Android图片按手势进行移动

Android图片按手势进行移动

正在做一个游戏，其中要用到用手滑动一个路线，手抬起后，人物图片按此路线移动过去。请大家提供点思路、、、 首先你得重写onTouchEvent是必须的

然后使用一个

定义private ArrayList<PointF> pinfs = new ArrayList<PointF>();来存所以的点

在onTouchEvent中

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源码

        class CustomView1 extends View{
        
        private Paint paint;
        private ArrayList<PointF> graphics = new ArrayList<PointF>();
        private Paint  lPaint;
        private Path   mPath;
        private  int of = 0;
        private Boolean over =false;
        private float mX, mY;
        private static final float TOUCH_TOLERANCE = 4;

        public CustomView1(Context context) {
            super(context);
            paint = new Paint(Paint.ANTI_ALIAS_FLAG);
            paint.setColor(Color.RED);
            paint.setStrokeJoin(Paint.Join.ROUND);
            paint.setStrokeCap(Paint.Cap.ROUND);
            paint.setStrokeWidth(65);
           
            lPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
            lPaint.setColor(Color.BLACK);
            lPaint.setStyle(Paint.Style.STROKE);//空心
            lPaint.setStrokeJoin(Paint.Join.ROUND);
            lPaint.setStrokeCap(Paint.Cap.ROUND);
            lPaint.setStrokeWidth(5);
           
            mPath = new Path();
           
        }
       
        @Override
        public boolean onTouchEvent(MotionEvent event) {
            float x = event.getX();
            float y = event.getY();
            switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                over = false;
                graphics.clear();
                of=0;
                graphics.add(new PointF(x, y));
                 touch_start(x, y);
                 invalidate();
                break;
            case MotionEvent.ACTION_MOVE:
                graphics.add(new PointF(x, y));
                touch_move(x, y);
                invalidate();
                break;
            case MotionEvent.ACTION_UP:
                over = true;
                touch_up();
                invalidate();
                break;
        }

            return true;
        }
       
        private void touch_start(float x, float y) {
            mPath.reset();
            mPath.moveTo(x, y);
            mX = x;
            mY = y;
        }
        private void touch_move(float x, float y) {
            float dx = Math.abs(x - mX);
            float dy = Math.abs(y - mY);
            if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
                mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2);
                mX = x;
                mY = y;
            }
        }
        private void touch_up() {
            mPath.lineTo(mX, mY);
        }

        @Override
        protected void onDraw(Canvas canvas) {
        //    canvas.drawColor(Color.TRANSPARENT,Mode.CLEAR);
            canvas.drawColor(Color.WHITE);//清理
            canvas.drawPath(mPath, lPaint);
            if(over&&graphics.size()>0){
                canvas.drawPoint(graphics.get(of).x, graphics.get(of).y, paint);
                of+=1;
                if(of<graphics.size()){
                    if(of==graphics.size()-1){
                        mPath.reset();//移动完成后移除线条
                    }
                    invalidate();
                }
            }
        }
    }