资 源 简 介
Android 手势监听和图片放大缩小功能实例，安卓手机系统控制实例。关键代码分享如下：
ImageView myImageView = (ImageView) v;
switch (event.getAction() & MotionEvent.ACTION_MASK) {
// 设置拖拉模式
case MotionEvent.ACTION_DOWN:
matrix.set(myImageView.getImageMatrix());
savedMatrix.set(matrix);
start.set(event.getX(), event.getY());
mode = DRAG;
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
break;
case MotionEvent.ACTION_POINTER_DOWN:
oldDist = spacing(event);
if (oldDist > 10f) {
savedMatrix.set(matrix);
midPoint(mid, event);
mode = ZOOM;
}
// 若为DRAG模式，则点击移动图片
case MotionEvent.ACTION_MOVE:
if (mode == DRAG) {
matrix.set(savedMatrix);
matrix.postTranslate(event.getX() - start.x, event.getY()
- start.y);
} // 若为ZOOM模式，则点击触摸缩放
else if (mode == ZOOM) {
float newDist = spacing(event);
if (newDist > 10f) {
matrix.set(savedMatrix);
float scale = newDist / oldDist;
// 设置缩放比例和图片的中点位置
matrix.post
