我有一個ViewPager有三個項目.我試圖設置ViewPager查看最右邊的頁面(這將是第二個元素).這是返回IndexOutOfBounds異常,雖然我知道索引應該在邊界.這是確切的堆棧：

02-22 12:22:50.256: E/AndroidRuntime(384): FATAL EXCEPTION: main

02-22 12:22:50.256: E/AndroidRuntime(384): java.lang.IndexOutOfBoundsException: index=1 count=0

02-22 12:22:50.256: E/AndroidRuntime(384): at android.view.ViewGroup.addInArray(ViewGroup.java:2050)

02-22 12:22:50.256: E/AndroidRuntime(384): at android.view.ViewGroup.addViewInner(ViewGroup.java:1994)

02-22 12:22:50.256: E/AndroidRuntime(384): at android.view.ViewGroup.addViewInLayout(ViewGroup.java:1958)

02-22 12:22:50.256: E/AndroidRuntime(384): at android.view.ViewGroup.addViewInLayout(ViewGroup.java:1939)

02-22 12:22:50.256: E/AndroidRuntime(384): at android.support.v4.view.ViewPager.addView(ViewPager.java:917)

02-22 12:22:50.256: E/AndroidRuntime(384): at android.view.ViewGroup.addView(ViewGroup.java:1828)

02-22 12:22:50.256: E/AndroidRuntime(384): at us.tagverse.pagertest.MasterActivity$PAdapter.instantiateItem(MasterActivity.java:518)

02-22 12:22:50.256: E/AndroidRuntime(384): at android.support.v4.view.PagerAdapter.instantiateItem(PagerAdapter.java:110)

02-22 12:22:50.256: E/AndroidRuntime(384): at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:649)

02-22 12:22:50.256: E/AndroidRuntime(384): at android.support.v4.view.ViewPager.populate(ViewPager.java:783)

02-22 12:22:50.256: E/AndroidRuntime(384): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1016)

02-22 12:22:50.256: E/AndroidRuntime(384): at android.view.View.measure(View.java:8313)

02-22 12:22:50.256: E/AndroidRuntime(384): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)

02-22 12:22:50.256: E/AndroidRuntime(384): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1017)

02-22 12:22:50.256: E/AndroidRuntime(384): at android.widget.LinearLayout.measureVertical(LinearLayout.java:386)

02-22 12:22:50.256: E/AndroidRuntime(384): at android.widget.LinearLayout.onMeasure(LinearLayout.java:309)

02-22 12:22:50.256: E/AndroidRuntime(384): at android.view.View.measure(View.java:8313)

02-22 12:22:50.256: E/AndroidRuntime(384): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)

02-22 12:22:50.256: E/AndroidRuntime(384): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)

02-22 12:22:50.256: E/AndroidRuntime(384): at android.view.View.measure(View.java:8313)

02-22 12:22:50.256: E/AndroidRuntime(384): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)

02-22 12:22:50.256: E/AndroidRuntime(384): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)

02-22 12:22:50.256: E/AndroidRuntime(384): at android.view.View.measure(View.java:8313)

02-22 12:22:50.256: E/AndroidRuntime(384): at android.view.ViewRoot.performTraversals(ViewRoot.java:839)

02-22 12:22:50.256: E/AndroidRuntime(384): at android.view.ViewRoot.handleMessage(ViewRoot.java:1859)

02-22 12:22:50.256: E/AndroidRuntime(384): at android.os.Handler.dispatchMessage(Handler.java:99)

02-22 12:22:50.256: E/AndroidRuntime(384): at android.os.Looper.loop(Looper.java:123)

02-22 12:22:50.256: E/AndroidRuntime(384): at android.app.ActivityThread.main(ActivityThread.java:3683)

02-22 12:22:50.256: E/AndroidRuntime(384): at java.lang.reflect.Method.invokeNative(Native Method)

02-22 12:22:50.256: E/AndroidRuntime(384): at java.lang.reflect.Method.invoke(Method.java:507)

02-22 12:22:50.256: E/AndroidRuntime(384): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)

02-22 12:22:50.256: E/AndroidRuntime(384): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)

02-22 12:22:50.256: E/AndroidRuntime(384): at dalvik.system.NativeStart.main(Native Method)

注意原因是java.lang.IndexOutOfBoundsException：index = 1 count = 0.這意味著頁/項的計數是0,我要求的索引是1.這兩個都不是真的.這是我打電話給我的ViewPager和請求給定的頁面：

ViewPager pager = (ViewPager) findViewById(R.id.ma_viewcontainer);

PAdapter adapter = new PAdapter();

pager.setAdapter(adapter);

pager.setCurrentItem(2);

請注意,此調用不會發生任何錯誤,并將當前項目正確設置為中間項目(索引1)：

ViewPager pager = (ViewPager) findViewById(R.id.ma_viewcontainer);

PAdapter adapter = new PAdapter();

pager.setAdapter(adapter);

pager.setCurrentItem(1);

我在視圖尋呼機中有3個項目的數量.這是我的完整的PAdapter類,它擴展了PagerAdapter類：

private class PAdapter extends PagerAdapter implements TitleProvider {

private int COUNT = 3;

private static final int SETTINGS_ACTIVITY = 0;

private static final int MAIN_ACTIVITY = 1;

private static final int FRIEND_LIST_ACTIVITY = 2;

@Override

public int getCount() {

return COUNT;

}

@Override

public Object instantiateItem(View collection, int position) {

LinearLayout layout = new LinearLayout(getApplicationContext());

LayoutInflater inflater = (LayoutInflater) getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);

switch(position) {

case MAIN_ACTIVITY :

layout = (LinearLayout) inflater.inflate(R.layout.main, null, false);

initMainLayout(layout);

break;

case SETTINGS_ACTIVITY :

layout = (LinearLayout) inflater.inflate(R.layout.settings, null, false);

initSettingsLayout(layout);

break;

case FRIEND_LIST_ACTIVITY :

layout = (LinearLayout) inflater.inflate(R.layout.friend_list, null, false);

initFriendListLayout(layout);

break;

}

((ViewPager)collection).addView(layout, position);

return layout;

}

@Override

public void destroyItem(View collection, int position, Object view) {

((ViewPager)collection).removeView((LinearLayout)view);

}

@Override

public boolean isViewFromObject(View v, Object o) {

return v == (LinearLayout)o;

}

@Override

public void finishUpdate(View arg0) {

//no need

}

@Override

public void restoreState(Parcelable arg0, ClassLoader arg1) {

//no need

}

@Override

public Parcelable saveState() {

return null;

}

@Override

public void startUpdate(View arg0) {

//no need

}

@Override

public String getTitle(int position) {

Resources res = getApplicationContext().getResources();

switch(position) {

case MAIN_ACTIVITY :

return res.getString(R.string.app_name);

case SETTINGS_ACTIVITY :

return res.getString(R.string.settings);

case FRIEND_LIST_ACTIVITY :

return res.getString(R.string.friend_list);

default :

return null;

}

}

}

行((ViewPager)集合).addView(layout,position);導致崩潰.

你可以看到,三個項目.使用參數為0或1的setCurrentItem()可以正常工作,但是2會導致這個奇怪的錯誤.我已經用盡了想法來解決它…不幸的是,ViewPager駐留在Android的一些未知的水域似乎.如果有人對如何解決這個問題有一些了解,那將是非常感激的.謝謝！

編輯：根據Shereef的建議,我嘗試通過collection.getChildCount()記錄子計數,得到以下結果：

02-22 15:20:42.274: E/children count(645): count: 0

02-22 15:20:42.454: E/children count(645): count: 1

02-22 15:20:42.594: E/children count(645): count: 2

這很有趣.這告訴我的是,它創建一個空的PagerAdapter,并一次添加一個.對于三個可見視圖(中心,左和右),instantiateItem()被調用3次.所以我在instantiateItem()方法中添加了這個代碼塊：

if(((ViewPager)collection).getChildCount() == 2) {

((ViewPager)collection).setCurrentItem(2);

}

所以只有計數確定為2,它會將頁面設置為2(這是一個很難解決的問題,但值得一試).我得到了一個類似的錯誤堆棧,首先指出：((ViewPager)集合).setCurrentItem(2);然后((ViewPager)集合).addView(layout,position);.

希望這有助于提供一些洞察力.

總結

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