Android中Helper帮助类
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package com.huaiye.ecs.common.utils;import android.app.Activity;import android.app.ActivityManager;import android.content.ComponentName;import android.content.Context;import android.content.Intent;import android.content.pm.ApplicationInfo;import android.content.pm.PackageInfo;import android.content.pm.PackageManager;import android.content.pm.Signature;import android.content.res.AssetManager;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Rect;import android.graphics.drawable.Drawable;import android.net.ConnectivityManager;import android.net.NetworkInfo;import android.net.wifi.WifiInfo;import android.net.wifi.WifiManager;import android.os.Build;import android.os.Environment;import android.os.PowerManager;import android.telephony.TelephonyManager;import android.text.TextUtils;import android.view.View;import android.view.animation.Animation;import android.view.animation.AnimationUtils;import android.view.inputmethod.InputMethodManager;import android.widget.EditText;import java.io.ByteArrayInputStream;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.LineNumberReader;import java.net.Inet4Address;import java.net.InetAddress;import java.net.NetworkInterface;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;import java.security.cert.CertificateException;import java.security.cert.CertificateFactory;import java.security.cert.X509Certificate;import java.util.Enumeration;import java.util.List;import java.util.UUID;import javax.net.ssl.HttpsURLConnection;import javax.net.ssl.SSLContext;import javax.net.ssl.TrustManager;import javax.net.ssl.X509TrustManager;/** * ****************************** * @文件名称:KukiHelper.java * @文件作者:Administrator * @创建时间:2015年7月4日 * @文件描述:ccc * ***************************** */public class Helper { static Context context = App.getInstance(); private Helper() { } // sp convert to px public static int sp2px(int spValue) { float scaledDensity = context.getResources().getDisplayMetrics().scaledDensity; int pxValue = (int) (spValue * scaledDensity + 0.5f); return pxValue; } // px convert to sp public static int px2sp(int pxValue) { float scaledDensity = context.getResources().getDisplayMetrics().scaledDensity; int spValue = (int) (pxValue / scaledDensity + 0.5f); return spValue; } // dp convert to px public static int dp2px(int dpValue) { float density = context.getResources().getDisplayMetrics().density; int pxValue = (int) (dpValue * density + 0.5f); return pxValue; } // px convert to dp public static int px2dp(int pxValue) { float scaledDensity = context.getResources().getDisplayMetrics().scaledDensity; int dpValue = (int) (pxValue * scaledDensity + 0.5f); return dpValue; } // findView public static <T extends View> T findViewById(View rootView, int id) { View target = rootView.findViewById(id); return (T) target; } // findView public static <T extends View> T findViewById(Activity ac, int id) { View target = ac.findViewById(id); return (T) target; } // 获取包名 public static String packageName() { String name = context.getPackageName(); return name; } // 获取版本号 public static int versionCode() { int version = -1; try { String packageName = packageName(); PackageManager packageManager = context.getPackageManager(); PackageInfo packageInfo = packageManager.getPackageInfo(packageName, 0); version = packageInfo.versionCode; } catch (PackageManager.NameNotFoundException e) { e.printStackTrace(); } return version; } // 获取版本名称 public static String versionName() { String versionCode = null; try { String packageName = packageName(); PackageManager packageManager = context.getPackageManager(); PackageInfo packageInfo = packageManager.getPackageInfo(packageName, 0); versionCode = packageInfo.versionName; } catch (PackageManager.NameNotFoundException e) { e.printStackTrace(); } return versionCode; } // 获取xml中配置的String 值 public static String getStringResource(int id) { return context.getResources().getString(id); } // 获取xml中的Color 色值 public static int getColorResource(int id) { return context.getResources().getColor(id); } // 获取xml中的Integer 值 public static int getIntegerResource(int id) { return context.getResources().getInteger(id); } // 获取xml中的String数组 public static String[] getStringArrayResource(int id) { return context.getResources().getStringArray(id); } // 获取Assets下的资源输入流 public static InputStream getAssetsResource(String filename) { try { return context.getAssets().open(filename); } catch (IOException e) { e.printStackTrace(); } return null; } // 获取Assets下的String资源 public static String getAssetString(String name) { String string = ""; AssetManager asset = context.getAssets(); try { InputStream input = asset.open(name); byte[] buffer = new byte[input.available()]; input.read(buffer); input.close(); string = new String(buffer, "utf-8"); } catch (IOException e) { e.printStackTrace(); } return string; } // 获取assets下的Bitmap文件 public static Bitmap getAssetBitmap(String name) { InputStream is = getAssetsResource(name); if (is != null) { Bitmap bm = BitmapFactory.decodeStream(is); return bm; } return null; } // 获取Raw下的资源输入流 public static InputStream getRawResource(int id) { return context.getResources().openRawResource(id); } // 获取xml中的Integer数组 public static int[] getIntegerArrayResource(int id) { return context.getResources().getIntArray(id); } // 获取Drawable public static Drawable getDrawable(int id) { return context.getResources().getDrawable(id); } // 获取Animations public static Animation getAnimation(int id) { return AnimationUtils.loadAnimation(context, id); } // 窗口宽度 public static int getScreenWidth() { return context.getResources().getDisplayMetrics().widthPixels; } // 窗口高度 public static int getScreenHeight() { return context.getResources().getDisplayMetrics().heightPixels; } // IMEI public static String getIMEI() { String imei = ((TelephonyManager) context .getApplicationContext() .getSystemService(Context.TELEPHONY_SERVICE)).getDeviceId(); return imei; } // IMSI public static String getIMSI() { String imsi = ((TelephonyManager) context.getApplicationContext().getSystemService(Context.TELEPHONY_SERVICE)).getSubscriberId(); return imsi; } public static String getDeviceUniqueId(){ String serial = null; String m_szDevIDShort = "35" + Build.BOARD.length()%10+ Build.BRAND.length()%10 + Build.CPU_ABI.length()%10 + Build.DEVICE.length()%10 + Build.DISPLAY.length()%10 + Build.HOST.length()%10 + Build.ID.length()%10 + Build.MANUFACTURER.length()%10 + Build.MODEL.length()%10 + Build.PRODUCT.length()%10 + Build.TAGS.length()%10 + Build.TYPE.length()%10 + Build.USER.length()%10 ; //13 位 try { serial = Build.class.getField("SERIAL").get(null).toString(); //API>=9 使用serial号 return new UUID(m_szDevIDShort.hashCode(), serial.hashCode()).toString(); } catch (Exception exception) { //serial需要一个初始化 serial = "serial"; // 随便一个初始化 } //使用硬件信息拼凑出来的15位号码 return new UUID(m_szDevIDShort.hashCode(), serial.hashCode()).toString(); } // 设备型号 public static String getModel() { return Build.MODEL; } // 设备制造商 public static String getManufacturer() { return Build.MANUFACTURER; } /** * 获得状态栏的高度 */ public static int getStatusHeight() { int statusHeight = -1; try { Class<?> clazz = Class.forName("com.android.internal.R$dimen"); Object object = clazz.newInstance(); int height = Integer.parseInt(clazz.getField("status_bar_height") .get(object).toString()); statusHeight = context.getResources().getDimensionPixelSize(height); } catch (Exception e) { e.printStackTrace(); } return statusHeight; } /** * 获取当前屏幕截图，包含状态栏 */ public static Bitmap snapShotWithStatusBar(Activity activity) { View view = activity.getWindow().getDecorView(); view.setDrawingCacheEnabled(true); view.buildDrawingCache(); Bitmap bmp = view.getDrawingCache(); int width = getScreenWidth(); int height = getScreenHeight(); Bitmap bp = null; bp = Bitmap.createBitmap(bmp, 0, 0, width, height); view.destroyDrawingCache(); return bp; } /** * 获取状态栏高度 * * @return */ public static int statusHeight(Activity activity) { Rect frame = new Rect(); activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame); int statusBarHeight = frame.top; return statusBarHeight; } /** * 获取当前屏幕截图，不包含状态栏 */ public static Bitmap snapShotWithoutStatusBar(Activity activity) { View view = activity.getWindow().getDecorView(); view.setDrawingCacheEnabled(true); view.buildDrawingCache(); Bitmap bmp = view.getDrawingCache(); Rect frame = new Rect(); activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame); int statusBarHeight = frame.top; int width = getScreenWidth(); int height = getScreenHeight(); Bitmap bp = null; bp = Bitmap.createBitmap(bmp, 0, statusBarHeight, width, height - statusBarHeight); view.destroyDrawingCache(); return bp; } // 系统版本名 public static String getOsReleaseVersion() { return Build.VERSION.RELEASE; } // 系统SDK版本 public static int getOsSdkVersion() { return Build.VERSION.SDK_INT; } // 获取 uuid public static String getUUid() { String uuidString = UUID.randomUUID().toString(); return uuidString; } // Application <meta-data> 元素 key为name 获取对应的value public static <T> T getAppMetaData(String name) { ApplicationInfo appInfo; try { appInfo = context.getPackageManager().getApplicationInfo( context.getPackageName(), PackageManager.GET_META_DATA); } catch (PackageManager.NameNotFoundException e) { e.printStackTrace(); return null; } if (appInfo.metaData != null && appInfo.metaData.containsKey(name)) { return (T) appInfo.metaData.get(name); } return null; } /** * 获取系统安装的所有App的包信息 * @return */ public static List<PackageInfo> getInstalledPackages(){ PackageManager pm = context.getPackageManager(); return pm.getInstalledPackages(0); } /** * 判断App是否是系统安装的 * @param pi * @return */ public static boolean isAppSystemInstalled(PackageInfo pi){ if((pi.applicationInfo.flags& ApplicationInfo.FLAG_SYSTEM)==0&& (pi.applicationInfo.flags&ApplicationInfo.FLAG_UPDATED_SYSTEM_APP)==0){ return false; }else { return true; } } /** * 获取应用程序名称 */ public static String getAppName() {// 第一种方案// try {// PackageManager packageManager = context.getPackageManager();// PackageInfo packageInfo = packageManager.getPackageInfo(// context.getPackageName(), 0);// int labelRes = packageInfo.applicationInfo.labelRes;// return context.getResources().getString(labelRes);// } catch (PackageManager.NameNotFoundException e) {// e.printStackTrace();// } PackageManager packageManager = context.getPackageManager(); return packageManager.getApplicationLabel(context.getApplicationInfo()).toString(); } // 一个获得当前进程的名字的方法 public static String getCurrentProcessName() { int pid = android.os.Process.myPid(); ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE); for (ActivityManager.RunningAppProcessInfo appProcess : activityManager.getRunningAppProcesses()) { if (appProcess.pid == pid) { return appProcess.processName; } } return null; } /** * 使用SSL不信任的证书 * 默认设置的是HttpsURLConnection的 */ public static void useUntrustedCertificate() { // Create a trust manager that does not validate certificate chains TrustManager[] trustAllCerts = new TrustManager[]{ new X509TrustManager() { public X509Certificate[] getAcceptedIssuers() { return null; } public void checkClientTrusted( X509Certificate[] certs, String authType) { } public void checkServerTrusted( X509Certificate[] certs, String authType) { } } }; // Install the all-trusting trust manager try { SSLContext sc = SSLContext.getInstance("SSL"); sc.init(null, trustAllCerts, new java.security.SecureRandom()); HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory()); } catch (Exception e) { e.printStackTrace(); } } /** * 打开软键盘 */ public static void openKeyboard(EditText mEditText) { InputMethodManager imm = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE); imm.showSoftInput(mEditText, InputMethodManager.RESULT_SHOWN); imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, InputMethodManager.HIDE_IMPLICIT_ONLY); } /** * 关闭软键盘 */ public static void closeKeyboard(EditText mEditText) { InputMethodManager imm = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE); imm.hideSoftInputFromWindow(mEditText.getWindowToken(), 0); } // mac地址 // 需要权限 ACCESS_WIFI_STATE public static String getLocalMacAddress() { String macSerial = null; String str = ""; try { Process pp = Runtime.getRuntime().exec("cat /sys/class/net/wlan0/address "); InputStreamReader ir = new InputStreamReader(pp.getInputStream()); LineNumberReader input = new LineNumberReader(ir); for (; null != str; ) { str = input.readLine(); if (str != null) { macSerial = str.trim();// 去空格 break; } } } catch (IOException ex) { // 赋予默认值 ex.printStackTrace(); } if(TextUtils.isEmpty(macSerial)){ macSerial = ((TelephonyManager) context .getApplicationContext() .getSystemService(Context.TELEPHONY_SERVICE)).getDeviceId(); } if(TextUtils.isEmpty(macSerial)){ String serial = null; String m_szDevIDShort = "35" + Build.BOARD.length()%10+ Build.BRAND.length()%10 + Build.CPU_ABI.length()%10 + Build.DEVICE.length()%10 + Build.DISPLAY.length()%10 + Build.HOST.length()%10 + Build.ID.length()%10 + Build.MANUFACTURER.length()%10 + Build.MODEL.length()%10 + Build.PRODUCT.length()%10 + Build.TAGS.length()%10 + Build.TYPE.length()%10 + Build.USER.length()%10 ; //13 位 try { serial = android.os.Build.class.getField("SERIAL").get(null).toString(); //API>=9 使用serial号 return new UUID(m_szDevIDShort.hashCode(), serial.hashCode()).toString(); } catch (Exception exception) { //serial需要一个初始化 serial = "serial"; // 随便一个初始化 } //使用硬件信息拼凑出来的15位号码 macSerial = new UUID(m_szDevIDShort.hashCode(), serial.hashCode()).toString(); } return macSerial; } /** * sdcard是否可用 * * @return */ public static boolean isSDCardUseful() { return Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED); } /** * 当前App是否处于前台 * 在onResume/onStop中判断 * onStop是Activity回到后台后的最后一个生命周期方法 * * @return */ public static boolean isAppForeground() {// 方法的原型// ActivityManager activityManager = (ActivityManager) getApplicationContext().getSystemService(Context.ACTIVITY_SERVICE);// String packageName = getApplicationContext().getPackageName();//// List<ActivityManager.RunningAppProcessInfo> appProcesses = activityManager// .getRunningAppProcesses();// if (appProcesses == null)// return false;//// for (ActivityManager.RunningAppProcessInfo appProcess : appProcesses) {// // 进程名称是否与包名一致// // 这种方法判断有误差，如果App启动的所在线程是一个附属线程，在附属线程中判断的话，进程名永远都会与包名一致// if (appProcess.processName.equals(packageName)// && appProcess.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {// return true;// }// }// 废弃方法+// /**// * android.permission.GET_TASKS// * 之前，使用该接口需要 android.permission.GET_TASKS// * 即使是自己开发的普通应用，只要声明该权限，即可以使用getRunningTasks接口。// * 但从L开始，这种方式以及废弃。// * 应用要使用该接口必须声明权限android.permission.REAL_GET_TASKS// * 而这个权限是不对三方应用开放的。（在Manifest里申请了也没有作用）// * 系统应用（有系统签名）可以调用该权限。// * 该方法废弃// */// ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);// List<ActivityManager.RunningTaskInfo> tasks = am.getRunningTasks(1);// if (tasks != null && !tasks.isEmpty()) {// ActivityManager.RunningTaskInfo topTask = tasks.get(0);// ComponentName topTaskInfo = topTask.topActivity;// Log.d("hjq", "top pkg " + topTaskInfo.getPackageName());// if (topTaskInfo.getPackageName().equals(context.getPackageName())) {// return true;// }// } // 获取当前的进程号 int pid = android.os.Process.myPid(); ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE); List<ActivityManager.RunningAppProcessInfo> processInfos = am.getRunningAppProcesses(); if (processInfos != null && !processInfos.isEmpty()) { for (ActivityManager.RunningAppProcessInfo tmp : processInfos) { if (tmp.pid == pid) { // 判断该进程是否属于前台进程 if (tmp.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) { return true; } else { return false; } } } } return false; } /** * 判断屏幕是否被点亮 * @return */ public static boolean isScreenOn(){ PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE); boolean isScreenOn = pm.isScreenOn(); return isScreenOn; } /** * 重新启动App * * @param context */ public static void restartApplication(Context context) { PackageManager pm = context.getPackageManager(); Intent intent = pm.getLaunchIntentForPackage(context.getPackageName()); intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); context.startActivity(intent); } /** * 网络相关的工具方法 */ public static class NetWork { /** * 判断网络是否可用 * * @return */ public static boolean isNetworkAvailable() { /* * mNetworkInfo.isAvailable() mNetworkInfo.isConnected() 函数返回 * 1，显示连接已保存，但标题栏没有，即没有实质连接上 not connect， available * * 2，显示连接已保存，标题栏也有已连接上的图标， connect， available * * 3，选择不保存后 not connect， available * * 4，选择连接，在正在获取IP地址时 not connect， not available * avalibale更可靠用来判断网络是否可用 */ if (context != null) { ConnectivityManager mConnectivityManager = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo(); if (mNetworkInfo != null) { return mNetworkInfo.isAvailable(); } } return false; } /** * 判断WIFI网络是否可用 * * @return */ public static boolean isWifiConnected() { if (context != null) { ConnectivityManager mConnectivityManager = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo mWiFiNetworkInfo = mConnectivityManager .getNetworkInfo(ConnectivityManager.TYPE_WIFI); if (mWiFiNetworkInfo != null) { return mWiFiNetworkInfo.isAvailable(); } } return false; } /** * 判断MOBILE网络是否可用 * * @return */ public static boolean isMobileConnected() { if (context != null) { ConnectivityManager mConnectivityManager = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo mMobileNetworkInfo = mConnectivityManager .getNetworkInfo(ConnectivityManager.TYPE_MOBILE); if (mMobileNetworkInfo != null) { return mMobileNetworkInfo.isAvailable(); } } return false; } /** * 获取当前的网络状态 ：没有网络0：WIFI网络1：3G网络2：2G网络3 * * @return */ public static int getNetworkType() { int netType = 0; ConnectivityManager connMgr = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo networkInfo = connMgr.getActiveNetworkInfo(); if (networkInfo == null) { return netType; } int nType = networkInfo.getType(); if (nType == ConnectivityManager.TYPE_WIFI) { netType = 1;// wifi } else if (nType == ConnectivityManager.TYPE_MOBILE) { int nSubType = networkInfo.getSubtype(); TelephonyManager mTelephony = (TelephonyManager) context .getSystemService(Context.TELEPHONY_SERVICE); if (nSubType == TelephonyManager.NETWORK_TYPE_UMTS && !mTelephony.isNetworkRoaming()) { netType = 2;// 3G } else { netType = 3;// 2G } } return netType; } /** * 打开无线网络设置界面 */ public static void openWirelessSettings() { Intent intent = new Intent("/"); ComponentName cm = new ComponentName("com.android.settings", "com.android.settings.WirelessSettings"); intent.setComponent(cm); intent.setAction("android.intent.action.VIEW"); context.startActivity(intent); } /** * mac地址 * android.permission.ACCESS_WIFI_STATE */ public static String getMacAddress() { String macSerial = null; String str = ""; try { Process pp = Runtime.getRuntime().exec("cat /sys/class/net/wlan0/address "); InputStreamReader ir = new InputStreamReader(pp.getInputStream()); LineNumberReader input = new LineNumberReader(ir); for (; null != str; ) { str = input.readLine(); if (str != null) { macSerial = str.trim();// 去空格 break; } } } catch (IOException ex) { // 赋予默认值 ex.printStackTrace(); } return macSerial; } /** * 获取IP地址,只有WIFI条件下可用 * * @return */ public static String getMobileIP() { // 优先从WIFI获取IP地址 String ip = ipFromWifi(); // 若Wifi获取不到或者Wifi没有开，那么通过网络接口获取IP地址 if (TextUtils.isEmpty(ip)) { return ipFromInternet(); } return ip; } /** * 通过WIFI获取IP地址 * * @return */ private static String ipFromWifi() { //获取wifi服务 WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE); //判断wifi是否开启 if (!wifiManager.isWifiEnabled()) { return null; } WifiInfo wifiInfo = wifiManager.getConnectionInfo(); int ipAddress = wifiInfo.getIpAddress(); // 地址转换 return (ipAddress & 0xFF) + "." + ((ipAddress >> 8) & 0xFF) + "." + ((ipAddress >> 16) & 0xFF) + "." + (ipAddress >> 24 & 0xFF); } /** * 通过Internet获取IP地址，需要Internet网络权限 * android.permission.INTERNET * * @return */ private static String ipFromInternet() { try { 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) { // 取IPV4地址 // if (!inetAddress.isLoopbackAddress() && inetAddress // instanceof Inet6Address) { return inetAddress.getHostAddress().toString(); } } } } catch (Exception e) { e.printStackTrace(); } return null; } } /** * App签名 sha1相关 */ public static class AppSig { /** * 获取App签名 * * @return */ public static String getAppSignature() { try { PackageManager packageManager = context.getPackageManager(); //请注意需要PackageManager.GET_SIGNATURES 这个flag PackageInfo packageInfo = packageManager.getPackageInfo(context.getPackageName(), PackageManager.GET_SIGNATURES); Signature[] signs = packageInfo.signatures; Signature sign = signs[0]; // X509证书，X.509是一种非常通用的证书格式 CertificateFactory certFactory = CertificateFactory.getInstance("X.509"); X509Certificate cert = (X509Certificate) certFactory .generateCertificate(new ByteArrayInputStream(sign.toByteArray())); // md5 MessageDigest md = MessageDigest.getInstance("MD5"); // 获得公钥 byte[] b = md.digest(cert.getEncoded()); //key即为应用签名 //.replace(":", ""); String key = byte2HexFormatted(b); return key; } catch (PackageManager.NameNotFoundException e) { e.printStackTrace(); } catch (CertificateException e) { e.printStackTrace(); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } return null; } /** * 获得app 的sha1值 * * @return */ public static String getAppSignSha1() { try { PackageManager packageManager = context.getPackageManager(); PackageInfo packageInfo = packageManager.getPackageInfo(context.getPackageName(), PackageManager.GET_SIGNATURES); // X509证书，X.509是一种非常通用的证书格式 Signature[] signs = packageInfo.signatures; Signature sign = signs[0]; CertificateFactory certFactory = CertificateFactory.getInstance("X.509"); X509Certificate cert = (X509Certificate) certFactory.generateCertificate(new ByteArrayInputStream(sign.toByteArray())); // md5 MessageDigest md = MessageDigest.getInstance("SHA1"); // 获得公钥 byte[] b = md.digest(cert.getEncoded()); return byte2HexFormatted(b); } catch (Exception e) { e.printStackTrace(); } return null; } /** * 将获取到得编码进行16进制转换 * * @param arr * @return */ private static String byte2HexFormatted(byte[] arr) { StringBuilder str = new StringBuilder(arr.length * 2); for (int i = 0; i < arr.length; i++) { String h = Integer.toHexString(arr[i]); int l = h.length(); if (l == 1) h = "0" + h; if (l > 2) h = h.substring(l - 2, l); str.append(h.toUpperCase()); if (i < (arr.length - 1)) str.append(':'); } return str.toString(); } }}
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