Android - java.lang.IndexOutOfBoundsException：无效的项目位置 0(0)。项目数：0答案

【问题标题】：Android - java.lang.IndexOutOfBoundsException: Invalid item position 0(0). Item count:0Android - java.lang.IndexOutOfBoundsException：无效的项目位置 0(0)。项目数：0
【发布时间】：2016-08-24 08:18:42
【问题描述】：

我的日志中出现了这个异常 -

 java.lang.IndexOutOfBoundsException: Invalid item position 0(0). Item count:0
            at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4622)
            at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4617)
            at com.jivemap.app.CustomizedViews.MyLinearLayoutManager.measureScrapChild(MyLinearLayoutManager.java:66)
            at com.jivemap.app.CustomizedViews.MyLinearLayoutManager.onMeasure(MyLinearLayoutManager.java:30)
            at android.support.v7.widget.RecyclerView.onMeasure(RecyclerView.java:2614)
            at android.view.View.measure(View.java:15318)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816)
            at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1413)
            at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1061)
            at android.widget.LinearLayout.onMeasure(LinearLayout.java:599)
            at android.view.View.measure(View.java:15318)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816)
            at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1413)
            at android.widget.LinearLayout.measureVertical(LinearLayout.java:704)
            at android.widget.LinearLayout.onMeasure(LinearLayout.java:597)
            at android.view.View.measure(View.java:15318)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816)
            at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1413)
            at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1061)
            at android.widget.LinearLayout.onMeasure(LinearLayout.java:599)
            at android.view.View.measure(View.java:15318)
            at android.widget.ListView.setupChild(ListView.java:1849)
            at android.widget.ListView.makeAndAddView(ListView.java:1764)
            at android.widget.ListView.fillSpecific(ListView.java:1320)
            at android.widget.ListView.layoutChildren(ListView.java:1635)
            at android.widget.AbsListView.onLayout(AbsListView.java:2141)
            at android.view.View.layout(View.java:13874)
            at android.view.ViewGroup.layout(ViewGroup.java:4364)
            at android.support.v4.widget.SwipeRefreshLayout.onLayout(SwipeRefreshLayout.java:596)
            at android.view.View.layout(View.java:13874)
            at android.view.ViewGroup.layout(ViewGroup.java:4364)
            at android.support.v4.view.ViewPager.onLayout(ViewPager.java:1695)
            at android.view.View.layout(View.java:13874)
            at android.view.ViewGroup.layout(ViewGroup.java:4364)
            at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1672)
            at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1530)
            at android.widget.LinearLayout.onLayout(LinearLayout.java:1443)
            at android.view.View.layout(View.java:13874)
            at android.view.ViewGroup.layout(ViewGroup.java:4364)
            at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
            at android.view.View.layout(View.java:13874)
            at android.view.ViewGroup.layout(ViewGroup.java:4364)
            at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1672)
            at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1530)
            at android.widget.LinearLayout.onLayout(LinearLayout.java:1443)
            at android.view.View.layout(View.java:13874)
            at android.view.ViewGroup.layout(ViewGroup.java:4364)
            at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
            at android.view.View.layout(View.java:13874)
            at android.view.ViewGroup.layout(ViewGroup.java:4364)
            at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1672)
            at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1530)
            at android.widget.LinearLayout.onLayout(LinearLayout.java:1443)
            at android.view.View.layout(View.java:13874)
            at android.view.ViewGroup.layout(ViewGroup.java:4364)
            at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
            at android.view.View.layout(View.java:13874)
            at android.view.ViewGroup.layout(ViewGroup.java:4364)
            at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
            at android.view.View.layout(View.java:13874)
            at android.view.ViewGroup.layout(ViewGroup.java:4364)
            at android.widget.FrameLayout.onLayout(FrameLayout.java:448)

我遇到了这个错误 -

View view = recycler.getViewForPosition(position);

这里，在自定义LinearLayoutManager这个方法中——

  private void measureScrapChild(RecyclerView.Recycler recycler, int position, int widthSpec,
                                   int heightSpec, int[] measuredDimension) {



        View view = recycler.getViewForPosition(position);
        if (view != null) {
            RecyclerView.LayoutParams p = (RecyclerView.LayoutParams) view.getLayoutParams();
            int childWidthSpec = ViewGroup.getChildMeasureSpec(widthSpec,
                    getPaddingLeft() + getPaddingRight(), p.width);
            int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec,
                    getPaddingTop() + getPaddingBottom(), p.height);
            view.measure(childWidthSpec, childHeightSpec);
            measuredDimension[0] = view.getMeasuredWidth() + p.leftMargin + p.rightMargin;
            measuredDimension[1] = view.getMeasuredHeight() + p.bottomMargin + p.topMargin;
            recycler.recycleView(view);

        }
    }

以前，它运行良好。我最近将 targetSdkVersion 更改为 23（Marshmallow），以及支持 lib 的版本。可能是出于同样的原因。

请指导我，如何解决这个问题。

【问题讨论】：

你在某处使用过notifyDataSetChanged 吗？
不，我没有在任何地方使用 notifyDataSetChanged。但我在 RecyclerView 上调用 viewTreeObserver，
改用findViewByPosition会不会受影响？
不，我不认为。作为我到达那里的位置，在方法中 - measureScrapChild 是 0
我想，我必须尽量避免得到 0

标签： android android-recyclerview indexoutofboundsexception android-6.0-marshmallow target-sdk

【解决方案1】：

我遇到了同样的问题，我找到了更好的方法来解决它。

在自定义 LayoutManager 的构造函数中调用 setAutoMeasureEnabled(false);。

API 级别 27 之后 setAutoMeasureEnabled() 已弃用。因此，只需在您的自定义 LinearLayoutManager 中覆盖此方法

@Override
public boolean isAutoMeasureEnabled() {
    return false;
}

【讨论】：

在将 RecyclerView 从 v7:21.0.0 更新到 v7:27.0.2 后，我遇到了这个问题。通过使用建议的解决方案，它终于奏效了。他们必须从 v7:22 更改了 RecyclerView 的默认行为。谢谢。
自 v7:27.1.0 起，此方法已被弃用。你应该在你的实现中覆盖isAutoMeasureEnabled()。 developer.android.com/reference/android/support/v7/widget/…

【解决方案2】：

终于解决了:)

更换

编译'com.android.support:recyclerview-v7:23.2.1'

到

编译'com.android.support:recyclerview-v7:22.+'

工作。

不确定，这是否是完美的解决方案，但它对我有用。

【讨论】：

不行，需要用构建工具编译 23.