Android阵列出界异常

Question

不知何故，我在编译时总是走出界限。我知道我的数组中有10个元素。我已经尝试把确切的数量作为迭代值和数组的长度。但我仍然过去。

package com.hb.examples; 

import java.util.Locale; 
import android.annotation.SuppressLint; 
import android.app.ListActivity; 
import android.content.Context; 
import android.graphics.Color; 
import android.os.Build; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.view.ViewGroup; 
import android.widget.ArrayAdapter; 
import android.widget.ListView; 
import android.widget.SectionIndexer; 
import android.widget.TextView; 
import android.widget.Toast; 

import com.hb.examples.pinnedsection.R; 
import com.hb.views.PinnedSectionListView; 
import com.hb.views.PinnedSectionListView.PinnedSectionListAdapter; 

public class PinnedSectionListActivity extends ListActivity implements OnClickListener { 

    static class SimpleAdapter extends ArrayAdapter<Item> implements PinnedSectionListAdapter { 

     private static final int[] COLORS = new int[] { 
      R.color.green_light, 
      R.color.orange_light, 
      R.color.blue_light, 
      R.color.red_light }; 

     public SimpleAdapter(Context context, int resource, int textViewResourceId) { 
      super(context, resource, textViewResourceId); 

      //final int sectionsNumber = 'Z' - 'A' + 1; 
      final int sectionsNumber = 'Z' - 'A' + 1; 

      prepareSections(sectionsNumber); 

      int sectionPosition = 0, listPosition = 0; 

      for (int i=0; i< sectionsNumber; i++) { 

       String title = null; 

       final String []country = { 
         "Korean", "Japanese", "Chinese", "Cambodian", "Loas", "Taiwamese" 
       }; 


       final String [] CATEGORY = { 
        "Language", 
        "sports", 
        "love", 
        "luxury", 
        "vacation", 
        "games", 
        "home", 
        "travel", 
        "electronics", 
        "movies", 
       }; 

       switch (('A' + i)) { 
       case ('A' + 0): 
        title = country[0]; 
        break; 
       case ('A' + 1): 
        title = country[1]; 
        break; 
       case ('A' + 2): 
        title = country[2]; 
        break; 
       case ('A' + 3): 
        title = country[3]; 
        break; 
       case ('A' + 4): 
        title = country[4]; 
        break; 
       case ('A' + 5): 
        title = country[5]; 
        break; 
       default: 
        break; 
       } 

       //Create a new Item class with section header and Name 
       Item section = new Item(Item.SECTION, title + i); 
       //Item section = new Item(Item.SECTION, String.valueOf((char)('A' + i))); 

       section.sectionPosition = sectionPosition; 
       section.listPosition = listPosition++; 
       onSectionAdded(section, sectionPosition); 
       add(section); 

       final int itemsNumber = CATEGORY.length; 

       //(int) Math.abs((Math.cos(2f*Math.PI/3f * sectionsNumber/(i+1f)) * 25f)); 

       // For loop to iterate the exact number of itemNumber 
       for (int j = 0;j < CATEGORY.length;j++) { 
        //Item item = new Item(Item.ITEM, section.text.toUpperCase(Locale.KOREA) + " - " + j); 
        Item item = new Item(Item.ITEM, CATEGORY[i]); 
        item.sectionPosition = sectionPosition; 
        item.listPosition = listPosition++; 
        add(item); 
       } 

       sectionPosition++; 
      } 
     } 

这里是logcat输出。

03-03 22:15:55.075: E/AndroidRuntime(19731): FATAL EXCEPTION: main 
03-03 22:15:55.075: E/AndroidRuntime(19731): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.hb.examples.pinnedsection/com.hb.examples.PinnedSectionListActivity}: java.lang.ArrayIndexOutOfBoundsException: length=10; index=10 
03-03 22:15:55.075: E/AndroidRuntime(19731): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2266) 
03-03 22:15:55.075: E/AndroidRuntime(19731): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2316) 
03-03 22:15:55.075: E/AndroidRuntime(19731): at android.app.ActivityThread.access$600(ActivityThread.java:150) 
03-03 22:15:55.075: E/AndroidRuntime(19731): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1298) 
03-03 22:15:55.075: E/AndroidRuntime(19731): at android.os.Handler.dispatchMessage(Handler.java:99) 
03-03 22:15:55.075: E/AndroidRuntime(19731): at android.os.Looper.loop(Looper.java:213) 
03-03 22:15:55.075: E/AndroidRuntime(19731): at android.app.ActivityThread.main(ActivityThread.java:5225) 
03-03 22:15:55.075: E/AndroidRuntime(19731): at java.lang.reflect.Method.invokeNative(Native Method) 
03-03 22:15:55.075: E/AndroidRuntime(19731): at java.lang.reflect.Method.invoke(Method.java:525) 
03-03 22:15:55.075: E/AndroidRuntime(19731): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
03-03 22:15:55.075: E/AndroidRuntime(19731): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602) 
03-03 22:15:55.075: E/AndroidRuntime(19731): at dalvik.system.NativeStart.main(Native Method) 
03-03 22:15:55.075: E/AndroidRuntime(19731): Caused by: java.lang.ArrayIndexOutOfBoundsException: length=10; index=10 
03-03 22:15:55.075: E/AndroidRuntime(19731): at com.hb.examples.PinnedSectionListActivity$SimpleAdapter.<init>(PinnedSectionListActivity.java:124) 
03-03 22:15:55.075: E/AndroidRuntime(19731): at com.hb.examples.PinnedSectionListActivity.initializeAdapter(PinnedSectionListActivity.java:338) 
03-03 22:15:55.075: E/AndroidRuntime(19731): at com.hb.examples.PinnedSectionListActivity.initializeHeaderAndFooter(PinnedSectionListActivity.java:326) 
03-03 22:15:55.075: E/AndroidRuntime(19731): at com.hb.examples.PinnedSectionListActivity.onCreate(PinnedSectionListActivity.java:242) 
03-03 22:15:55.075: E/AndroidRuntime(19731): at android.app.Activity.performCreate(Activity.java:5133) 
03-03 22:15:55.075: E/AndroidRuntime(19731): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
03-03 22:15:55.075: E/AndroidRuntime(19731): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2230) 

Answer 1

你的问题似乎在这里：

for (int j = 0;j < CATEGORY.length;j++) { 
     //Item item = new Item(Item.ITEM, section.text.toUpperCase(Locale.KOREA) + " - " + j); 
     Item item = new Item(Item.ITEM, CATEGORY[i]); 

您使用迭代变量j，但你使用i作为指标。

也巨贵switch代码可以减少这样

if (i<=5) 
    title = country[i]; 

此外，logcat的说，这是无法创建活动，所以这个问题可能是你的onCreate()方法。如果你调用你从onCreate发布的代码，那么我在这里写的代码可以解决你的问题，但也许你正在做一些你没有发布的其他数组操作。