Android实现电影院选座效果

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); }}

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

/**  * 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);    }   }  } }

/**  * 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);   } }

/**  * 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; }

@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; }

/**  * 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;   } });

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;  } });

/**  * 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(); }