Android 对话框中的进度条

首先需要创建ProgressDialog对象，然后使用线程控制进度条显示，具体源代码：
package com.yarin.Android.TestOnPDialog;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class PDialog extends Activity
{
    private Button mButton01,mButton02;
  
    int m_count = 0;
    //声明进度条对话框
    ProgressDialog m_pDialog;
  
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
      
        //得到按钮对象
        mButton01 = (Button)findViewById(R.id.Button01);
        mButton02 = (Button)findViewById(R.id.Button02);
      
        //设置mButton01的事件监听
        mButton01.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View v)
            {
                // TODO Auto-generated method stub
              
                //创建ProgressDialog对象
                m_pDialog = new ProgressDialog(PDialog.this);

// 设置进度条风格，风格为圆形，旋转的
                m_pDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);

// 设置ProgressDialog 标题
                m_pDialog.setTitle("提示");
              
                // 设置ProgressDialog 提示信息
                m_pDialog.setMessage("这是一个圆形进度条对话框");

// 设置ProgressDialog 标题图标
                m_pDialog.setIcon(R.drawable.img1);

// 设置ProgressDialog 的进度条是否不明确
                m_pDialog.setIndeterminate(false);
              
                // 设置ProgressDialog 是否可以按退回按键取消
                m_pDialog.setCancelable(true);
              
                // 设置ProgressDialog 的一个Button
                m_pDialog.setButton("确定", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int i)
                    {
                        //点击“确定按钮”取消对话框
                        dialog.cancel();
                    }
                });

// 让ProgressDialog显示
                m_pDialog.show();
            }
        });
      
      //设置mButton02的事件监听
        mButton02.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View v)
            {
                // TODO Auto-generated method stub
              
                m_count = 0;
              
                // 创建ProgressDialog对象
                m_pDialog = new ProgressDialog(PDialog.this);
              
                // 设置进度条风格，风格为长形
                m_pDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
              
                // 设置ProgressDialog 标题
                m_pDialog.setTitle("提示");
              
                // 设置ProgressDialog 提示信息
                m_pDialog.setMessage("这是一个长形对话框进度条");
              
                // 设置ProgressDialog 标题图标
                m_pDialog.setIcon(R.drawable.img2);
              
                // 设置ProgressDialog 进度条进度
                m_pDialog.setProgress(100);
              
                // 设置ProgressDialog 的进度条是否不明确
                m_pDialog.setIndeterminate(false);
              
                // 设置ProgressDialog 是否可以按退回按键取消
                m_pDialog.setCancelable(true);
              
                // 让ProgressDialog显示
                m_pDialog.show();
              
                new Thread()
                {
                    public void run()
                    {
                        try
                        {
                            while (m_count <= 100)
                            {
                                // 由线程来控制进度。
                                m_pDialog.setProgress(m_count++);
                                Thread.sleep(100);
                            }
                            m_pDialog.cancel();
                        }
                        catch (InterruptedException e)
                        {
                            m_pDialog.cancel();
                        }
                    }
                }.start();
              
            }
        });
    }
}