有趣的android触摸问题

Question

我遇到的问题是我正在使用onTouch事件的触摸监听器,当我只触摸一次时,似乎不止一次调用触摸.以下是我的代码

final TextView tv = (TextView)findViewById(R.id.TextView01);

        tv.setOnTouchListener(new View.OnTouchListener() {
            int count1 =0;
            int count2=0;
            public boolean onTouch(View arg0, MotionEvent event) {
                Log.d("Code777","Touch is being called finger");
                int i = event.getPointerCount();



                if(i==1 )
                {
                    if(count1==0)
                    {
                        Log.d("Code777","Touched with 1 finger");
                        count1++;
                        count2=0;
                    }

                }

                 if (i==2 )
                {
                     if(count2==0)
                     {
                        Log.d("Code777","Touched with 2 fingers");
                        edit.append(tv.getText());  
                        count2++;
                        count1=0;
                     }
                }
                return true;
            }
        });

难道我做错了什么 ？？单次触摸和双触摸打印日志的次数超过3-4次

问题更新的问题是这两个事件现在都被解雇了

  if(event.getAction() == MotionEvent.ACTION_POINTER_2_DOWN)
                {
                    Log.d("Code777","2 finger touch");
                    return true;
                }else if(event.getAction() == MotionEvent.ACTION_DOWN)
                {
                        Log.d("Code777","Touched with 1 finger");


                    return true;
                }

Answer 1

您的代码将在每次触摸事件期间执行.第一次激活时,可能会对某个ACITON_DOWN事件(当用户第一次触摸屏幕时).第二次,它可能是一个ACTION_UP事件(当用户从​​屏幕上抬起手指时).同样,如果您要在屏幕上滑动手指,则相同的代码将针对某个ACTION_MOVE事件执行多次.你必须检查它的触摸类型.做这样的事情:

switch(event.getAction()){
   case MotionEvent.ACTION_DOWN:
     // Do something that should only happen when the user first touches the screen
     break;
   case MotionEvent.ACTION_MOVE:
     // Do something that should only happen when the user is touching the screen
     break;
   case MotionEvent.ACTION_UP:
     // Do something that should only happen when the user stops touching the screen
     break;
}

编辑:

Android中的多点触控充其量只是奇怪的.并非所有设备都可以处理它.并非所有设备都能处理超过x次触摸等.如果您想处理单个手指的DOWN情况,则可以使用这些ACTION_POINTER_X项目.如果你有这样一系列的事件是这样的:

1.  User touches screen
2.  User touches screen with second finger
3.  User lifts finger 1
4.  User touches screen with finger 1
5.  User lifts finger 2
6.  User touches screen with finger 2
7.  User lifts both finger 1 and finger 2
8.  User touches screen with only finger 2
9.  User touches screen with finger 1

将被解雇的事件将是这样的:

1.  ACTION_DOWN
2.  ACTION_POINTER_2_DOWN
3.  ACTION_POINTER_1_UP
4.  ACTION_POINTER_1_DOWN
5.  ACTION_POINTER_2_UP
6.  ACTION_POINTER_2_DOWN
7.  ACTION_UP (also, one of the pointers actions will fire depending on which finger was lifted first)
8.  ACTION_DOWN
9.  ACTION_POINTER_2_DOWN

等等.