/**
  * 熒光點(diǎn)
  */
 private class FluorescencePointF{
  public PointF mPointF; //熒光點(diǎn)坐標(biāo)
  public long mStartTime; //開(kāi)始時(shí)間
  private float mRadius; //熒光點(diǎn)半徑
  private final float MAX_RADIUS = Constant.sScaleX * 15; //熒光點(diǎn)最大半徑
  private final float MIN_RADIUS = Constant.sScaleX * 8; //熒光點(diǎn)最小半徑
  private final long SHOW_TIME = 600;     //熒光維持時(shí)間
  private final Interpolator DEC_INTERPOLATOR = new DecelerateInterpolator(); //減速
  /**
   * 構(gòu)造方法
   */
  public FluorescencePointF(PointF pointF) {
   this.mPointF = pointF;
   this.mStartTime = System.currentTimeMillis();
   this.mRadius = MIN_RADIUS + mRandom.nextInt((int) MAX_RADIUS);
   Log.e(TAG,"FluorescencePointF point:" + "x:" +pointF.x + " y:" + pointF.y);
   Log.e(TAG,"FluorescencePointF radius:" + this.mRadius);
  }
  /**
   * 獲得半徑
   */
  public float getRadius(){
   if(!isAlive()) return 0;
   return mRadius * DEC_INTERPOLATOR.getInterpolation(
     ((float)SHOW_TIME - (System.currentTimeMillis() - mStartTime))/ SHOW_TIME);
  }
  /**
   * 熒光點(diǎn)是否生存
   * @return
   */
  public boolean isAlive(){
    return System.currentTimeMillis() - mStartTime <= SHOW_TIME;
  }
 }

Shader shader = new RadialGradient(fluorescencePointF.mPointF.x,fluorescencePointF
     .mPointF.y,radius,COLOR_WHITE,COLOR_WHITE_SHADER,
     Shader.TileMode.CLAMP);
   mPaintShader.setShader(shader);
   canvas.drawCircle(fluorescencePointF.mPointF.x,fluorescencePointF.mPointF.y,
     fluorescencePointF.getRadius(),mPaintShader);

 @Override
 public boolean onTouchEvent(MotionEvent event) {
 int action = event.getAction();
 mTouchPoint.x = event.getX();
 mTouchPoint.y = event.getY();
 switch (action){
  //手指按下的時(shí)候，在手指附近區(qū)域生成熒光點(diǎn)
  case MotionEvent.ACTION_DOWN:
  mStartPoint.x = mTouchPoint.x;
  mStartPoint.y = mTouchPoint.y;
  createRandomPoints();
  invalidate();
  break;
  //手指移動(dòng)，繼續(xù)生成熒光點(diǎn) 
  case MotionEvent.ACTION_MOVE:
  createRandomPoints();
  invalidate();
  break;
  case MotionEvent.ACTION_UP:
  if(getDistance(mTouchPoint.x,mTouchPoint.y,mStartPoint.x,mStartPoint.y) >= 
   UNLOCK_DISTANCE)
   Global.Broadcast(getContext(),"");
  break;
  case MotionEvent.ACTION_CANCEL:
  if(getDistance(mTouchPoint.x,mTouchPoint.y,mStartPoint.x,mStartPoint.y) >=
   UNLOCK_DISTANCE)
   Global.Broadcast(getContext(),"");
  break;
  default:
  break;
 }
 return true;
 }