Java tutorial
/* * Copyright (c) 2013. wyouflf (wyouflf@gmail.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 com.lidroid.xutils.utils; import java.io.File; import java.io.UnsupportedEncodingException; import java.lang.reflect.Field; import java.nio.charset.Charset; import java.security.cert.X509Certificate; import java.util.Locale; import javax.net.ssl.HttpsURLConnection; import javax.net.ssl.SSLContext; import javax.net.ssl.SSLSocketFactory; import javax.net.ssl.TrustManager; import javax.net.ssl.X509TrustManager; import org.apache.http.Header; import org.apache.http.HeaderElement; import org.apache.http.HttpResponse; import org.apache.http.NameValuePair; import org.apache.http.client.methods.HttpRequestBase; import org.apache.http.protocol.HTTP; import android.annotation.SuppressLint; import android.content.Context; import android.os.Build; import android.os.Environment; import android.os.StatFs; import android.text.TextUtils; /** * Created by wyouflf on 13-8-30. */ public class OtherUtils { private OtherUtils() { } /** * @param context if null, use the default format * (Mozilla/5.0 (Linux; U; Android %s) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 %sSafari/534.30). * @return */ @SuppressLint("DefaultLocale") public static String getUserAgent(Context context) { String webUserAgent = null; if (context != null) { try { Class<?> sysResCls = Class.forName("com.android.internal.R$string"); Field webUserAgentField = sysResCls.getDeclaredField("web_user_agent"); Integer resId = (Integer) webUserAgentField.get(null); webUserAgent = context.getString(resId); } catch (Throwable ignored) { } } if (TextUtils.isEmpty(webUserAgent)) { webUserAgent = "Mozilla/5.0 (Linux; U; Android %s) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 %sSafari/533.1"; } Locale locale = Locale.getDefault(); StringBuffer buffer = new StringBuffer(); // Add version final String version = Build.VERSION.RELEASE; if (version.length() > 0) { buffer.append(version); } else { // default to "1.0" buffer.append("1.0"); } buffer.append("; "); final String language = locale.getLanguage(); if (language != null) { buffer.append(language.toLowerCase()); final String country = locale.getCountry(); if (country != null) { buffer.append("-"); buffer.append(country.toLowerCase()); } } else { // default to "en" buffer.append("en"); } // add the model for the release build if ("REL".equals(Build.VERSION.CODENAME)) { final String model = Build.MODEL; if (model.length() > 0) { buffer.append("; "); buffer.append(model); } } final String id = Build.ID; if (id.length() > 0) { buffer.append(" Build/"); buffer.append(id); } return String.format(webUserAgent, buffer, "Mobile "); } /** * @param context * @param dirName Only the folder name, not full path. * @return app_cache_path/dirName */ public static String getDiskCacheDir(Context context, String dirName) { String cachePath = null; if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) { File externalCacheDir = context.getExternalCacheDir(); if (externalCacheDir != null) { cachePath = externalCacheDir.getPath(); } } if (cachePath == null) { File cacheDir = context.getCacheDir(); if (cacheDir != null && cacheDir.exists()) { cachePath = cacheDir.getPath(); } } return cachePath + File.separator + dirName; } @SuppressWarnings("deprecation") public static long getAvailableSpace(File dir) { try { final StatFs stats = new StatFs(dir.getPath()); return (long) stats.getBlockSize() * (long) stats.getAvailableBlocks(); } catch (Throwable e) { LogUtils.e(e.getMessage(), e); return -1; } } public static boolean isSupportRange(final HttpResponse response) { if (response == null) return false; Header header = response.getFirstHeader("Accept-Ranges"); if (header != null) { return "bytes".equals(header.getValue()); } header = response.getFirstHeader("Content-Range"); if (header != null) { String value = header.getValue(); return value != null && value.startsWith("bytes"); } return false; } public static String getFileNameFromHttpResponse(final HttpResponse response) { if (response == null) return null; String result = null; Header header = response.getFirstHeader("Content-Disposition"); if (header != null) { for (HeaderElement element : header.getElements()) { NameValuePair fileNamePair = element.getParameterByName("filename"); if (fileNamePair != null) { result = fileNamePair.getValue(); // try to get correct encoding str result = CharsetUtils.toCharset(result, HTTP.UTF_8, result.length()); break; } } } return result; } public static Charset getCharsetFromHttpRequest(final HttpRequestBase request) { if (request == null) return null; String charsetName = null; Header header = request.getFirstHeader("Content-Type"); if (header != null) { for (HeaderElement element : header.getElements()) { NameValuePair charsetPair = element.getParameterByName("charset"); if (charsetPair != null) { charsetName = charsetPair.getValue(); break; } } } boolean isSupportedCharset = false; if (!TextUtils.isEmpty(charsetName)) { try { isSupportedCharset = Charset.isSupported(charsetName); } catch (Throwable e) { } } return isSupportedCharset ? Charset.forName(charsetName) : null; } private static final int STRING_BUFFER_LENGTH = 100; public static long sizeOfString(final String str, String charset) throws UnsupportedEncodingException { if (TextUtils.isEmpty(str)) { return 0; } int len = str.length(); if (len < STRING_BUFFER_LENGTH) { return str.getBytes(charset).length; } long size = 0; for (int i = 0; i < len; i += STRING_BUFFER_LENGTH) { int end = i + STRING_BUFFER_LENGTH; end = end < len ? end : len; String temp = getSubString(str, i, end); size += temp.getBytes(charset).length; } return size; } // get the sub string for large string public static String getSubString(final String str, int start, int end) { return new String(str.substring(start, end)); } public static StackTraceElement getCurrentStackTraceElement() { return Thread.currentThread().getStackTrace()[3]; } public static StackTraceElement getCallerStackTraceElement() { return Thread.currentThread().getStackTrace()[4]; } private static SSLSocketFactory sslSocketFactory; public static void trustAllHttpsURLConnection() { // Create a trust manager that does not validate certificate chains if (sslSocketFactory == null) { TrustManager[] trustAllCerts = new TrustManager[] { new X509TrustManager() { @Override public java.security.cert.X509Certificate[] getAcceptedIssuers() { return null; } @Override public void checkClientTrusted(X509Certificate[] certs, String authType) { } @Override public void checkServerTrusted(X509Certificate[] certs, String authType) { } } }; try { SSLContext sslContext = SSLContext.getInstance("TLS"); sslContext.init(null, trustAllCerts, null); sslSocketFactory = sslContext.getSocketFactory(); } catch (Throwable e) { LogUtils.e(e.getMessage(), e); } } if (sslSocketFactory != null) { HttpsURLConnection.setDefaultSSLSocketFactory(sslSocketFactory); HttpsURLConnection.setDefaultHostnameVerifier( org.apache.http.conn.ssl.SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER); } } }