1 public class CountdownDrawable extends Drawable { 2  3     //画笔 4     private Paint mPaint; 5     private RectF mArcRect; 6      7     //当前进度条进度 8     private float progress; 9     //边框圆颜色10     private int outlineColor;11     //内部背景圆颜色12     private int innerColor;13     //进度条颜色14     private int ringColor;15     //进度条宽度16     private int ringWidth;17     //倒计时数字18     private int showNumber;19     //数字颜色20     private int textColor;21 22     @Override23     public void draw(Canvas canvas) {24         // TODO Auto-generated method stub25         26     }27 28     @Override29     public void setAlpha(int alpha) {30         mPaint.setAlpha(alpha);31     }32 33     @Override34     public void setColorFilter(ColorFilter cf) {35     }36 37     @Override38     public int getOpacity() {39         return mPaint.getAlpha();40     }41 42 }

 1 public CountdownDrawable(int ringWidth, int outlineColor, int innerColor, int ringColor, int showNumber, int textColor) { 2     mPaint = new Paint(); 3     mArcRect = new RectF(); 4          5     this.outlineColor = outlineColor; 6     this.innerColor = innerColor; 7     this.ringColor = ringColor; 8     this.ringWidth = ringWidth; 9     this.showNumber = showNumber;10     this.textColor = textColor;11 }

 1 public void draw(Canvas canvas) { 2     //获取view的边界 3     final Rect bounds = getBounds(); 4          5     int size = bounds.height() > bounds.width() ? bounds.width() : bounds.height(); 6     float outerRadius = ((size / 2) * 0.75f) * 0.937f; 7     float innerRadius = ((size / 2) * 0.75f) * 0.75f; 8     float offsetX = (bounds.width() - outerRadius * 2) / 2; 9     float offsetY = (bounds.height() - outerRadius * 2) / 2;10         11     //画边框圆12     mPaint.setStyle(Paint.Style.STROKE);13     mPaint.setStrokeWidth(1);14     mPaint.setColor(outlineColor);15     canvas.drawCircle(bounds.centerX(), bounds.centerY(), outerRadius, mPaint);16         17     //画内部背景18     mPaint.setStyle(Paint.Style.FILL);19     mPaint.setColor(innerColor);20     canvas.drawCircle(bounds.centerX(), bounds.centerY(), innerRadius, mPaint);21         22     //画倒计时数字23     float textSize = innerRadius * 2 * 0.75f;24     mPaint.setTextSize(textSize);25     mPaint.setTextAlign(Align.CENTER);26     mPaint.setColor(textColor);27     float textX = bounds.centerX();28     float textY = bounds.centerY() - (mPaint.descent() + mPaint.ascent()) / 2; 29     canvas.drawText(Integer.toString(showNumber), textX, textY, mPaint);30         31     //画进度条32     int halfRingWidth = ringWidth / 2;33     float arcX0 = offsetX + halfRingWidth;34     float arcY0 = offsetY + halfRingWidth;35     float arcX = offsetX + outerRadius * 2 - halfRingWidth;36     float arcY = offsetY + outerRadius * 2 - halfRingWidth;37         38     mPaint.setColor(ringColor);39     mPaint.setStyle(Paint.Style.STROKE);40     mPaint.setStrokeWidth(ringWidth);41     mPaint.setStrokeCap(Paint.Cap.ROUND);42     mArcRect.set(arcX0, arcY0, arcX, arcY);43     canvas.drawArc(mArcRect, 89, progress, false, mPaint);44 }

 1 public float getProgress() { 2     return progress / PROGRESS_FACTOR; 3 } 4  5 public void setProgress(float progress) { 6     this.progress = progress * PROGRESS_FACTOR; 7          8     invalidateSelf(); 9 }10 11 public int getShowNumber() {12     return showNumber;13 }14 15 public void setShowNumber(int showNumber) {16     this.showNumber = showNumber;17         18     invalidateSelf();19 }

1 mIv = (ImageView)findViewById(R.id.iv);2 mCdDrawable = new CountdownDrawable(getResources().getDimensionPixelSize(R.dimen.drawable_ring_size),  getResources().getColor(R.color.dark_grey), getResources().getColor(R.color.brightly_grey)3                 , getResources().getColor(R.color.holo_green_light), 5, getResources().getColor(R.color.red));4 mIv.setImageDrawable(mCdDrawable);

1 <dimen name="drawable_ring_size">4dp</dimen>2 3 <color name="dark_grey">#FF54585A</color>4 <color name="holo_green_light">#FF99CC00</color>5 <color name="brightly_grey">#CF9EA2A2</color>6 <color name="red">#FFE61E27</color>

 1 private Animator prepareAnimator() { 2     AnimatorSet animation = new AnimatorSet(); 3          4     // 进度条动画 5     ObjectAnimator progressAnimator = ObjectAnimator.ofFloat(mCdDrawable, "progress", 1f, 0f); 6     progressAnimator.setDuration(5000); 7     progressAnimator.setInterpolator(new LinearInterpolator()); 8     progressAnimator.addListener(new Animator.AnimatorListener() { 9             10         @Override11         public void onAnimationStart(Animator animation) {12                 13         }14             15         @Override16         public void onAnimationRepeat(Animator animation) {17         18         }19             20         @Override21         public void onAnimationEnd(Animator animation) {22             mIv.setVisibility(View.GONE);23         }24             25         @Override26         public void onAnimationCancel(Animator animation) {27             mIv.setVisibility(View.GONE);28         }29     });30         31     // 居中的倒计时数字32     ObjectAnimator showNumberAnimator = ObjectAnimator.ofInt(mCdDrawable, "showNumber", 5, 0);33     showNumberAnimator.setDuration(5000);34     showNumberAnimator.setInterpolator(new LinearInterpolator());35         36     animation.playTogether(progressAnimator, showNumberAnimator);37     return animation;38 }

 1 private View.OnClickListener mBtnOnClickListener = new View.OnClickListener() { 2          3     @Override 4     public void onClick(View v) { 5         if(mAnimator != null) { 6             mAnimator.cancel(); 7         } 8         mIv.setVisibility(View.VISIBLE); 9         mAnimator = prepareAnimator();10         mAnimator.start();11     }12 };