小编Ant*_*ray的帖子

这是我目前面临的问题.我最近已经从带有ADT插件的Eclipse切换到Android Studio,并且在Eclipse工作室中出现了我从未遇到过的错误.

当我切换到一个名为"LineFragment"的特定片段时,我收到以下错误:

java.lang.NullPointerException: Attempt to write to field 'int android.support.v4.app.Fragment.mNextAnim' on a null object reference
        at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:708)
        at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1489)
        at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:486)
        at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
        at android.support.v4.view.ViewPager.populate(ViewPager.java:1073)
        at android.support.v4.view.ViewPager.populate(ViewPager.java:919)
        at android.support.v4.view.ViewPager$3.run(ViewPager.java:249)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
        at android.view.Choreographer.doCallbacks(Choreographer.java:580)
        at android.view.Choreographer.doFrame(Choreographer.java:549)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
        at android.os.Handler.handleCallback(Handler.java:739)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:135)
        at android.app.ActivityThread.main(ActivityThread.java:5221)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)

它似乎与片段为null或左右有关.我在互联网上搜索,但只有极少数人喜欢这样的东西.

这是我的片段的代码(它像所有3个片段一样扩展android.support.v4.app.Fragment)

public class LineFragment extends Fragment{

private View v;
private ListView list;
private LineList listAdapter;
private Home home;  // Current activity

public static LineFragment  newInstance(String chaine) …