Android 多点触控错误处理（java.lang.IllegalArgumentException: pointerIndex out of range）

　　最近做View的多点触控时，每次第一次触控事件完美运行，第二次就直接崩了，错误信息如下：

　　　

01-03 00:05:44.220 4377-4410/system_process E/AndroidRuntime: *** FATAL EXCEPTION IN SYSTEM PROCESS: android.ui

java.lang.IllegalArgumentException: pointerIndex out of range

at android.view.MotionEvent.nativeGetAxisValue(Native Method)

at android.view.MotionEvent.getX(MotionEvent.java:2072)

at com.android.server.policy.EnableAccessibilityController.onTouchEvent(EnableAccessibilityController.java:193)

at com.android.server.policy.GlobalActions.onTouch(GlobalActions.java:1077)

at android.view.View.dispatchTouchEvent(View.java:9404)

at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2660)

at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2304)

at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2666)

at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2318)

at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2666)

at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2318)

at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2666)

at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2318)

at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2666)

at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2318)

at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2666)

at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2318)

at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2666)

at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2318)

at com.android.internal.policy.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2447)

at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1766)

at android.app.Dialog.dispatchTouchEvent(Dialog.java:797)

at com.android.internal.policy.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2408)

at android.view.View.dispatchPointerEvent(View.java:9646)

at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4738)

at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4596)

at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4101)

at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4154)

at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4120)

at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4266)

at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4128)

at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4323)

at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4101)

at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4154)

at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4120)

at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4128)

at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4101)

at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:6555)

at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:6529)

at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6472)

at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:6727)

at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)

at android.view.InputEventReceiver.nativeConsumeBatchedInputEvents(Native Method)

at android.view.InputEventReceiver.consumeBatchedInputEvents(InputEventReceiver.java:176)

at android.view.ViewRootImpl.doConsumeBatchedInput(ViewRootImpl.java:6686)

at android.view.ViewRootImpl$ConsumeBatchedInputRunnable.run(ViewRootImpl.java:6753)

at android.view.Choreographer$CallbackRecord.run(Choreographer.java:894)

at android.view.Choreographer.doCallbacks(Choreographer.java:696)

at android.view.Choreographer.doFrame(Choreographer.java:625)

at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:880)

at android.os.Handler.handleCallback(Handler.java:815)

at android.os.Handler.dispatchMessage(Handler.java:104)

at android.os.Looper

解决方案：

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
[java]
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，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
[java] 
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。