Android手势缩放图片以及图片黏贴在手指随手势移动
发布时间:2020-12-14 23:29:58 所属栏目:Java 来源:网络整理
导读:今天PHP站长网 52php.cn把收集自互联网的代码分享给大家,仅供参考。 ImageViewOnMultiTouchListener listener=new ImageViewOnMultiTouchListener(); ImageView mImageView=(ImageView)findViewById(R.id.imageView); mI
以下代码由PHP站长网 52php.cn收集自互联网 现在PHP站长网小编把它分享给大家,仅供参考 ImageViewOnMultiTouchListener listener=new ImageViewOnMultiTouchListener(); ImageView mImageView=(ImageView)findViewById(R.id.imageView); mImageView.setOnTouchListener(listener); public class ImageViewOnMultiTouchListener implements View.OnTouchListener { private final int NONE = 0; private final int MOVE = 1; private final int ZOOM = 2; private final int DRAG = 3; private int mode = NONE; private Matrix matrix = new Matrix(); private Matrix savedMatrix = new Matrix(); private PointF start = new PointF(); private PointF mid = new PointF(); private float oldDistance = 0; @Override public boolean onTouch(View v,MotionEvent event) { ImageView view = (ImageView) v; switch (event.getAction() & MotionEvent.ACTION_MASK) { case MotionEvent.ACTION_DOWN: matrix.set(view.getImageMatrix()); savedMatrix.set(matrix); start.set(event.getX(),event.getY()); mode = DRAG; break; case MotionEvent.ACTION_POINTER_DOWN: oldDistance = spacing(event); if (oldDistance > 5f) { savedMatrix.set(matrix); midPoint(mid,event); mode = ZOOM; } break; case MotionEvent.ACTION_UP: case MotionEvent.ACTION_POINTER_UP: mode = NONE; break; case MotionEvent.ACTION_MOVE: if (mode == DRAG) { matrix.set(savedMatrix); matrix.postTranslate(event.getX() - start.x,event.getY() - start.y); } else if (mode == ZOOM) { float newDist = spacing(event); if (newDist > 5f) { matrix.set(savedMatrix); float scale = newDist / oldDistance; matrix.postScale(scale,scale,mid.x,mid.y); } } break; } view.setImageMatrix(matrix); view.setScaleType(ImageView.ScaleType.MATRIX); view.setPadding(3,5,3,5); return true; } private float spacing(MotionEvent event) { float x = event.getX(0) - event.getX(1); float y = event.getY(0) - event.getY(1); return FloatMath.sqrt(x * x + y * y); } private void midPoint(PointF point,MotionEvent event) { float x = event.getX(0) + event.getX(1); float y = event.getY(0) + event.getY(1); point.set(x / 2,y / 2); } } 以上内容由PHP站长网【52php.cn】收集整理供大家参考研究 如果以上内容对您有帮助,欢迎收藏、点赞、推荐、分享。 (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |