Android 平台中关于多个Activity 要同时关闭的问题。文档提供了三四种有效方法-Activity on the Android platform to simultaneously turn off many problems. Document provides a three-four effective methods

读取数据的四种方法：sharedpreferences、数据库sqlite、从xml文件中读取数据，从txt文件中读取数据-Reading of the data of the four methods: sharedpreferences, database sqlite, from an XML file reading of the data, from TXT file in the reading of the data

Android EditText限制输入的四种方法,很简单.-Android EditText restrict the importation of four methods, very simple.

Android 定位一般有四种方法，这四种方式分别是：GPS定位，WIFI定位，基站定位，AGPS定位。 本文主要记录一下GPS定位：这种方式需要手机支持GPS模块硬件支持。(Android positioning generally there are four ways, these four ways are: GPS positioning, WIFI positioning, base station positioning, AGPS positioning. This articl