Android水波纹载入控件CircleWaterWaveView使用详解

/**
 * 绘制图像
 *
 * @author luxun
*/
  private void drawCanvas(Canvas canvas) {
    if (canvas == null)
      return;
    //画背景圆圈
    canvas.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG));
    canvas.drawCircle(mCenterPoint.x, mCenterPoint.y, mOutRadius, mOutCirclePaint);
    canvas.drawCircle(mCenterPoint.x, mCenterPoint.y, mRadius, mCirclePaint);
    if (mStart) {
      //计算正弦曲线的路径
      int mH = mCenterPoint.y + mRadius - mCurrentHight;
      int length = 2 * mOutRadius;
      Path path = new Path();
      path.moveTo(0, mH);
      for (int i = 0; i < length; i++) {
        int x = i;
        int y = (int) (Math.sin(Math.toRadians(x + mTranX) / amplitude) * mRadius / increase);
        path.lineTo(x, mH + y);
      }
      path.lineTo(length, mH);
      path.lineTo(length, mCenterPoint.y + mRadius);
      path.lineTo(0, mCenterPoint.y + mRadius);
      path.lineTo(0, mH);
      canvas.save();//保存画布状态
      //这里与圆形取交集，除去正弦曲线多画的部分
      Path pc = new Path();
      pc.addCircle(mCenterPoint.x, mCenterPoint.y, mRadius, Path.Direction.CCW);
      canvas.clipPath(pc, Region.Op.INTERSECT);//切割画布
      canvas.drawPath(path, mWaterPaint);
      //绘制文字
      canvas.drawText(flowNum + "%", mCenterPoint.x, mCenterPoint.y + mTextSise / 2, mTextPaint);
      canvas.restore();//恢复画布状态
    }
  }

 /**
   * 绘制界面的线程
   *
   * @author luxun
 */
  private class RenderThread implements Runnable {
    @Override
    public void run() {
      // 不停绘制界面，这里是异步绘制，不采用外部通知开启绘制的方式，水波根据数据更新才会开始增长
      while (isDrawing) {
        if (mWaterTaget > mCurrentHight) {
          mCurrentHight = mCurrentHight + mUpSpeed;
          if (mWaterTaget <= mCurrentHight) {
            mCurrentHight = mWaterTaget;
          }
        }
        if (mStart) {
          if (mTranX > mRadius) {
            mTranX = 0;
          }
          mTranX -= mWaterSpeed;
        }
        drawUI();
        SystemClock.sleep(25);//控制刷新速率，减少cpu占用
      }
    }
  }

@Override
  public void surfaceCreated(SurfaceHolder surfaceHolder) {
    isDrawing = true;
    new Thread(renderThread).start();
  }

  @Override
  public void surfaceChanged(SurfaceHolder surfaceHolder, int format, int width, int height) {
    int minLength = Math.min(width, height);
    mOutRadius = minLength / 2;
    mRadius = (int) (0.5 * (minLength - mOutStrokeWidth));
    mCenterPoint = new Point(minLength / 2, minLength / 2);
    if (progress != 0) {
      setProgress(progress);
    }
  }

  @Override
  public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
    isDrawing = false;
  }

app:textColor="#00ff00"
app:waterColor="#00ff00"
app:strokeColor="#00ff00"
app:backgroudColor="#00ff00"
app:amplitude="1.0"[水波振幅]
app:max="1000"
app:progress="500"
app:increase="6.0"[水波涨幅]
app:upSpeed="3"[上涨速度]
app:waterSpeed="8"[移动速度]
app:strokeSize="4dp"
app:textSize="20dp"