使用TimerTask控制ProgressBar

• 非UI线程可以去刷新UI吗（timertask调用progressbar的setProgress的特例）
• ProgressBar的自定义使用和详细说明
• ProgressBar使用
• C#使用定时器Timer控件制作进度条ProgressBar
• 超简单的 ProgressBar + AlertDialo

需要的知识：
1、ProgressBar
2、Thread
3、Timer和TimerTask
 

 
package cc.androidos.pb;
import java.util.Timer;
import java.util.TimerTask;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.ProgressBar;

/**
 * <p>
 * Progress Bar test
 * </p>
 * @author SinFrancis Wong
 * @version 1.0
 * @since 2009-3-10
 */
public class ProgressBarTest extends Activity
{
    /** Called when the activity is first created. */
    private ProgressBar mProgress = null;
    /**Static for control the progress*/
    public static int mProgressStatus = 0;
    /**Handler for post message into OS and change UI */
    private Handler mHandler = new Handler();
    @Override
    public void onCreate( Bundle savedInstanceState )
    {
        super.onCreate( savedInstanceState );
        //set the View
        setContentView( R.layout.main );
       
        mProgress = ( ProgressBar ) findViewById( R.id.ProgressBar01 );
       
        //Progress Bar Click !
        mProgress.setOnClickListener( new View.OnClickListener()
        {
            @Override
            public void onClick( View arg0 )
            {
                ProgressBarTest.mProgressStatus = 0;
                // a new Timer
                Timer tt = new Timer();
                //Schedule the TimerTash , delay is 0 ms, every 1000ms execute the action
                tt.schedule( new ReTimerTask(), 0, 1 * 1000 );
               
                //Scout the progress
                scoutProgress.start();
            }
        } );
    }
    /**
     * Scout the progress
     */
    Thread scoutProgress = new Thread( new Runnable()
    {
        public void run()
        {
            while ( mProgressStatus < 100 )
            {
                // Update the progress bar
                mHandler.post( new Runnable()
                {
                    public void run()
                    {
                        mProgress.setProgress( mProgressStatus );
                    }
                } );
            }
        }
    } );
}

/**
 * A new TimerTask
 * @author SinFrancis Wong
 * @version 1.0
 * @since 2009-3-10
 */
class ReTimerTask extends TimerTask
{
    @Override
    public void run()
    {
        //以下是监测进度到什么位置，如果在75范围内就对进度+5，如果在75----100之间就对进度+1，否则取消此任务
        if( ProgressBarTest.mProgressStatus < 75 )
        {
            ProgressBarTest.mProgressStatus += 5;
            System.err.println( "<75......." + ProgressBarTest.mProgressStatus );
        }
        else if( ProgressBarTest.mProgressStatus < 100
            && ProgressBarTest.mProgressStatus >= 75 )
        {
            ProgressBarTest.mProgressStatus += 1;
            System.err.println( ">75 || <100......."
                + ProgressBarTest.mProgressStatus );
        }
        else if( ProgressBarTest.mProgressStatus >= 100 )
        {
            System.err
                .println( ">100......." + ProgressBarTest.mProgressStatus );
            cancel();
        }
    }
}
 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical" android:layout_width="fill_parent"
 android:layout_height="fill_parent">
 <TextView android:layout_width="fill_parent"
  android:layout_height="wrap_content" android:text="@string/hello" />
 <ProgressBar android:id="@+id/ProgressBar01"
  android:layout_width="100px"
  android:layout_height="20px"
  android:max="100"
  android:progress="0"
  style="?android:attr/progressBarStyleHorizontal"
//style设置是为了使得ProgressBar变成进度条而不是圆圈
  >
 </ProgressBar>
</LinearLayout>