//生成验证码Path
 private void createCaptchaPath() {
 //原本打算随机生成gap，后来发现 宽度/3 效果比较好，
 int gap = mRandom.nextInt(mCaptchaWidth / 2);
 gap = mCaptchaWidth / 3;
 //随机生成验证码阴影左上角 x y 点，
 mCaptchaX = mRandom.nextInt(mWidth - mCaptchaWidth - gap);
 mCaptchaY = mRandom.nextInt(mHeight - mCaptchaHeight - gap);
 mCaptchaPath.reset();
 mCaptchaPath.lineTo(0, 0);
 //从左上角开始 绘制一个不规则的阴影
 mCaptchaPath.moveTo(mCaptchaX, mCaptchaY);//左上角
 mCaptchaPath.lineTo(mCaptchaX + gap, mCaptchaY);
 //draw一个随机凹凸的圆
 drawPartCircle(new PointF(mCaptchaX + gap, mCaptchaY),
 new PointF(mCaptchaX + gap * 2, mCaptchaY),
 mCaptchaPath, mRandom.nextBoolean());
 mCaptchaPath.lineTo(mCaptchaX + mCaptchaWidth, mCaptchaY);//右上角
 mCaptchaPath.lineTo(mCaptchaX + mCaptchaWidth, mCaptchaY + gap);
 //draw一个随机凹凸的圆
 drawPartCircle(new PointF(mCaptchaX + mCaptchaWidth, mCaptchaY + gap),
 new PointF(mCaptchaX + mCaptchaWidth, mCaptchaY + gap * 2),
 mCaptchaPath, mRandom.nextBoolean());
 mCaptchaPath.lineTo(mCaptchaX + mCaptchaWidth, mCaptchaY + mCaptchaHeight);//右下角
 mCaptchaPath.lineTo(mCaptchaX + mCaptchaWidth - gap, mCaptchaY + mCaptchaHeight);
 //draw一个随机凹凸的圆
 drawPartCircle(new PointF(mCaptchaX + mCaptchaWidth - gap, mCaptchaY + mCaptchaHeight),
 new PointF(mCaptchaX + mCaptchaWidth - gap * 2, mCaptchaY + mCaptchaHeight),
 mCaptchaPath, mRandom.nextBoolean());
 mCaptchaPath.lineTo(mCaptchaX, mCaptchaY + mCaptchaHeight);//左下角
 mCaptchaPath.lineTo(mCaptchaX, mCaptchaY + mCaptchaHeight - gap);
 //draw一个随机凹凸的圆
 drawPartCircle(new PointF(mCaptchaX, mCaptchaY + mCaptchaHeight - gap),
 new PointF(mCaptchaX, mCaptchaY + mCaptchaHeight - gap * 2),
 mCaptchaPath, mRandom.nextBoolean());
 mCaptchaPath.close();
 }

/**
 * 传入起点、终点 坐标、凹凸和Path。
 * 会自动绘制凹凸的半圆弧
 *
 * @param start 起点坐标
 * @param end 终点坐标
 * @param path 半圆会绘制在这个path上
 * @param outer 是否凸半圆
 */
 public static void drawPartCircle(PointF start, PointF end, Path path, boolean outer) {
 float c = 0.551915024494f;
 //中点
 PointF middle = new PointF(start.x + (end.x - start.x) / 2, start.y + (end.y - start.y) / 2);
 //半径
 float r1 = (float) Math.sqrt(Math.pow((middle.x - start.x), 2) + Math.pow((middle.y - start.y), 2));
 //gap值
 float gap1 = r1 * c;
 if (start.x == end.x) {
 //绘制竖直方向的
 //是否是从上到下
 boolean topToBottom = end.y - start.y > 0 ? true : false;
 //以下是我写出了所有的计算公式后推的，不要问我过程，只可意会。
 int flag;//旋转系数
 if (topToBottom) {
 flag = 1;
 } else {
 flag = -1;
 }
 if (outer) {
 //凸的 两个半圆
 path.cubicTo(start.x + gap1 * flag, start.y,
  middle.x + r1 * flag, middle.y - gap1 * flag,
  middle.x + r1 * flag, middle.y);
 path.cubicTo(middle.x + r1 * flag, middle.y + gap1 * flag,
  end.x + gap1 * flag, end.y,
  end.x, end.y);
 } else {
 //凹的 两个半圆
 path.cubicTo(start.x - gap1 * flag, start.y,
  middle.x - r1 * flag, middle.y - gap1 * flag,
  middle.x - r1 * flag, middle.y);
 path.cubicTo(middle.x - r1 * flag, middle.y + gap1 * flag,
  end.x - gap1 * flag, end.y,
  end.x, end.y);
 }
 } else {
 //绘制水平方向的
 //是否是从左到右
 boolean leftToRight = end.x - start.x > 0 ? true : false;
 //以下是我写出了所有的计算公式后推的，不要问我过程，只可意会。
 int flag;//旋转系数
 if (leftToRight) {
 flag = 1;
 } else {
 flag = -1;
 }
 if (outer) {
 //凸 两个半圆
 path.cubicTo(start.x, start.y - gap1 * flag,
  middle.x - gap1 * flag, middle.y - r1 * flag,
  middle.x, middle.y - r1 * flag);
 path.cubicTo(middle.x + gap1 * flag, middle.y - r1 * flag,
  end.x, end.y - gap1 * flag,
  end.x, end.y);
 } else {
 //凹 两个半圆
 path.cubicTo(start.x, start.y + gap1 * flag,
  middle.x - gap1 * flag, middle.y + r1 * flag,
  middle.x, middle.y + r1 * flag);
 path.cubicTo(middle.x + gap1 * flag, middle.y + r1 * flag,
  end.x, end.y + gap1 * flag,
  end.x, end.y);
 }
/*
 没推导之前的公式在这里
 if (start.x < end.x) {
 if (outer) {
  //上左半圆 顺时针
  path.cubicTo(start.x, start.y - gap1,
  middle.x - gap1, middle.y - r1,
  middle.x, middle.y - r1);
  //上右半圆:顺时针
  path.cubicTo(middle.x + gap1, middle.y - r1,
  end.x, end.y - gap1,
  end.x, end.y);
 } else {
  //下左半圆 逆时针
  path.cubicTo(start.x, start.y + gap1,
  middle.x - gap1, middle.y + r1,
  middle.x, middle.y + r1);
  //下右半圆 逆时针
  path.cubicTo(middle.x + gap1, middle.y + r1,
  end.x, end.y + gap1,
  end.x, end.y);
 }
 } else {
 if (outer) {
  //下右半圆 顺时针
  path.cubicTo(start.x, start.y + gap1,
  middle.x + gap1, middle.y + r1,
  middle.x, middle.y + r1);
  //下左半圆 顺时针
  path.cubicTo(middle.x - gap1, middle.y + r1,
  end.x, end.y + gap1,
  end.x, end.y);
 }
 }*/
 }
 }

 //生成滑块
 private void craeteMask() {
 mMaskBitmap = getMaskBitmap(((BitmapDrawable) getDrawable()).getBitmap(), mCaptchaPath);
 //滑块阴影
 mMaskShadowBitmap = mMaskBitmap.extractAlpha();
 //拖动的位移重置
 mDragerOffset = 0;
 //isDrawMask 绘制失败闪烁动画用
 isDrawMask = true;
 }
 //抠图
 private Bitmap getMaskBitmap(Bitmap mBitmap, Path mask) {
 //以控件宽高 create一块bitmap
 Bitmap tempBitmap = Bitmap.createBitmap(mWidth, mHeight, Bitmap.Config.ARGB_8888);
 //把创建的bitmap作为画板
 Canvas mCanvas = new Canvas(tempBitmap);
 //有锯齿 且无法解决,所以换成XFermode的方法做
 //mCanvas.clipPath(mask);
 // 抗锯齿
 mCanvas.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG));
 //绘制用于遮罩的圆形
 mCanvas.drawPath(mask, mMaskPaint);
 //设置遮罩模式(图像混合模式)
 mMaskPaint.setXfermode(mPorterDuffXfermode);
 //★考虑到scaleType等因素，要用Matrix对Bitmap进行缩放
 mCanvas.drawBitmap(mBitmap, getImageMatrix(), mMaskPaint);
 mMaskPaint.setXfermode(null);
 return tempBitmap;
 }

 @Override
 protected void onDraw(Canvas canvas) {
 super.onDraw(canvas);
 //继承自ImageView，所以Bitmap，ImageView已经帮我们draw好了。
 //我只在上面绘制和验证码相关的部分，
 //是否处于验证模式，在验证成功后 为false，其余情况为true
 if (isMatchMode) {
 //首先绘制验证码阴影
 if (mCaptchaPath != null) {
 canvas.drawPath(mCaptchaPath, mPaint);
 }
 //绘制滑块
 // isDrawMask 绘制失败闪烁动画用
 if (null != mMaskBitmap && null != mMaskShadowBitmap && isDrawMask) {
 // 先绘制阴影
 canvas.drawBitmap(mMaskShadowBitmap, -mCaptchaX + mDragerOffset, 0, mMaskShadowPaint);
 canvas.drawBitmap(mMaskBitmap, -mCaptchaX + mDragerOffset, 0, null);
 }
 //验证成功，白光扫过的动画，这一块动画感觉不完美，有提高空间
 if (isShowSuccessAnim) {
 canvas.translate(mSuccessAnimOffset, 0);
 canvas.drawPath(mSuccessPath, mSuccessPaint);
 }
 }
 }

mPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG);
 mPaint.setColor(0x77000000);
 //mPaint.setStyle(Paint.Style.STROKE);
 // 设置画笔遮罩滤镜
 mPaint.setMaskFilter(new BlurMaskFilter(20, BlurMaskFilter.Blur.SOLID));

mSuccessPaint = new Paint();
 mSuccessPaint.setShader(new LinearGradient(0, 0, width, 0, new int[]{
 0x11ffffff, 0x88ffffff}, null,
 Shader.TileMode.MIRROR));
 //模仿斗鱼 是一个平行四边形滚动过去
 mSuccessPath = new Path();
 mSuccessPath.moveTo(0, 0);
 mSuccessPath.rLineTo(width, 0);
 mSuccessPath.rLineTo(width / 2, mHeight);
 mSuccessPath.rLineTo(-width, 0);
 mSuccessPath.close();

 /**
 * 重置验证码滑动距离,(一般用于验证失败)
 */
 public void resetCaptcha() {
 mDragerOffset = 0;
 invalidate();
 }
 /**
 * 最大可滑动值
 * @return
 */
 public int getMaxSwipeValue() {
 //return ((BitmapDrawable) getDrawable()).getBitmap().getWidth() - mCaptchaWidth;
 //返回控件宽度
 return mWidth - mCaptchaWidth;
 }
 /**
 * 设置当前滑动值
 * @param value
 */
 public void setCurrentSwipeValue(int value) {
 mDragerOffset = value;
 invalidate();
 }

public interface OnCaptchaMatchCallback {
 void matchSuccess(SwipeCaptchaView swipeCaptchaView);
 void matchFailed(SwipeCaptchaView swipeCaptchaView);
 }
 /**
 * 验证码验证的回调
 */
 private OnCaptchaMatchCallback onCaptchaMatchCallback;
 public OnCaptchaMatchCallback getOnCaptchaMatchCallback() {
 return onCaptchaMatchCallback;
 }
 /**
 * 设置验证码验证回调
 *
 * @param onCaptchaMatchCallback
 * @return
 */
 public SwipeCaptchaView setOnCaptchaMatchCallback(OnCaptchaMatchCallback onCaptchaMatchCallback) {
 this.onCaptchaMatchCallback = onCaptchaMatchCallback;
 return this;
 }
 /**
 * 校验
 */
 public void matchCaptcha() {
 if (null != onCaptchaMatchCallback && isMatchMode) {
 //这里验证逻辑，是通过比较，拖拽的距离 和 验证码起点x坐标。 默认3dp以内算是验证成功。
 if (Math.abs(mDragerOffset - mCaptchaX) < mMatchDeviation) {
 //成功的动画
 mSuccessAnim.start();
 } else {
 mFailAnim.start();
 }
 }
 }

//验证动画初始化区域
 private void createMatchAnim() {
 mFailAnim = ValueAnimator.ofFloat(0, 1);
 mFailAnim.setDuration(100)
 .setRepeatCount(4);
 mFailAnim.setRepeatMode(ValueAnimator.REVERSE);
 //失败的时候先闪一闪动画 斗鱼是 隐藏-显示 -隐藏 -显示
 mFailAnim.addListener(new AnimatorListenerAdapter() {
 @Override
 public void onAnimationEnd(Animator animation) {
 onCaptchaMatchCallback.matchFailed(SwipeCaptchaView.this);
 }
 });
 mFailAnim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
 @Override
 public void onAnimationUpdate(ValueAnimator animation) {
 float animatedValue = (float) animation.getAnimatedValue();
 if (animatedValue < 0.5f) {
  isDrawMask = false;
 } else {
  isDrawMask = true;
 }
 invalidate();
 }
 });
 int width = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 100, getResources().getDisplayMetrics());
 mSuccessAnim = ValueAnimator.ofInt(mWidth + width, 0);
 mSuccessAnim.setDuration(500);
 mSuccessAnim.setInterpolator(new FastOutLinearInInterpolator());
 mSuccessAnim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
 @Override
 public void onAnimationUpdate(ValueAnimator animation) {
 mSuccessAnimOffset = (int) animation.getAnimatedValue();
 invalidate();
 }
 });
 mSuccessAnim.addListener(new AnimatorListenerAdapter() {
 @Override
 public void onAnimationStart(Animator animation) {
 isShowSuccessAnim = true;
 }
 @Override
 public void onAnimationEnd(Animator animation) {
 onCaptchaMatchCallback.matchSuccess(SwipeCaptchaView.this);
 isShowSuccessAnim = false;
 isMatchMode = false;
 }
 });
 mSuccessPaint = new Paint();
 mSuccessPaint.setShader(new LinearGradient(0, 0, width, 0, new int[]{
 0x11ffffff, 0x88ffffff}, null,
 Shader.TileMode.MIRROR));
 //模仿斗鱼 是一个平行四边形滚动过去
 mSuccessPath = new Path();
 mSuccessPath.moveTo(0, 0);
 mSuccessPath.rLineTo(width, 0);
 mSuccessPath.rLineTo(width / 2, mHeight);
 mSuccessPath.rLineTo(-width, 0);
 mSuccessPath.close();
 }

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
 ......
>
 <com.mcxtzhang.captchalib.SwipeCaptchaView
 android:id="@+id/swipeCaptchaView"
 android:layout_width="300dp"
 android:layout_height="150dp"
 android:layout_centerHorizontal="true"
 android:scaleType="centerCrop"
 android:src="@drawable/pic11"
 app:captchaHeight="30dp"
 app:captchaWidth="30dp"/>
 <SeekBar
 android:id="@+id/dragBar"
 android:layout_width="320dp"
 android:layout_height="60dp"
 android:layout_below="@id/swipeCaptchaView"
 android:layout_centerHorizontal="true"
 android:layout_marginTop="30dp"
 android:progressDrawable="@drawable/dragbg"
 android:thumb="@drawable/thumb_bg"/>
 <Button
 android:id="@+id/btnChange"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_alignParentRight="true"
 android:text="老板换码"/>
</RelativeLayout>

public class MainActivity extends AppCompatActivity {
 SwipeCaptchaView mSwipeCaptchaView;
 SeekBar mSeekBar;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 mSwipeCaptchaView = (SwipeCaptchaView) findViewById(R.id.swipeCaptchaView);
 mSeekBar = (SeekBar) findViewById(R.id.dragBar);
 findViewById(R.id.btnChange).setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 mSwipeCaptchaView.createCaptcha();
 mSeekBar.setEnabled(true);
 mSeekBar.setProgress(0);
 }
 });
 mSwipeCaptchaView.setOnCaptchaMatchCallback(new SwipeCaptchaView.OnCaptchaMatchCallback() {
 @Override
 public void matchSuccess(SwipeCaptchaView swipeCaptchaView) {
 Toast.makeText(MainActivity.this, "恭喜你啊 验证成功 可以搞事情了", Toast.LENGTH_SHORT).show();
 mSeekBar.setEnabled(false);
 }
 @Override
 public void matchFailed(SwipeCaptchaView swipeCaptchaView) {
 Toast.makeText(MainActivity.this, "你有80%的可能是机器人，现在走还来得及", Toast.LENGTH_SHORT).show();
 swipeCaptchaView.resetCaptcha();
 mSeekBar.setProgress(0);
 }
 });
 mSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
 @Override
 public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
 mSwipeCaptchaView.setCurrentSwipeValue(progress);
 }
 @Override
 public void onStartTrackingTouch(SeekBar seekBar) {
 //随便放这里是因为控件
 mSeekBar.setMax(mSwipeCaptchaView.getMaxSwipeValue());
 }
 @Override
 public void onStopTrackingTouch(SeekBar seekBar) {
 Log.d("zxt", "onStopTrackingTouch() called with: seekBar = [" + seekBar + "]");
 mSwipeCaptchaView.matchCaptcha();
 }
 });
 //从网络加载图片也ok
 Glide.with(this)
 .load("http://www.investide.cn/data/edata/image/20151201/20151201180507_281.jpg")
 .asBitmap()
 .into(new SimpleTarget<Bitmap>() {
  @Override
  public void onResourceReady(Bitmap resource, GlideAnimation<? super Bitmap> glideAnimation) {
  mSwipeCaptchaView.setImageBitmap(resource);
  mSwipeCaptchaView.createCaptcha();
  }
 });
 }
}