添加购物车控件（增加或减少数字）有动画效果
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最近在做一个关于商城的项目，有一个添加购物车的功能，我们的UI给出来的东西是很好的，效果是很好的，但是完全不考虑我们程序员好不好容易实现，不过在坚持努力下，还是完成了：下面先来看一下效果图片：
话不多说了 下面来看一下实现方式吧：
public class RxShoppingView extends View { private final static int STATE_NONE = 0; private final static int STATE_MOVE = 1; private final static int STATE_MOVE_OVER = 2; private final static int STATE_ROTATE = 3; private final static int STATE_ROTATE_OVER = 4; private final static int DEFAULT_DURATION = 250; private final static String DEFAULT_SHOPPING_TEXT = "加入购物车"; private Paint mPaintBg, mPaintText, mPaintNum; private Paint mPaintMinus; //是否是向前状态（= = 名字不好取，意思就是区分向前和回退状态） private boolean mIsForward = true; //动画时长 private int mDuration; //购买数量 private int mNum = 0; //展示文案 private String mShoppingText; //当前状态 private int mState = STATE_NONE; //属性值 private int mWidth = 0; private int mAngle = 0; private int mTextPosition = 0; private int mMinusBtnPosition = 0; private int mAlpha = 0; private int MAX_WIDTH; private int MAX_HEIGHT; private ShoppingClickListener mShoppingClickListener; public RxShoppingView(Context context) { this(context, null); } public RxShoppingView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public RxShoppingView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(attrs); } private void init(AttributeSet attrs) { TypedArray typeArray = getContext().obtainStyledAttributes(attrs, R.styleable.ShoppingView); mDuration = typeArray.getInt(R.styleable.ShoppingView_sv_duration, DEFAULT_DURATION); mShoppingText = TextUtils.isEmpty(typeArray.getString(R.styleable.ShoppingView_sv_text)) ? DEFAULT_SHOPPING_TEXT : typeArray.getString(R.styleable.ShoppingView_sv_text); //展示文案大小 int textSize = (int) typeArray.getDimension(R.styleable.ShoppingView_sv_text_size, sp2px(16)); //背景色 int bgColor = typeArray.getColor(R.styleable.ShoppingView_sv_bg_color, ContextCompat.getColor(getContext(), R.color.slateblue)); typeArray.recycle(); mPaintBg = new Paint(); mPaintBg.setColor(bgColor); mPaintBg.setStyle(Paint.Style.FILL); mPaintBg.setAntiAlias(true); mPaintMinus = new Paint(); mPaintMinus.setColor(bgColor); mPaintMinus.setStyle(Paint.Style.STROKE); mPaintMinus.setAntiAlias(true); mPaintMinus.setStrokeWidth(textSize / 6); mPaintText = new Paint(); mPaintText.setColor(Color.WHITE); mPaintText.setStrokeWidth(textSize / 6); mPaintText.setTextSize(textSize); mPaintText.setAntiAlias(true); mPaintNum = new Paint(); mPaintNum.setColor(Color.BLACK); mPaintNum.setTextSize(textSize / 3 * 4); mPaintNum.setStrokeWidth(textSize / 6); mPaintNum.setAntiAlias(true); MAX_WIDTH = getTextWidth(mPaintText, mShoppingText) / 5 * 8; MAX_HEIGHT = textSize * 2; if (MAX_WIDTH / (float) MAX_HEIGHT < 3.5) { MAX_WIDTH = (int) (MAX_HEIGHT * 3.5); } mTextPosition = MAX_WIDTH / 2; mMinusBtnPosition = MAX_HEIGHT / 2; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { setMeasuredDimension(MAX_WIDTH, MAX_HEIGHT); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); if (mState == STATE_NONE) { drawBgMove(canvas); drawShoppingText(canvas); } else if (mState == STATE_MOVE) { drawBgMove(canvas); } else if (mState == STATE_MOVE_OVER) { mState = STATE_ROTATE; if (mIsForward) { drawAddBtn(canvas); startRotateAnim(); } else { drawBgMove(canvas); drawShoppingText(canvas); mState = STATE_NONE; mIsForward = true; mNum = 0; } } else if (mState == STATE_ROTATE) { mPaintMinus.setAlpha(mAlpha); mPaintNum.setAlpha(mAlpha); drawMinusBtn(canvas, mAngle); drawNumText(canvas); drawAddBtn(canvas); } else if (mState == STATE_ROTATE_OVER) { drawMinusBtn(canvas, mAngle); drawNumText(canvas); drawAddBtn(canvas); if (!mIsForward) { startMoveAnim(); } } } /** * 绘制移动的背景 * * @param canvas 画板 */ private void drawBgMove(Canvas canvas) { canvas.drawArc(new RectF(mWidth, 0, mWidth + MAX_HEIGHT, MAX_HEIGHT), 90, 180, false, mPaintBg); canvas.drawRect(new RectF(mWidth + MAX_HEIGHT / 2, 0, MAX_WIDTH - MAX_HEIGHT / 2, MAX_HEIGHT), mPaintBg); canvas.drawArc(new RectF(MAX_WIDTH - MAX_HEIGHT, 0, MAX_WIDTH, MAX_HEIGHT), 180, 270, false, mPaintBg); } /** * 绘制购物车文案 * * @param canvas 画板 */ private void drawShoppingText(Canvas canvas) { canvas.drawText(mShoppingText, MAX_WIDTH / 2 - getTextWidth(mPaintText, mShoppingText) / 2f, MAX_HEIGHT / 2 + getTextHeight(mShoppingText, mPaintText) / 2f, mPaintText); } /** * 绘制加号按钮 * * @param canvas 画板 */ private void drawAddBtn(Canvas canvas) { canvas.drawCircle(MAX_WIDTH - MAX_HEIGHT / 2, MAX_HEIGHT / 2, MAX_HEIGHT / 2, mPaintBg); canvas.drawLine(MAX_WIDTH - MAX_HEIGHT / 2, MAX_HEIGHT / 4, MAX_WIDTH - MAX_HEIGHT / 2, MAX_HEIGHT / 4 * 3, mPaintText); canvas.drawLine(MAX_WIDTH - MAX_HEIGHT / 2 - MAX_HEIGHT / 4, MAX_HEIGHT / 2, MAX_WIDTH - MAX_HEIGHT / 4, MAX_HEIGHT / 2, mPaintText); } /** * 绘制减号按钮 * * @param canvas 画板 * @param angle 旋转角度 */ private void drawMinusBtn(Canvas canvas, float angle) { if (angle != 0) { canvas.rotate(angle, mMinusBtnPosition, MAX_HEIGHT / 2); } canvas.drawCircle(mMinusBtnPosition, MAX_HEIGHT / 2, MAX_HEIGHT / 2 - MAX_HEIGHT / 20, mPaintMinus); canvas.drawLine(mMinusBtnPosition - MAX_HEIGHT / 4, MAX_HEIGHT / 2, mMinusBtnPosition + MAX_HEIGHT / 4, MAX_HEIGHT / 2, mPaintMinus); if (angle != 0) { canvas.rotate(-angle, mMinusBtnPosition, MAX_HEIGHT / 2); } } /** * 绘制购买数量 * * @param canvas 画板 */ private void drawNumText(Canvas canvas) { drawText(canvas, String.valueOf(mNum), mTextPosition - getTextWidth(mPaintNum, String.valueOf(mNum)) / 2f, MAX_HEIGHT / 2 + getTextHeight(String.valueOf(mNum), mPaintNum) / 2f, mPaintNum, mAngle); } /** * 绘制Text带角度 * * @param canvas 画板 * @param text 文案 * @param x x坐标 * @param y y坐标 * @param paint 画笔 * @param angle 旋转角度 */ private void drawText(Canvas canvas, String text, float x, float y, Paint paint, float angle) { if (angle != 0) { canvas.rotate(angle, x, y); } canvas.drawText(text, x, y, paint); if (angle != 0) { canvas.rotate(-angle, x, y); } } @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: if (mState == STATE_NONE) { mNum++; startMoveAnim(); if (mShoppingClickListener != null) { mShoppingClickListener.onAddClick(mNum); } } else if (mState == STATE_ROTATE_OVER) { if (isPointInCircle(new PointF(event.getX(), event.getY()), new PointF(MAX_WIDTH - MAX_HEIGHT / 2, MAX_HEIGHT / 2), MAX_HEIGHT / 2)) { if (mNum > 0) { mNum++; mIsForward = true; if (mShoppingClickListener != null) { mShoppingClickListener.onAddClick(mNum); } } invalidate(); } else if (isPointInCircle(new PointF(event.getX(), event.getY()), new PointF(MAX_HEIGHT / 2, MAX_HEIGHT / 2), MAX_HEIGHT / 2)) { if (mNum > 1) { mNum--; if (mShoppingClickListener != null) { mShoppingClickListener.onMinusClick(mNum); } invalidate(); } else { if (mShoppingClickListener != null) { mShoppingClickListener.onMinusClick(0); } mState = STATE_ROTATE; mIsForward = false; startRotateAnim(); } } } return true; } return super.onTouchEvent(event); } /** * 开始移动动画 */ private void startMoveAnim() { mState = STATE_MOVE; ValueAnimator valueAnimator; if (mIsForward) { valueAnimator = ValueAnimator.ofInt(0, MAX_WIDTH - MAX_HEIGHT); } else { valueAnimator = ValueAnimator.ofInt(MAX_WIDTH - MAX_HEIGHT, 0); } valueAnimator.setDuration(mDuration); valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator valueAnimator) { mWidth = (Integer) valueAnimator.getAnimatedValue(); if (mIsForward) { if (mWidth == MAX_WIDTH - MAX_HEIGHT) { mState = STATE_MOVE_OVER; } } else { if (mWidth == 0) { mState = STATE_MOVE_OVER; } } invalidate(); } }); valueAnimator.start(); } /** * 开始旋转动画 */ private void startRotateAnim() { Collection<Animator> animatorList = new ArrayList<>(); ValueAnimator animatorTextRotate; if (mIsForward) { animatorTextRotate = ValueAnimator.ofInt(0, 360); } else { animatorTextRotate = ValueAnimator.ofInt(360, 0); } animatorTextRotate.setDuration(mDuration); animatorTextRotate.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator valueAnimator) { mAngle = (Integer) valueAnimator.getAnimatedValue(); if (mIsForward) { if (mAngle == 360) { mState = STATE_ROTATE_OVER; } } else { if (mAngle == 0) { mState = STATE_ROTATE_OVER; } } } }); animatorList.add(animatorTextRotate); ValueAnimator animatorAlpha; if (mIsForward) { animatorAlpha = ValueAnimator.ofInt(0, 255); } else { animatorAlpha = ValueAnimator.ofInt(255, 0); } animatorAlpha.setDuration(mDuration); animatorAlpha.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator valueAnimator) { mAlpha = (Integer) valueAnimator.getAnimatedValue(); if (mIsForward) { if (mAlpha == 255) { mState = STATE_ROTATE_OVER; } } else { if (mAlpha == 0) { mState = STATE_ROTATE_OVER; } } } }); animatorList.add(animatorAlpha); ValueAnimator animatorTextMove; if (mIsForward) { animatorTextMove = ValueAnimator.ofInt(MAX_WIDTH - MAX_HEIGHT / 2, MAX_WIDTH / 2); } else { animatorTextMove = ValueAnimator.ofInt(MAX_WIDTH / 2, MAX_WIDTH - MAX_HEIGHT / 2); } animatorTextMove.setDuration(mDuration); animatorTextMove.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator valueAnimator) { mTextPosition = (Integer) valueAnimator.getAnimatedValue(); if (mIsForward) { if (mTextPosition == MAX_WIDTH / 2) { mState = STATE_ROTATE_OVER; } } else { if (mTextPosition == MAX_WIDTH - MAX_HEIGHT / 2) { mState = STATE_ROTATE_OVER; } } } }); animatorList.add(animatorTextMove); ValueAnimator animatorBtnMove; if (mIsForward) { animatorBtnMove = ValueAnimator.ofInt(MAX_WIDTH - MAX_HEIGHT / 2, MAX_HEIGHT / 2); } else { animatorBtnMove = ValueAnimator.ofInt(MAX_HEIGHT / 2, MAX_WIDTH - MAX_HEIGHT / 2); } animatorBtnMove.setDuration(mDuration); animatorBtnMove.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator valueAnimator) { mMinusBtnPosition = (Integer) valueAnimator.getAnimatedValue(); if (mIsForward) { if (mMinusBtnPosition == MAX_HEIGHT / 2) { mState = STATE_ROTATE_OVER; } } else { if (mMinusBtnPosition == MAX_WIDTH - MAX_HEIGHT / 2) { mState = STATE_ROTATE_OVER; } } invalidate(); } }); animatorList.add(animatorBtnMove); AnimatorSet animatorSet = new AnimatorSet(); animatorSet.setDuration(mDuration); animatorSet.playTogether(animatorList); animatorSet.start(); } /** * 设置购买数量 * * @param num 购买数量 */ public void setTextNum(int num) { mNum = num; mState = STATE_ROTATE_OVER; invalidate(); } public void setOnShoppingClickListener(ShoppingClickListener shoppingClickListener) { this.mShoppingClickListener = shoppingClickListener; } public interface ShoppingClickListener { void onAddClick(int num); void onMinusClick(int num); } /** * 判断点是否在圆内 * * @param pointF 待确定点 * @param circle 圆心 * @param radius 半径 * @return true在圆内 */ private boolean isPointInCircle(PointF pointF, PointF circle, float radius) { return Math.pow((pointF.x - circle.x), 2) + Math.pow((pointF.y - circle.y), 2) <= Math.pow(radius, 2); } private int sp2px(float spValue) { final float fontScale = getContext().getResources().getDisplayMetrics().scaledDensity; return (int) (spValue * fontScale + 0.5f); } //获取Text高度 private int getTextHeight(String str, Paint paint) { Rect rect = new Rect(); paint.getTextBounds(str, 0, str.length(), rect); return (int) (rect.height() / 33f * 29); } //获取Text宽度 private int getTextWidth(Paint paint, String str) { int iRet = 0; if (str != null && str.length() > 0) { int len = str.length(); float[] widths = new float[len]; paint.getTextWidths(str, widths); for (int j = 0; j < len; j++) { iRet += (int) Math.ceil(widths[j]); } } return iRet; }}里面用到了自定义的属性所以需要创建attrs.xml
然后在里面定义
<declare-styleable name="ShoppingView"> <attr name="sv_bg_color" format="color"/> <attr name="sv_text" format="string"/> <attr name="sv_text_size" format="dimension"/> <attr name="sv_duration" format="integer"/></declare-styleable>有需要的同学可以去试试看，很好的效果
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