本文实例为大家分享了Android实现电影院选座效果展示的具体代码，供大家参考，具体内容如下

这是一个简单的电影院选座效果，实现该效果大致分为三步：

1.自定义view进行绘制；
2.手势缩放效果的实现；
3.手势触摸被选和未被选效果的实现；

先来看第一步，效果的绘制；

public class MoveSeatView extends View { private final boolean DBG = false; private Paint paint = new Paint(); private Matrix matrix = new Matrix(); private Matrix tempMatrix = new Matrix(); //座位水平间距 private int spacing; //座位垂直间距 private int verSpacing; //行号宽度 private int numberWidth; //行数 private int row; //列数 private int column; //可选座位的图片 private Bitmap seatBitmap; //选中时座位的图片 private Bitmap checkedSeatBitmap; private int lastX; private int lastY; //整个座位图的宽度 private int seatBitmapWidth; private int seatBitmapHeight; private float screenHeight; //屏幕的最小宽度 private int defaultScreenWidth; //标识是否正在缩放 private boolean isScaling; private float scaleX, scaleY; //是否是第一次缩放 private boolean firstScale = true; private boolean isOnClick; private int downX, downY; private boolean pointer; //用于存储已经选在好的座位 public ArrayList<Point> list; /** * 默认的座位图片的宽度，如果使用的自己的座位的图片比这个尺寸大或者小，会缩放到这个大小 */ private float defaultImgW = 40; private float defaultImgH = 34; /** * 座位图片的宽度 */ private int seatWidth = 40; /** * 座位图片的高度 */ private int seatHeight = 34; private float zoom; float xScalel = 1; float yScalel = 1; public MoveSeatView(Context context) { this(context, null); } public MoveSeatView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public MoveSeatView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } private void init() { spacing = (int) dip2px(5); verSpacing = (int) dip2px(10); defaultScreenWidth = (int) dip2px(80); seatBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.seat_default); xScalel = defaultImgW / seatBitmap.getWidth(); yScalel = defaultImgH / seatBitmap.getHeight(); checkedSeatBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.seat_green); seatBitmapWidth = (int) (column * seatBitmap.getWidth() * xScalel + (column - 1) * spacing); seatBitmapHeight = (int) (row * seatBitmap.getHeight() * yScalel + (row - 1) * verSpacing); paint.setColor(Color.RED); numberWidth = (int) dip2px(20); screenHeight = dip2px(20); list = new ArrayList<>(); matrix.postTranslate(numberWidth + spacing, screenHeight + 1 + verSpacing); }}

上面这些都是一些初始化动作，接下来在onDraw方法中进行绘制；

@Override protected void onDraw(Canvas canvas) { if (row <= 0 || column <= 0) { return; } drawSeat(canvas); super.onDraw(canvas); }

具体的绘制逻辑实在drawSeat(),方法中实现的；

/** * 绘制 * * @param canvas */ private void drawSeat(Canvas canvas) { zoom = getMatrixScaleX(); float translateX = getTranslateX(); float translateY = getTranslateY(); float scaleX = zoom; float scaleY = zoom; for (int i = 0; i < row; i++) { float top = i * seatBitmap.getHeight() * yScalel * scaleY + i * verSpacing * scaleY + translateY; float bottom = top + seatBitmap.getHeight() * yScalel * scaleY; for (int j = 0; j < column; j++) { float left = j * seatBitmap.getWidth() * xScalel * scaleX + j * spacing * xScalel * scaleX + translateX; float right = left + seatBitmap.getWidth() * xScalel * scaleX; tempMatrix.setTranslate(left, top); tempMatrix.postScale(xScalel, yScalel, left, top); tempMatrix.postScale(scaleX, scaleY, left, top); if (isHave(i, j)) { //绘制被选 canvas.drawBitmap(checkedSeatBitmap, tempMatrix, paint); //绘制文字 drawText(canvas, i, j, top, left); } else { //绘制普通 canvas.drawBitmap(seatBitmap, tempMatrix, paint); } } } }

主要是计算绘制的位置，矩阵的缩放，根据是否被选进行绘制不同的效果；

/** * 绘制文字 * * @param canvas * @param row * @param column * @param top * @param left */ private void drawText(Canvas canvas, int row, int column, float top, float left) { String txt = (row + 1) + "排"; String txt1 = (column + 1) + "座"; //实例化文字画笔 TextPaint txtPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG); txtPaint.setColor(Color.WHITE); //设置字体样式 txtPaint.setTypeface(Typeface.DEFAULT_BOLD); float seatHeight = this.seatHeight * getMatrixScaleX(); float seatWidth = this.seatWidth * getMatrixScaleX(); txtPaint.setTextSize(seatHeight / 3); //获取中间线 float center = seatHeight / 2; float txtWidth = txtPaint.measureText(txt); float startX = left + seatWidth / 2 - txtWidth / 2; //只绘制一行文字 if (txt1 == null) { canvas.drawText(txt, startX, getBaseLine(txtPaint, top, top + seatHeight), txtPaint); } else { canvas.drawText(txt, startX, getBaseLine(txtPaint, top, top + center), txtPaint); canvas.drawText(txt1, startX, getBaseLine(txtPaint, top + center, top + center + seatHeight / 2), txtPaint); } if (DBG) { Log.d("drawTest", "top" + top); } }

这里是使用TextPaint画笔进行文字的绘制，在绘制文字的时候要注意基准线；

/** * 获取基准线 * @param p * @param top * @param bottom * @return */ private float getBaseLine(Paint p, float top, float bottom) { Paint.FontMetrics fontMetrics = p.getFontMetrics(); int baseLine = (int) ((bottom + top - fontMetrics.bottom - fontMetrics.top) / 2); return baseLine; }

这样大致的绘制做完成了，剩下的第二步和第三步都涉及到手势触摸，在onTouchEvent方法中去实现具体的逻辑；

@Override public boolean onTouchEvent(MotionEvent event) { int x = (int) event.getX(); int y = (int) event.getY(); //手势缩放 scaleGuestureDetector.onTouchEvent(event); //手势 gestureDetector.onTouchEvent(event); //获取当前操作的手指数量 int pointerCount = event.getPointerCount(); if (pointerCount > 1) { //多手指操作 pointer = true; } switch (event.getAction()) { case MotionEvent.ACTION_DOWN: pointer = false; downX = x; downY = y; invalidate(); break; case MotionEvent.ACTION_UP: autoScale(); break; case MotionEvent.ACTION_MOVE: if (!isScaling && !isOnClick) { int downDX = Math.abs(x - downX); int downDY = Math.abs(y - downY); if ((downDX > 10 || downDY > 10) && !pointer) { int dx = x - lastX; int dy = y - lastY; matrix.postTranslate(dx, dy); invalidate(); } } lastX = x; lastY = y; isOnClick = false; break; } return true; }

刚触摸去选择的时候会有个手势缩放的效果，手势缩放系统提供了ScaleGestureDetector类可以很容易的实现，具体的逻辑系统都已经处理好了，在对应的回调方法里面去实现就可以了；

/** * 手势缩放 */ ScaleGestureDetector scaleGuestureDetector = new ScaleGestureDetector(getContext(), new ScaleGestureDetector.OnScaleGestureListener() { @Override public boolean onScale(ScaleGestureDetector detector) { //正在缩放的时候回调 isScaling = true; float scaleFactor = detector.getScaleFactor(); if (getMatrixScaleY() * scaleFactor > 3) { scaleFactor = 3 / getMatrixScaleY(); } if (firstScale) { scaleX = detector.getCurrentSpanX(); scaleY = detector.getCurrentSpanY(); firstScale = false; } if (getMatrixScaleY() * scaleFactor < 0.5) { scaleFactor = 0.5f * getMatrixScaleY(); } matrix.postScale(scaleFactor, scaleFactor, scaleX, scaleY); invalidate(); return true; } @Override public boolean onScaleBegin(ScaleGestureDetector detector) { //开始缩放的时候回调 return false; } @Override public void onScaleEnd(ScaleGestureDetector detector) { //缩放完成回调 isScaling = false; firstScale = true; } });

其他的手势操作系统还提供了GestureDetector类，可以使用GestureDetector来实现具体的效果；

GestureDetector gestureDetector = new GestureDetector(getContext(), new GestureDetector.SimpleOnGestureListener() { @Override public boolean onSingleTapConfirmed(MotionEvent e) { int x = (int) e.getX(); int y = (int) e.getY(); for (int i = 0; i < row; i++) { for (int j = 0; j < column; j++) { int tempX = (int) ((j * seatWidth + j * spacing) * getMatrixScaleX() + getTranslateX()); int maxTempX = (int) (tempX + seatWidth * getMatrixScaleX()); int tempY = (int) ((seatHeight * i + i * verSpacing) * getMatrixScaleY() + getTranslateY()); int maxTempY = (int) (tempY + seatHeight * getMatrixScaleY()); if (x >= tempX && x <= maxTempX && y >= tempY && y <= maxTempY) { if (isHave(i, j)) { remove(i, j); } else { list.add(new Point(i, j)); } } } } float currentScaleY = getMatrixScaleY(); if (currentScaleY < 1.7) { scaleX = x; scaleY = y; zoomAnimate(currentScaleY, 1.9f); } invalidate(); return true; } });

完成上面三步，效果也就大致实现了，提供外部设置的方法供调用就可以了；

/** * 对外界提供的设置方法 * @param row * @param column */ public void setData(int row, int column) { this.row = row; this.column = column; init(); invalidate(); }

源码地址：Android实现电影院选座效果

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。