public class LYJViewGroup extends ViewGroup implements LYJGestureDrawline.OnAnimationCallback{
  /**
   * 每個(gè)點(diǎn)區(qū)域的寬度
   */
  private int childWidth;
  /***
   * 上下文
   */
  private Context context;
  /***
   * 保存圖片點(diǎn)的位置
   */
  private List<LYJGesturePoint> list;
  /***
   * 創(chuàng)建view使其在ViewGroup之上。
   */
  private LYJGestureView gestureDrawline;
  private int baseNum = 5;
  public LYJViewGroup(Context context) {
    super(context);
    this.context = context;
    this.list = new ArrayList<>();
    DisplayMetrics metric = new DisplayMetrics();
    ((Activity) context).getWindowManager().getDefaultDisplay().getMetrics(metric);
    childWidth = metric.widthPixels / 3;   // 屏幕寬度（像素）
    addChild();
    // 初始化一個(gè)可以畫線的view
    gestureDrawline = new LYJGestureView(context, list);
    gestureDrawline.setAnimationCallback(this);
  }
  public void setParentView(ViewGroup parent){
    // 得到屏幕的寬度
    DisplayMetrics metric = new DisplayMetrics();
    ((Activity) context).getWindowManager().getDefaultDisplay().getMetrics(metric);
    int width = metric.widthPixels;
    LayoutParams layoutParams = new LayoutParams(width, width);
    this.setLayoutParams(layoutParams);
    gestureDrawline.setLayoutParams(layoutParams);
    parent.addView(this);
    parent.addView(gestureDrawline);
  }
  @Override
  protected void onLayout(boolean changed, int l, int t, int r, int b) {
    for (int i = 0; i < getChildCount(); i++) {
      //第幾行
      int rowspan = i / 3;
      //第幾列
      int column = i % 3;
      android.view.View v = getChildAt(i);
      v.layout(column * childWidth + childWidth / baseNum, rowspan * childWidth + childWidth / baseNum,
          column * childWidth + childWidth - childWidth / baseNum, rowspan * childWidth + childWidth - childWidth / baseNum);
    }
  }
  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    // 遍歷設(shè)置每個(gè)子view的大小
    for (int i = 0; i < getChildCount(); i++) {
      View v = getChildAt(i);
      v.measure(widthMeasureSpec, heightMeasureSpec);
    }
  }

  private void addChild() {
    for (int i = 0; i < 9; i++) {
      ImageView image = new ImageView(context);
      image.setBackgroundResource(R.drawable.marker);
      this.addView(image);
      invalidate();
      // 第幾行
      int rowspan = i / 3;
      // 第幾列
      int column = i % 3;
      // 定義點(diǎn)的左上角與右下角的坐標(biāo)
      int leftX = column * childWidth + childWidth / baseNum;
      int topY = rowspan * childWidth + childWidth / baseNum;
      int rightX = column * childWidth + childWidth - childWidth / baseNum;
      int bottomY = rowspan * childWidth + childWidth - childWidth / baseNum;
      LYJGesturePoint p = new LYJGesturePoint(leftX, topY, rightX,bottomY,i);
      this.list.add(p);
    }
  }
  
  @Override
  public void startAnimationImage(int i) {
    Animation animation= AnimationUtils.loadAnimation(getContext(), R.anim.gridlayout_child_scale_anim);
    getChildAt(i).startAnimation(animation);
  }
}

public class LYJGesturePoint {
  private Point pointLeftTop;//左上角坐標(biāo)
  private Point pointRightBottom;//右下角坐標(biāo)
  private int centerX;//圖片中心點(diǎn)X坐標(biāo)
  private int centerY;//圖片中心點(diǎn)Y坐標(biāo)
  private int pointState;//是否點(diǎn)擊了該圖片

  private int num;

  public int getNum() {
    return num;
  }

  public int getPointState() {
    return pointState;
  }

  public void setPointState(int pointState) {
    this.pointState = pointState;
  }

  public Point getPointLeftTop() {
    return pointLeftTop;
  }

  public Point getPointRightBottom() {
    return pointRightBottom;
  }

  public LYJGesturePoint(int left,int top,int right,int bottom,int i){
    this.pointLeftTop=new Point(left,top);
    this.pointRightBottom=new Point(right,bottom);
    this.num=i;
  }

  public int getCenterX() {
    this.centerX=(this.pointLeftTop.x+this.pointRightBottom.x)/2;
    return centerX;
  }

  public int getCenterY() {
    this.centerY=(this.pointLeftTop.y+this.pointRightBottom.y)/2;
    return centerY;
  }
}

public class LYJCirclePoint {
  private int roundX;//圓中心點(diǎn)X坐標(biāo)
  private int roundY;//圓中心點(diǎn)Y坐標(biāo)
  private int radiu;//圓半徑

  public int getRadiu() {
    return radiu;
  }

  public int getRoundX() {
    return roundX;
  }

  public int getRoundY() {
    return roundY;
  }

  public LYJCirclePoint(int roundX,int roundY,int radiu){
    this.roundX=roundX;
    this.roundY=roundY;
    this.radiu=radiu;
  }
}

public class LYJGestureView extends android.view.View {
  /***
   * 聲明直線畫筆
   */
  private Paint paint;
  /***
   * 聲明圓圈畫筆
   */
  private Paint circlePaint;
  /***
   * 畫布
   */
  private Canvas canvas;
  /***
   * 位圖
   */
  private Bitmap bitmap;
  /***
   * 裝有各個(gè)view坐標(biāo)的集合，用于判斷點(diǎn)是否在其中
   */
  private List<LYJGesturePoint> list;
  /***
   * 記錄畫過的線
   */
  private List<Pair<LYJGesturePoint, LYJGesturePoint>> lineList;
  /***
   * 記錄畫過的圓
   */
  private List<LYJCirclePoint> circlePoints;
  /**
   * 手指當(dāng)前在哪個(gè)Point內(nèi)
   */
  private LYJGesturePoint currentPoint;
  /***
   * 手指按下動畫
   */
  private OnAnimationCallback animationCallback;
  public interface OnAnimationCallback{
    public void startAnimationImage(int i);
  }

  public void setAnimationCallback(OnAnimationCallback animationCallback) {
    this.animationCallback = animationCallback;
  }

  public LYJGestureView(Context context, List<LYJGesturePoint> list){
    super(context);
    Log.i(getClass().getName(), "GestureDrawline");
    paint = new Paint(Paint.DITHER_FLAG);// 創(chuàng)建一個(gè)畫筆
    circlePaint=new Paint(Paint.DITHER_FLAG);
    DisplayMetrics metric = new DisplayMetrics();
    ((Activity)context).getWindowManager().getDefaultDisplay().getMetrics(metric);
    Log.i(getClass().getName(), "widthPixels" + metric.widthPixels);
    Log.i(getClass().getName(), "heightPixels" + metric.heightPixels);
    bitmap = Bitmap.createBitmap(metric.widthPixels, metric.heightPixels, Bitmap.Config.ARGB_8888); // 設(shè)置位圖的寬高
    canvas = new Canvas();
    canvas.setBitmap(bitmap);
    paint.setStyle(Paint.Style.STROKE);// 設(shè)置非填充
    paint.setStrokeWidth(20);// 筆寬20像素
    paint.setColor(Color.rgb(245, 142, 33));// 設(shè)置默認(rèn)連線顏色
    paint.setAntiAlias(true);// 不顯示鋸齒
    circlePaint.setStyle(Paint.Style.FILL);
    circlePaint.setStrokeWidth(1);
    circlePaint.setAntiAlias(true);
    circlePaint.setColor(Color.rgb(245, 142, 33));

    this.list = list;
    this.lineList = new ArrayList<>();
    this.circlePoints=new ArrayList<>();
  }

  @Override
  public boolean onTouchEvent(MotionEvent event) {
    switch (event.getAction()){
      case MotionEvent.ACTION_DOWN:
        // 判斷當(dāng)前點(diǎn)擊的位置是處于哪個(gè)點(diǎn)之內(nèi)
        currentPoint = getPointAt((int) event.getX(), (int) event.getY());
        if (currentPoint != null) {
          currentPoint.setPointState(Constants.POINT_STATE_SELECTED);
          this.animationCallback.startAnimationImage(currentPoint.getNum());
          canvas.drawCircle(currentPoint.getCenterX(), currentPoint.getCenterY(), 20, circlePaint);
          circlePoints.add(new LYJCirclePoint(currentPoint.getCenterX(),currentPoint.getCenterY(),20));
        }
        invalidate();
        break;
      case MotionEvent.ACTION_MOVE:
        clearScreenAndDrawList();
        // 得到當(dāng)前移動位置是處于哪個(gè)點(diǎn)內(nèi)
        LYJGesturePoint pointAt = getPointAt((int) event.getX(), (int) event.getY());
        if (currentPoint == null && pointAt == null) {//你把手指按在屏幕滑動，如果終點(diǎn)與起點(diǎn)都不圖片那么返回
          return true;
        } else {// 代表用戶的手指移動到了點(diǎn)上
          if (currentPoint == null) {// 先判斷當(dāng)前的point是不是為null
            // 如果為空，那么把手指移動到的點(diǎn)賦值給currentPoint
            currentPoint = pointAt;
            // 把currentPoint這個(gè)點(diǎn)設(shè)置選中狀態(tài);
            currentPoint.setPointState(Constants.POINT_STATE_SELECTED);
          }
        }
        //如果移動到的點(diǎn)不為圖片區(qū)域或者移動到自己的地方，或者該圖片已經(jīng)為選中狀態(tài)，直接畫直線就可以了
        if(pointAt == null || currentPoint.equals(pointAt) || Constants.POINT_STATE_SELECTED == pointAt.getPointState()){
          canvas.drawCircle(currentPoint.getCenterX(), currentPoint.getCenterY(), 20, circlePaint);
          circlePoints.add(new LYJCirclePoint(currentPoint.getCenterX(), currentPoint.getCenterY(), 20));
          canvas.drawLine(currentPoint.getCenterX(), currentPoint.getCenterY(), event.getX(), event.getY(), paint);
        }else{//其他情況畫兩點(diǎn)相連直線，并且保存繪制圓與直線，并調(diào)用按下圖片的縮放動畫
          canvas.drawCircle(pointAt.getCenterX(),pointAt.getCenterY(),20,circlePaint);
          circlePoints.add(new LYJCirclePoint(pointAt.getCenterX(), pointAt.getCenterY(), 20));
          this.animationCallback.startAnimationImage(pointAt.getNum());
          pointAt.setPointState(Constants.POINT_STATE_SELECTED);
          canvas.drawLine(currentPoint.getCenterX(), currentPoint.getCenterY(), pointAt.getCenterX(), pointAt.getCenterY(), paint);
          Pair<LYJGesturePoint, LYJGesturePoint> pair = new Pair<>(currentPoint, pointAt);
          lineList.add(pair);
          currentPoint=pointAt;//設(shè)置選中點(diǎn)為當(dāng)前點(diǎn)。
        }
        invalidate();//重繪
        break;
      case MotionEvent.ACTION_UP:
        clearScreenAndDrawList();//防止多出一條沒有終點(diǎn)的直線
        new Handler().postDelayed(new clearLineRunnable(), 1000);//1秒后清空繪制界面
        invalidate();//重繪
        break;
      default:
        break;
    }
    return true;
  }

  class clearLineRunnable implements Runnable {
    public void run() {
      // 清空保存點(diǎn)與圓的集合
      lineList.clear();
      circlePoints.clear();
      // 重新繪制界面
      clearScreenAndDrawList();
      for (LYJGesturePoint p : list) {
        //設(shè)置其為初始化不選中狀態(tài)
        p.setPointState(Constants.POINT_STATE_NORMAL);
      }
      invalidate();
    }
  }

  /**
   * 通過點(diǎn)的位置去集合里面查找這個(gè)點(diǎn)是包含在哪個(gè)Point里面的
   *
   * @param x
   * @param y
   * @return 如果沒有找到，則返回null，代表用戶當(dāng)前移動的地方屬于點(diǎn)與點(diǎn)之間
   */
  private LYJGesturePoint getPointAt(int x, int y) {

    for (LYJGesturePoint point : list) {
      // 先判斷點(diǎn)是否在圖片的X坐標(biāo)內(nèi)
      int leftX = point.getPointLeftTop().x;
      int rightX = point.getPointRightBottom().x;
      if (!(x >= leftX && x < rightX)) {
        // 如果為假，則跳到下一個(gè)對比
        continue;
      }
      //在判斷點(diǎn)是否在圖片的Y坐標(biāo)內(nèi)
      int topY = point.getPointLeftTop().y;
      int bottomY = point.getPointRightBottom().y;
      if (!(y >= topY && y < bottomY)) {
        // 如果為假，則跳到下一個(gè)對比
        continue;
      }

      // 如果執(zhí)行到這，那么說明當(dāng)前點(diǎn)擊的點(diǎn)的位置在遍歷到點(diǎn)的位置這個(gè)地方
      return point;
    }

    return null;
  }

  /**
   * 清掉屏幕上所有的線，然后畫出集合里面的線
   */
  private void clearScreenAndDrawList() {
    canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
    for (Pair<LYJGesturePoint, LYJGesturePoint> pair : lineList) {
      canvas.drawLine(pair.first.getCenterX(), pair.first.getCenterY(),
          pair.second.getCenterX(), pair.second.getCenterY(), paint);// 畫線
    }
    for(LYJCirclePoint lyjCirclePoint : circlePoints){
      canvas.drawCircle(lyjCirclePoint.getRoundX(),lyjCirclePoint.getRoundY(), lyjCirclePoint.getRadiu(),circlePaint);
    }
  }
  //繪制用bitmap創(chuàng)建出來的畫布
  @Override
  protected void onDraw(Canvas canvas) {
    canvas.drawBitmap(bitmap, 0, 0, null);
  }
}