Android编程实现类似于圆形ProgressBar的进度条效果

package cn.easymobi.application.bell.common;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;
public class ProgressView extends View{
  private float fArcNum;
  private float fMax;
  private float density;
  public float getDensity() {
    return density;
  }
  public void setDensity(float density) {
    this.density = density;
  }
  public ProgressView(Context context) {
    super(context);
  }
  public ProgressView(Context context,AttributeSet attrs) {
    super(context,attrs);
  }
  protected void onDraw(Canvas canvas) {
    // TODO Auto-generated method stub
    super.onDraw(canvas);
    Paint paint=new Paint();
    if(fArcNum>0)
      {
      paint.setColor(Color.GRAY);
      paint.setFlags(Paint.ANTI_ALIAS_FLAG);
      canvas.drawCircle(40*density/2, 40*density/2, 40*density/2, paint);
    }
    paint.setColor(Color.YELLOW);
    paint.setFlags(Paint.ANTI_ALIAS_FLAG);
    //paint.setStrokeWidth(2);
    RectF rect=new RectF(0, 0, 40*density, 40*density);
    canvas.drawArc(rect, -90, fArcNum,true, paint);
    paint.setColor(Color.BLACK);
    paint.setFlags(Paint.ANTI_ALIAS_FLAG);
    canvas.drawCircle(40*density/2, 40*density/2, 40*density/2-5, paint);
  }
  public void setProgress(float num) {
    fArcNum = (num/fMax) * 360;
  }
  public float getfArcNum() {
    return fArcNum;
  }
  public void setfArcNum(float fArcNum) {
    this.fArcNum = fArcNum;
  }
  public float getfMax() {
    return fMax;
  }
  public void setfMax(float fMax) {
    this.fMax = fMax;
  }
}

// *******************************************************************
// Func: playAudio
//
// by: Sun
// 2011.9.1
// *******************************************************************
public void playAudio(final String path, final ProgressBar pb) {
  Thread thread = new Thread(new Runnable() {
    public void run() {
      try {
        if (mpMediaPlayer != null) {
          mpMediaPlayer.stop();
          mpMediaPlayer.release();
          mpMediaPlayer = null;
        }
        mpMediaPlayer = new MediaPlayer();
        mpMediaPlayer.setDataSource(path);
        mpMediaPlayer.prepare();
        mpMediaPlayer.setOnPreparedListener(new OnPreparedListener() {
          public void onPrepared(MediaPlayer mp) {
            pb.setVisibility(ProgressBar.GONE);
            frontPv.setfMax(mpMediaPlayer.getDuration());
            frontPv.setProgress(0);
            mpMediaPlayer.start();
            refrash = new Thread(new Runnable() {
              public void run() {
                try {
                  while (frontPv.getfArcNum() <= 360 && mpMediaPlayer.isPlaying()) {
                    if (bIsOver)
                      break;
                    frontPv.setProgress(mpMediaPlayer.getCurrentPosition());
                    Thread.sleep(1000);
                    mHandle.sendEmptyMessage(MSG_REFRESH_UI);
                  }
                  mHandle.sendEmptyMessage(MSG_PLAY_OVER);
                }
                catch (Exception e) {
                  e.printStackTrace();
                }
              }
            });
            refrash.start();
          }
        });
      }
      catch (Exception e) {
        e.printStackTrace();
      }
    }
  });
  thread.start();
}