使用 ListAdapter 时出现 ArrayIndexOutOfBoundsException
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【中文标题】使用 ListAdapter 时出现 ArrayIndexOutOfBoundsException【英文标题】:ArrayIndexOutOfBoundsException when using ListAdapter 【发布时间】:2011-08-05 07:10:51 【问题描述】:我将自定义ListAdapter
用于ListView
。我没有动态更改任何内容(查看次数、查看类型、启用/禁用,我阅读了其他帖子,但他们从代码中更改了某些内容)。我必须执行以下操作才能触发异常。向下滚动到列表底部,然后再次向上滚动。在向上滚动动画开始时,我得到了这个异常。
04-14 09:41:43.907: ERROR/androidRuntime(400): FATAL EXCEPTION: main
04-14 09:41:43.907: ERROR/AndroidRuntime(400): java.lang.ArrayIndexOutOfBoundsException
04-14 09:41:43.907: ERROR/AndroidRuntime(400): at android.widget.AbsListView$RecycleBin.addScrapView(AbsListView.java:4540)
04-14 09:41:43.907: ERROR/AndroidRuntime(400): at android.widget.AbsListView.trackMotionScroll(AbsListView.java:3370)
04-14 09:41:43.907: ERROR/AndroidRuntime(400): at android.widget.AbsListView.onTouchEvent(AbsListView.java:2233)
04-14 09:41:43.907: ERROR/AndroidRuntime(400): at android.widget.ListView.onTouchEvent(ListView.java:3446)
04-14 09:41:43.907: ERROR/AndroidRuntime(400): at android.view.View.dispatchTouchEvent(View.java:3885)
04-14 09:41:43.907: ERROR/AndroidRuntime(400): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:903)
04-14 09:41:43.907: ERROR/AndroidRuntime(400): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
04-14 09:41:43.907: ERROR/AndroidRuntime(400): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
04-14 09:41:43.907: ERROR/AndroidRuntime(400): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
04-14 09:41:43.907: ERROR/AndroidRuntime(400): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1691)
04-14 09:41:43.907: ERROR/AndroidRuntime(400): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1125)
04-14 09:41:43.907: ERROR/AndroidRuntime(400): at android.app.Activity.dispatchTouchEvent(Activity.java:2096)
04-14 09:41:43.907: ERROR/AndroidRuntime(400): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1675)
04-14 09:41:43.907: ERROR/AndroidRuntime(400): at android.view.ViewRoot.deliverPointerEvent(ViewRoot.java:2194)
04-14 09:41:43.907: ERROR/AndroidRuntime(400): at android.view.ViewRoot.handleMessage(ViewRoot.java:1878)
04-14 09:41:43.907: ERROR/AndroidRuntime(400): at android.os.Handler.dispatchMessage(Handler.java:99)
04-14 09:41:43.907: ERROR/AndroidRuntime(400): at android.os.Looper.loop(Looper.java:123)
04-14 09:41:43.907: ERROR/AndroidRuntime(400): at android.app.ActivityThread.main(ActivityThread.java:3683)
04-14 09:41:43.907: ERROR/AndroidRuntime(400): at java.lang.reflect.Method.invokeNative(Native Method)
04-14 09:41:43.907: ERROR/AndroidRuntime(400): at java.lang.reflect.Method.invoke(Method.java:507)
04-14 09:41:43.907: ERROR/AndroidRuntime(400): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
04-14 09:41:43.907: ERROR/AndroidRuntime(400): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
04-14 09:41:43.907: ERROR/AndroidRuntime(400): at dalvik.system.NativeStart.main(Native Method)
下面是完整的实现。
public class CompanyDetailsAdapter implements ListAdapter
private Context context;
private LayoutInflater inflater;
private static final class ViewType
private static final int HEADER = 1;
private static final int TEXT = 2;
private static final int ADDRESS = 3;
private static final int REVIEWS = 4;
private static final int PRODUCTS = 5;
//all the cells in the order they appear
private static final class ViewPositions
private static final int CompanyNameHeader = 0;
private static final int CompanyName = 1;
private static final int ContactHeader = 2;
private static final int Phone = 3;
private static final int Website = 4;
private static final int AddressHeader = 5;
private static final int Address = 6;
private static final int DescriptionHeader = 7;
private static final int Description = 8;
private static final int ReviewsHeader = 9;
private static final int Reviews = 10;
private static final int ProductsHeader = 11;
private static final int Products = 12;
//list of cells by types
private static final int[] viewTypes =
ViewType.HEADER, //0
ViewType.TEXT, //1
ViewType.HEADER, //2
ViewType.TEXT, //3
ViewType.TEXT, //4
ViewType.HEADER, //5
ViewType.ADDRESS, //6
ViewType.HEADER, //7
ViewType.TEXT, //8
ViewType.HEADER, //9
ViewType.REVIEWS, //10
ViewType.HEADER, //11
ViewType.PRODUCTS //12
;
//headers
private static final int[] headerPositions =
ViewPositions.CompanyNameHeader,
ViewPositions.ContactHeader,
ViewPositions.AddressHeader,
ViewPositions.DescriptionHeader,
ViewPositions.ReviewsHeader,
ViewPositions.ProductsHeader
;
//header resources for position where needed
private static final int[] headerResources =
R.string.companyName,
0,
R.string.contact,
0,
0,
R.string.address,
0,
R.string.description,
0,
R.string.reviews,
0,
R.string.products,
0
;
//regular texts
private static final int[] textPositions =
ViewPositions.CompanyName,
ViewPositions.Phone,
ViewPositions.Website,
ViewPositions.Description,
;
public CompanyDetailsAdapter(Context context)
this.context = context;
this.inflater = LayoutInflater.from(this.context);
public int getCount()
return viewTypes.length;
public Object getItem(int position)
return null;
public long getItemId(int position)
return position+1;
public int getItemViewType(int position)
return viewTypes[position];
public View getView(int position, View convertView, ViewGroup parent)
if (arrayContains(headerPositions, position))
LinearLayout layout = null;
TextView txtHeader = null;
if (convertView == null)
layout = (LinearLayout)inflater.inflate(R.layout.header_listview,parent, false);
else
layout = (LinearLayout)convertView;
txtHeader = (TextView)layout.findViewById(R.id.txtHeader);
String value = context.getText(headerResources[position]).toString();
txtHeader.setText(value);
return layout;
else if (arrayContains(textPositions, position))
TextView txtText = null;
LinearLayout layout = null;
Company c = Company.getSelectedCompany();
if (convertView == null)
layout = (LinearLayout)inflater.inflate(R.layout.default_text,parent, false);
else
layout = (LinearLayout)convertView;
txtText = (TextView)layout.findViewById(R.id.txtNormalText);
switch (position)
case ViewPositions.CompanyName:
txtText.setText(c.getName());
break;
case ViewPositions.Phone:
txtText.setText(c.getPhone());
break;
case ViewPositions.Website:
txtText.setText(c.getWebsiteString());
break;
case ViewPositions.Description:
txtText.setText(c.getDescription());
break;
return layout;
else
View v = null;
//LinearLayout layout = null;
Company company = Company.getSelectedCompany();
switch (position)
case ViewPositions.Address:
if (convertView == null)
v = (LinearLayout)inflater.inflate(R.layout.adress, parent,false);
else
v = (LinearLayout)convertView;
TextView txtAddress = (TextView)v.findViewById(R.id.txtAddress);
txtAddress.setText(String.format("%s %s %s", company.getCity(),
company.getStreet(), company.getPostalCode()));
break;
case ViewPositions.Products:
if (convertView == null)
v = (LinearLayout)inflater.inflate(R.layout.products, parent,false);
else
v = (LinearLayout)convertView;
v = (LinearLayout)inflater.inflate(R.layout.products, parent,false);
TextView txtNumProducts = (TextView)v.findViewById(R.id.txtNumProducts);
txtNumProducts.setText(String.valueOf(company.getNrProducts()));
break;
case ViewPositions.Reviews:
if (convertView == null)
v = (LinearLayout)inflater.inflate(R.layout.reviews, parent,false);
else
v = (LinearLayout)convertView;
v = (LinearLayout)inflater.inflate(R.layout.reviews, parent,false);
TextView txtNumReviews = (TextView)v.findViewById(R.id.txtNumReviews);
txtNumReviews.setText(String.valueOf(company.getNrReviews()));
RatingBar rating = (RatingBar)v.findViewById(R.id.ratAvg);
rating.setRating(company.getAvgRating());
break;
return v;
public int getViewTypeCount()
return 5;
public boolean hasStableIds()
return true;
public boolean isEmpty()
return false;
public void registerDataSetObserver(DataSetObserver arg0)
public void unregisterDataSetObserver(DataSetObserver arg0)
public boolean areAllItemsEnabled()
return false;
public boolean isEnabled(int position)
if (arrayContains(headerPositions, position)) return false;
return true;
private Boolean arrayContains(int[] array, int element)
for (int i=0; i<array.length; i++)
if (array[i] == element) return true;
return false;
我将来自here 的源附加到Android 2.3.3 库。我没有发现堆栈跟踪没有向我显示的任何其他内容。众所周知,ListView
回收视图。有一个集合包含这些回收的视图。当一个视图消失时,它被添加到那里(我认为)。这发生在at android.widget.AbsListView$RecycleBin.addScrapView(AbsListView.java:4540)
这里的某个地方它给了我一个例外,即某些东西超出了范围。我一点头绪都没有。但是我没有耐心调试另外 1000 行代码,所以我想我现在会使用 ScrollView。
似乎是这一行:(AbsListView.class:4540 mScrapViews[viewType].add(scrap);
mScrapViews 的类型为 private ArrayList<View>[] mScrapViews;
。它是 View
类型的列表数组。我可以尝试观看viewType
和scrap
变量,但它显示errors_during_evaluation
。可能太笨了,无法评估。
【问题讨论】:
能否贴出运行失败的部分代码? 当然我可以发布所有我不知道有什么问题的代码 尝试逐步调试您的代码。这是一个很好的起点:android.widget.ListView.onTouchEvent(ListView.java:3446) 【参考方案1】:发现问题。视图类型必须从 0 开始,我的从 1 开始。
Android 正在使用我提供的视图类型在某处按索引访问数组。 SomeArraySomewhere[myViewType]
这个数组的大小可能等于视图类型的数量。所以这意味着我必须从 0 开始我的视图类型。
【讨论】:
谢谢!我也遇到了同样的问题,找不到原因 +1 表示解决方案。但是您到底在哪里找到了这个SomeArraySomewhere[]
?在适配器的源代码中?
抱歉这是很久以前的事了,我不记得了【参考方案2】:
改变这个:
public int getViewTypeCount()
return 2;
这对我有帮助:
public int getViewTypeCount()
return 3;
说明:
最初我有两种视图类型,但后来在实现中,我添加了第三种。 我开始收到该异常,因为我忘记更新方法 getViewTypeCount() 以返回 3 而不是仅返回 2。
希望这可以帮助某人:)
【讨论】:
【参考方案3】:position
可能是:
null
b:higher then the amount of headerResources
?
在这一行(getView):
String value = context.getText(headerResources[position]).toString();
先学会调试:这里是nice video tutorial
【讨论】:
【参考方案4】:原因,很可能是因为 getItemViewType 方法返回了错误的值!列表视图中的每一行都是一个视图。浏览时 getItemViewType 达到的数量超过了 View 的数量。
怎么办?如何避免问题?
首先确定列表视图中首先显示的视图(行)。滚动时使用模块方程
@Override
public int getItemViewType(int position)
return choseType(position);//function to use modular equation
@Override
public int getViewTypeCount()
return 10;
在这个例子中,有十个视图(10 行)。
private int choseType(int position)
if(position%10==0)
return 0;
else if(position%10==1)
return 1;
else if(position%10==2)
return 2;
else if(position%10==3)
return 3;
else if(position%10==4)
return 4;
else if(position%10==5)
return 5;
else if(position%10==6)
return 6;
else if(position%10==7)
return 7;
else if(position%10==8)
return 8;
else
return 9;
重要
一些用户在另一个关于***的问题上提到了该方法
public int getViewTypeCount() 和 public int getItemViewType(int position) 修复像 Tooglebutton 一样自动启用状态检查 true on scrooling..这是大错误。如果你不想在 scrool 上自动启用就做
toogleButton.setChecked(false);
关于 getView 覆盖方法。
【讨论】:
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