简单的自定义带有动画的checkbox

android自带的checkbox交互体验不好点击一下干巴巴的难看，很早就写了一个demo现在贴上来。
没必要解释很简单了

public class RightView extends View implements View.OnClickListener,ValueAnimator.AnimatorUpdateListener{    private Paint borderPaint;    private float paintWidth=5;    private int animDuration=200;    private int selectColor=Color.RED;    private int unselectColor=Color.GRAY;    private boolean pressed=false;    Path pathLine,dst1;    PathMeasure pathMeasure;    ValueAnimator animator;    private RightViewSelectListener listener;    float v1;    public RightView(Context context) {        this(context,null);    }    public RightView(Context context, @Nullable AttributeSet attrs) {        this(context, attrs,0);    }    public RightView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init();        setOnClickListener(this);    }    private void init() {        setBackgroundColor(Color.WHITE);        borderPaint=new Paint();        borderPaint.setStyle(Paint.Style.STROKE);        borderPaint.setAntiAlias(true);        pathLine=new Path();        dst1=new Path();        pathMeasure=new PathMeasure();        animator=ValueAnimator.ofFloat(0,1);        animator.setDuration(animDuration);        animator.setInterpolator(new DecelerateInterpolator());        animator.addUpdateListener(this);    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);        setMeasuredDimension(measureDimension(widthMeasureSpec),measureDimension(heightMeasureSpec));    }    private int measureDimension(int ms){        int result;        int measureMode=MeasureSpec.getMode(ms);        int measureSize=MeasureSpec.getSize(ms);        if(measureMode==MeasureSpec.EXACTLY){            result=measureSize;        }else {            result=20;            if(measureMode==MeasureSpec.AT_MOST){                result=Math.max(result,measureSize);            }        }        return result;    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        Rect rect=new Rect(0,0,getWidth(),getHeight());        if(!pressed){            borderPaint.setColor(unselectColor);        }else{            //点击之后            borderPaint.setStrokeWidth(paintWidth/2);            borderPaint.setColor(selectColor);            pathLine.moveTo(20, (float) (getHeight()*2.0/3));            pathLine.lineTo((float) (getWidth()*1.0/3),getHeight()-20);            pathLine.lineTo(getWidth()-20, (float) (getHeight()*1.0/3));            pathMeasure.setPath(pathLine,false);            pathMeasure.getSegment(0,v1*pathMeasure.getLength(),dst1,true);            canvas.drawPath(dst1,borderPaint);            dst1.reset();        }        borderPaint.setStrokeWidth(paintWidth);        canvas.drawRect(rect,borderPaint);//边框    }    @Override    public void onClick(View v) {        if(pressed){            pressed=false;            invalidate();        }else{            pressed=true;            animator.start();        }        if(listener!=null){            listener.onSelect(pressed);        }    }    @Override    public void onAnimationUpdate(ValueAnimator animation) {        if(animation.equals(animation)){            v1= ((float) animation.getAnimatedValue());            invalidate();        }    }    public boolean getState(){        return pressed;    }    public void setRightViewSelectListener(RightViewSelectListener l){        listener=l;    }    interface RightViewSelectListener{        void onSelect(boolean select);    }}

这里是xml

  <com.sofang.lxm.viewevent.RightView        android:layout_width="50dp"        android:layout_height="50dp" />