5

I'm trying to switch Fragments using ViewPager + FragmentPagerAdapter. I'm currently using the latest Android support pack v4

I have 5 tabs in my app. When I select 4th tab, the app suddenly exits and says "can't change tag of fragment ~~".

I didn't try to replace the Fragment which is included in the layout xml file, so I couldn't figure out the cause.

Here is the code where the error occurs:

@Override
public void onTabSelected(ActionBar.Tab tab,
        FragmentTransaction fragmentTransaction) {
    // When the given tab is selected, switch to the corresponding page in
    // the ViewPager.
    mViewPager.setCurrentItem(tab.getPosition());
}

Below is fragment of FragmentPagerAdapter I'm using

@Override
    public Fragment getItem(int i) {
        if (fragment_list.get(i) == null) {
            fragment_list.add(i, getFragment(i));
        }

        return fragment_list.get(i);
    }

    private Fragment getFragment(int index) {
        switch (index) {
        case TOP:
            return UseCaseListWithOptionFragment.newInstance(
                    URLHelper.USE_CASES_TOP_URL, R.array.comment);
        case FEED:
            int user_id = UserHelper.getCurrentUser(MainActivity.this).id;
            return UseCaseListFragment.newInstance(
                    URLHelper.getMyFeedsURL(user_id), true);
        case RECENT:
            return UseCaseListFragment.newInstance(
                    URLHelper.USE_CASES_RECENT_URL, true);
        case CATEOGORY:
            return UseCaseGroupListFragment.newInstance(
                    URLHelper.USE_CASE_GROUPS_URL, R.array.use_case);
        case MY:
            return UserProfileFragment.newInstance(UserHelper
                    .getCurrentUser(MainActivity.this));
        default:
            throw new IllegalStateException("Tab index out of bound.");
        }
    }

    @Override
    public int getCount() {
        return TAB_COUNT;
    }

Below is the error log I encounter:

08-04 17:51:55.983: E/AndroidRuntime(1112): FATAL EXCEPTION: main
08-04 17:51:55.983: E/AndroidRuntime(1112): java.lang.IllegalStateException: Can't change tag of fragment UseCaseGroupListFragment{4055f558 id=0x7f050034 android:switcher:2131034164:3}: was android:switcher:2131034164:3 now android:switcher:2131034164:4
08-04 17:51:55.983: E/AndroidRuntime(1112):     at android.support.v4.app.BackStackRecord.doAddOp(BackStackRecord.java:356)
08-04 17:51:55.983: E/AndroidRuntime(1112):     at android.support.v4.app.BackStackRecord.add(BackStackRecord.java:347)
08-04 17:51:55.983: E/AndroidRuntime(1112):     at android.support.v4.app.FragmentPagerAdapter.instantiateItem(FragmentPagerAdapter.java:99)
08-04 17:51:55.983: E/AndroidRuntime(1112):     at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:692)
08-04 17:51:55.983: E/AndroidRuntime(1112):     at android.support.v4.view.ViewPager.populate(ViewPager.java:875)
08-04 17:51:55.983: E/AndroidRuntime(1112):     at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:469)
08-04 17:51:55.983: E/AndroidRuntime(1112):     at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:441)
08-04 17:51:55.983: E/AndroidRuntime(1112):     at android.support.v4.view.ViewPager.setCurrentItem(ViewPager.java:422)
08-04 17:51:55.983: E/AndroidRuntime(1112):     at org.everyuse.android.activity.MainActivity.onTabSelected(MainActivity.java:176)
08-04 17:51:55.983: E/AndroidRuntime(1112):     at com.actionbarsherlock.internal.app.ActionBarImpl.selectTab(ActionBarImpl.java:526)
08-04 17:51:55.983: E/AndroidRuntime(1112):     at com.actionbarsherlock.internal.app.ActionBarImpl$TabImpl.select(ActionBarImpl.java:907)
08-04 17:51:55.983: E/AndroidRuntime(1112):     at com.actionbarsherlock.internal.widget.ScrollingTabContainerView$TabClickListener.onClick(ScrollingTabContainerView.java:503)
08-04 17:51:55.983: E/AndroidRuntime(1112):     at android.view.View.performClick(View.java:2485)
08-04 17:51:55.983: E/AndroidRuntime(1112):     at android.view.View$PerformClick.run(View.java:9080)
08-04 17:51:55.983: E/AndroidRuntime(1112):     at android.os.Handler.handleCallback(Handler.java:587)
08-04 17:51:55.983: E/AndroidRuntime(1112):     at android.os.Handler.dispatchMessage(Handler.java:92)
08-04 17:51:55.983: E/AndroidRuntime(1112):     at android.os.Looper.loop(Looper.java:123)
08-04 17:51:55.983: E/AndroidRuntime(1112):     at android.app.ActivityThread.main(ActivityThread.java:3683)
08-04 17:51:55.983: E/AndroidRuntime(1112):     at java.lang.reflect.Method.invokeNative(Native Method)
08-04 17:51:55.983: E/AndroidRuntime(1112):     at java.lang.reflect.Method.invoke(Method.java:507)
08-04 17:51:55.983: E/AndroidRuntime(1112):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
08-04 17:51:55.983: E/AndroidRuntime(1112):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
08-04 17:51:55.983: E/AndroidRuntime(1112):     at dalvik.system.NativeStart.main(Native Method)

Thanks in advance...

4

2 に答える 2

4

getCountメソッドを誤って実装したときに、同じ例外が発生しました。正しいサイズが返されるかどうかを確認しましたか？

@Override
public int getCount() {
    return 5;
}
于 2012-12-31T13:29:17.887 に答える
1

この質問をしてからしばらく経っているようですが、この問題に直面する可能性のある将来のユーザーのために...

一部のデバイスでまったく同じエラーが発生していましたが、@mkasberg のコメントを見るまで理由を見つけることができませんでした...何らかの理由で getItem メソッドが順番どおりに呼び出されない可能性があります。しかし、arrayList の代わりに sparseArray を使用すると、問題が解決しました。ありがとう！

そして、ここであなたがそれを行う方法：

public Fragment getItem(int i) {
    if (sparseArray.get(i) == null) {
        sparseArray.put(i, getFragment(i));
    }

    return sparseArray.get(i);
}
于 2014-02-13T08:35:53.183 に答える