android在指定时间内匀速画一条直线

最新推荐文章于 2021-12-10 16:15:14 发布

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最新推荐文章于 2021-12-10 16:15:14 发布

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分类专栏： android 文章标签： android 自定义view

本文链接：https://blog.youkuaiyun.com/meetings/article/details/78853114

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1.效果图：

2.自定义view实现

public class UniformLine extends View {
    private int x, y, nextX, nextY, incrementY, incrementX;

    public UniformLine(Context context) {
        super(context);
    }

    public UniformLine(Context context, int x, int y, int nextX, int nextY) {
        super(context);
        this.x = x;
        this.y = y;
        this.nextX = nextX;
        this.nextY = nextY;
        init();
    }

    private void init() {
        p = new Paint();
        p.setColor(Color.WHITE);
        p.setAntiAlias(true);
        p.setStrokeWidth(4.0f);


        ValueAnimator valueAnimatorX = ValueAnimator.ofFloat(x, nextX);
        valueAnimatorX.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                incrementX =  Math.round((Float) animation.getAnimatedValue());
                invalidate();
            }
        });

        ValueAnimator valueAnimatorY = ValueAnimator.ofInt(y, nextY);
        valueAnimatorY.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                incrementY = (int) animation.getAnimatedValue();
                invalidate();
            }
        });

        AnimatorSet animatorSet = new AnimatorSet();
        LinearInterpolator ll = new LinearInterpolator();
        animatorSet.setInterpolator(ll);//匀速
        animatorSet.setDuration(2000);
        animatorSet.playTogether(valueAnimatorX, valueAnimatorY);
        animatorSet.start();
    }


    Paint p;


    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        canvas.drawLine(Util.Div(Math.round(x)), Util.Div(Math.round(y)),
                Util.Div(Math.round(incrementX)), Util.Div(Math.round(incrementY)), p);// 斜线

    }

}

3.调用

    uniformLine = new UniformLine(mContext, 300, 500, 600, 200);
    addView(uniformLine);