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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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使用线程和套接字的聊天
Mulitthreaded 聊天应用程序，在 java 中 （迷你项目） 是一个多线程编程源代码使用线程 and 套接字
- 2022-10-08 18:15:02下载
- 积分：1
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listView
android的LiseView，可以添加和删除list。(Android LiseView of, can add and delete list.
)
- 2012-04-22 08:40:50下载
- 积分：1
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jAVA计算器实现界面化
Java老师让做的实验，想与大家分享下，同时满足那些有》》的同志们，该计算器，有可视化界面，同时简单易懂，是一个非常简单的程序，
- 2022-10-15 07:25:03下载
- 积分：1
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Basic Payroll jFrame
这是制作javajframe的基本示例。
- 2022-05-06 01:39:48下载
- 积分：1
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BLE4.0聊天实例
BLE4.0聊天实例
- 2015-05-19下载
- 积分：1
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认证冬眠
资源描述认证认证Hibernate Hibernate ； ；认证Hibernate ；认证认证Hibernate Hibernate ； ；认证Hibernate ；认证认证Hibernate Hibernate ； ；认证冬眠
- 2023-08-30 08:55:03下载
- 积分：1
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考试系统
package exame;
import java.util.Arrays;
/**
* DESC:用来描述多选题
* @author Administrator
*
*/
public class MuiltQuestion
extends Question{
private char[] answers;//保存多选题的答案
//创建一道多选题
public MuiltQuestion()
- 2022-05-18 16:25:25下载
- 积分：1
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prjHello
Google Android SDK开发范例大全(完整版)虽然半行代码都没有写，但向导却帮忙写好了程序进入点、布局配置、字符 串常数、应 用程序访问权限等， 除了可作为程序模板之外， 也是 Android 手机程 序的最佳学习范例。让 我们回过头来看看刚才 Android 项目建立向导帮忙做了哪些工作， 以此来 了解 Android 应 用程序的生命周期及其文件组成方式； 首先， 展开 (package helloworld.irdc.eracom.com.cn import android.app.Activity import android.os.Bundle public class HelloWorld extends Activity { * Called when the activity is first created. @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState) setContentView(R.layout.main) } } )
- 2015-12-22 12:23:05下载
- 积分：1
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EXPMA 计算
指数平均数指标(Exponential Moving Average，EXPMA或EMA)
- 2022-10-26 16:45:03下载
- 积分：1
