先上个效果图

1.控件主代码

public class SlideView extends View {

    private float width = -1;
    private float height = -1;
    private Paint bluePaint = null;
    private Paint whitePaint = null;
    private Paint textPaint = null;
    private float strokeWidth = 3;
    private float contentBoundary = 10;
    private float btnRadius = -1;
    private float currentX = -1;
    private float minX = -1;
    private float maxX = -1;

    private boolean clicked = false;
    private OnSlideListener listener;


    public SlideView(Context context) {
        this(context, null);
    }

    public SlideView(Context context, AttributeSet attrs) {
        this(context, attrs, -1);
    }

    public SlideView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        bluePaint = new Paint();
        bluePaint.setAntiAlias(true);
        bluePaint.setColor(Color.parseColor("#099CE9"));
        whitePaint = new Paint();
        whitePaint.setAntiAlias(true);
        whitePaint.setColor(Color.parseColor("#FFFFFF"));
        textPaint = new Paint();
        textPaint.setColor(Color.parseColor("#909090"));
        textPaint.setTextSize(26);
        textPaint.setTextAlign(Paint.Align.CENTER);

    }

    public void setOnSlideListener(OnSlideListener listener) {
        this.listener = listener;
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        //根据控件的宽高设置内部数值
        if (width != getMeasuredWidth() || height != getMeasuredHeight()) {
            width = getMeasuredWidth();
            height = getMeasuredHeight();
            btnRadius = (height - (contentBoundary * 2)) / 2;
            minX = contentBoundary + btnRadius;
            maxX = width - contentBoundary - btnRadius;
            currentX = minX;
            invalidate();
        }
    }

    /**
     * 恢复到原始状态
     */
    public void reset() {
        currentX = minX;
        invalidate();
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        getParent().requestDisallowInterceptTouchEvent(true);
        float x = event.getX();
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                if (x >= currentX - btnRadius && x <= currentX + btnRadius) {
                    clicked = true;
                }

                break;
            case MotionEvent.ACTION_MOVE:
                if (!clicked) {
                    return true;
                }
                if (x < minX) {
                    currentX = minX;
                } else if (x > maxX) {
                    currentX = maxX;
                } else {
                    currentX = x;
                }
                invalidate();
                break;
            case MotionEvent.ACTION_UP:
                clicked = false;
                if (listener != null) {
                    if (currentX < maxX) {
                        listener.onCancel(this);
                    } else {
                        listener.onComplete(this);
                    }
                }
                currentX = minX;
                invalidate();
                break;
        }
        return true;
    }


    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        if (width == -1 || height == -1) {
            return;
        }
        canvas.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG
                | Paint.FILTER_BITMAP_FLAG));
        drawRounRect(canvas, 0, 0, width, height, bluePaint);
        drawRounRect(canvas, strokeWidth, strokeWidth, width - strokeWidth, height - strokeWidth, whitePaint);
        drawRounRect(canvas, contentBoundary, contentBoundary, currentX + btnRadius, height - contentBoundary, bluePaint);

    }

    /**
     * 画半圆的矩形
     */
    private void drawRounRect(Canvas canvas, float l, float t, float r, float b, Paint paint) {
        float h2 = (b - t) / 2;
        canvas.drawCircle(l + h2, t + h2, h2, paint);
        canvas.drawCircle(r - h2, t + h2, h2, paint);
        canvas.drawRect(l + h2, t, r - h2, b, paint);
    }

}

2.监听类代码

public interface OnSlideListener {
    void onComplete(View v);

    void onCancel(View v);
}

3.在布局文件中调用控件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <com.sandu.mavenproject.widget.SlideView
        android:id="@+id/slide_view"
        android:layout_width="match_parent"
        android:layout_height="@dimen/px100dp"
        android:layout_marginLeft="@dimen/px30dp"
        android:layout_marginRight="@dimen/px30dp"
        android:layout_marginTop="@dimen/px20dp" />

</RelativeLayout>

4.在activity中设置回调

   SlideView slideView = (SlideView) findViewById(R.id.slide_view);
        slideView.setOnSlideListener(new OnSlideListener() {
            @Override
            public void onComplete(View v) {
                Toast.makeText(MainActivity.this, "滑动成功", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onCancel(View v) {
                Toast.makeText(MainActivity.this, "滑动取消", Toast.LENGTH_SHORT).show();
            }
        });

补充一下
为了解决控件的横向滑动与纵向滑动的冲突，添加了下面代码

  getParent().requestDisallowInterceptTouchEvent(true);