCallbacks.class.getName();
    public interface Listener {
        public void onBecameForeground();
        public void onBecameBackground();
    }
    private static ForegroundCallbacks instance;
    private boolean foreground = false, paused = true;
    private Handler handler = new Handler();
    private List<Listener> listeners = new CopyOnWriteArrayList<Listener>();
    private Runnable check;
    public static ForegroundCallbacks init(Application application){
        if (instance == null) {
            instance = new ForegroundCallbacks();
            application.registerActivityLifecycleCallbacks(instance);
        }
        return instance;
    }
    public static ForegroundCallbacks get(Application application){
        if (instance == null) {
            init(application);
        }
        return instance;
    }
    public static ForegroundCallbacks get(Context ctx){
        if (instance == null) {
            Context appCtx = ctx.getApplicationContext();
            if (appCtx instanceof Application) {
                init((Application)appCtx);
            }
            throw new IllegalStateException(
                    "Foreground is not initialised and " +
                            "cannot obtain the Application object");
        }
        return instance;
    }
    public static ForegroundCallbacks get(){
        if (instance == null) {
            throw new IllegalStateException(
                    "Foreground is not initialised - invoke " +
                            "at least once with parameterised init/get");
        }
        return instance;
    }
    public boolean isForeground(){
        return foreground;
    }
    public boolean isBackground(){
        return !foreground;
    }
    public void addListener(Listener listener){
        listeners.add(listener);
    }
    public void removeListener(Listener listener){
        listeners.remove(listener);
    }
    @Override
    public void onActivityResumed(Activity activity) {
        paused = false;
        boolean wasBackground = !foreground;
        foreground = true;
        if (check != null)
            handler.removeCallbacks(check);
        if (wasBackground){
           L.d ("went foreground");

            for (Listener l : listeners) {
                try {
                    l.onBecameForeground();


                } catch (Exception exc) {
                    L.d ("Listener threw exception!:"+exc.toString());
                }
            }
        } else {
            L.d ("still foreground");
        }
    }
    @Override
    public void onActivityPaused(Activity activity) {
        paused = true;
        if (check != null)
            handler.removeCallbacks(check);
        handler.postDelayed(check = new Runnable(){
            @Override
            public void run() {
                if (foreground && paused) {
                    foreground = false;
                    L.d ("went background");
                    for (Listener l : listeners) {
                        try {
                            l.onBecameBackground();
                        } catch (Exception exc) {
                            L.d ("Listener threw exception!:"+exc.toString());
                        }
                    }
                } else {
                    L.d ("still foreground");
                }
            }
        }, CHECK_DELAY);
    }
    @Override
    public void onActivityCreated(Activity activity, Bundle savedInstanceState) {}
    @Override
    public void onActivityStarted(Activity activity) {}
    @Override
    public void onActivityStopped(Activity activity) {}
    @Override
    public void onActivitySaveInstanceState(Activity activity, Bundle outState) {}
    @Override
    public void onActivityDestroyed(Activity activity) {}
}
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ListView相关

ListView的setOnItemClickListener无效

问题：使用listview的时候遇到了设置item监听事件的时候在没有回调onItemClick 方法的问题

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