android Utils工具类方法大集合

/**
     * 提供精确的小数位四舍五入处理，保留几位小数。
     *
     * @param v     需要四舍五入的数字
     * @param scale 小数点后保留几位
     * @return 四舍五入后的结果
     */
    public static double round(double v, int scale) {
        if (scale < 0) {
            throw new IllegalArgumentException("The scale must be a positive integer or zero");
        }
        BigDecimal b = new BigDecimal(Double.toString(v));
        BigDecimal one = new BigDecimal("1");
        double bb = b.divide(one, scale, BigDecimal.ROUND_HALF_UP).doubleValue();
        return bb;
    }

    /**
     * 提供（相对）精确的除法运算。当发生除不尽的情况时，由scale参数指 定精度，以后的数字四舍五入。
     *
     * @param v1    被除数
     * @param v2    除数
     * @param scale 表示表示需要精确到小数点以后几位。
     * @return 两个参数的商
     */
    public static double div(double v1, double v2, int scale) {
        if (scale < 0) {
            throw new IllegalArgumentException("The scale must be a positive integer or zero");
        }
        BigDecimal b1 = new BigDecimal(Double.toString(v1));
        BigDecimal b2 = new BigDecimal(Double.toString(v2));
        return b1.divide(b2, scale, BigDecimal.ROUND_HALF_UP).doubleValue();
    }

    /**
     * 提供精确的乘法运算。
     *
     * @param v1 被乘数
     * @param v2 乘数
     * @return 两个参数的积
     */
    public static double mul(double v1, double v2) {
        BigDecimal b1 = new BigDecimal(Double.toString(v1));
        BigDecimal b2 = new BigDecimal(Double.toString(v2));
        return b1.multiply(b2).doubleValue();
    }

    /**
     * 检查手机上是否安装了指定的软件
     *
     * @param context
     * @param packageName ：应用包名
     * @return
     */
    public static boolean isAvilible(Context context, String packageName) {
        // 获取packagemanager
        PackageManager packageManager = context.getPackageManager();
        // 获取所有已安装程序的包信息
        List<PackageInfo> packageInfos = packageManager.getInstalledPackages(0);
        // 用于存储所有已安装程序的包名
        List<String> packageNames = new ArrayList<String>();
        // 从pinfo中将包名字逐一取出，压入pName list中
        if (packageInfos != null) {
            for (int i = 0; i < packageInfos.size(); i++) {
                String packName = packageInfos.get(i).packageName;
                packageNames.add(packName);
            }
        }
        // 判断packageNames中是否有目标程序的包名，有TRUE，没有FALSE
        return packageNames.contains(packageName);
    }

    /**
     * 根据一个网络连接(String)获取bitmap图像
     *
     * @param imageUri
     * @return
     */
    public static Bitmap getbitmap(String imageUri) {
        Log.v("", "getbitmap:" + imageUri);
        // 显示网络上的图片
        Bitmap bitmap = null;
        try {
            URL myFileUrl = new URL(imageUri);
            HttpURLConnection conn = (HttpURLConnection) myFileUrl
                    .openConnection();
            conn.setDoInput(true);
            conn.connect();
            InputStream is = conn.getInputStream();
            bitmap = BitmapFactory.decodeStream(is);
            is.close();

            Log.v("", "image download finished." + imageUri);
        } catch (OutOfMemoryError e) {
            e.printStackTrace();
            bitmap = null;
        } catch (IOException e) {
            e.printStackTrace();
            Log.v("", "getbitmap bmp fail---");
            bitmap = null;
        }
        return bitmap;
    }

    /**
     * 将字符串转换成Bitmap类型
     *
     * @param
     * @return
     */
    public static Bitmap stringtoBitmap(String string) {
        Bitmap bitmap = null;
        try {
            byte[] bitmapArray;
            bitmapArray = Base64.decode(string, Base64.DEFAULT);
            bitmap = BitmapFactory.decodeByteArray(bitmapArray, 0, bitmapArray.length);
        } catch (Exception e) {
            e.printStackTrace();
        }

        return bitmap;
    }

    /**
     * 将Bitmap转换成字符串
     *
     * @param bitmap
     * @return
     */
    public static String bitmaptoString(Bitmap bitmap) {
        String string = null;
        ByteArrayOutputStream bStream = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.PNG, 100, bStream);
        byte[] bytes = bStream.toByteArray();
        string = Base64.encodeToString(bytes, Base64.DEFAULT);
        return string;
    }

    /**
     * 返回当前程序版本名-V2  三段修改---ex 5.2---5.21
     * support 7.8.8.1, 7.18.8.1, 17.18.8.1 modified by chenhong, 2018-5-25
     */
    public static String getAppVersionNameV2(Context context) {
        String versionCode = "";
        try {
            PackageInfo pi = MyApp.getAppContext().getPackageManager().getPackageInfo(MyApp.getAppContext().getPackageName(), 0);
            versionCode = pi.versionName;
        } catch (Exception e) {
            e.printStackTrace();
        }

        if (!TextUtils.isEmpty(versionCode)) {
            int firstDotIndex = versionCode.indexOf(".");
            if (firstDotIndex > -1) {
                String mainVersion = versionCode.substring(0, firstDotIndex);

                String subVersion = "";
                if (versionCode.length() > firstDotIndex + 1) {
                    subVersion = versionCode.substring(firstDotIndex + 1);
                    subVersion = subVersion.replace(".", "");
                }
                versionCode = mainVersion + "." + subVersion;

                int length = versionCode.length();
                int dotIndex = versionCode.indexOf(".");
                if (dotIndex == length - 1) {
                    versionCode += "00";
                } else if (dotIndex == length - 2) {
                    versionCode += "0";
                }
            } else {
                versionCode += ".00";
            }
        }
        return versionCode;
    }

    /**
     * 获取IP地址
     *
     * @param context
     * @return
     */
    public static String getIPAddress(Context context) {
        NetworkInfo info = ((ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE)).getActiveNetworkInfo();
        if (info != null && info.isConnected()) {
            if (info.getType() == ConnectivityManager.TYPE_MOBILE) {//当前使用2G/3G/4G网络
                try {
                    //Enumeration<NetworkInterface> en=NetworkInterface.getNetworkInterfaces();
                    for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements(); ) {
                        NetworkInterface intf = en.nextElement();
                        for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements(); ) {
                            InetAddress inetAddress = enumIpAddr.nextElement();
                            if (!inetAddress.isLoopbackAddress() && inetAddress instanceof Inet4Address) {
                                return inetAddress.getHostAddress();
                            }
                        }
                    }
                } catch (SocketException e) {
                    e.printStackTrace();
                }

            } else if (info.getType() == ConnectivityManager.TYPE_WIFI) {//当前使用无线网络
                WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
                WifiInfo wifiInfo = wifiManager.getConnectionInfo();
                String ipAddress = intIP2StringIP(wifiInfo.getIpAddress());//得到IPV4地址
                return ipAddress;
            }
        } else {
            //当前无网络连接,请在设置中打开网络
        }
        return null;
    }

    /**
     * 将得到的int类型的IP转换为String类型
     *
     * @param ip
     * @return
     */
    public static String intIP2StringIP(int ip) {
        return (ip & 0xFF) + "." +
                ((ip >> 8) & 0xFF) + "." +
                ((ip >> 16) & 0xFF) + "." +
                (ip >> 24 & 0xFF);
    }

    /**
     * 获取屏幕高度
     *
     * @param context
     * @return
     */
    public static int getWindowHeight(Context context) {
        WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        int windowHeight = wm.getDefaultDisplay().getHeight();
        return windowHeight;
    }

    /**
     * 获取屏幕宽度
     *
     * @param context
     * @return
     */
    public static int getWindowWidth(Context context) {
        WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        int windowWidth = wm.getDefaultDisplay().getWidth();
        return windowWidth;
    }

    /**
     * json字符串转map
     *
     * @param jsonString
     * @return
     */
    public static Map transStringToMap(String jsonString) {
        Gson gson = new Gson();
        Map<String, Object> map = new HashMap<String, Object>();
        map = gson.fromJson(jsonString, map.getClass());
        return map;
    }

    /**
     * 计算两个时间相隔多少天
     *
     * @return
     */
    public static String getDayNumberStr(String nowDate, String createDate) {
        String str = "";
        int strDay = 0;
        DateFormat df = new SimpleDateFormat("yyyy-MM-dd");
        try {
            Date d1 = df.parse(nowDate);
            Date d2 = df.parse(createDate);
            long diff = d1.getTime() - d2.getTime();//这样得到的差值是微秒级别
            long days = diff / (1000 * 60 * 60 * 24);
            long hours = (diff - days * (1000 * 60 * 60 * 24)) / (1000 * 60 * 60);
            long minutes = (diff - days * (1000 * 60 * 60 * 24) - hours * (1000 * 60 * 60)) / (1000 * 60);
//            System.out.println("" + days + "天" + hours + "小时" + minutes + "分");
            str = days + "";
            strDay = Integer.parseInt(str) + 1;
        } catch (Exception e) {
            e.printStackTrace();
        }

        return strDay + "";
    }

    /**
     * 获得当天0点时间
     */
    public static int getTimesmorning() {
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.MILLISECOND, 0);
        return (int) (cal.getTimeInMillis() / 1000);
    }

    /**
     * 获得当天24点时间
     */
    public static int getTimesnight() {
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.HOUR_OF_DAY, 24);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.MILLISECOND, 0);
        return (int) (cal.getTimeInMillis() / 1000);

    }

    /**
     * 获得当天时间
     */
    public static String getTodayDate() {
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");//设置日期格式
        String date = df.format(new Date());// new Date()为获取当前系统时间
        return date;
    }


    /**
     * 判断当前时间是否在时间date之前  date1 7点 date2 8点
     * 时间格式 2005-4-21 16:16:34   "yyyy-MM-dd HH:mm:ss"
     *
     * @param date
     * @return
     * @throws ParseException
     */
    public static boolean isDateBefore(String date) throws ParseException {
        Date date1 = new Date();//当前时间
        DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        return date1.before(df.parse(date));
    }

    /**
     * 判断当前时间是否在时间date之后   date1 8点 date2 5点
     *
     * @param date
     * @return
     * @throws ParseException
     */
    public static boolean isDateAfter(String date) throws ParseException {
        Date date1 = new Date();//当前时间
        DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        return (df.parse(date)).before(date1);
    }

    /**
     * 大小写转换
     *
     * @param UpperCasestr
     * @return
     * @throws Exception
     */
    public static String toUpperCase(String UpperCasestr) throws Exception {
        return UpperCasestr.toUpperCase().toString();
    }

    /**
     * 去除字符串空格
     *
     * @return
     */
    public static String removeAllSpace(String str) {
        String tmpstr = str.replace(" ", "");
        return tmpstr;
    }

    /**
     * 获取当前网络类型
     *
     * @return
     */
    public static String getNetworkTypeAll() {
        String strNetworkType = "";
        ConnectivityManager cm = (ConnectivityManager) MyApp.mContext.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = cm.getActiveNetworkInfo();
        if (networkInfo != null && networkInfo.isConnected()) {
            if (networkInfo.getType() == ConnectivityManager.TYPE_WIFI) {
                strNetworkType = "WIFI";
            } else if (networkInfo.getType() == ConnectivityManager.TYPE_MOBILE) {
                String _strSubTypeName = networkInfo.getSubtypeName();

                // TD-SCDMA   networkType is 17
                int networkType = networkInfo.getSubtype();
                switch (networkType) {
                    case TelephonyManager.NETWORK_TYPE_GPRS:
                    case TelephonyManager.NETWORK_TYPE_EDGE:
                    case TelephonyManager.NETWORK_TYPE_CDMA:
                    case TelephonyManager.NETWORK_TYPE_1xRTT:
                    case TelephonyManager.NETWORK_TYPE_IDEN: //api<8 : replace by 11
                        strNetworkType = "2G";
                        break;
                    case TelephonyManager.NETWORK_TYPE_UMTS:
                    case TelephonyManager.NETWORK_TYPE_EVDO_0:
                    case TelephonyManager.NETWORK_TYPE_EVDO_A:
                    case TelephonyManager.NETWORK_TYPE_HSDPA:
                    case TelephonyManager.NETWORK_TYPE_HSUPA:
                    case TelephonyManager.NETWORK_TYPE_HSPA:
                    case TelephonyManager.NETWORK_TYPE_EVDO_B: //api<9 : replace by 14
                    case TelephonyManager.NETWORK_TYPE_EHRPD:  //api<11 : replace by 12
                    case TelephonyManager.NETWORK_TYPE_HSPAP:  //api<13 : replace by 15
                        strNetworkType = "3G";
                        break;
                    case TelephonyManager.NETWORK_TYPE_LTE:    //api<11 : replace by 13
                        strNetworkType = "4G";
                        break;
                    default:
                        if (_strSubTypeName.equalsIgnoreCase("TD-SCDMA") || _strSubTypeName.equalsIgnoreCase("WCDMA") || _strSubTypeName.equalsIgnoreCase("CDMA2000")) {
                            strNetworkType = "3G";
                        } else {
                            strNetworkType = _strSubTypeName;
                        }
                        break;
                }
            }
        }
        return strNetworkType;
    }


    /**
     * 获取sim卡运营商信息
     */
    public static String getSimOperator() {
        String operator = "";
        try {
            TelephonyManager telManager = (TelephonyManager) MyApp.mContext.getSystemService(Context.TELEPHONY_SERVICE);
            operator = telManager.getSimOperator();
            if (operator != null) {
                if (operator.equals("46000") || operator.equals("46002") || operator.equals("46007")) {
                    operator = "中国移动";
                } else if (operator.equals("46001")) {
                    operator = "中国联通";
                } else if (operator.equals("46003")) {
                    operator = "中国电信";
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
            return operator;
        }
        return operator;
    }
    
/**
     * 强制隐藏输入法键盘
     *
     * @param context Context
     * @param view    EditText
     */
    public void hideInput(Context context, View view) {
        InputMethodManager inputMethodManager = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
        inputMethodManager.hideSoftInputFromWindow(view.getWindowToken(), 0);
    }