Android Multi Touch

Question

So, I am trying to check multiple screen touches with an onTouchEvent, but it still only seems to read the first touch. Can anyone help? Here is my code:

public boolean onTouchEvent(MotionEvent e)
{
    int num = e.getPointerCount();
    for(int a = 0;a<num;a++)
    {
    int x = (int) e.getX(e.getPointerId(a));
    int y = (int) e.getY(e.getPointerId(a));
    check(x,y);
    }

    return false;
}

I looked over a lot of these forums, but most of the multi touch related topics were about zooming.

umbalaconmeogia · Accepted Answer · 2011-11-09 08:38:20Z

4

Your code works well on my device (Nexus S, Android 2.3). It reads all touches.

Here is the test code:

  public boolean onTouchEvent(MotionEvent e) {
    int num = e.getPointerCount();
    for (int a = 0; a < num; a++) {
      int x = (int) e.getX(e.getPointerId(a));
      int y = (int) e.getY(e.getPointerId(a));
      Log.d(TAG, "pointer_" + e.getPointerId(a) + ": x = " + x
          + ", y = " + y);
    }
    return false;
  }

Here is the log (touch with 5 fingers):

11-09 17:32:55.542: D/Touch(20594): pointer_0: x = 169, y = 613
11-09 17:32:55.542: D/Touch(20594): pointer_1: x = 407, y = 289
11-09 17:32:55.542: D/Touch(20594): pointer_2: x = 62, y = 441
11-09 17:32:55.542: D/Touch(20594): pointer_3: x = 251, y = 202
11-09 17:32:55.542: D/Touch(20594): pointer_4: x = 132, y = 256

What is your Android device and OS version?

answered Nov 9, 2011 at 8:38

umbalaconmeogia

1355 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

user1036727 Over a year ago

I have an evo 4g on Cyanogen 7.1, so i think android 2.3.

user1036727 Over a year ago

Nevermind, everything is working now. For some reason, it would not detect the new touches if I returned false. When i changed the return to true, everything worked. Thanks

Thomas Vos Over a year ago

My app crashes when i execute the code. Error is here: pastebin.com/3L35DWFZ

Nathaniel Ford · Accepted Answer · 2015-12-07 23:27:27Z

0

This happens because your method will return false when you want to make move. All multi finger actions should return true.

edited Dec 7, 2015 at 23:27

Nathaniel Ford

21.3k20 gold badges98 silver badges112 bronze badges

answered Dec 7, 2015 at 23:07

ignacio pugliese

398 bronze badges

Collectives™ on Stack Overflow

Android Multi Touch

2 Answers 2

3 Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related