Multitouch issue: when pressing two buttons at the same time, it detects as if I touched only one with my fingers, why?

问题

So I have two buttons and would like to press both at the same time. If I press the first it logs a "C" (as a piano note), the other logs a D.

So far:

@Override
     public boolean onTouch(View v, MotionEvent event) {

        int action = event.getActionMasked();

        switch (event.getAction() & MotionEvent.ACTION_MASK){

        case MotionEvent.ACTION_DOWN:
             switch (v.getId()) { 
                case R.id.cnotebutton: 
                    Log.i("C", "C1");
                    return true;
                case R.id.c2notebutton: 
                      Log.i("D", "D1");
                      return true;
                default:
                }

                break;
            case MotionEvent.ACTION_UP:

                break;  
            case MotionEvent.ACTION_POINTER_DOWN:

                break;
            case MotionEvent.ACTION_POINTER_UP:

                switch (v.getId()) { 
                    case R.id.cnotebutton:
                        Log.i("C", "C2");
                        return true;
                    case R.id.c2notebutton: 
                          Log.i("D", "D2");
                          return true;
                    default:
                    }
                break;
            case MotionEvent.ACTION_MOVE:

                break;
            default:

        }
        return true;
    }

I Log C1 and C2 to distinguish the cases, but every time I press the buttons I get only C1,C2 or D1,D2 as if I touched the same buttons with both of my fingers. I should get C1,D2 or D1,C2 depending on which finger pointed first. Any suggestions? Anyway I havent found a piano sample project yet, but that would definetly help me, if this is not going to work or my approach is totally wrong. Is there any?

Thanks in advance!

回答1:

I think public boolean onInterceptTouchEvent (MotionEvent ev)is what you are looking for. Take a look at this.

来源：https://stackoverflow.com/questions/13722595/multitouch-issue-when-pressing-two-buttons-at-the-same-time-it-detects-as-if-i