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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.

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Android Intent开发实例 核心代码：package com.amaker.ch06.app;import com.amaker.ch06.app.R;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;/** * @author 郭宏志 * 发送Email */public class MainActivity extends Activity { // 声明视图组件 private EditText toEditText,subjectEditText,contentEditText; private Button sendBtn; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // 实例化视图组件 toEditText = (EditText)findViewById(R.id.toEditText01); subjectEditText = (EditText)findViewById(R.id.subjectEditText01); contentEditText = (EditText)findViewById(R.id.contentEditText01); sendBtn = (Button)findViewById(R.id.sendButton01); // 为按钮添加单击监听器 sendBtn.setOnClickListener(listener); } // 发送按钮单击监听器 private OnClickListener listener = new OnClickListener() { @Override public void onClick(View v) { // 获得输入信息 String to = toEditText.getText().toString(); String subject = subjectEditText.getText().toString(); String content = contentEditText.getText().toString(); // 创建Intent Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND); // 设置内容类型 emailIntent.setType("plain/text"); // 设置额外信息 emailIntent.putExtra(android.content.Intent.EXTRA_EMAIL, new String[]{to}); emailIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, subject); emailIntent.putExtra(android.content.Intent.EXTRA_TEXT, content); startActivity(Intent.createChooser(emailIntent, "发送邮件...")); } };}