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switch(event.getPointerCount()){
case 2:
switch(event.getAction()){
case MotionEvent.ACTION_POINTER_2_DOWN:
moveX = event.getX(1) - event.getX(0);
moveY = event.getY(1) - event.getY(0);
beforeDistance = (float)Math.sqrt(moveX*moveX + moveY*moveY);
Log.i(TAG, "pointer down: " +x0+" "+ y0);
break;
case MotionEvent.ACTION_POINTER_UP:
moveX = event.getX(1) - event.getX(0);
moveY = event.getY(1) - event.getY(0);
afterDistance = (float)Math.sqrt(moveX*moveX + moveY*moveY);
int width = (int)(iView.getWidth()*afterDistance/beforeDistance);
int height = (int)(iView.getHeight()*afterDistance/beforeDistance);
iView.layout(x0, y0, x0 + width, y0 + height);
Log.i(TAG, "pointer up: " +x0+" "+ y0);
break;
default:
break;
}
break;
case 1:
switch(event.getAction()){
case MotionEvent.ACTION_DOWN:
x = event.getX();
y = event.getY();
break;
case MotionEvent.ACTION_MOVE:
mx = (int) (event.getX() - x + x0);
my = (int) (event.getY() - y + y0);
iView.layout(mx , my , mx + iView.getWidth(), my + iView.getHeight());
break;
case MotionEvent.ACTION_UP:
x0 = mx;
y0 = my;
Log.i(TAG, x0+", "+y0);
break;
default:
break;
}
break;
default:
break;
}
MotionEvent.ACTION_POINTER_DOWN
就无法识别。只有MotionEvent.ACTION_POINTER_2_DOWN
才可以识别。这是为什么。。。