请勿在阅读前将此问题标记为重复。我是java的新手，正在处理一个我正面临着
问题的应用程序java.lang.IndexOutOfBoundsException: Index: 10, Size: 10
当我点击列表的最后一项时。我知道我的数组就像0-9，所以如果我使用10作为数字，那么我就会收到错误。我的代码如下所示
private class Page {
private int mIndx;
private ArrayList<HashMap<String, String>> mQuotes;
private Page(int indx, ArrayList<HashMap<String, String>> quoteList) {
mQuotes = quoteList;
mIndx = indx;
}
private HashMap<String, String> getQuote(int indx) {
return mQuotes.get(indx);
}
}
此函数返回上面调用的错误。现在我试过这样的
private class Page {
public static int postion;
private int mIndx;
private ArrayList<HashMap<String, String>> mQuotes;
private Page(int indx, ArrayList<HashMap<String, String>> quoteList) {
mQuotes = quoteList;
mIndx = indx;
}
private HashMap<String, String> getQuote(int indx) {
if(indx == mQuotes.size())
{
postion = indx- 1;
}
else{
postion = indx;
}
return mQuotes.get(postion);
}
}
这是我的报价方法
private HashMap<String, String> getQuote(int position) {
int pageIndx = ((position + 1) / QuotesListFragment.ITEMS_PER_PAGE) + (((position + 1) % QuotesListFragment.ITEMS_PER_PAGE) > 0 ? 1 : 0);
Page page = mQuotePages.get(pageIndx);
if (page == null) {
page = loadQuotePage(pageIndx);
}
int quoteIndxOfPage = position % QuotesListFragment.ITEMS_PER_PAGE;
return page.getQuote(quoteIndxOfPage);
}
如果我缺少添加
的更多代码public Cursor getQuotesByPage(int quotesType,String author,int pageIndx,int numOfItems){
int offset=(pageIndx-1)*numOfItems;
switch(quotesType){
case 1:
return getQuotes(offset,numOfItems);
case 2:
return getFavoriteQuotes(offset,numOfItems);
case 3:
return getAuthorQuotes(author,offset,numOfItems);
case 4:
return getAuthorQuotesTopLiked(author, offset, numOfItems);
case 5:
return getAuthorQuotesTopShared(author, offset, numOfItems);
case 6:
return getQuotesTopLiked(offset,numOfItems);
case 7:
return getQuotesTopShared(offset,numOfItems);
}
return null;
}
public Cursor getQuotes(int offset,int limit) {
// Select All Query
if (String.valueOf(offset).equals("50000")) {
String query_count = "SELECT COUNT(" + QU_ID + ") AS count FROM "
+ TABLE_QUOTES;
Cursor c_count = database.rawQuery(query_count, null);
c_count.moveToFirst();
Integer count = c_count.getInt(c_count.getColumnIndex("count"));
limit =count;// String.valueOf(count);
}
String query = "SELECT * FROM " + TABLE_QUOTES + " JOIN "
+ TABLE_AUTHORS + " ON " + QU_AUTHOR + " = " + AU_WEB_ID
+ " ORDER BY " + QU_ID + " DESC "+ " LIMIT " + offset+","+limit;
//Log.i("query",query);
Cursor cursor = database.rawQuery(query, null);
cursor.moveToFirst();
return cursor;
}
完整日志在这里
Process: com.karopass.gujarati_status, PID: 6865
java.lang.IndexOutOfBoundsException: Index: 10, Size: 10
at java.util.ArrayList.get(ArrayList.java:411)
at com.karopass.gujarati_status.material.QuoteViewActivity$Page.getQuote(QuoteViewActivity.java:703)
at com.karopass.gujarati_status.material.QuoteViewActivity$Page.access$1000(QuoteViewActivity.java:690)
at com.karopass.gujarati_status.material.QuoteViewActivity.getQuote(QuoteViewActivity.java:653)
at com.karopass.gujarati_status.material.QuoteViewActivity.access$800(QuoteViewActivity.java:48)
at com.karopass.gujarati_status.material.QuoteViewActivity$QuoteFragmentAdapter.getItem(QuoteViewActivity.java:632)
at android.support.v4.app.FragmentStatePagerAdapter.instantiateItem(FragmentStatePagerAdapter.java:109)
at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:1034)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1248)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1116)
at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1642)
at android.view.View.measure(View.java:19965)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
at android.view.View.measure(View.java:19965)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:911)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:640)
at android.view.View.measure(View.java:19965)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
at android.view.View.measure(View.java:19965)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6087)
at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:714)
at android.support.design.widget.HeaderScrollingViewBehavior.onMeasureChild(HeaderScrollingViewBehavior.java:90)
at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onMeasureChild(AppBarLayout.java:1391)
at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:784)
at android.view.View.measure(View.java:19965)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6087)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:139)
at android.view.View.measure(View.java:19965)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6087)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1464)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:758)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:640)
at android.view.View.measure(View.java:19965)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6087)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at android.view.View.measure(View.java:19965)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6087)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1464)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:758)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:640)
at android.view.View.measure(View.java:19965)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6087)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at com.android.internal.policy.DecorView.onMeasure(DecorView.java:689)
at android.view.View.measure(View.java:19965)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2309)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1392)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1645)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1280)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6432)
07-12 09:23:54.208 6865-6865/com.karopass.gujarati_status E/AndroidRuntime: at android.view.Choreographer$CallbackRecord.run(Choreographer.java:874)
at android.view.Choreographer.doCallbacks(Choreographer.java:686)
at android.view.Choreographer.doFrame(Choreographer.java:621)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:860)
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:6290)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
但是现在两次显示我的最后一项......我在某个地方错了......请帮助我解决问题....我能做些什么来解决这个难题......我读了很多stackflow中的类似问题但无法修复它。 感谢
答案 0 :(得分：-1)
如果大小为10，则表示您可以从0到9个位置进行迭代。 （总共有10个元素。）
由于这个原因，它打印了最后一个元素2次。
当indx为9时（指向hashmap的最后一个元素），它将进入else条件并返回最后一个元素。
下次当索引为10时，它将进入if情况并且你正在执行 postion = indx- 1; ，这也将返回位置9上的元素。
答案 1 :(得分：-2)
指数：10，大小：10
索引从零开始枚举，所以当size为10时，max allowed index为9，因此这一行：
if(indx == mQuotes.size())
错误，因为它应该是
if(indx == mQuotes.size()-1)
答案 2 :(得分：-2)
我认为你在某种循环中调用Page类的getQuote（）函数，所以你的索引参数应该始终具有从0到mQuotes.size（）的值 - 1然后你可以简单地做下方。
private HashMap<String, String> getQuote(int indx) { if(indx>= mQuotes.size()) { return null;} else{return mQuotes.get(indx); }}