安卓开发过程中的工具类

对指定字符串进行MD5加密

public static String EncryptMD5(String s) {    char hexDigits[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',            'a', 'b', 'c', 'd', 'e', 'f'};    try {        byte[] btInput = s.getBytes();        // 获得MD5摘要算法的 MessageDigest 对象        MessageDigest mdInst = MessageDigest.getInstance("MD5");        // 使用指定的字节更新摘要        mdInst.update(btInput);        // 获得密文        byte[] md = mdInst.digest();        // 把密文转换成十六进制的字符串形式        int j = md.length;        char str[] = new char[j * 2];        int k = 0;        for (int i = 0; i < j; i++) {            byte byte0 = md[i];            str[k++] = hexDigits[byte0 >>> 4 & 0xf];            str[k++] = hexDigits[byte0 & 0xf];        }        return new String(str);    } catch (Exception e) {        e.printStackTrace();        return null;    }}

判断email格式是否正确

public static boolean isEmail(String email) {    String str = "^([a-zA-Z0-9_\\-\\.]+)@((\\[[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.)|(([a-zA-Z0-9\\-]+\\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\\]?)$";    Pattern p = Pattern.compile(str);    Matcher m = p.matcher(email);    return m.matches();}

判断mobile格式是否正确

public static boolean isMobile(String mobile) {    String str = "^(13[0-9]|14[0-9]|15[0-9]|17[0-9]|18[0-9])[0-9]{8}$";    Pattern p = Pattern.compile(str);    Matcher m = p.matcher(mobile);    return m.matches();}

验证是否是身份证号

public static boolean isIDCard(String IDCard) {    Pattern idNumPattern = Pattern.compile("(\\d{14}[0-9a-zA-Z])|(\\d{17}[0-9a-zA-Z])");    Matcher m = idNumPattern.matcher(IDCard);    return m.matches();}

根据身份证号码获取生日

public static String getBirthdayFromIdCard(String idCard) {    if (TextUtils.isEmpty(idCard)) return null;    String date = "";    if (idCard.length() == 18) {        date = idCard.substring(6, 14);    } else if (idCard.length() == 15) {        date = "19" + idCard.substring(6, 12);    } else {//身份证号有误或者不是身份证号        return null;    }    String birthday = date.substring(0, 4) + "-" + date.substring(4, 6) + "-" + date.substring(6, 8);    return birthday;}

根据身份证号码获取性别,倒数第二位是奇数就是男性,偶数就是女性

public static Integer getSexFromIdCard(String idCard) {    if (TextUtils.isEmpty(idCard)) return null;    if (idCard.length() < 18) return null;    String sex = idCard.substring(16, 17);    if (Integer.parseInt(sex) % 2 == 0) {//女        return 0;    } else {//男        return 1;    }}

根据语言系统判断是否是中国

public static boolean isZh() {    Locale locale = BaseApplication.getInstance().getResources().getConfiguration().locale;    String language = locale.getLanguage();    if (language.startsWith("zh")) {        return true;    } else {        return false;    }}

获取联系人电话

private String getContactPhone(Context context, Cursor cursor) {    int phoneColumn = cursor.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER);    int phoneNum = cursor.getInt(phoneColumn);    String phoneResult = "";    if (phoneNum > 0) {        // 获得联系人的ID号        int idColumn = cursor.getColumnIndex(ContactsContract.Contacts._ID);        String contactId = cursor.getString(idColumn);        // 获得联系人的电话号码的cursor;        Cursor phones = context.getContentResolver().query(                ContactsContract.CommonDataKinds.Phone.CONTENT_URI,                null,                ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = " + contactId,                null, null);        if (phones.moveToFirst()) {            // 遍历所有的电话号码            for (; !phones.isAfterLast(); phones.moveToNext()) {                int index = phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER);                int typeindex = phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.TYPE);                int phone_type = phones.getInt(typeindex);                String phoneNumber = phones.getString(index);                switch (phone_type) {                    case 2:                        phoneResult = phoneNumber;                        break;                }            }            if (!phones.isClosed()) {                phones.close();            }        }    }    return phoneResult;}

拨打指定号码的电话

public static void call(Context context, String mobile) {    Intent intent = new Intent();    intent.setAction("android.intent.action.CALL");    intent.setData(Uri.parse("tel:" + mobile));    context.startActivity(intent);}

隐藏软键盘

public static void hideSoftInput(Activity activity, View view) {    if (view == null) return;    InputMethodManager imm = (InputMethodManager) activity            .getSystemService(Context.INPUT_METHOD_SERVICE);    imm.hideSoftInputFromWindow(view.getWindowToken(), 0);}

显示软键盘

public static void showSoftInput(Activity activity, View view) {    view.setFocusable(true);    view.setFocusableInTouchMode(true);    view.requestFocus();    InputMethodManager imm = (InputMethodManager) activity.getSystemService(Context.INPUT_METHOD_SERVICE);    imm.toggleSoftInput(0, InputMethodManager.SHOW_FORCED);}

防止按钮多次点击

private static long lastClickTime;

public static boolean isFastDoubleClick(int number) {    long time = System.currentTimeMillis();    long timeD = time - lastClickTime;    if (0 < timeD && timeD < number) {        return false;    }    lastClickTime = time;    return true;}

获取手机app应用

public static List<OtherAppInfo> scanLocalInstallAppList(PackageManager packageManager) {    List<OtherAppInfo> otherAppInfoList = new ArrayList<>();    Map<String, Object> mapAllLocalApp = new HashMap<String, Object>();    try {        List<PackageInfo> installedPackages = packageManager.getInstalledPackages(0);        for (int i = 0; i < installedPackages.size(); i++) {            PackageInfo packageInfo = installedPackages.get(i);            //是否要过滤掉系统app            if ((ApplicationInfo.FLAG_SYSTEM & packageInfo.applicationInfo.flags) != 0) {                continue;            }            OtherAppInfo otherAppInfo = new OtherAppInfo();            if (packageInfo.applicationInfo.packageName.equals("com.lenew.appstore")) {                mapAllLocalApp.put(packageInfo.applicationInfo.packageName, packageInfo.versionCode);                continue;            }            otherAppInfo.appName = packageInfo.applicationInfo.loadLabel(packageManager).toString();            otherAppInfo.appPackageName = packageInfo.packageName;            otherAppInfo.appImg = packageInfo.applicationInfo.loadIcon(packageManager);            otherAppInfo.versionName = packageInfo.versionName;            otherAppInfo.versionCode = packageInfo.versionCode;            //获取apk的大小            String dir = packageInfo.applicationInfo.publicSourceDir;            int size = Integer.valueOf((int) new File(dir).length());            otherAppInfo.appCount = size;            //   otherAppInfo.packageVersions = packageInfo.versionName;            otherAppInfoList.add(otherAppInfo);        }    } catch (Exception e) {        e.printStackTrace();        //获取包应用失败    }    return otherAppInfoList;}

格式化单位

public static String getFormatSize(int size) {    double kiloByte = size / 1024;    if (kiloByte < 1) {        return size + "B";    }    double megaByte = kiloByte / 1024;    if (megaByte < 1) {        BigDecimal result1 = new BigDecimal(Double.toString(kiloByte));        return result1.setScale(2, BigDecimal.ROUND_HALF_UP)                .toPlainString() + "K";    }    double gigaByte = megaByte / 1024;    if (gigaByte < 1) {        BigDecimal result2 = new BigDecimal(Double.toString(megaByte));        return result2.setScale(2, BigDecimal.ROUND_HALF_UP)                .toPlainString() + "M";    }    double teraBytes = gigaByte / 1024;    if (teraBytes < 1) {        BigDecimal result3 = new BigDecimal(Double.toString(gigaByte));        return result3.setScale(2, BigDecimal.ROUND_HALF_UP)                .toPlainString() + "G";    }    BigDecimal result4 = new BigDecimal(teraBytes);    return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString()            + "T";}

文件大小转字符串(带单位K/KB/MB/GB)

public static String fileSizeToString(long size) {    if (size < 1024) {        return size + "B";    } else if (size < 1024 * 1024) {        return String.format("%.2fK", (double) size / 1024);    } else if (size < 1024 * 1024 * 1024) {        return String.format("%.2fM", (double) size / 1024 / 1024);    } else if (size < 1024 * 1024 * 1024 * 1024) {        return String.format("%.2fG", (double) size / 1024 / 1024 / 1024);    } else {        return String.format("%.2fT", (double) size / 1024 / 1024 / 1024 / 1024);    }}

px值转dip或dp值,保证尺寸大小不变

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

dip或dp值转换为px值,保证尺寸大小不变

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

将px值转换为sp值,保证文字大小不变

public static int px2sp(Context context, float pxValue) {    final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;    return (int) (pxValue / fontScale + 0.5f);}

将sp值转换成px值,保证文字大小不变

public static int sp2px(Context context, float spValue) {    final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;    return (int) (spValue * fontScale + 0.5f);}

删除单位文件

public static boolean deleteFile(String sPath) {    boolean flag = false;    if (sPath == null) {        return flag;    }    File file = new File(sPath);    // 路径为文件且不为空则进行删除    if (file.isFile() && file.exists()) {        file.delete();        flag = true;    }    return flag;}

计算百分比

public static int accuracy(double presentNum, double allCount) {    DecimalFormat df = (DecimalFormat) NumberFormat.getInstance();    //可以设置精确几位小数    df.setMaximumFractionDigits(1);    //模式 例如四舍五入    df.setRoundingMode(RoundingMode.HALF_UP);    double accuracy_num = presentNum / allCount * 100;    return (int) accuracy_num;   // return df.format(accuracy_num);}