摘要： 为书面语言提供统一的字符编码用十六进制(hexadecimal)表示一个字符16bitshttps://docs.oracle.com/javase/tutorial/i18n/text/unicode.html 阅读全文

摘要： xml源码如下 ... 阅读全文

摘要： shuts down an ExecutorService in two phases, first by calling shutdown to reject incoming tasks, and then calling shutdownNow, if necessary, to cancel any lingering tasks: void shutdownAndAwaitTermination(ExecutorService pool) { pool.shutdown(); // Disable new tasks from being submitted try { ... 阅读全文

摘要： private static final int CONNECTION_TIMEOUT = 10000; public static String doHttpGet(String serverURL) throws Exception { HttpParams httpParameters = new BasicHttpParams(); HttpConnectionParams.setConnectionTimeout(httpParameters, CONNECTION_TIMEOUT); HttpConnectionParams.... 阅读全文

摘要： 如何保证只有一个线程在运行，在启动线程的时候停止之前的线程？实例如下： private volatile Thread udpSendThread;线程：class UdpSender extends Thread { @Override public void run() { if (udpSendThread == null) { return; } // other work } }启动线程： private void startUdpSe... 阅读全文

摘要： Fragment弹出toast，时不时出现getActivity()空指针，具体原因未查到。解决办法： if (null == fragment || !fragment.isAdded()) { return; }原地址http://stackoverflow.com/questions/11631408/android-fragment-getactivity-sometime-returns-null 阅读全文

摘要： public class WifiAutoConnectManager {private static final String TAG = WifiAutoConnectManager.class.getSimpleName();WifiManager wifiManager; // 定义几种加密方式，一种是WEP，一种是WPA，还有没有密码的情况 public enum WifiCipherType { WIFICIPHER_WEP, WIFICIPHER_WPA, WIFICIPHER_NOPASS, WIFICIPHER_INVALID } // 构造函数 ... 阅读全文

摘要： update user set name= '**' where account = 'pon' Error Code: 1175.You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column To disable safe mode, toggle the option in Preferences -> SQL Queries and reconnect. 0.000 secSET SQL_SAFE_UPDATE 阅读全文

摘要： org.apache.jasper.JasperException: Unable to compile class for JSP: An error occurred at line: 23 in the generated java fileThe method getJspApplicationContext(ServletContext) is undefined for the type JspFactoryStacktrace: org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandle 阅读全文

摘要： 解决办法，为远程创建用户并给予权限mysql> CREATE USER 'monty'@'localhost' IDENTIFIED BY 'some_pass';mysql> GRANT ALL PRIVILEGES ON *.* TO 'monty'@'localhost' -> WITH GRANT OPTION;mysql> CREATE USER 'monty'@'%' IDENTIFIED BY 'some_pass';mysql& 阅读全文