代码如下：

public class LYJGestureView extends android.view.View { /*** * 声明直线画笔 */ private Paint paint; /*** * 声明圆圈画笔 */ private Paint circlePaint; /*** * 画布 */ private Canvas canvas; /*** * 位图 */ private Bitmap bitmap; /*** * 装有各个view坐标的集合，用于判断点是否在其中 */ private List<LYJGesturePoint> list; /*** * 记录画过的线 */ private List<Pair<LYJGesturePoint, LYJGesturePoint>> lineList; /*** * 记录画过的圆 */ private List<LYJCirclePoint> circlePoints; /** * 手指当前在哪个Point内 */ private LYJGesturePoint currentPoint; /*** * 手指按下动画 */ 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);// 创建一个画笔 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); // 设置位图的宽高 canvas = new Canvas(); canvas.setBitmap(bitmap); paint.setStyle(Paint.Style.STROKE);// 设置非填充 paint.setStrokeWidth(20);// 笔宽20像素 paint.setColor(Color.rgb(245, 142, 33));// 设置默认连线颜色 paint.setAntiAlias(true);// 不显示锯齿 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: // 判断当前点击的位置是处于哪个点之内 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(); // 得到当前移动位置是处于哪个点内 LYJGesturePoint pointAt = getPointAt((int) event.getX(), (int) event.getY()); if (currentPoint == null && pointAt == null) {//你把手指按在屏幕滑动，如果终点与起点都不图片那么返回 return true; } else {// 代表用户的手指移动到了点上 if (currentPoint == null) {// 先判断当前的point是不是为null // 如果为空，那么把手指移动到的点赋值给currentPoint currentPoint = pointAt; // 把currentPoint这个点设置选中状态; currentPoint.setPointState(Constants.POINT_STATE_SELECTED); } } //如果移动到的点不为图片区域或者移动到自己的地方，或者该图片已经为选中状态，直接画直线就可以了 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{//其他情况画两点相连直线，并且保存绘制圆与直线，并调用按下图片的缩放动画 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;//设置选中点为当前点。 } invalidate();//重绘 break; case MotionEvent.ACTION_UP: clearScreenAndDrawList();//防止多出一条没有终点的直线 new Handler().postDelayed(new clearLineRunnable(), 1000);//1秒后清空绘制界面 invalidate();//重绘 break; default: break; } return true; } class clearLineRunnable implements Runnable { public void run() { // 清空保存点与圆的集合 lineList.clear(); circlePoints.clear(); // 重新绘制界面 clearScreenAndDrawList(); for (LYJGesturePoint p : list) { //设置其为初始化不选中状态 p.setPointState(Constants.POINT_STATE_NORMAL); } invalidate(); } } /** * 通过点的位置去集合里面查找这个点是包含在哪个Point里面的 * * @param x * @param y * @return 如果没有找到，则返回null，代表用户当前移动的地方属于点与点之间 */ private LYJGesturePoint getPointAt(int x, int y) { for (LYJGesturePoint point : list) { // 先判断点是否在图片的X坐标内 int leftX = point.getPointLeftTop().x; int rightX = point.getPointRightBottom().x; if (!(x >= leftX && x < rightX)) { // 如果为假，则跳到下一个对比 continue; } //在判断点是否在图片的Y坐标内 int topY = point.getPointLeftTop().y; int bottomY = point.getPointRightBottom().y; if (!(y >= topY && y < bottomY)) { // 如果为假，则跳到下一个对比 continue; } // 如果执行到这，那么说明当前点击的点的位置在遍历到点的位置这个地方 return point; } return null; } /** * 清掉屏幕上所有的线，然后画出集合里面的线 */ 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);// 画线 } for(LYJCirclePoint lyjCirclePoint : circlePoints){ canvas.drawCircle(lyjCirclePoint.getRoundX(),lyjCirclePoint.getRoundY(), lyjCirclePoint.getRadiu(),circlePaint); } } //绘制用bitmap创建出来的画布 @Override protected void onDraw(Canvas canvas) { canvas.drawBitmap(bitmap, 0, 0, null); } }

以上就是android模仿百度福袋红包界面开发教程，希望对大家的学习有所帮助，也希望大家多多支持五二脚本。