android开发步步为营之26：进度条对话框ProgressDialog的用法

ProgressDialog进度对话框也是一个用的很广的控件，比如下载、支付、或者游戏里面打怪当前进度是多少了呢？那就需要它弹出来提醒用户了。既然是对话框，如果用户没有关闭它，就不能进行其他操作，先看看sdk里面是怎么说的。
public class ProgressDialog extends AlertDialog
java.lang.Object
   ↳ android.app.Dialog
     ↳ android.app.AlertDialog
       ↳ android.app.ProgressDialog
Class Overview
 
A dialog showing a progress indicator and an optional text message or view. Only a text message or a view can be used at the same time.
The dialog can be made cancelable on back key press.
The progress range is 0..10000.
从继承关系可以看出它继承成AlertDialog，所以我们可以理解成功ProgressDialog=ProgressBar+AlertDialog。本篇先讨论怎么简单的使用系统自带的ProgressDialog，后面一篇文章将学习，如何编写我们自定义的ProgressDialog，自定义组件是一个研究话题，人家编写SDK的作者也不可能做到面面俱到的满足所有人的需求，不过提供了我们扩展的机会。好，开始我们的实验。
第一步、编写页面progressview.xml
放置了两个按钮
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent">
    <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="显示圆形进度条" android:id="@+id/btnspinner" android:layout_alignParentTop="true" android:layout_alignParentLeft="true" android:layout_marginTop="25dp" android:layout_alignParentRight="true"></Button>
    <Button android:id="@+id/btnhorizon" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="显示条形进度条" android:layout_below="@+id/btnspinner" android:layout_alignParentLeft="true" android:layout_marginTop="38dp" android:layout_alignParentRight="true"></Button>
</RelativeLayout>
 
第二步、编写页面Activity ProgressActivity.java
 
/**
 *
 */
package com.figo.helloworld;
 
import android.app.Activity;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
 
/**
 * @author zhuzhifei
 *
 */
public class ProgressActivity extends Activity implements OnClickListener {
         Button btnspinner;
         Button btnhorizon;
         int mCount;
         ProgressDialog pd;
         String tag="ProgressActivity";
 
         protected void onCreate(Bundle savedInstanceState) {
                   super.onCreate(savedInstanceState);
                   setContentView(R.layout.progressview);
                   btnspinner = (Button) findViewById(R.id.btnspinner);
                   btnspinner.setOnClickListener(this);
                   btnhorizon = (Button) findViewById(R.id.btnhorizon);
                   btnhorizon.setOnClickListener(this);
 
         }
 
         // 按钮事件
         @Override
         public void onClick(View v) {
                   // TODO Auto-generated method stub
                   // 构建一个下载进度条
                   switch (v.getId()) {
                   case R.id.btnspinner:
                            mCount = 0;
                            pd = new ProgressDialog(ProgressActivity.this);
                            pd.setProgressStyle(ProgressDialog.STYLE_SPINNER);// 设置风格为圆形进度条
                            pd.setTitle("提示");// 设置标题
                            pd.setIcon(R.drawable.icon);// 设置图标
                            pd.setMessage("这是一个圆形进度条");
                            pd.setIndeterminate(false);// 设置进度条是否为不明确
                            pd.setButton("确定", new DialogInterface.OnClickListener() {
                                     @Override
                                     public void onClick(DialogInterface dialog, int which) {
                                               dialog.dismiss();
 
                                     }
 
                            });
                            pd.show();
                            MyThread thread1 = new MyThread();
                            new Thread(thread1).start();
                            break;
                   case R.id.btnhorizon:
                            mCount = 0;
                            pd = new ProgressDialog(ProgressActivity.this);
                            pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
                            pd.setTitle("提示");
                            pd.setIcon(R.drawable.icon);
                            pd.setMessage("这是一个长型进度条");
                            pd.setMax(100);
                            pd.setProgress(0);
                            pd.setSecondaryProgress(20);
                            pd.setIndeterminate(false);
                            pd.setButton("取消", new DialogInterface.OnClickListener() {
                                     @Override
                                     public void onClick(DialogInterface dialog, int which) {
                                               dialog.dismiss();
 
                                     }
 
                            });
                            pd.show();
                            MyThread thread2 = new MyThread();
                            new Thread(thread2).start();
                            break;
                   }
         }
 
         // 创建子线程
         class MyThread implements Runnable {
                   public void run() {
 
                             try{
                 while(mCount<=100){
                          pd.setProgress(mCount++);
                     Thread.sleep(100);
                 }
                 pd.dismiss();
             }catch(Exception ex){
                      pd.dismiss();
             }
 
 
                   }
 
         }
}
 
 
第三步、AndroidManifest.xml注册我们的Activity
<activity android:name=".ProgressActivity">
           <intent-filter>
              <action android:name="android.intent.action.MAIN" />
              <category android:name="android.intent.category.LAUNCHER" />
           </intent-filter>
</activity>
 
第四步、运行效果