摘要：
Lockjava.util.concurrent.locks.LockKnown Indirect SubclassesReentrantLock,ReentrantReadWriteLock.ReadLock,ReentrantReadWriteLock.WriteLockClass OverviewLockimplementations provide more extensive locking operations than can be obtained usingsynchronizedmethods and statements. They allow more flexible 阅读全文
摘要：
好久没用sqLite又忘了,今天搞了一下SQLiteDatabase是安卓里的数据库类,实际使用时几乎都是用SQLiteDatabaseHelp类,写一个其子类, override onCreate和onUpdate 两个方法即可. 首次运行软件执行onCreate , versionCode更新时调用onUpdate方法.然后使用helper.getWritableDatabase和getReadableDatabase两个方法 阅读全文