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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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package com.zf.iosdialog.widget;import android.app.Dialog;import android.content.Context;import android.view.Display;import android.view.LayoutInflater;import android.view.View;import android.view.View.OnClickListener;import android.view.WindowManager;import android.widget.Button;import android.widget.FrameLayout;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.LinearLayout.LayoutParams;import android.widget.TextView;import com.zf.iosdialog.R;public class AlertDialog {private Context context;private Dialog dialog;private LinearLayout lLayout_bg;private TextView txt_title;private TextView txt_msg;private Button btn_neg;private Button btn_pos;private ImageView img_line;private Display display;private boolean showTitle = false;private boolean showMsg = false;private boolean showPosBtn = false;private boolean showNegBtn = false;public AlertDialog(Context context) {this.context = context;WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);display = windowManager.getDefaultDisplay();}public AlertDialog builder() {// 获取Dialog布局View view = LayoutInflater.from(context).inflate(R.layout.view_alertdialog, null);// 获取自定义Dialog布局中的控件lLayout_bg = (LinearLayout) view.findViewById(R.id.lLayout_bg);txt_title = (TextView) view.findViewById(R.id.txt_title);txt_title.setVisibility(View.GONE);txt_msg = (TextView) view.findViewById(R.id.txt_msg);txt_msg.setVisibility(View.GONE);btn_neg = (Button) view.findViewById(R.id.btn_neg);btn_neg.setVisibility(View.GONE);btn_pos = (Button) view.findViewById(R.id.btn_pos);btn_pos.setVisibility(View.GONE);img_line = (ImageView) view.findViewById(R.id.img_line);img_line.setVisibility(View.GONE);// 定义Dialog布局和参数dialog = new Dialog(context, R.style.AlertDialogStyle);dialog.setContentView(view);// 调整dialog背景大小lLayout_bg.setLayoutParams(new FrameLayout.LayoutParams((int) (display.getWidth() * 0.85), LayoutParams.WRAP_CONTENT));return this;}public AlertDialog setTitle(String title) {showTitle = true;if ("".equals(title)) {txt_title.setText("标题");} else {txt_title.setText(title);}return this;}public AlertDialog setMsg(String msg) {showMsg = true;if ("".equals(msg)) {txt_msg.setText("内容");} else {txt_msg.setText(msg);}return this;}public AlertDialog setCancelable(boolean cancel) {dialog.setCancelable(cancel);return this;}public AlertDialog setPositiveButton(String text,final OnClickListener listener) {showPosBtn = true;if ("".equals(text)) {btn_pos.setText("确定");} else {btn_pos.setText(text);}btn_pos.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {listener.onClick(v);dialog.dismiss();}});return this;}public AlertDialog setNegativeButton(String text,final OnClickListener listener) {showNegBtn = true;if ("".equals(text)) {btn_neg.setText("取消");} else {btn_neg.setText(text);}btn_neg.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {listener.onClick(v);dialog.dismiss();}});return this;}private void setLayout() {if (!showTitle && !showMsg) {txt_title.setText("提示");txt_title.setVisibility(View.VISIBLE);}if (showTitle) {txt_title.setVisibility(View.VISIBLE);}if (showMsg) {txt_msg.setVisibility(View.VISIBLE);}if (!showPosBtn && !showNegBtn) {btn_pos.setText("确定");btn_pos.setVisibility(View.VISIBLE);btn_pos.setBackgroundResource(R.drawable.alertdialog_single_selector);btn_pos.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {dialog.dismiss();}});}if (showPosBtn && showNegBtn) {btn_pos.setVisibility(View.VISIBLE);btn_pos.setBackgroundResource(R.drawable.alertdialog_right_selector);btn_neg.setVisibility(View.VISIBLE);btn_neg.setBackgroundResource(R.drawable.alertdialog_left_selector);img_line.setVisibility(View.VISIBLE);}if (showPosBtn && !showNegBtn) {btn_pos.setVisibility(View.VISIBLE);btn_pos.setBackgroundResource(R.drawable.alertdialog_single_selector);}if (!showPosBtn && showNegBtn) {btn_neg.setVisibility(View.VISIBLE);btn_neg.setBackgroundResource(R.drawable.alertdialog_single_selector);}}public void show() {setLayout();dialog.show();}}

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