//圆的颜色
  //圆的背景色
  //水波纹的颜色
  //字体的大小
   //字体的颜色

TypedArray ta = context.obtainStyledAttributes(attrs,R.styleable.custom_wave_view_attr);
//圆的颜色
circle_color = ta.getColor(R.styleable.custom_wave_view_attr_circle_color,getResources().getColor(android.R.color.black));
//圆的背景色
circle_bg_color = ta.getColor(R.styleable.custom_wave_view_attr_circle_background_color,getResources().getColor(android.R.color.white));
//水波纹颜色
wave_color = ta.getColor(R.styleable.custom_wave_view_attr_progress_wave_color,getResources().getColor(android.R.color.holo_blue_dark));
//字体的颜色
text_color = ta.getColor(R.styleable.custom_wave_view_attr_progress_text_color,getResources().getColor(android.R.color.black));
//字体的大小
textSize = ta.getDimension(R.styleable.custom_wave_view_attr_progress_text_size,30f);
//释放资源
ta.recycle();

//初始化背景圆画笔
mBgCirclePaint = new Paint();
//抗锯齿
mBgCirclePaint.setAntiAlias(true);
//设置背景圆的背景色
mBgCirclePaint.setColor(circle_bg_color);
//设置充满
mBgCirclePaint.setStyle(Paint.Style.FILL);
//初始化水波纹画笔
mWavePaint = new Paint();
//抗锯齿
mWavePaint.setAntiAlias(true);
//设置水波纹的背景色
mWavePaint.setColor(wave_color);
//设置充满
mWavePaint.setStyle(Paint.Style.FILL);
//使用Xfermode获取重叠部分
mWavePaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));

/**
* 初始化贝塞尔曲线上的点
*/
private void reset() {
 startP = new PointF(-width, height);
 nextP = new PointF(-width/2, height);
 threeP = new PointF(0, height);
 fourP = new PointF(width/2, height);
 endP = new PointF(width, height);
 controllerP1 = new PointF(-width/4, height);
 controllerP2 = new PointF(-width * 3/4, height);
 controllerP3 = new PointF(width/4, height);
 controllerP4 = new PointF(width * 3/4, height);
}

@Override
protected void onDraw(Canvas canvas) {
 super.onDraw(canvas);
 //在透明画布上画背景圆
 mCanvas.drawCircle(width/2, height/2, radius, mBgCirclePaint);
 //贝塞尔曲线
 mPath.reset();
 mPath.moveTo(startP.x, startP.y);
 mPath.quadTo(controllerP1.x, controllerP1.y, nextP.x, nextP.y);
 mPath.quadTo(controllerP2.x, controllerP2.y, threeP.x, threeP.y);
 mPath.quadTo(controllerP3.x, controllerP3.y, fourP.x, fourP.y);
 mPath.quadTo(controllerP4.x, controllerP4.y, endP.x, endP.y);
 mPath.lineTo(endP.x, height);
 mPath.lineTo(-width, height);
 //在透明画布上绘制水波纹
 mCanvas.drawPath(mPath,mWavePaint);
 //将画好的圆绘制在画布上
 canvas.drawBitmap(mBitmap, 0, 0, null);
}

/**
* 开始动画 让startP的x点坐标在2S时间内循环移动到0点。
* depth---进度
* waveRipple----水波纹的振幅
*/
private void startAnimator() {
 animator = ValueAnimator.ofFloat(startP.x, 0);
 animator.setInterpolator(new LinearInterpolator());
 animator.setDuration(2000);
 //重复循环
 animator.setRepeatCount(ValueAnimator.INFINITE);
 animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
 @Override
 public void onAnimationUpdate(ValueAnimator animation) {
 startP.x = (Float) animation.getAnimatedValue();
 startP = new PointF(startP.x, height - depth);
 nextP = new PointF(startP.x + width/2, height - depth);
 threeP = new PointF(nextP.x + width/2, height - depth);
 fourP = new PointF(threeP.x + width/2, height - depth);
 endP = new PointF(fourP.x + width/2, height - depth);
 controllerP1 = new PointF(startP.x + width/4, height - depth + waveRipple);
 controllerP2 = new PointF(nextP.x + width/4, height - depth - waveRipple);
 controllerP3 = new PointF(threeP.x + width/4, height - depth + waveRipple);
 controllerP4 = new PointF(fourP.x + width/4, height - depth - waveRipple);
 invalidate();
 }
 });
 animator.start();
}