解析android中ProgressBar的用法

public class EX04_17 extends Activity
{
  private TextView mTextView01;
  private Button mButton01;
  private ProgressBar mProgressBar01;
  public int intCounter=0;

 
  protected static final int GUI_STOP_NOTIFIER=0x108;
  protected static final int GUI_THREADING_NOTIFIER=0x109;

 
  @Override
  public void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    mButton01=(Button)findViewById(R.id.myButton1);
    mTextView01=(TextView)findViewById(R.id.myTextView1);

   
    mProgressBar01=(ProgressBar)findViewById(R.id.myProgressBar1);

   
    mProgressBar01.setIndeterminate(false);

   
    mButton01.setOnClickListener(new Button.OnClickListener()
    {
      @Override
      public void onClick(View v)
      {
        // TODO Auto-generated method stub

       
        mTextView01.setText(R.string.str_progress_start);

       
        mProgressBar01.setVisibility(View.VISIBLE);

       
        mProgressBar01.setMax(100);

       
        mProgressBar01.setProgress(0);

       
        new Thread(new Runnable()
        {
          public void run()
          {
           
            for (int i=0;i<10;i++)
            {
              try
              {
               
                intCounter=(i+1)*20;
               
                Thread.sleep(1000);

               
                if(i==4)
                {
                 
                  Message m=new Message();

                 
                  m.what=EX04_17.GUI_STOP_NOTIFIER;
                  EX04_17.this.myMessageHandler.sendMessage(m);
                  break;
                }
                else
                {
                  Message m=new Message();
                  m.what=EX04_17.GUI_THREADING_NOTIFIER;
                  EX04_17.this.myMessageHandler.sendMessage(m);
                }
              }
              catch(Exception e)
              {
                e.printStackTrace();
              }
            }
          }
        }).start();
      }
    });
  }

 
  Handler myMessageHandler=new Handler()
  {
    // @Override
    public void handleMessage(Message msg)
    {
      switch (msg.what)
      {
       
        case EX04_17.GUI_STOP_NOTIFIER:

         
          mTextView01.setText(R.string.str_progress_done);

         
          mProgressBar01.setVisibility(View.GONE);
          Thread.currentThread().interrupt();
          break;

       
        case EX04_17.GUI_THREADING_NOTIFIER:
          if(!Thread.currentThread().isInterrupted())
          {
            mProgressBar01.setProgress(intCounter);
           
            mTextView01.setText
            (
              getResources().getText(R.string.str_progress_start)+
              "("+Integer.toString(intCounter)+"%)/n"+
              "Progress:"+
              Integer.toString(mProgressBar01.getProgress())+
              "/n"+"Indeterminate:"+
              Boolean.toString(mProgressBar01.isIndeterminate())
            );
          }
          break;
      }
      super.handleMessage(msg);
    }
  };
}