调用notifyDataSetChange时,ViewPager会抛出NullPointerException。
我认为这是支持库中的一个错误,因为我的适配器不为空
堆栈追踪:
06-30 20:16:13.160 1578-1578/com.umeugwaDabeluchi.Ume E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.umeugwaDabeluchi.Ume, PID: 1578
java.lang.NullPointerException
at android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:1623)
at android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:637)
at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:166)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1235)
at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:666)
at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:628)
at android.support.v4.view.ViewPager.dataSetChanged(ViewPager.java:1077)
at android.support.v4.view.ViewPager$PagerObserver.onChanged(ViewPager.java:3060)
at android.support.v4.view.PagerAdapter.notifyDataSetChanged(PagerAdapter.java:284)
at com.umeugwaDabeluchi.Ume.Fragments.EditFile.OnFileReady(EditFile.java:62)
at com.umeugwaDabeluchi.Ume.Utility.DataManager$2.run(DataManager.java:204)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5635)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107)
at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分:0)
@Override
public void OnFileReady() {
adapter.notifyDataSetChanged();//throws nullPointer Exception
Log.i(TAG, "EditFile OnFileReady: ");
}
@Override
public void OnDataRemoved(int pos) {
adapter.notifyDataSetChanged();//throws nullPointer Exception
Log.i(TAG, "OnDataRemoved: " + "Page removed");
}
答案 1 :(得分:0)
开启你的开发者选项中不要保留活动吗? 如果为true,请参阅此https://testsmirk.com/2016/10/14/android-viewpager-bug/