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简单定位

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本项目是一个仓库管理的安卓毕业设计项目源码，已升级到 andriod studio 3.5 只是初步了实现了单机的仓库管理操作，可以对商品、客户、供应商信息进行简单的增删改查，也可以简单的进行库存管理，在实用性方面做的比较差强人意，不过可以修改一下作为自己的毕业设计。本项目包括安卓客户端源码、一个26页的毕设报告、一个开题报告，本项目是一个简单的安卓仓库管理系统模型，不要指望有多高的实际应用性。不过应付一般的本科专科水平的毕业设计完全没有问题。编译版本2.3.3编码GBK，源码有简单的注释。也可以作为安卓新手练习SQLite使用的例子。管理员默认用户名密码都是javaapk

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android手机的通讯录联系人全部都存在系统的数据库中，如果须要获得通讯里联系人的信息就须要访问系统的数据库，才能将信息拿出来。 这一篇文章我主要带领同学们熟悉Android的通讯录机制。

Rules::The AsyncTask instance must be created in UI thread. .execute must be invoked on the UI thread.Never call  objMyTask.onPreExecute(), objMyTask.doInBackground(), objMyTask.onProgressUpdate(),  objMyTask.onPostExecute manually.The AsyncTask can be executed only once (an exception will be thrown if a second execution is attempted.)AsyncTask have Four Main Method... onPreExecute()  doInBackground() onProgressUpdate() onPostExecute()  onPreExecute-This method is called first when you start AsyncTask using objAsync.execute().And mostly this method is use for initializing dialog(ProgressDialog,CustomDialog) and showing. doInBackground-The main purpose of AsyncTask is accomplished by this method.Any non-UI thread process is running in this method.Such as Rss Feed Reader,Image and video Uploading and Downloading.You cant handle your View in this method.Because this method is non-UI thread.While any background process is running if you want to handle UI therea are  onProgressUpdate method. after completion of process this method send result to OnPostExecute. onProgressUpdate-While backgrounding task is running ,you can handle your UI using this method .Such as status of downloading or uploading task.and this method is called from  doInBackground.Using publishProgress() you can call onProgressUpdate method to update UI while process is running. onPostExecute -This method is called after the background computation finishes.The result of background process in passed in this method as parameters.And now you can dismiss progress dialog ,to indicate that background task is completed. You can cancel AsyncTask using objAsyncTask.cancel().then you just check in doInBackground, if (isCancelled()) { break; } else {        //continue... } See this Image For more Clear.