IllegalArgumentException: pointerIndex out of range pointerIndex=-1 pointerCount=1

本文链接：https://blog.youkuaiyun.com/gf6873/article/details/80707452

在使用PhotoView和ViewPager结合时遇到错误：IllegalArgumentException: pointerIndex out of range。问题出现在ViewPager的onInterceptTouchEvent方法中。解决方案是自定义View继承ViewPager，并重写onInterceptTouchEvent方法，通过捕获异常来解决问题。

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使用PhotoView和ViewPager组合是出问题，具体错误如下

java.lang.IllegalArgumentException: pointerIndex out of range pointerIndex=-1 pointerCount=1
                                                                      at android.view.MotionEvent.nativeGetAxisValue(Native Method)
                                                                      at android.view.MotionEvent.getX(MotionEvent.java:2122)
                                                                      at android.support.v4.view.ViewPager.onInterceptTouchEvent(ViewPager.java:2064)
                                                                      at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2212)
                                                                      at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2671)
                                                                      at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2358)
                                                                      at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2671)
                                                                      at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2358)
                                                                      at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2671)
                                                                      at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2358)
                                                                      at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2671)
                                                                      at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2358)
                                                                      at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2671)
                                                                      at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2358)
                                                                      at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2671)
                                                                      at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2358)
                                                                      at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:447)
                                                                      at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1871)
                                                                      at android.app.Activity.dispatchTouchEvent(Activity.java:3213)
                                                                      at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:68)
                                                                      at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:409)
                                                                      at android.view.View.dispatchPointerEvent(View.java:10232)

报错是在ViewPager的onInterceptTouchEvent方法中，网上也有查此类错误的解决，说是：

=========================

修改frameworks\base\core\jni\android_view_MotionEvent.cpp的android_view_MotionEvent_nativeGetAxisValue方法

注释掉

    [java] 
    view plaincopy
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

==============

上为引文出自：https://blog.youkuaiyun.com/eoeandroida/article/details/7954398 点击打开链接

于是乎，自定义View继承ViewPager重写onInterceptTouchEvent方法捕获异常，确实解决了问题：

    @Override
    public boolean onInterceptTouchEvent(MotionEvent event) {
        try {
            return super.onInterceptTouchEvent(event);
        } catch (IllegalArgumentException  e) {
            e.printStackTrace();
        }
        return false ;
    }