Android实现电影院选座效果

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

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