2

我正在编写一个 Android TV 应用程序并遇到了这个问题。在收到事件时，我必须用新行替换 BrowseFragment 中的所有行。我试过的：

mRowsAdapter.clear();
...
mRowsAdapter.add(add new rows here);

其中 mRowsAdapter 是带有 ListRow 项的 ArrayObjectAdapter。还尝试了这种方法：

mRowsAdapter = new ArrayObjectAdapter(new ListRowPresenter());
setAdapter(mRowsAdapter);
mRowsAdapter.add(add new rows here);

以及这个问题的解决方案。它们都不起作用。我一直在获得 IOBE。以下是日志：

                               java.lang.IndexOutOfBoundsException: Index: 7, Size: 0
                                   at java.util.ArrayList.get(ArrayList.java:411)
                                   at android.support.v17.leanback.widget.ArrayObjectAdapter.get(ArrayObjectAdapter.java:56)
                                   at android.support.v17.leanback.app.ListRowDataAdapter.get(ListRowDataAdapter.java:65)
                                   at android.support.v17.leanback.widget.ItemBridgeAdapter.getItemViewType(ItemBridgeAdapter.java:248)
                                   at android.support.v7.widget.RecyclerView$Recycler.validateViewHolderForOffsetPosition(RecyclerView.java:5046)
                                   at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5172)
                                   at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5153)
                                   at android.support.v17.leanback.widget.GridLayoutManager.getViewForPosition(GridLayoutManager.java:971)
                                   at android.support.v17.leanback.widget.GridLayoutManager$2.createItem(GridLayoutManager.java:1464)
                                   at android.support.v17.leanback.widget.SingleRow.appendVisibleItems(SingleRow.java:111)
                                   at android.support.v17.leanback.widget.Grid.appendVisibleItems(Grid.java:371)
                                   at android.support.v17.leanback.widget.GridLayoutManager.appendVisibleItems(GridLayoutManager.java:1702)
                                   at android.support.v17.leanback.widget.GridLayoutManager.fastRelayout(GridLayoutManager.java:1764)
                                   at android.support.v17.leanback.widget.GridLayoutManager.onLayoutChildren(GridLayoutManager.java:1888)
                                   at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3374)
                                   at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3183)
                                   at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3627)
                                   at android.view.View.layout(View.java:17519)
                                   at android.view.ViewGroup.layout(ViewGroup.java:5612)
                                   at android.support.v17.leanback.widget.ScaleFrameLayout.onLayout(ScaleFrameLayout.java:172)
                                   at android.view.View.layout(View.java:17519)
                                   at android.view.ViewGroup.layout(ViewGroup.java:5612)
                                   at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
                                   at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
                                   at android.view.View.layout(View.java:17519)
                                   at android.view.ViewGroup.layout(ViewGroup.java:5612)
                                   at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
                                   at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
                                   at android.view.View.layout(View.java:17519)
                                   at android.view.ViewGroup.layout(ViewGroup.java:5612)
                                   at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
                                   at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
                                   at android.view.View.layout(View.java:17519)
                                   at android.view.ViewGroup.layout(ViewGroup.java:5612)
                                   at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
                                   at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
                                   at android.view.View.layout(View.java:17519)
                                   at android.view.ViewGroup.layout(ViewGroup.java:5612)
                                   at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
                                   at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
                                   at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
                                   at android.view.View.layout(View.java:17519)
                                   at android.view.ViewGroup.layout(ViewGroup.java:5612)
                                   at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
                                   at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
                                   at com.android.internal.policy.DecorView.onLayout(DecorView.java:724)
                                   at android.view.View.layout(View.java:17519)
                                   at android.view.ViewGroup.layout(ViewGroup.java:5612)
                                   at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2342)
                                   at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2069)
                                   at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1246)
                                   at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6301)
                                   at android.view.Choreographer$CallbackRecord.run(Choreographer.java:871)
                                   at android.view.Choreographer.doCallbacks(Choreographer.java:683)
                                   at android.view.Choreographer.doFrame(Choreographer.java:619)
com.cloudify E/AndroidRuntime:     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:857)
                                   at android.os.Handler.handleCallback(Handler.java:751)
                                   at android.os.Handler.dispatchMessage(Handler.java:95)
                                   at android.os.Looper.loop(Looper.java:154)
                                   at android.app.ActivityThread.main(ActivityThread.java:6077)
                                   at java.lang.reflect.Method.invoke(Native Method)
                                   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
                                   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)

请帮忙。谢谢你。

4

3 回答 3

0

尝试这样做：

    mRowsAdapter.clear();
    mRowsAdapter.add（在此处添加新行）；
    mRowsAdapter.notifyArrayItemRangeChanged(0, mRowsAdapter.size());
于 2017-01-03T13:39:08.217 回答
0

由于适配器中的内部对象数组正在尝试使用其自己的大小来确定添加项目的位置，因此您获得了超出范围的索引。

当您调用 .add() 时，它在内部执行此操作 -

/**
 * Adds an item to the end of the list.
 *
 * @param item The item to add to the end of the list.
 */
public void add(Object item) {
    add(mItems.size(), item);
}
/**
 * Inserts an item into this list at the specified index.
 *
 * @param index The index at which the item should be inserted.
 * @param item The item to insert into the list.
 */
public void add(int index, Object item) {
    mItems.add(index, item);
    notifyItemRangeInserted(index, 1);
}

这意味着某些您调用 clear 的方式会暂时使某些内容不正常，并且内部索引与实际情况不同，并且 arraylist 会弹出一个 IOBE。也许尝试使用 add(0, yourArray) 代替。

编辑：

在添加对象之前尝试添加某种验证。就像是：

if((myAdapter.size() - 1) > indexImTryingToAddAt)
{
    myAdapter.addAll(indexImTryingToAddAt, arrayOfObjects);
}
else
{
    Log.d("index is larger than current adapter", indexImTryingToAddAt+"");
}
于 2016-11-03T20:58:29.023 回答
0

我解决类似问题的方式：

如果 Array 为空，则不能将具有设置索引的对象放入 ArrayObjectAdapter。

https://developer.android.com/reference/android/support/v17/leanback/widget/ArrayObjectAdapter

无效添加（int索引，对象项）

在指定索引处将项目插入此适配器。如果索引 > size() 将引发异常。

我不知道我的解决方案有多时尚，但您可以执行以下操作：

用“虚拟”对象填充数组

mRowsAdapter.add(0, new ListRow(new HeaderItem(""), new ArrayObjectAdapter()));
mRowsAdapter.add(1, new ListRow(new HeaderItem(""), new ArrayObjectAdapter()));
mRowsAdapter.add(2, new ListRow(new HeaderItem(""), new ArrayObjectAdapter()));

回调完成后，替换它们：

mRowsAdapter.replace(0, new ListRow(new HeaderItem("List1"), list1));
mRowsAdapter.replace(1, new ListRow(new HeaderItem("List2"), list2));
mRowsAdapter.replace(2, new ListRow(new HeaderItem("List3"), list3));

这样，您还可以将项目计数器添加到 HeaderItem 中：

mRowsAdapter.replace(2, new ListRow(new HeaderItem("List3 (" + list3.size() + ")"), list3));
于 2018-05-02T23:06:46.663 回答