Java tutorial
/*Copyright (C) 2012 Crow Hou (crow_hou@126.com) Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.*/ package crow.util; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.io.UnsupportedEncodingException; import java.math.BigInteger; import java.net.HttpURLConnection; import java.net.URL; import java.net.URLConnection; import java.net.URLEncoder; import java.security.MessageDigest; import java.util.Collections; import java.util.List; import org.apache.http.protocol.HTTP; import android.content.Context; import android.content.pm.ApplicationInfo; import android.content.pm.PackageManager; import android.content.res.AssetManager; import android.net.ConnectivityManager; import android.net.NetworkInfo; import android.os.Build; import android.os.Bundle; import android.provider.Settings; import android.provider.Settings.Secure; import android.telephony.TelephonyManager; /** * Yek * * @author crow * */ public class Util { /** * {@code md5} * * @param str * {@code md5} * @return md5() null str md5? */ public static String md5(String str) { MessageDigest messageDigest = null; String digest = null; if ((str != null) && (str.length() > 0)) { try { (messageDigest = MessageDigest.getInstance("MD5")).update(str.getBytes()); digest = String.format("%032X", new Object[] { new BigInteger(1, (messageDigest).digest()) }); } catch (Exception e) { digest = str.substring(0, 32); } } return digest; } /** * ??? * * @return true ? false ? */ public static boolean isEmulator() { return ("unknown".equals(Build.BOARD)) && ("generic".equals(Build.DEVICE)) && ("generic".equals(Build.BRAND)); } /** * ?? ?? android_id * * @param context * @return null ? ???0 */ public static String getDeviceId(Context context) { TelephonyManager telManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE); String imei = telManager.getDeviceId(); if (imei != null) { return imei; } String dv = null; if ((dv = Settings.Secure.getString(context.getContentResolver(), Secure.ANDROID_ID)) != null) { dv = md5(dv).toUpperCase(); } return dv; } // public static String getUUID(Context context) { // final TelephonyManager tm = (TelephonyManager) context // .getSystemService(Context.TELEPHONY_SERVICE); // final String tmDevice, tmSerial, androidId; // tmDevice = "" + tm.getDeviceId(); // tmSerial = "" + tm.getSimSerialNumber(); // androidId = "" // + android.provider.Settings.Secure.getString(context // .getContentResolver(), // // android.provider.Settings.Secure.ANDROID_ID); // // UUID deviceUuid = new UUID(androidId.hashCode(), ((long) tmDevice // .hashCode() << 32) // | tmSerial.hashCode()); // String uniqueId = deviceUuid.toString(); // return uniqueId; // } /** * ? meta <code> * <meta-data android:name="keyName" * android:value="0123456789abc" /> * </code> * * @param context * @param keyName * name of meta-data * @return value of meta-data null ? */ public static String readMetaByKey(Context context, String keyName) { try { ApplicationInfo appi = context.getPackageManager().getApplicationInfo(context.getPackageName(), PackageManager.GET_META_DATA); Bundle bundle = appi.metaData; return (String) bundle.get(keyName); } catch (Exception e) { return null; } } // private static String userAgent; // // /** // * ??URL UserAgent // */ // public static String getUserAgent(Context context) { // if (userAgent == null) { // String ua = new WebView(context).getSettings().getUserAgentString(); // if ((ua == null) || (ua.length() == 0) || (ua.equals("Java0"))) { // String osName = System.getProperty("os.name", "Linux"); // String osVersion = "Android " + Build.VERSION.RELEASE; // Locale locale = Locale.getDefault(); // String lang = locale.getLanguage().toLowerCase(); // if (lang.length() == 0) // lang = "en"; // String country = locale.getCountry().toLowerCase(); // if (country.length() > 0) // lang = lang + "-" + country; // String build = Build.MODEL + " Build/" + Build.ID; // ua = "Mozilla/5.0 (" + osName + "; U; " + osVersion + "; " // + lang + "; " + build // + ") AppleWebKit/0.0 (KHTML, like " // + "Gecko) Version/0.0 Mobile Safari/0.0"; // } // userAgent = ua; // } // return userAgent; // } // // public static void setUserAgent(WebView webView) { // String ua = getUserAgent(webView.getContext().getApplicationContext()); // webView.getSettings().setUserAgentString(ua); // } // // public static void setUserAgent(HttpURLConnection uRLConnection, // Context context) { // uRLConnection.setRequestProperty("User-Agent", getUserAgent(context)); // } /** * ? * <ul> * <li>Util.isEmpty(null) = true</li> * <li>Util.isEmpty("") = true</li> * <li>Util.isEmpty(" ") = true</li> * <li>Util.isEmpty("abc") = false</li> * </ul> * * @param value * * @return true/false */ public static boolean isEmpty(String value) { int strLen; if (value == null || (strLen = value.length()) == 0) { return true; } for (int i = 0; i < strLen; i++) { if ((Character.isWhitespace(value.charAt(i)) == false)) { return false; } } return true; } /** * ???? ?manifest ?? <uses-permission * android:name="android.permission.READ_PHONE_STATE"> * * @param context * @return "" / "?" / "" / "" */ public static String getCarrier(Context context) { TelephonyManager telManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE); String imsi = telManager.getSubscriberId(); if (imsi != null && !"".equals(imsi)) { if (imsi.startsWith("46000") || imsi.startsWith("46002")) {// ?46000IMSI?46002?134/159?? return ""; } else if (imsi.startsWith("46001")) { return "?"; } else if (imsi.startsWith("46003")) { return ""; } } return ""; } /** * ?? * * @param context * @return {@code true} ? {@code false} ?? */ public static boolean canAccessNetwork(Context context) { ConnectivityManager connManager = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); if (connManager.getActiveNetworkInfo() != null && connManager.getActiveNetworkInfo().isAvailable()) { return true; } return false; } /** * ??wifi * * @param context * @return true ?wifi false */ public static boolean isWifi(Context context) { ConnectivityManager connManager = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo netInfo = connManager.getActiveNetworkInfo(); if (netInfo != null) { int type = netInfo.getType(); if (type == ConnectivityManager.TYPE_WIFI) { return true; } } return false; } public static String encode(String s) { if (s == null) { return ""; } try { return URLEncoder.encode(s, "UTF-8").replace("+", "%20").replace("*", "%2A").replace("%7E", "~") .replace("#", "%23"); } catch (UnsupportedEncodingException e) { throw new RuntimeException(e.getMessage(), e); } } /** * ?? * * @param postParams * @param splitter * @param quot * @return */ public static String encodeParameters(List<PostParameter> postParams, String splitter, boolean quot) { StringBuffer buf = new StringBuffer(); for (PostParameter param : postParams) { if (buf.length() != 0) { if (quot) { buf.append("\""); } buf.append(splitter); } buf.append(encode(param.getName())).append("="); if (quot) { buf.append("\""); } buf.append(encode(param.getValue())); } if (buf.length() != 0) { if (quot) { buf.append("\""); } } return buf.toString(); } /** * md5???? N1=Value1,N2=Value2 secret splitter <br/> * * sign = md5(N1splitterValue1N2splitterValue2secret) * * @param params * ???? * @param secret * ?? * @param splitter * ???Value * @return */ public static String md5Sign(List<PostParameter> params, String secret, String splitter) { Collections.sort(params); splitter = splitter == null ? "" : splitter; StringBuilder buffer = new StringBuilder(); for (PostParameter param : params) { buffer.append(param.getName()).append(splitter).append(param.getValue()); } buffer.append(secret); return md5(buffer.toString()); } public static String urlGet(String url) throws IOException { URLConnection conn = new URL(url).openConnection(); conn.setConnectTimeout(20000); InputStream input = conn.getInputStream(); String result = inputStreamToString(input); return result; } public static String urlPost(String url, String encodePostParam) throws IOException { HttpURLConnection conn = null; conn = (HttpURLConnection) new URL(url).openConnection(); return urlPost(conn, encodePostParam); } public static String urlPost(HttpURLConnection conn, String encodePostParam) throws IOException { int responseCode = -1; OutputStream osw = null; try { conn.setConnectTimeout(20000); conn.setReadTimeout(12000); conn.setDoInput(true); conn.setRequestMethod("POST"); conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); conn.setDoOutput(true); byte[] bytes = encodePostParam.getBytes("UTF-8"); conn.setRequestProperty("Content-Length", Integer.toString(bytes.length)); osw = conn.getOutputStream(); osw.write(bytes); osw.flush(); responseCode = conn.getResponseCode(); if (responseCode != HttpURLConnection.HTTP_OK) { throw new IOException(""); } else { String s = inputStreamToString(conn.getInputStream()); return s; } } finally { try { if (osw != null) osw.close(); } catch (Exception ignore) { } } } /** * inputStream UTF-8?? * */ public static String inputStreamToString(InputStream is) throws IOException { ByteArrayOutputStream out = new ByteArrayOutputStream(); byte arr[] = new byte[32]; int len = 0; try { while ((len = is.read(arr)) != -1) { out.write(arr, 0, len); } } finally { try { is.close(); out.close(); } catch (IOException e) { // do nothing } } return out.toString(HTTP.UTF_8); } /** * Assists ? */ public static String getAssistFileAsString(Context context, String assistFile) throws IOException { String result = null; AssetManager assetManager = context.getAssets(); result = inputStreamToString(assetManager.open(assistFile)); return result; } }