Android自定义view之path类描绘二阶贝塞尔曲线+属性动画(模仿QQ账号信息曲线动画)

于 2016-12-13 10:31:57 发布
阅读量1.4k 收藏 2
点赞数 3
CC 4.0 BY-SA版权
分类专栏： Android 文章标签： path 二阶贝塞尔曲线 自定义view 属性动画 android
版权声明：本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。
本文链接：https://blog.youkuaiyun.com/dailog/article/details/53606970
本文介绍如何在Android中使用Path类绘制二阶贝塞尔曲线，并结合属性动画模仿QQ账号信息曲线动画。通过调整控制点，可以改变贝塞尔曲线的形态。

摘要生成于 C知道 ，由 DeepSeek-R1 满血版支持， 前往体验 >

写之前先简单的介绍一下后面代码中用到二阶贝塞尔曲线,Bézier curve(贝塞尔曲线)是应用于二维图形应用程序的数学曲线。曲线定义：起始点、终止点（也称锚点）、控制点。通过调整控制点，贝塞尔曲线的形状会发生化。

/**
     * 二阶贝塞尔曲线
     * B(t)=(1-t)*(1-t)*p0+2t(1-t)*p1+t*t*p2
     */
    private int getCurvePoint(int start, int control, int end) {
        return (int) ((1.0 - t) * (1.0 - t) * start + 2.0 * t * (1.0 - t) * control + t * t * end);
    }

设置二阶贝塞尔曲线的方法： 
moveTo(float x,float y)  
其中x,y的坐标代表图中曲线左边起点的位置坐标 
quadTo(float x1, float y1, float x2, float y2 ) 
其中x1,y1的坐标就是图中小圆点的位置，也就是控制点的坐标 
x2,y2的坐标就是图中曲线右边终点的位置坐标

在代码中具体实现如下: 
 mPath = new Path();
        startX = 0;
        startY = getHeight() / 2 + 100;
        mPath.moveTo(startX, startY);
        controlX = getWidth() / 2 + 300;
        controlY = getHeight() / 2 + 100;
        endX = getWidth() + 100;
        endY = 0;
        mPath.quadTo(controlX, controlY, endX, endY);
        canvas.drawPath(mPath, mPaint);
我们具体要实现的效果图

上述代码描绘的曲线:

用一个类来记录头像的坐标位置: 
public class TheCoordinate {
    private int coordinateX;
    private int coordinateY;

    public int getCoordinateX() {
        return coordinateX;
    }

    public void setCoordinateX(int coordinateX) {
        this.coordinateX = coordinateX;
    }

    public int getCoordinateY() {
        return coordinateY;
    }

    public void setCoordinateY(int coordinateY) {
        this.coordinateY = coordinateY;
    }
}

记录四个头像的位置: 
public void addView(int vNum) {
        Log.e("test", 1 + "");
        for (int i = 0; i < VIEWNUM; i++) {
            t = ((double) i) / ((double) VIEWNUM);
            int x = getCurvePoint(startX, controlX, endX);
            int y = getCurvePoint(startY, controlY, endY);
            TheCoordinate coordinate = new TheCoordinate();
            coordinate.setCoordinateX(x);
            coordinate.setCoordinateY(y);
            mList.add(coordinate);
            Log.e("test" + i + "", "t:" + t + "x:" + x + "y:" + y);
        }
        initImageView(mList);
    }
添加图片View: 
private void initImageView(List<TheCoordinate> list) {
        for (int i = 0; i < list.size(); i++) {
            ImageView imageView = new ImageView(getContext());
            RelativeLayout.LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
            params.width = VIEWWIDTH;
            params.height = VIEWHEIGHT;
            if (i < 4) {
                if (i == 0) {
                    params.setMargins(list.get(i).getCoordinateX(), list.get(i).getCoordinateY() - params.height / 2, list.get(i).getCoordinateX() + params.width, list.get(i).getCoordinateY() + params.height);
                } else {
                    params.setMargins(list.get(i).getCoordinateX() - params.width / 2, list.get(i).getCoordinateY() - params.height / 2, list.get(i).getCoordinateX() + params.width, list.get(i).getCoordinateY() + params.height);
                }
                imageView.setBackgroundColor(Color.WHITE);
                imageView.setLayoutParams(params);
                imageView.setId(i);
                imageView.setScaleType(ImageView.ScaleType.FIT_XY);
                imageView.setImageResource(R.mipmap.amap_location_pressed);
                this.addView(imageView);
            }
            iList.add(imageView);
        }
    }
给View添加点击事件: 
private void setViewClickEvent() {
        for (int i = 0; i < iList.size(); i++) {
            iList.get(i).setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    Log.e("test", "tag:" + tag + "" + "vid:" + v.getId() + "");
                    clickAnimation(v.getId());
                    tag = v.getId();
                }
            });
        }
        moveView.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                moveViewAnimation();
            }
        });


    }
其中移动头像单独提出来为moveView.先看看效果:


ok,下面附上完整代码和动画代码: 
public class MyCViewLayout extends RelativeLayout {
    private Paint mPaint;
    private Path mPath;
    // 贝赛尔曲线成员变量(起始点，控制（操作点），终止点，3点坐标)
    private int startX, startY, controlX, controlY, endX, endY;
    //添加view的个数
    public static int VIEWNUM = 5;
    //控制坐标平均分的比例的
    private double t;
    //坐标点集合
    private List<TheCoordinate> mList;
    private List<ImageView> iList;
    //移动的view
    private ImageView moveView;
    private int tag = 0;
    private Handler handler;
    public static int VIEWWIDTH;//moveview的宽度
    public static int VIEWHEIGHT;//moveview的高度

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

    public MyCViewLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        mPaint = new Paint();
        mPaint.setAntiAlias(true);
        mPaint.setColor(Color.RED);
        mPaint.setStyle(Paint.Style.STROKE);
        mList = new ArrayList<TheCoordinate>();
        iList = new ArrayList<ImageView>();
        moveView = new ImageView(getContext());
        VIEWWIDTH=dip2px(context,34);
        VIEWHEIGHT=dip2px(context,34);
        moveView.setImageDrawable(getResources().getDrawable(R.mipmap.amap_call_normal));
        handler=new Handler(){
            @Override
            public void handleMessage(Message msg) {
                super.handleMessage(msg);
                if (msg.what==1){
                    firstLoadAniomation();
                }
            }
        };
    }

    public MyCViewLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }
    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        Log.e("test", 2 + "");
        mPath = new Path();
        startX = 0;
        startY = getHeight() / 2 + 100;
        mPath.moveTo(startX, startY);
        controlX = getWidth() / 2 + 300;
        controlY = getHeight() / 2 + 100;
        endX = getWidth() + 100;
        endY = 0;
        mPath.quadTo(controlX, controlY, endX, endY);
        canvas.drawPath(mPath, mPaint);
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        startX = 0;
        startY = getHeight() / 2 + 100;
        controlX = getWidth() / 2 + 300;
        controlY = getHeight() / 2 + 100;
        endX = getWidth() + 100;
        endY = 0;
        addView(4);
        addMoveView(moveView);
        setViewClickEvent();
        this.setBackgroundColor(Color.parseColor("#ffffff"));
        handler.sendEmptyMessageDelayed(1,1500);
    }

    private void setViewClickEvent() {
        for (int i = 0; i < iList.size(); i++) {
            iList.get(i).setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    Log.e("test", "tag:" + tag + "" + "vid:" + v.getId() + "");
                    clickAnimation(v.getId());
                    tag = v.getId();
                }
            });
        }
        moveView.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                moveViewAnimation();
            }
        });


    }

    /**
     * 根据点击的view移动moveview
     *
     * @param vId
     */
    private void clickAnimation(int vId) {
        if (tag == 0 && vId == 1) {
            moveAnimation(mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX() - VIEWWIDTH / 2, mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY());
        }
        if (tag == 0 && vId == 2) {
            moveAnimation(0, 0, mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX() - VIEWWIDTH / 2, mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY(),
                    mList.get(2).getCoordinateX() - mList.get(1).getCoordinateX() - VIEWWIDTH / 2 + mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX(),
                    mList.get(2).getCoordinateY() - mList.get(1).getCoordinateY() + mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY());
        }
        if (tag == 0 && vId == 3) {
            moveAnimation(0, 0, mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX() - VIEWWIDTH / 2, mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY(),
                    mList.get(2).getCoordinateX() - mList.get(1).getCoordinateX() - VIEWWIDTH / 2 + mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX(),
                    mList.get(2).getCoordinateY() - mList.get(1).getCoordinateY() + mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY(),
                    mList.get(3).getCoordinateX() - mList.get(2).getCoordinateX() + mList.get(2).getCoordinateX()
                            - mList.get(1).getCoordinateX() - VIEWWIDTH / 2 + mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX(),
                    mList.get(3).getCoordinateY() - mList.get(2).getCoordinateY() + mList.get(2).getCoordinateY()
                            - mList.get(1).getCoordinateY() + mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY()
            );
        }
        if (tag == 1 && vId == 2) {
            moveAnimation(mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX() - VIEWWIDTH / 2, mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY(),
                    mList.get(2).getCoordinateX() - mList.get(1).getCoordinateX() - VIEWWIDTH / 2 + mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX(),
                    mList.get(2).getCoordinateY() - mList.get(1).getCoordinateY() + mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY());
        }
        if (tag == 2 && vId == 3) {
            moveAnimation(
                    mList.get(2).getCoordinateX() - mList.get(1).getCoordinateX() - VIEWWIDTH / 2 + mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX(),
                    mList.get(2).getCoordinateY() - mList.get(1).getCoordinateY() + mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY(),
                    mList.get(3).getCoordinateX() - mList.get(2).getCoordinateX() + mList.get(2).getCoordinateX()
                            - mList.get(1).getCoordinateX() - VIEWWIDTH / 2 + mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX(),
                    mList.get(3).getCoordinateY() - mList.get(2).getCoordinateY() + mList.get(2).getCoordinateY()
                            - mList.get(1).getCoordinateY() + mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY()
            );
        }
        if (tag == 3 && vId == 0) {
            moveAnimation(
                    mList.get(3).getCoordinateX() - mList.get(2).getCoordinateX() + mList.get(2).getCoordinateX()
                            - mList.get(1).getCoordinateX() - VIEWWIDTH / 2 + mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX(),
                    mList.get(3).getCoordinateY() - mList.get(2).getCoordinateY() + mList.get(2).getCoordinateY()
                            - mList.get(1).getCoordinateY() + mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY(),
                    mList.get(2).getCoordinateX() - mList.get(1).getCoordinateX() - VIEWWIDTH / 2 + mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX(),
                    mList.get(2).getCoordinateY() - mList.get(1).getCoordinateY() + mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY(),
                    mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX() - VIEWWIDTH / 2, mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY(),
                    0, 0
            );
        }
        if (tag == 3 && vId == 1) {
            moveAnimation(
                    mList.get(3).getCoordinateX() - mList.get(2).getCoordinateX() + mList.get(2).getCoordinateX()
                            - mList.get(1).getCoordinateX() - VIEWWIDTH / 2 + mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX(),
                    mList.get(3).getCoordinateY() - mList.get(2).getCoordinateY() + mList.get(2).getCoordinateY()
                            - mList.get(1).getCoordinateY() + mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY(),
                    mList.get(2).getCoordinateX() - mList.get(1).getCoordinateX() - VIEWWIDTH / 2 + mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX(),
                    mList.get(2).getCoordinateY() - mList.get(1).getCoordinateY() + mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY(),
                    mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX() - VIEWWIDTH / 2, mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY()
            );
        }
        if (tag == 3 && vId == 2) {
            moveAnimation(mList.get(3).getCoordinateX() - mList.get(2).getCoordinateX() + mList.get(2).getCoordinateX()
                            - mList.get(1).getCoordinateX() - VIEWWIDTH / 2 + mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX(),
                    mList.get(3).getCoordinateY() - mList.get(2).getCoordinateY() + mList.get(2).getCoordinateY()
                            - mList.get(1).getCoordinateY() + mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY(),
                    mList.get(2).getCoordinateX() - mList.get(1).getCoordinateX() - VIEWWIDTH / 2 + mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX(),
                    mList.get(2).getCoordinateY() - mList.get(1).getCoordinateY() + mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY());
        }
        if (tag == 2 && vId == 1) {
            moveAnimation(
                    mList.get(2).getCoordinateX() - mList.get(1).getCoordinateX() - VIEWWIDTH / 2 + mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX(),
                    mList.get(2).getCoordinateY() - mList.get(1).getCoordinateY() + mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY(),
                    mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX() - VIEWWIDTH / 2, mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY()
            );
        }
        if (tag == 2 && vId == 0) {
            moveAnimation(
                    mList.get(2).getCoordinateX() - mList.get(1).getCoordinateX() - VIEWWIDTH / 2 + mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX(),
                    mList.get(2).getCoordinateY() - mList.get(1).getCoordinateY() + mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY(),
                    mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX() - VIEWWIDTH / 2, mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY(),
                    0, 0
            );
        }
        if (tag == 1 && vId == 0) {
            moveAnimation(
                    mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX() - VIEWWIDTH / 2, mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY(),
                    0, 0
            );
        }
        if (tag == 1 && vId == 3) {
            moveAnimation(mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX() - VIEWWIDTH / 2, mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY(),
                    mList.get(2).getCoordinateX() - mList.get(1).getCoordinateX() - VIEWWIDTH / 2 + mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX(),
                    mList.get(2).getCoordinateY() - mList.get(1).getCoordinateY() + mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY(),
                    mList.get(3).getCoordinateX() - mList.get(2).getCoordinateX() + mList.get(2).getCoordinateX()
                            - mList.get(1).getCoordinateX() - VIEWWIDTH / 2 + mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX(),
                    mList.get(3).getCoordinateY() - mList.get(2).getCoordinateY() + mList.get(2).getCoordinateY()
                            - mList.get(1).getCoordinateY() + mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY()
            );
        }
    }

    private void moveAnimation(int startPointX, int startPointY) {
        ObjectAnimator animatorX = ObjectAnimator.ofFloat(moveView, "TranslationX", 0, startPointX);
        ObjectAnimator animatorY = ObjectAnimator.ofFloat(moveView, "TranslationY", 0, startPointY);
        AnimatorSet set = new AnimatorSet();
        set.setDuration(800);
        set.setInterpolator(new FastOutSlowInInterpolator());
        set.playTogether(animatorX, animatorY);
        set.start();
    }

    private void moveAnimation(int startPointX, int startPointY, int X1, int Y1, int endPointX, int endPointY) {
        Log.e("test", "startPointX:" + startPointX + "startPointY:" + startPointY + "endPointX:" + endPointX + "endPointY:" + endPointY + "");
        ObjectAnimator animatorX = ObjectAnimator.ofFloat(moveView, "TranslationX", startPointX, X1, endPointX);
        ObjectAnimator animatorY = ObjectAnimator.ofFloat(moveView, "TranslationY", startPointY, Y1, endPointY);
        AnimatorSet set = new AnimatorSet();
        set.setDuration(1000);
        set.setInterpolator(new FastOutSlowInInterpolator());
        set.playTogether(animatorX, animatorY);
        set.start();
    }

    private void moveAnimation(int startPointX, int startPointY, int X1, int Y1, int X2, int Y2, int endPointX, int endPointY) {
        Log.e("test", "startPointX:" + startPointX + "startPointY:" + startPointY + "endPointX:" + endPointX + "endPointY:" + endPointY + "");
        ObjectAnimator animatorX = ObjectAnimator.ofFloat(moveView, "TranslationX", startPointX, X1, X2, endPointX);
        ObjectAnimator animatorY = ObjectAnimator.ofFloat(moveView, "TranslationY", startPointY, Y1, Y2, endPointY);
        AnimatorSet set = new AnimatorSet();
        set.setDuration(1000);
        set.setInterpolator(new FastOutSlowInInterpolator());
        set.playTogether(animatorX, animatorY);
        set.start();
    }
    private void moveAnimation(int startPointX, int startPointY, int X1, int Y1, int X2, int Y2, int endPointX, int endPointY,int X3,int Y3,int X4,int Y4) {
        Log.e("test", "startPointX:" + startPointX + "startPointY:" + startPointY + "endPointX:" + endPointX + "endPointY:" + endPointY + "");
        ObjectAnimator animatorX = ObjectAnimator.ofFloat(moveView, "TranslationX", startPointX, X1, X2, endPointX,X3,X4,0);
        ObjectAnimator animatorY = ObjectAnimator.ofFloat(moveView, "TranslationY", startPointY, Y1, Y2, endPointY,Y3,Y4,0);
        AnimatorSet set = new AnimatorSet();
        set.setDuration(3000);
//        set.setInterpolator(new FastOutSlowInInterpolator());
        set.setInterpolator(new LinearInterpolator());
        set.playTogether(animatorX, animatorY);
        set.start();
    }

    private void moveAnimation(int startPointX, int startPointY, int endPointX, int endPointY) {
        Log.e("test", "startPointX:" + startPointX + "startPointY:" + startPointY + "endPointX:" + endPointX + "endPointY:" + endPointY + "");
        ObjectAnimator animatorX = ObjectAnimator.ofFloat(moveView, "TranslationX", startPointX, endPointX);
        ObjectAnimator animatorY = ObjectAnimator.ofFloat(moveView, "TranslationY", startPointY, endPointY);
        AnimatorSet set = new AnimatorSet();
        set.setDuration(1000);
        set.setInterpolator(new FastOutSlowInInterpolator());
        set.playTogether(animatorX, animatorY);
        set.start();
    }

    private void moveViewAnimation() {
        ObjectAnimator mAnimator = ObjectAnimator.ofFloat(moveView, "rotation", 0F, 720f);
        mAnimator.setDuration(800);
        mAnimator.start();
    }

    @Override
    protected void dispatchDraw(Canvas canvas) {
        super.dispatchDraw(canvas);
    }

    public void addView(int vNum) {
        Log.e("test", 1 + "");
        for (int i = 0; i < VIEWNUM; i++) {
            t = ((double) i) / ((double) VIEWNUM);
            int x = getCurvePoint(startX, controlX, endX);
            int y = getCurvePoint(startY, controlY, endY);
            TheCoordinate coordinate = new TheCoordinate();
            coordinate.setCoordinateX(x);
            coordinate.setCoordinateY(y);
            mList.add(coordinate);
            Log.e("test" + i + "", "t:" + t + "x:" + x + "y:" + y);
        }
        initImageView(mList);
    }

    public void addMoveView(ImageView imageView) {
        RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
        params.width = VIEWWIDTH;
        params.height = VIEWHEIGHT;
        params.setMargins(mList.get(0).getCoordinateX(), mList.get(0).getCoordinateY() - params.height / 2, mList.get(0).getCoordinateX() + params.width, mList.get(0).getCoordinateY() + params.height);
        tag = 0;
        imageView.setLayoutParams(params);
        imageView.setScaleType(ImageView.ScaleType.FIT_XY);
        removeView(imageView);
        this.addView(imageView);

    }

    private void initImageView(List<TheCoordinate> list) {
        for (int i = 0; i < list.size(); i++) {
            ImageView imageView = new ImageView(getContext());
            RelativeLayout.LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
            params.width = VIEWWIDTH;
            params.height = VIEWHEIGHT;
            if (i < 4) {
                if (i == 0) {
                    params.setMargins(list.get(i).getCoordinateX(), list.get(i).getCoordinateY() - params.height / 2, list.get(i).getCoordinateX() + params.width, list.get(i).getCoordinateY() + params.height);
                } else {
                    params.setMargins(list.get(i).getCoordinateX() - params.width / 2, list.get(i).getCoordinateY() - params.height / 2, list.get(i).getCoordinateX() + params.width, list.get(i).getCoordinateY() + params.height);
                }
                imageView.setBackgroundColor(Color.WHITE);
                imageView.setLayoutParams(params);
                imageView.setId(i);
                imageView.setScaleType(ImageView.ScaleType.FIT_XY);
                imageView.setImageResource(R.mipmap.amap_location_pressed);
                this.addView(imageView);
            }
            iList.add(imageView);
        }
    }

    /**
     * 二阶贝塞尔曲线
     * B(t)=(1-t)*(1-t)*p0+2t(1-t)*p1+t*t*p2
     */
    private int getCurvePoint(int start, int control, int end) {
        return (int) ((1.0 - t) * (1.0 - t) * start + 2.0 * t * (1.0 - t) * control + t * t * end);
    }

    /**
     * 根据手机的分辨率从 dp 的单位 转成为 px(像素)
     */
    public static int dip2px(Context context, float dpValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dpValue * scale + 0.5f);
    }

    /**
     * 根据手机的分辨率从 px(像素) 的单位 转成为 dp
     */
    public static int px2dip(Context context, float pxValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (pxValue / scale + 0.5f);
    }
    /**
     * 获取屏幕的宽度
     *
     * @return
     */
    private int getScreenWidth() {
        WindowManager wm = (WindowManager) getContext().getSystemService(
                Context.WINDOW_SERVICE);
        DisplayMetrics outMetrics = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(outMetrics);
        return outMetrics.widthPixels;
    }

    /**
     * 获取屏幕的高度
     *
     * @return
     */
    private int getScreenHeight() {
        WindowManager wm = (WindowManager) getContext().getSystemService(
                Context.WINDOW_SERVICE);
        DisplayMetrics outMetrics = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(outMetrics);
        return outMetrics.heightPixels;
    }
    public void firstLoadAniomation(){
        moveAnimation(
                0, 0, mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX() - VIEWWIDTH / 2, mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY(),
                mList.get(2).getCoordinateX() - mList.get(1).getCoordinateX() - VIEWWIDTH / 2 + mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX(),
                mList.get(2).getCoordinateY() - mList.get(1).getCoordinateY() + mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY(),
                mList.get(3).getCoordinateX() - mList.get(2).getCoordinateX() + mList.get(2).getCoordinateX()
                        - mList.get(1).getCoordinateX() - VIEWWIDTH / 2 + mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX(),
                mList.get(3).getCoordinateY() - mList.get(2).getCoordinateY() + mList.get(2).getCoordinateY()
                        - mList.get(1).getCoordinateY() + mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY(),
                mList.get(2).getCoordinateX() - mList.get(1).getCoordinateX() - VIEWWIDTH / 2 + mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX(),
                mList.get(2).getCoordinateY() - mList.get(1).getCoordinateY() + mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY(),
                mList.get(1).getCoordinateX() - mList.get(0).getCoordinateX() - VIEWWIDTH / 2, mList.get(1).getCoordinateY() - mList.get(0).getCoordinateY()
        );
    }
}
说明一下,动画的坐标由于只是demo就写死了,后续可以提取出来封装一个方法.
that's all .THX!!!



评论 1
添加红包

请填写红包祝福语或标题

个

红包个数最小为10个

元

红包金额最低5元

当前余额3.43元 前往充值 >
需支付：10.00元
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付元
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明：

1.余额是钱包充值的虚拟货币，按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载，可以购买VIP、付费专栏及课程。

余额充值