Android 常用方法集合工具类CommonUtil

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Android 常用方法集合工具类CommonUtil

public class CommonUtil {

    /**
     * 判断当前网络是否连接
     * 
     * @param context
     * @return
     */
    public static boolean isNetConnected(Context context) {
        ConnectivityManager connectivityManager = (ConnectivityManager) context
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo info = connectivityManager.getActiveNetworkInfo();
        if (info != null && info.isConnected()) {
            return true;
        }
        return false;
    }

    /**
     * dip 转 px
     * 
     * @param context
     * @param dipValue
     * @return
     */
    public static int dip2px(Context context, float dipValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dipValue * scale + 0.5f);
    }

    /**
     * px 转 dip
     * 
     * @param context
     * @param pxValue
     * @return
     */
    public static int px2dip(Context context, float pxValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (pxValue / scale + 0.5f);
    }

    /**
     * 判断服务是否运行
     * 
     * @param context
     * @param clazz
     *            要判断的服务的class
     * @return
     */
    public static boolean isServiceRunning(Context context, Class<? extends Service> clazz) {
        ActivityManager manager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);

        List<RunningServiceInfo> services = manager.getRunningServices(100);
        for (int i = 0; i < services.size(); i++) {
            String className = services.get(i).service.getClassName();
            if (className.equals(clazz.getName())) {
                return true;
            }
        }
        return false;
    }

    /**
     * 把汉字转换成拼音
     * @param inputString
     * @return
     */
    public static String getPinYin(String inputString) {
        HanyuPinyinOutputFormat format = new HanyuPinyinOutputFormat();
        format.setCaseType(HanyuPinyinCaseType.LOWERCASE);
        format.setToneType(HanyuPinyinToneType.WITH_TONE_MARK);
        format.setVCharType(HanyuPinyinVCharType.WITH_U_UNICODE);

        char[] input = inputString.trim().toCharArray();
        StringBuffer output = new StringBuffer("");
        try {
            for (int i = 0; i < input.length; i++) {
                if (Character.toString(input[i]).matches("[//u4E00-//u9FA5]+")) {
                    String[] temp = PinyinHelper.toHanyuPinyinStringArray(input[i], format);
                    output.append(temp[0]);
                    output.append(" ");
                } else
                    output.append(Character.toString(input[i]));
            }
        } catch (BadHanyuPinyinOutputFormatCombination e) {
            e.printStackTrace();
        }
        return output.toString();
    }

    /**
     * 得到拼音里的首字母
     * @param inputString
     * @return
     */
    public static String getFirstAlpha(String inputString) {
        if (inputString != null) {
            String[] array = PinyinHelper.toHanyuPinyinStringArray(inputString.charAt(0));
            if (array == null) {
                return inputString.substring(0, 1).toUpperCase();
            } else {
                return array[0].toUpperCase();
            }
        }
        return "";
    }

    public static String getDateFormat(long time) {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        return sdf.format(new Date(time));
    }

    /**
     * 加密
     * @param inStr
     * @return
     */
    public static String string2MD5(String inStr) {
        MessageDigest md5 = null;
        try {
            md5 = MessageDigest.getInstance("MD5");
        } catch (Exception e) {
            System.out.println(e.toString());
            e.printStackTrace();
            return "";
        }
        char[] charArray = inStr.toCharArray();
        byte[] byteArray = new byte[charArray.length];

        for (int i = 0; i < charArray.length; i++)
            byteArray[i] = (byte) charArray[i];
        byte[] md5Bytes = md5.digest(byteArray);
        StringBuffer hexValue = new StringBuffer();
        for (int i = 0; i < md5Bytes.length; i++) {
            int val = ((int) md5Bytes[i]) & 0xff;
            if (val < 16)
                hexValue.append("0");
            hexValue.append(Integer.toHexString(val));
        }
        return hexValue.toString();
    }
}