Android如何实现横向进度条演示效果

package com.zengtao.classwork; 
 
import android.os.Bundle; 
import android.os.Handler; 
import android.os.Message; 
import android.support.v7.app.ActionBarActivity; 
import android.widget.ProgressBar; 
 
public class MainActivity extends ActionBarActivity { 
  private ProgressBar pb; // 进度条 
  private int[] randData = new int[100]; // 数组 
  private int index = 0; // 索引 
  private int mProgressStaus = 0; // 设置进度条的长度 
  private Handler mHandler; 
 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
 
    pb = (ProgressBar) findViewById(R.id.pb); 
 
    // 初始化handle，绑定在主线程中的队列消息中 
    mHandler = new Handler() { 
      @Override 
      public void handleMessage(Message msg) { 
        super.handleMessage(msg); 
        // 接收消息 
        if (msg.what == 0x111) { 
          mProgressStaus = index; 
          pb.setProgress(mProgressStaus); 
        } 
      } 
    }; 
    // 创建子线程，在子线程中处理耗时工作 
    new Thread() { 
      @Override 
      public void run() { 
        super.run(); 
        while (index < 100) { 
          doWork(); 
          Message msg = new Message(); 
          msg.what = 0x111; 
          mHandler.sendMessage(msg); 
        } 
      } 
 
    }.start(); 
  } 
 
  /** 
   * 模拟耗时工作（一定要在子线程中做） 
   * 
   * @return 进度条的多少 
   */ 
  public int doWork() { 
    randData[index++] = (int) (Math.random() * 100); 
    try { 
      Thread.sleep(100); 
    } catch (InterruptedException e) { 
      e.printStackTrace(); 
    } 
    return index; 
  } 
}