整理Android项目开发中使用频率很高的小方法，不用每次再写
{/*** 判断网络连接是否打开*/(Context ctx) {boolean flag = false;ConnectivityManager netManager = (ConnectivityManager) ctx.getSystemService(Context.CONNECTIVITY_SERVICE);if (netManager.getActiveNetworkInfo() != null) {flag = netManager.getActiveNetworkInfo().isAvailable();}return flag;}/*** 获取Manifest中的meta-data值* @param context* @param metaKey* @return*/public static String getMetaValue(Context context, String metaKey) {Bundle metaData = null;String values = null;if (context == null || metaKey == null) {return null;}try {ApplicationInfo ai = context.getPackageManager().getApplicationInfo(context.getPackageName(),PackageManager.GET_META_DATA);if (null != ai) {metaData = ai.metaData;}if (null != metaData) {values = metaData.getString(metaKey);}} catch (NameNotFoundException e) {}return values;}/*** 获取软件版本*/public static String thisVersion(Context context) {final String unknown = “Unknown”;if (context == null)return unknown;try {String ret = context.getPackageManager().getPackageInfo(context.getPackageName(), 0).versionName;if (ret.contains(” + “))ret = ret.substring(0, ret.indexOf(” + “)) + “b”;return ret;} catch (NameNotFoundException ex) {}return unknown;}/*** 判断是否装有SD卡、是否可读写、是否有空间** @param size 需存入的文件大小，SD剩余空间必须大于该值* @return true可用，false不可用*/(long size) {try {/* 读取SD卡大小 */File storage = Environment.getExternalStorageDirectory();StatFs stat = new StatFs(storage.getPath());long blocks = stat.getAvailableBlocks();long blocksize = stat.getBlockSize();/* 判断 */if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED) && (blocks * blocksize) > size) {return true;} else {return false;}} catch (Exception e) {e.printStackTrace();return false;}}/*** 字节的大小，转成口头语* @param size* @return*/public static String byte2Oral(double size) {DecimalFormat df = new DecimalFormat(“0.0”);StringBuffer datas = new StringBuffer();if (size < 1048576) {datas.append((int) (size / 1024)).append(“KB”);} else if (size > 1048576) {datas.append(df.format((size / 1048576))).append(“MB”);} else if (size < 1024) {datas.append(size).append(“B”);}return datas.toString();}/*** dip转px** @param dipValue* @return*/(Context ctx, int dipValue) {Resources r = ctx.getResources();int px = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dipValue, r.getDisplayMetrics());return px;}/*** 判断当前应用程序是否处于后台，，通过getRunningTasks的方式* @return true 在后台; false 在前台*/(String packageName, Context context) {ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);List<RunningTaskInfo> tasks = activityManager.getRunningTasks(1);if (!tasks.isEmpty()) {ComponentName topActivity = tasks.get(0).topActivity;if (!topActivity.getPackageName().equals(packageName)) {return true;}}return false;}/*** 获取包名* @param ctx* @return*/public static String getPackageName(Context ctx) {try {PackageInfo info = ctx.getPackageManager().getPackageInfo(ctx.getPackageName(), 0);return info.packageName;} catch (NameNotFoundException e) {e.printStackTrace();return null;}}/*** 取缓存的路径，存储卡的话，至少得1M空间** @return*/public static File getCachePath(Context ctx, String uniqueName) {if (Common.checkSDStatus(1)) {File(ctx.getExternalCacheDir().getPath(), uniqueName);} else {File(ctx.getCacheDir().getPath(), uniqueName);}}/*** 判断字符串是否有空* @param str* @return*/public static String doNullStr(String str) {return TextUtils.isEmpty(str) ? “” : str;}/*** 获取设备信息* @param context* @return*/public static Map<String, String> getDeviceInfo(Context context) {Map<String, String> map = new HashMap<String, String>();android.telephony.TelephonyManager tm = (android.telephony.TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);String device_id = tm.getDeviceId();String msisdn = tm.getLine1Number(); // 手机号码String iccid = tm.getSimSerialNumber(); // sim卡号ICCIDString imsi = tm.getSubscriberId(); // imsiandroid.net.wifi.WifiManager wifi = (android.net.wifi.WifiManager) context.getSystemService(Context.WIFI_SERVICE);int i = wifi.getConnectionInfo().getIpAddress();String ip = ((i & 0xff) + “.” + (i >> 8 & 0xff) + “.” + (i >> 16 & 0xff) + “.” + (i >> 24 & 0xff));String mac = wifi.getConnectionInfo().getMacAddress();if (TextUtils.isEmpty(device_id)) {device_id = mac;}if (TextUtils.isEmpty(device_id)) {device_id = android.provider.Settings.Secure.getString(context.getContentResolver(),android.provider.Settings.Secure.ANDROID_ID);}map.put(“ip”, doNullStr(ip));map.put(“mac”, doNullStr(mac));map.put(“device_id”, doNullStr(device_id));map.put(“msisdn”, doNullStr(msisdn));map.put(“iccid”, doNullStr(iccid));map.put(“imsi”, doNullStr(imsi));return map;}/*** 复制文件至某个文件夹* @param srcFileName 源文件完整路径* @param destDirName 目的目录完整路径，包含文件名* @return*/(String srcFileName, String destDirName) {try {int byteread = 0;File oldfile = new File(srcFileName);if (oldfile.exists()) {InputStream inStream = new FileInputStream(oldfile);FileOutputStream fs = new FileOutputStream(destDirName);byte[] buffer = new byte[1444];while ((byteread = inStream.read(buffer)) != -1) {fs.write(buffer, 0, byteread);}inStream.close();}return true;} catch (Exception e) {e.printStackTrace();return false;}}/*** 判断是否是身份证** @param identifyCard*/(String identifyCard){Pattern p = Pattern.compile(“(\\d{14}[0-9a-zA-Z])|(\\d{17}[0-9a-zA-Z])”);Matcher m = p.matcher(identifyCard);return m.matches();}/*** 判断电话号码是否有效* 移动：134、135、136、137、138、139、147、150、151、152、157、158、159、182、183、187、188* 联通：130、131、132、145、155、156、185、186* 电信：133、153、180、181、189* 虚拟运营商：17x*/(String number) {if (number.startsWith(“+86”)) {number = number.substring(3);}if (number.startsWith(“+”) || number.startsWith(“0″)) {number = number.substring(1);}number = number.replace(” “, “”).replace(“-“, “”);System.out.print(“号码：” + number);Pattern p = Pattern.compile(“^((13[0-9])|(15[^4,\\D])|(18[0-3,5-9])|(17[0-9]))\\d{8}$”);Matcher m = p.matcher(number);return m.matches();}/*** 号码的运营商类型** @param number* @return*/public static String getMobileType(String number) {String type = “未知用户”;Pattern p = Pattern.compile(“^(([4,8]00))\\d{7}$”);if (p.matcher(number).matches())return “企业电话”;if (number.startsWith(“+86”)) {number = number.substring(3);}if (number.startsWith(“+”) || number.startsWith(“0″)) {number = number.substring(1);}number = number.replace(” “, “”).replace(“-“, “”);System.out.print(“号码：” + number);p = Pattern.compile(“^((13[4-9])|(147)|(15[0-2,7-9])|(18[2,3,7,8]))\\d{8}$”);if (p.matcher(number).matches())return “移动用户”;p = Pattern.compile(“^((13[0-2])|(145)|(15[5,6])|(18[5,6]))\\d{8}$”);if (p.matcher(number).matches())return “联通用户”;p = Pattern.compile(“^((1[3,5]3)|(18[0,1,9]))\\d{8}$”);if (p.matcher(number).matches())return “电信用户”;p = Pattern.compile(“^((17[0-9]))\\d{8}$”);if (p.matcher(number).matches())return “虚拟运营端”;if (number.length() >= 7 && number.length() <= 12)return “固话用户”;return type;}/*** 获取随机数* @param iRdLength* @return*/public static String getRandom(int iRdLength) {Random rd = new Random();int iRd = rd.nextInt();if (iRd < 0) { // 负数时转换为正数iRd *= -1;}String sRd = String.valueOf(iRd);int iLgth = sRd.length();if (iRdLength > iLgth) { // 获取数长度超过随机数长度return digitToString(iRd, iRdLength);} else {return sRd.substring(iLgth – iRdLength, iLgth);}}/*** 把一个整数转化为一个n位的字符串* @param digit* @param n* @return*/public static String digitToString(int digit, int n) {String result = “”;for (int i = 0; i < n – String.valueOf(digit).length(); i++) {result = result + “0”;}result = result + String.valueOf(digit);return result;}/*** 计算MD5* @param str* @return*/public static String MD5(String str) {try {MessageDigest md = MessageDigest.getInstance(“MD5”);md.update(str.getBytes(“utf-8”));byte[] result = md.digest();StringBuffer sb = new StringBuffer(32);for (int i = 0; i < result.length; i++) {int val = result[i] & 0xff;if (val <= 0xf) {sb.append(“0”);}sb.append(Integer.toHexString(val));}return sb.toString();//.toUpperCase();} catch (NoSuchAlgorithmException e) {e.printStackTrace();return “”;} catch (UnsupportedEncodingException e) {e.printStackTrace();return “”;}}public static String double_convert(double value) {(ret – (int) ret == 0) {return (int) ret + “”;} else {return ret + “”;}}/*** 根据字符串，计算出其占用的宽度* @param str* @param textsize* @return*/(String str, float textsize) {Paint mPaint = new Paint();mPaint.setTextSize(textsize);return str.length() * mPaint.getFontSpacing();}EARTH_RADIUS =6378137.0;(double longitude1, double latitude1,double longitude2, double latitude2) {double Lat1 = rad(latitude1);double Lat2 = rad(latitude2);double a = Lat1 – Lat2;double b = rad(longitude1) – rad(longitude2);double s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2)+ Math.cos(Lat1) * Math.cos(Lat2)* Math.pow(Math.sin(b / 2), 2)));s = s * EARTH_RADIUS;s = Math.round(s * 10000) / 10000;return s;}(double d) {return d * Math.PI / 180.0;} }
未曾失败的人恐怕也未曾成功过。
