[android-developers] Re: touch screen with two finger gesture to magnify or shrink

The ontouchevent syntax has changed since multitouch is supported.
Check the new documentation.

On Apr 1, 11:56 pm, a a <harvey.a...@gmail.com> wrote:
> I think most of people have played the "angry birds". It can magnify
> or shrink background when you move your two finger.
>
> I want to get the two start point like a(x1, y1) and b(x2, y2), and
> the two last point c(x3, y3) and d(x4, y4)
>
> if ( (x1 - x2) < (x3 - x4) || (y1 - y2) < (y3 - y4)) {
>   // shrink
>
> } else {
>   // magnify
> }
>
> the I tested following code:
>         public void onTouchEvent(MotionEvent event) {
>             if (event.getAction() == MotionEvent.ACTION_MOVE) {
>                 mTouchX = event.getX();
>                 mTouchY = event.getY();
>                 Log.d("harvey", "move(x, y) = " + " ( " + mTouchX + "
> ,  " + mTouchY + " )");
>             } else if (event.getAction() == MotionEvent.ACTION_DOWN) {
>                 Log.d("harvey", "down(x1, y1) = " + "(" + event.getX()
> + ", " + event.getY() + ")");
>             } else if(event.getAction() == MotionEvent.ACTION_UP) {
>                 Log.d("harvey", "up(x1, y1) = " + "(" + event.getX() +
> ", " + event.getY() + ")");
>             }
>             super.onTouchEvent(event);
>         }
>
> Form the log, it seams that can only get one finger's position, but
> not the two finger at the same time.
>
> Would you provider any idea how to implement this?

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