Android - ViewPager使用PagerAdapter，instantiateItem时出现IndexOutOfBoundsException

这个问题困扰我有一个礼拜了、今天终于解决之、

     感谢：http://stackoverflow.com/questions/9402970/android-viewpager-throwing-indexoutofbounds-exception-when-setting-current-item

     报错信息如下：

[java] view plain copy print ?

1. 04-11 15:01:29.092: E/AndroidRuntime(607): FATAL EXCEPTION: main  
2. 04-11 15:01:29.092: E/AndroidRuntime(607): java.lang.IndexOutOfBoundsException: index=3 count=2  
3. 04-11 15:01:29.092: E/AndroidRuntime(607):      at android.view.ViewGroup.addInArray(ViewGroup.java:2044)  
4. 04-11 15:01:29.092: E/AndroidRuntime(607):      at android.view.ViewGroup.addViewInner(ViewGroup.java:1988)  
5. 04-11 15:01:29.092: E/AndroidRuntime(607):      at android.view.ViewGroup.addView(ViewGroup.java:1865)  
6. 04-11 15:01:29.092: E/AndroidRuntime(607):      at android.support.v4.view.ViewPager.addView(ViewPager.java:920)  
7. 04-11 15:01:29.092: E/AndroidRuntime(607):      at android.view.ViewGroup.addView(ViewGroup.java:1822)  
8. 04-11 15:01:29.092: E/AndroidRuntime(607):      at com.ynet.ilive.views.BrowsePicturesView$Adapter.instantiateItem(BrowsePicturesView.java:272)  
9. 04-11 15:01:29.092: E/AndroidRuntime(607):      at android.support.v4.view.PagerAdapter.instantiateItem(PagerAdapter.java:110)  
10. 04-11 15:01:29.092: E/AndroidRuntime(607):      at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:649)  
11. 04-11 15:01:29.092: E/AndroidRuntime(607):      at android.support.v4.view.ViewPager.populate(ViewPager.java:783)  
12. 04-11 15:01:29.092: E/AndroidRuntime(607):      at android.support.v4.view.ViewPager.completeScroll(ViewPager.java:1280)  
13. 04-11 15:01:29.092: E/AndroidRuntime(607):      at android.support.v4.view.ViewPager.computeScroll(ViewPager.java:1176)  
14. 04-11 15:01:29.092: E/AndroidRuntime(607):      at android.view.ViewGroup.drawChild(ViewGroup.java:1556)  
15. 04-11 15:01:29.092: E/AndroidRuntime(607):      at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)  
16. 04-11 15:01:29.092: E/AndroidRuntime(607):      at android.view.View.draw(View.java:6743)  
17. 04-11 15:01:29.092: E/AndroidRuntime(607):      at android.view.ViewGroup.drawChild(ViewGroup.java:1640)  
18. 04-11 15:01:29.092: E/AndroidRuntime(607):      at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)  
19. 04-11 15:01:29.092: E/AndroidRuntime(607):      at android.view.View.draw(View.java:6743)  
20. 04-11 15:01:29.092: E/AndroidRuntime(607):      at android.widget.FrameLayout.draw(FrameLayout.java:352)  
21. 04-11 15:01:29.092: E/AndroidRuntime(607):      at android.view.ViewGroup.drawChild(ViewGroup.java:1640)  
22. 04-11 15:01:29.092: E/AndroidRuntime(607):      at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)  
23. 04-11 15:01:29.092: E/AndroidRuntime(607):      at android.view.View.draw(View.java:6743)  
24. 04-11 15:01:29.092: E/AndroidRuntime(607):      at android.widget.FrameLayout.draw(FrameLayout.java:352)  
25. 04-11 15:01:29.092: E/AndroidRuntime(607):      at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1842)  
26. 04-11 15:01:29.092: E/AndroidRuntime(607):      at android.view.ViewRoot.draw(ViewRoot.java:1407)  
27. 04-11 15:01:29.092: E/AndroidRuntime(607):      at android.view.ViewRoot.performTraversals(ViewRoot.java:1163)  
28. 04-11 15:01:29.092: E/AndroidRuntime(607):      at android.view.ViewRoot.handleMessage(ViewRoot.java:1727)  
29. 04-11 15:01:29.092: E/AndroidRuntime(607):      at android.os.Handler.dispatchMessage(Handler.java:99)  
30. 04-11 15:01:29.092: E/AndroidRuntime(607):      at android.os.Looper.loop(Looper.java:123)  
31. 04-11 15:01:29.092: E/AndroidRuntime(607):      at android.app.ActivityThread.main(ActivityThread.java:4627)  
32. 04-11 15:01:29.092: E/AndroidRuntime(607):      at java.lang.reflect.Method.invokeNative(Native Method)  
33. 04-11 15:01:29.092: E/AndroidRuntime(607):      at java.lang.reflect.Method.invoke(Method.java:521)  
34. 04-11 15:01:29.092: E/AndroidRuntime(607):      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)  
35. 04-11 15:01:29.092: E/AndroidRuntime(607):      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)  
36. 04-11 15:01:29.092: E/AndroidRuntime(607):      at dalvik.system.NativeStart.main(Native Method)  

PagerAdapter中instantiateItem的代码如下：

[java] view plain copy print ?

1. @Override  
2.           public Object instantiateItem(View container, int position) {  
3.                Log.i(TAG, "instantiateItem: - position: " + position);  
4.   
5.                if (mDrawables.size() < position) {  
6.                     return null;  
7.                }  
8.   
9.                // 初始化  
10.   
11.                View view = mInflater.inflate(R.layout.browse_pics, null);  
12.   
13.                mImg = (ImageView) view.findViewById(R.id.browse_pics_img);  
14.                mIndicator = (TextView) view  
15.                          .findViewById(R.id.browse_pics_indicator);  
16.                mDigest = (TextView) view.findViewById(R.id.browse_pics_title);  
17.   
18.                StringBuilder pageIndicator = new StringBuilder();  
19.                pageIndicator.append(position + 1);  
20.                pageIndicator.append("/");  
21.                pageIndicator.append(mImgsCount);  
22.   
23.                mIndicator.setText(pageIndicator.toString());  
24.                if (null != mNews.getDigest() && !mNews.getDigest().equals("")) {  
25.                     mDigest.setText(mNews.getDigest());  
26.                } else {  
27.                     mDigest.setText(mNews.getTitle());  
28.                }  
29.                mImg.setImageDrawable(mDrawables.get(position));  
30.   
31.                Log.i(TAG, "mDrawables size: " + mDrawables.size() + ", position: "  
32.                          + position);  
33.   
34.                // 注意一定要填0，否则报错：IndexOutOfBoundsException  
35.                // 详细请看：http://stackoverflow.com/questions/9402970/android-viewpager-throwing-indexoutofbounds-exception-when-setting-current-item  
36.                ((ViewPager) container).addView(view, 0);  
37.                //((ViewPager) container).addView(view, position); 这样会报错，错误信息如上所示  
38.   
39.                return view;  
40.           } 
    

转自 http://blog.csdn.net/xixinyan/article/details/7451828