java.lang.IllegalArgumentException: pointerIndex out of range

// java.lang.IllegalArgumentException: pointerIndex out of range
// at android.view.MotionEvent.nativeGetAxisValue(Native Method)
// at android.view.MotionEvent.getY(MotionEvent.java:1989)
// at android.widget.ScrollView.onTouchEvent(ScrollView.java:575)
// at android.view.View.dispatchTouchEvent(View.java:5541)
// at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1963)

// at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1724)

网上说明：

The edge slop code could violate invariants of ScaleGestureDetector,
such as the assumption that if an ACTION_POINTER_DOWN is observed
or if getPointerCount() >= 2, then there must be at least two
active pointers to choose from.  But due to the edge slop handling,
it was possible for findNewActiveIndex to return -1 in this
case, resulting in a crash.

解决方案：

在做多点触控放大缩小，操作自己所绘制的图形时发生这个异常，如果是操作图片的放大缩小多点触控不会出现这个错误
这个bug是Android系统原因   所以第一种方式是：
修改frameworks\base\core\jni\android_view_MotionEvent.cpp的android_view_MotionEvent_nativeGetAxisValue方法
  
  
  
  

   
   
   
   注释掉
  
  
  
  
  
  
  
  

   
   
   
   
if (!validatePointerIndex(env, pointerIndex, pointerCount)) {return 0;｝
  
  
  
  
  
  
  
  

   
   
   
   

     改完后需重新编译整个系统，然后替换lib库，重新编译整个系统一般需要半个多小时，这个方法就比较麻烦了 
   
   
   
   
   

       
   
   
   
   
   

     第二种方法是：捕获IllegalArgumentException（非法参数异常）异常 即如 
   
   
   
   
   
 
    
private float spacing(MotionEvent event) {
        try {
        x = event.getX(0) - event.getX(1);
        y = event.getY(0) - event.getY(1);
    } catch (IllegalArgumentException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
 
   
   
   
   
   

         第二种方法简单有效 
   
  
  
  
  

转自：http://blog.csdn.net/eoeandroida/article/details/7954398