ViewPager：java.lang.IllegalArgumentException：如果pointerIndex超出范围 [英] ViewPager: java.lang.IllegalArgumentException: pointerIndex out of range

问题描述

我在写一个code基于什么建议来处理触摸事件<一href="http://neevek.net/posts/2013/10/13/implementing-onInterceptTouchEvent-and-onTouchEvent-for-ViewGroup.html"相对=nofollow>此处。我使用ViewPager作为一个ViewGroup和ListView（我知道 #thisbad ）为片段的子视图。

I am writing an code to handle touch event based on what suggested here. I am using ViewPager as an ViewGroup and ListView(I know #thisbad) as child view of Fragment.

这就是我想实现：

1. 在检测的多点触控事件的子视图
2. 然后通过触摸控制于母公司

不过，虽然通过监听事件从子视图到父视图它给以下错误：

but While passing listener event from child View to Parent view it giving following error:

E/AndroidRuntime(11414): java.lang.IllegalArgumentException:pointerIndex out of range      
E/AndroidRuntime(11414):    at android.view.MotionEvent.nativeGetAxisValue(Native Method)
E/AndroidRuntime(11414):    at android.view.MotionEvent.getX(MotionEvent.java:1979)
E/AndroidRuntime(11414):    at android.support.v4.view.MotionEventCompatEclair.getX(MotionEventCompatEclair.java:32)
E/AndroidRuntime(11414):    at android.support.v4.view.MotionEventCompat$EclairMotionEventVersionImpl.getX(MotionEventCompat.java:91)
E/AndroidRuntime(11414):    at android.support.v4.view.MotionEventCompat.getX(MotionEventCompat.java:219)
E/AndroidRuntime(11414):    at android.support.v4.view.ViewPager.onTouchEvent(ViewPager.java:1971) ..................
E/AndroidRuntime(11414):    at android.view.ViewRootImpl.doConsumeBatchedInput(ViewRootImpl.java:5588)
E/AndroidRuntime(11414):    at android.view.ViewRootImpl$ConsumeBatchedInputRunnable.run(ViewRootImpl.java:5634)
E/AndroidRuntime(11414):    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
E/AndroidRuntime(11414):    at android.view.Choreographer.doCallbacks(Choreographer.java:574)
E/AndroidRuntime(11414):    at android.view.Choreographer.doFrame(Choreographer.java:542)

我问过其他一些职位有像和的here 但他们所使用的指针索引做服用点但对我来说，我只是将控制传递给父（ViewPager）的看法，现在。

I checked with some other post have same issue like and here but all they are using Pointer indexing to do somehting but in my case I am just passing control to parent(ViewPager) view now.

分析：在这里，我检查用的FrameLayout而不是列表视图中的儿童片段。和它的工作没有任何提到issue..but不与ListView控件。

Analysis: Here I checked to use FrameLayout instead to Listview in Child Fragment. and it's working without any mentioned issue..but not with ListView.

设备信息： OS V4.4.4 S5

Device Info: OS V4.4.4 S5.

任何建议！

推荐答案

我不知道为什么MotionEventCompat呼吁MotionEventCompatEclair，就像我在code看见，有MotionEventCompatHoneycomb过载，但我有同样的问题与摩托罗拉XT1040在安卓4.4.4。

I don't know why MotionEventCompat is calling MotionEventCompatEclair, as I saw in the code, there are a MotionEventCompatHoneycomb overload, but I had the same problem with Moto XT1040 in android 4.4.4.

我的解决方案是创建我的版本ViewPager的（我只是复制从Android源整个类），并在MotionEvent.ACTION_MOVE的情况下，方法onInterceptTouchEvent（MotionEvent EV）从更改初始行：

The solution for me was create my version of ViewPager(I just copied the entire class from android source) and in the method onInterceptTouchEvent(MotionEvent ev) in the case of MotionEvent.ACTION_MOVE change the initial lines from:

final int activePointerId = mActivePointerId;
if (activePointerId == INVALID_POINTER) {
    // If we don't have a valid id, the touch down wasn't on content.
    break;
}

final int pointerIndex = MotionEventCompat.findPointerIndex(ev, activePointerId);
final float x = MotionEventCompat.getX(ev, pointerIndex);
final float dx = x - mLastMotionX;
final float xDiff = Math.abs(dx);
final float y = MotionEventCompat.getY(ev, pointerIndex);
final float yDiff = Math.abs(y - mInitialMotionY);

到

final int activePointerId = mActivePointerId;
if (activePointerId == INVALID_POINTER) {
    // If we don't have a valid id, the touch down wasn't on content.
    break;
}

final int pointerIndex = MotionEventCompat.findPointerIndex(ev, activePointerId);
final float x = ev.getX(pointerIndex);
final float dx = x - mLastMotionX;
final float xDiff = Math.abs(dx);
final float y = ev.getY(pointerIndex);
final float yDiff = Math.abs(y - mInitialMotionY);

唯一的变化是在x和y的变量，我改为直接调用MotionEvent的getX和方法的getY，忽略MotionEventCompat。

The only change was in the x and y variables, I changed to call the MotionEvent getX and getY method directly, ignoring the MotionEventCompat.

我的应用程序是最小的API 14，如果你是从14配套的东西previous，我建议你打电话从您的版本最接近的MotionEventCompat。你只需要prevent从调用MotivoEventCompatEclair版本。

My app was minimum api 14, if you are supporting something previous from 14, I suggest to you call the closest MotionEventCompat from your version. You just need to prevent from calling the MotivoEventCompatEclair version.

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