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android 异步 执行 任务 例子 附讲解
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.
- 2013-07-05下载
- 积分：1
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android中ListView控件 通过onItemClick点击事件传递参数源码
通过点击listview的item 传递参数 示例
- 2014-04-12下载
- 积分：1
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android 闪光灯的简单控制 例子源码下载
android 闪光灯的简单控制 例子源码下载
- 2014-11-03下载
- 积分：1
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gallry输出视频每一帧图片
实现截取视频中每一帧图片在gallry上显示出来
- 2014-06-26下载
- 积分：1
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android 转盘抽奖 实例源码
android 转盘抽奖 实例源码
- 2013-06-16下载
- 积分：1
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CamMonitor-Android CamMonitor摄像头监控捕获和接收视频源代码程序.rar
CamMonitor-Android CamMonitor摄像头监控捕获和接收视频源代码程序.rar
- 2015-05-21下载
- 积分：1
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Android开发中相当便捷的JSON反序列化实现（含源代码） 连带有handler和进度条功能
Handler handler = new Handler(){@Overridepublic void handleMessage(Message msg) {switch (msg.what) {case 1://反序列化结果在handler里使用MagazineCategoryResp magazineCatagoryList = (MagazineCategoryResp) msg.obj;//这里打印查看结果 可以以类的方式获取json值System.out.println("Result=" magazineCatagoryList.data.get(0).name);tvTest.setText(magazineCatagoryList.data.get(0).name);break;}super.handleMessage(msg);}};
- 2014-05-13下载
- 积分：1
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3-PSS并联机器人可达工作空间绘制的MATLAB程序
自己做的3-PSS并联机器人可达工作空间绘制的MATLAB程序，workspace_main.m为主程序，在MATLAB中进入解压缩后的文件夹并运行workspace_main即可完成绘图。另外Trirspace.m为3-RRR平面并联机器人可达工作空间的绘图程序，调用方法相同。
- 2020-05-26下载
- 积分：1
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android 转盘抽奖程序源码 很容易扩展
android 转盘抽奖程序源码 很容易扩展
- 2014-01-02下载
- 积分：1
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matlab中对红外光谱的预处理代码
matlab中对红外光谱的预处理代码,源代码 包括 对红外光谱的平滑处理、一阶求导 、二阶求导等。以及 回归分析
- 2020-05-26下载
- 积分：1
