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我有一个应用程序在打开时会加载一个列表视图，但是我得到了一个数组索引越界异常，没有关于问题所在的线索。它试图在某个地方访问 index=-1，但我不知道在哪里。

该应用程序从数据库加载作业信息，将它们放入 ArrayList 中的单独作业对象中，然后从那里将其加载到 ListView 中。我真的不知道异常来自哪里，我检查了我所有的代码。列表中只有 1 项作业，但应用程序拒绝打开并在我尝试打开时强制关闭。这是 LogCat 输出

谢谢

LogCat 输出

01-11 16:38:43.644: E/AndroidRuntime(7267): FATAL EXCEPTION: main
01-11 16:38:43.644: E/AndroidRuntime(7267): java.lang.ArrayIndexOutOfBoundsException: length=29; index=-1
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.text.StaticLayout.calculateEllipsis(StaticLayout.java:738)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.text.StaticLayout.out(StaticLayout.java:702)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.text.StaticLayout.generate(StaticLayout.java:410)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.text.StaticLayout.<init>(StaticLayout.java:140)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.widget.TextView.makeSingleLayout(TextView.java:5888)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.widget.TextView.makeNewLayout(TextView.java:5745)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.widget.TextView.onMeasure(TextView.java:6102)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.view.View.measure(View.java:15513)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:645)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:425)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.view.View.measure(View.java:15513)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4827)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1052)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.widget.LinearLayout.onMeasure(LinearLayout.java:590)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.view.View.measure(View.java:15513)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.widget.ListView.measureScrapChild(ListView.java:1183)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.widget.ListView.measureHeightOfChildren(ListView.java:1248)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.widget.ListView.onMeasure(ListView.java:1158)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.view.View.measure(View.java:15513)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4827)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.view.View.measure(View.java:15513)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4827)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.view.View.measure(View.java:15513)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.widget.LinearLayout.measureVertical(LinearLayout.java:847)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.view.View.measure(View.java:15513)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4827)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2176)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.view.View.measure(View.java:15513)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1874)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1089)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1265)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.view.Choreographer.doCallbacks(Choreographer.java:562)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.view.Choreographer.doFrame(Choreographer.java:532)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.os.Handler.handleCallback(Handler.java:725)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.os.Handler.dispatchMessage(Handler.java:92)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.os.Looper.loop(Looper.java:137)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at android.app.ActivityThread.main(ActivityThread.java:5039)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at java.lang.reflect.Method.invokeNative(Native Method)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at java.lang.reflect.Method.invoke(Method.java:511)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
01-11 16:38:43.644: E/AndroidRuntime(7267):     at dalvik.system.NativeStart.main(Native Method)

从数据库加载

public ArrayList<HomeworkItem> getHomeworks() {
        String[] columns = new String[] { KEY_ROWID, KEY_TITLE, KEY_SUBJECT,
                KEY_DUE_DAY, KEY_DUE_MONTH, KEY_DUE_YEAR, KEY_NOTES,
                KEY_REMINDER_ONE, KEY_REMINDER_TWO };
        Cursor c = ourDatabase.query(DATABASE_TABLE, columns, null, null, null,
                null, null);
        ArrayList<HomeworkItem> hwks = new ArrayList<HomeworkItem>();

        int id = c.getColumnIndex(KEY_ROWID);
        int iTitle = c.getColumnIndex(KEY_TITLE);
        int iSub = c.getColumnIndex(KEY_SUBJECT);
        int iDay = c.getColumnIndex(KEY_DUE_DAY);
        int iMonth = c.getColumnIndex(KEY_DUE_MONTH);
        int iYear = c.getColumnIndex(KEY_DUE_YEAR);
        int iNotes = c.getColumnIndex(KEY_NOTES);
        int iOne = c.getColumnIndex(KEY_REMINDER_ONE);
        int iTwo = c.getColumnIndex(KEY_REMINDER_TWO);

        for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) {
            HomeworkItem h = new HomeworkItem();
            h.id = c.getInt(id);
            h.title = c.getString(iTitle);
            h.subject = c.getString(iSub);
            h.day = Integer.parseInt(c.getString(iDay));
            h.month = Integer.parseInt(c.getString(iMonth));
            h.year = Integer.parseInt(c.getString(iYear));
            h.notes = c.getString(iNotes);
            h.late = h.isLate();

            h.oneDayReminder = Boolean.parseBoolean(c.getString(iOne));
            h.twoDayReminder = Boolean.parseBoolean(c.getString(iTwo));
            hwks.add(h);
        }
        return hwks;
    }

ListView 适配器

public class MyAdapter extends BaseAdapter { // adapter for list

        public MyAdapter(Context c) {

        }

        public int getCount() {
            // TODO Auto-generated method stub
            Log.d("hwk", hwks.size()+" is the size");
            return hwks.size();
        }

        public Object getItem(int position) {
            // TODO Auto-generated method stub
            Log.d("hwk", position+" being accessed");
            return position;
        }

        public long getItemId(int position) {
            // TODO Auto-generated method stub
            Log.d("hwk", position+" being accessed");
            return position;
        }

        public View getView(int position, View convertView, ViewGroup parent) {
            // TODO Auto-generated method stub
            View v = convertView; // inflate the list
            TextView title, subject, dueDate, listLate;

            if (v == null) {
                LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                v = vi.inflate(R.layout.list, null);
                Log.d("hwk", "v inflated");
            }
            title = (TextView) v.findViewById(R.id.listTitle); // get the id's
                                                                // of fields
            subject = (TextView) v.findViewById(R.id.listSubject);
            dueDate = (TextView) v.findViewById(R.id.listDueDate);
            listLate = (TextView) v.findViewById(R.id.listLate);
            Log.d("hwk", "got views");

            title.setText(hwks.get(position).title);
            subject.setText(hwks.get(position).subject);
            String date = hwks.get(position).day + "/"
                    + (hwks.get(position).month + 1) + "/"
                    + hwks.get(position).year;
            dueDate.setText(date);
            Log.d("hwk", "some text set");

            if (hwks.get(position).late) { // set if they are late or not
                if (hwks.get(position).isToday()) {
                    listLate.setTextColor(Color.rgb(255, 165, 0));
                    listLate.setText("Due Today!");
                } else {
                    listLate.setTextColor(Color.RED);
                    listLate.setText("Late");
                }
            } else {
                listLate.setTextColor(Color.GREEN);
                listLate.setText("Ongoing");
            }
            Log.d("hwk", "returning v");
            return v;
        }

    }

编辑：此外，当我第一次在应用程序中添加家庭作业时，ListView 工作，它会刷新 ListView 并将家庭作业添加到其中。发生这种情况时，我完全重新加载了主 Activity，因此在应用程序关闭一次后打开它似乎是一个问题。

编辑 2：我从应用程序中删除了数据，添加了一个新的家庭作业，现在我无法重新创建问题.. 可能是什么原因造成的？！

编辑 3：检测到问题。这与一些文本有关。我已经发现，当我将“标题”设置为“二项式展开”时，它重新创建了我之前在作业也称为“二项式展开”时遇到的错误。是否与尝试将该字符串放在 TextView 中并且文本太大有关？

我已经扩展了 TextView 的宽度，它停止了错误。当我扩展文本时，我又遇到了问题。一定是文本视图溢出的问题。我可以设置任何 TextView 属性来阻止它吗？

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4 回答 4

10

这是由在没有on 的 a 上设置android:ellipsize="middle"（或start）引起的。TextViewandroid:singleLine="true"

例如，以下因此错误而崩溃：

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:ellipsize="middle"
    android:maxLines="1"
    android:text="blahblahblahblahblahblahblahblahblahbla---go really long" />

但以下没有：

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:ellipsize="middle"
    android:singleLine="true"
    android:text="blahblahblahblahblahblahblahblahblahbla---go really long" />

参考：https ://code.google.com/p/android/issues/detail?id=33868

注意：singleLine是一个已弃用的属性，但仍适用于 Jelly Bean。

于 2013-05-30T19:31:10.930 回答
0

您的问题出在 getView 方法中，每当您滚动数组时都会调用此方法，因此请确保在执行任何逻辑之前检查视图是否不为空。

于 2013-01-11T17:01:06.243 回答
0

在 CursorAdapter 的构造函数中检查您的布局和光标列名数组长度。当两个数组的长度不匹配时，会导致ArrayOutOfBoundsException.

于 2013-10-25T12:12:09.980 回答
0

这肯定和文本视图的椭圆逻辑有关，与适配器代码无关。

于 2014-04-16T20:07:05.743 回答